Folding manual steel-frame wheelchair manufacturing

1. Scope and Applicability

Manufacture of a new complete adult manual wheelchair with folding cross-brace welded steel-tube frame, powder-coated finish where applied, handrim rear wheels with solid polyurethane tyres, front casters and separately supplied seat/back slings, arm supports, swing-away footrests and mechanical parking wheel locks. Actual released tube cutting/bending/jigging/joining, conditional cleaning/powder/electric cure, component mounting/adjustment and configured factory acceptance form the foreground. Actual stock grade, joints, supplier module contents and complete installed accessories define this route, not a universal chair design or material recipe.

Exclude powered or power-assisted chairs/batteries/motors, attendant-only small-wheel transport chairs without handrims, rigid/sports/carbon/titanium/aluminium-frame chairs, pneumatic-tyre routes, reclining/standing or complex custom seating systems, repair/refurbishment and complete-frame assembly-only manufacture. Brazed-only frame route is outside this welded-frame boundary. Exclude clinical assessment/prescription/fitting, personal mobility service, occupied distance, user/attendant energy, use-phase maintenance and end of life. Bounded factory adjustment/inspection/type or sample tests belong to manufacturing when attributable; this foreground is not a complete cradle-to-gate or clinical-outcome/lifetime service model.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.transport-equipment.wheelchair
classification_refs	CPC:3.0:49922; narrower
covered_products	Manufacture of a new complete adult manual wheelchair with folding cross-brace welded steel-tube frame, powder-coated finish where applied, handrim rear wheels with solid polyurethane tyres, front casters and separately supplied seat/back slings, arm supports, swing-away footrests and mechanical parking wheel locks. Actual released tube cutting/bending/jigging/joining, conditional cleaning/powder/electric cure, component mounting/adjustment and configured factory acceptance form the foreground. Actual stock grade, joints, supplier module contents and complete installed accessories define this route, not a universal chair design or material recipe.
excluded_products	Exclude powered or power-assisted chairs/batteries/motors, attendant-only small-wheel transport chairs without handrims, rigid/sports/carbon/titanium/aluminium-frame chairs, pneumatic-tyre routes, reclining/standing or complex custom seating systems, repair/refurbishment and complete-frame assembly-only manufacture. Brazed-only frame route is outside this welded-frame boundary. Exclude clinical assessment/prescription/fitting, personal mobility service, occupied distance, user/attendant energy, use-phase maintenance and end of life. Bounded factory adjustment/inspection/type or sample tests belong to manufacturing when attributable; this foreground is not a complete cradle-to-gate or clinical-outcome/lifetime service model.
representative_product	One complete accepted adult folding handrim manual wheelchair with welded steel frame, configured solid-polyurethane/composite wheel packages and specified seat/back/support/parking-lock fit-list. Drive SilverSport2 is a configuration illustration, not a compulsory model, clinical prescription or confirmation of its factory joint recipe.
production_route	Steel frame and folding-member fabrication; Frame surface preparation and powder finishing; Wheel, seating, support and folding-interface assembly; Configured mechanical acceptance, weighing and dispatch
market_state	Complete accepted operationally assembled chair with installed declared wheels/seat/back/arms/footrests/locks/accessories. Folding or removable supports for transport do not change the complete configuration; weigh after complete reassembly. User, test masses, packaging and detached accessories excluded from net M.

3. Reference Flow

Field	Value
What	Manufacture and acceptance of the complete declared folding manual wheelchair, with configuration-specific mechanical function and supplied state.
How much	1kg accepted net manufacturing output from actual measured M kg per one complete accepted same-configuration wheelchair.
How well	Actual released drawings/supplier fit-list, current applicable contract/conformity and recorded joint/fold/retention/wheel/parking-lock/seating/support acceptance. No clinical fit or universal patient rating inferred.
How long or cycle	One recorded manufacture/acceptance cycle, not a specified life or occupied-mobility service.
reference_flow_link	finished_machine

Field	Value
Reference amount	1
Reference product flow	Complete folding manual steel-frame wheelchair
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	model/released drawing revision/serial; adult manual handrim/folding cross-brace architecture; seat width/depth/back and arm/footrest actual variant; frame tube/sheet grade/geometry/joint and finish; wheel/solid tyre/handrim/caster/fork/axle/lock/bearing specification and supplier contents; upholstery actual fabric/coating/seam/attachment; installed supports and accessories/cushion/anti-tip/belt inclusion; site/period/accepted count/rework and inspection/type/sample test basis; current applicable contract and configuration-specific conformity/acceptance; original complete calibrated weighing/tare/net state and independent installed component mass; net M kg excludes user/test masses/packaging/detached parts, differs from catalogue weight/load rating; upstream stock/component/utility/transport/treatment gaps

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_mass	reference product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	M = accepted net mass of one complete unit of the same configuration in kg; collect using cp_mass.
electricity_energy	frame_power; coat_power; assembly_power; test_power	Energy 93a60a56-a3c8-11da-a746-0800200c9a66	MJ	Meter actual kWh and multiply by3.6MJ/kWh. No rated equipment power times presumed duty cycle.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Received identified circular welded steel tube and conditional sheet/filler/gas plus supplied wheel/seating/support modules and actual utilities at manufacturer; local frame manufacture, conditional finishing, assembly and acceptance to dispatch. No extracted ores or constituent synthesis assumed local.
starting_condition_role	foreground_start
product_classification_scope	CPC3.0:49922; narrower manual folding steel-frame route
recursive_input_rule	A received complete chair is not raw material. Bought complete coated frame assembly-only route lies outside this local-frame manufacturing boundary. Purchased complete wheel/support modules contain documented stocks/processes; do not also charge their contained resin/tyre/bearing/paint.
upstream_dataset_requirement	Actual compatible stock, chemical, supplied finished wheel/seat/support, utility, transport and treatment modules with grade/property/package/chemistry/supply condition disclosed before extending beyond foreground.
disclosure	Site/period, make-or-buy and supplied contents, actual drawing/assembly/test scope, rework/type/sample attribution, exclusions and missing upstream/support/treatment coverage. No default full cradle-to-gate label.

rule_id	applies_to	rule	source_ids
boundary_modules	assembly	Each complete wheel/caster/lock/support package has independently measured installed supplied kg and declared tyre/bearing/handrim/axle/pad/footplate contents. One exact part/configuration per card; physically different left/right parts need distinct records. Local raw wheel/plastic/seat manufacture requires actual atomically expanded stock/process records, not inherited generic module.	intco-components
boundary_tests	acceptance	Include attributable manufacturing setup, joint/fold/lock/rotation/clearance inspection and actual type/sample/production tests with support energy and actual destructive rejects. Distinguish sampled burden allocation from per-unit inspection; no imported fatigue-cycle factor or patient mass input.
boundary_delivery	finished_machine	One complete as-accepted configured chair after installed footrests/arms/seat/wheels and documented accessories are reconciled; transport folding/removal recorded and reassembled before net weighing. Detached cushions/spares, user/test masses and transport packaging outside M. Retained bearing grease contained once.
boundary_finish	coat	Coating only where actually applied locally, specific supplied powder/SDS/issue-return-reclaim/cure demand. Powder coating does not itself imply solvent-VOC emission; every actual cleaner, wastewater and gas-fuel/heat exchange independently added if present.	drive-silversport

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
frame	Steel frame and folding-member fabrication	required	Actual side-frame/cross-brace tube cutting/bending/jigging/welding and conditional bracket fabrication to released drawings; joint and alignment inspection. No bought complete frame also charged.	foreground_manufacturing	1kg accepted output; conditional exchanges only where actually used
coat	Frame surface preparation and powder finishing	conditional	Only actual additional preparation/powder/electric cure/rework, with exact supplied formulation and metering. Supplier-finished components contain their upstream coating.	foreground_manufacturing	1kg accepted output; conditional exchanges only where actually used
assembly	Wheel, seating, support and folding-interface assembly	required	Mount actual supplied wheel/caster/handrim/lock/seat/back/arm/footrest packages; folding pivots, axle/retention, alignment/clearance, specified screw torque and adjustments recorded for the complete approved configuration.	foreground_manufacturing	1kg accepted output; conditional exchanges only where actually used
acceptance	Configured mechanical acceptance, weighing and dispatch	required	Actual fold/unfold and retention, wheel/caster free rotation/tracking, footrest/arm/lock function, seating attachment and finish inspection; attributable type/sample tests and rework; complete net weighing.	foreground_manufacturing	1kg accepted output; conditional exchanges only where actually used

Process: Steel frame and folding-member fabrication (frame)

Actual side-frame/cross-brace tube cutting/bending/jigging/welding and conditional bracket fabrication to released drawings; joint and alignment inspection. No bought complete frame also charged.

Inputs

Product flows

Steel Pipe (steel_tube)

Actual circular welded non-stainless steel tube, recorded grade/heat/diameter/wall and measured stock issues/returns. Released drawings determine side-frame and locally fabricated cross-brace cuts/bends/joints.

• Selected flow: Steel Pipe 370d14a6-55f3-4fdd-90b2-84751125ff00
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_frame.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_frame
• Sources:

Cold-rolled low-carbon steel wheelchair axle-bracket sheet (bracket_sheet)

Conditional actual cut/formed bracket sheet grade/thickness. Supplier-complete bracket replaces contained sheet and work, not both charged.

• Selected flow: Cold-rolled low-carbon steel wheelchair axle-bracket sheet
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_frame.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_frame
• Sources:

Solid carbon-steel welding filler wire (weld_wire)

Only actual qualified joining procedure consuming this exact filler chemistry/diameter; autogenous joining does not charge it. Brazing filler has a separate identity, not this wire.

• Selected flow: Solid carbon-steel welding filler wire
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_frame.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_frame
• Sources:

Pure argon welding shielding gas (shield_argon)

Conditional actual joining procedure uses pure argon CAS7440-37-1 and metered kg or physically documented state-specific volume-to-kg conversion; mixed gas separate.

• Selected flow: Pure argon welding shielding gas
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_frame.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_frame
• Sources:

Alternating current (frame_power)

Actual below1kV grid-user cutting/forming/joining/jigging/extraction demand, including attributable compressed-air generation once; no rated power assumption.

• Selected flow: Alternating current 50657322-939c-4829-a87b-47c093bfa6a7
• Flow property / unit: Energy 93a60a56-a3c8-11da-a746-0800200c9a66 / MJ
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_frame.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_frame
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Post-industrial steel scrap (steel_scrap)

Only actually separated dry untreated non-stainless tube/sheet offcuts to declared treatment, no same internal recycle double counted.

• Selected flow: Post-industrial steel scrap c143745d-be4f-4d8f-b403-2dcbfe685349
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_frame.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_frame
• Sources:

Elementary flows

Particulate matter, particle size unspecified (particle_air)

Only actual post-control cutting/joining/grinding particle release to immediate unspecified air with sampling and exhaust/time originals. Captured dust is waste; measured size fractions separate.

• Selected flow: Particulate matter, particle size unspecified 0ce3dedb-caca-407b-a856-a90470eb8ec0
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_frame.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_frame
• Sources:

Process: Frame surface preparation and powder finishing (coat)

Only actual additional preparation/powder/electric cure/rework, with exact supplied formulation and metering. Supplier-finished components contain their upstream coating.

Inputs

Product flows

Powder Coating (coating_powder)

Conditional actual one supplied dry polymer-resin/additive powder formulation with SDS, chemistry, colour, issued/returned/reclaimed kg and retained film. Public material identity does not establish specific resin or cure recipe.

• Selected flow: Powder Coating 6e3010f9-fbd3-48f6-95fc-c1b38d2800d2
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_coat.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_coat
• Sources:

Tap water (coat_water)

Actual purchased municipal product cleaning makeup kg where used. Recycle transfer, cleaner chemical, abstraction and outgoing wastewater separately identified.

• Selected flow: Tap water d1e0e36c-07f0-4a75-bdcb-efb5d9e2ac36
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_coat.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_coat
• Sources:

Alternating current (coat_power)

Actual below1kV preparation/powder spraying/electric curing/extraction and rework demand; separately identify actual thermal fuel/heat if this electric configuration changes.

• Selected flow: Alternating current 50657322-939c-4829-a87b-47c093bfa6a7
• Flow property / unit: Energy 93a60a56-a3c8-11da-a746-0800200c9a66 / MJ
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_coat.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_coat
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Unusable dry polymer powder-coating residue (powder_residue)

Only actual segregated unusable dry powder sent to treatment after measured reclaim/return, no captured dust counted as air and waste simultaneously.

• Selected flow: Unusable dry polymer powder-coating residue
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_coat.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_coat
• Sources:

Elementary flows

Particulate matter, particle size unspecified (powder_particle_air)

Only actual measured powder-extraction post-control release to immediate unspecified air, particle size unspecified. No assumed solvent-VOC or inevitable powder loss.

• Selected flow: Particulate matter, particle size unspecified 0ce3dedb-caca-407b-a856-a90470eb8ec0
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_coat.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_coat
• Sources:

Process: Wheel, seating, support and folding-interface assembly (assembly)

Mount actual supplied wheel/caster/handrim/lock/seat/back/arm/footrest packages; folding pivots, axle/retention, alignment/clearance, specified screw torque and adjustments recorded for the complete approved configuration.

Inputs

Product flows

Finished composite wheelchair rear wheel with solid polyurethane tyre and handrim (rear_wheel)

One actual model/side wheel package kg with declared tyre/handrim/hub/bearing/axle contents. Distinct sides or sizes separate; contained tyre and bearing not added again.

• Selected flow: Finished composite wheelchair rear wheel with solid polyurethane tyre and handrim
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Finished wheelchair front caster and fork assembly (front_caster)

One actual caster/fork/stem/bearing/solid-tyre package kg, trail/clearance/retention specified; different caster types separate and contained bearing not double counted.

• Selected flow: Finished wheelchair front caster and fork assembly
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Brake assembly (wheel_lock)

One actual supplied mechanical push-to-lock wheelchair parking wheel-lock module kg and side/model/configuration. Public purchased wheelchair-brake identity qualified to this module; not dynamic service brake, caster or whole chair.

• Selected flow: Brake assembly 5e18162c-b48d-4476-b7f9-23884748e7f7
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Finished vinyl-coated textile wheelchair seat sling (seat_sling)

One actual supplied seat sling kg and fabric/coating/edge-seam/attachment specification. Vinyl is not automatically a single PVC resin purity; supplier actual composition required.

• Selected flow: Finished vinyl-coated textile wheelchair seat sling
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Finished vinyl-coated textile wheelchair backrest sling (back_sling)

Actual separate supplied backrest model kg, attachment and pocket content declared. Do not merge with seat or infer clinical pressure-relief function.

• Selected flow: Finished vinyl-coated textile wheelchair backrest sling
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Finished swing-away wheelchair footrest with plastic footplate (footrest)

Actual one supplied footrest/heel-loop/hanger package kg, side and locking/adjustment interface; elevating/other types need separate physical cards.

• Selected flow: Finished swing-away wheelchair footrest with plastic footplate
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Finished padded wheelchair armrest assembly (armrest)

One actual arm model kg with pad/support/side-panel and attachment scope, fixed/detachable actual variant not interchangeable; left/right different types separate.

• Selected flow: Finished padded wheelchair armrest assembly
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Finished moulded elastomer wheelchair push-handle grip (grip)

Actual one supplied grip model/elastomer composition kg and retention method; other polymer/composition or handle tube separate.

• Selected flow: Finished moulded elastomer wheelchair push-handle grip
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Steel screw (steel_screw)

One actual screw material/thread/length/coating specification, independently supplied kg and count trace. Other bolt/nut/washer/pin designs get separate cards; not fastener pool.

• Selected flow: Steel screw 895204f6-6425-4814-afc5-cb97e530e892
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Finished steel wheelchair cross-brace pivot pin (pivot_pin)

One actual supplied pin grade/diameter/retention kg, not whole cross-brace. Locally fabricated cross-brace stock belongs frame and is not also purchased finished module.

• Selected flow: Finished steel wheelchair cross-brace pivot pin
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Alternating current (assembly_power)

Actual below1kV component mounting/torque/adjustment and inspection equipment demand; human propulsion has no purchased propulsion-electricity row.

• Selected flow: Alternating current 50657322-939c-4829-a87b-47c093bfa6a7
• Flow property / unit: Energy 93a60a56-a3c8-11da-a746-0800200c9a66 / MJ
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_assembly.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_assembly
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Elementary flows

Process: Configured mechanical acceptance, weighing and dispatch (acceptance)

Actual fold/unfold and retention, wheel/caster free rotation/tracking, footrest/arm/lock function, seating attachment and finish inspection; attributable type/sample tests and rework; complete net weighing.

Inputs

Product flows

Alternating current (test_power)

Actual below1kV production inspection/weighing and attributable type/sample testing equipment energy, with allocation to correct production and rejects.

• Selected flow: Alternating current 50657322-939c-4829-a87b-47c093bfa6a7
• Flow property / unit: Energy 93a60a56-a3c8-11da-a746-0800200c9a66 / MJ
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_acceptance.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_acceptance
• Sources:

Low-density polyethylene foil (PE-LD) (film)

Conditional actual noncellular nonadhesive protective film kg outside M. Cardboard/loose cushion/transport fixtures separately identified where present.

• Selected flow: Low-density polyethylene foil (PE-LD) 2cecd3a7-d90e-44b4-aec5-1d9dfb907477
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: Apply normalize_mass to q_item; reference_mass; cp_acceptance.
• Value mode: foreground_record
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow; collected per one accepted finished unit
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_acceptance
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Complete folding manual steel-frame wheelchair (finished_machine)

1kg of complete declared accepted configured manual wheelchair including installed rear wheels/casters/seat/back/arms/footrests/locks and declared accessories once; actual measured net M, not catalogue weight or patient load.

• Selected flow: Complete folding manual steel-frame wheelchair
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg
• Amount rule: 1 kg
• Value mode: fixed_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: collected_record
• Collection protocol: cp_mass
• Sources:

Waste flows

Elementary flows

7. Allocation and Co-product Handling

rule_id	applies_to	rule	source_ids
allocation_direct	all processes	Prefer actual drawing/configuration work orders and stock/meter attribution. Match accepted complete chair count to the same manufacturing period; include actual rejects/rework/destructive test burden. Do not divide by sales, mixed configurations or assumed universal batch yield.
allocation_shared	shared operations	First separate operations. If inseparable, actual causal machine occupancy/joint work, coated surface/cure occupancy and inspection/test equipment demand determine documented drivers. Reconcile shared meter totals and compare plausible alternatives; fixed inspection burden is not automatically proportional to chair mass.
allocation_scrap	waste	Separate internal recycle, outgoing scrap/powder waste, treatment and genuine co-products. No automatic avoided virgin steel/paint credit. Economic allocation only for documented genuine co-products when causal physical basis unavailable, with actual price period and sensitivity.

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_mass	acceptance	accepted complete output	measurement	model; configuration; serial number; accepted net mass M	Use traceable weighing records for the accepted complete unit of the same configuration.	kg	every accepted wheelchair	matched manufacture/acceptance period	actual complete weighing/acceptance station	accepted net mass per unit	calibrated all-wheel platform readings/tare; complete installed accessories and no operator/test masses/packaging; independent component mass
cp_frame	frame	independent atomic exchanges	foreground_record	tube/sheet grade/heat/dimensions and issued-returned kg; drawing/joint procedure/jig orders; actual filler/gas if used; kWh; dry scrap; post-control species sampling	Record each actual exchange separately by identified supplier issue/return and independently weighed installed kg, calibrated utility meters or actual post-control species sampling/exhaust/time. Record model/drawing/configuration, work orders, stock/rework, same-configuration accepted count and waste destination.	kg; MJ	per batch/unit/test and full period	same configuration manufacture and acceptance cycle	actual manufacturing/test sites and declared subcontractors	attributable process exchange / accepted units	supplier formulation/fit-list, calibration/sampling uncertainty, issue-return-stock and count closure
cp_coat	coat	independent atomic exchanges	foreground_record	actual formulation/SDS and treated surface; powder issue/return/reclaim/retained film; cleaning water/chemicals; cure/extraction meters and segregated residues	Record each actual exchange separately by identified supplier issue/return and independently weighed installed kg, calibrated utility meters or actual post-control species sampling/exhaust/time. Record model/drawing/configuration, work orders, stock/rework, same-configuration accepted count and waste destination.	kg; MJ	per batch/unit/test and full period	same configuration manufacture and acceptance cycle	actual manufacturing/test sites and declared subcontractors	attributable process exchange / accepted units	supplier formulation/fit-list, calibration/sampling uncertainty, issue-return-stock and count closure
cp_assembly	assembly	independent atomic exchanges	foreground_record	actual wheel/caster/tyre/handrim/axle/lock and seat/back/support fit-list; supplier package contents; installed independent kg; pivot/fastener/retention and alignment/clearance/torque checks	Record each actual exchange separately by identified supplier issue/return and independently weighed installed kg, calibrated utility meters or actual post-control species sampling/exhaust/time. Record model/drawing/configuration, work orders, stock/rework, same-configuration accepted count and waste destination.	kg; MJ	per batch/unit/test and full period	same configuration manufacture and acceptance cycle	actual manufacturing/test sites and declared subcontractors	attributable process exchange / accepted units	supplier formulation/fit-list, calibration/sampling uncertainty, issue-return-stock and count closure
cp_acceptance	acceptance	independent atomic exchanges	foreground_record	serial/configuration; released acceptance/type/sample plan/results/period/accepted/rejected count; test equipment meters; calibrated complete weighing/tare/accessory/temporary test mass and independent installed BOM	Record each actual exchange separately by identified supplier issue/return and independently weighed installed kg, calibrated utility meters or actual post-control species sampling/exhaust/time. Record model/drawing/configuration, work orders, stock/rework, same-configuration accepted count and waste destination.	kg; MJ	per batch/unit/test and full period	same configuration manufacture and acceptance cycle	actual manufacturing/test sites and declared subcontractors	attributable process exchange / accepted units	supplier formulation/fit-list, calibration/sampling uncertainty, issue-return-stock and count closure

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
normalize_mass	steel_tube; bracket_sheet; weld_wire; shield_argon; frame_power; steel_scrap; particle_air; coating_powder; coat_water; coat_power; powder_residue; powder_particle_air; rear_wheel; front_caster; wheel_lock; seat_sling; back_sling; footrest; armrest; grip; steel_screw; pivot_pin; assembly_power; test_power; film	q_ref = q_item / M; q_item = exchange amount per one accepted finished unit; q_ref = exchange amount per 1 kg reference flow.	q_item; M; cp_mass	q_ref

q_item is actual attributed exchange after measured issue/return/stock/reclaim and rework divided by matched same-configuration accepted count; M independently measured for the same complete installed state. Preserve kg or MJ numerator (electricity MJ/kg). Screw/module q_item is actually supplied installed kg, with counts supplementary for traceability. Other count/area/volume conversions require original same-part mass/geometry/state and uncertainty; no catalogue chair weight, rated user load, design density or hypothetical25% parts share.

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
quality_weighing	finished_machine	Weigh the complete accepted same-configuration chair on a calibrated platform supporting all wheels, with controlled tare and no operator, support handle/fixture or added test load. Retain serial/configuration, original readings, instrument/calibration, date, repeats and uncertainty. Independent installed frame, cross-brace, wheel/caster, seating/support/lock/fastener/accessory masses reconcile M; missing physical originals prevent dataset use.	original complete weighing and independent component records
quality_complete	finished_machine	Declare exact installed arm/footrest/seat/back/wheel and accessory configuration, including installed cushion/belt/anti-tip devices when supplied as part of the reference. Reassemble detached delivery supports before weighing; detached spares/cushions and packaging outside M. Retained bearing grease contained once. Catalogue folded/unfolded dimensions, brochure41lb or transport shipping weight cannot replace current complete M.	actual released installed fit-list and signed weighing state
quality_identity	all flows	One exact stock grade/formulation/part/medium per exchange. A frame-only or brake identity cannot represent complete wheelchair, even if Mass/kg agrees. Adopted purchased wheelchair brake is qualified to actual mechanical parking lock, not dynamic brake. Supplied powder is one identified dry formulation, not a coating service; powder-waste Aluminium-content property not total waste Mass. Actual public property retained; conversions need original evidence.	direct public identity/property and actual supplier drawings/SDS
quality_architecture	frame; assembly	Trace actual welded steel tube/joint procedure and folding cross-brace/pivots to released drawings. Verify folding retention, axle/caster/handrim compatibility and clearances, seat/back attachment, footrest/arm locking and parking-lock alignment. Material name, cross-brace count or a standard citation alone does not prove strength or clinical fit. RESNA2004 brazed prototype is counterevidence to treating all steel chairs as one weld recipe.	intco-components; resna-india-2004; actual released drawings
quality_acceptance	acceptance	Retain current applicable model/configuration conformity and factory inspection/test plans/results for joint/frame alignment, fold/pivot/retention, wheel/caster rotation/tracking, parking-lock holding/function, seating/arm/footrest attachment and finish. Type/sample/destructive tests need actual tested configuration, method/edition/laboratory/result, sampled count/period, support demand and reject attribution. No ISO threshold/cycle number/patient load or universal lifetime copied from source; actual contractual requirements independently evidenced.	intco-components; actual released inspection/test plans
quality_release	elementary	Only actual evidenced post-control particulate release, immediate air/unspecified size with concentration/exhaust/time or directly measured mass. Captured powder/dust goes to waste, not air. Expand actual size-resolved particles or chemical species with distinct compatible identities if found; powder coating does not justify assumed solvent VOC, and upstream electricity emissions are not direct factory emissions.	original post-control sampling and measured waste balances
quality_coverage	dataset	Reconcile every installed drawing/fit-list item with supplier/stock/meter totals. Add actual different rear wheels/casters, bearings/axles/handrims, grips, arm pads, heel loops, cross-brace bushings, pins/bolts/nuts/washers, labels, optional anti-tip/belt/cushion and actual coating cleaners/wastewater/carton whenever not contained. Each physical/chemical exchange one card/protocol and quantity basis; no generic wheelchair-parts pool. Identify measured/calculated/estimated/missing/excluded/not-applicable status and uncertainty; disclose upstream stock/module/support/transport/treatment gaps.	complete actual fit-list, independently closed stocks/meters

9. Validation Rules

rule_id	applies_to	rule	source_ids
validation_reference	finished_machine	Exactly1kg complete accepted declared manual chair; reference name equals finished_machine name. Blank product UUID permitted only with precise candidate identity gap. cp_mass actual M and independent complete configuration/installed mass reconciliation required; formula pass does not approve physical data or methodology.
validation_basis	inventory	Every row links supported lowercase IDs/protocols and normalize_mass. Verify same-configuration actual accepted count, period and numerator unit; reject mixed configurations, invalid enums, Mass/Energy/content/count substitution and catalogue conversions.
validation_scope	dataset	Require actual manual handrim/solid-tyre folding welded-steel architecture, declared make-or-buy local fabrication, mechanical acceptance and identity/upstream gaps. Clinical fit, mobility outcomes and cradle-to-gate completeness cannot be inferred from this foreground.
validation_release	elementary	Verify actual immediate-air particle state/medium and conditional quantity. Purchased tap water product, outgoing wastewater/waste dust treatment, resource abstraction and direct emission remain separate.

10. Published Dataset Profile

Field	Value
dataset_role	foreground_manufacturing_module
downstream_use	secondary_dataset; background_dataset
allowed_use	Manufacture of a new complete adult manual wheelchair with folding cross-brace welded steel-tube frame, powder-coated finish where applied, handrim rear wheels with solid polyurethane tyres, front casters and separately supplied seat/back slings, arm supports, swing-away footrests and mechanical parking wheel locks. Actual released tube cutting/bending/jigging/joining, conditional cleaning/powder/electric cure, component mounting/adjustment and configured factory acceptance form the foreground. Actual stock grade, joints, supplier module contents and complete installed accessories define this route, not a universal chair design or material recipe.
excluded_use	Exclude powered or power-assisted chairs/batteries/motors, attendant-only small-wheel transport chairs without handrims, rigid/sports/carbon/titanium/aluminium-frame chairs, pneumatic-tyre routes, reclining/standing or complex custom seating systems, repair/refurbishment and complete-frame assembly-only manufacture. Brazed-only frame route is outside this welded-frame boundary. Exclude clinical assessment/prescription/fitting, personal mobility service, occupied distance, user/attendant energy, use-phase maintenance and end of life. Bounded factory adjustment/inspection/type or sample tests belong to manufacturing when attributable; this foreground is not a complete cradle-to-gate or clinical-outcome/lifetime service model.
required_metadata	model/released drawing revision/serial; adult manual handrim/folding cross-brace architecture; seat width/depth/back and arm/footrest actual variant; frame tube/sheet grade/geometry/joint and finish; wheel/solid tyre/handrim/caster/fork/axle/lock/bearing specification and supplier contents; upholstery actual fabric/coating/seam/attachment; installed supports and accessories/cushion/anti-tip/belt inclusion; site/period/accepted count/rework and inspection/type/sample test basis; current applicable contract and configuration-specific conformity/acceptance; original complete calibrated weighing/tare/net state and independent installed component mass; net M kg excludes user/test masses/packaging/detached parts, differs from catalogue weight/load rating; upstream stock/component/utility/transport/treatment gaps
required_quality_disclosure	Exact chair drawing/installed configuration and supplied-package state; actual complete M/calibration/tare/independent component mass/uncertainty; actual stock/meter/test periods and accepted/rejected counts; type/sample/inspection attribution and causal shared allocation sensitivity; missing physical records/identities and upstream/support/treatment scope; scientific review pending.
update_trigger	Frame grade/joint/folding mechanism/finish, wheel/caster/lock or seating/support configuration, supplier/make-or-buy/site/period, test scope, weighing/delivery state and new identities/evidence.

11. Data Sources

Source id	Type	Reference	Used for
drive-silversport	handbook	Drive Medical, SilverSport2 SSP218FA-SF official product page, undated, About This Item steel frame/vinyl/solid polyurethane-composite wheels/supports/wheel locks and configuration options; unpaginated. https://shop.drivemedical.com/us/en/products/mobility/wheelchairs/standard-wheelchairs/silver-sport-2-wheelchair/p/SSP218FA-SF	Specific finished configuration illustration only; no current clinical conformity, compulsory model/recipe,41lb net M, rated load, warranty life or factory quantity adopted. Actual supplier composition/complete installed weighing and released drawings govern.
intco-components	handbook	INTCO, Manual Wheelchair Anatomy and Components, site date3September2026; Frame and cross-brace / Wheels, casters... / Seating, backrest... / Brakes, locks...; unpaginated. https://www.intcowheelchair.com/news/manual-wheelchair-structure-and-components	Component interfaces, exact configuration/fit-list, join/fold/retention/lock and supplier inspection/control context. Does not prove specific compliance or clinical suitability. Listed ISO numbers not adopted as numeric rules/current legal requirements; actual applicable contract/test originals required.
resna-india-2004	literature	RESNA2004 original proceedings, Design and development of a manual wheelchair for India, DESIGN and DEVELOPMENT, unpaginated HTML. https://www.resna.org/sites/default/files/legacy/conference/proceedings/2004/Papers/StudentScientific/Winners/Wheelchair.html	Historical folding steel-tube/flat-stock manufacturing and component-quality illustration only; separates welded description from brazed prototype. No1020grade,2mmthickness, prototype mass, fatigue cycles, life, universal joint process or present standard compliance inferred.