chair
Let an agent describe chairs by type, dimensions, materials and safety, and treat wheelchairs as assistive devices with their own regulation.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent describe chairs by type, dimensions, materials and safety, and treat wheelchairs as assistive devices with their own regulation.
A piece of furniture for one person to sit on, with a seat, a back and usually four legs; the class also covers wheelchairs and other seating devices.
What it is for: Seating one person, for work, rest, dining or mobility.
It can be sit on it; adjust it, where it is adjustable; buy, repair or recycle it; prescribe it, in the case of wheelchairs and special seating.
Distinguishing features
For one person, with a backrest
Wheelchairs are medical devices with their own standards
Ergonomics matter for chairs used for long periods
The academic chair is a different entry
What it looks like
A seat raised on legs or a base, with a backrest and sometimes armrests; wheelchairs add wheels and push rims.
Physical character
seat height: 400-480 mm - dining and office chairs
seat width: 400-500 mm
load rating: 100-150+ kg - bariatric chairs higher
How it is recognised
A seat for one with a backrest, unlike a stool or bench
Wheels and push rims or motors for wheelchairs
Office chairs have a swivel base and adjustments
Related models
is a kind of - seating furniture
has kind - an assistive seating device
is confused with - a homonym
is confused with - no backrest or for several people
In practice
Families and kinds
dining, office, armchair, folding, high chair for infants
wheelchairs: manual, powered, sports
mobility scooters as related devices
design classics and public seating
Standards and regulation
EN 1022 and EN 12520 domestic seating safety
EN 1335 office chairs
ISO 7176 wheelchair standards and medical device regulation
EN 14988 children high chairs
Failure modes and hazards
Tipping and collapse
Finger traps in folding chairs
Poor ergonomics causing back pain
Wheelchair failures leaving users stranded
Also called
+180
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.chair
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Design Type and form.
Type decides use and standards.
Type
Dining, office, wheelchair.
Chair type
The type and intended use.
- What type of chair is this, and what is it for? definition
- Which standard applies to that type? provenance
Dimensions
Seat height, width, depth.
Dimensions
Key dimensions.
- What are its seat height, width and depth? measurement
- Is it adjustable? definition
Materials and strength What it is made of and what it holds.
Strength and materials decide safety and life.
Materials
Frame and upholstery.
Materials
The materials used.
- What materials are used, and are they fire-safe? definition
- How can it be repaired or recycled? action
Strength
Load and stability.
Strength rating
Load rating and stability.
- What load is it rated for? measurement
- Has it passed stability tests? provenance
Ergonomics Fit to the body.
Chairs used for hours affect health.
Fit
Support and adjustment.
Ergonomic fit
Support provided.
- Does it support the back and allow feet flat on the floor? measurement
- Which adjustments are available? definition
Assessment
Workplace and clinical assessment.
Assessment
Who assesses suitability.
- Has the chair been assessed for this user? provenance
- When should a professional be involved? action
Mobility seating Wheelchairs.
Wheelchairs are regulated devices critical to their users.
Wheelchair type
Manual or powered.
Wheelchair spec
The wheelchair specification.
- What kind of wheelchair is it, and what are its limits? definition
- Which ISO 7176 tests has it passed? provenance
Service and repair
Keeping it working.
Service arrangement
Maintenance and repair.
- Who services and repairs it? provenance
- What is the plan if it fails away from home? action
What the second pass must settle
- Should wheelchairs be a separate entry from chairs as furniture?
- How should ergonomic properties be recorded?
- How should assistive seating be linked to prescriptions?