restraint
a device that retards something's motion
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.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an AI agent to recognise a restraint device, assess its ability to retard specified motion, and identify the conditions for applying, adjusting or releasing it.
A restraint is a physical device that opposes or limits the motion of a body through an applied resisting force or a mechanical constraint.
It can be Match a restraint kind to the required target motion, interface and loading envelope; Identify the attachments and reaction body needed to establish its restraint load path; Determine whether engagement and retention are verifiable before relying on restraint; Identify permitted adjustment or release actions from the device's state and documented conditions; Flag inspection, replacement or withdrawal when condition or loading history invalidates use; Record unresolved overlap with neighbouring device models and unresolved application requirements.
Distinguishing features
It is a physical device with an identifiable mechanism for opposing motion; an instruction or prohibition alone does not qualify.
Retarding a specified target motion is an intended function, rather than incidental friction, weight or obstruction.
Its restraining effect can be traced through contact or coupling to a reaction body or opposing part.
It may limit excursion, reduce motion or hold position; complete immobilisation is not required by the registry definition.
A brake, damper, clamp or tether may satisfy this definition, so overlap must be resolved through function and registry relationships rather than assumed exclusion.
Scope
+ The target motion and degrees of freedom the device is intended to retard
+ The mechanism that develops restraining force or torque
+ Contact, attachment and anchorage interfaces that transmit restraint loads
+ Engagement, adjustment, retention and release behaviour
+ Load limits, deterioration and failure modes relevant to maintaining or releasing restraint
+ Application-specific evidence needed to judge whether a restraint is suitable
- Restraint as self-control, a legal restriction or an organisational policy
- The complete vehicle, machine, structure or other system incorporating the device
- The full model of the person, animal or object being restrained
- Product catalogues and individual device inventory records
- Clinical, legal or operational authority to restrain a person or animal
- Standalone models of neighbouring device kinds, whose overlap with restraint requires registry checking
Characteristics
- Restrained target and application
- Target kind, target interface and intended use context Suitability depends on what receives the restraining load and under what circumstances.
- Restrained degrees of freedom
- Translation or rotation about specified axes; one-way or bidirectional restraint A device can oppose one motion while leaving another free.
- Motion-retarding mechanism
- Examples to verify: tension, friction, positive mechanical engagement, elastic resistance or dissipative resistance The mechanism determines how resistance develops and what can defeat it.
- Reaction path
- Restrained target → contact or connector → restraint elements → reaction body The device cannot deliver its intended effect if the load path is incomplete or unsuitable.
- Rated restraint load
- N for force or N·m for torque, with direction, duration and rating basis Load ratings are meaningful only with their test conditions and intended loading mode.
- Permitted travel and compliance
- mm or m of translation; degrees or radians of rotation; load-displacement relationship where relevant Slack, stretch and deformation determine how far the target can move before and during restraint.
- Dynamic loading envelope
- Applicable speed in m/s or rad/s, energy in J, and loading duration in s Holding a steady load and arresting moving mass are different demands.
- Engagement and retention state
- Released, partly engaged, engaged, secured against unintended release, jammed or unknown Apparent contact does not establish that the restraint is carrying or ready to carry load.
- Actuation and power dependency
- Manual, passive or powered; separate dependencies for engagement, retention and release Loss of power or actuation can affect holding and release differently.
- Release under load
- Permitted, restricted, prohibited or unverified, with specified release conditions Release may be impossible under load or may allow sudden target motion.
- Condition for continued service
- Serviceable, inspection required, withdrawn, single-use function expended or unknown Wear, damage and previous loading can invalidate an otherwise suitable restraint.
Analytical facets
- substance
- material
- origin
- manufactured
- agency
- inert
- mobility
- portable
- scale
- handheld
- affordances
- graspable, operable
Also called
+75
Where this came from
oewn:2024 · CC BY 4.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 15 findings · 25 questions.
Motion and functional boundary Identify the motion the restraint opposes and the limits of this registered sense.
The broad definition must distinguish intended restraint from incidental resistance without prematurely excluding overlapping device kinds.
Target motion
Describe the target and the motion against which restraint is intended.
Restrained motion definition
Record target motion, direction and intended residual freedom as matters to establish for each restraint kind.
- What target and which translational or rotational degrees of freedom is this restraint intended to oppose? definition
- How much motion remains permitted, and is the intended effect slowing, limiting excursion or holding position? measurement
Neighbouring device boundaries
Resolve overlap with devices whose functions can also retard motion.
Restraint role and registry overlap
Establish whether restraint is the defining device function or a role already represented by another registered model.
- What establishes that retarding motion is an intended function rather than an incidental effect of contact or support? boundary
- Which existing registry or world-model entries cover the same brake, damper, clamp, tether or other mechanism, and how should this entry relate to them? boundary
Resistance and load path Describe how restraining force develops and passes between the target and a reaction body.
A restraint's effectiveness depends on its mechanism and the complete chain transmitting its load.
Resistance generation
Characterise the physical mechanism and its response to target motion.
Restraining response
Establish how resistance varies with engagement, displacement or speed, including whether energy is stored or dissipated.
- Which physical mechanism produces the opposing force or torque, and what initiates that resistance? definition
- How does resistance vary with displacement or speed, and what evidence describes energy storage, dissipation or rebound? measurement
Attachments and reaction
Trace the restraint load through target interfaces, connectors and reaction points.
Complete restraint load path
Identify the interfaces that must remain engaged and the load directions they must sustain.
- Through which contacts, connectors and anchorage or opposing parts does the target's restraint load pass? definition
- Which interface dimensions, load directions and connection conditions determine compatibility with the target and reaction body? measurement
Restraint capacity and target effects Establish the loading envelope and the consequences of transferring load to the target.
Preventing motion is insufficient if the device, attachment or restrained target cannot tolerate the resulting loads.
Static and dynamic capacity
Separate sustained holding performance from response to moving or suddenly loaded targets.
Load rating basis
Record capacity only with the conditions and evidence that make the rating applicable.
- What force or torque can the restraint sustain, in which directions and for what duration? measurement
- What test or technical source distinguishes working capacity from proof load, failure load and dynamic arrest performance? provenance
Travel and contact consequences
Account for movement before restraint takes effect and for loads concentrated at the target interface.
Target motion and load transfer
Determine whether slack, deformation and contact loading are compatible with the intended restraint outcome.
- How much target travel results from initial slack, engagement delay and deformation under the specified load? measurement
- What target-specific limits on contact force, pressure, deformation or sudden deceleration constrain suitability? boundary
Engagement, retention and release Represent the transitions that establish restraint, keep it effective and permit motion again.
A restraint can fail through incomplete engagement or unintended release, while inability to release can create a separate operational problem.
Establishing and retaining restraint
Identify engagement actions, retention mechanisms and observable evidence of state.
Verified engagement
Separate partial contact, functional engagement and protection against unintended disengagement.
- What sequence establishes restraint, and what indicators or checks distinguish partial engagement from effective retention? action
- How do power loss, vibration, load reversal or actuator failure affect the retained state? definition
Controlled release
Establish the prerequisites and consequences of restoring target motion.
Release conditions and resulting motion
Record documented release provisions, including restrictions imposed by applied load or stored energy.
- Under what load and energy conditions may the restraint be adjusted or released, and what must support or control the target first? action
- What documented release method remains available if the normal actuator, power supply or retention mechanism fails? action
Serviceability and suitability evidence Connect condition, loading history and application requirements to continued reliance on the restraint.
Restraint capacity and release behaviour can change through deterioration or prior loading, and suitability claims require application-specific support.
Deterioration and withdrawal
Identify defects and events that impair holding, retention or release.
Loss of restraint performance
Establish mechanism-specific inspection and withdrawal criteria without assuming that visible intactness proves serviceability.
- Which wear, corrosion, deformation, contamination or connector defects can cause slipping, separation or failure to release? definition
- Which inspection results, overload events or expended components require servicing, replacement or withdrawal? action
Application and rating evidence
Identify the sources and applicability limits behind performance and conformity claims.
Supported suitability claims
Require evidence that addresses the intended restraint application and the relevant device configuration.
- Which standards or certification schemes apply to this restraint subtype and use, and who issues them? provenance
- Which technical documents or test records support its ratings, interface requirements and service limits, and to which configurations do they apply? provenance
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is a broad functional category; the listed kinds overlap and do not constitute a formal classification.
- Applicable standards and rated loads depend on the application, so no universal standard or typical measurement range is asserted.
- The intended registry boundary should be checked, particularly whether brakes and dampers are included or treated as neighbouring categories.
- Which of these check these first hold for the sense of restraint this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Strap or belt restraints
- Tether restraints
- Clamping restraints
- Chocks and wedges
- Mechanical stops
- Braking restraints
- Which of these kinds and varieties hold for the sense of restraint this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Securing cargo against movement during transport
- Limiting occupant movement in vehicles
- Holding workpieces during machining or assembly
- Preventing parked wheeled equipment from rolling
- Limiting the travel of moving mechanical components
- Which of these real-world use hold for the sense of restraint this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Overload can break the restraint or pull out its anchorage.
- Loose attachment, poor fit or insufficient friction can allow slipping or escape.
- Wear, fatigue, corrosion or material degradation can reduce load capacity.
- Sudden engagement can impose impact loads on the restrained body and its supporting structure.
- Unintended release can permit uncontrolled motion; failure to release can cause entrapment.
- Which of these failure modes and hazards hold for the sense of restraint this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- brake - A brake specifically resists motion to reduce speed or hold position; a restraint can instead limit travel through a tether, clamp or stop.
- damper - A damper dissipates energy to reduce motion or oscillation, but need not prevent displacement or retain a body within a fixed boundary.
- fastener - A fastener joins components; a restraint is defined by its motion-limiting function, although one device can perform both roles.
- restraint - This entry covers a physical device, rather than self-control, a restriction imposed by authority or the act of restraining.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of restraint this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend restraint to include brakes and dampers directly, or should those concepts remain separate models linked by a motion-retarding role?
- Which existing world model, if any, already covers this concept and should serve as its single source of truth?
- Which restraint subtypes need distinct extensions for cargo, machinery, occupants, people or animals without splitting the registered thing prematurely?
- Which primary sources establish representative load, travel and dynamic-performance ranges for the included subtypes?
- Which application-specific standards, inspection criteria and release requirements can be substantiated, and which cannot be generalised across restraint devices?