carousel
Enable an AI agent to recognise a passenger carousel, assess its recorded operating condition and determine whether boarding, riding, stopping or maintenance is appropriate.
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.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a passenger carousel, assess its recorded operating condition and determine whether boarding, riding, stopping or maintenance is appropriate.
A carousel is a passenger-carrying amusement machine whose primary motion is rotation of a circular platform, and often of animal- or chariot-form seats on crank-driven poles, about a near-vertical axis at low angular speed for leisure riding.
It can be Identify the carousel configuration and map its rider positions and moving mechanisms.; Assess whether an identified rider position is available for boarding under documented conditions.; Compare observed rotation and mount movement with recorded operating limits.; Request or perform an authorised start, normal stop or emergency stop when the relevant conditions are established.; Restrict use of a rider position or the whole carousel when a defect or unresolved protective condition requires it.; Plan inspection or maintenance using the recorded motion mechanisms and isolation requirements..
Distinguishing features
The provisional referent carries people at rider positions that repeatedly travel around a common central axis.
Its intended service is a passenger amusement experience; an installation circulating luggage or workpieces requires a different scope decision.
Rider positions are carried by a common rotating assembly; a circular track alone does not establish that an object is a carousel.
Animal figures, music and a canopy are supporting identification evidence, not required identification tests.
Suspended swing rides and manually propelled playground roundabouts require an explicit registry boundary decision rather than classification by circular motion alone.
Scope
+ Rotating passenger assembly, central axis and supporting structure
+ Rider positions, decorative mounts, seating and any associated restraints
+ Drive, braking and mechanisms that produce additional rider motion
+ Boarding edges, entrances, gates and interfaces with stationary surroundings
+ Operating modes, protective functions and carousel-specific service condition
- Baggage carousels and industrial rotary storage or handling equipment
- Digital image carousels and other interface components
- Park-wide ticketing, queue management and visitor services
- Individual rider identity, health records and consent
- Site-wide utilities, buildings and emergency response arrangements
Characteristics
- Carousel referent
- passenger amusement carousel | alternative physical referent | unresolved Prevents the absence of a registry definition from becoming an unnoticed classification assumption.
- Rotating assembly diameter
- m, with measurement boundary stated Describes the assembly's physical extent and supports assessment of boarding geometry and surrounding clearances.
- Rider position configuration
- Recorded inventory of fixed seats, moving mounts, benches, accessible positions or other position types Different positions may impose different boarding, support and operating conditions.
- Position-specific occupancy limit
- persons and, where documented, kg per identified position Supports loading decisions without treating every mount or bench as interchangeable.
- Rotational speed
- rpm, distinguishing observed speed from documented permitted range Allows observed movement to be compared with the applicable operating conditions.
- Additional rider motion
- none | vertical reciprocation | local rotation | other documented motion | unknown Identifies motion and clearance requirements beyond rotation of the main assembly.
- Motion envelope
- m, referenced to identified moving parts and operating configuration Supports checking separation from stationary structures and other moving parts.
- Operating mode
- boarding | ready | running | stopping | faulted | isolated for service | unknown Determines which actions can be considered at the time of observation.
- Protective function condition
- For each fitted function: verified available | failed | bypassed | unverified Prevents a fitted gate switch, stop control or restraint check from being assumed effective.
- Applicable operating documentation
- Links to identified manufacturer instructions, configuration records and applicable inspection evidence Provides the basis for instance-specific limits and release decisions.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.carousel
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 16 findings · 24 questions.
Carousel identity and configuration Establishes which physical meaning of carousel applies and what passenger-carrying assembly is being modelled.
The term alone does not establish whether this entry denotes an amusement ride or another rotating installation.
Referent and boundaries
Records the evidence for classification and the limits of the modelled installation.
Passenger carousel identification
Record intended use and physical arrangement before applying passenger-carousel assumptions.
- What evidence establishes that this instance is intended to carry passengers for amusement? definition
- Does the registry include playground roundabouts or suspended swing carousels within this same entry? boundary
Rotating assembly and rider map
Identifies rotating decks or carriers and the rider positions attached to them.
Installed passenger configuration
Record the installed arrangement, including multiple levels or independently moving rider positions where present.
- Which decks, carriers and rider positions belong to the same rotating assembly? definition
- Which drawings or configuration records establish the installed arrangement and any later alterations? provenance
Rotation and secondary motion Describes how the carousel rotates, how individual positions move and how those movements stop.
Main rotation and additional mount motion create different operating limits, clearances and failure symptoms.
Main rotation and stopping
Records the main drive, observed rotation and documented stopping behaviour.
Rotation performance
Separate measured performance from permitted values and record the conditions under which each applies.
- What rotational speed, direction and stopping time are observed, and under what loading conditions? measurement
- Which instance-specific instructions define permitted rotation and acceptable stopping behaviour? provenance
Mount motion and clearance
Describes movement of rider positions relative to the main rotating assembly.
Secondary motion envelope
Record each additional movement and its relationship to nearby riders, mechanisms and fixed structures.
- Which mounts reciprocate, rotate locally or otherwise move relative to the main assembly, and what are their travel ranges? measurement
- Where does each moving position approach another mount, the deck, the canopy or a stationary structure? boundary
Rider loading and boarding Records how passengers enter, occupy rider positions and leave the carousel.
A stopped carousel is not automatically ready for boarding, and different rider positions may have different use conditions.
Rider position suitability
Records position-specific occupancy, support and restraint requirements.
Position use conditions
Associate each position type with documented loading and rider-support conditions rather than assuming a universal rule.
- What occupancy, load, rider eligibility and accompaniment conditions are documented for each position type? provenance
- What checks of seating, handholds and any fitted restraints are required before that position may be used? action
Stationary-to-rotating transfer
Records the boarding route across the interface between stationary access areas and the rotating assembly.
Boarding interface readiness
Record boarding gaps, steps, gates and any movable access equipment together with their required operating states.
- What gaps, level changes and route widths occur along each designated boarding route? measurement
- What conditions must be established before boarding begins and before rotation can resume, including the position of any ramp or gate? action
Operating readiness and service Connects carousel operating modes, protective functions and mechanism condition to permitted actions.
Decisions to start, stop or service the carousel depend on evidence about its controls and passenger-carrying mechanisms.
Cycle control and protection
Records prerequisites for movement and the behaviour of fitted protective functions.
Movement permission
Record how boarding completion, operating controls and protective conditions govern the next movement.
- Which fitted controls or protective functions prevent rotation during boarding, and what evidence verifies their current operation? provenance
- After a normal stop, emergency stop or power interruption, what documented checks and reset actions are required before movement? action
Mechanical condition and isolation
Records defects in the rotating support and rider-motion mechanisms, plus the conditions for safe service access.
Carousel service disposition
Connect observed defects and unresolved inspection items to position-level or whole-carousel restrictions.
- What inspection evidence covers the rotating support, drive connections, rider-mount attachments and any reciprocating mechanisms? provenance
- For the identified defect or maintenance task, what use restrictions and measures against unintended rotation or mount movement are required by the applicable procedure? action
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.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- traditional wooden park carousel with mixed standers, prancers and jumpers
- gallopers (jumping horses, typically clockwise fairground machines)
- non-jumping carousel (fixed seats, often anticlockwise)
- double-decker carousel
- menagerie carousel (mixed animals rather than horses only)
- portable or traveling fairground carousel
- kiddie or Hampton-style small carousel
- playground carousel (EN 1176-5 rotating platforms and chairs, distinct from park rides)
- Which of these kinds and varieties hold for the sense of carousel this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q208322 - Item 'carousel'; also said to be the same as merry-go-round; different from traffic roundabout.
- Unicode - U+1F3A0 (🎠 CAROUSEL HORSE) - Emoji named for the ride's characteristic figure, not a product identifier.
- Harmonized System / MCN - 9508.90.20 (heading 9508) - Wikidata records MCN 9508.90.20; HS 9508 covers roundabouts, swings and other fairground amusements.
- Which of these identifiers and schemes hold for the sense of carousel this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- ASTM F2291, Standard Practice for Design of Amusement Rides and Devices - ASTM International Committee F24 (widely adopted in US state ride law).
- ASTM F770, Standard Practice for Ownership, Operation, Maintenance, and Inspection of Amusement Rides and Devices - ASTM International Committee F24.
- EN 13814-1/2/3, Safety of amusement rides and amusement devices (design; operation; inspection) - CEN; national adoptions such as BS EN 13814 and NF EN 13814. Roundabouts are in the explicit scope of Part 1.
- ISO 17842-1:2023, Safety of amusement rides and amusement devices - Design and manufacture - ISO (aligned with the EN 13814:2019 series).
- EN 1176-5:2019, Playground equipment and surfacing - Additional specific safety requirements and test methods for carousels - CEN; Australian adoption AS 4685.5.
- Ontario TSSA Elevating and Amusement Devices Safety Program, Advisory 542-21 (2021): classifies carousels as Simple amusement rides under ASTM F2291 restraint classes 1-2.
- Which of these standards and regulation hold for the sense of carousel this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Permanent centrepiece rides in amusement parks, seaside piers, municipal parks and shopping centres, ridden in 2-4 minute cycles under an operator.
- Portable fairground and carnival machines assembled for a season or a show, then transported.
- Heritage objects: late-19th/early-20th-century wooden machines (Herschell, Looff, Dentzel and others) listed on the US National Register of Historic Places and operated as living museum pieces.
- Children's playground spinning platforms and rotating chairs specified separately from park rides.
- Small coin-operated or kiddie carousels at arcades and fairs; some of those fall outside ASTM F2291 / EN 13814 if they are patron-activated and unsupervised.
- Which of these real-world use hold for the sense of carousel this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- platform diameter - about 4-6 m (small 12-16 seat), 6-9 m (medium), 10-13 m (large), 10-14 m (double-decker); playground carousels are specified from just above 0.5 m, with some Type A rotating-chair limits around 2 m - m
- rotation speed - about 1-4 r/min (slower on larger machines); playground and simple-class rides are specified as low RPM - r/min
- ride cycle duration - about 2-4 - min
- overall height - about 3.5-9 m single-deck, 9.8-13.5 m double-decker - m
- drive power - about 1.5-15 - kW
- playground free height of fall / impact attenuation - user-station height capped by type (EN 1176-5 Table 1); impact area attenuation at least the free height of fall and never less than 600 mm; some national playground texts cap fall height near 1000 mm - mm
- Which of these typical measurements hold for the sense of carousel this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Patron fall or ejection from a horse, chariot or platform, especially on restraint class 1-2 machines with no or optional restraints.
- Entrapment or crushing at the platform edge, between sweeps, or between a jumping figure and the floor or canopy.
- Fatigue or fracture of the centre pole, sweeps, crank/jumper mechanism, bearings or welds under cyclic rotation.
- Unexpected start, drive or brake failure, or loss of speed control.
- Impact with scenery, canopy, adjacent fencing or other riders during boarding while the machine is moving.
- Fire in historic wooden platforms, rounding boards and canvas tilts.
- Playground-specific: centrifugal throw-off and inadequate impact-attenuating surfacing in the safety zone (typically ≥2 m around the machine).
- Which of these failure modes and hazards hold for the sense of carousel this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- United States: 'carousel' is the usual name; machines typically rotate anticlockwise; carving is often grouped into Coney Island, Philadelphia and Country Fair styles.
- United Kingdom and much of the Commonwealth: 'merry-go-round', 'roundabout' or 'gallopers'; gallopers usually run clockwise with all horses jumping and no standers.
- France: 'carrousel' or 'manège'; the English amusement sense is borrowed from the French military carousel (a tournament display), not the other way around.
- Japan: メリーゴーラウンド / 回転木馬; 'carousel' appears mainly as a loanword on park signage.
- Regulation splits the name: park and fairground machines follow amusement-ride codes (ASTM F24 / EN 13814 / ISO 17842); playground spinning equipment follows EN 1176-5 / AS 4685.5 even when also called a carousel.
- Which of these regional variation hold for the sense of carousel this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- merry-go-round / gallopers - In everyday English they are the same ride; trade usage sometimes reserves 'gallopers' for jumping-horse, usually clockwise fairground machines and 'carousel' for (often anticlockwise) machines that may include standers.
- traffic roundabout - A highway intersection, not a passenger ride; Wikidata marks carousel (Q208322) as different from roundabout. UK 'roundabout' is ambiguous until the setting (road vs fairground) is fixed.
- airport baggage carousel - A power-driven conveyor for luggage, not a passenger amusement device; no seats, no ride cycle, governed by airport/material-handling practice rather than ASTM F24 or EN 13814.
- chair-o-plane / wave swinger (Kettenkarussell) - Riders hang from chained seats that swing out under rotation; there is no walking platform of figures on poles.
- Ferris wheel - Rotation is about a horizontal axis with suspended cars; a carousel's primary axis is vertical or only slightly inclined.
- teacups, scrambler, tilt-a-whirl - Rotating amusement rides whose passenger units have additional spin or undulating paths and are classed above Simple in schemes such as TSSA 542-21; a carousel's passenger motion is essentially circular about one vertical axis, with optional simple heave of jumpers.
- warehouse or vertical storage carousel - An automated storage and retrieval machine that presents bins to an operator; it carries goods, not leisure passengers.
- UI image carousel - A software widget that cycles visual items; not a physical machine (outside PHY.OBJ except as a metaphor).
- Which of these neighbouring kinds and how to tell them apart hold for the sense of carousel this model covers, and on what evidence? provenance
Sources
- carousel (Q208322) - Canonical identifier, English gloss as a rotating circular-platform amusement ride, aliases (merry-go-round, galloper, jumper, roundabout), Unicode 🎠, MCN 9508.90.20, and the distinction from traffic roundabout.
- Carousel - Industry distinction between carousel and gallopers, horse positions (standers, prancers, jumpers), rotation-direction practice, and double-decker variants.
- ASTM F2291 Standard Practice for Design of Amusement Rides and Devices - US design practice for amusement rides including restraint, clearance envelope, acceleration, loads, and state adoption of ASTM F24; carousel-class rides fall under this family rather than a carousel-only standard.
- BS EN 13814-1:2019+A1:2024 Safety of amusement rides and amusement devices - Design and manufacture - European safety standard explicitly listing roundabouts among in-scope amusement devices, with companion parts on operation and inspection; ISO 17842-1:2023 is the aligned international counterpart.
- EN 1176-5:2019 Playground equipment and surfacing - Additional specific safety requirements and test methods for carousels - Playground-carousel typology (rotating chairs, classic carousel, bowl-like types), definition of carousel diameter, axis, impact-area rules, and the >500 mm diameter scope.
- Advisory 542-21 Amusement Device Classifications - Ontario classification of carousels as Simple amusement rides: low RPM and forces, low elevation, ASTM F2291 restraint class 1 or 2.
- The Complete Carousel Guide: Mechanics, Parts, Maintenance, Buying and Pricing - Typical commercial ranges for platform diameter, height, motor power, rotation speed and cycle time across small to double-decker machines.
- メリーゴーラウンド - Regional naming (US carousel, UK roundabout/merry-go-round, French carrousel/manège, Japanese merry-go-round/回転木馬) and the jumping-horse mechanism description.
What the second pass must settle
- Does vr.tr.carousel specifically denote a passenger amusement carousel, or must it also cover baggage, storage or other physical carousels?
- Are playground roundabouts and suspended swing carousels included here or owned by neighbouring registry entries?
- Does an existing Vercy world model already own this concept, requiring this registry entry to link to it?
- Which authoritative sources establish configuration-specific operating limits, rider conditions, protective functions and inspection criteria?
- Where should the ownership boundary fall between the carousel and its foundation, perimeter barriers, access equipment and decorative superstructure?