Peg clutch: sliding pulley driven by a peg on a collar — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/peg-clutch-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 361 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A collar fixed to the shaft carries a peg standing out from its face; a loose pulley beside it carries a matching peg. Sliding the pulley along the shaft (by a fork, not drawn) brings the two pegs into the same plane, the collar's peg catches the pulley's and drives it; sliding it back frees it.
- Drawn engaged: both Ø3 pegs at 5.5 mm radius, 31.65° apart so that they touch (contact only); pegs are Ø3 × 12 dowels projecting 6 mm (the collar's grub screw and the shifting fork are not drawn).
- Brown's No. 361 (pulley clutch by a peg on the shaft and a peg on the pulley). Engages only once per turn and with a shock — a claw or friction clutch is used where that matters.
- Parts (each has its own page): peg-clutch-collar-d16x8-b5, peg-clutch-pulley-d30-b5, linear-shafts-h6, dowel-pins-metric.
- Brown's movement No. 361 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
shaft  Ø5 × 100
collar  Ø16 × 8
pulley  Ø30 face, Ø36 flanges
pegs  2 × Ø3 at r = 5.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 361: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_361.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/peg-clutch-mechanism/index.json
API: https://xemstudio.com/api/geometry?object=peg-clutch-mechanism