Lever with two pawls driving a ratchet on both strokes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/double-pawl-lever-ratchet-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 206 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A lever rocks on a fulcrum beside the ratchet wheel and carries two pawls, pinned one above and one below the fulcrum. Swinging the handle one way, the upper pawl pivot moves toward the wheel and its pawl pushes a tooth; swinging it back, the lower pivot moves toward the wheel and the lower pawl pushes another tooth, while the first slides back over the teeth. The wheel is driven the same way on both strokes, so the motion is nearly continuous.
- Catalog Ø40, 24-tooth ratchet; both pawls drawn with their end faces lying on the steep faces of two teeth (face contact, no overlap) at the same instant.
- Brown's No. 206 (lever with rising and falling pawls giving a nearly continuous rotary motion to a ratchet wheel).
- Parts (each has its own page): ratchet-and-pawl, lever-pawl-24t-d40-upper, lever-pawl-24t-d40-lower, double-pawl-lever-fulcrum-handle-80, dowel-pins-metric.
- Brown's movement No. 206 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
ratchet  24 T, Ø40
pawls  2, face contact
drive  both strokes, same direction

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. 206: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_206.html

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