# Double-pawl lever: fulcrum, two pawl pivots and an 80 mm handle

> What is a double-pawl lever?

- Category: Hardware › Mechanism parts
- Kind: Modern device
- Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
- Page: https://xemstudio.com/objects/double-pawl-lever-fulcrum-handle-80/ · JSON: https://xemstudio.com/api/geometry?object=double-pawl-lever-fulcrum-handle-80 · Plain text: https://xemstudio.com/objects/double-pawl-lever-fulcrum-handle-80/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 97.0 | 47.0 | 5.0 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- 5 mm plate pivoted on a Ø3 fulcrum pin with two Ø3 pawl pivots, one 23.32 mm out above the fulcrum and one 20.81 mm out below it, and an 80 mm handle: rocking it drives the ratchet with one pawl on the up stroke and the other on the down stroke.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| fulcrum | Ø3 |
| pawl pivots | 2 × Ø3 |
| handle | 80 mm |
| thickness | 5 mm |

## Where the files are

- Henry T. Brown (1868, public domain): [Five Hundred and Seven Mechanical Movements — scan on archive.org](https://archive.org/details/fivehundredseven00browiala) — web — Publisher's page; dimensions are facts
- 507movements.com: [Brown's movement No. 206: figure, his text and an animation](https://507movements.com/mm_206.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/double-pawl-lever-ratchet-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/double-pawl-lever-fulcrum-handle-80/index.json · license: https://xemstudio.com/files/hardware/double-pawl-lever-fulcrum-handle-80/LICENSE.md

- double-pawl-lever: [STEP](https://xemstudio.com/files/hardware/double-pawl-lever-fulcrum-handle-80/double-pawl-lever.step) · [STL](https://xemstudio.com/files/hardware/double-pawl-lever-fulcrum-handle-80/double-pawl-lever.stl) — lever in the wheel's frame (wheel axis at the origin), z 6..11

## Questions

**What is a double-pawl lever?**

5 mm plate pivoted on a Ø3 fulcrum pin with two Ø3 pawl pivots, one 23.32 mm out above the fulcrum and one 20.81 mm out below it, and an 80 mm handle: rocking it drives the ratchet with one pawl on the up stroke and the other on the down stroke.

## Fits with

- [Lever with two pawls driving a ratchet on both strokes](https://xemstudio.com/objects/double-pawl-lever-ratchet-mechanism/)