Ratchet wrench with force balanced pawl
US6301999A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2000 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Jun 20, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B13/463
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A ratchet wrench comprises a wrench body having a handle portion and a pawl engaging surface. A ratchet gear is removably engaged with a fastener such that torque applied to the gear is transmitted to the fastener to effect rotation. The gear is mounted to the body such that the gear and the body are rotatable relative to one another about a gear axis. The gear has a plurality of gear teeth having opposing tooth surfaces. A pawl has first and second tooth engaging surfaces and a load receiving surface. The pawl is mounted to the body for pivotal movement about a pawl axis with the load receiving surface engaging the pawl engaging surface. The pawl is movable to a gear driving position wherein the first and second tooth engaging surfaces are positioned for driving engagement with respective tooth surfaces of a pair of the gear teeth. A manual force applied in a torque applying direction to the handle portion is transmitted from the body to the pawl via the engagement between the pawl engaging surface and the load receiving surface and from the pawl to the gear via the engagement between the tooth engaging surfaces and the tooth surfaces of the pair of the gear teeth so as to apply t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.