Biasing arrangement for a pawl of a reversible ratchet-type wrench
US6282991A · kind A · utility
Inventor
Key dates
| Filing date | Apr 3, 2000 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Apr 3, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B13/463
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A reversible ratchet-type wrench includes a handle and a head extended from the handle and having a hole. A web is defined between the handle and the head and includes a first cavity communicated with the hole. The web further includes a compartment communicated with the first cavity and a second cavity that is communicated with the compartment. A drive member is rotatably mounted in the hole of the head. A pawl is mounted in the cavity and includes a first side with ratchet teeth for releasably engaging with teeth on an outer periphery of the drive member. A switch member is rotatably received in the compartment of the web and switchable between two ratcheting positions for changing ratcheting direction of the drive member. A pin or coil spring is mounted between the switch member and the pawl for urging the ratchet teeth of the pawl to engage with the teeth of the drive member. The switch member is positioned in one of the two ratcheting positions by a ball and an elastic element mounted in the second cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.