Invention Grant
- Patent Title: Dual pawl ratchet mechanism and reversing method
- Patent Title (中): 双爪棘轮机构和倒档方法
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Application No.: US11726262Application Date: 2007-03-21
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Publication No.: US08499666B2Publication Date: 2013-08-06
- Inventor: Richard Hopper , Michael Foster , Christopher Thompson
- Applicant: Richard Hopper , Michael Foster , Christopher Thompson
- Applicant Address: US WI Kenosha
- Assignee: Snap-on Incorporated
- Current Assignee: Snap-on Incorporated
- Current Assignee Address: US WI Kenosha
- Agency: Seyfarth Shaw LLP
- Main IPC: B25B13/46
- IPC: B25B13/46

Abstract:
A dual-pawl ratchet wrench mechanism is disclosed having a stop mechanism for limiting over-travel of a reversing lever for selecting drive directions. In one form, the wrench mechanism includes a ball and spring assembly that cooperate with recesses to define proper positions for the reversing lever, and one or more ramps are provided between the recesses to promote tactile feel and to promote the reversing lever being rotated to a proper position. In some forms, the stop mechanism is formed on a stationary portion, such as a spacer or the wrench body, and a portion of the reversing lever. The design simplifies manufacturing, such as by simplifying assembly and minimizing the need for securements. Additionally, the reversing lever is assembled with the mechanism in a manner to improve sealing.
Public/Granted literature
- US20080229889A1 Dual pawl ratchet mechanism and reversing method Public/Granted day:2008-09-25
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