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Dual pawl ratchet mechanism and reversing method

A pawl mechanism and ratchet technology, applied in mechanical equipment, belts/chains/gears, manufacturing tools, etc., can solve the problems of complex manufacturing, increased cost, and small size.

Active Publication Date: 2008-10-01
SNAP ON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small size of the individual components, the ball almost has to be in the correct position to be effective
Also, if the ball is not almost in the correct position, the pressure of the spring will have no effect
[0007] An important aspect of these types of tools is that they are complex and costly to manufacture
Manufacturing complexity and cost increase in employing these ball / detent features

Method used

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  • Dual pawl ratchet mechanism and reversing method
  • Dual pawl ratchet mechanism and reversing method
  • Dual pawl ratchet mechanism and reversing method

Examples

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Embodiment Construction

[0028] figure 1 2 depicts the ratchet head 10. Although the connecting end 12 of the ratchet head 10 is described for connecting a valve yoke (not shown) and a stem (not shown), the ratchet head 10 should be considered as being able to, alternatively, be connected to the handle as a whole. The ratchet head 10 includes a main body 14 which in turn includes a connecting end 12 and a cavity 16 which accommodates the inside and outside of the ratchet head to provide torque to a workpiece (not shown) such as a sleeve. , fasteners or other tools, etc.

[0029] The ratchet head 10 is a double pawl ratchet wrench mechanism in which the user can freely select the torque direction. More specifically, the ratchet head 10 includes a first pawl 20 and a second pawl 22 that engage with a ratchet 24 that engages with a work piece. When the first pawl 20 is engaged with the ratchet wheel 24 , the torque power rotates with the ratchet head 10 in the first transmission direction, and at the...

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PUM

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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.

Description

technical field [0001] The present invention relates to a double pawl ratchet mechanism, in particular, to an improved reversible double pawl ratchet mechanism and method. Background technique [0002] Currently, there are many existing double pawl ratchet mechanisms. Typically these mechanisms are incorporated into a hand tool such as a wrench and / or screwdriver or the like, whereby there is a drive part that can engage, for example, a bolt head. The double pawl ratchet mechanism can select a first drive direction such that the hand tool provides torque when engaged with the bolt head and turned in a first direction, and slips or engages when turned in a second direction. A double pawl ratchet mechanism may select a second drive direction that is opposite to said first direction and provides torque and slip in the opposite direction. [0003] In the operation of this reversible double-pawl ratchet mechanism, there is generally a manually operated part, usually called a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H35/00F16H59/02B25B13/46B25B15/04
CPCB25B13/463
Inventor 理查德·哈泼迈克尔·福斯特克里斯多佛·汤普森
Owner SNAP ON INC
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