T-shaped ratchet wrench

• US 7,155,998 B1
• Filed: 07/08/2005
• Issued: 01/02/2007
• Est. Priority Date: 07/08/2005
• Status: Expired due to Fees

• Current Assignee: Wen-Tsai Shyu
• Original Assignee: Wen-Tsai Shyu
• Inventors: Shyu, Wen-Tsai
• Primary Examiner(s): Thomas; David B.
• Application Number:
  US11/176,905
• Publication Number:
  US 20070006688A1
• Time in Patent Office: 543 Days
• Field of Search: 81/60, 811/772, 811/778.5
• US Class Current: 81/60
• CPC Class Codes: B25B 13/461 with concentric driving and driven member
• CPC Class Codes: B25B 23/0035 Connection means between socket or screwdriver bit and tool
• CPC Class Codes: B25B 23/0042 Connection means between screwdriver handle and screwdriver shaft
• CPC Class Codes: B25G 1/005 for screwdrivers, wrenches or spanners with additional levers, e.g. for increasing torque

Abstract

A T-shaped ratchet wrench having a main body and a force-applying auxiliary arm. The main body includes a cross shaft and a working shaft. A ratchet driving mechanism having a change-over selector is disposed within an intersection position of both shafts. Each end of the cross shaft having an annular groove, and the working shaft has a polygonal head for inserting into a sleeve. Furthermore, the working shaft includes an annular groove in close vicinity to the cross shaft. The force-applying auxiliary arm includes an internal hole for mounting on either end of the working shaft or the cross shaft of the main body. The force-applying auxiliary arm has one end with an engaging socket and another end with a handle portion.

Claims

1. A T-shaped ratchet wrench comprising:

a) a main body having;

I) a cross shaft;

ii) a working shaft having a first end connected to a middle portion of the cross shaft and a polygonal head located on a second end thereof;

iii) a ratchet driving mechanism having a change-over selector located at an intersection of the cross shaft and the working shaft; and

iv) three annular grooves including a first groove located on a first of two opposing ends of the cross shaft, a second groove located on a second end of the two opposing ends of the cross shaft, and a third groove located on the working shaft; and

b) a force-applying auxiliary arm having;

I) an internal hole, a selected shaft end selected from a group consisting of the second end of the working shaft and one of the two opposing ends of the cross shaft is selectively inserted into the internal hole;

ii) an engaging socket located of on a first auxiliary arm end of the force-applying auxiliary arm and selectively locking the force-applying auxiliary arm in one of the three annular grooves of the selected shaft end; and

iii) a handle portion located on a second auxiliary arm end of the force-applying auxiliary arm.

2. The T-shaped ratchet wrench according to claim 1, wherein the engaging socket having:

a) a resilient element;

b) a locating element;

c) a plurality of engaging balls movable between engaging and disengaging positions; and

d) a supporting portion located on an inner wall thereof and movable between first and second positions,

wherein, when the supporting portion is located in the first position, the plurality of engaging balls are located in the engaging position and selectively being inserted into one of the three annular grooves; and

, when the supporting portion is located in the second position, the plurality of engaging balls are located in the disengaging position.

3. The T-shaped ratchet wrench according to claim 1, further comprising a pointed cone portion located on one of the two opposing ends of the cross shaft.

4. The T-shaped ratchet wrench according to claim 1, wherein the third groove is located on the working shaft at a position closer to the intersection of the cross shaft and the working shaft than the polygonal head.