Pneumatic wrench having enhanced strength

Details Pneumatic wrench having enhanced strength Pneumatic wrench having enhanced strength

2007-01-23

2007-01-23

Tawfik, Sameh H. (Department: 3721)

Tool driving or impacting

Impacting devices

With means for rotating tool

C173S093000, C173S093500

Reexamination Certificate

active

10895207

ABSTRACT:
A pneumatic wrench includes a pneumatic motor, a striking portion, and a drive shaft. The striking portion includes a support seat, a first hammer, and a second hammer. Thus, the first hammer and the second hammer are driven by the fixed pins and the movable pins of the support seat respectively, thereby preventing the fixed pins and the movable pins from being worn out or broken due to a stress concentration so as to increase the lifetime of the pneumatic wrench. In addition, the connecting rib is located between and connected to the first driven block and the second driven block of the drive shaft so as to enhance the structural strength of the drive shaft.

REFERENCES:
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patent: 3661217 (1972-05-01), Maurer
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patent: 6491111 (2002-12-01), Livingston et al.
patent: 2005/0145401 (2005-07-01), Chang
patent: 2006/0011363 (2006-01-01), Chang

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