Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-08-09
2001-10-16
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063100
Reexamination Certificate
active
06301998
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ratchet wheel with asymmetric arcuate concave teeth or non-arcuate concave teeth. The present invention also relates to a socket wrench in which the ratchet wheel is mounted. The ratchet wheel with asymmetric arcuate concave teeth provides improved structural strength and improved torque. The ratchet wheel with non-arcuate concave teeth is easy to form and thus reduces the production cost.
2. Description of the Related Art
A wide variety of spanners and wrenches have heretofore been provided. Ring spanners are the best choice for driving fasteners (e.g., nuts, bolt heads, etc) in a limited space that is uneasy to access and difficult to operate all kinds of ratcheting tools. Nevertheless, conventional ring spanners have low driving torque. Ratchet type ring spanners have been proposed to solve this problem. A ratchet wheel is mounted in the box end of a ring spanner for driving fasteners at high torque. It is, however, found that, the structural strength of the ratchet wheel is weak as an outer periphery of the ratchet wheel is processed to form a plurality of arcuate teeth with a considerable depth. U.S. patent application Ser. No. 09/365,738 proposes a ratchet wheel with asymmetric arcuate concave teeth or non-arcuate concave teeth as well as ratchet type ring spanners with such ratchet wheel. The present invention is intended to provide a ratchet wheel that is particularly suitable for socket wrenches.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide an improved ratchet wheel that has asymmetric arcuate concave teeth for providing improved structural strength and improved torque.
It is another object of the present invention to provide an improved ratchet wheel that has non-arcuate concave teeth to allow higher production rate, as the non-arcuate concave teeth can be formed by means of roll squeezing method, investment casting. or molding. The non-arcuate concave teeth may be symmetric or asymmetric. The ratchet wheel with non-arcuate concave teeth may bear higher torque during ratcheting (i.e., tightening or loosening a fastener).
The present invention also provides a socket wrench equipped with a ratchet wheel in accordance with the present invention. In an embodiment of the invention, the socket wrench has a head for receiving a ratcheting wheel with asymmetric arcuate concave teeth. In another embodiment of the invention, the socket wrench has a head for receiving a ratcheting wheel with non-arcuate asymmetric concave teeth. In a further embodiment of the invention, the socket wrench has a head for receiving a ratcheting wheel with non-arcuate symmetric concave teeth.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 1614039 (1927-01-01), Mandl
patent: 2317461 (1943-04-01), Jackson
patent: 2764048 (1956-09-01), Thompson
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patent: 3742788 (1973-07-01), Priest
patent: 4991468 (1991-02-01), Lee
patent: 5533427 (1996-07-01), Chow
patent: 5636557 (1997-06-01), Ma
patent: 6148695 (2000-11-01), Hu
patent: 921198 (1954-12-01), None
Hail III Joseph J.
Ojini Anthony
Rosenberg , Klein & Lee
LandOfFree
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