Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-01-05
2001-07-03
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
Reexamination Certificate
active
06253647
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to hand tools, and more particularly, to reversible ratchet wrenches.
2. Description of the Prior Art
In the past, reversible ratchet wrenches have been provided with levers located in the head of the wrench to control the direction of ratcheting. These constructions generally required two-hand operation by the user to move the lever in order to change the direction of ratcheting.
Reversible ratchet wrenches have also been provided with operating mechanisms remote from the head to change the direction of ratcheting. These mechanisms were complicated and still often required two-hand operation.
SUMMARY OF INVENTION
It is a general object of the invention to provide an improved reversible ratchet wrench which avoids the disadvantages of prior ratchet wrenches while affording additional structural and operational advantages.
An important feature of the invention is the provision of a ratchet wrench which is of relatively simple and economical construction.
A further feature of the invention is the provision of a wrench of the type set forth which can be operated with one hand to change the direction of ratcheting.
Another feature of the invention is the provision of a wrench of the type set forth which minimizes wear of its moving parts.
Another feature of the invention is the provision of a wrench of the type set forth which prevents self-reversing of the pawl when using an extension with high prevailing torque.
Certain ones of these or other features may be attained by providing a ratchet wrench which includes a handle having an exterior surface, a head coupled to the handle, a rotatable gear disposed in the head and having ratchet teeth, and a rotatable pawl moveable between a first pawl position in which the pawl is engaged with the gear to allow rotation of the gear in a first direction and substantially prevent rotation of the gear in a second direction and a second pawl position in which the pawl is engaged with the gear to allow rotation of the gear in the second direction and substantially prevent rotation of the gear in the first direction. The wrench also includes an elongated rotatable rod disposed in the handle having an actuator disposed at a first end of the rod and inclined with respect to the axis of the rod. The rod is rotatable from a first rod position, wherein the actuator biases the pawl to the first pawl position, to a second rod position, wherein the actuator biases the pawl to the second pawl position. The wrench also includes an operating mechanism disposed at the exterior surface of the handle and coupled to the rod.
The invention consists of certain novel features and a combination of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the details may be made without departing from the spirit, or sacrificing any of the advantages of the present invention.
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Eggert Daniel M.
Iwinski Dean J.
Danganan Joni B.
Hail III Joseph J.
Shaw Seyfarth
Snap-on Technologies, Inc.
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