Tools – Wrench – screwdriver – or driver therefor – Slidable jaw adjustments
Reexamination Certificate
2000-02-18
2001-08-21
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Slidable jaw adjustments
Reexamination Certificate
active
06276241
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention has to do with wrenches and, in particular, to adjustable wrenches.
An adjustable wrench has a frame, which is typically formed of solid metal and includes a handle and a head defining a fixed jaw. A movable jaw is mounted on the head and includes a rack engageable with a thumb-operated worm gear for translationally moving the movable jaw relative to the fixed jaw. The frame and the movable jaw are typically forged and the construction of the wrench is relatively expensive.
It is known to provide wrenches of other types, such as end wrenches, ratchet wrenches and the like, having a laminated construction, including a plurality of layers of metal stacked together and secured by suitable fasteners, or by bonding or the like. However, such techniques have not heretofore been utilized in adjustable wrenches.
One drawback of laminated wrenches can be a tendency of the layers or plates of the wrench to delaminate or deform and separate under load.
SUMMARY OF THE INVENTION
It is a general object of the invention to provide an improved adjustable wrench which avoids the disadvantages of prior wrenches while affording additional structural and operating advantages.
An important feature of the invention is the provision of an adjustable wrench which is of laminated construction.
In connection with the foregoing feature, another feature of the invention is the provision of a wrench of the type set forth, wherein the handle portion is thinner than the head portion.
Still another feature of the invention is the provision of a laminated adjustable wrench which affords an improved trapping of the movable jaw in the head frame.
In connection with the foregoing features, a still further feature of the invention is the provision of a laminated adjustable wrench which inhibits deformation or separation of the plates of the wrench frame under load.
A still further feature of the invention is the provision of an adjustable wrench of the type set forth, which is of economical construction.
The invention consists of certain novel features and a combination of parts hereinafter fully described, illustrated in the accompanying drawings, 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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Cornog Robert A.
Thompson Christopher D.
Hail III Joseph J.
Seyfarth Shaw
Snap-on Technologies, Inc.
Thomas David B.
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