Tools – Wrench – screwdriver – or driver therefor – Sliding jaw face
Reexamination Certificate
1999-05-12
2001-03-20
Scherbel, David A. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Sliding jaw face
C081S129000
Reexamination Certificate
active
06202516
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a spanner, otherwise known as a wrench. More specifically, the present invention concerns a universal and self-adjusting wrench having a spring biased member for selectively engaging with a nut or bolt. The present invention is low in cost and can be used with a variety of sized bolts as well as defective bolts.
2. Description of Related Art
In connection with wrenches in general, it is known that simple wrenches require manual adjustment to be used on different sized bolts, and in some instances require a selection and replacement of certain parts in order to use the same wrench on various sizes of bolts. For this reason, there is a preference among some users for a ratchet type wrench, whereby the adjustable parts of the ratchet are self contained and manually adjustable to the desired size of bolt. These manually adjustable ratchet type wrenches are cumbersome and can cause delay when attempting to adjust it to the proper size for bolt removal or application. Additionally, the ratchet type of wrenches have numerous parts which may be prone to breakage and difficulty of adjustment over a period of time. Accordingly, a need in the art exists for a wrench which may be used similar to a ratchet type of wrench, without the problems associated therewith. Therefore, the inventor has solved this problem in the art by providing a wrench which automatically adjusts to the size required to tighten or release a bolt, and is simple to use.
SUMMARY OF THE INVENTION
Therefore, it is the object of this invention to provide a wrench easily used on a wide variety of common sized bolts.
It is a further object of this invention to provide a wrench which is self adjusting without manual intervention.
It is still another object of this invention to provide a self-adjusting wrench that is easy to use on either normal or defective bolts.
These and other objects of the invention are achieved by providing a wrench including a handle portion and a head portion coextensively connected with the handle portion. The head portion of the wrench has opposing flat surface faces and first and second jaw portions defining a substantially arcuate crescent interior of the wrench head. A slot is formed in the first jaw portion, the slot having a hole formed at a base end thereof through the head portion for access from an external peripheral surface of the head portion. A block member is slidably received within the slot, the block member including a base end and an exposed end, the exposed end protruding into the open crescent area, and a threaded hole formed in the base of the block member. A coiled spring is positioned between a base end of the block member and the base end of the slot, and a screw having a shank and a threaded tip at one end of the shank is inserted into the base of the block via the hole formed at the base of the first jaw portion, through the coiled spring, and is secured by engaging the threaded portions of the screw and the block. A securing bracket prevents displacement of the block member from the slot. The block member is adjustable to the extent that the spring compresses and otherwise functions as if it were integrally formed with the first jaw portion of the wrench head.
REFERENCES:
patent: 2647425 (1953-08-01), Mortensen
patent: 2697372 (1954-12-01), Lane
patent: 3306142 (1967-02-01), Buteau
patent: 4706528 (1987-11-01), Inoue
patent: 5533428 (1996-07-01), Pradelski
Ojini Anthony
Scherbel David A.
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