Tools – Wrench – screwdriver – or driver therefor – Slidable jaw adjustments
Reexamination Certificate
1999-02-04
2001-07-10
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Slidable jaw adjustments
C007S139000, C081S131000
Reexamination Certificate
active
06257100
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to an adjustable wrench, and especially to a wrench structure having a large adjusting range and one that can be used conveniently.
PRIOR ART
Wrenches are a generally used tool for rotating a nut, a screw, and other parts. Prior art wrenches are adjustable wrenches (that is, movable wrenches), such as those disclosed in Taiwan Patent No. 251500, 257126, 274755, 302793, 304909, 308925, 310647, 312187, 312188, 340437, etc.
However, the prior art adjustable wrenches are rotative wrenches with a small adjusting range, have a control button located on the front end thereof and have a large volume. If the operating space is small, then such wrenches are inconvenient in operation. Moreover, such wrenches cannot be used to measure the size of a nut, and the user cannot preset a scale.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide an adjustable wrench including a grasping portion, an adjustable wrench and a positioning portion. By pushing the adjusting portion, the gap between two wrench engaging surfaces can be adjusted. Thus, it has a large adjusting range and a quick speed. The adjustment can be performed directly. A control button with a large volume is unnecessary, thus it is suitable for use in a small space.
Another object of the present invention is to provide an adjustable wrench wherein rules indicated with scales are installed on the outer walls of the grasping portion, and an indicator is installed on the positioning portion for indicating the scale of the grasping portion. Therefore, a size may be preset accurately and can be used to measure the size of a screw and a nut, so that the wrench can be used as a measuring tool.
The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled in the art by referencing to the following drawings in which:
REFERENCES:
patent: 1481186 (1924-01-01), Busch et al.
patent: 1643002 (1927-09-01), Beszczak
patent: 2000962 (1935-05-01), Krag
patent: 2186430 (1940-01-01), Richter
patent: 2448815 (1948-09-01), Mattocks
patent: 3625096 (1971-12-01), Myers
patent: 4454791 (1984-06-01), Seward
patent: 5313860 (1994-05-01), Liou
Rosenberg , Klein & Lee
Smith James G.
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