Tools – Wrench – screwdriver – or driver therefor – Handle or shank
Reexamination Certificate
2000-04-28
2001-08-28
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle or shank
C081S177100
Reexamination Certificate
active
06279430
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a F-type socket wrench which needs less storage space, and can be operated in a narrow space.
FIG. 1
shows a F-type socket wrench according to the prior art. This structure of F-type socket wrench comprises a handle
11
having a forked front end, and a coupling block
12
pivoted to the forked front end of the handle
11
and having a square coupling rod
121
for turning a wrench socket.
FIG. 2
shows another structure of F-type socket wrench according to the prior art. This structure of F-type socket wrench comprises a handle
21
having a rounded front end, and a coupling block
22
having a forked rear end pivoted to the rounded front end of the handle
21
and a front end terminating in a square coupling rod
221
for turning a wrench socket. The aforesaid two F-type socket wrenches have drawbacks. Because the size of connecting area between the handle
11
;
21
and the coupling block
12
;
22
is greater than the diameter of the square coupling rod
121
;
221
, these F-type socket wrenches require much storage space, and can not be used in a narrow space.
According to one embodiment of the present invention, the coupling block has two transverse grooves at front and back side thereof, a tightening up screw and a spring-supported steel ball and forced into engagement with the transverse grooves of the coupling block to hold the coupling block in an opening of the handle, permitting the coupling block to be turned within a limited angle. According to another embodiment of the present invention, the coupling block is coupled to the handle by a ball and socket joint.
REFERENCES:
patent: 2028561 (1936-01-01), Pilger
patent: 2503373 (1950-04-01), Browning et al.
patent: 2800821 (1957-07-01), Fruscella
patent: 2951405 (1960-09-01), Engquist
patent: 4662251 (1987-05-01), Kohal
patent: 5904077 (1999-05-01), Wright et al.
Pro-Techtor Inter-national Services
Smith James G.
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