Cutlery – Cutting tools – Saw
Reexamination Certificate
2001-06-28
2002-10-01
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
Saw
C030S517000
Reexamination Certificate
active
06457244
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to hacksaws and more particularly to a structure of a hacksaw in which is quickly assembled or disassembled.
Typical hacksaw
10
(as shown in
FIG. 1
) comprises a frame
11
, a handle
12
on one end of the frame
11
, a blade
13
having a thru hole
131
adjacent the front end engaged with a lateral pin
141
of a threaded shank
14
, a wing nut
15
fastened a the outer end of the shank
14
, a thru hole
132
adjacent the rear end of the blade
13
engaged with a lateral pin
161
of a projection
16
. The blade
13
is tensed up or loosened up by rotation of the wing nut
15
. The hacksaw
10
further has a graduated portion
17
on the shank
14
to facilitate the blade a certain angle relative to the frame
11
. However, the wing nut
15
may be loosened under the shake of operation. Because the frame
11
is solid and not flexible, it could not serve for different lengths of the blade
13
.
SUMMARY OF THE PRESENT INVENTION
The present invention has a main object to provide a structure of a hacksaw which is quickly assembled or disassembled without loosening up.
Another object of the present invention is to provide a structure of a hacksaw in which the frame is lengthily adjustable to suite different lengths of the blade.
Still another object of the present invention is to provide a structure of a hacksaw in which the blade can be adjusted to exact angle.
Further object of the present invention is to provide a structure of a hacksaw which can be operated by two hands to increase its working capability.
The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.
REFERENCES:
patent: 3822731 (1974-07-01), Keymer
patent: 4571829 (1986-02-01), Withers
patent: 5388333 (1995-02-01), Chen
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