Cutlery – Cutting tools – Saw
Reexamination Certificate
2003-08-07
2004-08-10
Watts, Douglas D (Department: 3724)
Cutlery
Cutting tools
Saw
C030S517000, C030S519000
Reexamination Certificate
active
06772522
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to carpentry tools and more particularly to a quick disassembly hacksaw.
A prior art hacksaw
10
(as shown in
FIG. 1
) comprises generally a frame
11
, a handle
12
on rear end of the frame
11
and a saw blade
13
which has a pair of thru holes
131
and
132
respectively formed adjacent two ends thereof. The thru hole
131
engages on a lateral pin
141
of a threaded shank
14
in a graduated tube
17
under the front end of the frame
11
and is fastened with a wing nut
15
. The thru hole
132
engages on a lateral pin
161
of a projection
16
on the bottom of the handle
12
. The blade
13
is being tensed and/or loosened up by rotation of the wing nut
15
. The graduated tube
17
facilitates the blade
13
to turn a certain angle relative to the frame
11
. However, it has the disadvantages that the wing nut
15
may be loosened up under the shake of operation and the frame is of solid structure and not flexible, so that this type of hacksaw
10
could not serve for different lengths of the blades
13
.
My previous invention entitled STRUCTURE OF A HACKSAW (U.S. U.S. Pat. No. 6,457,244 B1, Issued on Oct. 1, 2002) has improved the above discussed disadvantages. After repeated tests and application, it proves that this type of hacksaw achieves its expected result. Nevertheless, it has still the spaces of improvement to be done in order to intensify the blade cutting strength, to simplify the manufacturing process and to speed up the quick assembly and/or disassembly of the blade.
SUMMARY OF THE PRESENT INVENTION
The present invention has a main object to provide a quick disassembly hacksaw which has a simplified manufacturing process, intensified blade, quick assembly and/or disassembly structure in order to achieve an expected operational result.
Another object of the present invention is to provide a quick disassembly hacksaw which has an adjusting mechanism providing a buffer space to prevent the blade from becoming bent and/or deformed to bring about elasticity due to the loose of a fastening mechanism during disassembly of the blade.
Accordingly, the quick disassembly hacksaw of the present invention comprises generally a frame, a front handle, a rear handle, an adjusting mechanism at front end of the frame and a fastening mechanism at the rear end of the frame. Each of the mechanisms respectively connects a threaded shank and pivoted with a positioning rod. A saw blade has a thru hole in each end engaged with a projection on a polyhedron on inner end of the threaded shank and the positioning rod. The adjusting mechanism is provided to adjust the tensions of the blade and the fastening mechanism is provided to the blade. When the fastening mechanism is released. The blade together with the adjusting mechanism move forward to avoid the blade to be bent and/or deformed to create elasticity in order to smoothly disassembly the blade from the frame.
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: 4079763 (1978-03-01), Riley
patent: 4571892 (1986-02-01), Brill
patent: 5388333 (1995-02-01), Chen
patent: 6457244 (2002-10-01), Huang
Huang Yin-Hae
Li Hsin-Hung
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