Cutlery – Cutting tools – Plural cooperating blades
Reexamination Certificate
2002-04-05
2003-11-04
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
Plural cooperating blades
C030S179000, C030S258000
Reexamination Certificate
active
06640441
ABSTRACT:
RELATED U.S. APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
The present invention relates generally to a pair of pipe shears, and more particularly to a means to locate securely a pipe which is to be cut by the pipe shears.
BACKGROUND OF THE INVENTION
As shown in
FIGS. 1 and 2
, a prior art pair of pipe shears is designed to cut plastic pipe and is formed of two handles
01
and
02
, a fixed jaw
03
, and a movable jaw
04
pivoted with the fixed jaw
03
. The fixed jaw
03
is provided in the center with a gap
05
which is aligned with the cutting edge of the blade of the movable jaw
04
, as illustrated in FIG.
2
. When a plastic pipe
06
is cut by the movable jaw
04
in conjunction with the fixed jaw
03
, the cutting edge of the blade of the movable jaw
04
is put into or through the gap
05
. In view of the fact that the fixed jaw
03
is not provided with a means to hold securely the plastic pipe
06
, the plastic pipe
06
is apt to deflect in the cutting process, thereby resulting in the cut
07
being angularly deviated by x degrees. In other words, the prior art pipe shears are incapable of cutting the plastic pipe
06
with precision.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a pair of pipe shears with a structure to locate securely a pipe to be cut by the pipe shears. The pipe-locating structure of the present invention is fastened to the fixed jaw of the pipe shears and is formed of two pipe-locating members, with each having an arcuate skidproof surface and a greater contact surface.
REFERENCES:
patent: 1062146 (1913-05-01), Douglass
patent: 1179830 (1916-04-01), Hayes
patent: 2775032 (1956-12-01), Sorensen
patent: 5235750 (1993-08-01), Brown
patent: 5822865 (1998-10-01), Bosch et al.
patent: 6308421 (2001-10-01), Wang
Harrison & Egbert
Hung Chuan Hsian Industries Co., Ltd.
Watts Douglas D.
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