Cutlery – Cutting tools – Plural cooperating blades
Reexamination Certificate
2002-04-03
2003-11-04
Payer, Hwei-Siu (Department: 3724)
Cutlery
Cutting tools
Plural cooperating blades
C030S249000, C030S250000
Reexamination Certificate
active
06640442
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to pruning shears and, more particularly, to a cutting-stroke-adjustable pruning shears, which does not hook external objects when cutting, and has a neat outer looking.
BACKGROUND OF THE INVENTION
A conventional cutting stroke-adjustable pruning shears
90
, as shown in
FIG. 1
, comprises a fixed jaw
91
, a movable jaw
92
pivoted to the fixed jaw
91
for a scissors action and having an elongated slot
93
near the rear side and a plurality of retaining notches
94
arranged along one long side of the elongated slot
93
, a flat swivel arm
95
having a front side pivoted to a middle part of the fixed jaw
91
, a coupling arm
96
having a front part pivoted to the swivel arm
95
and a rear side fixedly mounted with a pivot, which is inserted through the elongated slot
93
and selectively positioned in one of the retaining notches
94
, a tension spring
98
connected between a rear side of the swivel arm
95
and one end of the coupling arm
96
, and two handles
99
respectively fastened to the rear side of the swivel arm
95
and the rear side of the fixed jaw
91
. When moving handles
99
with the hands, the jaws
91
and
92
are moved relative to each other. Further, the pivot can be shifted from one of the retaining notches
94
to another to change the position of the fulcrum. This structure of pruning shears is still not satisfactory in function. The drawbacks of this structure of pruning shears are outlined hereinafter.
1. Because the tension spring
98
is exposed to the outside, it may be forced to hook external objects or to fall out of position during cutting operation of the pruning shears. Further, because the tension spring
98
is not kept from sight, it destroys the sense of beauty of the outer appearance of the pruning shears.
2. Because the coupling arm
96
has one end pivoted to one side of the swivel arm
95
and the other end pivoted to one side of the movable jaw
92
, the asymmetrical connection between the coupling arm
96
and the swivel arm
95
and the asymmetrical connection between the coupling arm
96
and the movable jaw
92
are unstable.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a cutting stroke-adjustable pruning shears, which eliminates the aforesaid drawbacks.
It is one object of the present invention to provide a cutting stroke-adjustable pruning shears, which has a neat outer looking.
It is another object of the present invention to provide a cutting stroke-adjustable pruning shears, which does not hook up with external objects during its cutting action.
It is still another object of the present invention to provide a cutting stroke-adjustable pruning shears, which has the connection between parts made symmetrical to achieve a stable scissors action.
According to the present invention, the cutting stroke-adjustable pruning shears comprises a fixed jaw and a movable jaw pivoted together, the movable jaw having an elongated slot and a plurality of retaining notches in one long side of the elongated slot. A holder shell has two parallel side panels pivoted to a middle part of the fixed jaw at two sides and a spine connected between the parallel side panels. A coupling arm has one end pivoted to the parallel side panels of the holder shell and an opposite end mounted with a pivot coupled to the elongated slot of the movable jaw and selectively positioned in one of the retaining notches. A tension spring is disposed inside the holder shell and connected between the holder shell and the coupling arm. Two handles are respectively fastened to the fixed jaw and the holder shell.
REFERENCES:
patent: 5511314 (1996-04-01), Huang
patent: 5709030 (1998-01-01), Wang
patent: 5761815 (1998-06-01), Lin
patent: 5839195 (1998-11-01), Lin
patent: 5950314 (1999-09-01), Chang
Browdy and Neimark , P.L.L.C.
Payer Hwei-Siu
LandOfFree
Cutting stroke-adjustable pruning shears does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cutting stroke-adjustable pruning shears, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cutting stroke-adjustable pruning shears will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3153801