Note: Descriptions are shown in the official language in which they were submitted.
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METAL SHEARS
FIELD OF THE INVENTION
The present invention relates generally to a metal shears, and
more particularly to the metal shears having jaws that can be adjusted to
form therebetween a desired angle.
BACKGROUND OF THE INVENTION
The conventional metal shears is generally composed of a toggle
set, a cutting set and a pair of hand grips. The toggle set comprises a pair
of toggles fastened pivotally with a locating bolt. The cutting set
comprises a pair of jaws having a blade. The jaws are respectively
pivoted at the lower segment thereof with the toggles. The hand grips are
fastened with the lower ends of the toggles. As the toggles are actuated
by the hand grips to move in opposite directions, two blades are thus
caused to move accordingly to facilitate the cutting of a metal material,
such as a screw, a metal wire, etc.
Such a prior art metal shears as described above is defective in
design in that there is always a gap between two blades when the jaws
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are moved to be closest together. The gap undermines the cutting effect
of the prior art metal shears. In order to elimin~te the gap referred to
above, the locating bolt is modified such that the locating bolt is
provided with an eccentric portion which is received in the jaw. As a
result, the gap between two blades can be minimi7ed by rotating the
locating bolts to adjust the distance between the jaws. However, the gap
still remains if two blades are not parallel to each other.
SUMMARY OF THE INVENTION
It is therefore the primary objective of the present invention to
provide a metal shears, which comprises two blades that can be so
adjusted as to be parallel to each other.
It is another objective of the present invention to provide an
improved metal shears comprising two blades that can be so adjusted as
to be parallel to each other.
It is another objective of the present invention to provide an
improved metal shears comprising two blades which can be adjusted
easily to form therebetween a desired angle to facilitate the cutting of a
metal material.
The foregoing objectives of the present invention are attained by
an improved metal shears, which comprises a toggle set, a cutting set,
and a pair of grips. The toggle set is made up of a first toggle and a
second toggle, which are respectively fastened pivotally by means of a
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first pivoting member. The cutting set comprises a first jaw, a second
jaw, and a pair of cover pieces. The first jaw and the second jaw have a
blade which is pivoted to the cover piece by a locating bolt and is further
pivoted to the corresponding toggle by means of a second pivoting
member. The hand grips are fastened with the first and the second
toggles. The first toggle is provided with an adjustment set for adjusting
the distance between the first pivoting member and the second pivoting
member so as to force the first jaw to swing to change the angle formed
by the blades.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an exploded view of an embodiment of the present
invention.
FIGS. 2-4 are schematic views illustrating in series the
adjustment of the angles formed by the blades of the first and the second
jaws of the embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
As shown in all drawings provided herewith, an improved metal
shears 10 embodied in the present invention is composed of a toggle set
12, a cutting set 14, and a pair of grips 16.
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The toggle set 12 comprises a first toggle 20 and a second toggle
30, which are provided respectively at the lower segments thereof with
protuberances 22 and 32, and are fastened pivotally at the opposite sides
of the upper segments thereof by means of a first pivoting member 121.
The cutting set 14 comprises a first jaw 40, a second jaw 50, and
a pair of cover plates 60. The first and the second jaws 40 and 50 are
provided respectively at the upper segments thereof with blades 42 and
52 opposite to each other. The first and the second jaws 40 and 50 are
respectively pivoted at the midsegments thereof to the cover plates 60 by
a pair of locating bolts 62, and at the lower segments thereof to the
corresponding first and second toggles 20 and 30 by a pair of second
pivoting members 141 similar in construction to a threaded rod. The
second pivoting members 141 are kept apart from the first pivoting
member 121 by an appropriate distance.
The grips 16 are fastened respectively with the lower ends of the
first and the second toggles 20 and 30.
In operation, the first and the second toggles 20 and 30 are
actuated by the grips 16 to swing on the axis of the first pivoting
member 121 such that the first jaw 40 and the second jaw 50 are forced
to swing respectively on the axes of the locating bolts 62 so as to execute
the cutting of a metal wire or screw by moving the blades 42 and 52
apart or close together.
The metal shears 10 of the present invention is characterized in
construction in that the first toggle 20 is provided at the upper segment
thereof with a first support arm 24 and a second support arm 26, which
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are separated from each other by an empty portion 70. The first arm 24 is
fastened pivotally at the upper end thereof with the first pivoting
member 121 while the second support arm 26 is fastened pivotally at the
upper end thereof with the second pivoting member 141 corresponding
thereto. The empty portion 70 has a first threaded hole 72 coaxial with a
through hole 74 of the second support arm 26. The empty portion 70
further has a second threaded hole 76 separated from the through hole 74
by an appropriate distance.
The first toggle 20 is further provided with an adjustment set 18,
which comprises a first adjusting screw 80 having a small diametric end
801 engageable with the first threaded hole 72 via the through hole 76.
The first adjusting screw 80 further has a large diametric end 802
capable of urging one side of the second support arm 26. The adjustment
set 18 further comprises a second adjusting screw 82 engageable with
the second threaded hole 76 such that one end of the second adjusting
screw 82 is located in the empty portion 70 and is capable of urging one
side of the first support arm 24.
In operation, the small diametric end 801 of the first adjusting
screw 80 is engaged with the first threaded hole 72 such that the large
diametric end 802 is caused to urge the second support arm 26 to swing
to one side. The second support arm 26 is forced to swing to another side
by the second adjusting screw 82 which is kept in the state of urging the
first support arm 24.
As illustrated in ~IG. 2, a V-shaped gap is formed between the
blades 42 and 52 when the protuberances 22 and 32 of the first toggle 20
and the second toggle 30 are pressed against each other. In case of such
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an incident as described above, the first adjusting screw 80 is first
unfastened before the second adjusting screw 82 is turned to force the
second support arm 26 to swing toward another side so as to cause an
increase in distance between the first and the second pivoting members
121 and 141 which are pivoted with the first toggle 20. As a result, the
first jaw 40 is actuated to swing such that the blade 42 is caused to
swivel until the blade 42 is parallel to the blade 52 of the second jaw 50.
However, there may be still a gap located between the blades 42 and 52,
as illustrated in FIG. 3. The gap can be elimin~ted by adjusting the
locating bolts 62.
In case of an incident in which an inverted V-shaped gap (not
shown in the drawings) is formed between the blades 42 and 52 when
the protuberances 22 and 32 of the first and the second toggles 20 and 30
are pressed against each other, the second adjusting screw 82 is first
unfastened before the first adjusting screw 80 is turned to force the
second support arm 26 to swivel toward the first support arm 24 so as to
bring about a decrease in distance between the first and the second
pivoting members 121 and 141. As a result, the first jaw 40 is actuated to
swing to elimin~te, in conjunction with the adjusting of the locating
bolts 62, the inverted V-shaped gap located between the blades 42 and
52.
It must be pointed out here that the first and the second adjusting
screws 80 and 82 have both adjusting function and locating function. For
instance, when the first adjusting screw 80 is adjusted to actuate the
second support arm 26 to swivel to locate at an appropriate position, the
second adjusting screw 82 can be turned to urge the second support arm
26 in an opposite direction so as to prevent the first adjusting screw 80
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from being unfastened or disengaged at the time when the metal shears
10 of the present invention is at work. In other words, the second
adjusting screw 82 has the function of locating the first adjusting screw
80, and vice versa.
