METAL SCISSORS WITH GEARS AND GEAR BAR SYSTEM

CISEAUX A METAL A ENGRENAGES ET DISPOSITIF DE CREMAILLERE

English Abstract

The invention provides an improved drive system of metal scissors. The drive system includes gears and gear bar. Traditionally metal scissors are lever system. Two arms of metal scissors are pushed and cutting edges close and cut metal sheet. The improved metal scissors cut metal sheet by pushing the arm and master arm. The master +arm of metal scissors drives the gears and gear bar. The gears and gear bar run and move the cutting edges of metal scissors. Then the metal scissors cut the metal sheet. The improve metal scissors increase to cut thicker thickness of metal sheet than traditional metal scissors. It is easier for the improved metal scissors to cut metal sheet than traditional metal scissors.

French Abstract

La présente invention fournit un système dentraînement amélioré de ciseaux à métal. Le système dentraînement comprend des engrenages et une barre dengrenage. Habituellement, les ciseaux à métal sont montés sur un système de levier. Deux bras de ciseaux à métal sont poussés et les tranchants se referment et coupent une feuille de métal. Les ciseaux à métal améliorés coupent une feuille de métal en poussant le bras statique et le bras dynamique. Le bras statique et le bras dynamique des ciseaux à métal actionnent les engrenages et la barre dengrenage. Les engrenages et la barre dengrenage sont activés et font bouger les tranchants des ciseaux à métal. Les ciseaux à métal coupent alors la feuille de métal. Les ciseaux à métal améliorés permettent de couper des feuilles de métal plus épaisses quavec les ciseaux à métal conventionnels. Il est plus facile de couper des feuilles de métal avec les ciseaux à métal améliorés quavec des ciseaux à métal conventionnels.

Claims

5
Claims
1. A pair of scissors, comprising:
a first arm having a first cutting edge at a distal end of first arm and a
first
handle at a proximal end;
a second arm moveable in relation to the first arm, the second arm comprising
a
master arm and a passive arm, the master arm having a first sub-arm defining
a first opening and a second sub-arm defining a second opening, the passive
arm pivotably connected to the first arm at a bolt, the second arm having a
second cutting edge at a distal end of the passive arm, and a second handle at
a
proximal end of the master arm;
a drive system comprising one or more gears placed between the first arm and
the second arm and a gear bar secured to the passive arm; and
a shaft located on the second arm and spaced apart from the bolt, the shaft
comprising a first spline, a second spline and a first gear between the first
spline
and second spline, the first spline securely received in the first opening,
the
second spline securely received in the second opening, and the first gear
meshed with one of the plurality of gears of the drive system, wherein a
proximal end of the passive arm pivotably connected to a distal end of the
master arm at the shaft,
wherein when the proximal end of the first handle and the proximal end of the
master arm are pushed towards each other from an open position in which the
first and second cutting edges are spaced apart from each other, pivotal
movement of the master arm and the shaft with respect to the passive arm is
converted to rotation of the one or more gears of the drive system and
movement of the gear bar to drive the passive arm to a closed position in
which
the first and second cutting edges are in close proximity with each other.
2. The pair of scissors of claim 1, wherein the drive system comprises 5 or 7
gears.
Date recue / Date received 2021-11-03

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3. The pair of scissors of claims 1 or 2, wherein the first gear has a biggest

diameter than the plurality gears of the drive system.
4. The pair of scissors of any one of claims 1 to 3, wherein one of the
plurality of
gears is coupled to the gear bar such that rotation of the one of the
plurality of
gears causes the downward movement of the gear bar to drive the passive arm
to the closed position.
5. The pair of scissors of any one of claims 1 to 4, wherein when the first
and
second handles are pulled away from each other from the closed position,
pivotal movement of the master arm with respect to the passive arm at the
shaft is converted to rotation of the one or more gears and movement of the
gear bar to drive the passive arm to the open position.
6. The pair of scissors of any one of claims 1 to 5, further comprising a top
cover
and a bottom cover mounted to at least one of the first arm and the second arm

for supporting the drive system placed between the first arm and the second
arm.
7. The pair of scissors of any one of claims 1 to 6, further comprising a
support
holder that comprises four legs, a spring, a close limit stopper, and an open
limit stopper, wherein one end of the four legs and the spring are pivotably
connected by a first riveting bolt, another end of two legs pivotably
connected
to the close limit stopper by a second riveting bolt, and the another end of
remaining two legs pivotably connected to the gear bar by a third riveting
bolt,
and the open limit stopper pivotably connected to middle portions of the four
support legs by a third riveting bolt.
8. The pair of scissors of claim 7, wherein the spring is mounted between the
close
limit stopper and the gear bar, each of the close limit stopper and the gear
bar
having a bore for receiving an end of the spring.
9. The pair of scissors of any one of claims 1 to 8, further comprising a
locker for
locking the pair of scissors in the closed position.
Date recue / Date received 2021-11-03

Description

1
METAL SCISSORS WITH GEARS AND GEAR BAR SYSTEM
Background of The Invention
Traditional metal scissors are lever system. There are 2 arms in the metal
scissors. When
arms are pushed, cutting edges close and cut metal sheet. Metal sheet is used
great effort
to be cut by hand, especially thick metal sheet.
Summary of The Invention
Drive system of metal scissors according to the invention are gear system that
includes the
gears and gear bar. When the arms of metal scissors are pushed, the arms of
metal
scissors run to close and make the gears and gear bar operate. The cutting
edges close
and cut the metal sheet. The gears and gear bar system of metal scissors are
easier to cut
metal sheet, especially thick metal sheet than traditional lever system of
metal scissors.
Brief Description of Drawings
Fig. 1A is a front view of metal scissors, according to an embodiment of the
present
application;
Fig. 1B is a top view of the metal scissors in Fig.1A;
Fig. 2A is a front view of shaft of the metal scissors in Fig. 1A;
Fig. 2B is a top view of shaft in Fig. 2A;
Fig. 3A is a top view of the master arm of the metal scissors in Fig.1A;
Fig. 3B is a side view of the master arm in Fig. 3A;
Fig. 4A is a top view of support legs and a spring of the metal scissors in
Fig. 1A;
Fig. 4B is a side view of the support legs and spring in Fig. 4A;
Fig. 5A is a top view of an open limit stopper of the metal scissors in Fig.
1A;
Fig. 5B is a side view of the open limit stopper in Fig. 5A;
Fig. 6A is a top view of a close limit stopper of the metal scissors in Fig.
1A;
Fig. 6B is a side view of the close limit stopper in Fig. 6A;
Date recue / Date received 202 1-1 1-03

2
Fig. 7A is a top view of a close limit stopper and gear bar of the metal
scissors in Fig. 1A;
Fig. 7B is a side view of the close limit stopper and gear bar in Fig. 7A.
Detailed Description of The Invention
In the drawings, which form parts of this specification,
Figs. 1A and 1B illustrate metal scissors with gears and gear bar. In the
particularly
advantageous embodiment of the invention illustrated, metal scissors comprise
master arm
1, passive arm 2, cutting edges 3, arm 4, support leg 5, open limit stopper 6,
close limit
stopper 7, close limit stopper and gear bar 8, gear 9, cover 10, spring 11,
locker 12, first
bolt 13, shaft 14, second bolt 15, and gear 16.
As seen in Figs. 1A and 1B, the locker 12 unlocks the metal scissors arms 1,
2, 4, which
are opened by spring 11. Opening of the arms 1, 2 and 4 also causes two
cutting edges 3
opened and apart from each other via the first bolt 13. Open limit stopper 6
stops the
scissors from continuing to open when the scissors are opened to the maximum
extent
permitted by the open limit stopper 6. When master arm 1 is pushed to close,
for example
by a user, gears 9 and gear bar 8 start operating. Cutting edges 3 is caused
to pivotally
close about the first bolt 13 and cut a metal sheet. Cutting edges 3 are
stopped by close
limit stopper 7 when the extent of close reaches the maximum extent permitted
by the
close limit stopper 7 and close limit stopper and gear bar 8.
Passive arm 2 and arm 4 are connected by first bolt 13. There are 5 or 7 gears
in a gear
system. The number of the gears is depended on length of arm 4. Seven gears
are used in
a long length of arm 4. As seen in the example of Fig. 1A, there are 5 gears
in the gear
system. The diameter of the gear 16 mounted on the shaft 14 is bigger than the
diameter of
the others.
There are 4 support legs 5 in the support holder. As illustrated in Figures 4A
and 4B, one
side of 4 support legs 5 and spring 11 are connected by a riveting bolt. The
support legs 5
and spring 11 do free movement. The other side of 4 support legs 5 connect to
close limit
stopper 7 and close limit stopper and gear bar 8 by riveting bolts. 2 support
legs connect to
close limit stopper 7 and do free movement. 2 support legs connect to close
limit stopper
Date recue / Date received 2021-11-03

3
and gear bar 8 and do free movement. Open limit stopper 6 connects to the
middle of
support legs 5 by riveting bolts. Spring 11 opens the arms 1, 2, 4, and
cutting edges 3.
When the open limit stopper 6 touches middle of the support leg 5, the arms 1,
2, 4, and
cutting edges 3 stop opening. When the arms 1, 2, 4, and cutting edges 3
close, and when
close limit stopper 7 and close limit stopper and gear bar 8 touch middle of
the support leg
and stop closing.
There are 2 covers 10 in the gear system. The covers 10 support gears 5 and
locker 12.
There are 2 holes in the close limit stopper 7 and the close limit stopper and
gear bar 8
each hole for receiving a leg of the spring 11. The 2 legs of spring 11 do
free movement in
the holes. As seen in Fig 1A, in passive arm 2, this is an open type
connection in the
passive arm. When passive arm 2 connects to the shaft 14, the passive arm 2
and the
master arm 1 are connected with each other via the shaft 14. The passive arm 2
and the
shaft 14 may be secure by screws.
As seen in Fig. 2A, in the shaft 14, 3 splines 14a, 14b and 14c are configured
to be formed
on the shaft 14. The shaft 14 includes shaft portions 14d, 14e for receiving
arm 2. 2 splines
14a and 14b connect to master arm 1. Passive arm 2 connects to the shaft
portions 14d
and 14e.
As seen in Figs.1A, 1B, 2A, 2B, 3A and 3B, master arm 1 includes a first sub-
arm la, and
a second sub-arm lb. The first sub-arm la has a first opening lc, and the
second sub-arm
lb has a second opening ld. The opening lc is configured to receive and mesh
with the
spline 14a, and the opening ld is configured to receive and mesh with the
spline 14b. The
gear 16 may be placed between the first sub-arm la and second sub-arm lb. When
the
shaft 14 with splines 14a, 14b and 14c penetrates into the openings 1 c and
ld, the gear 16
is configured to mesh with the spline 14c and with one of the gears 9, as
illustrated in FIG.
2A. Passive arm 2 has two ends 2a and 2b (see FIG. 1B) attaching to
respectively shaft
portions 14d, 14e. In the example of FIG. 1B, the two ends 2a and 2b of the
passive arm 2
attach to respectively shaft portions 14d, 14e, and Gland 19 and gland 17 are
configured
to respectively connect to shaft portions 14d and 14e. The two ends 2a and 2b
respectively
connects to gland 19, 17 by bolt 20, 18. When master arm 1 connects to the
shaft 14, the
master arm 1 and the shaft 14 may be secured by screws, as illustrated in Fig.
1B.
Date recue / Date received 2021-11-03

4
As seen in Figs. 4A and 4B, in the support holder, there are 4 support legs 5
and a spring
11. Spring 11 makes arm 4 and passive arm 2 open.
As seen in Figs. 5A and 5B, in the open limit stopper 6, support legs 5
connect to open limit
stopper 6 by riveting bolts.
As seen in Figs 6A and 6B, in the close limit stopper 7, support legs 5
connect to close limit
stopper 7 by riveting bolts. There is a hole in close limit stopper 7. Leg of
spring 11 do free
movement in the hole. Close limit stopper 7 connects to passive arm 2 by
welding.
Figs 7A and 7B illustrate an example of a close limit stopper and gear bar 8.
The close limit
stopper and gear bar 8 connects to arm 4 by welding. Support legs 5 connect to
close limit
stopper and gear bar 8 by riveting bolts. There is a hole in close limit
stopper and gear bar
8. Leg of spring 11 do free movement in the hole.
Date recue / Date received 202 1-1 1-03

Representative Drawing