The present invention relates to a stapler for fastening papers or the like.
Patent Reference 1: U.S. Pat. No. 6,145,728
An object of the present invention is to provide a stapler for fastening papers or the like, which can perform a proper stapling operation even though a handle thereof is given smaller force. Another object of the present invention is to provide a stapler which can perform a strong stapling operation even though a handle thereof is given smaller force.
Another object of the present invention is to provide a stapler having fewer parts and simple structure.
Yet another object of the present invention is to provide a stapler which prevents an accident that staples are coming out due to strong force to pushing out staples when refilling staples. In other word, it is an object to provide a stapler having a structure in which a mechanism to push out staples does not function when refilling staples.
A stapler for fastening papers or the like, which can perform a proper stapling operation even though a handle thereof is given smaller force had always been desired. Until today, many prior arts were disclosed as the mechanism to solve such problem.
A stapler, so called Tacker system stapler, which needs smaller force to staple is described in U.S. Pat. No. 6,145,728. However, the stapler described in U.S. Pat. No. 6,145,728 has a structure in which a base is opened under the condition that staples is being pushed by a feeder when refilling staples. Therefore, it is very dangerous that staples protrude due to the fall down of the handle. In addition, if a stapler can strike staples with stronger force than the one of the stapler described in U.S. Pat. No. 6,145,728, it is better in the point that the volume of an object to be fasten can be increase.
One aspect of the invention provides a stapler comprising a handle member, a frame member of which a rear end is pivotably attached to the handle member, a base member of which a rear end is pivotably attached to the frame member and on which is mounted a guide member, a feeder member which is linked to the guide member via spring, and pushes a staple which slides along the guide forward by engaging a rail provided on the frame member and sliding back and forth with spanning the guide member, a driver spring member of which one end is attached to a blade member and another end is attached to the frame member, a toggle mechanism having a joint a of which one end is a fulcrum shaft A and another end is a fulcrum shaft B, and a joint b of which one end is a fulcrum shaft B and another end is a fulcrum shaft C, the other end of the joint a is pivotably attached to one end of the joint b, a puller member of which the one end engages the fulcrum shaft B, and a trigger member of which one end is pivotably attached to the handle member and the distal of another end engages the puller member, wherein the driver spring member engages the fulcrum shaft A at a place between one end thereof and another end thereof, the trigger member rotates to push the puller member forward due to the pushing down of the handle, the fulcrum shaft B moves due to the going forward of the puller member, consequently a distance between the fulcrum shaft A and the fulcrum shaft C increases, in accordance with this, one end of the driver spring moves to the upper side to save power in the driver spring, further pushing down of the handle releases the engagement between the dismal of the trigger member and the puller member and the power saved in the driver spring is temporally released to lift down the fulcrum shaft A, and the lifting down of the fulcrum shaft A lifts down the blade attached to one end of the driver spring.
By the engagement between the guide member and the base member, when refilling staples, the base and the guide integrally open. This prevents a staple going out due to an accidental lifting down of the handle.
Another aspect of the invention provides the stapler in which the trigger member rotates to push the puller member backward due to the pushing down of the handle, the fulcrum shaft B moves backward due to the rearward movement of the puller member, consequently a distance between the fulcrum shaft A and the fulcrum shaft C increases. This mechanism is described in such as Embodiment 1.
Yet another aspect of the invention provides the stapler in which the fulcrum shaft B is always located forward of a line linking the fulcrum shaft A and the fulcrum shaft C.
The fulcrum shaft B is always located forward of a line linking the fulcrum shaft A and the fulcrum shaft C means a condition that the toggle mechanism is in V-shape with being opened rearward in the side view as shown in
Yet another aspect of the invention provides the stapler in which a lower side projection is provided forward of the distil of the other end of the trigger member, the lower side projection of the trigger member keeps the engagement with the puller member continuously even after the engagement between the distil of the trigger member and the puller member is released, the extinguishment of the force for pushing down the handle lifts up the forward of the handle, in accordance with the lifting up of the forward of the handle, the trigger member rotates around one end of the trigger member to lift down another end of the trigger member, in accordance with the lifting down of the other end of the trigger member, the position of the engagement between the trigger member and the puller member moves forward, and the distil of the trigger member engages the puller member again.
The term “another end” of the trigger member is used as a word corresponding to “one end” of the trigger member. That is, it is the one of two ends of the trigger member that is not pivotably attached to the handle. The term “lower end” refers to an end positioned at the lower side when the trigger member is specified in the condition shown in
Another aspect of the invention provides the stapler in which the trigger member rotates to push the puller member forward due to the pushing down of the handle, the fulcrum shaft B moves forward due to the forward movement of the puller member, consequently a distance between the fulcrum shaft A and the fulcrum shaft C increases. This mechanism is described in such as Embodiment 2.
Yet another aspect of the invention provides the stapler in which the fulcrum shaft B is always located rearward of a line linking the fulcrum shaft A and the fulcrum shaft C.
The fulcrum shaft B is always located rearward of a line linking the fulcrum shaft A and the fulcrum shaft C means a condition that the toggle mechanism is in V-shape with being opened forward in the side view as shown in
Another aspect of the invention provides the stapler in which the lower side projection is provided rearward of the distil of the other end of the trigger member, the lower side projection of the trigger member keeps the engagement with the puller member continuously even after the engagement between the distil of the trigger member and the puller member is released, the extinguishment of the force for pushing down the handle lifts up the forward of the handle, in accordance with the lifting up of the forward of the handle, the trigger member rotates around one end of the trigger member to lift down the other end of the trigger member, in accordance with the lifting down of the other end of the trigger member, the position of the engagement between the trigger member and the puller member moves forward, and the distil of the trigger member engages the puller member again.
According to the present invention, a stapler which can perform a proper and stronger stapling operation with smaller force is provided. In other words, a toggle mechanism converts a smaller force for pushing a handle to a stronger force for striking a blade, which results in a proper and stronger stapling operation.
Furthermore, fewer parts and simple structure reduce the production cost.
Moreover, when refilling staples, it is safety since a structure in which a mechanism for pressing out staples does not function.
To explain the present invention, a side where a blade is positioned refers to “forward”, a side where a base and a frame, and the frame and a handle are pivotably attached refers to “rearward”, a side the handle is positioned refers to “upper side”, and a side the base is positioned refers to “lower side”.
A schematic view of a stapler with respect to Embodiment 1 is as shown in
A feeder-frame engaging unit 42 of the feeder 40 engages a rail mechanism of an inner wall of the frame (not shown in the figure), and the feeder slides back and forth along the rail mechanism. A spring is provided at a place between a feeder-spring engaging unit 41 provided on the feeder and a guide-spring engaging unit 46 provided on an inner wall of the guide (not shown in the figure). The feeder 40 is mounted so as to span the guide 45, and is placed at the side where the staple towards by the force of the spring.
Referring to
A toggle mechanism 50 is pivotably attached to an upper side projection 31 of the driver spring 30. The toggle mechanism 50 includes a joint A 51 and a joint B 52, the joint B 52 is pivotably attached to the joint A 51 by a toggle shaft 54. The joint A 51 is pivotably attached to the driver spring 30 by a toggle driver spring shaft 53, and the joint B 52 is pivotably attached to the inner wall of the frame 4 by a toggle frame pin 55. A puller 20 is pivotably attached to the toggle shaft 54. The puller 20 has a stopper 22 on the upper surface thereof.
A trigger 10 is pivotably attached to the inner wall of the handle 3. The trigger 10 has a base member 11 pivotably attached to the handle 3, a tongue A 12 which is going to engage the stopper 22 of the puller 20 by operation, and a tongue B 13 which is going to engage the upper surface of the puller 20 by operation. A torsion spring is provided at a place between the upper surface of the trigger 10 and the inner wall of the handle 3 (not shown in the figure). Due to the torsion spring, a force setting apart the trigger 10 and the handle 3 work.
In the condition shown in
And then, by stopping pushing down the handle in the direction indicated by the arrow A, the stapler returns to the condition before operation (
Referring to
The feeder-frame engaging unit 42 of the feeder 40 engages a groove 82 on the inner wall of the frame, and the feeder 40 slides fore and rear direction along the groove 82. A spring (not shown in the figure) is provided at a place between the feeder-spring engaging unit 41 provided on the feeder and the guide-spring engaging unit 46 provided on the inner wall of the guide. The feeder 40 is mounted so as to span the guide 45, and is placed at the side where the staple towards by the force of the spring.
The rearward portion of the driver spring 30 is fixed with screws to the frame 4. Apertures 78 for screws are provided on the frame 4. The driver spring 30 is comprised of flexible material and functions as a blade spring. A forward projection 32 of the driver spring 30 engages a blade opening 36 of the blade 35, which allows the blade 35 to move together with the driver spring.
A toggle mechanism 50 is pivotably attached to the upper side projection 31 of the driver spring 30. The toggle mechanism 50 includes a joint A 51 and a joint B 52, and the joint B 52 is pivotably attached to the joint A 51 by a toggle shaft 54. The joint A 51 is pivotably attached to the driver spring 30 by a toggle driver spring shaft 53, and the joint B 52 is pivotably attached to the hole 76 of the inner wall of the frame 4 through a trigger shaft 74. The both ends 65 of the toggle shaft 54 engage a fore end 63 of a pusher 60, and the pusher 60 has a stopper 62 on the upper surface thereof.
A trigger 70 is pivotably attached to the inner wall of the handle 3. The trigger 70 has a base member 71 pivotably attached to the handle 3, a tongue A 72 which is going to engage the stopper 62 of the pusher 60 by operation. A torsion spring is provided at a place between the upper surface of the trigger 70 and the inner wall of the handle 3 (not shown in the figure). Due to the torsion spring, a force setting apart the trigger 70 and the handle 3 works.
Just after the condition shown in
And then, by stopping pushing down the handle in the direction indicated by the arrow A, the stapler returns to the condition before operation (
It is usable for a stapler for fastening papers or the like. It can be used for not only an existing type stapler which is refilled only staples but also a cassette type stapler of which staples and a staple magazine is integrated.
Number | Date | Country | Kind |
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2005-050169 | Feb 2005 | JP | national |
2005-144784 | May 2005 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP06/03631 | 2/27/2006 | WO | 00 | 6/3/2008 |