JPH0112956Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a removable needle pusher that is attached to a stapler magazine.

(Prior Art) Conventionally, most of the removable needle pushing devices installed in stapler magazines, which have been widely used in general, have a needle pushing device 1 as shown in FIG.
At the base end of the compression spring guide bar 2, which is made of a slender round rod and has a shaft shape, there is a needle pusher 1 drilled in the bottom wall of the base end of the magazine for locking. A knob 5 equipped with a hook 7 that engages and locks on the edge of the hole is attached so that it can be rotated but cannot be pulled out, and the distal end has a tip surface that serves as an engagement surface 6 with the staple. While the pusher 3 is attached so that it can be slid and rotated but cannot be removed, the shaft-like portion of the shaft-shaped compression spring guide bar 2 between the knob 5 and the pusher 3 is designed in consideration of handling problems. The shaft-shaped portion has a relatively small diameter, and is wound with a compression spring 4 for pushing the pusher, the inner diameter of which is relatively larger than the outer diameter.

Then, the staples are inserted between the magazine and the staple guide on the base end side of the magazine, and then the staples are pushed toward the front end side of the magazine with the pusher 3, and then the hook 7 is inserted. The magazine is fixed by being engaged with the edge of a locking hole provided at the base end of the magazine.

(Problem to be solved by the invention) Therefore, the more staples are loaded, the more the compression spring 4 is compressed, and the compressed spring 4 is compressed by the shaft-shaped spring guide. The axial portion of the bar 2 is meandering, with some parts being significantly shortened and others not so much, resulting in an uneven overall state. If this state continues for a long time, the compression spring 4 loses its initial pushing force, which poses a disadvantage or disadvantage in that it becomes difficult to feed the staples satisfactorily.

On the other hand, when gripping the knob 5 and attempting to insert the needle pusher 1 into the magazine, the knob 5 with the hook 7 and the pusher 3 are both attached to the shaft-shaped spring guide bar 2. Since it is rotatably mounted, the engagement surface 6 of the pusher 3 can be engaged with the staple since the knob 5 and the staple engagement surface 6 of the pusher 3 are rarely aligned. There was also the operational inconvenience of having to make relative positional adjustments such as rotating the knob 5 in this manner.

In view of the above-mentioned difficulties, drawbacks, and inconveniences, the present invention has been developed so that the compression spring for pushing the pusher, in other words, for pushing the staples, does not get fatigued over a long period of time, regardless of the loading state of staples, and the magazine The object of the present invention is to provide a needle pushing device for a stapler that does not require relative positional adjustment between the knob and the pusher by rotating the knob when the stapler is inserted into and locked.

(Means for solving the problem) The needle pushing device for the stapler according to the present invention has the following features:
In order to achieve the above purpose, the cross-sectional shape is an inverted U.
At the base end of the compression spring guide bar, which can form a letter shape,
The stapler is integrally provided with a locking part that locks into the locking part of the needle pusher provided on the proximal end side of the magazine, and the tip of the stapler is provided with a locking part that locks the locking part of the stapler. A pusher for pushing staples within the magazine in a state where it is locked and locked in the device locking portion is slidable along the compression spring guide bar, but is mounted so that it cannot be rotated or pulled out. On the other hand, a compression spring for pushing the pusher is wound around the compression spring guide bar between the engagement part and the pusher, and a knob is fixed to the upper part of the engagement part. This is a characteristic feature.

(Function) The needle pusher in the stapler according to the present invention has the following features:
As configured as described above, the compression spring guide bar with an inverted U-shaped cross section has a lower weight than the conventional compression spring guide bar made of a round rod and having an axial shape. Since the increase is small and the outer diameter is large, there is no inconvenience in handling, and meandering of the compression spring for pushing the pusher can be avoided.

In addition, both the locking part and the pusher cannot be rotated with respect to the compression spring guide bar, and their relative positions are determined, so when the needle pusher is inserted into the stapler magazine and locked. for,
The relative positional relationship between the knob and the pusher fixed to the upper part of the engaging part becomes unnecessary.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5, which illustrate embodiments of the present invention.

First, each component will be explained with reference to FIG. 1, which is a schematic longitudinal sectional front view for explaining each component of a stapler equipped with a stapler pushing device according to the present invention. is rotatably supported on a base 71, as in the conventional type, and has a needle pusher 10 on the bottom wall on the proximal end side.
(See Figures 2 and 3) Magazine 7 equipped with locking holes 74 and 74 (see Figure 4) as locking and locking parts
3, a magazine unit 72 consisting of a staple guide 75, etc., a handle unit 76, a driver unit 77, etc., and 10 is a staple pushing device according to the present invention, which will be described later with reference to other drawings. The proximal end side is provided with hooks 25, 25 as an engaging part and a widening part 22 with a long hole for fixing the knob, in which a long hole 26 for fixing the knob is formed, and the pusher is pulled out on the distal end side. Prevention piece 2
7, 27, a compression spring 40 for pushing the pusher is wound between these two parts, and a compression spring guide bar 20 supports the pusher 30 in a slidable but non-rotatable manner; The compression spring 40 and the decorative cover part 60 are integrally molded, and the knob 50 is made of synthetic resin or the like and is fixed using the long hole 26 for fixing the knob.

That is, the compression spring guide bar 20 is made of an elongated |--shaped sheet metal whose one end, which is the proximal end, is slightly wider.As can be seen especially from FIG. The compression spring wrapping bar part 21 is formed by curving in the longitudinal direction into a U-shape, and then by this curving, the legs on both sides are formed with slightly wider parts on the proximal end side. Both hanging parts connected to the horizontal step parts 23, 23 are formed by bending the parts outward and vertically bending the outward bent parts of both the open leg parts downward from the middle. The interval between the legs 24, 24 is widened to make the cross-sectional shape square, and the base end of the magazine 73 is attached to both the hanging legs 24, 24 with the widened interval, as shown in FIG. Hooks 25, 25 are respectively formed as a locking part to be locked to the rear hole edge of the locking holes 74, 74 as a locking part for locking the needle pusher provided at the bottom of the side, and From the top, there is a hook/opening section 22 with a long hole for fixing a knob formed with a long hole 26 for fixing a knob in a direction perpendicular to the longitudinal direction.
On the other hand, as shown in FIG. 4, on the tip end side, there is a pusher for preventing the pusher from being pulled out, which is bent outward after insertion into mounting holes 34 and 35 formed in the pusher 30, which will be described later. piece 27, 27
It is composed by forming .

Further, as shown in FIGS. 2, 3, and 4, the pusher 30 is made by bending a substantially horizontally long rectangular sheet metal so that the cross-sectional shape becomes a shape, and serves as a stable guide for the magazine unit 72 in the stapler main body 70. The top plate portion 31 is slidable on the bar 75.
Sliding holes 34 and 35 having a shape that matches the cross-sectional shape of the compression spring winding bar portion 21 of the compression spring guide bar 20 are concentrically formed in the tongue pieces 32 and 33 bent and suspended from the spring guide bar 20. Through these sliding holes 34 and 35, the compression spring winding bar portion 21 is slidably but unrotatably mounted, and is bent outward after mounting. By the pieces 27, 27 for preventing the pusher from being pulled out,
It has become impossible to extract it.

Further, the compression spring 40 is equivalent to a conventional compression spring of this type, and the knob 50 is usually made of synthetic resin and is preferably integrally molded. As is clear from the figure,
Rear end wall 51 with reinforcing edges 52, 52 on both sides
and the reinforcing edges 52, 52 and a series of reinforcing edges 5.
4, 54, and has a decorative cover 60 extending thereon, which covers the base end side of the magazine unit 72 together with the reinforcing edges 54, 54.
3, it has a U-shape when viewed from above and below, and the rear end on the release side is attached to the rear end wall 51, and the upper end is attached to the upper end plate section 5.
3, and fixes the knob 50 to the compression spring guide bar 20 using a groove 56 for inserting a compression spring winding bar part described later and the long hole 26 for fixing the knob. It is formed of a cylindrical part 55 for inserting and fixing a hook/knob with a long hole for fixing a hook and knob, and a connecting member 58 for fixing the hook/knob.

By the way, the compression spring winding bar part insertion groove 56 in the cylindrical part 55 for inserting and fixing the expanded part with the elongated hole for fixing the hook/knob is formed in the front wall 57 thereof, and the connecting member 58 is When the enlarged part 22 with the long hole for fixing the hook and knob is inserted into the cylindrical part 55 (the knob 50 is fixed as shown in FIG. 5,
When it is turned over, the compression spring guide bar 20 shown in FIG. 4 is also turned over, and the compression spring winding bar portion 21 is inserted into the groove 56. ) is integrally formed in the cylindrical portion 55 in parallel with the rear end wall 51 so as to protrude through the long hole 26 for fixing the knob. And this connecting member 5
8 is inserted into the knob fixing elongated hole 26 as described above, and the protruding portion thereof is caulked to form the caulked portion 61 (see FIGS. 2 and 3), whereby the knob 50 is compressed. It is fixed to the spring guide bar 20. Note that 59, 59 connect the rear end wall 51 and the front wall 5 on both sides of the groove 56 with the connecting member 58 in between.
The horizontal step receiving rib of the widened part 22 with long holes for fixing the hook/knob extends in parallel with the bar part 21 for winding the compression spring at the top of the widened part 22. A groove for fitting the inverted U-shaped portion formed in the groove is also formed.

The needle pushing device 10 of the present invention, which is assembled and molded by the above-mentioned members as shown in FIGS. 2 and 3 in particular, is as shown in FIG. 1 (staples are omitted). , similar to the conventional needle pusher,
The compression spring guide bar 20 in the staple pushing device 10 according to the present invention, which is used by being attached to the stapler main body 70, has a cross-sectional shape of an inverted U.
Since it is shaped like a letter, it is strong, so compared to the conventional compression spring guide bar made of a round rod and shaped like a shaft, its outer diameter can be made larger and closer to the inner diameter of the compression spring 40. , since its weight is not very heavy, there is of course no inconvenience in handling caused by the weight of the staple pushing device 10 itself, and the compression spring 40 is loaded with a considerable amount of staples. Even when the needle pusher is moved, its tendency to meander is extremely small and a substantially uniform compression state can be maintained. The disadvantages of early loss can now be eradicated.

Further, the knob 50 is fixed to the base end side of the compression spring guide bar 20, and the pusher 30 is attached to the compression spring guide bar 20, that is, the compression spring wrapping bar portion 21.
Although the needle pusher 10 is attached to the main body 70 of the stapler body 70, the conventional knob or pusher is attached to the compression spring guide. Unlike those that are rotatably attached to the bar, there is no need to adjust the relative position or rotate the knob to determine the position of the hook and its locking hole. It became possible to immediately grasp the knob 50 and insert it into the stapler body 70 and lock it there.

Furthermore, the knob 50 to the compression spring guide bar 20
For fixing, the former hook/knob fixing widened part 22 with long holes is inserted into the latter hook/knob fixing widened part 55 with long holes, Since the protruding portion of the latter connecting member 58 inserted through the former knob fixing elongated hole 26 and protruding is caulked and fixed, the fixed state of both can be maintained without loosening even over a long period of time. It became.

(Effects of the invention) As is clear from the above-mentioned effects, according to the invention, the compression spring that is wound around the compression spring guide bar for pushing the pusher, in other words, for pushing the staple, can be used regardless of the loaded state of staples. The spring does not get fatigued over a long period of time, and when inserting and locking the stapler body into the magazine, the relative position of the knob and pusher is adjusted by rotating the knob. Furthermore, it has become possible to provide a needle pushing device for a stapler that does not require relative positional adjustment between the hook of the knob and the locking hole on the stapler body side.

[Brief explanation of the drawing]

FIGS. 1 to 5 show an embodiment of the needle pushing device for a stapler according to the present invention, and FIG.
Fig. 1 is a schematic longitudinal sectional front view for explaining each component of the stapler equipped with the needle pushing device of the present invention, Fig. 2 is a longitudinal sectional front view of the staple pushing device of the present invention, and Fig. 3 is a view from the bottom of the stapler. 4 is a partially cutaway exploded perspective view for explaining the main components, and FIG. 5 is a rear view for explaining how to assemble and fix the compression spring guide bar and knob. FIG. 6 is a vertical sectional front view of a conventional needle pusher. 10: Needle pushing device, 20: Compression spring guide bar, 21; Compression spring winding bar section, 22; Expanding section with long holes for fixing hook/knob, 23; Horizontal step section, 24; Hanging leg section, 25 ; Hook, 26; Long hole for fixing the knob, 27; Piece for preventing the pusher from being pulled out;
30; pusher, 31; top plate part, 32, 33;
Tongue piece, 34, 35; sliding hole, 40: compression spring;
50: Knob, 51; Rear end wall, 52, 54; Reinforcing edge, 53; Upper end plate portion, 55; Cylindrical portion for inserting and fixing the expanded part with a long hole for fixing the hook/knob, 56; Compression spring Guide bar insertion groove, 57; Front wall, 58; Connecting member, 59; Horizontal stepped portion receiving rib, 60; Decorative cover, 61; Caulking portion, 70: Staple main body,
71; base; 72; magazine unit; 73; magazine; 74; locking hole as a portion for locking and locking the needle pusher; 75; staple guide; 76; handle unit; 77; driver unit.

Claims (1)

[Scope of utility model registration request] The base end of the compression spring guide bar, which has an inverted U-shaped cross section, has a locking mechanism that locks into the locking section of the needle pusher provided on the base end side of the magazine in the stapler. The parts are integrally provided,
Further, a pusher that pushes the staples within the magazine can slide along the compression spring guide bar in the state where the locking part is locked with the locking part of the needle pusher. However, while the compression spring guide bar is attached so that it cannot be rotated or removed, a compression spring for pushing the pusher is wound around the compression spring guide bar between the engagement portion and the pusher, and a compression spring is wound around the compression spring guide bar for pushing the pusher between the engagement portion and the pusher. This is a needle pushing device for a stapler, characterized in that a knob is fixed.