DE29604189U1 - Clamp guiding device of a rivet gun - Google Patents

Description

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STAPLE ATTACHMENT DEVICE OF A RIVET GUN

The present invention relates to a staple guide device in a rivet gun, in particular for the use of both U-shaped staples and straight pins.

Conventional rivet guns are generally classified according to the staples used into those that use straight pins and those that use U-shaped staples. The structure of these two types of rivet guns is not the same, and both types of staples cannot be used interchangeably.

In conventional rivet guns for U-shaped staples, the size of the output guide device for the staples must exactly match the width of the U-shaped staples. Then the staples can be guided precisely to be shot into the work object. However, the guide device in such rivet guns is only adapted to one type of staple, so conventional rivet guns can only use U-shaped staples of one size.

Later, a rivet gun for using straight and U-shaped staples appeared (Taiwan Patent No. 82211011 "Improved staple holder in a rivet gun"). This rivet gun has a magazine for straight pins and U-shaped staples of different sizes. Its staple output guide device is also suitable for straight pins and U-shaped staples of different sizes. Therefore, straight pins and U-shaped staples of different sizes can be used in one and the same rivet gun.

Fig. 1 and 2 show the structure of the staple guide device of the rivet gun. This comprises: an upper holder 1, a lower holder 2, a limiting element 3 and an ejection plate 4. The lower holder is mounted on the magazine 5, its upper side is fastened to the upper holder 1. In the lower side of the upper holder 1 there is a vertically cut guide groove 6. When the upper holder 1 is fastened to the upper side of the lower holder 2, the guide groove 6 and the upper side of the lower holder 2 form an opening through which U-shaped staples of the maximum width used in the rivet gun are guided.

The staples in the magazine 5 of the rivet gun can be inserted into the guide groove 6 and are then shot into the work object with the help of the ejection plate 4.

The limiting element 3 has a main body 7 and a first and a second strip 8 and 9. The main body 7 can be attached to the upper holder 1, so that the first and the second strip 8 and 9 are located within the guide groove 6 parallel to it.

The first and second strips 8 and 9 are elastic and bent downwards. They press against the top of the lower holder 2.

This version of rivet gun can use different types of U-shaped staples of different sizes. When using U-shaped staples of the largest width, both sides of the guide groove 6 are used for guidance. When using U-shaped staples of the second largest or smallest width, one side of the U-shaped staples is used from the left or right side.

the guide groove 6, the other side is guided by the first or second strip. In this case, the U-shaped staples can also be guided and easily shot into the work object.
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This design of a rivet gun achieves the effect of using various kinds of U-shaped staples of different sizes. However, its limiting element 3 is made by punching and bending an elastic metal sheet, and its strips 8 and 9 are very slender. During heat treatment within the machining process, the two strips 8 and 9 are easily deformed and easily lose their dimensional accuracy. This means difficulty in manufacturing.

In addition, the strips 8 and 9 are bendable flexible bodies, so they easily deform when ejecting staples and their guiding stability is reduced. 20

This still results in a need to modify the Klaminer guide device in this rivet gun.

The inventor has taken these effects into account and, through careful development in conjunction with many years of experience in this field and after many experiments and improvements, has arrived at the present invention.

The guide device of the present invention has an upper holder and a lower holder which is connected to the magazine of the rivet gun, the upper holder being fixed as the lower holder. On the contact surface between the upper and lower holders

There is a guide groove to guide the U-shaped clamps that are shot into the work object.

The present invention comprises a reciprocal number of limiting elements suspended by hinges from the upper holder to replace the strips of conventional limiting elements. Their purpose is to guide, together with the guide groove, U-shaped brackets of various widths.

The limiting elements are non-deformable rigid elements. Their rear ends are hinged to the upper bracket and their front ends are inclined downwards and press down on the lower surface of the guide groove.

Furthermore, the upper holder is provided with a flexible element which exerts an elastic force on the limiting elements so that the front ends of the limiting elements are inclined downward in the normal state and can be moved upward when a U-shaped staple is ejected.

When the width of the U-shaped staples is less than the width of the guide groove, one side of the U-shaped staples rests on one side of the guide groove and the other side is guided by a limiter. This allows the rivet gun to use U-shaped staples that are narrower than the guide groove.
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The guiding effect of the limiting elements is similar to the guiding effect of the strips in conventional limiters, but the inflexible rigidity of the limiting elements ensures a stable guiding effect.

To connect the limiting elements to the upper holder: a hinge is used, and the limiting system is simplified into a rod-like structure. It is therefore easy to manufacture and does not bend easily during heat treatment, its dimensions are easy to control, and the precision is increased.

The main object of the present invention is to provide a staple guide device of a rivet gun of simple construction and easy manufacture.

Another object of the present invention is to provide a rivet gun guide device of stable construction and improved precision.

Further advantages, features and possible applications of the present invention emerge from the following description of embodiments in conjunction with the drawings.

Fig. 1 is an exploded view showing an embodiment of a staple guide device of a rivet gun.

Fig. 2 is a sectional view of the staple guide assembly of Fig. 1 installed in a rivet gun.
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Fig. 3 is an exploded view showing the staple guide device of the present invention.

Fig. 4 is a sectional view of the staple guide device of the present invention installed in a rivet gun.
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Fig. 5 is a sectional view showing the connection between the limiting member of the present invention and the upper and lower holders.
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Fig. 6 is a sectional view showing the U-shaped brackets of all sizes used in the present invention.

Fig. 7 to 9 are diagrams showing the movement of the

limiter of the present invention viewed from the front to demonstrate the operation of the limiter in ejecting all types of U-shaped staples.

Fig. 10 is a sectional view showing another variant of the limiting element of the present invention.

Fig: 11 to 13 are diagrams showing the successive stages of movement of the limiting element of Fig. 10 to demonstrate the manner of movement of the limiting element when ejecting a staple. 30

Fig. 3 and 4 show the structure of the staple guide device of the present invention. It comprises: a lower holder 20, an upper holder 30, an ejection plate 40, first and second limiting elements 50 and 60 and a flexible element 70.

The structure of the lower holder 20 and the structure of the lower holder of a conventional rivet gun are similar to each other, so no detailed description is required. The upper holder 30 is attached to the top of the lower holder. Its bottom is provided with a guide groove 31 at the contact surface with the lower holder. The bottom of the lower holder is connected to the magazine 5 of the rivet gun. The staples in the magazine can be brought to the top of the lower holder and inserted into the guide groove 31. The ejection plate 40 can be inserted into the guide groove 31 so that the staples are pushed out through the guide groove 31 and shot into the work object.

The upper holder 30 is provided on its upper side with two symmetrically arranged hinge bearings 32, which serve as a suspension for the first and second limiting elements 50 and 60. The first and second limiting elements 50 and 60 each have a hinge element 51 and 61. The hinge elements 51 and 61 can be mounted on the hinge bearings 32 using a hinge axis 33. The upper holder 30 has two holes 34 between the hinge bearings 32, in their position corresponding to the hinge elements 51 and 61 of the first and second limiting elements 50 and 60. This allows the hinge elements 51 and 61 to extend through the upper side of the upper holder 30 into the guide groove 31 on the underside of the upper holder 30. At the lower end of a hinge element 51 or 61 there is a guide element 52 or 62. The two guide elements 52 and 62 extend parallel to the guide groove 31 from the upper holder on their rear side into the guide groove 31.

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As shown in Fig. 3, 4 and 5, the guide groove 31 of the upper holder 30 is provided on its upper side with two receiving grooves 35, the position of which corresponds to that of the two guide elements 52 and 62. The size of the two receiving grooves 35 matches the size of the two guide elements 52 and 62, so that the two guide elements 52 and 62 can be accommodated therein.

As shown in Fig. 3, 4 and 5, the rear ends of the guide elements 52 and 62 of the first and second limiting elements 50 and 60 are accommodated in the two receiving grooves 35. Their front ends are pressed downwards by the flexible element 70 in the normal state, bend downwards and in turn press on the upper side of the lower holder 20.

The flexible element 70 is punched out of a metal sheet. It comprises a main body 71 and two elastic strips 72. The main body 71 has two holes through which two screws 74 can be inserted to fasten the main body 71 to two threaded holes 36 on the upper holder. The elastic strips 72 extend forward from the main body 71. Their position corresponds to that of the first and second limiting elements 50 and 60. At the front end they each have a downwardly bent extension part 75. The two extension parts 75 extend through two holes 37 in the upper holder 30 and press on the guide elements 52 and 62 of the first and second limiting elements 50 and 60 so that the guide elements 52 and 62 are in a downwardly bent state and can be elastically moved up and down.

As shown in Fig. 3 and 5, the thickness of the ejection plate 40 is approximately equal to the depth of the guide groove 31. The top of the ejection plate 40 is provided with two sliding grooves 41 and 42, the position of which corresponds to that of the two limiting elements 50 and 60. The function of the sliding grooves 41 and 42 is to accommodate the guide elements 52 and 62 of the first and second limiting elements 50 and 60 when the ejection plate 40 is pushed forward. As a result, the front tips of the guide elements 52 and 62 always remain in the guide groove 31.

As shown in Fig. 6, the staples usable by the staple guide device of the present invention are divided into U-shaped staples of the largest width 81, the second largest width 82, or the smallest width 83. The width of the U-shaped staples of the largest width 81 is equal to the width of the guide groove 31.

Fig. 7, 8 and 9 show the operation of the staple guide device of the present invention. When using the widest U-shaped staples 81, they are guided from both sides of the guide groove 31. When the shoulder 811 of a U-shaped staple 81 passes the front tips of the guide elements 52 and 62, the two guide elements 52 and 62 are pushed upward and received by the two receiving grooves 35 so that they do not interfere with the movement of the staple.

As shown in Fig. 8 and 9, the position of the two limiting elements 50 and 60 corresponds to the width of the other types of U-shaped staples used in the rivet gun. The U-shaped staples 82 and 83 are ejected along the left and right sides of the guide groove 31, respectively. During the ejection process

one side of a U-shaped clamp 82 or 83 is in tight contact with a side surface of the guide groove 31. One of the two limiting elements 50 and 60 is pushed upwards by the shoulder 821 or 831 of the U-shaped clamp, and the other limiting element remains in contact with the other side of the U-shaped clamp 82 or 83. During the ejection process, one side of a U-shaped clamp 82 or 83 is thus guided by a side surface of the guide groove 31, the other side is guided by the first limiting element 50 or the second limiting element 60.

The greatest peculiarity of the present invention is the design of the first and second limiting elements 50 and 50 as rigid bodies, their hinge connection to the upper holder 30 and their automatic springing back to the starting position by means of the flexible element 70. This is in contrast to conventional rivet guns of the same type which use staple limiting elements made by punching and bending an elastic metal sheet.

The greatest advantage is that the first and second limiting elements 50 and 60 are of a simpler shape than the limiting elements of conventional rivet guns of the same type. Therefore, their manufacture is much easier. They do not deform easily during heat treatment, thus increasing their dimensional accuracy. In addition, the first and second limiting elements 50 and 60 are rigid bodies, therefore they do not deform easily during the ejection process and thus ensure safe guidance.

Some details in the first and second limiting elements 50 and 60 of the present invention can be varied,

to increase the guiding effect. As shown in the embodiment of Fig. 10, a limiting element 90 has a hinge element 91 and a guide element 92. The hinge element 91 is provided with an elongated hole 93. The guide element 92 has an angled bottom at the end that is close to the hinge element 91, with an inclination angle 94.

As shown in Fig. 11, the limiting element 90 is suspended from the hinge bearings 32 by means of the hinge axis 95 which is inserted through its elongated hole 93. The hinge element 91 can be easily moved up and down on the hinge axis 95. When the rivet gun is at rest, the limiting element 90 receives the downward pressure of the flexible element 70 and its rear end in turn presses downward. At this point, the hinge axis 95 contacts the upper end of the elongated hole 93. In this state, the lower surface of the guide element 92 lies almost horizontally on the upper surface of the lower holder 20. Therefore, a U-shaped bracket 96 in the guide groove 31 is in contact with a large part of the surface of the guide belt 32, and the U-shaped bracket 96 is guided stably.

As shown in Fig. 12, when starting the ejection process, the ejection plate 40 would first push the rear end of the limiting member 90 upward. At this time, the hinge axis 95 contacts the lower end of the elongated hole 93. The front end of the guide member 92 still receives the downward pressure of the flexible member 70 and is in contact with the top of the lower holder 20. The inclination angle 94 at the bottom of the rear end of the guide member 92 allows the ejection plate 40 to move freely under the guide member 92.

As shown in Fig. 12, only when the ejection plate 40 moves further toward the end of the guide groove 31 is the front end of the guide member 92 pushed upward by the ejection plate 40 and separated from the top of the lower holder 20.

The greatest advantage of designing the present invention in this embodiment is that the guide element 92 of the limiting element 90 is in contact with the upper surface of the lower holder 20 at its rear end for as long as possible. When the ejection process of the U-shaped brackets 96 begins, the lower surface of the guide element 92 lies almost horizontally on the upper surface of the lower holder 20. Therefore, the contact area of the guide element 92 with the U-shaped brackets 96 can be maximized and a more stable guiding effect can be achieved.

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Claims (5)

PROTECTION CLAIMS 1. Staple guide device in a rivet gun for the use of U-shaped staples of various sizes as well as straight pins, the staple guide device comprising:
a lower holder connected to the top of the rivet gun magazine;
an upper holder that is attached to the top of the lower holder? a guide groove on the contact surface of the upper holder and the lower holder into which the staples can be inserted from the magazine and through which the staples can be ejected with the help of an ejection element of the rivet gun and shot into the work object?
a first and a second limiting element which extend from the rear end of the guide groove to the lower part of the front end of the guide groove and which are attached to the upper colder with a hinge/ a flexible member mounted on the upper bracket and elastically pressing the first and second limiting members from above so that the first and second limiting members are inclined downward and press against the bottom surface of the guide groove; and two receiving grooves in the ceiling surface of the guide groove for receiving the first and second limiting members. 2. Staple guide device in a rivet gun according to claim 1, wherein the first and second limiting elements are each provided with a hinge element and a forwardly extending guide element; and · two hinge bearings mounted on the top of the upper holder, the hinge elements extending from the guide groove to the hinge bearings on the top of the upper holder and being suspended from the hinge bearings by means of a hinge axis. 3. Stapler guide device in a rivet gun according to claim 1, wherein the first and second limiting elements are each provided with a vertical elongated hole through which the hinge axis is inserted, so that the first and second limiting elements are movable up and down, with the effect that the rear ends of the guide elements of the limiting elements are in contact with the lower surface of the guide groove as far as possible, increasing the length of the guide elements in contact with the U-shaped staples, and with the further effect that the rear ends of the guide elements are pushed upwards when the U-shaped staples are ejected. 4. Staple guide device in a rivet gun according to claim 3, wherein the underside of the limiting elements at the rear end of the guide elements has an inclination angle. 5. Staple guide device in a rivet gun according to claim 1, wherein the flexible element äUiWSISui a main body mounted on the upper holder; and two strips that extend from the main body and press elastically down on the first and second limiting elements.