JPS6210787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a safety device for a power fastener that supplies staples such as staples from a magazine that is located laterally to the firing groove in order to prevent accidental explosion of staples and nails. A plunger, a mouthpiece having a firing groove and placed on the article, a movable shutoff device located on the side of the firing groove facing away from the magazine, and a power fastener protruding from the mouthpiece on the article. It consists of a movable plate that is movable in the direction opposite to the direction in which it is pressed, and that moves the movable interrupter to open the firing groove when the power fastener is placed on the article. It is about what is done.

A so-called firing safety device for a compressed air-operated fastener is known in which a firing detector is provided in the base of a power fastener. The firing detector is mechanically connected to a firing valve lever or to an interconnected additional valve. The firing detector is provided at the base of the power fastener and moves upward when placed on an article.
This allows the powered fastener to fire as long as the firing detector is pressed. (U.S. Pat. No. 3,194,324 or 3,278,106) In conventional firing safety measures, it attempts to prevent firing before the pneumatic actuated fastener is placed on the article. However, such firing safety means cannot prevent firing if the firing detector is pressed against another article. For example, this other item may be the operator's other hand. In operation, this type of firing detector is often used for firing confirmation. In the end, the selector switch and launch detector had a major impact on the convenience and compactness of the device.

Another known feature is the reduced convenience and compactness of special detectors and toggle switches.
This can be avoided by mounting the compressed air-operated fastener in a somewhat axially displaceable manner (German Patent No. 20 09 455). The firing valve is actuated only after the powered fastener contacts the article by pushing axially against the rebound force of the spring. From a structural point of view and an aesthetically pleasing design, it is not possible to achieve a relatively high degree of safety with such an arrangement. However, it is also possible that the operator can move the case without touching any items at all.

Furthermore, it is also known to arrange an additional safety valve in the compressed air passageway of the power fastener. The valve is a manual valve and prevents firing when inactive (German Patent No. 28 11 339). However, even in such a device, firing cannot be prevented when the contact firing detector is not in contact with an article but with another object, such as a hand.

Furthermore, there is also known a structure in which a blocking device is provided on the side of the firing groove that faces away from the magazine without preventing connection with the firing valve at all. When the blocking device is in the firing prevention position, it is pushed into the firing groove through which the staples fed to the device pass and pushes the staples out of the firing groove against the supply force of the supply spring (German Patent No. 19 11 341 ). Such a shutoff device consists of a crank spring and a crank that is forced into a firing groove. The slope of the crank corresponds to the degree of curvature of the portion pushed out by the mouthpiece still resting on the article when the device is in the firing prevention position. The movable part of the movably arranged cap part is moved upward when the device is placed on the article. By moving the crank spring out of the firing groove,
The staple becomes movable from the magazine to the firing groove for firing by the plunger. If the firing means were to operate without movement of the moving parts of the mouthpiece, the plunger would be blanked by the curvature of the side of the crank.

The above-mentioned safety device, despite its simple construction, has several drawbacks. That is, the exposed cap portion can be very easily activated by an operator even when the user does not actually intend to activate it. In the case of dry firing, despite the presence of the shutoff, the staple may partially extend into the firing groove and be pushed and moved together by the plunger. this is,
Either the staple will be fired from the firing groove, or the staple will become jammed in the firing groove. Both phenomena are disadvantageous. Furthermore, when the staple has already reached the firing groove, the above-mentioned device cannot prevent the staple from actually firing even if it is thought to be blank firing.

The object of the present invention is to use a stapler (staple)
Our objective is to provide a safety device for power fasteners that prevents the accidental firing of nails or nails when unnecessary. The device is easy to manufacture and install, and effectively prevents staple clogging.

In the conventional safety device mentioned at the outset, this objective can also be achieved by axially installing the interrupter. That is, the axial cradle is quickly pushed under its lower end and advances into the firing groove when the device is in the fire-protected position, i.e. when the plunger is in the pre-fire position.

However, with this safety device, despite the presence of the shutoff device, the driver will fire blankly. In the device according to the invention, on the contrary, this can be prevented. The cradle of the safety means according to the invention extends under the lower part of the plunger when the plunger is in the upward or fireproof position.

If the firing means is activated at this time, the plunger exerts pressure on the pedestal from above. The rear part of the interrupter and the support are designed so that the interrupter does not bend during this time and retains its position. The plunger is therefore held on top despite the pressure from the piston to which it is connected. At the same time, it puts a relatively large amount of pressure on the shutoff. Then, it no longer moves via the movable plate placed on the article. The safety means according to the invention prevents the operating plate of the mouthpiece and the firing means from operating. Therefore, a powered fastener with a safety device according to the invention cannot be permanently actuated manually or triggered by an article detector as described above.

Therefore, an advantage of providing the apparatus of the present invention is that it provides the security that the firing valve will not activate and the staple will fire unless the powered fastener is properly placed on the article.

Although heretofore and hereafter a compressed air actuated fastener will be described, the safety device according to the invention is of course not limited thereto, but can equally be applied to other powered fasteners. Especially good for electric fasteners.

In one embodiment of the present invention, what must be prepared is a cradle that is biased by a spring, and a hard shutoff device that is rotatably supported and connected to the cradle in the axial direction of the mouthpiece. Only. Therefore, the shutoff device is designed and arranged to effectively counteract the static pressure when the plunger is actuated.

The blocking device is supported so that its position can be changed by rotational movement between firing and firing prevention. In this regard, a more preferred embodiment of the present invention is to support the interrupter by providing a ball within the mouthpiece that forms the firing groove.

In the first-mentioned conventional safety measures, a part of the base part has to be used for actuating the shutoff. In contrast, in the embodiment of the present invention, the movable plate may be a sliding plate movably supported in the guide groove of the mouthpiece. By that,
The movable plate is necessarily covered and placed within the base.
Therefore, the operator cannot accidentally suspend its effectiveness.

According to another embodiment of the invention, the movable plate moves idly through the predetermined path against the pressure of the spring until it comes into contact with the interrupter and actuates it. Shutdown occurs in two stages by the movable plate initially located in the opposite direction to the direction in which the device is placed, overcoming the repulsive force of the weak spring.
And this happens once the pressure balance point is exceeded. In other words, the shutoff occurs when the movable plate moves further away from the shutoff device. In this way, the movable plate can be almost completely hidden within the base, or it can be moved only a small distance and pushed out of the base. In its movement, the movable plate must be moved overcoming the repulsive force of the spring in order to reach the final position. This means that the operator must press the powered fastener against the article with some force to release the blockage. Inadvertent release of the protection by the operator, which could occur by pressing the movable plate with more or less force or by placing the power fastener on another article, can thereby be ruled out.

The base including the firing groove is usually composed of two plate-shaped bases. One consists mostly of the case or magazine, the other the first;
For example, it is connected as an accessory using a screw or the like. For this purpose, a further embodiment of the invention requires a blocking device and a movable plate arranged inside the second part of the base. This makes it impossible to operate these items from the outside.

The following embodiment of the invention is particularly simple and effective. The two parts of the mouthpiece are a guide plate that forms the firing groove and a cover plate that can be connected to the guide plate that covers the guide groove, and the guide plate is located on the opposite side of the firing groove. It has a guide groove consisting of an elongated operating plate, the operating plate has a blocking device on its upper bifurcated leg, and the cover plate has a blocking device above it for blocking when the device is in the firing position. It is characterized by having a recess into which a part of the tool fits.

A base designed in this way requires only a little more space than conventional bases. Therefore, the beauty of the power fastener is not impaired.

According to another embodiment of the invention, the guide plate and the cover plate arranged together are attachments that are additionally fixed to the power fastener or the magazine. The attachment is designed to allow the power fastener to be used upon placement. Usually, the mouthpiece located on the opposite side of the magazine is secured with a screw. The attachment unit has a threaded hole therein for fixing the base portion exposed on the case or on the opposite side thereof.

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a partial sectional view of a power fastener having a safety device according to the invention. The power fastener is composed of a case 1, a magazine 2, a cylinder 3, a buffer member 6 at the lower end of the cylinder, and a release valve 7 operated by a lever 22. Inside the cylinder 3, there is a piston 4 that can move up and down to which a plunger 5 is fixed, and compressed air is introduced from an air chamber 23 in the case 1 through a release valve 7 to move the piston 4 in one direction. .

The base of the compressed air actuated fastener is indicated generally by the numeral 9. The mouthpiece has a firing groove 8 through which the plunger 5 passes. Launch groove 8
are the flattened tips 3 that collectively form the case 1.
0 by a so-called elongated depression. It is designed as an attachment. The shape of these accessories is clear from the exploded view in FIG. The accessory forms a firing groove 8 on one side thereof, as can be seen in Figures 1 to 3.
Guide plate 1 guiding the plunger 5 and staples
Consists of 0. A guide groove, which is a rectangular recess, is formed on one side of the guide plate 10 facing away from the firing groove 8. The guide plate 10 has a recess 32 formed in the upper part of the guide groove, and the lower surface of the recess 32 is connected to the pedestal holder 3.
It has become 3. In the guide groove 11, there is a movable plate 12 having two legs 25 disposed in parallel on the upper part.
are arranged neatly. The movable plate 12 has a long hole 34 at the center below the leg and a tapered part 35 at the end. The guide groove 11 in which the movable plate 12 is disposed is covered by a cover plate 18, and the cover plate 18 is fixed to the guide plate 10 by passing screws (not shown) through fixing holes 19. For this purpose, screw holes 36 are formed in the guide plate at corresponding positions.

FIG. 2 is a cross-sectional view of the mouthpiece of the power fastener having the safety device shown in FIG. 1; FIG. 3 is a depiction similar to FIG. 2, but shows where the safety device has been activated.

As can be seen from FIGS. 2 and 3, the blocking device 13 is arranged between the legs 25 of the movable plate 12. Shutoff device 1
3 has a ball 17 formed on the side facing the attachment unit 31 with a spherical recess 44 which partially extends therein and is supported by a corresponding spherical counter recess 37 of the attachment unit 31. have. The blocking device 13 is adjusted so that the protrusion 21 on the upper part protrudes into the recess 32 of the guide plate 10. At the same time, the lower surface 38 of the protrusion 21 forming the pedestal surface is exposed to the second
When in the position shown in the figure, the pedestal holder 33
It is arranged so that it is in contact with the When in that position, the safety is in the activated position by the adjusted spring 14 in the conical opening in the cover plate 18. In this position, the sliding surface 39 of the blocking device 13 facing the firing groove 8 is very close to the flat wall surface of the guide groove 11 in the guide plate 10. Shutoff device 1
3 is tapered at the tip, as indicated by the numeral 40, so that, according to FIG.
to the recess 41. Thereby, the protrusion 21
The cradle 42 and the protrusion itself on the upper surface of the holder are excluded from within the firing groove 8, as shown in FIG.

A coil spring 15 is inserted into the long hole 34 of the movable plate 12.
is located. Furthermore, the pin 16 reaches the elongated hole 34 through a passage hole in the cover plate 18. The pin 16 limits the downward movement of the movable plate 12 when the coil spring 15 attempts to move the movable plate 12 out of the range of the guide groove 11. As can be seen from Figure 2,
Only the tapered part 35 projects from the guide groove 11 and forms a projection from the base part.

FIG. 4 is an exploded view of the cap portion of the power fastener having the safety device according to the invention shown in FIGS. 1 to 3. FIG.

As can be seen from FIG. 4, the blocking device 13 has sloped portions 26 like ramps on both sides of the protruding portion. That surface is shown in broken lines in FIGS. 2 and 3. From FIG. 2, it can be seen that the leg portion 25, which has a slightly rounded end, maintains a certain distance from the slope portion 26 when the launch is prevented.

Guide plate 10 and cover plate 18 with fixing holes 20
by that the attachment unit 31 formed by them can be fixed to the magazine,
are in a straight line with each other. The corresponding fixing screw 43 is
It can be seen in Figures 1 to 3.

The functions of the device are as follows. That is,
During firing prevention, the movable plate 12 is influenced by the coil spring 15 in the extended position. Under the influence of the spring 14, the protrusion 21 of the interrupter 13 is pushed into the firing groove 8 of the mouthpiece 9. When the lever 22 is actuated, compressed air flows from the air chamber 23 into the groove 24.
Next, it goes into the cylinder. Then, it exerts an effect on the upper surface of the piston 4, which generates a downward force. Plunger 5 produced by this
When the plunger is resting on the protrusion 21 as shown in FIG. It can be prevented by twisting. Thereby, staple 2 in magazine 2
7's launch can be prevented. As can be seen from Figure 3,
The effective air-fire safety device in this method is released by placing the cap 9 on the article. In this operation, the tapered part 35 of the movable plate 12 protruding from the base part 9 is connected to the coil spring 1.
Apply upward force against the return force in step 5. Thereby, the leg 25 moves upwardly towards the sloped part 26. Furthermore, the upward movement of the movable plate 12 leads to an axial movement of the interrupter 13 in a counterclockwise direction, as can be seen in FIG. Therefore, protrusion 2
1 or the pedestal 42 is removed from the firing groove 8,
A passage for the plunger 5 is thereby opened. During this axial movement of the interrupter, it moves around the ball 17. After completing this operational stage,
That is, after the device is lifted from the article, the movable plate 12 is advanced to the firing prevention position by the repulsive force of the coil spring 15 (FIG. 2). The leg 25 therefore opens the ramp 26 of the interrupter. The interrupter then pivots again to the firing prevention position under the influence of the spring 14.

To disable the explosion safety device with the lever 22 that has already been operated, the plunger 5 is placed on the stand 42.
This can be prevented by applying relatively large pressure. This prevents axial movement of the interrupter.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a power fastener having a safety device according to the present invention. FIG. 2 is a cross-sectional view of the mouthpiece of the power fastener having the safety device shown in FIG. 1; FIG. 3 is a depiction similar to FIG. 2, but shows when the safety device is activated. Fourth
1 is an exploded view of the base of the power fastener having the safety device according to the invention shown in FIGS. 1 to 3. FIG.

Claims (1)

[Scope of Claims] 1. Used in a type of power fastener that supplies staples or nails laterally from a magazine to a firing groove, which includes a plunger, a mouthpiece having a firing groove that comes into contact with an article, and a firing prevention device. and a movable plate that protrudes from the mouthpiece and moves the shutoff device to open the firing groove when the powered fastener comes into contact with the article. In the safety device, the blocking device 13 has a pedestal 42 that is positioned below the lower end of the plunger 5 in the firing groove 8 to fix the plunger 5 in the axial direction, and
A safety device for preventing the explosion of staples and nails, characterized in that the movable plate 12 is housed in the mouthpiece 9 and moves the pedestal 42 from within the ejection groove 8 when an article is brought into contact with the object. 2 The pedestal 42 is biased by the spring 14, and together with the pedestal holder 33 of the mouthpiece 9, the plunger 5
A hard interrupter 13 is fixed and rotatably supported.
Claim 1 which is provided in
Safety device to prevent staples and nails from exploding as described in Section 1. 3. The safety device for preventing explosion of staples and nails according to claim 2, wherein the blocking device 13 is rotatably supported by a ball 17 within the mouthpiece 9 forming the firing groove 8. 4. The movable plate 12 is a slide plate that is movably supported in the guide groove 11 of the base part 9. Safety device. 5. The safety device for preventing the explosion of staples and nails according to claim 2, 3 or 4, wherein the slide plate operates together with the slope portion 26 of the blocking device 13. 6. The slide plate moves idly in a predetermined path against the pressure of the coil spring 15 until it comes into contact with the interrupter 13 and activates it. Safety device to prevent staples and nails from exploding. 7. The blocking device 13 and the movable plate 12 are covered by the mouthpiece 9 close to the firing groove 8. Claims 1, 2, 3, and 4,
The safety device for preventing the explosion of staples and nails as described in item 5 or 6. 8 The mouthpiece 9 is connected to the guide plate 10 on the opposite side of the firing groove 8.
A guide plate 10 constituted by a firing groove 8 with a guide groove 11 for an elongated sliding plate configured within, a cover plate 18 connected to the guide plate 10 covering the guide groove 11, and an operating plate 12. The blocking device 13 is configured by a leg portion 2 of the movable plate 12 which is divided into two.
5, and the cover plate 18 has a recess 41 above it for allowing the blocking device 13 to fire.
A safety device for preventing the explosion of staples and nails according to claim 7, which has the following. 9. The guide plate 10, the cover plate 18, and the parts accommodated by them are separably fixed to the case or magazine of the power fastener, and constitute an attachment unit 31. Claim 8 Safety device to prevent staples and nails from exploding as described.