EP1005958B1 - Gas driven fastener setting tool - Google Patents

Abstract

The wall plug fixing drive tool has a casing (1) with an integral handle (5) and a housing (6) for a gas cartridge. A removable plug supply magazine contains a tape of plug reception collars, a plug guide (3) a shearing cutter (4) for the tape and an anti-firing safety system. The shearing cutter and magazine engage by fitting a skirt (11), integral with the shearing cutter, having a plug supply passage (12) in a housing in the skirt.

Description

The invention relates to a combustion pad fixing apparatus. of a flammable compressed gas, in particular used in the field of building for fixing cable fixing bases, chutes and other such accessories.

This type of fixing device comprises a cylinder, in which is mounted sliding a buffer propulsion piston, a combustion chamber, a housing for receiving a compressed gas cartridge, a store removable pad feeder, pad guide, block of shear and a handle.

The removable buffer supply magazine contains a strip of buffer receiving rings. The shear block has a buffer reception passage which communicates with the pads and extends forward through a pad guide passage of the tampon guide, intended to guide the tampon until its penetration in the support.

When firing, the head pad of the support strip is introduced into the shear block and, after pressing the device against a support, the piston is propelled forward and strikes the buffer received in the block of shear. Under the impact of the strike, the band of reception rings of pad is sheared, the strip head pad, detached, is projected towards the front, being guided by the buffer guide, and enters the support.

The shear block of known devices is formed in two parts, upper and lower, each providing a section groove semi-circular cross-section. The upper part is integral with the buffer guide and a box containing the cylinder and the combustion chamber, and the lower part is integral with the buffer supply magazine. When the buffer supply magazine is mounted on the device, the lower part and the upper part are indexed one with respect to the other and joined to each other using two protruding pawns of the lower part and received in two through openings in the upper portion. After joining the two upper parts and lower, the two semi-circular grooves form the receiving passage of buffer. Then lock the buffer supply magazine and the shear block, using a wheel locking system, in order to prevent the separation of the two lower and upper parts.

When the buffer magazine is removed from the device, it is removed also the lower part of the shear block. For reasons security system, generally electronic, prohibits fire the device without the buffer magazine.

The operation consisting in indexing the two parts of the shear block then locking it is tedious. On the other hand, with the fixing device described above, it is impossible to pull without the buffer supply store. It would be interesting to be able to use the device without its buffer store, for example to fix a pad pre-mounted on a part to be fixed.

The present invention aims to overcome these drawbacks.

To this end, the invention relates to a tampon fixing device by drive of the buffer by a propulsion piston, according to the claim 1.

With the fixing device of the invention, after removal from the magazine pads of the device, the shear block remains in one piece. The device can therefore be used with or without the buffer magazine. grace to this, we remove the security system prohibiting fire after withdrawal from the stamp store. In addition, the device, without the magazine pads, can be used to fix a pad in a deep profile, which would be impossible with the buffer store mounted on the device due to the size of the store.

Note that US Patent 4,196,833 teaches an apparatus which does not has no actual shear block because shear is carried out by the buffer guide and the magazine. This patent does not teach so no buffer guide and shear block, because the buffer guide is part of the shear block, nor of apparatus with a block of shear because, without a magazine, there is no shear block.

Advantageously, the shear block and the feed magazine buffers are arranged to cooperate by fitting a skirt, providing a buffer supply passage in a housing for reception of the skirt.

It is thus easy to index the store relative to the device.

Preferably, the skirt and its receiving housing are shaped to that the nesting of one in the other is done with play.

Thanks to this, the buffer magazine can be very easily mounted on the device.

More preferably, the skirt is integral with the shear block.

Advantageously also, provision is made for latching means for the fixing the buffer supply magazine to the device.

In a particular embodiment, the latching means include a shoulder, supported by a pin mounted on means of reminder, intended to cooperate with a groove for receiving the shoulder, extended by at least one pushing finger and blocking of the shoulder.

• la figure 1 représente une vue en perspective partielle de l'appareil de fixation sans magasin de tampons;
• la figure 2 représente une vue en perspective du magasin de tampons de l'appareil de la figure 1;
• la figure 3 représente une vue en perspective d'un système d'encliquetage pour la fixation et le verrouillage du magasin de tampons de la figure 2 sur l'appareil de la figure 1, juste avant fixation;
• la figure 4 représente une vue en coupe du système d'encliquetage de la figure 3, le long de la ligne IV-IV;
• la figure 5 représente une vue en coupe du système d'encliquetage de la figure 3, après fixation et avant verrouillage, le long de la ligne IV-IV;
• la figure 6 représente une vue en coupe du système d'encliquetage de la figure 3, après fixation et avant verrouillage, le long de la ligne VI-VI;
• la figure 7 représente une vue en coupe du système d'encliquetage de la figure 3, après verrouillage, le long de la ligne IV-IV et
• la figure 8 représente une vue en coupe du système d'encliquetage de la figure 3, après déverrouillage, le long de la ligne IV-IV.

The invention will be better understood using the following description of a particular embodiment of the fixing device of the invention with reference to the attached drawing in which:

• Figure 1 shows a partial perspective view of the fixing device without buffer store;
• Figure 2 shows a perspective view of the buffer store of the apparatus of Figure 1;
• Figure 3 shows a perspective view of a snap system for fixing and locking the buffer store of Figure 2 on the device of Figure 1, just before fixing;
• Figure 4 shows a sectional view of the latching system of Figure 3, along the line IV-IV;
• 5 shows a sectional view of the latching system of Figure 3, after fixing and before locking, along the line IV-IV;
• 6 shows a sectional view of the latching system of Figure 3, after fixing and before locking, along the line VI-VI;
• FIG. 7 represents a sectional view of the latching system of FIG. 3, after locking, along the line IV-IV and
• 8 shows a sectional view of the latching system of Figure 3, after unlocking, along the line IV-IV.

From the outset, it will be noted that "the front" and "the rear" respectively denote the direction to which a buffer is propelled during a shot and the direction opposite.

The tampon fixing device comprises a case 1, integral with a handle 5 and a housing 6 for receiving a gas cartridge tablet, a removable magazine 2 for supplying buffers, intended for contain a strip of buffer receiving rings, a buffer guide 3, a block 4 for shearing the strip of buffer receiving rings and an anti-fire security system.

The housing 1 contains a cylinder, in which is slidably mounted a buffer propulsion piston, a combustion chamber and a battery receiving housing, not shown.

The anti-fire safety system prohibits any shooting without prior support of the device against a support.

The buffer guide 3 and the shear block 4 extend in front of the housing 1, along a longitudinal axis 7. The handle 5 extends substantially perpendicular to the axis 7, here parallel to the receiving housing 6 of the compressed gas cartridge and on the back of it. The handle 5 and the housing 6 extend below the housing 1, in an axial plane (that is to say containing the center axis 7) of the apparatus, which will be called "plane P" thereafter.

The shear block 4 has two parts, lower 9 and upper 10, each providing a groove of semi-circular cross section and secured to each other using screws 8, 8 '. It should be emphasized here that because that the two parts, lower 9 and upper 10, are integral with one of the other, the shear block 4 is functionally in one piece. We would have just as well could have considered a shear block made up of a single part.

The two grooves in the lower 9 and upper 10 parts of the block shear 4 form a buffer receiving passage extending forward through a tampon guide passage through the tampon guide 3 and intended during a shot to guide the tampon to its penetration in a receiving material.

The upper part 10 of the shear block 4 is integral, at its front end, of a buffer guide holder 13 in which is mounted sliding the buffer guide 3. The buffer guide 3, thus mounted sliding relative to the shear block 4, which acts here as a setting probe support and closing of the combustion chamber.

The lower part 9 of the shearing block 4 is integral with a skirt external projection 11 providing a through passage 12 for supplying buffer in the shear block 4, which communicates with the passage of receive buffer from it.

The rear end part of the shear block 4 is received and screwed in a receiving cradle 14, integral with the front part of the housing 1.

The buffer store 2 contains a housing for receiving a strip of buffer receiving rings, with an upper opening 15, and a system for pushing the buffer strip towards the upper opening 15. The receiving housing of the buffer strip communicates by the upper opening 15 with a housing 16 for receiving the skirt 11 of the shear block 4. The magazine 2 extends along a longitudinal axis 19. Thereafter, the center plane of store 2 will be called "plane P '" containing axis 19.

The shear block 4 and the buffer magazine 2 are intended for cooperate by fitting the skirt 11 into its receiving housing 16, the skirt 11 and its receiving housing 16 being shaped so that the nesting of one in the other is done with play.

The buffer store 2 has a rear face 17, intended to come in look of a front face 18 of the housing 6. The face 17 supports, at its lower end, a female latching part 40 intended for cooperate with a male latching part 20 secured to the end lower side 18, for fixing the buffer magazine 2 on the device.

The male latching part 20 has a pin 21 supported by two flanges 24, 25 and itself supporting two shoulders 26a, 26b, in form of flanges.

The two flanges 24, 25 extend generally parallel to the plane P of the device, on either side of it, and the axis 21 is perpendicular to it plane P. The two flanges 24, 25 are extended at the rear respectively by two fixing feet 22a, 22b, integral with the housing 6 and in support One against the other.

The flange 25 includes a housing 27 for receiving a portion end 21 a of the axis 21, projecting towards the inside of the male part 20. A spring 28 is in abutment, at one of its ends, against the bottom of the housing 27 is, at its other end, against the bottom of an axial cavity 29 formed in the end portion 21a. Axis 21 is thus mounted on a spring and movable in axial translation.

The flange 24 includes a housing 30 for receiving the shoulder 26b, projecting towards the inside of the male part 20. A through opening 31, passage of the end part 21b of the axis 21 opposite the part end 21a, is formed in the bottom of the housing 30. The axis 21 is thus laterally protruding from the flange 24 outward. The part end 21b is threaded and received in a threaded hole 33 formed in a wheel 32 for driving the axis 21, and comprises two flats intended to cooperate with two conjugate dishes of the opening 31, in order to block in rotation the axis 21. A stop 34, intended to block in axial translation the wheel 32, is fixed on the external lateral surface of the flange 24 and has a through opening for passage of the axis 21.

The translation of the axis 21 is limited, on the one hand, by abutment of the shoulder 26a against the edge of the housing 27 and, on the other hand, by abutment the shoulder 26b against the edge of the opening 31, located at the bottom of the housing 30.

The housings 27 and 30 are separated from each other by a space 36 of reception of the female latching part 40, as will be explained further.

The two fixing feet 22a, 22b, form a free surface 31, extending in the vicinity and behind the axis 21 in a plane overall perpendicular to the axis 7. The two flanges 24, 25 provide between them a lower passage 35 for introducing the female snap-on part 40 extending upward through a passage 35 '(FIG. 6) for receiving a positioning plate 46 of the female latching part 40, formed between the surface 31 and the walls of the housings 27 and 30.

In the rest position (Figures 3 and 4), the shoulder 26a is arranged in the reception space 36, at the right of the introduction passage 35. The shoulder 26b extends to the bottom of its receiving housing 30 and the wheel 32, unscrewed, is moved away from the stop 34.

The female latching part 40 has a groove 41 for receiving the shoulder 26a, extending in the plane P ', extended upwards by two fingers, rear 42 and front 43, symmetrical, pushing and blocking the shoulder 26a, as will be explained later. The front finger 43 is adjacent to the surface 17 and the rear finger 42 is moved away from it, towards the rear.

The fingers 42, 43 tighten towards each other from their ends respective connection with the groove 41 towards their free ends, separated from each other by a distance slightly greater than the diameter of the axis 21. The groove 41 has an internal wall for receiving the shoulder 26a, of semi-circular shape in longitudinal section in the plane P ', oriented towards the upper part of the store 2. The internal walls of the fingers 42, 43 extend the internal wall of the groove 41, the internal wall overall having a circular shape in longitudinal section (parallel to the plane P '), of diameter substantially greater than that of the shoulder 26a, with an opening for the passage of the axis 21. The fingers 42, 43 are thus intended to block the shoulder 26a in its groove reception 41.

Each finger 42 (43) comprises a right external lateral face 44a, parallel to the plane P ', and another external lateral face 44b inclined by relative to the plane P ', the width of the finger 42 (43) narrowing from its end of connection with the groove 41 towards its free end. The faces inclined 44b, thus shaped into corners, act as surfaces of thrust intended to push the shoulder 26a laterally when the introduction of the male latching part 20 into the female part latching 40, as will be explained later.

The section of the lateral opening 47 of the female latching part 40 in the plane of the right lateral face 44a is narrowed, less than the section transverse of the shoulder 26a but slightly greater than the section transverse of axis 21.

The rear finger 42 supports the positioning plate 46 extending perpendicular to the plane P 'and parallel to the longitudinal axis 19.

A fixing arm 45 is integral with the female latching part 40, and extends in the longitudinal plane P ', downwards, opposite the fingers 42, 43. The fixing arm 45 is received in a slot made in a projection 48 secured to the lower end portion of the surface 17 and screwed to this projection 48.

The width of the groove 41, perpendicular to the longitudinal plane P ', is substantially less than the distance separating the two housings 27 and 30, in other words to the width of space 36, and slightly greater than the width of the shoulder 26a.

The operation of mounting the buffer magazine 2 on the fixing will now be described.

An operator first indexes the buffer store 2 with respect to the fixing device by positioning the skirt 11 in front of its housing reception 16 and the female latching part 40 in the lower passage introduction 35 of the male latching part 20.

Then the operator pushes the magazine 2 upwards (that is to say towards the axis 7). The skirt 11 then fits into its receiving housing 16 and the part female snap 40 enters the male snap part 20.

When the female snap-in part 40 is introduced into the part latching male 20, the positioning plate 46 is received and blocked in its receiving passage 32. Furthermore, the thrust surfaces 44b pushing fingers 42, 43 laterally push the shoulder 26a, against the return action of the spring 28, until the receiving groove 41 comes substantially to the right of the shoulder 26a. It then enters in the receiving groove 21, under the pushing action of the spring 28, and abuts against the inner edge of the narrowed side opening 47. In this position, the fingers 42, 43 block, retain the shoulder 26a in the receiving groove 41.

Then, by screwing, the operator moves the wheel 32 along the axis 21 until it comes to rest against the stop 34. In this way it is blocked axial translation of the wheel 32, which prevents the operator from training in displacement of the axis 21. The shoulder 26a is thus locked in the groove receiving 41, which ensures the locking of the buffer magazine 2 in functional position on the fixing device.

After fixing the buffer magazine 2, the tape head buffer is introduced into the buffer receiving passage of the shear block 4, via the inlet passage 12, under the pushing action of the pushing system of magazine 2. To fix a tampon in a support, the operator sets up press the device against this support. During the support, the operator causes the case 1 to move forward, integral with the block of shear 4 and of the buffer guide holder 13, relative to the buffer guide 3 the free end of which bears against the support. The support causes the combustion chamber to close, in which gas tablet is injected, and unlocking the anti-fire security system. Then the operator starts the firing, in order to explode the gas tablet contained in the combustion chamber. The piston is then propelled forward and strikes the buffer received in the passage of receiving the shear block 4. Under the action of striking, the strip of rings are sheared and the buffer, detached, is thrown forward and guided through the guide passage of the buffer guide until it enters the support.

To remove the buffer magazine 2, the operator moves the thumb wheel 32 away from the stop 34, by unscrewing, then push it towards stop 34 against the action of return of the spring 38 by causing the axial movement of the axis 21 until that the shoulder 26a abuts against the edge of the housing 27. In this position (Figure 8), the shoulder 26a is no longer retained in the receiving groove 21 by fingers 42, 43, and the operator separates the parts, male 20 and female 40, latching by pulling down the magazine stamps 2.

After removal from the magazine, the fixing device can be used to fix a buffer pre-mounted on a part to be fixed, or to fix a buffer in a deep profile.

For safety, a shutter could be provided to seal the buffer feed passage from the shear block skirt after removal from the stamp store.

Claims (9)

1. Apparatus for fixing a plug by driving the plug by a driving piston, including a detachable magazine (2) for supplying plugs, intended to contain a strip of plug reception rings, a plug guide (3) and a block (4) for shearing the strip of plug reception rings arranged to receive a plug with it ring from the magazine and the driving piston to shear the strip by driving the plug, characterised by the fact that the shearing block (4) is functionally in one piece, with a lower part (9) and an upper part (10) permanently rigidly attached one to the other.
2. Apparatus as described in claim 1, in which the shearing block (4) and the plug supply magazine (2) are arranged to co-operate by fitting of a skirt (11), providing a plug supply passage (12), in a housing (16) for reception of the skirt (11).
3. Apparatus as described in claim 2, in which the skirt (11) and its reception housing (16) are shaped for the fitting of one into the other to take place with clearance.
4. Apparatus as described in one of claims 1 to 3, in which the skirt (11) is rigidly attached to the shearing block (4).
5. Apparatus as described in one of claims 1 to 4, in which snap-fit means are provided for fixing the plug supply magazine (2) to the apparatus.
6. Apparatus as described in claim 5, in which the snap-fit means comprise a shoulder (26a), supported by a shaft (21) mounted on return means (28), intended to co-operate with a groove (41) for reception of the shoulder (26a), extended by at least one finger (42, 43) for thrusting and locking the shoulder (26a).
7. Apparatus as described in claim 6, in which means (32, 34) are provided to prevent the shaft (21) being driven in displacement in order to lock the shoulder (26a) in the reception groove (41).
8. Apparatus as described in one of claims 1 to 7, in which a cradle (14) is provided for reception of a rear end part of the shearing block (4).
9. Apparatus as described in one of claims 1 to 8, in which the plug guide (3) is mounted slidingly relative to the shearing block (4).

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