EP0235083B1 - Powder-actuated nail setting tool - Google Patents

Abstract

An explosive powder charge operated fastening member driving tool has a muzzle part which can be locked within and released and removed from the tool housing by rotational movement and axial movement relative to the housing. When the tool is not ready to be fired, a contact pressure sensor projects from the front end of the muzzle part. By pressing the sensor opposite to the firing direction it compresses a firing mechanism spring and the tool is ready to be fired. Stop elements are provided on the muzzle part and stop surfaces are located on the tool housing. When the muzzle part is in the unlocked condition, the stop elements can abut the stop surfaces and block the displacement of the contact pressure sensor preventing it from compressing the firing spring mechanism so that the driving tool cannot be placed in the ready-to-fire condition.

Description

The invention relates to a powder-powered bolt gun with a laterally projecting handle housing, an ignition mechanism with a tension spring in the housing, a projecting in the setting direction mouthpiece with a non-circular circumferential contour that is displaceable relative to the housing against holding stops in a front and against a sling in a rear position , and a pressure sensor which is displaceable with respect to the mouth part in an ignition readiness position exciting the tension spring, the free end face of which, in the ignition readiness position, is flush with the free end face of the mouth part located in the rearward position.

Powder-operated bolt setting tools are used to drive nails and the like fasteners into hard ground, such as concrete, steel, at high speed. For safety reasons, the setting tools have pressing devices which only enable a setting process to be triggered if the setting device is pressed against the ground with a mouthpiece.

In the case of a setting tool which can be removed from DE-AS 16 03 841, the pressing device has a tubular contact pressure sensor which is displaceably mounted in the mouth part and which, when the setting tool is in the rest position, projects forward over the free end face of the mouth part, that is to say in the setting direction, and its central bore is concentric with the driving axis. A guide bush for a driving piston acts on the rear end face of the pressure sensor, which in turn is acted upon in the setting direction by a tension spring of an ignition mechanism. The guide bush is slidably mounted in a housing and is pushed back under pressure conditions by the pressure sensor against the force of the tension spring back to the ignition ready position.

The mouth part is non-rotatable in the housing and axially displaceable to a limited extent. In order to limit the displacement path to the front, stop stops which come into contact with one another and to limit the displacement path to the rear interacting stop means are provided on the mouth part and on the housing. The installation of the mouth part in the specific rotational position requires auxiliary tools and, overall, considerable assembly effort. Removing and installing the mouth part, for example to change the driving piston, is therefore very complex.

The placement of fasteners in narrow profile rails or the placement near and along a wall requires a non-circular circumferential contour of the mouth area of the mouth part. A laterally protruding handle of the housing is in a defined rotational position in relation to the non-circular mouth area.

This often leads to handling problems in the use of the setting tool, for example when the handle is placed close to the wall, it comes to lie so close to the wall that it cannot be grasped satisfactorily and thus the setting tool cannot be properly guided.

The invention has for its object to provide a generic, powder-powered bolt gun with laterally protruding handle, mouth part and pressure device, which has a sliding pressure sensor relative to the mouth part, which allows a quick change of the mouth part without auxiliary tools and also a proper grip in every application the handle allows.

According to the invention the object is achieved by the characterizing features of claim 1.

A rotatability of the mouth part in relation to the housing permits the one suitable for the respective application Position of the handle. The rotatability of the mouth part which is axially displaceable to a limited extent results from the fact that the radian of the clear width of the receiving openings is greater than the radian of the outer contour of the stop elements. By symmetrically arranging the slinging means and holding stops in pairs, the mouth part can optionally be locked in the housing offset by half a turn.

To achieve the respective locking position, the mouth part is inserted into the housing in the position in which the receiving elements are opposite the stop elements in the axial projection. In order to achieve the rearward position of the mouth part when it is pushed in, the stop elements can be immersed in the receiving openings until the stop means of the mouth part and housing run onto one another and prevent further insertion. In this rearward position of the mouth part, the holding stops formed by shoulders on the mouth part and counter-shoulders on the housing are mutually axially at least around the dimension of the stop elements which project axially beyond the stop plane of the stop means and overlap one another in axial projection.

By pressing the setting tool against a surface on the muzzle side, the contact pressure sensor is shifted backwards in the ignition-ready position and thereby tensioning the tensioning spring of the ignition mechanism. The ignition-ready position is reached when the free end face of the pressure sensor is flush with the free end face of the mouth part located in the rearward position.

For the removal of the mouth part, the shoulders and counter shoulders are brought out of the mutual overlapping position. The mouthpiece can then be removed. In the rotational positions of the mouth part which exclude the overlapping of shoulders and counter shoulders, it is not possible to move the mouth part to the rear position to move, since the stop elements run axially on the areas of the end face of the other part which serve as stop means. In the unlocked rotational position of the mouth part, it is consequently impossible to move the pressure sensor into the ignition-ready position.

The receiving openings are preferably arranged on the housing and the stop elements on the mouth part. Cams are suitable as stop elements, which can be fixed interchangeably on the base body of the mouth part.

For the changing uses, sufficient rotatability between the mouth part and the housing is achieved, as proposed, by the arc dimension of the inside width of the receiving openings exceeding the arc dimension of the outer contour of the stop elements by two to five times.

According to a further proposal of the invention, the shoulders on the mouth part are formed by an end face, which is exposed to the mouth, of a guide connecting piece which adjoins the stop means against the setting direction. The shoulders can be created by the rear axial outlet in cross-section essentially sickle-like recesses and are expediently in the axial projection to the stop elements.

Preferably, the counter shoulders on the housing are formed by an end face which is exposed towards the ignition mechanism and has latches which are radially inserted into a receiving bore for the guide stub. The bolts can be mounted in a stationary part of the housing or in a housing-side receiving body that can be displaced to a limited extent, normal to the driving-in axis.

To achieve automatic engagement, the bolts are advantageously pressed radially against the guide stub by spring means.

To remove the mouth part, the shoulders and counter shoulders must be brought out of their effective overlap. This is accomplished by disengaging the bolts, for which purpose, according to a preferred embodiment, control cams for the bolts which are radially approaching the circumference of the guide socket in the circumferential direction of the shoulders are provided on the mouth part on the mouth side. The bars can then be disengaged after the opening part has been pulled forward to extend the stop elements from the receiving openings by partially turning the opening part. In the disengaged position, the bolts rest on the round circumferential contour of the guide socket, so that the mouth part can be pulled off to the front.

The control cams can form the base of the crescent-like recesses. Through a stepwise transition in the circumferential direction from the base of the recesses into the round circumferential contour of the guide socket, in cooperation with the bolts which are radially supported on the mouth part under spring force, a rotation limitation of the mouth part which can only be overcome by applying an increased torque is achieved. The mouth part can thus not automatically turn into the unlocked position in the advanced position.

In order to achieve a rotational locking in different rotational positions in the area of the free rotatability of the locked mouth part, the control cams can be divided in the circumferential direction into flat polygonal sections. The latches, which are spring-loaded against the control cams, are each supported on one of the flat polygonal sections with their preferably flat contact surface. A conversion into a different rotational position is possible against the force of the spring means acting on the bolt by turning the mouth part further.

In a further development of the invention, the end of the guide stub facing away from the mouth faces one against the other Setting direction tapered section for radial disengagement of the bolt. The taper is formed, for example, by insertion surfaces approaching the round circumferential contour from the rear end to the front. This greatly simplifies the insertion and locking of the mouth part. When inserting the mouth part against the force of the spring means, the bolts are disengaged radially onto the round circumferential contour via the insertion surfaces and then resiliently lie against the control cams.

According to a further proposal, the mouth part has a breakthrough which enters the mouth bore laterally, with an adjoining receiving channel for the fastening elements. The receiving channel is expediently formed by a hollow profile which serves as a handle which makes handling easier for locking and unlocking the mouth part. In this arrangement, the pressure sensor is expediently designed as a pin which is guided radially offset from the driving-in axis and which can be shifted backwards from a front position projecting beyond the mouth, pressing against the surface, into the ignition-ready position. The pressure sensor tensions the tension spring of the ignition mechanism, for example with the interposition of a guide bush for the driving piston.

Fig. 1

Einen Längsschnitt durch das Bolzensetzgerät, in Ruhestellung;

Fig. 2

einen Schnitt durch das Setzgerät nach Fig. 1, gemäss Schnittverlauf II-II;

Fig. 3

einen Schnitt analog Fig. 2 durch das Setzgerät, in Zündbereitschaftsstellung;

Fig. 4

einen vergrösserten Schnitt IV-IV durch das Setzgerät nach Fig. 3;

Fig. 5

einen vergrösserten Schnitt V-V durch das Setzgerät nach Fig. 4;

Fig. 6

einen Schnitt analog Fig. 2 durch das Setzgerät mit entriegeltem Mündungsteil in Ansicht;

Fig. 7

eine perspektivische Explosionsdarstellung des Mündungsteiles und der mit diesem in Verbindung stehenden Anschlussteile.

The invention is explained in more detail below with reference to drawings which show an exemplary embodiment of a bolt-setting tool. Show it:

Fig. 1

A longitudinal section through the bolt gun, in the rest position;

Fig. 2

a section through the setting tool of Figure 1, according to section line II-II.

Fig. 3

a section analogous to Figure 2 by the setting tool, in the ignition ready position.

Fig. 4

an enlarged section IV-IV through the setting tool according to Fig. 3;

Fig. 5

an enlarged section VV through the setting tool of FIG. 4;

Fig. 6

a section similar to Figure 2 through the setting tool with unlocked mouth part in view.

Fig. 7

a perspective exploded view of the mouth part and the connecting parts connected to it.

The setting tool shown in FIGS. 1 and 2 in the rest position has a housing designated overall by 1. This essentially consists of a base body 2 with a laterally molded handle 3 and a receptacle body 4 which can be displaced in the base body 2. a section of the base body 2 facing away from the setting direction is arranged an ignition mechanism which is known per se and is not shown completely. In the front section of the housing 1, a guide bushing, designated overall by 5, is slidably mounted. A driving piston, designated as a whole by 6, is mounted with a head 7 in the guide bush 5 and projects with a front-side shaft 8 into a mouthpiece designated as a whole by 9. The mouth part 9 projects with a rear guide stub 10 into a receiving bore 11 of the receiving body 4 of the housing 1 and is axially displaceably and releasably locked therein. A pressure sensor 12 slidably penetrates the mouth part 9 parallel to the piston axis.

When the setting tool is in the rest position, the pressure sensor 12 projects beyond the mouth part 9 in the setting direction and is in contact with the front end face of the guide bushing 5. The opening area, which projects beyond the receiving body 4 in the setting direction of the mouth part 9 has a non-circular circumferential contour and laterally protrudes a receiving channel 13 for fasteners 14 detachably connected to one another in the form of nails. An opening 16 is provided in the wall of the mouth part 9 for the entry of the fastening elements 14 into a mouth bore 15.

For the axially displaceable connection of the guide bushing 5 to the receiving body 4, a spring clip 17 immovably mounted in the receiving body 4 projects into recesses 18a, 18b closed on the front and rear on the outer contour of the guide bushing 5. A tapered bearing bore 21 for powder propellant charges known per se, such as cartridges, opens into a guide bore 19 for the head 7 of the driving piston 7. The latter, in magazine form in strips, are fed in via a transverse channel 22. In the guide bush 5, as shown in FIG. 2, a dowel pin 23 is inserted in a fixed position on the rear, which acts with its region protruding counter to the setting direction on a drive pin 24 of the ignition mechanism arranged transversely thereto.

The driving pin 24, as can be seen in FIG. 2, is fixed in a firing pin 25 which is displaceably mounted on the housing side, the firing tip 26 of which lies in the axial projection of the bearing bore 21. A tension spring 27, which stores the ignition energy, acts on the ignition pin 25 in the setting direction via the driving pin 24.

The ignition mechanism is tensioned by pushing the guide bush 5 back into the ignition ready position which can be seen in FIG. 3. The dowel pin 23 displaces the driving pin 24 and thus also the ignition pin 25 against the force of the tension spring 27 to the rear.

To trigger the ignition process, the ignition pin 25 is rotated slightly in a known manner by actuating a trigger 28, as a result of which the driving pin 24 is removed from the effective range of the dowel pin 23 arrives and the ignition pin 25 swings forward against the powder drive charge.

The locking of the mouth part 9 in the receiving body 4 is accomplished by segment-shaped latches 31a, 31b, which are radially displaceably mounted in windows 32a, 32b of the receiving body 4 and are engaged by axially spring 33 in axially limited recesses 34a, 34b. The mouth part 9 has in the guide socket 10 receiving the recesses 34a, 34b a round circumferential contour corresponding to the receiving bore 11 of the receiving body 4. The rear outlet of the recesses 34a, 34b forms shoulders 34c, 34d which are axially projected from the opposing shoulders 31c, 31d of the latches 31a, 31b. The shoulders 34c, 34d together with the counter shoulders 31c, 31d serve as stop stops limiting the forward movement of the mouth part 9.

In the direction of rotation or direction of rotation of the mouth part 9, the bottom of each recesses 34a, 34b approaches the round circumferential contour as a control curve designated as a whole with 34e, 34f. As illustrated in FIG. 4, the control cams 34e, 34f are formed by flat polygonal sections 34g, 34h, 34i and 34j, 34k, 34l, on which the bolts 31a, 31b on the opposite side are supported under spring force with a flat contact surface 31e, 31f . Rotation of the mouth part 9 relative to the housing 1 is possible in each case by overcoming the spring force, as is indicated by the rotary end positions of the receiving channel 13 indicated by the dot-dash line.

If the mouth part 9 is rotated beyond these rotational positions, the bolts 31a, 31b are pushed out of the recesses 34a, 34b by the control cams 34e, 34f and come to rest on the round circumferential contour of the guide socket 10. This makes it possible to pull the mouth part 9 forward. The insertion of the mouth part 9 into the receiving body 4 takes place only by pushing it in, whereby the latches 31a, 31b are radially disengaged on the round circumferential contour via insertion surfaces 35a, 35b diverging from one another in the setting direction, in order then to move into the recesses 34a, 34b.

For safety reasons, the setting process can only be triggered when the mouth part 9 is locked. In the unlocked rotational position of the mouth part 9, the pressure sensor 12 provided for moving the guide bush 5 in the ignition-ready position cannot be sufficiently moved backwards. For this purpose, the mouth part 9 has stop elements 36a, 36b designed as cams, which in the locked position of the mouth part 9, when it is moved backwards, plunge into front-side receiving openings 37a, 37b of the receiving body 4, as is the case in comparison of FIG. 2 with FIG. 3 Expression comes. In the rearwardly displaced position of the mouth part 9, it can be pivoted relative to the housing 1 to the extent of the pivoting mirror of the stop elements 36a, 36b in the receiving openings 37a, 37b, which is indicated by the dot-dash line in FIG. 5. This swivel path corresponds to the overlap of the counter shoulders 31c, 31d with the shoulders 34c, 34d.

The displacement of the mouth part 9 backwards is limited by stop means, which are formed by areas 38a, 38b of an essentially annular end face on the mouth part 9 on the one hand and by areas 39a, 39b of an essentially annular end face on the receiving body 4. By pressing the setting tool against one Background 41, it is possible to set the pressure sensor 12 backwards in the ignition-ready position both by the amount of the protrusion of the mouth part 9 shown in FIG. 1 and by the amount of displacement of the mouth part. The pressure sensor 12 takes the guide bush 5 against the force of the tension spring 27, so that it is sufficiently tensioned for the ignition process.

To remove the mouth part 9, it must first be pulled forward until the stop elements 36a, 36b lie outside the receiving openings 37a, 37b. Only then can the mouth part 9 be pivoted to disengage the bolts 31a, 31b and then be pulled forward.

If the setting tool is pressed against the base 41 on the mouth side in the unlocked rotational position of the mouth part 9, the stop elements 36a, 36b run onto the areas 39a, 39b of the receiving body 4, as is shown in simplified form in FIG. 6. When the setting tool is pressed on, the contact pressure sensor 12 can only be displaced backwards flush with the mouth part 9 relative to the housing 1 by the amount of its protrusion (FIG. 1); a complete pushing back of the pressure sensor 12 in the ignition-ready position is not possible because of the prevented displaceability of the mouth part 9.

Fig. 7 illustrates the structure of the connection of the mouth part 9 with the connecting parts and the formation of these parts in particular.

Claims (9)

1. An explosive-powered pin setting tool having a housing (1) having a laterally protruding handle (3), a detonation mechanism with tension spring (27) in the housing (1), a muzzle part (9) projecting beyond the housing (1) in the setting direction and having a non-circular peripheral contour, which is displaceable relative to the housing (1) into a front position against retaining stops and into a rearward position against stop means, and a pressure (12) which is displaceable relative to the muzzle part (9) into a detonation readiness position cocking the tension spring (27) and the free end face of which in the detonation readiness position is flush with the free end face of the muzzle part (9) which is situated in the rearward position, characterised in that the muzzle part (9) is rotatable relative to the housing (1) about its longitudinal axis, the stop means are formed by regions (39a, 39b; 38a, 38b) of mutually facing end surfaces of the housing (1) and the muzzle part (9), one of the parts (1, 9) has stop elements (36a, 36b) projecting axially beyond the stop plane of the region (39a, 39b; 38a, 38b) and the other of the parts (1, 9) has the reception apertures (37a, 37b) for the stop elements (36a, 36b), and in that the retaining stops are formed by shoulders (34c, 34d) on the muzzle part (9) and counter-shoulders (31c, 31d) on the housing (1), in which respect in the rearward position of the muzzle part (9) the shoulders (34c, 34d) are remote from the counter-shoulders (31c, 31d) at least by the extent by which the stop elements (36a, 36b) project axially beyond the stop plane and the shoulders (34c, 34d) and counter-shoulders (31c, 31d) can be brought from a functional position, in which they overlap in their axial projection, into a removal position, in which they do not overlap in their axial projection, for the muzzle part (9).
2. A setting tool according to claim 1, characterised in that the reception apertures (37a, 37b) are arranged on the housing (1) and the stop elements (36a, 36b) are arranged on the muzzle part (9).
3. A setting tool according to claim 1 or 2, characterised in that the arcuate measure of the inside diameter of the reception apertures (37a, 37b) exceeds by two to five times the arcuate measure of the outer contour of the stop elements (36a, 36b).
4. A setting tool according to one of claims 1 to 3, characterised in that the shoulders (34c, 34d) on the muzzle part (9) are formed by an end face, exposed towards the muzzle, of a guide connecting-piece (10) linking, contrary to the setting direction, on to the stop means (38a, 38b).
5. A setting tool according to claim 4, characterised in that the counter-shoulders (31c, 31d) on the housing (1) are formed by an end face, exposed towards the detonation mechanism, of lock bolts (31a, 31b) radially engaged into a reception bore (11) for the guide connecting-piece (10) of the muzzle part (9).
6. A setting tool according to claim 5, characterised in that the lock bolts (31a, 31b) are forced by spring means (33) radially towards the guide connecting-piece (10) of the muzzle part (9).
7. A setting tool according to claim 5 or 6, characterised in that control cams for bolts (31a, 31b) are provided on the muzzle part (9) at the muzzle side to the shoulders (34c, 34d), radially approaching the circumference of the guide connecting-piece in the circumferential direction thereof.
8. A setting tool according to one of claims 5 to 7, characterised in that the end, remote from the muzzle, of the guide connecting-piece (10) has a portion tapered contrary to the setting direction for the radial disengagement of the lock bolts (31a, 31b).
9. A setting tool according to one of claims 1 to 8, characterised in that the muzzle part (9) has an aperture (16), entering laterally into the muzzle bore (15), carrying channel (13) for the fastening elements (14) linking thereto.

Images