EP3541574A1

EP3541574A1 - Setting appliance with axially blockable drive shafts, setting method and expansion anchor therefor

Info

Publication number: EP3541574A1
Application number: EP17797309.6A
Authority: EP
Inventors: Huu Toan NGUYEN; Martin Noser
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 2016-11-17
Filing date: 2017-11-07
Publication date: 2019-09-25
Also published as: TWI664059B; CN109963693A; CN109963693B; WO2018091313A1; TW201819779A; EP3323556A1; US20190275653A1

Abstract

The invention relates to a setting appliance (1) for an expansion anchor (10), which has an expansion sleeve (11) and an expansion body (15), arranged in the expansion sleeve (11), for the expansion sleeve (11), having an inner drive shaft (20) for axially driving the expansion body forward in the expansion sleeve (11), having an outer drive shaft (30), surrounding the inner drive shaft (20), for rotationally driving and axially driving the expansion sleeve (11) forward into a substrate (6), wherein the inner drive shaft (20) has, in a rear region, a plug-in end (29) for inserting into a percussion drilling machine, and wherein the outer drive shaft (30) is mounted on the inner drive shaft (20) so as to rotate therewith and at the same to be axially displaceable at least within limits, and having a releasable blocking device with which, in order to transmit forwardly directed axial forces from the inner drive shaft (20) to the outer drive shaft (30), a forward axial displacement of the inner drive shaft (20) relative to the outer drive shaft (30) is temporally limitable. The invention also relates to a setting method and to an expansion anchor (10).

Description

Hilti Aktiengesellschaft in Schaan Principality of Liechtenstein

Setting device with axially lockable drive shafts, setting method and expansion anchor for this purpose

The invention relates to a setting tool for an expansion anchor, which has an expansion sleeve and an expansion sleeve arranged in the expansion sleeve for the expansion sleeve, a setting method for an expansion anchor, an expansion anchor and a combination of a setting tool and an expansion anchor.

For example, from DE2617212 A1 expansion anchors are known which consist of an expansion sleeve with a forwardly tapered expansion channel and an expansion body, which is arranged in the expansion channel. For anchoring the spreader is driven in the expansion channel forward against the taper, where the spreader expands the expansion sleeve. A tool with a journal for the axial advancement of the expansion body in the expansion channel is known for example from DE102012221 1 14 B3, according to DE 102012221 1 14 B3 on the pin a drill is attachable.

In DE7634992 111, a further expansion anchor with a forwardly tapered expansion channel, in which an expansion body is driven, described, wherein the expansion anchor according to DE7634992 U1 is self-drilling. In particular, the expansion anchor of DE7634992 U1 has a drill bit on the front end side of the expansion sleeve and groove-shaped depressions on the rear end face of the expansion sleeve for transmitting a rotational movement to the expansion sleeve.

Further expansion anchors are known from US2707897 A. This document teaches to use the expansion anchors drilled in advance with a drill, cylindrical bores, and to put the expansion during rotation of the expander against the taper of the Spreizkanals by means of a setting device, which engages in the expansion sleeve, whereby a conical in the substrate Undercut is formed. For cutting this undercut, the expansion sleeves of US2707897 A at the height of the taper cutting elements. According to JP6009931 1 U1, the expansion body of an expansion anchor is driven by rotation of an additional element of the expansion body in an internal thread of the expansion sleeve axially forward against the taper of the expansion channel.

DE102008044124 A1 and DE102007000235 A1 show setting devices for screw-in insulating dowels. The setting devices each have two coaxial waves, which are rotationally coupled after reaching a certain depth.

Various anchor devices, each having drill bits for self-drilling seating, are known from US6250866 B1, US20080008553 A1 / US8662806 B2 / US8266779 B2, EP0845605 B1, US7070376 B1, US4386882 A, US8070405 B2 and EP2366869 A2. DE10201 1003290 A1 shows a screw which is radially expanded in the hole.

DE 90 02 569 U shows a dowel with a sleeve which slides when setting on a cone converging towards the sleeve, and a setting tool for this dowel. The setting tool acts against the sleeve and has an insulating ring, which passes the hammer blows only attenuated to the sleeve when used on a percussion drill.

DE 1 885 659 U shows a self-drilling expansible plug, which has outside Kerbringe.

EP 1 957 806 A2 and the underlying WO 2007/086988 A2 show an expandable self-drilling screw.

The European patent application with the registration file 16159173.0 describes flat inserts which are drilled in concrete, and which may have hard cutting for this purpose.

The ICC-ES Evaluation Report ESR-3912, issued 10/2016, describes an undercut anchor with an expansion sleeve, which is pushed by means of a rigid setting device rotationally driven on a cone arranged in front of the expansion sleeve, whereby an undercut is formed in the substrate.

The object of the invention is to provide a setting device for an expansion anchor, a method for setting an expansion anchor and an expansion anchor with which at low cost, Good handling and high reliability in a simple way good load values can be obtained.

The object is achieved by a setting device with the features of claim 1, a setting method with the features of claim 10 and an expansion anchor with the features of claim 12. Preferred embodiments are given in the dependent claims.

An inventive setting device for an expansion anchor, which has an expansion sleeve and an expansion sleeve arranged in the expansion body for the expansion sleeve, is formed:

with an inner drive shaft for axially advancing the expansion body in the expansion sleeve,

with an outer drive shaft surrounding the inner drive shaft for rotationally driving and axially advancing the expansion sleeve into a substrate,

wherein the inner drive shaft in a rear region has a spigot for insertion into a percussion drill, and

wherein the outer drive shaft rotatably and at the same time axially displaceably mounted at least within limits on the inner drive shaft,

and with a releasable locking means for temporarily transferring axial forward displacement of the inner drive shaft relative to the outer drive shaft for transmitting forward axial forces from the inner drive shaft to the outer drive shaft.

A first basic idea of the invention can be seen in a setting tool which permits a self-drilling and, in addition, self-intersecting setting of an expansion anchor with an internal expansion body. The setting tool has an inner drive shaft, which is coupled at its rear with a percussion drill, and which acts on its front against the expansion body of the expansion anchor in order to advance the expansion body relative to the expansion sleeve of the expansion anchor. Furthermore, the setting tool has an outer drive shaft, which surrounds the inner drive shaft, and which acts on its front against the expansion sleeve to drive the expansion sleeve rotationally or rotationally driven into the substrate. The outer drive shaft is permanently rotationally coupled to the inner drive shaft, so that in each phase of the setting process applied by the percussion drill on the inner drive shaft rotational movement of the inner drive shaft to the outer drive shaft and from this in turn can be transferred to the expansion sleeve. In particular, the expansion sleeve can thus be used both in a first phase of setting driving, in which the expansion anchor is drilled self-drilling into the substrate, as well as in a second phase of the setting process, in which the expansion anchor is selbstninterschneidend expanding, by means of the same element, namely by means of the outer drive shaft rotated. The outer drive shaft is, at least in limits, that is, at least over a certain axial distance, axially relative to the inner drive shaft slidably disposed on the inner drive shaft, while maintaining the rotationally fixed connection between the inner drive shaft and the outer drive shaft. Due to this axial displacement can be loaded axially by the axial loading of the inner drive shaft by means of percussion drill exclusively applied to the inner drive shaft spreader, whereas the expansion sleeve remains axially unloaded, with the result that the spreader relative to the expansion after driven in the front of the region of the taper of the Spreizkanals and the expansion sleeve can thus be expanded radially. Since, in spite of the axial decoupling of the two drive shafts, the rotational coupling of the two drive shafts persists in the second phase of the setting process, the expansion sleeve can be simultaneously rotated by the percussion drill around its longitudinal axis during radial expansion of the expansion sleeve, with the result that substrate rotates on the circumference of the expansion sleeve scraped off and thus undercut can be produced in the substrate in a particularly effective manner.

In addition, according to the invention, a releasable locking device is provided, with which, in a locked state of the locking device, the axial displacement of the outer drive shaft on the inner drive shaft is at least backwards temporarily blocked, that is, with which the two drive shafts are temporarily so axially fixed coupled in that axial forces directed at least from the inner drive shaft to the outer drive shaft can be transmitted. This locking device is locked during the first phase of the setting process, which has two effects: First, applied by the percussion drill on the inner drive shaft axial shocks from the inner drive shaft to the outer drive shaft and from this in turn are transferred to the expansion sleeve, so that the expansion sleeve can be rotationally driven in the first phase of the setting process, which in turn allows a particularly effective drilling of the expansion anchor in hard substrates. On the other hand can be prevented by the initially locked locking device that the inner drive shaft acts on the spreader already in the first phase of the setting process, that is, it can be ensured that only begins with the expansion of the expansion sleeve and the creation of the undercut if the expansion anchor is already driven a little way into the substrate, with the result that a particularly well located undercut is obtained. In the second phase of the setting process following the first phase, the uncovered clean direction and the two drive shafts are thus released for an axial relative displacement, with the result that, as already described above, the inner drive shaft can be advanced in the outer drive shaft and the spreader can be driven in the expansion sleeve, without the expansion deeper into the Substrate substrate. In particular, the blocking device can also be referred to as a switchable blocking device. In particular, it is switchable between a blocking position and a release position and / or switchable between the locked state of the locking device and the state in which the locking device is released.

Thus, by means of the invention, a setting device is provided with which an expansion anchor can be drilled into the substrate, an undercut can be produced in the substrate, and the expansion anchor can be anchored in the undercut, specifically in a continuous setting process in which it is not necessary to set the setting device implement, and thus is particularly simple, with a very small number of steps and / or tools and particularly reliable feasible. Due to the arrangement of the expansion anchor in an undercut particularly good load values can be achieved, which are also relatively insensitive to possible residues of debris in the borehole. In addition, an automatic adaptation to different crack widths in the substrate may be possible.

In particular, the inner drive shaft for conditioning, preferably for direct contact, suitable for the expansion body. Preferably, the front end face of the inner drive shaft is at least partially free for the purpose of conditioning the spreader.

As far as here of the radial direction, the axial direction and / or the circumferential direction is mentioned, and as far as here is a rotation of the speech, this should refer in particular to the longitudinal axis of the two drive shafts, ie preferably on that axis, with respect to those the two drive shafts are arranged coaxially. The directional indications "front" and "rear" or "rearward" are to be understood here uniformly, relative to the same axis, wherein this axis may be in particular the longitudinal axis of the two drive shafts Propelling the expansion sleeve into the substrate an absolute movement of the expansion body or the expansion sleeve forward, in the same spatial direction, in particular in the forward direction, in particular, it can be provided that the inner drive shaft for axial, in the forward direction propelling the expansion body in the expansion sleeve and the outer drive shaft for rotationally driving and axial, forwardly advancing the expansion sleeve are provided in the substrate under the rotationally fixed mounting of the outer drive shaft to the Inner drive shaft can be understood in a professional way in particular, that the inner drive shaft rotatably entrains the outer drive shaft. The non-rotatable mounting is given in particular about the longitudinal axis of the two drive shafts. Since the direction of rotation of a percussion drill regularly does not reverse during the drilling process, a rotation-proof arrangement in only one direction of rotation could be sufficient. Preferably, however, the outer drive shaft is rotatably mounted in both opposite directions of rotation on the inner drive shaft, which may be advantageous in terms of application safety and manufacturing costs. The outer drive shaft is used inter alia for rotationally driving the expansion sleeve about the longitudinal axis of the two drive shafts. The insertion end serves to couple the output of the percussion drill with the inner drive shaft, in particular for a transmission of a rotational movement and axial strokes from the output to the inner drive shaft. At the insertion end, the inner drive shaft may preferably have a driver profile. The outer drive shaft is preferably shorter in the axial direction than the inner drive shaft. The outer drive shaft is in particular designed as a hollow shaft, so that the inner drive shaft can pass through the outer drive shaft. The inner drive shaft and / or the outer drive shaft is preferably made of a metal material, which may also be coated. The inner drive shaft may be formed in one piece or several pieces. Likewise, the outer drive shaft may be formed integrally or in several pieces. The substrate is preferably made of a mineral building material, in particular concrete.

The expansion anchor, which is set with the setting device in the setting process, in particular has an expansion sleeve with a forwardly tapered expansion channel, that is, with a spreading channel whose cross-section decreases towards the front. In particular, the expansion anchor can also be referred to as a hammer anchor. The expansion anchor also has an expansion body, which is arranged in the expansion channel. For anchoring the spreader is driven in the expansion channel forward against the taper, where the spreader expands the expansion sleeve. In a rear region, the expansion sleeve has a, in particular on the inside of the expansion sleeve arranged load application device for introducing tensile forces in the expansion sleeve, wherein the load application device is preferably an internal thread. Conveniently, the expansion sleeve is slotted in a front region, in particular provided with at least one axially extending slot, which can support the expansion process. Also with regard to the support of the expansion process, the expansion channel may preferably form a passage opening in the expansion sleeve.

It is particularly preferred that the inner drive shaft is at least partially a hollow shaft, ie an element with an inner, in particular axially extending Channel. This can be dissipated in a particularly simple manner during setting process resulting drilling dust. In particular, the hollow shaft is thus a hollow shaft for discharging accumulating when setting the expansion anchor drilling dust. Preferably, the hollow shaft is open to the front, to allow a frontal entry of drill dust. Additionally or alternatively, radially extending channels may be provided in the hollow shaft. Conveniently, the setting tool has a rotary feedthrough for discharging material from the designed as a hollow shaft, rotating inner drive shaft, so preferably a passage for a sealed material transition from the rotating inner drive shaft in a fixed body. For a particularly simple construction, the rotary feedthrough is preferably arranged axially between the insertion end and the outer drive shaft on the inner drive shaft. Through the hollow shaft drilling dust can be removed particularly effectively, so that a particularly clean hole with a particularly advantageous for the attachment point geometry can arise.

Furthermore, it is particularly advantageous that the releasable locking device has at least one radially displaceable stop element which can be brought to limit the axial displacement of the inner drive shaft relative to the outer drive shaft forward in a locking position in which the stop element between the outer drive shaft and the inner Drive shaft is located. In particular, in the blocking position, the stop element can be located axially between the outer drive shaft and the inner drive shaft in a position overlapping both the outer drive shaft and the inner drive shaft. In the locked position, the outer drive shaft and at the rear of the stop element strike the inner drive shaft on the stop element at the front of the stop element, so that the axial displacement of the inner drive shaft in the outer drive shaft is limited by the front stop element. Thus, a particularly simple and reliable limitation of the axial displacement is possible. In particular, it can be provided that the inner drive shaft has a forwardly facing shoulder, preferably annular shoulder, and that the stop element abuts in the locked position to the rear end face of the outer drive shaft and the forwardly facing shoulder of the inner drive shaft, which is the design effort and further reduce manufacturing costs and increase reliability even further. The stop element is displaceable between the locking position just described and a release position, preferably radially displaceable, wherein in the release position caused by the locking device in the locked position limiting the axial displacement is canceled. Expediently, the setting tool has a housing with a passage opening in which the outer drive shaft and the inner drive shaft are rotatably mounted. This housing may form a handle and / or a receptacle for the expansion anchor, which can further improve the handling.

It is particularly preferred that the housing has a receptacle for receiving the radially displaceable stop element in the release position. In particular, it can be provided that the housing holds the stop element in its locking position until the stop element, in particular with increasing Bohrfortschritt, axially reaches the area of the receptacle and is then urged by a spring mechanism into the receptacle. As a result, an automatic release of the locking device in the transition from the first phase to the second phase of the setting process can be realized in a particularly simple and reliable manner.

Conveniently, the stop element is a, in particular ring segment-shaped, spring, which can automatically enter the receptacle. According to this embodiment, the spring force of the spring mechanism just mentioned comes from the stop element itself, which can further reduce the design effort.

A further preferred embodiment of the invention is that provided on the inner drive shaft at least one shoulder for limiting a displacement of the inner drive shaft relative to the outer drive shaft and / or the housing forward, in particular at the end of the setting process, preferably at the end of the second phase is. This can be ensured in a particularly simple manner that the spreader is not driven excessively far into the expansion sleeve, which may be advantageous in terms of load behavior. The at least one shoulder may in particular be an annular shoulder. In particular, the shoulder already mentioned above may be the at least one shoulder. The at least one shoulder may be provided for abutment with the outer drive shaft or for striking the housing. It can also be provided at least one shoulder for abutment on the outer drive shaft and at least one shoulder for abutment on the housing. Two shoulders can further improve reliability.

Preferably, the inner drive shaft is accessible at its front end, so that the inner drive shaft can act for the axial propulsion of the expansion body against the expansion body. Furthermore, it is particularly advantageous that the inner drive shaft protrudes in a locked state of the locking device forward over the outer drive shaft. Under the locked state of the locking device can be understood in particular a state in which the locking device temporarily limits the axial displacement of the inner drive shaft relative to the outer drive shaft forwards or / and a state in which the stop element is in the locked position. According to this embodiment, the inner drive shaft at the beginning of the first phase of the setting process projecting forward over the outer drive shaft, so that the inner drive shaft may form a pin on soft the expansion sleeve of the expansion anchor can be plugged. This allows a particularly good centering and thus reliability and / or a particularly good handling. Moreover, in this embodiment, a particularly small displacement of the inner drive shaft may be given at the transition between the first phase and the second phase of the setting process, and preferably, the inner drive shaft may abut the spreader already in the first phase. As a result, abrupt movements can be avoided and the load of the setting tool and / or the drill can be further reduced.

Furthermore, it is particularly expedient that the outer drive shaft is rotatably fixed by means of a peripheral toothing and at the same time is mounted axially displaceably on the inner drive shaft, at least within limits. Such teeth have teeth on the outer circumference of the inner drive shaft and corresponding thereto teeth on the inner circumference of the outer drive shaft. As a result, a structurally particularly simple embodiment is given. The peripheral toothing may in particular be a splined toothing.

Another particularly useful development of the invention is that the outer drive shaft front has a driver profile for a rotary coupling with the expansion sleeve. Such a driver profile allows a positive rotational coupling, so a rotary coupling by means of corresponding shapes, which allows a particularly effective transmission of rotation. In particular, the driver profile may have front teeth arranged on the outer drive shaft front teeth, that is, it can be provided via a spur toothing coupling. In this case, arranged on the expansion anchors counter profile can be made very easy to Mitnehmerprofil. At least a portion of the spinal teeth may preferably be splines.

The invention further relates to a method for setting an expansion anchor, which has an expansion sleeve and an expansion body arranged in the expansion sleeve for the expansion sleeve, in a substrate in which in a first phase, the expansion sleeve rotating in the Substrate is driven, and advanced in a subsequent second phase of the spreader in the expansion sleeve and thereby the expansion sleeve is widened front, wherein the expansion sleeve is also rotated, in particular rotated about the longitudinal axis. In this way, the expansion anchor can be set self-drilling and self-tailing, which allows particularly good load values in a particularly simple manner. The undercut, which widens in particular towards the front, is produced in the second phase, namely by the combination of turning and widening.

In particular, it can be provided that both the first phase and the second phase are carried out by means of a setting device according to the invention. Accordingly, the setting tool is used as intended. Preferably, the setting tool remains in contact with the expansion anchor between the first phase and the second phase.

The invention further relates to an expansion anchor, which has an expansion sleeve with an expansion channel, which tapers towards the front, and an expansion element arranged in the expansion channel for the expansion sleeve, wherein at least a first cutting edge and at the peripheral surface of the expansion sleeve at least on the front end face of the expansion sleeve a second cutting edge is formed. Such an expansion anchor is particularly suitable for use together with a setting tool according to the invention and / or in a method according to the invention. The at least one first cutting edge can assist the drilling of the expansion anchor in the first phase particularly well, and the at least one second cutting edge, the creation of the undercut in the second phase.

The at least one second cutting edge may extend in particular along the longitudinal axis of the expansion anchor and particularly preferably run parallel to the longitudinal axis of the expansion anchor. This can be generated in the second phase by the combination of turning and widening a forward-widening undercut. In particular, the at least one second cutting edge can overlap with the expansion channel viewed in the longitudinal direction of the expansion anchor. As a result, the expansion body can displace the second cutting edge particularly efficiently radially.

The expansion body for the expansion sleeve is preferably arranged completely in the expansion channel. In particular, the expansion body is not available for the expansion sleeve from the expansion sleeve.

In particular, it may be provided that the expansion anchor has a cutting body on which both the at least one first cutting edge and the at least one second cutting edge are formed. So it is a common cutting body vorgese- hen, where both cutting edges are formed. This can be particularly advantageous in terms of manufacturing and / or material costs. The cutting body and the expansion sleeve are preferably separate parts. The cutting body may for example consist of hard metal. The cutting body can also be a specifically hardened area of the expansion sleeve. The cutting body is arranged in particular on the expansion sleeve. Preferably, several cutting bodies are provided.

In order to facilitate the drilling in can be provided that the front end face of the expansion sleeve forms a tip, that is, that it has an opening angle smaller than 180 °. For example, an opening angle of 120 ° +/- 10 ° may be provided.

Finally, the invention also relates to the combination of an expansion anchor according to the invention and a setting tool according to the invention. In particular, the expansion anchor according to the invention can be set particularly efficiently with a setting device according to the invention and / or in a setting method according to the invention.

The features mentioned in connection with the setting tool according to the invention, the setting method according to the invention, the inventive expansion anchor and the combination of features according to the invention should be freely combinable here so that, for example, features which are explained in connection with the setting tool according to the invention can also be used in the setting method according to the invention ,

The invention will be explained in more detail below with reference to preferred embodiments, which are shown schematically in the accompanying figures, wherein individual features of the embodiments shown below can be realized in the context of the invention, in principle, individually or in any combination. In the figures show schematically:

Figure 1: an embodiment of a setting device in side view;

FIG. 2 shows the setting device of FIG. 1 in a longitudinal sectional view A-A according to FIG. 1;

Figure 3: the setting tool of Figures 1 and 2 in cross-sectional view C-C according to Figure 2;

Figure 4: the setting tool of Figures 1 to 3 in a longitudinally sectioned detail to

Beginning of a setting process according to the invention; FIG. 5: the setting device of FIGS. 1 to 3 in a longitudinally sectioned detail view analogous to FIG. 4 at the transition between the first phase and the second phase of the setting method according to the invention;

Figure 6: the setting tool of Figures 1 to 3 in a longitudinally sectioned detail analog

Figures 4 and 5 at the end of the second phase of the inventive setting process; and

Figure 7: an enlarged view of the setting device in an inventive

Method of settable expansion anchor.

Figures 1 to 6 show a first embodiment of a setting device according to the invention, together with an expansion anchor, wherein the sake of clarity, a number of details in the front region of the setting device only in the detail views of Figures 4 to 6 are provided with reference numerals.

The setting tool 1 has a housing 40, which forms a handle, and which is provided with a passage opening 41. In this through hole 41, an inner drive shaft 20 and an outer drive shaft 30 are arranged, wherein the outer drive shaft 30, the inner drive shaft 20 in a front region of the inner drive shaft 20 surrounds. While the outer drive shaft 30 ends in the rear side in the housing 40, the inner drive shaft 20 protrudes from the rear side of the housing 40 and has at a rear portion of a shank 29 for connection to the chuck of a percussion drill, not shown. The inner drive shaft 20, the outer drive shaft 30 and the through hole 41 are arranged coaxially with a longitudinal axis 99.

The outer drive shaft 30 is axially within certain limits, that is arranged in a direction parallel to the longitudinal axis 99, slidably on the inner drive shaft 20. Between the inner drive shaft 20 and the outer drive shaft 30, a circumferential toothing 32 is formed, which transmits a rotational movement from the inner drive shaft 20 to the outer drive shaft 30, without affecting the axial displaceability of the outer drive shaft 30 on the inner drive shaft 20.

As shown particularly in Figures 4 to 6, the inner drive shaft 20 is formed in several parts and consists of two axially separate parts, namely a relatively long rear part, which extends from the insertion end 29 in the housing 40, and a front part. The setting device 1 also has a releasable locking device, which in turn has a stop element 51. This stopper member 51 can be brought into a locking position in which it is located between the inner drive shaft 20 and the outer drive shaft 30 viewed in the axial direction and in which it radially overlaps both the inner drive shaft 20 and the outer drive shaft 30. In particular, the stopper member 51 is in the locking position in front of the inner drive shaft 20 and behind the outer drive shaft 30, preferably in front of a formed on the inner drive shaft 20 shoulder 28 and behind the rear end face of the outer drive shaft 30. Is the inner drive shaft 20 in the outer Drive shaft 30 is displaced forward while the stop member 51 is in the locked position, so a point is reached at which the inner drive shaft 20, in particular with its shoulder 28, abuts the stop member 51 and the stop member 51 in turn with its front on the back the outer drive shaft 30 abuts. Due to this double striking the stop member 51 locks a further axial displacement of the inner drive shaft 20 relative to the outer drive shaft 30 forward, that is, an axial displacement of the inner drive shaft 20 in the outer drive shaft 30 forward is limited by the stop member 51, and it is a transmission of forward axial forces from the inner drive shaft 20 to the outer drive shaft 30 via the stop member 51 away possible. FIG. 4 shows the stop element 51 in the blocking position with the shoulder 28 abutting on the stop element 51 and the outer drive shaft 30 abutting on the stop element 51. The inner drive shaft 20 in this state protrudes a little forward over the outer drive shaft 30.

In the housing 40, a receptacle 45 for receiving the stop element 51 is formed, which radially outwardly adjacent to the passage opening 41. When the abutment member 51 passes axially in front of this receptacle 45, the abutment member 51 may enter the receptacle 45 in a release position in a radially outward movement. In the release position, the stop element 51 is radially offset from the two drive shafts 20 and 30, so that the drive shafts 20 and 30 can no longer strike the stop element 51 in the release position and the stop member 51, the relative axial movement of the two drive shafts 20 and 30 to each other thus no longer limited. In particular, in the release position also no transmission of forward axial forces from the inner drive shaft 20 to the outer drive shaft 30 via the stop member 51 away longer possible. Figure 5 shows the setting tool 1 in a state which is established after the stop member 51 has just entered the receptacle 45 in the release position. As shown, inter alia, FIG. 3, in the illustrated embodiment, the stop element 51 is designed as an open ring, the shoulder 28 as an annular shoulder, and the receptacle 45 in a ring shape. But there are also other configurations possible. In particular, in the illustrated embodiment, the stop member 51 is formed as a spring, which allows an automatic entry of the stop member 51 into the receptacle 45 in the release position by means of spring force, which is stored in the stop member 51 itself. In principle, however, arrangements with inelastic stop element 51 and additional springs are also conceivable.

At the front end face of the outer drive shaft 30, a driver profile 33 is formed with teeth, which can engage the rotatable coupling between the outer drive shaft 30 and an expansion sleeve 1 1 of the expansion anchor 10 to be set in a corresponding profile on the expansion sleeve 1 1 of the expansion anchor 10.

Figures 4 to 6 show the setting tool 1 in different successive stages of a setting method according to the invention. In particular, Figure 4 shows the state of the setting device 1 at the beginning of the first phase of the setting process. In this state, the locking device is with its stop member 51 in the locked position, the outer drive shaft 30 is located on the stop member 51 axially against the shoulder 28 of the inner drive shaft 20, and the inner drive shaft 20 is the front side to form a pin over a piece the outer drive shaft 30 forth. On this pin, the expansion sleeve 1 1 of the expansion anchor 10 is pushed, wherein the pin projects into a formed in the interior of the expansion sleeve 1 1 spreading channel 12, so deep that the rear end face of the expansion sleeve 1 1 rests against the outer drive shaft 30 and in the driver profile 33 of the outer drive shaft 30 engages. Preferably, the arrangement is dimensioned so that in this state, the pin formed by the inner drive shaft 20 abuts a spreader in the expansion channel 12 of the expansion 10 arranged spreader 15 of the expansion anchor 10 or at least not too far away from this.

Now, the setting tool 1 is placed on the front of its housing 40 on a substrate 6 and the inner drive shaft 20 is offset by means of a percussion drill in a rotationally striking movement. The rotational movement of the inner drive shaft 20 is transmitted via the peripheral teeth 32 to the outer drive shaft 30 and from this in turn via the driver profile 33 to the expansion sleeve 1 1 of the expansion anchor 10. The impact movement of the inner drive shaft 20 forward is transmitted via the stop element 51 of the locking device to the outer drive shaft 30 and from this again via its front end face to the expansion sleeve 1 1. As a result, the expansion sleeve 1 1 in the first phase of the setting of the setting tool 1 rotatably moved and thereby drilled into the substrate 6.

When drilling the expansion sleeve 1 1 in the substrate 6, the inner drive shaft 20, the outer drive shaft 30 and axially between these two drive shafts 20 and 30 in radial overlap with the drive shafts 20 and 30 stop member 51 move relative to the housing 40 axially forward , This movement of the drive shafts 20 and 30 and the stop element 51 takes place until the stop element 51 is in axial overlap with the receptacle 45 in the housing 40. Due to spring force, the stop element 51 now jumps radially outward into the receptacle 45 into a release position of the stop element 51. In this release position, the radial overlap of the stop element 51 with at least one of the two drive shafts, preferably with both drive shafts 20 and 30, repealed. Hereby, the axial force transmission from the inner drive shaft 20 from the outer drive shaft 30 and the expansion sleeve 1 1 of the expansion anchor 10 is repealed. This automatically completes the first phase of the setting process and starts the second phase. The resulting stage is shown in FIG.

In the second phase, the applied by the percussion drill inner drive shaft 20 continues to perform a rotationally-striking motion. But since the locking device is now in the release position, only the rotational movement of the inner drive shaft 20 to the expansion sleeve 1 1 pass, namely continue on the peripheral teeth 32 to the outer drive shaft 30 and from there via the driver 33 to the expansion sleeve 1 first The impact movement of the inner drive shaft 20, however, is no longer transmitted to the expansion sleeve 1 1, since the inner drive shaft 20 and the outer drive shaft 30 no longer abut each other in the axial direction. The expansion sleeve 1 1 thus performs in the second phase substantially only a rotational movement. Since, however, due to the released state of the locking device, the inner drive shaft 20 can move axially forward relative to the outer drive shaft 30, the inner drive shaft 20 acts in the second phase, the spreader 15 of the expansion anchor 10 beating and drives the spreader 15 in the spreader 12 of the rotating expansion sleeve 1 1 forward. In this case, the spreader 15 passes into a front, tapered region of the Spreizkanals 12, where the spreader 15, the expansion sleeve 1 1 radially expands. This expansion, in combination with the rotational movement of the expansion sleeve 1 1, generated at the level of the front portion of the expansion sleeve 1 1 an undercut in the substrate 6, in which the expansion sleeve 1 1 is formed. The second phase is preferably completed when the shoulder 28 of the inner drive shaft 20, which in the first phase indirectly, namely on the arrival impact element 51, has struck against the outer drive shaft 30, now abuts directly on the outer drive shaft 30 and / or if a relative to the housing 40 offset rearwardly arranged on the inner drive shaft 20 further shoulder 27 abuts the housing 40 rearwardly. The resulting state is shown in FIG.

By means of the setting tool 1 according to the invention, a borehole can thus be produced by means of a continuous setting process, the expansion anchor 10 can be set and an undercut can be produced. The setting depth and the expansion are ensured by the setting device 1, so that a particularly high level of user-friendliness and security is given. Due to the principle of the undercut, higher loads can be transmitted regularly with the same embedment depth.

The expansion body 15 preferably has a self-locking angle, so that the setting tool 1 can be removed after expansion of the expansion sleeve 1 1 without the expansion sleeve 1 1 moves back to its original position. At an arranged on the expansion sleeve 1 1, pointing into the expansion channel 12 internal thread in the expansion anchor 10, for example, threaded bolts can be attached after completion of the setting process.

In order to be able to return the setting device 1 to the initial state after completion of the second phase of the setting process, one or more restoring elements 48 can be provided in the receptacle 45 for the stop element 51, with which the stop element 51 can be displaced radially inwards , In the present embodiment, two fork-shaped return elements 48 are provided, each having an outside on the housing 40 vortretenden reset button.

As shown in particular Figures 1 and 2, the inner drive shaft 20 is designed in a front region as a forwardly open hollow shaft. About this hollow shaft accumulating drill dust can be removed during the setting process. Behind the housing 40, a rotary feedthrough 49 is provided on the inner drive shaft 20, with which the material can in turn be removed from the hollow shaft.

Figure 7 shows a detailed view of the expansion anchor 10. As can be seen in Figure 7, the front end face of the expansion sleeve 1 1 forms a tip, that is, it has an opening angle less than 180 °, preferably from about 120 °. The expansion sleeve 1 1 of the expansion anchor 10 has on its outer side both frontal cutting edges 17 which support the drilling operation of the expansion sleeve 1 1, as well as peripheral cutting edges 18, which support the expansion of the expansion sleeve 1 1, on. It is particularly preferred that the expansion sleeve 1 1 with cutting bodies 19, preferably made of hard metal, is provided, wherein preferably each of the cutting bodies 19 both an end-side cutting edge 17 and a peripheral cutting edge 18 are formed. In the illustrated embodiment, the expansion sleeve 1 1 and the cutting body 19 are separate parts. But the cutting body can also be specifically hardened areas of the expansion sleeve 1 1. At the rear, that is at the end face opposite the tip, the expansion sleeve 1 1 has a counter-profile for the driving profile 33 of the setting device 1.

In order to be able to produce a conical undercut when the expansion sleeve 1 1 is rotated and expanded by the expansion body 15, the peripheral cutting edges 18 extend along the longitudinal axis 100 of the expansion anchor 10, particularly preferably parallel to this longitudinal axis 100 as shown. The peripheral cutting edge 18 overlaps In particular, the circumferential cutting edges 18, viewed along the longitudinal axis 100, disposed at the level of a front end portion of the Spreizkanals 12, in which the cross section of the Spreizkanals 12 to the front end of the Spreizkanals 12th decreases.

Claims

1 . Setting device for an expansion anchor (10), which has an expansion sleeve (1 1) and a in the expansion sleeve (1 1) arranged expansion body (15) for the expansion sleeve (1 1),

- With an inner drive shaft (20) for axially advancing the expansion body (15) in the expansion sleeve (1 1),

- with an inner drive shaft (20) surrounding outer drive shaft (30) for rotationally driving and axially propelling the expansion sleeve (1 1) in a substrate (6),

- wherein the inner drive shaft (20) in a rear region has a spigot (29) for insertion into a percussion drill, and

- Wherein the outer drive shaft (30) rotatably and at the same time axially slidably mounted at least within limits on the inner drive shaft (20),

- And with a releasable locking device, with the transmission of forward axial forces from the inner drive shaft (20) on the outer drive shaft (30) an axial displacement of the inner drive shaft (20) relative to the outer drive shaft (30) forward temporarily limited is.

2. Setting device according to claim 1,

characterized,

in that the inner drive shaft (20) is at least partially a hollow shaft, and in that the setting device has a rotary feedthrough (49) for discharging material from the rotating inner drive shaft (20).

3. Setting tool according to one of the preceding claims,

characterized,

in that the releasable locking device has at least one radially displaceable abutment element (51) which, for limiting the axial displacement of the inner drive shaft (20) relative to the outer drive shaft (30), can be brought forward into a blocking position in which the abutment element (51) intervenes the outer drive shaft (30) and the inner drive shaft (20) is located.

Setting device according to claim 3,

characterized,

in that the setting device has a housing (40) with a passage opening (41) in which the outer drive shaft (30) and the inner drive shaft (20) are rotatably mounted, wherein the housing (40) has a receptacle (45) for receiving the radial has displaceable stop member (51) in a release position.

Setting device according to claim 4,

characterized,

that the stop element (51) is a, in particular ring-segment-shaped, spring, which can automatically enter the receptacle (45).

Setting tool according to one of the preceding claims,

characterized,

in that on the inner drive shaft (20) at least one shoulder (27, 28) for limiting a displacement of the inner drive shaft (20) relative to the outer drive shaft (30) is provided forwards.

Setting tool according to one of the preceding claims,

characterized,

that the inner drive shaft (20) in a locked state of the locking device projects forward beyond the outer drive shaft (30).

Setting tool according to one of the preceding claims,

characterized,

that the outer drive shaft (30) via a peripheral toothing (32) rotatably and at the same time at least within limits axially displaceable on the inner drive shaft (20) is mounted.

Setting tool according to one of the preceding claims,

characterized,

in that the outer drive shaft (30) at the front has a driver profile (33) for rotational coupling with the expansion sleeve (11), wherein the driver profile (33) has front teeth arranged on the outer drive shaft (30).

10. A method for setting an expansion anchor (10) having an expansion sleeve (11) and in the expansion sleeve (11) arranged expansion body (15) for the expansion sleeve (11), in a substrate (6), in which

- In a first phase, the expansion sleeve (11) is rotationally driven into the substrate (6), and

- In a subsequent second phase of the expansion body (15) in the expansion sleeve (11) is driven and thereby the expansion sleeve (11) is widened at the front, wherein the expansion sleeve (11) is rotated at the same time.

11. The method according to claim 10,

characterized,

in that both the first phase and the second phase are carried out by means of a setting device according to one of claims 1 to 9.

12. expansion anchor (10), which has an expansion sleeve (11) with an expansion channel (12) which tapers towards the front, and in the expansion channel (12) arranged expansion body (15) for the expansion sleeve (11), wherein at the front end surface of the expansion sleeve (11) at least a first cutting edge (17) and on the peripheral surface of the expansion sleeve (11) at least one second cutting edge (18) is formed.

13. expansion anchor (10) according to claim 12,

characterized,

the expansion anchor (10) has a cutting body (19) on which both the at least one first cutting edge (17) and the at least one second cutting edge (18) are formed.

14. expansion anchor (10) according to any one of claims 12 or 13,

characterized,

the front end face of the expansion sleeve (11) forms a point.

15. Combination of an expansion anchor (10) according to any one of claims 12 to 14 and a setting tool according to one of claims 1 to 9.