EP0818279A1 - Setting tool for self-cutting undercut anchor - Google Patents

Abstract

The setting tool comprises a rotatable forward propelling part (2) for the sleeve (9) of the rear cut anchor (6) to interact with a support element (4) which is supported relative to the foundation base (G) and has a socket (5) for axially fixing the rear end of the anchor rod (7) opposite the cone (8). The forward propelling part can be axially displaced opposite the support element with the maximum displacement corresponding to the desired displacement path of the sleeve along the anchor rod. The propelling part and support element are aligned so that the socket for the anchor rod is mounted in the axial extension of the insert end (3). The socket has an internally threaded bore for the externally threaded rear end of the anchor rod.

Description

The invention relates to a setting tool for self-tapping undercut anchors according to the preamble of claim 1.

For fastenings that are exposed to high tensile loads, especially for Security-relevant fastenings often come with form-fitting anchors for use. Due to the form fit, spreading forces are largely applied under load avoided. This allows smaller center and edge distances than conventional ones Expansion anchors are observed. Come with positive anchoring Undercut anchors are used, which are an anchor rod with a down in the setting direction expanding cone and an axially displaceable slid over the anchor rod Have sleeve. At its end facing the cone there is a number of sleeves provided by segments that radially into a when pushing the sleeve onto the cone Undercut of the mounting hole can be created, whereby the positive connection is created becomes.

For the majority of known undercut anchors, the undercut must be made before Setting the anchor can be created. This is done either with a complicated Drilling tool with which the cylindrical receiving bore and the undercut is made. However, such drilling tools are for hard Surfaces not very suitable. Therefore, it is usually initially cylindrical Drill hole made and then in a separate step with a special undercut tool at the desired depth prepared. Only then can the undercut anchor be inserted into the location hole and be anchored. This process of creating positive Anchoring is relatively time consuming and requires special tools such as for example collar drills for producing a location hole with a defined depth, a special undercut device and often an additional device for setting the Undercut anchor.

To facilitate the creation of positive anchors are also Undercut anchors have been proposed that only during the setting process Create undercut. Such a self-tapping undercut anchor is for example, described in US-A-4,702,654. In this well-known The radially extendable segments are designed as cutting flaps for undercut anchors and have cutting edges at their free front ends. To create the The undercut anchor is positively anchored in a cylindrical Location hole inserted. The sleeve rotates on during the setting process pushed on the cone, which is supported on the bottom of the mounting hole. At the rotation of the sleeve, the cutting edges on the radial by the axial feed issued cutting rag in the wall of the cylindrical receiving bore Undercut, the depth of which increases with the degree of flap opening gets bigger. The undercut anchor is at the end of the setting process anchored positively.

A setting tool is used to set the undercut anchor has sleeve-shaped driving part, which over the rear free end of the Anchor rod is inserted into the mounting hole and with rotary drivers is equipped in the correspondingly formed grooves at the rear end of the Insert the sleeve. At the opposite end there is a cylindrical one on the driving part Shaped shaft that is used as an insertion end for the tool holder of a rotary impact drill is trained. The sleeve-shaped jacking part is turned axially by the drill Rotation offsets and transmits the rotary movement to the sleeve. The axial propulsion of the Sleeve takes place through the axial delivered by the drill onto the driving part Blows. The use of this known setting tool requires that the cone the anchor rod is supported on the base of the mounting hole. For this reason, the depth of the mounting hole is precisely controlled. Are for special drilling tools with depth stop, such as collar drills, are required. Another disadvantage is that the cone of the anchor rod when Can dig into the bottom of the location hole. This can cause that the undercut is created too deep in the mounting hole and that the Undercut anchor is undesirably placed deep in the subsurface.

The object of the present invention is therefore to overcome these disadvantages of the setting tools Remedy the state of the art. It is supposed to be a setting tool for self-tapping Undercut anchors are created with which the undercut anchors are independent of the depth of the mounting hole can be anchored in the desired depth are. Bundle drills and similar drilling tools with a depth stop should be avoided can be. In particular, should be self-tapping with the setting tool Undercut anchors can be used, where it is not necessary that they are on Support the base of the location hole. The setting tool should be simple in structure and in Be application and in the tool holders of known rotary impact drills be applicable.

The solution to these tasks is a setting tool for self-tapping Undercut anchor, which in the characterizing section of claim 1 Features listed. The setting tool for self-tapping undercut anchors that form an anchor rod with a Setting direction expanding cone and a rotatable slid over the anchor rod Include sleeve with cutting tab, which by pushing the sleeve onto the cone are radially deployable and an undercut in the wall of a rotation milling cylindrical mounting hole, includes a rotatable driving part for the Sleeve of the undercut anchor and an insertion end molded onto the jacking part for a tool holder of a rotary impact drill. The driving part is involved a support element together, which is supported against the ground and a receptacle for the rear end opposite the cone Has anchor rod in which the anchor rod is axially fixable. The driving part is axially displaceable relative to the support element.

With the setting device according to the invention, self-tapping undercut anchors can be made be placed without the anchor rod at the bottom of the mounting hole must support. The anchor rod is axially in the receptacle of the support element held desired position and prevented from falling into the mounting hole. The support element is supported in the area of the mouth of the receiving bore Underground or on the surface of a connection component. The driving part is with a cylindrical shank connected as the insertion end for the tool holder is formed by known rotary impact drills, and is opposite Support element axially displaceable. In this way, the axial strikes of the rotary impact drill and transfer the rotation of the tool holder to the sleeve the sleeve can be rotated and struck on the cone. The radial flaps cut the undercut into the wall the cylindrical mounting hole. Because it is no longer required that the anchor rod is supported on the base of the mounting hole, this can also be no longer dig in the ground, and the undercut will be in the desired one Depth created.

The setting tool is very simple and essentially only includes that Propulsion part and the support element with receptacle for the anchor rod. The operation of the setting tool does not require any special knowledge and precautions. The The anchor rod with the sleeve pushed on only has to be inserted into the receptacle and there be axially fixed. Then the undercut anchor docked to the setting tool can be in the location hole are inserted. With a rotary impact drill, in the Tool holder the insertion end of the setting tool is inserted, it will Jacking part is set in rotation and axial impacts on the jacking part submitted. This expands the sleeve onto the cone, with the rotating ones Cutting flaps are exhibited radially while milling the undercut. After Only the rotary impact drill from the setting tool needs to end the setting process removed and the support element from the anchor rod of the seated Undercut anchor can be solved. Then the setting tool is ready to place one another self-tapping undercut anchor.

The maximum axial displacement of the propulsion part relative to the support element corresponds to the desired displacement of the sleeve along the anchor rod. At this advantageous embodiment of the invention, the user has a immediate setting control. Only when the jacking part by the full displacement is axially advanced relative to the support element, is the setting process completed and it is guaranteed that the cutting flap is the undercut with the desired undercut depth. Furthermore, through this Feature also ensures that propulsion of the sleeve is limited and the sleeve is not is pushed too far onto the cone. That way you can Overuse of the cutting flaps can be avoided.

For centering the undercut to be created, it is advantageous if that Propulsion part and the support element are aligned with each other such that the Holder for the anchor rod arranged in the axial extension of the insertion end is.

A particularly simple embodiment variant of the receptacle for the anchor rod sees before that it has an internally threaded bore into which the an external thread provided rear end of the anchor rod can be screwed.

For using the setting tool with undercut anchors with anchor rods with different diameters, it is advantageous if the holder for the Anchor rod is designed as an exchange part. This way, recordings can be made with different bore diameters are connected to the support element. In the event that an undercut anchor is to be set, the anchor rod is one Has bore with an internal thread, a receptacle with a corresponding trained pins are provided. The training of recording as Exchange part increases the flexibility of the setting tool.

In an advantageous variant of the invention, the anchor rod is clamped in the Recording held. The anchor rod can be clamped, for example, via a Clamping bolts that run vertically to the anchor rod are made around its axis is rotatable and has a flattened area in the edge area of the receptacle is arranged and in the pivoted state in which the flattened area The center of the recording is turned, the recording is released or in the rotated state, on which the opposite circumferential contour of the clamping bolt protrudes into the receptacle, the anchor rod is fixed by clamping.

To transfer the rotary motion to the sleeve, the driving part can be used Rotary drivers can be equipped, which in correspondingly formed grooves and / or engage projections on the rear end of the sleeve. In a An alternative variant of the setting tool is the propulsion part and the support element non-rotatably coupled. This variant is particularly suitable for self-tapping undercut anchors, where the anchor rod and the sleeve are rotatably coupled together. The rotary coupling of the anchor rod and the sleeve of the undercut anchor as well as the jacking part and the support element of the Setting tool makes rotary drivers on the driving part unnecessary for the sleeve. The rotating propulsion part takes the support element with it. The in the inclusion of the Support element rotatably held in suspension above the bottom of the receiving bore The anchor rod also rotates and transmits the rotary movement to the sleeve.

Fig. 1

ein erstes Ausführungsbeispiel des erfindungsgemässen Setzgeräts im Axialschnitt vor dem Setzen eines selbstschneidenden Hinterschnittankers;

Fig. 2

das Setzgerät aus Fig. 1 mit gesetztem Hinterschnittanker;

Fig. 3

eine auseinandergezogene perspektivische Darstellung eines zweiten Ausführungsbeispiels des Setzgeräts; und

Fig. 4

ein weiteres Ausführungsbeispiel des Setzgeräts in teilweisem Axialschnitt.

The invention is explained in more detail below with reference to exemplary embodiments shown in the figures. In a schematic representation:

Fig. 1

a first embodiment of the setting device according to the invention in axial section before setting a self-tapping undercut anchor;

Fig. 2

the setting tool of Figure 1 with the undercut anchor set.

Fig. 3

an exploded perspective view of a second embodiment of the setting tool; and

Fig. 4

another embodiment of the setting tool in partial axial section.

1 and 2 schematically show an embodiment of the inventive Setting tool in connection with an undercut anchor to be anchored. It poses Fig. 1 shows the state before anchoring and Fig. 2 shows the state at the end of Setting process. The setting device according to the invention is in each case together with the Reference number 1 provided. It comprises a driving part 2, onto which a shaft 3 is molded is that as an insertion end for the tool holder of a not shown Rotary impact drill is formed, for example a hammer drill Applicant. Furthermore, the setting tool 1 comprises a support element 4, which is located on the Supported surface of a component C against the substrate G. One in one cylindrical undercut anchor B to be anchored is complete designated 6 and shown inserted in the receiving bore B. The one shown Undercut anchor 6 is self-tapping and is generated during the setting process an undercut U in the wall of the cylindrical receiving bore B. Der Self-tapping undercut anchor 6 comprises an anchor rod 7 which is attached to its in Setting direction front end with a to the bottom of the mounting hole B expanding cone 8 is provided. A sleeve 9 is pushed over the anchor rod 7 and displaceable in the direction of the axis A of the undercut anchor. The sleeve 9 instructs their front end facing the cone cutting flap 91 with blades that are radially deployable when the sleeve 9 is pushed onto the cone 8. The cutting can be hard metal inserts or pins, for example, or hardened ones Projections, such as welding spots or welded and hardened metal pieces the free ends of the cutting tab 91 may be provided. The sleeve 9 can be in one piece be formed, it can also consist of two sleeve sections, as shown.

The front sleeve section provides the cutting sleeve 93 with the cutting tabs represents, while the adjoining rear sleeve section 92 as a thrust sleeve is formed, the length of which can vary according to the length of the anchor rod 7.

As shown in FIGS. 1 and 2, the anchor rod 7 is in a receptacle 5 in Support element 4 axially fixed. In particular, the axial dimensioning of the for example, setting tool 1 selected such that the anchor rod 7 over the bottom of the mounting hole is kept in suspension. The driving part 2 is axially displaceable relative to the support element 4. Preferably corresponds to the maximum axial displacement of the driving part 2 the desired displacement the sleeve 9 along the anchor rod 7. In the illustrated embodiment the driving part 2 and the support element 4 are rotationally coupled. Axial protrude Projections 21 on the driving part 2 through openings 41 in the sleeve-like Support element 4. When the driving part 2 rotates, the support element 4 turned. The anchor rod 7 is axially fixed in the receptacle 5 in the support element 4 and also rotatably coupled to the support element 4. This makes the Anchor rod 7 with the rotation of the support element 4 and rotates about the axis A. Am Cone 8 radially extending, rib-like rotary drivers 81 are provided, which in the Intervene between the cutting tab 91 and the rotary movement transferred to the sleeve 9, or at least to the cutting sleeve 93.

During the rotation, the percussion mechanism of the rotary-impact drilling machine turns axial Strikes on the driving part 2 given. The jacking part acts as Intermediate striker and transmits the axial blows over at the rear end of the Sleeve 9 or the thrust sleeve 92 abutting axial projections 21 on the Cutting sleeve 93. Due to the axial blows, the driving part 2 is in the setting direction shifted and the sleeve 9 or the cutting sleeve 93 relative to the axially in Float over the bottom of the mounting hole B fixed anchor rod 7 on the Cone 8 pushed on. The cutting flaps 91 are radially issued. By the simultaneous rotation mill the cutting edges on the cutting tabs 91 Undercut U in the wall of the cylindrical receiving bore B. The The setting process is complete when the driving part 2 is moved by the full displacement is shifted relative to the support element 4. This offers the user a Check whether the cutting flaps 91 have been raised to the desired extent and the undercut U has the desired undercut depth. At the end of the setting process, the undercut anchor 6 is positively in the receiving bore B. anchored. The setting tool 1 is released from the anchor rod and is ready for setting another self-tapping undercut anchor.

Fig. 3 shows a second embodiment of the setting tool according to the invention, the is provided overall with the reference number 11. It includes a driving part 12 that an insertion end 13 is formed. The driving part has a sleeve-like, cylindrical section 121 on that with two diametrically opposite Axial slots 122 is provided in the front end face of the section 121 flow out. The axial slots 122 serve to receive a support element 14, which Has the shape of a flat, U-shaped bracket. The length of the axial slots 122 defines the maximum displacement of the feed part 12 fixed. The outside diameter of the cylindrical section 121 corresponds to the outer diameter of the sleeve 9 of the setting undercut anchor 6. The support element 14 is with a receptacle 15 for the anchor rod 7 of the self-tapping undercut anchor 6, which as Incision in the transverse to the longitudinal extent of the setting tool 11 section of the Support element 14 is formed and an internal thread for with a Has externally threaded anchor rod 7. A stop surface 16 at the bottom of the incision supports the rear end of the anchor rod. At the back end the sleeve 9 of the undercut anchor grooves 94 are provided for receiving Protrusions 123 serve from the front end of the cylindrical portion 121 protrude. In the illustrated embodiment, the rotational movement of the Propulsion part 12 transferred directly to the sleeve 9 by the projections 123 on engage cylindrical portion 121 in the grooves 94 of the sleeve 9. The In this case, support element 14 only has the function of axially closing the anchor rod 7 fix. The device shown is thus also suitable for undercut anchors have no rotary drivers for the sleeve 9 on the cone.

Fig. 4 shows a further embodiment of the setting tool according to the invention in partial axial section. The setting tool provided overall with the reference number 31 comprises a support element 34 and an axially displaceable relative to this Propulsion part 32. The propulsion part 32 is connected to a cylindrical shaft 33 which is designed as an insertion end for a rotary impact drill. The driving part 32 and the support element 34 are rotationally coupled. For this purpose, the driving part 32 has on it on the side opposite the shaft 33 axially projecting claws 321 which in Openings 341 protrude in the support element 34. The receptacle 35 for the rear end the anchor rod is formed by an axial bore in the support element 34. A Clamping bolt 36 passes through the bore 35 in the edge area and is rotatable in the Support element 34 mounted. The clamping bolt 36 is connected to a lever 38 which is arranged on the outside of the support element 34. The scope of the Clamping pin 36 has a flattened area 37 which extends into the bore 35 can be swiveled in, the bore 35 being released. By pivoting the Clamping bolt 36, the flattened area is rotated away from the bore 35 and the The diameter of the bore is narrowed. As a result, one is inserted into the bore 35 The anchor rod is axially fixed and non-rotatably connected to the support element 34. By the Anchor rod is fixed by clamping, anchor rods can also without External threads are used in the receptacle 35 to secure them axially and to rotate with the support member 34. The function of this Embodiment of the setting tool according to the invention corresponds to the function of the embodiment described with reference to FIGS. 1 and 2.

The setting tool according to the invention allows self-tapping undercut anchors anchored reliably without first having to define a location hole Depth needs to be created. As a result, the user is informed of the setting depth of the positive anchoring flexible. Special tools, such as drill bits or the like are not required. The anchor rod must move during the setting of the undercut anchor is no longer supported at the base of the location hole and can no longer dig into the ground. The setting tool is simple in construction and also easy to use and in connection with well-known rotary impact drills, For example, the applicant's hammer drills, with which also the cylindrical locating hole is made applicable.

Claims (8)

Setting tool for self-cutting undercut anchors, which comprise an anchor rod (7) with a cone (8) widening in the setting direction and a rotatable sleeve (9) pushed over the anchor rod (7) with cutting tabs (91) ) are radially extendable on the cone (8) and, during rotation, cut an undercut (U) into the wall of a cylindrical receiving bore (B), with a rotatable driving part (2; 12; 32) for the sleeve (9) of the undercut anchor ( 6) and an insertion end (3; 13; 33) formed on the driving part (2; 12; 32) for a tool holder of a rotary impact drill, characterized in that the driving part (2; 12; 32) is provided with a support element (4th ; 14; 34) cooperates, which is supported against the subsurface (G) and has a receptacle (5; 15; 35) for the rear end of the anchor rod (7) opposite the cone (8), in which the anchor rod (7) is axially fixable, wherein the driving part (2; 12; 32) relative to the support element (4; 14; 34) is axially displaceable. Setting tool according to claim 1, characterized in that the maximum axial displacement of the driving part (2; 12; 32) compared to the Support element (4; 14; 34) the desired displacement path of the sleeve (9) along the anchor rod (7). Setting tool according to claim 1 or 2, characterized in that the Propulsion part (2; 12; 32) and the support element (4; 14; 34) to each other are aligned so that the receptacle (5; 15; 35) for the anchor rod (7) in the axial Extension of the insertion end (3; 13; 33) is arranged. Setting tool according to claim 3, characterized in that the Recording (5; 15) for the anchor rod (7) one with an internal thread has provided bore into which the provided with an external thread the rear end of the anchor rod (7) can be screwed in. Setting tool according to claim 4, characterized in that the Recording (5; 15) for the anchor rod is exchangeable. Setting tool according to one of claims 1 to 3, characterized in that a clamping device (36, 37, 38) is provided in the receptacle (35) with which the anchor rod (7) on the support element (34) axially fixable and again is solvable. Setting tool according to one of the preceding claims, characterized characterized in that the driving part (12) with rotary drivers (123) is equipped which in correspondingly formed grooves (94) and / or Engage the projections on the rear end of the sleeve (9). Setting tool according to one of the preceding claims, characterized characterized in that the driving part (2; 12; 32) and the Support element (4; 14; 34) are non-rotatably coupled, wherein preferably that held in the receptacle (5; 35) of the support element (4; 34) Anchor rod (7) and the sleeve (9) of the undercut anchor (6) are non-rotatable are coupled together.

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