EP2191938A2 - Setting tool for an insulation dowel - Google Patents

Abstract

The setting tool (21) has a groove (44) for guiding a locking element (57), which is attached at a recess (43). The locking element is helically extended along an extent toward an end (27) of a drive shaft (22). The locking element is extended on the basis of the recess in an area wise manner.

Description

The invention relates to a setting tool for an anchored with a fastener in the ground insulation anchors, referred to in the preamble of claim 1. Art.

For the attachment of insulation boards so-called insulation dowels are used, which have a shaft with an anchoring portion at one end and a plate-shaped, other end. Through the insulation plate through a hole is created in the ground. Subsequently, the insulating dowel is introduced with its anchoring portion having the end ahead in the bore and anchored with a fastener, such as a spreader, underground. In the set state of the insulation plug, the plate-shaped end is located on the surface of the insulation board or this is sunk in the insulation board.

From the DE 10 2007 000 235 A1 is a setting tool for an anchored with a fastener in the ground insulation dowel known, which has an insulating thread instead of a pressure plate, which penetrates into the insulation material when setting the insulation dowel. The setting tool has a first drive shaft. which has a shaft extending along a longitudinal axis, having a first fastener rotational drive means at a first end, and a second rotational driver means for a setting tool at a second end opposite the first end. Furthermore, the setting tool has a coaxial with the first drive shaft arranged second drive shaft, which has a hollow shaft with a third rotational drive means for the insulating dowel at a first end. In addition, a detachable by axial pressure coupling is provided, which is arranged at a portion spaced from the first end of the second drive shaft and at least one locking element which engages for transmitting a torque from the first drive shaft to the second drive shaft in at least one recess.

When setting the insulation dowel comes the free, the insulating material facing the end of the second drive shaft, which is provided here with an axially adjustable stop plate, with the insulation in investment, coupled in a further advance of the setting tool in the setting direction, the clutch and the transmission of the torque of the first drive shaft to the second drive shaft is interrupted. As a result, only the first drive shaft is driven by the setting tool until the insulation anchor is anchored in the ground via the fastening means. After completion of the setting operation by the user, the first drive shaft is displaced relative to the second drive shaft until the clutch for a retransmission of the torque from the first drive shaft to the second drive shaft engages, whereby the setting tool for a renewed setting operation again. About the axially adjustable stop plate insulating dowels can be different deep z. B. be set in relation to the thickness of the insulating material.

This setting tool is characterized in particular by its ease of use and the high flexibility in terms of the settability of different Dämmstoffverübelgrössen and setting depths.

The object of the invention is to provide a setting tool for an anchored with a fastener in the ground insulation dowel, which is even easier to use and in particular simplifies the engagement of the triggered clutch.

The object is solved by the features of the independent claim. Advantageous developments are set forth in the subclaims.

According to the invention, a groove for guiding the at least one blocking element is provided, which adjoins the at least one recess and extending from the at least one recess at least partially along the circumference helically in the direction of the second end of the first drive shaft.

The groove for guiding the at least one blocking element thus extends, starting from the recess, axially in the direction of the second end of the first drive shaft and at the same time at least partially along the circumference of the first drive shaft.

Advantageously, the recess has a greater depth to the surface of the corresponding part of the setting tool on which it is arranged than the groove adjoining the recess. However, this is not a mandatory requirement, whereby the recess and the groove adjoining this recess are each the same Can have depth. Essential for the function of the recess is that the blocking element is held to transmit torque from the first to the second drive shaft until it reaches a defined release torque of the clutch therein

As soon as a third rotary driving means facing end portion of the second drive shaft of the setting tool abuts the surface of the insulation board, in the setting tool according to the invention in a further feed of the same in setting direction such a large pressure on the clutch is generated that the at least one blocking element with the recess except Engaging comes and then slides along the shaft of the first drive shaft. The coupling between the first and the second drive shaft is now in the disengaged state. As a result, the torque transmission from the first to the second drive shaft and thus to the insulation dowel is interrupted. This is done without any action by the user in one step with always the same, z. B. due to the previously determined with an axially positioned stop plate setting depth of the insulation dowel. The first drive shaft of the setting tool is further rotationally driven to operate the fastener and thus to anchor the insulation anchor in the ground.

After completion of the setting operation, the first drive shaft is offset relative to the second drive shaft, wherein the at least one blocking element with the helically extending groove engages the locking element and is guided by this until it penetrates into the recess thereof. Once the at least one locking element engages again in the recess, the coupling between the first and the second drive shaft is engaged again, whereby again a torque from the first to the second drive shaft is transferable and the setting tool is available for a renewed setting process.

The setting tool is thereby even easier to handle, since for a renewed setting process, the drive shafts do not have to be manually rotated to each other to ensure engagement of the triggered clutch. During the axial displacement of the drive shafts to each other, d. H. when pulling them apart, the coupling is largely automatic.

The insulating dowel has, for example, a spreading area which can be widened by an expansion screw as a fastening means. On the shaft or on advantageously helical pressure plate, which forms an insulation thread, a rotational drive is provided, for. B. a recording in which the third rotary driving means, for. B. a matched to the recording outer polygon, at the first end of the second drive shaft for transmitting the torque from the second drive shaft engages the insulation dowel.

The first rotational drive means for the fastener at the first end of the first drive shaft is, for example, a trained on the rotational drive of the fastener screwdriver bit or a receptacle for a polygonal bit having at the free end with the rotational drive of the fastener engageable, free end.

The second rotational drive means for the fastener at the second end of the first drive shaft, for example, a spigot, which in the tool holder of the setting tool, such as. As a screwdriver or a drill, can be inserted.

At the second end of the first drive shaft also advantageously an additional coupling is provided, which ensures an axial feed force to the setting tool at the beginning of the setting process. By manual pressure in the setting direction of the insulation plug, the additional coupling couples for torque transmission from the setting tool on the first drive shaft. As a result, at the beginning of the setting process, the insulating dowel is easily pushed into the borehole. By the previous insertion of the insulation plug is aligned with respect to the orientation of the borehole and the subsequent correct setting process, especially for less experienced users, significantly facilitated. Due to the rotational decoupling on account of the additional coupling, the user can lead an insulation dowel plugged onto the setting tool into the borehole while the setting tool device is already performing a rotary movement.

Preferably, a plurality of locking elements and corresponding to the number of locking elements, a plurality of recesses are provided, extending from each recess each having a groove. The number of recesses thus agrees advantageously with the number of locking elements. Advantageously, the recesses and thus the locking elements are circumferentially arranged evenly distributed. For example, three blocking elements these and the corresponding recesses are each provided offset by 120 ° to each other.

Preferably, the at least one recess and the adjoining groove on the shaft of the first drive shaft are provided, which allows a simple training of the same. The at least one recess and the adjoining groove become for example, with a cutting process on the appropriate part of the setting tool, such. B. formed on the shaft of the first drive shaft.

Preferably, the groove is provided along the circumference such that the end of the groove facing away from the recess extends over an axial projection of a recess, whereby an overlapping of the groove is provided at least with a region of the recess. Thus, regardless of the position of the first drive shaft to the second drive shaft, guidance of the at least one blocking element in the groove is advantageously ensured, when the drive shafts are offset relative to one another. It is ensured that the at least one blocking element comes to lie in a transition region before engaging in the recess in the groove and is guided by this. Because with this solution it is avoided that in the extended state of the first and second drive shaft, the at least one locking element comes to lie outside a recess and thus the coupling between the first and second drive shaft is not engaged.

If a plurality of recesses are provided, each with a groove adjoining thereto, and if these are advantageously distributed uniformly circumferentially, then the helically extending grooves advantageously extend over the angular range resulting from the number of grooves provided and the distribution. If the recesses are distributed unevenly around the circumference, the helical grooves adjoining the recesses advantageously also extend over different angular ranges.

Preferably, the depth of the groove decreases starting from the recess in the direction of the recess facing away from the recess end of the groove, whereby the degree of leadership of the locking elements in the groove increases in the direction of the recess, followed by the corresponding groove. If a plurality of recesses and thus a plurality of grooves provided, advantageously all the grooves have the same configuration with respect to their depth, whereby a simple engagement of the clutch is ensured. If several grooves provided, these z. B. also have different depths, which in particular ensures an advantageous Einkupplungsverhalten the clutch when the recesses are arranged circumferentially uneven.

Preferably, the width of the groove decreases starting from the recess in the direction of the recess facing away from the recess end of the groove, whereby the degree of guidance of the locking elements in the groove increases in the direction of the recess, followed by the corresponding groove. Are several recesses and thus several grooves provided, all the grooves advantageously have the same configuration with respect to their width, whereby a simple engagement of the clutch is ensured. If several grooves provided, these z. B. also have different widths, which in particular ensures an advantageous Einkupplungsverhalten the clutch when the recesses are arranged circumferentially uneven.

Preferably, the groove is trapezoidal or trough-shaped in cross section, which ensures an advantageous guidance of the at least one blocking element and a simple formation of the groove. In addition, no or only slight notch stresses are generated under load in the material of the corresponding part of the setting tool.

Fig. 1

Ein Setzwerkzeug im Längsschnitt;

Fig. 2

einen Schnitt entlang Linie II-II in Fig. 1;

Fig. 3

eine Detailansicht auf einen Schaftabschnitt der ersten Antriebswelle; und

Fig. 4 A-C

der Setzvorgang mit dem erfindungsgemässen Setzwerkzeugs in drei Montagezuständen.

The invention will be explained in more detail below with reference to an embodiment. Show it:

Fig. 1

A setting tool in longitudinal section;

Fig. 2

a section along line II-II in Fig. 1 ;

Fig. 3

a detailed view of a shaft portion of the first drive shaft; and

Fig. 4 AC

the setting process with the inventive setting tool in three assembly states.

Basically, the same parts are provided with the same reference numerals in the figures.

That in the FIGS. 1 to 3 respectively. Figures 4 AC shown setting tool 21 for anchoring with an expansion screw as a fastener 16 in the ground 6 insulation dowel 11 has a first drive shaft 22 and a second drive shaft 32.

The first drive shaft 22 has a shaft 23 extending along a longitudinal axis 31 with a screwdriver bit receptacle as the first rotational drive means 24 for the fastening means 16 at a first end 25 and with a plug-in end as the second rotary drive means 26 for an electric screwdriver as a setting tool device 8 at a second, the first End 25 opposite end 27 on. At the second end 27, an additional clutch 28 is provided.

The additional coupling 28 comprises a pot-shaped portion 51, which is coaxially guided over the second end 27 of the first drive shaft 22. At the first drive shaft 22 are provided radially projecting from this driving cam 29, which with Cams 53 at the free end of the cup-shaped portion 51 are engageable. Between the pot-shaped portion 51 and a portion of the second end 27, a spring element 52 is provided, for. B. a coil spring which holds the additional clutch 28 in a disengaged position.

The way to anchor the fastener can be defined by a stop on the first drive shaft 22 fixed, which abuts an area at the second end 37 of the second drive shaft 32. For example, this stop is formed by the radially projecting drive cam 29 on the first drive shaft 22, which come into contact with the second end 27 of the first drive shaft 22 facing side of the housing 58 of the clutch 38 and thus a further displacement of the first drive shaft 22 relative to prevent the second drive shaft 32 in the setting direction. This ensures a uniform, defined anchoring of the insulating anchor 11 by the fastening element 16.

The second drive shaft 32 is arranged coaxially with the first drive shaft 22 and has a hollow shaft 33 with an outer polygon as the third rotational drive means 34 for the insulating dowel 11 at a first end 35. At an area spaced from the first end 35 of the second drive shaft 32, which corresponds to the second end 37 of the second drive shaft 32 in this embodiment, an axially releasable coupling 38 is provided.

The coupling 38 comprises three locking elements 57 in the form of balls, which engage in the transmission of torque from the first drive shaft 22 to the second drive shaft 32 in three recesses 43 which circumferentially uniformly, d. H. are arranged at a radial distance of 120 ° to each other. Following each of the recesses 43, a groove 44 for guiding the blocking elements 57 is provided, which directly adjoin the recess and extend from the recesses 43 in regions along the circumference helically in the direction of the second end 27 of the first drive shaft 22. The recesses 43 and the adjoining grooves 44 are provided on the shaft 23 of the first drive shaft 22.

The grooves 44 are provided along the circumference of the first drive shaft 22 such that the end 45 of the groove 45 facing away from the corresponding recess 43 extends over an axial projection of an adjacent recess 44. The grooves 45 extend in this example substantially over an angular range of about 120 °. In the FIG. 3 this overlap of the grooves 44 with the axial projection of an adjacent recess 44 is designated by U.

The depth and width of the grooves 44 decreases starting from the recess 43 in the direction of the recess 43 facing away from the end 45 of the groove 44 from. Instead of the illustrated trough-shaped configuration of the cross section of the grooves 44 whose cross-section may also be formed trapezoidal. The depth of the recesses 43 is greater than the maximum depth of the grooves 44 is formed.

The coupling 38 is surrounded by a housing 58 which projects beyond the radial projection of the second drive shaft 32. In the housing 58, a spring element 59 is provided, for. Example, a coil spring which spring-loaded a clamping ring 56 in the direction of the first end 25 of the first drive shaft 22. The clamping ring 56 forces the locking elements 57 in the direction of the first drive shaft 22, whereby the clutch 38 is held in a coupled state.

Further, a relative to the longitudinal axis 31 axially displaceably mounted stop plates 41 is provided on the second drive shaft 32, the axial distance to the first end 35 of the second drive shaft 32 via a positioning device 46 can be preset. The positioning device 46 comprises a plurality of spacer elements 47, which are arranged axially between the stop plate 41 and a stop 60 on the second drive shaft 32. The stopper 60 is formed by a radial projection of the second drive shaft 32 projecting portion of the housing 58 of the coupling 38 between the first drive shaft 22 and the second drive shaft 32.

The spacer elements 48 are substantially hollow-cylindrical and, for a simple arrangement on the second drive shaft 32, each have a longitudinal slot which extends over the entire axial length of the spacer element 48. These spacers 48 are simply plugged onto the second drive shaft 32 if necessary. These are advantageously made of a radially elastic material, which allows a simple clipping for mounting the spacer elements 48 on the second drive shaft 32.

Alternatively, the spacer elements 48 are hollow cylindrical and circumferentially closed. Such spacer elements 48 are pushed to adjust the setting depth of the insulation plug 11 via the first end 35 of the second drive shaft 32 on the shaft 33, if necessary.

The following is based on the Figures 4 AC set the setting process of an insulating anchor 11 with the inventive setting tool 21.

The insulating anchor 11 is provided with the expansion screw as a fastening means 16 and is placed as a whole on the setting tool 21 and then inserted into the previously created by the to be fastened insulation board 7 into the ground 6 hole 9 (see Fig. 3A ). Alternatively, first the insulating dowel 11 is inserted with the expansion screw into the wellbore 9 and then the setting tool 21 is coupled to the insulating dowel 11. The insulating dowel 11 has at one end a helical pressure plate 12 and an insulating thread and a receptacle as a rotary drive 13, which with the third rotary driving means 34 at the first end 35 of the second drive shaft 32 for transmitting the torque from the second drive shaft 32 on the insulating dowel 11 in Intervention can be brought. Previously, the stop plate 41 has been displaced axially along the second drive shaft 32 by means of the positioning device 46 in order to set the desired setting depth of the insulating dowel 11.

By pressure in the direction S of the insulation plug 11, the second end 27 of the first drive shaft 22 arranged additional clutch 28 is engaged, so that the torque generated by the setting tool 8 on the first drive shaft 22 and from there via the clutch 38 to the second drive shaft 32nd is transmitted.

Once the desired setting depth of the insulating anchor 11 is reached (see Fig. 4B ), the stop plate 41 abuts against the surface 10 of the insulating plate 7. In a further feed of the setting tool 21 in the setting direction S, the pressure on the clutch 38 between the second drive shaft 32 and the first drive shaft 22 so that it triggers and a transmission of torque from the first drive shaft 22 to the second drive shaft 32 and thus on the insulation plug 11 interrupts. The first drive shaft 22 is further driven in rotation, so that the fastening means 16 can be driven further to widen the anchoring region 14 of the insulating anchor 11.

The third rotational driving means 34 on the second drive shaft 32 advantageously has a conical design, so that when setting the insulating anchor 11, a frictional engagement or a clamping between the third rotary driving means 34 and the rotational drive 13 of the insulating anchor 11 takes place. Due to the easily releasable holding force between the setting tool 21 and the insulating dowel 11, the second drive shaft 32 is automatically brought into the front, engaged initial position when the setting tool 21 is pulled out after completion of the setting process (see Fig. 4C ).

When the blocking elements 57 come to rest in the region of the grooves 44, the blocking elements 57 are guided by them until they engage in the corresponding recess 43. Now, the setting tool 21 is available for a renewed setting process of a further insulating dowel 11, which is set exactly and correctly deep as the previously set insulation dowel 11.

If, in a setting process, no clamping between the setting tool 21 and the insulation plug 11 occurs exceptionally, then the second drive shaft 32 can be manually pushed forward again in the direction of the first end 25 of the first drive shaft 22 until the coupling 38 engages the first drive shaft 22 and the second drive shaft 32 again rotatably coupled with each other.

Claims (7)

Setting tool (21) for a with a fastening means (16) in the substrate (6) anchored insulation dowels (11), with
a first drive shaft (22) having a shaft (23) extending along a longitudinal axis (31) with a first rotational engaging means (24) for the fastening means (16) at a first end (25) and with a second rotary driving means (26) for a setting tool device (8) at a second, the first end (25) opposite end (27), and with
a coaxial with the first drive shaft (22) arranged second drive shaft (32) having a hollow shaft (33) with a third rotational drive means (34) for the insulating dowel (11) at a first end (35), and
with an axially releasable coupling (38) disposed at a portion spaced from the first end (25) of the second drive shaft (32) and including at least one locking member (57) adapted to transmit torque from the first drive shaft (38). 22) engages the second drive shaft (32) in at least one recess (43), characterized in that
a groove (44) is provided for guiding the at least one blocking element (57), which adjoins the at least one recess (43) and, starting from the at least one recess (43) at least partially along the circumference, helically in the direction of the second end (27) of the first drive shaft (22). Setting tool according to claim 1, characterized in that a plurality of locking elements (57) and corresponding to the number of locking elements (57), a plurality of recesses (43) are provided, starting from each recess (43) each having a groove (44). Setting tool according to claim 1 or 2, characterized in that the at least one recess (43) and the adjoining groove (44) on the shaft (23) of the first drive shaft (22) are provided. Setting tool according to one of claims 1 to 3, characterized in that the groove (44) is provided along the circumference such that the recess (43) facing away from the end (45) of the groove (44) via an axial projection of a recess (43 ). Setting tool according to one of claims 1 to 4, characterized in that the depth of the groove (44), starting from the recess (43) in the direction of the recess (43) facing away from the end (45) of the groove (44) decreases. Setting tool according to one of claims 1 to 5, characterized in that the width of the groove (44), starting from the recess (43) in the direction of the recess (43) facing away from the end (45) of the groove (44) decreases. Setting tool according to one of claims 1 to 6, characterized in that the groove (44) is trapezoidal in cross-section.

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