DE3419968A1 - Expanding dowel - Google Patents

Abstract

The invention relates to an expanding dowel for anchorage in drilled holes which are preferably produced such that they expand conically inwards. The expanding dowel consists of an expanding part (1) which is supported on the base of the drilled hole and has an expanding cone (2), onto whose expanding cone an expanding sleeve (4) can be driven and onto whose end opposite the expanding cone means for the attachment or suspension of objects are arranged. In order to simplify the production process, the expanding part (1) is stamped from steel plate and the expanding cone (2) is rolled from a corresponding developed projection, and the roll gap (6) in the envelope surface of the expanding cone is finally calibrated. <IMAGE>

Description

Expansion anchor

The invention relates to an expansion dowel for anchoring in preferably Boreholes made conically widened inwards, consisting of one at the bottom of the borehole supporting, an expansion cone having expansion part, on the expansion cone an expansion sleeve can be inflated and on its opposite to the expansion cone End means for attaching or attaching objects are arranged.

Expansion dowels of the above type are used in particular in ceilings, because by driving the expansion sleeve onto the expansion cone seated on the bottom of the borehole the expansion part is anchored insensitive to cracks. The one attached to the expansion part Load takes care of an expansion of the borehole due to a through the borehole running crack for post-expansion, which reduces the loss of holding value due to the opening hole compensates, but at least significantly reduced.

On the one hand, to reduce the impact energy when pushing open the expansion sleeve to reduce and on the other hand to increase the expansion capacity, it is with this one Kind of expansion dowels advantageous, the borehole with a down to the bottom of the borehole to provide widening undercut. With known expansion anchors this Art is usually a stud bolt with upset expansion cone as an expansion part used. The thread of the stud bolt is used to fasten objects or For screwing adapter parts onto objects using wires, perforated strips or Like. Can be attached. The manufacture of the stud bolts and in particular the Adapter parts is very costly and in terms of such SpreizdiJbeln Desired low anchoring depth overdimensioned solely due to the manufacturing process.

The invention is therefore based on the object of the expansion dowel to design, da05 a simple and inexpensive production is possible.

According to the invention this is achieved in that the expanding part Sheet steel punched, as well as the expansion cone rolled from a corresponding development and the rolling gap in the lateral surface of the expansion cone is calibrated to close.

A sheet steel can now be used for the production of the expansion part be, the expansion part both with the settlement for the expansion cone as well already with the appropriate means for attaching or hanging objects is punched out. The expansion cone is then rolled and additionally checked for shape accuracy on the one hand and on the complete closure of the gap in the outer surface of the expansion cone on the other hand calibrated. Closing the gap gives the expansion cone a stability that a deformation of the expansion cone when driving the expansion sleeve excludes. The spreading conditions are therefore identical to those of one out of one Solid material of hammered expansion cone. On the expansion cone with the agent for attaching objects connecting web of the expansion part is laterally the also rolled and thus having a continuous longitudinal slot having expansion sleeve put inside. For anchoring, the expansion anchor according to the invention is now inserted into the prepared The borehole is inserted until the expansion cone rests on the bottom of the borehole. After that, hits on the face of the expansion sleeve by means of an over the attachment strap of the sliding impact tool, the expansion sleeve on the expansion cone distended.

Objects such as cables, pipes, Ceilings and the like. Attached or attached.

In a further embodiment of the invention, the Expansion cone adjoining section of the expansion part has a longitudinal profile notch exhibit. With this profile notch a stiffening of the one located in the expansion sleeve Section of the expansion part reached.

Finally, in a further addition to the invention, directly connect a constriction of the expansion part to the expansion cone. In this narrowing of the expanding part web, the expanding lamellae of the expanding sleeve are bent. In order to there is a run-up bevel for the expansion sleeve, which prevents the expansion sleeve from snagging prevented when driving in the expansion anchor and thus facilitates the hammering. As soon as the expansion cone is seated on the bottom of the borehole, a slightly stronger one is used Impact the constriction that serves as a lock for the face of the expansion sleeve overcome and the expansion lamellae driven onto the expansion cone.

An exemplary embodiment of the invention is shown in the drawing.

The figures show: FIG. 1 the expansion anchor inserted in the borehole. FIG 2 the anchored expansion dowel Figure 3 the attachment of an object to the Expansion anchor The expansion anchor consists of the expansion part 1 with a conical expansion cone 2 and over part of its length with longitudinal slots 3 and from one Sheet metal rolled expansion sleeve 4. The expansion part 1 is also made of sheet steel the settlement for the expansion cone 2 and with a hanging strap 5 as a means for Attaching or attaching items punched. To form the expansion cone 2 the corresponding development on the expansion part is rolled so that the expansion cone arises. The form accuracy of the expansion cone is determined by calibrating in a form 2 on the one hand and the complete closure of the roller locker 6th on the other hand achieved. For pushing the expansion sleeve 4 onto the expansion part section between expansion cone 2 and attachment bracket 5, the expansion sleeve 4 is continuous at its Longitudinal slot 7 bent open until it can be slipped over the expansion part section is. After the expansion sleeve springs back, a captive connection is created between expansion sleeve and expansion part. If necessary, compressing the Sleeve necessary, at the same time the spreading lamellae 8 in the in the spreading part 1 provided constriction 9 are bent.

This creates a bevel that prevents the expansion sleeve from snagging 4 prevented when driving.

To anchor the expansion anchor, a with one of the suspension lugs 5 adapted incision 10 provided impact tool 11 used with the is struck on the face of the expansion sleeve 4. By bumping into the opposite The end face of the expansion sleeve at the constriction limitation 9 'becomes the expansion part 1 pushed into the borehole 12 until the expansion cone 2 rests on the bottom of the borehole.

After overcoming the constriction 9 'by something The expanding lamellae 8 in the gap between the outer surface are stronger of the expansion cone and the wall of the undercut 13 of the borehole 12 and thus the expansion plug anchored in the borehole.

The serves as a means for attaching or attaching objects Attachment lug 5 of the expansion part 1. Depending on the design of the attachment lug 5 can hooked onto these wire or perforated strips 14 or

be fastened by means of a fastening screw 15. For stiffening of the expansion part 1 is a longitudinal one between the expansion cone 2 and the attachment bracket 5 Profile notch 16 arranged.

Claims (3)

PATENT APPROACH 1. Expansion anchor for anchoring in preferably Boreholes made conically widened inwards, consisting of one at the bottom of the borehole supporting, an expansion cone having expansion part, on the expansion cone an expansion sleeve can be inflated and on its opposite to the expansion cone End means for attaching or attaching objects are arranged thereby characterized in that the expansion part (1) is punched from sheet steel, as well as the expansion cone (2) rolled out of a corresponding development and the rolling gap (6) in the lateral surface of the expansion cone is then calibrated. 2. Expansion dowel according to claim 1, characterized in that the to the expansion cone (2) adjoining section of the expansion part (1) a longitudinal one Profile notch (16). 3. Expansion dowel according to claim 1, characterized in that directly a constriction (9) of the expansion part (1) adjoins the expansion cone (2), in which the expanding lamellae (8) of the expanding sleeve (4) are bent.