Fastening part for hard substrates

Technical field

The invention relates to a fastener for hard surfaces such as concrete, masonry and the like, of the type mentioned in the preamble of claim 1.

State of the art

Such a fastener used to attach to hard surfaces such as concrete, masonry and the like. The fastener is screwed into a previously created hole in the ground by means of an appropriate setting tool, wherein the self-tapping thread creates a complementary thread in the ground or in the borehole. The fastener is anchored on the undercut produced underground. The procedure provided in the receiving load application means, for example, an internal thread, in which for the creation of fastening a fastener such as a threaded rod or a screw can be screwed. Instead of an inner thread may be provided as load application means, a bayonet lock.

From the <patcit id="pcit0001" dnum="EP1536149A2"><text>EP 1536149 A2</text></patcit> is a generic type fastener is known which comprises a cylindrical main body having a first, lying in the setting direction of the fastening element end with a bottom portion and a second, the first end opposite end. On the outside of the base body a self-tapping thread is provided. The base body has inwardly located engagement means for a setting tool and an open second end recording that connects towards the second end of the plea and is provided with an internal thread as load application means. The plea is arranged in an end of the first end on the same axial height of the base body as the outlet of the self-tapping thread.

A disadvantage of the known solution is that the formation of the inner plea connected at the bottom of the receptacle with a substantial manufacturing expenditure and thus is costly. In addition, production possibilities are severely limited in such a fastener. Especially with a mass product, as representing such a fastener, economic production is an important competitive advantage.

From the <patcit id="pcit0002" dnum="US5630688A"><text>US 5,630,688 A</text></patcit> is a generic type, self-tapping bushing for suspended plaster ceilings for performing a suspended lamp Mounting known which comprises a cylindrical main body having a first, lying in the setting direction of the fastening element end and a second, the first end opposite end. On its outside a screw thread is provided. At the first end two cutting elements are formed that create an opening for the grommet in the plaster ceiling in setting the bushing. Between the first and the second end of the body an inner engagement means for a setting tool is provided which simultaneously serves as a feed-through opening. Next, the base body to an open second end of recording, the adjoined toward the first end to the plea.

A disadvantage of the known solution is that in hard surfaces, such as concrete, masonry and the like, no self-drilling through-sleeves can be used. If such a grommet provided with a self-tapping thread for hard surfaces, so the cut at the first end are useless.

Summary of the Invention

Object of the invention is to provide a fastening element for hard constructional that is simple and thus to manufacture economically.

The object is achieved by the features of the independent claim. Advantageous developments are set forth in the dependent claims.

According to the invention is formed as a continuous opening in the bottom portion of the engaging means.

The plea for the setting tool can be created at any time during the production of the novel fastener. Here, the means of attack from the first end or the second end of the body can be formed. Thus, diverse, simple and economical manufacturing process for the preparation of the novel fastener can be used. In addition, the space of the well bore before the fixing element after the setting of the fastener from the outside by the means of attack still accessible and can be, for. Example, be filled with a mortar.

The recording or the load application means advantageously extend from the second end of the body to the plea, so that the entire section to transmit loads is via the fastening means available. In a variant, the load application means for the fastening means in the receptacle extends in a distance from the engaging means and / or the second end.

Preferably, the maximum diameter of the continuous opening 50% to 80% of the core diameter of the base body, whereby a stable configuration of the plea is given for the setting tool to bring even high torques for screwing the inventive fastening element in the hard ground can equal. Among core diameter of the base body is understood measured at the threaded base in this context, the outer diameter of the cylindrical base body without the self-tapping thread or the diameter.

a transition area for guiding of a setting tool is preferably provided between the load engagement means and the bottom portion. The transition region is advantageously designed such that upon insertion of the setting tool of this is diverted for engagement with the engagement means. For example, the transition region is formed dome- or cup-shaped. Alternatively, the transition region z. B. a funnel-shaped configuration on. Because of the transition region a larger attack surface for the setting tool also creates the interference with the plea, which allows the introduction of higher torques than with a fastener without a transition region.

Preferably, the first end of the body has a cone-shaped configuration that allows easy insertion of the inventive fastening element into the hole previously created, and a centering of the fixing element in the borehole. In addition, the tapered configuration provides a larger surface for the setting tool when engaging in the plea, which allows the transfer of high torques.

In an advantageous variant, the inventive fastening element between the load application means and the bottom portion of a transition region, and a first end of the body with a conical configuration.

From the following detailed description and the totality of the claims other advantageous embodiments and feature combinations of the invention follow.

Brief Description of Drawings

The invention is illustrated below with reference to three embodiments. Show it:<dl id="dl0001"><dt>Fig. 1</dt><dd>A longitudinal section through a first embodiment of the inventive fastening element in the set state;</dd><dt>FIG. 2</dt><dd>a longitudinal section through a second embodiment of the inventive fastening element;</dd><dt>Fig. 3</dt><dd>a view of the fastener according to the arrows III-III in Fig. 2; and</dd><dt>Fig. 4</dt><dd>a longitudinal section through a third embodiment of the inventive fastening element.</dd></dl>

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

WAYS OF CARRYING OUT OF THE INVENTION

The illustrated in Figure 1 first embodiment of the fastening element 21 for hard surfaces 11 has a cylindrical base body 22 on the outer side 26 a self-tapping thread 27 is provided. The base body 22 has a first, lying in the setting direction S end 24 with a bottom portion 23 and a second, remote from the first end 24 end of the 25th The base body 22 also has an inner engagement means 28 for a setting tool which is formed as a continuous opening 31 in the bottom portion of the 23rd The maximum diameter E1 of the continuous opening 31 corresponds to about 70% of the core diameter D1 of the base body 22. Next, the base body 22 a to the second end 25 open seat 29, which is provided with an internal thread as load application means 30 and extending toward the second end 25 adjoins the plea 28th

For setting of the fastener 21, a borehole 12 in the hard surface 11 previously -. Here, for example in a concrete component - created and introduced the fastener 21 in this. With a suitable, not shown here, setting tool, which transmits via the engaging means 28 a torque to the fastener 21, the fastener 21 is screwed into the borehole 12, wherein the self-tapping thread 27 creates a complementary thread in the bore hole wall 13 for the generation of an undercut. By continuous opening 31, access to the space 14 is provided in front of the fastening element 21, which can be filled for example with mortar.

The illustrated in Figures 2 and 3 second embodiment of the fastening element 41 for hard surfaces comprises in addition to the described elements of, as shown in the Figure 1 embodiment of the fastener 21 between the serving as load application means 50 internal thread and the bottom portion 43 a dome-shaped transition area 52 to the guide the setting tool on within the fastener 41st The time available for the setting tool contact surface of the plea 48 is compared with the time available for the setting tool contact surface of the plea 28 substantially increased in accordance with the example shown in FIG. 1 Alternatively, the transition region 52, for example, be conical.

As is particularly apparent from Figure 3, which is designed as through opening 51 attack means 48 is designed for the setting tool in the bottom portion 43 for engagement with a Torx-like setting tool. The maximum diameter E2 of the continuous opening 51 corresponds to about 80% of the core diameter D2 of the base body 42nd

The third embodiment illustrated in Figure 4 of the fastening element 61 for hard surfaces comprises a body 62 having a first end 64 that is configured conical. The attack means 68 is formed as a through hole 71 in the bottom portion 63rd The time available for the setting tool contact surface of the plea 68 is compared with the time available for the setting tool contact surface of the plea 28 substantially increased in accordance with the example shown in FIG. 1 The tapered configuration of the first end 64 also facilitates the insertion of the fastening element 61 into a well bore and supports the centering of the fastener 61 during the screwing thereof into the borehole. The maximum diameter E3 of the continuous opening 71 corresponds to about 50% of the core diameter D3 of the base body 62nd