DEVICE FOR SECURING A RUNG IN A CONCRETE WALL

Abstract

A device has two anchor sleeves (3) in a concrete wall (2) accommodating two parallel anchor bolts (6) of a U-shaped step iron (1) form-fittingly. Between coupling parts formed by the anchor sleeves (3) and the anchor bolts (6), a detent assembly (7) has at least one detent tongue (8) sprung in the radial direction on one of the coupling parts (3, 6) and a detent recess (9) that receives the detent tongue (8) on the other coupling part (6, 3). A guide surface (15) for the detent tongue (8) is inclined in the peripheral direction and extends in the radial direction over the engagement depth of the detent tongue (8) adjoining the detent recess (9) at least in a peripheral direction.

Claims

1. A device for fastening a step iron in a concrete wall, having said device comprising: two anchor sleeves being supported in the concrete wall; the step iron being generally U-shaped and having two parallel anchor bolts each form-fittingly accommodated by a respective one of the anchor sleeves, wherein each of the anchor sleeves and the one of the anchor bolts accommodated thereby forming a respective set of coupling parts, and a detent assembly between the coupling parts of one of the sets that includes at least one detent tongue that is sprung in a radial direction and is supported on one of the coupling parts of the set, and structure on the other coupling part of the set defining a detent recess that receives the detent tongue, and wherein a guide surface for engageable with the detent tongue and being inclined in a peripheral direction and extending in the radial direction over an engagement depth of the detent tongue adjoins the detent recess at least in the peripheral direction.

2. A device according to claim 1, wherein the structure defining the detent recess defines a groove extending over a peripheral region of the associated coupling part, wherein said groove terminates at least at one end face by the guide surface.

3. A device according to claim 1, wherein the at least one detent tongue is resilient and is supported on an open spring ring inserted non-rotatably into a peripheral groove of the associated coupling part.

4. A device according to claim 3, wherein the peripheral groove is interrupted by an axial bar that forms an end-face stop for two ends of the open spring ring.

5. A device according to claim 3, wherein the open spring ring has two detent tongues arranged diametrically opposed to one another and each engages in a respective detent recess.

6. A device according to claim 1, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

7. A device according to claim 2, wherein the at least one detent tongue is resilient and is supported on an open spring ring inserted non-rotatably into a peripheral groove of the associated coupling part.

8. A device according to claim 7, wherein the peripheral groove is interrupted by an axial bar that forms an end-face stop for two ends of the open spring ring.

9. A device according to claim 8, wherein the open spring ring has two detent tongues arranged diametrically opposed to one another and each engages in a respective detent recess.

10. A device according to claim 4, wherein the open spring ring has two detent tongues arranged diametrically opposed to one another and each engages in a respective detent recess.

11. A device according to claim 7, wherein the open spring ring has two detent tongues arranged diametrically opposed to one another and each engages in a respective detent recess.

12. A device according to claim 2, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

13. A device according to claim 3, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

14. A device according to claim 4, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

15. A device according to claim 5, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

16. A device according to claim 7, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

17. A device according to claim 8, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

18. A device according to claim 9, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

19. A device according to claim 10, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

20. A device according to claim 11, wherein the detent tongue is associated with the anchor bolt, and the detent recess is associated with the anchor sleeve.

Description

BRIEF DESCRIPTION OF THE INVENTION

[0010] The subject matter of the invention is depicted by way of example in the drawings, in which

[0011] FIG. 1 shows a step iron fastened in a concrete wall with the aid of a device according to the invention in a section through the anchor sleeves,

[0012] FIG. 2 shows an anchor sleeve with inserted anchor bolt in an axial section on a larger scale, and

[0013] FIG. 3 shows a section along line III-III of FIG. 2.

EMBODIMENT OF THE INVENTION

[0014] As is clear from FIG. 1, two anchor sleeves 3 are moulded for each step iron 1, into which sleeves the step iron 1 is inserted, for subsequent fastening of a step iron 1 in a concrete wall 2, for example of a shaft ring. The U-shaped step iron 1, which forms a tread bar 4 having two protruding limbs 5, has two parallel anchor bolts 6 at the limb ends for anchoring into the anchor sleeves 3. This anchoring is achieved via a detent assembly 7 between the anchor sleeve 3 and the anchor bolt 6 engaging in the anchor sleeve 3. The detent assembly 7, in accordance with FIGS. 2 and 3, comprises two sprung detent tongues 8, which are diametrically opposed to one another and latch in sprung fashion into detent recesses. Although the detent tongues 8 are preferably associated with the anchor bolts 6 and the detent recesses 9 are preferably associated with the anchor sleeves 3, this is not mandatory, because in a kinematic reversal the detent tongues 8 and the detent recesses 9 may also belong to the other one of these coupling parts respectively.

[0015] In order to create simple construction preconditions, the detent tongues 8 are provided on an open spring ring 10 that is separate from the anchor bolts 6 and is inserted into a peripheral groove 12 of the anchor bolt 6, the peripheral groove being interrupted by an axial web 11, and is supported by its end-face ends 13 on the axial web 11 so as to be prevented from rotating in the peripheral direction. The detent recesses 9 for the detent tongues 8 are formed by grooves 14 extending over a limited peripheral region of the coupling sleeve 3, the grooves being adjoined at an end face by a guide surface 15, inclined in the peripheral direction, for the detent tongue 8. Since the incline of the guide surface 15 extends over the groove depth, as the anchor bolt 6 is rotated in the direction of the incline of the guide surfaces 15, the detent tongues 8 are pivoted against their spring force along the guide surfaces 15 out of the grooves 14 radially inwardly relative to the spring ring 10, such that the anchor bolts 6 can then be pulled from the anchor sleeves 3 when the detent assembly 7 is released. For this purpose, however, the tread bar 4 must have been severed beforehand, so that the anchor bolts 6 can be rotated by the remaining tread bar portion in the anchor sleeve 3.

[0016] To insert a step iron 1 into the anchor sleeves 3, the anchor bolts 6 with the spring rings 10 inserted non-rotatably merely have to be inserted into the anchor bolts 6 until the detent tongues 8 pivoted in relative to the anchor bolts at the time of insertion latch in sprung fashion into the detent recesses 9 and the anchor bolts 6 thus lock in the anchor sleeves 3 in a manner secured against an axial removal.