DE4028766A1 - Installation unit insert with base for spreading claws and screws - has holder with circular border below screw head and claw with operating shank in form of fork - Google Patents

Abstract

The edge (11) for the holder is arranged under the screw head (9) of the spreading screw (4). The spreading claw (3) is designed as a fork, which is led through a passage opening (7) of the unit insert (1), lies with one part of its fork (13) on the edge (11), whilst the fork ends support themselves under the screw head. The claws are protected against sliding out from the passage opening (7) by lateral undercuttings (6) at their fork (13) which corresp. to projections (8) at the passage opening. USE/ADVANTAGE - Installation unit insert improved so that installation of spreading claw is made easier.

Description

The invention relates to an installation device insert according to the preamble of claim 1.

With installation devices of the generic type it is usual, a rubber for holding the expanding claws provide ring that ge over the two spreading claws is and holds them together. By this arrangement becomes a hindrance when inserting the device in avoided the installation box. Since the rubber ring from This procedure is extremely manual uneconomical.

In order to reduce this effort, one therefore has to a proposal in DE 38 23 117 A1 to the spread clawed leaf spring legs attached when tightening the spreading screws cause the claws to spread while turning back the expansion screws due to the leaf spring restoring force the claws one receive corresponding spread provision. This out The spreading claws should not only be used when current situation on the installation device insert, but also in every intermediate position up to which the spreading claws have been moved by the expansion screws.  

This known prior art with metal leaf spring on the spreading claws is relatively simple but still a lot of manufacturing effort afford to.

The invention is therefore based on the object Spreading claw holder of the generic type continue to simplify.

This task is based on the above Species of installation equipment that characterize solved the features of claim 1. Another advantage stick embodiment of the invention is in a Unteran saying given.

The drawings show an embodiment in four figures example of the invention. It shows

Fig. 1 in an enlarged scale a side of an insert installation devices with the Einspreizkralle and its holder by means of the special Einspreizschraube,

Fig. 2 is a plan view of the arrangement according to FIG. 1,

Fig. 3 is a view in the direction of arrow "A" to the arrangement of FIG. 1,

Fig. 4 is a view of the spreading screw used.

The fragmentary device insert 1 according to FIGS. 1 to 3 has a base 2 , in which an expansion screw 4 is screwed out. The operating leg 5 of an expanding claw 3 is designed as a fork 13 and projects through a push-through opening 7 on the device insert 1 . A special expanding screw 4 is provided for holding the expanding claw 3 . It is formed below its screw head 9 at a distance from the screw thread 12 with a thread-free shaft section 10 and has a smaller diameter than the screw thread 12 . To screw thread 12 it is equipped with a peripheral edge 11 and serves the fork 13 of the operating leg 5 as a support, while the fork ends are supported below the screw head 9 of the expansion screw 4 . This obliquely supported fork end of the operating leg 5 creates a mounting effect or restoring moment for the expanding claw 3 , which holds it in the non-spread position on the device insert 1 . With this arrangement, the expansion screw is secured against unintentional unscrewing.

So that the spreading claw is also secured against slipping out of the push-through opening 7 of the device insert 1 , the fork 13 has undercuts 6 on its two sides. The push-through opening 7 is provided with projections 8 . When inserting the operating leg 5 through the push-through opening 7 , the projections 8 are designed ela stically enough to allow the fork ends to pass, so that afterwards their undercuts 6 correspond to the projections 8 of the push-through opening.

Reference symbol list

1 device insert
2 bases of 1
3 spreading claw
4 expansion screw
5 operating legs of 4
6 undercuts of 5
7 push-through opening of 1
8 tabs out of 7
9 screw head of 4
10 thread-free shaft section of 4
11 surrounding edge of 4
12 screw threads of 4
13 fork of 5

Claims (3)

1. Installation device insert, consisting of a base with expanding claws and expansion screws for fastening the device insert in an installation box, and with a holder for holding the expanding claws on the device insert in the non-ge spread position, characterized in that a circumferential edge for the holder ( 11 ) beneath the screw head ( 9 ) of the expansion screw ( 4 ) is easily seen, and that the expansion claw ( 3 ) has an operating leg ( 5 ), which is configured as a fork ( 13 ), through a push-through opening ( 7 ) of the device insert ( 1 ) is guided and with part of its fork ( 13 ) on the edge ( 11 ), while the fork ends are supported below the screw head ( 9 ). 2. Installation device insert according to claim 1, characterized in that the expanding claw ( 3 ) by side undercuts ( 6 ) on its fork ( 13 ), which correspond to projections ( 8 ) on the push-through opening ( 7 ) of the device insert ( 1 ), against out slipping out of the push-through opening ( 7 ) are secured. 3. Installation device insert according to claim 1 and 2, characterized in that the expansion screw ( 4 ) below its screw head ( 9 ) up to the circumferential edge ( 11 ) has a thread-free shaft portion ( 10 ) which is smaller in diameter than the screw thread ( 12 ) is.