Expansion dowel for spaced mounting of parts on a support structure

Claim 1

Expansion dowel assembly for insertion into a bore hole in a support structure for supporting a part in spaced relation from the support structure, comprising an axially elongated sleeve-like expansion member arranged to be inserted into a bore hole and having a front end inserted first into the bore hole and a rear end, said sleeve-like expansion member having a first axially extending portion extending from the front end thereof for a part of the axial length thereof, said first portion arranged to be inserted into and expanded into holding contact with the surface of the bore hole, and a second axially extending portion extending from the rear end of said expansion member for a part of the axial length thereof toward said first portion and arranged to project outwardly from the bore hole, means for expanding said first portion, a stop member secured on said second portion and movably adjustable thereon in the axial direction thereof for holding a part on said second portion between said stop member and the rear end of said expansion member, wherein the improvement comprises that said stop member includes a locking member axially displaceable along and securable to said second portion, and a supporting member mounted on said locking member and being axially adjustable in the direction between said locking member and the rear end of said expansion member so that a part can be supported against said supporting member on the rear end side thereof and held in spaced relation to the support structure containing the bore hole, said supporting member is annularly shaped and is disposed in threaded engagement with said locking member, said locking member is annular in shape and has an inner surface, at least one elastic lug secured to and extending inwardly from the inner surface of said locking member and being displaceably engageable with said second portion for securing said stop member thereon, said second portion of said expansion member has at least one rack formed therein with said rack extending in the axial direction of said expansion member, said rack having a number of teeth spaced apart in the axial direction of said expansion member and said teeth extending transversely of the axial direction of said expansion member and for only a portion of the circumferential periphery of said expansion member, and said lug on said locking member arranged to interengage in said rack in the space between two adjacent said teeth thereof, and said locking member being rotatable relative to said expansion member so that said lug can be displaced by the rotation movement out of interengagement said rack.