Abstract: A self-drilling anchor for use in a friable material comprises a body having an axis, a flanged rear end, a drilling front end and a generally cylindrical portion therebetween having an outer surface with a thread disposed thereon, wherein the body forks, beginning at a predetermined distance from the flanged rear end, into a first leg and a second leg, the first leg extending forwardly into a drilling tip and having a generally rearward facing shoulder angled obtusely outwardly with respect to the axis, wherein the body has an axial bore for receiving an elongate fastener, the axial bore extending substantially through the flanged end and the generally cylindrical portion and leading to the generally rearward facing shoulder, wherein the anchor has a drilling mode wherein the second leg nests behind the generally rearward facing shoulder of the first leg, and an anchoring mode wherein the legs are pivoted apart from one another.

Abstract: A joining assembly for joining a pair of structural members, comprises a bolt having a thread and a nut-like blind rivet adapted to be inserted into mounting holes of the structural members and to be threadingly engaged to each other. One of the mounting holes is made of resiliently deformable material and comprises a base member including a bore for receiving the thread of the bolt and having an outside provided with a plurality of threads which are similar in number to the corners of the polygonal mounting hole, such that when the bolt is threadingly engaged into the bore of the blind rivet the base member is folded whereby the threads have parts of their flanks pressed against one of the structural members.

Abstract: The present invention is a wall anchor having a novel finger configuration. This wall anchor has a head and barrel portion with a bore extending therethrough and laterally expandable fingers in general alignment with the bore. Instead of a straight channel, a channel having curved portions separates the fingers. The curved portions of the channel define ramp surfaces that at least partially extend into the path of a securing member created by the bore. Thus, when a securing member, such as a bolt, pin, screw, nail or similar object is inserted into the bore to secure the wall anchor to the wall, the securing member contacts the two ramp surfaces, separating the fingers. As the fingers separate, a portion of the fingers near the ramp surfaces deform such that the ramp surfaces rest on an outer portion of the securing member, thus providing a securing force for connecting the wall anchor to the wall and relieving stress on the area at which the fingers are connected to the barrel.

Abstract: An apparatus comprising a sleeve insertable into a borehole, the borehole having a first diameter. A roof pin is inserted into the sleeve, the roof pin having a second outer diameter which is less than the first diameter. The outer surface has a peripheral dimension prior to insertion of the sleeve into the borehole. The inner or the outer surface contains at least one longitudinally extending yieldable channel portion which is of a lesser sleeve thickness than the remainder of the sleeve, permitting circumferential expansion of the sleeve. Expansion of the sleeve establishes a restraint between the roof pin and the borehole. When the sleeve is expanded within the borehole, continuous peripheral contact is made between the outer surface and the borehole.

Abstract: An axially extending anchoring bush has a pair of opposite ends with a blind borehole extending axially into the bush from one end with the blind borehole arranged to receive and secure an anchor bolt. The bush has at least three generally axially extending slots ranging from the end opposite the end in which the blind borehole is formed toward the other end. Each slot is located in a different plane with the planes extending obliquely of the axis of the bush. Slots extend inwardly from the axially extending outer surface of the bush and intersect inwardly of the outer surface. The planes of the slots define the axially extending sides of a pyramidally shaped expansion member located inwardly of the slot.

Abstract: Disclosed is a straddling dowel, of plastic, having a continuous screw insertion hole and several expansion segments that are formed by longitudinal slits in the dowel body and which extend from the circular head portion to the circular foot portion of the dowel. In the latter part, a female thread can be cut by the inserted screw, thereby rendering axial expansion of the dowel body posible. The expansion segments are formed by overlapping annular plates or discs which, on spreading or axial expansion in the form of an increase in diameter or spreading move relative to each other over the whole extent of the contacting surfaces of adjacent plates or discs, which contacting surfaces run obliquely or conically to the axis of the dowel.

Abstract: The present invention is a wall anchor having a novel finger configuration. This wall anchor has a head and barrel portion with a bore extending therethrough and laterally expandable fingers in general alignment with the bore. Instead of a straight channel, a channel having curved portions separates the fingers. The curved portions of the channel define ramp surfaces that at least partially extend into the path of a securing member created by the bore. Thus, when a securing member, such as a bolt, pin, screw, nail or similar object is inserted into the bore to secure the wall anchor to the wall, the securing member contacts the two ramp surfaces, separating the fingers. As the fingers separate, a portion of the fingers near the ramp surfaces deform such that the ramp surfaces rest on an outer portion of the securing member, thus providing a securing force for connecting the wall anchor to the wall and relieving stress on the area at which the fingers are connected to the barrel.