Abstract: A headed multi-lobed blank, method of manufacturing a self-tapping screw from the blank, and resulting multi-lobed self-tapping screw for joining thin workpieces provides desirable thread-forming characteristics at the conical tip and body portions, and improved resistance to vibrational loosening near the head. The resulting screw, obtained from the blank and method, incorporates a threaded tapered root portion between the screw head and body portion having a cross section that varies from nearly circular in the area adjacent to the underside of the head to a maximum out-of-round (or lobular) cross section at the intersection of the tapered root portion and the screw body.

Abstract: A clip is formed of a male and a female members, and can take a temporarily fastened state by inserting an inserting shaft of the male member into an inner side of leg pieces of the female member and a finally fastened state by further inserting the inserting shaft. In the finally fastened state, the leg pieces are widely opened and fixed to the inserting shaft. The clip includes engaging projections, as a correcting device, disposed between the adjacent leg pieces facing each other and allowing the widely opened leg pieces to move inwardly when the male member is moved to the temporally fastened state. Thus, the clip can be easily fastened and removed.

Abstract: A combination sidewalk bolt is provided. The bolt includes a head portion, a threaded shaft portion extending perpendicularly outward from a first side of the head portion, a socket head recess well formed within a second side of the head portion for use in driving the bolt, and a slotted screwdriver slot provided in the second side of the head portion. A depth of the recess well is greater than the width of the head portion between the first side and the second side.

Abstract: A bolt retaining article retains a bolt within a bore of a structure prior to the bolt being threadingly engaged within the bore. The bolt retaining article includes a tubular body having concave sections and convex sections. The concave and convex sections alternate around the tubular body. A number of engaging arms extend outwardly from the exterior surface of the concave sections to secure the bolt retaining article within the bore of the structure. The compressive forces created by the compression of the bolt retainer article when it is inserted into the bore prevent it from falling out. Likewise, the compression of the bolt retaining article around the bolt prevents the bolt from slipping out once inserted into the bolt retaining article. The bolt may slide within the bolt retaining article, but only with the application of an external axial force.

Abstract: A fastening element including a cylindrical body (1) having, in its end portion remote from an end facing in a setting direction, a longitudinal bore (22) for receiving a mortar mass, and having, at it end facing in the setting direction, at least one through-opening (5) connecting the longitudinal bore (22) with an outer surface of the body (1), and a mixing device (8) located in the longitudinal bore (22) between the mortar mass and the through-opening (5).

Abstract: A dowel pin of an assembly arrangement for joining two furniture parts. The dowel pin includes a fixing part with a recess into which a dowel shaft is fitted and is then fixed by the deformation and/or pressing-together of a jacket area of the fixing part surrounding the recess.

Abstract: A union is adapted to butt two reused plastic bottles at their mouths to provide a teaching aid for simulating the forming of spring and convection due to a pressure difference between two spaces. The union includes a hollow tubular body having a radially extended middle partition. An internal screw thread is provided on an inner wall surface of the union at each side of the middle partition to engage with an external screw thread on the mouth of the plastic bottle. The middle partition is provided with two symmetrical through holes, each of which is axially divided into two parts by a radially inward projected annular rib. Each part of the through holes is sized for a suction tube of predetermined dimensions to insert thereinto.