| 摘要 |
1,072,131. Securing studs to work; nails. ANSTALT FAR MONTAGE-TECHNIK. Sept. 16, 1964 [Sept. 17, 1963], No. 37749/64. Heading F2H. A nail or a stud (e.g. with a screwthreaded head and tapered shank) has a ring 2 of material such as hardened metal on its pointed end 1 so that when the fastener is driven into fibrous material such as wood, e.g. by explosive, the ring punches a hole through without splitting the material. When the fastener penetrates hard material such as concrete in its further travel, the ring is driven back along the shank until it splits and the fibrous material is secured to the hard material. The ring 2 may be a force fit on the pointed end 1 and may have an axial length similar in size to its outer diameter which approximates to that of the fastener shank. A synthetic plastics sleeve (3), Fig. 2 (not shown), may be moulded over a ring (2a) to grip the pointed end near the shank and position the ring. The ring may be a sleeve (2b), Fig. 3 (not shown). |
