| 摘要 |
<p>1,184,142. Making rivets; forging. KERBKONUS-GESELLSCHAFT DR. CARL EIBES & CO. 14 March, 1968 [18 March, 1967], No. 12379/68. Headings B3A, B3H and B3U. [Also in Division F2] A slotted shank rivet 14 is formed between dies 1, 2, 3, 5 which co-operate to form the head 13 and lugs 7 defined by a slot 8 formed in the shank. The slot has a narrow base 15 which may be square or round and the diverging lugs are pressed inwards by tools 9, 10 after being formed by the dies until they have or are within the cross-section of the undeformed part 6 of the shank and the walls defining the slot are convergent or parallel. The outer wall of the shank is shaped by at least two dies 1, 2 which hold the rivet during its end deformation. The projection 4 of the upper die 3 may have an even or odd number of arms, Figs. 3, 4 (not shown). After the die forming the header die 5 is removed and the rivet released by dies 1, 2 to fall under gravity. The header die may have a frusto-conical projection 16 to form a recess in the head through which a setting pin (18), (18a), Figs. 9, 10 (not shown), can be forced to fracture the metal between the recess and the slot. The projection can be separate from the header die, Fig. 12 (not shown).</p> |
