| 摘要 |
A shoot-bolt fastening has a shoot-bolt 4, 5 connected to a handle operated mechanism 2 in a casing 3 by means of a composite connecting rod 1 comprising at least two elongate sections 12, 13, 14, 15, 16 connected end-to-end in axial alignment. At least one of the sections is a casting. Key operation of the mechanism 2 may be provided and a dead bolt 10 for locking the connecting rod 1. There may be a shoot-bolt 4, 5 at each end of the connecting rod which is connected at an intermediate part of its length to the handle operated mechanism. Sections 12, 14, 16 of the connecting rod connected to the or each shoot-bolt and to the handle operated mechanism are preferably made as rigid strips of plate metal, and one ore more cast intermediate section 13, 15 are connected between the rigid strip sections. The or each cast section may be of channel section and narrower than the strip sections. The inclusion of a cast section or sections in the composite connecting rod enables the rod to be made more cheaply than a conventional one piece connecting rod made as a continuous stamped metal strip, and without loss of strength.
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