Chain – staple – and horseshoe making – Chains – Conduit
Patent
1981-04-28
1984-08-28
Crane, Daniel C.
Chain, staple, and horseshoe making
Chains
Conduit
59 84, 59 95, 403 2, 280457, 188371, F16G 1300
Patent
active
044675984
ABSTRACT:
An energy absorbing chain which can be used as a "one shot" safety chain to absorb sudden impacts or short term tensional forces is disclosed. According to the invention, the safety chain is made of a metal having high ductility such that the chain will tend to deform, stretch, and/or deflect rather than break. According to a preferred embodiment, the chain may include links such as links (36), (38), (40) and (42) each of which includes a twist of 90.degree. to increase the amount of available deformation. In the preferred embodiment, link (36) and (40) include a twist in a first direction such as a clockwise direction whereas links (38) and (42) which alternate with links (36) and (40) include a 90.degree. twist in the opposite or counterclockwise direction. Thus upon receiving or being subjected to such tensional forces, the links can deform as shown by links (58), (60) and (62) as they absorb energy for a short period of time. The energy absorbing chain of this invention is particularly suitable for use as a safety chain for attaching towed and towing vehicles together. Thus, a safety chain such as chain (94) is attached between a towing vehicle (86) and a towed vehicle (90) such that if the coupling becomes disengaged the safety chain (94) will provide an opportunity for the two vehicles to be brought under control as they move down a roadway.
REFERENCES:
patent: 515023 (1894-02-01), Salathe
patent: 1074632 (1913-10-01), Lashar
patent: 2238883 (1941-04-01), Hegelheimer
patent: 3265407 (1966-08-01), Paddock
C. H. A. McCaully, "The Chain Tester's Handbook", 6/19/56, pp. 5, 6, 7, 8 and 9.
Crane Daniel C.
Jones David B.
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