| 摘要 |
PCT No. PCT/US81/01129 Sec. 371 Date Aug. 21, 1981 Sec. 102(e) Date Aug. 21, 1981 PCT Filed Aug. 21, 1981.A solenoid having a linear pull stroke includes a coil operated plunger (16) having a lost motion coupling (20,28,32,38,40) adapted to be connected with a load in order to allow the plunger (16) to retract a predefined distance during the initial part of the stroke thereby to develop a higher level of pulling force before substantial force is actually imparted to the load. The plunger (16) comprises an elongate body (18) having a piston-like link (28) slidably mounted in a cavity (20) at one end of the body (18) and adapted to be coupled with the load. A spring (36) trapped between the link (28) and the body (18) resets the link (28) relative to the body (18) before the pull stroke is completed.
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