| 摘要 |
The present invention relates to a safety coupling arrangement ( 10 ) comprising a first coupling part ( 11 , that can be adapted for fixed co-action with a shaft, axle or the like that functions to transfer torque and rotary movement to said safety coupling, and a second coupling part ( 12 ) which is adapted for fixed co-action with a shaft, axle or the like to transfer torque and rotational movement from the safety coupling, and further comprising a safety unit ( 13 ). The safety unit is adapted to take one of two settings, a first setting, in which torque and rotary movement can be transferred between said two coupling parts ( 11, 12 ) and a second setting, in which no torque and rotational movement can be transferred between said two coupling parts. The safety unit ( 13 ) includes a subpart or a body ( 13 ') that can take said first setting as a result of expansion caused by applying pressure to a cavity ( 13 a) in the safety unit and enclosing said pressure in said cavity, and is able to take its second setting by evacuating said pressure from the cavity. The second coupling part ( 12 ) includes an axially directed or generally axially directed groove ( 12 a) which is adapted to be able to surround a pressure expandable subpart ( 13'; 13 b , 13 b') in said safety unit ( 13 ) or said first coupling part ( 11 ) and the whole or essentially the whole of said cavity ( 13 a), wherein said expandable subpart ( 13 '), when in its first setting, functions to allow torque to be transferred directly to said first coupling part ( 11 ) or said second coupling part ( 12 ) via two mutually opposing surface parts ( 13 c, 13 d) which are frictionally active against opposing outer parts ( 12 b, 12 c) of the axially directed groove ( 12 a).
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