A snatch pulley block with a rotatable sheave mounted between relatively rotatable first 26 and second 27 side plates with a spring loaded anchor axle 21 which can extend between them to lock them in place. The anchor axle 21 has a radially extending locking pin 29 which engages an entry slot 31 in the second side plate with a closed end to limit longitudinal movement and cam rotate in an arcuate slot 34 to lock the side plates. The spring 33 may sit in grooves 35 & 36 in the first plate and on a flange 22 on the anchor axle when compressed and may be a helical spring. A spring loaded détente ball 37 may extend into a socket 39 on the anchor axle to releasably hold it in a position to allow rotation of the side plates. A secondary locking means with a button 24 which engages a notch on the flange may be used. The device can used by arborists or rock climbers.
Pulley blocks
2023-04-05
Patent
Elektronische Ressource
Englisch
Lifting hook device with pulley blocks and operation machine
Europäisches Patentamt | 2021
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