Disclosed is a dual pawl 8 suitable for use with a toothed ratchet wheel 2 or rack. The dual pawl comprises: a first pawl arm 10 having a base end 11 and an engaging end 12 for engaging a tooth 3 on the ratchet wheel or rack; and a second pawl arm 20 having a base end 21 and an engaging end 22 for engaging a tooth on the ratchet wheel or rack. The first and second pawl arms are rotatable about a common axis via their base ends. Cooperating features of the two pawl arms interact with each other such that as one pawl arm disengages from the teeth, the other pawl arm is urged into engagement with the teeth. The base end of each pawl arm may be rotatably mounted to a common pawl stand 9. The base end of each pawl may comprise a bore adapted to be rotatably mounted on the pawl stand. The cooperating features may comprise opposing interacting mating faces. The pawl arms may comprise biasing means. Also disclosed is a ratchet comprising a wheel or rack having at least one dual pawl as presently disclosed. Further disclosed is a hoist comprising said ratchet.
Improvements in or relating to ratchets
2018-05-30
Patent
Electronic Resource
English
IPC: | B66D Haspeln , CAPSTANS / B25B TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING , Werkzeuge oder Werkbankvorrichtungen zum Befestigen, Verbinden, Lösen oder Halten, soweit nicht anderweitig vorgesehen / F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen |