A variety of other mechanisms also exist and have been used, including cam based, ball bearings trapped in a sliding collar, and bidirectional mechanisms that take pulling attachments.
2.
One variant of the Halligan has a heavy sliding collar on the shaft . Once the prying end of the tool is wedged into position, the sliding'hammer'is used to force the wedge, allowing for proper seating before prying.
3.
Each free-spinning gear has a dog clutch which is engaged by an axial sliding collar that transfers power to the shaft . The dog clutch may be plain, also called " non-synchromesh ", or may use an additional synchromesh mechanism that helps get the parts moving at the same speed to assist engagement.
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