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This device is about 24”x8”x4”. The box on the side appears to function as a shock absorber. The flat black liner inside the blue steel is rubber. The three spools are steel I think. Please tell me how this device was meant to be used.
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My first thought is a brake for lowering something with rope. Wind the rope through the rollers and restrain the loose end to control how fast it feeds through the device, sort of like a reverse capstan. Marine use maybe?
I doubt if free-wheeling rollers would be used for braking.
Lowering and lifting are two forms of the same thing. There is no mfr, ( at least OP didn't mention it) no safe working load, and no means of inspection, all required for any form of overhead lifting ( or lowering).
Doesn't look like any of the commercial inline shock absorbers I've seen. Nor Google.
Looks more like a device to keep cables from snarling from backlash.
Blast mats need stuff like that - a field-expedient often being a truck tire.
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