Hand Winch

Features: The general principle may be described as a ?hand-over-hand? principle like a sailor pulling on a rope: while one hand pulls, the other one changes position in order to pull in turn. The 2 jaw grips represent the 2 hands of the TRV: they grip the wire rope without damaging it and alternately haul it during forward motion and clamp it during reverse motion. The effort is transferred to the jaws by means of 2 levers-one for forward motion and the other for reverse motion-which act by means of a cam system on the keys that command the automatic clamping of the jaws on the rope. Functioning of the keys: 1.The jaw grips are made of 2 jaws which can be brought together (clamping) or separated (unclamping) by means of keys actuated by ievers called jaw-links. 2.When the jaw-link is moved to the left, the jaws are clamped on the wire rope in order to draw it or maintain it in position. 3.When the jaw-link is moved to the right, the jaws are unclamped in order to alow the wire rope to slip through but only in the direction opposed to the motion of the wire rope. Safety: If you operate a TRV hand winch yourself in reverse, you will very quickly become aware of how perfectly safe it is. You will, of course, notice that you must exert a certain effort on the lever. This effort corresponds to the effort required to force the wire rope through the unclamped jaw which does not open but acts continuously as a secondary braking device.