A winch is disclosed having a drive cylinder, configured to be rotated by an applied force about its longitudinal axis and having at least three drive grooves. The winch also includes an idler with a longitudinal axis spaced apart from the longitudinal axis of the drive cylinder. A line is fed onto the winch by passing it over a first of the at least three drive grooves then around the idler and then around a second of the at least three drive grooves. The line is attached to one of a fixed object or the object to be moved. The winch is attached to the other of the fixed object or the object to be moved. As the applied force is applied to the drive cylinder, the line is gripped by the at least three drive grooves and a length of the line between the fixed object and the object to be moved is shortened, whereby the object is moved.

A winch includes a first electrically conductive cable for transferring electrical power and/or electrical data signals where the first electrically conductive cable is in the form of a spiral, a fixation unit coupled to a first portion of the first electrically conductive cable and configured to fix in place the first portion of the first electrically conductive cable, and a first support member coupled to a second portion of the first electrically conductive cable where the first portion and the second portion are different from each other, where the first support member is coupleable to a winch drum and is rotatable, together with the second portion of the first electrically conductive cable, with the winch drum in a rotational direction around an axis of rotation of the winch drum while the first portion of the first electrically conductive cable is fixed in place during the rotation of the winch drum.

A power winch with changeable connection position includes a first connection line and an induction line connected between a power source and an electric control box, which are connected to a second connection line for grounding the electric control box, and a third connection line is connected to the power source for grounding. These lines are connected to the exterior of the electric control box and the power source to facilitate a quick detachment from the electric control box and the power source.

A cable puller and associated methods are shown. Useful example methods include pipe bursting using cable pullers as shown. Cable pullers and methods shown provide a mechanical advantage that increases an amount of cable pulled in one cycle. Selected examples are shown that include a pulley located on a distal end of a moving portion of an extending and contracting beam. The pulley and the mechanical advantage it supplies helps to improve the efficiency of the cable puller and reduce manufacturing cost of the cable puller.

A cable puller and associated methods are shown. Useful example methods include pipe bursting using cable pullers as shown. Cable pullers and methods shown provide a mechanical advantage that increases an amount of cable pulled in one cycle. Selected examples are shown that include a pulley located on a distal end of a moving portion of an extending and contracting beam. The pulley and the mechanical advantage it supplies helps to improve the efficiency of the cable puller and reduce manufacturing cost of the cable puller.

A cable puller and associated methods are shown. Useful example methods include pipe bursting using cable pullers as shown. Cable pullers and methods shown provide a mechanical advantage that increases an amount of cable pulled in one cycle. Selected examples are shown that include a pulley located on a distal end of a moving portion of an extending and contracting beam. The pulley and the mechanical advantage it supplies helps to improve the efficiency of the cable puller and reduce manufacturing cost of the cable puller.

A cable puller and associated methods are shown. Useful example methods include pipe bursting using cable pullers as shown. Cable pullers and methods shown provide a mechanical advantage that increases an amount of cable pulled in one cycle. Selected examples are shown that include a pulley located on a distal end of a moving portion of an extending and contracting beam. The pulley and the mechanical advantage it supplies helps to improve the efficiency of the cable puller and reduce manufacturing cost of the cable puller.

A hoist system including an air balancer having an air supply and an air exhaust, a lifting device, and a hoist control pendant to control supply and exhaust of pressurized air to and from the air balancer, respectively, the hoist control pendant configured to control vertical movement of the lifting device. The air exhaust from the air balancer includes a first exhaust flow path through a first exhaust opening and a second exhaust flow path through a second exhaust opening, the first exhaust flow path having a first length and the second exhaust flow path having a second length, the second length being shorter than the first length.

A power winch with changeable connection position includes a first connection line and an induction line connected between a power source and an electric control box, which are connected to a second connection line for grounding the electric control box, and a third connection line is connected to the power source for grounding. These lines are connected to the exterior of the electric control box and the power source to facilitate a quick detachment from the electric control box and the power source. After the connection position between the electric control box and the power source is changed, a quick connection can be achieved to provide a wider range of use.

A cable puller and associated methods are shown. Useful example methods include pipe bursting using cable pullers as shown. Cable pullers and methods shown provide a mechanical advantage that increases an amount of cable pulled in one cycle. Selected examples are shown that include a pulley located on a distal end of a moving portion of an extending and contracting beam. The pulley and the mechanical advantage it supplies helps to improve the efficiency of the cable puller and reduce manufacturing cost of the cable puller.