A lift system for lifting a load includes a counterweight, a base unit, a fly line, a load line, and pulleys. The base unit includes a movable cam assembly coupled to a fixed frame. The cam assembly includes a cam member that is rotatable relative to a carriage of the cam assembly. The cam assembly can be moved between first and second positions relative to the frame member, and prevents movement of the fly line through the base unit in the first position, while movement of the fly line through the base unit is allowed when the cam assembly is in the second position.

A portable winch and method of use is shown. One advantage of winches shown includes an ability to lower a boom or boom sections into limited access exit pit for winching operations such as pipe bursting. Sectional boom designs shown provide the ability to easily raise and lower a boom large distances without the need for a single long boom. Selected winch designs shown include flexible inserts between the boom and the winch frame that help resist damage from unforeseen shifting of the device during operation. Designs and methods shown also include multiple pulleys on a boom end unit. Fasteners are shown that reduce build up of debris.

The pulley device comprises first and second pulleys each provided with a set of sheaves. The two pulleys are designed to be respectively fixed to a fixed point and to a person to be rescued. A rope is fixed to one of the two pulleys and arranged in such a way that the first pulley moves towards the second pulley when a pull is exerted on the rope. An enclosure connects the first pulley to the second pulley and surrounds the path of the rope between the two pulleys. One end of the rope extends outwards from the enclosure to enable a pull to be exerted on the end of the rope.

The pulley device comprises first and second pulleys each provided with a set of sheaves. The two pulleys are designed to be respectively fixed to a fixed point and to a person to be rescued. A rope is fixed to one of the two pulleys and arranged in such a way that the first pulley moves towards the second pulley when a pull is exerted on the rope. An enclosure connects the first pulley to the second pulley and surrounds the path of the rope between the two pulleys. One end of the rope extends outwards from the enclosure to enable a pull to be exerted on the end of the rope.

A hook block suspended by a wire rope and provided with: sheave shaft parts for rotatably supporting hook sheaves; a connecting shaft inserted into shaft holes that penetrate the sheave shaft parts in the axial direction; brackets which support the sheave shaft parts by fitting the same in engaging holes in first piece parts, which are provided with second piece parts substantially orthogonal to the first piece parts, and in which insertion holes are formed, the insertion holes enabling the insertion of the upper side of a hook in a mutually facing arrangement; a bracket-fixing member supported by the second piece parts above the second piece parts; and a hook support member rotatably arranged above the bracket-fixing member and fixed to the outer periphery of the upper side of the hook.

A self-aligning apparatus for a lifting system includes a structure which includes a first element having a first projecting free end and a second projecting free end which each receive at least one sheave at a point of attachment to the first element, and at least two first points of rotation. The at least one sheave cooperates with at least one wire. The at least two first points of rotation are arranged above the at least one sheave's point of attachment to the first element so that the apparatus self-aligns during use in an uneven loading event.

A self-aligning apparatus for a lifting system includes a structure which includes a first element having a first projecting free end and a second projecting free end which each receive at least one sheave at a point of attachment to the first element, and at least two first points of rotation. The at least one sheave cooperates with at least one wire. The at least two first points of rotation are arranged above the at least one sheave's point of attachment to the first element so that the apparatus self-aligns during use in an uneven loading event.

A rescue device includes a pulley includes a support flange with two rotation shafts mounted salient and extending in a first direction. Two sheaves are mounted rotatable around two rotation shafts to define a running line of a cable. Two flanges are mounted rotatable between a first position and a second position. A first blocker is configured to present a first position blocking the first flange in the closed position and a second position allowing rotation of the first flange. A second blocker is configured to present a first position blocking the second flange in the closed position and a second position allowing rotation of the second flange. The second blocker is independent from the first blocker.

A rescue device includes a pulley includes a support flange with two rotation shafts mounted salient and extending in a first direction. Two sheaves are mounted rotatable around two rotation shafts to define a running line of a cable. Two flanges are mounted rotatable between a first position and a second position. A first blocker is configured to present a first position blocking the first flange in the closed position and a second position allowing rotation of the first flange. A second blocker is configured to present a first position blocking the second flange in the closed position and a second position allowing rotation of the second flange. The second blocker is independent from the first blocker.

A roof support system and method to stabilize the roof of a transport vehicle during repair work. The system includes a roof support assembly with a planar base, support members, a lower post, and an upper post that is slidably coupled to the lower post. A winch mounted on the lower post operates a pair of winch cables that pass through pulleys on the upper post, allowing the upper post to move upward and bring a horizontal support bar into contact with the roof.