A portable derrick system for use in hoisting and lowering loads at a plurality of job sites, comprising, in combination: a boom subassembly, a boom head subassembly, a mast support subassembly, a mast head subassembly, a load-carrying line, a winch capable of cooperating with said line, power means for driving the winch, means for pivoting the boom assembly, means for controlling said pivoting means, the foregoing elements of the invention capable of being transported by humans to elevated positions such as, without limitation, rooftops and terraces, and wherein the aforementioned are capable of repeated assembly and disassembly at a plurality of job sites and serving to facilitate the elimination of the need for a street-level crane.

A line guidance device (40) is provided for use with a confined space entry/retrieval hoist and fall protection anchorage system (10) and includes a line guide (46) that guides a line from an extend/retract line device (22) past another extend/retract line device (20) with both devices (20, 22) mounted on a backside (24) of a mast (12) of the system (10).

The invention provides a bearing. In particular, the invention provides a bearing for allowing a column of a davit to be rotatably mounted on a substantially upright shaft. The bearing has a body shaped to correspond to an internal profile of the column. The body has a first bore for receiving a component on which the bearing bears and a first pair of parallel, spaced second bores, narrower than the first bore, which extend across the first bore in a direction perpendicular to an axis of the first bore and are configured to receive retaining pins which engage with a groove in the component received in the first bore. A single bearing can be used to rotatably couple the davit to the shaft, or king post, with a plurality of different-spaced bores to account for different diameters of shaft. This improvement allows the davit to be manufactured easily and erected easily by users.

A portable gantry crane formed of composite members includes a composite material I-beam. Two or more support members are formed of a composite material and each support member supports the I-beam when the portable gantry crane is in an upright position. Two or more end housings are included, each end housing enclosing a top end of one of the two or more support members and coupled thereto using adhesive. A plurality of latch structures are coupled with the I-beam, each latch structure including a latch, and each end housing having a latch receiver, each latch in combination with a latch receiver allowing one of the latch structures to be releasably fixedly coupled with an end housing. In implementations a plurality of latch structures are coupled with the I-beam, each latch structure having a latch structure enclosure and each latch structure enclosure at least partially enclosing one of the end housings.

A davit used for abseiling purposes and adapted to anchor to a parapet roof includes a davit base assembly and a mast base assembly associated with a mast and configured to rotation about the davit base assembly. The davit base assembly includes a mounting plate sub-assembly adapted to anchor to the roof, and a removable base sub-assembly configured to cooperate with the mounting plate sub-assembly. The mast base assembly includes a roller bearing arrangement configured for contact with a sleeve of the removable base sub-assembly during rotation of the mast and the associated mast base assembly about the davit base assembly.

A davit system has a davit arm and a davit mount. The davit mount includes a mount body, a clamping mechanism for clamping the corner flange of the air conditioning unit, and an arm mounting element for pivotally mounting the davit arm on the davit mount. When the mount body is mounted on the corner flange of the air conditioning unit, the davit arm extends laterally over the head of the air conditioning unit, and pivots away from the air conditioning unit for removing the head during servicing.

A pipe lifting apparatus and method related thereto are provided, wherein the pipe has a base with outriggers, a vertically extending beam having a pulley at its upper end and a cable attached to a winch and extending over the pulley. The pulley and winch are oriented so that the cable extends naturally in line with a vertex between two of the outriggers such that, when a pipe in a vertical sleeve is attached to the distal end and is lifted by the cable, the pipe passes adjacent to the vertex. The apparatus is configured to raise pipes from a vertical pipe sleeve used in floating roofs of above-ground storage tanks. The apparatus can be used to raise and lower pipes and to move them around the upper surface of the floating roof of the tanks

A fall protection system includes a base assembly, a mast assembly, and a locking assembly adapted to lock the mast assembly with the base assembly. The locking assembly includes a first plate and a second plate. The locking assembly also includes a fixed member fixedly coupled to the second plate. The locking assembly further includes a locking pin including an elongate portion at least partially received within the fixed member and a first tab, the locking pin being movable relative to the fixed member between an engaged position and a disengaged position. In the engaged position, the first tab is at least partially received within a first groove such that the locking pin is engaged with the first plate. Further, in the disengaged position, the first tab is at least partially received within a second groove such that the locking pin is spaced apart from the first plate.

The invention relates to a hoist mechanism (20) intended primarily, but not exclusively, for moving a motor driven wheelchair or scooter into and/or out of the load carrying space of a vehicle. The hoist mechanism (20) comprises a lifting arm having, at least in part, a generally U-shaped cross section, and an actuator (28). A mounting point (56) for the actuator (28) is provided within the generally U-shaped cross section. The invention also relates to a stepless adjustment system suitable for use in such a hoist mechanism (20). The adjustment system comprises an inner section (34) received within an outer section (24) in a telescoping arrangement. The outer section (24) comprises first and second body portions (44A, 44B) provided with features for engaging corresponding features (48A, 48B) provided on the inner section (34).

Work platform, comprising an elevatable platform deck provided with a rail system having one or more rails extending in a longitudinal direction along a trailing edge of the deck; a trolley engaging with the one or more rails and configured for being moved in the longitudinal direction; and a crane device mounted on the trolley, configured for lifting and moving objects above the platform surface.