A trolley installer for use with a crane bridge is configured for supporting a trolley thereon. The trolley installer includes a lift system adapted for mounting to the crane bridge. The lift system includes a lift mechanism and a strand coupled to the lift mechanism. The trolley installer also includes a platform member including a table for supporting a trolley and an attachment mechanism for releasably coupling with the strand of the lift system. The lift mechanism is operable to lift and lower the platform member relative to the crane bridge.

An articulable lifting attachment is provided for a mechanical articulated arm. The articulable lifting attachment comprises an attachment body, a clamping head and a drivable articulator coupling interposed between the attachment body and the clamping head. The clamping head is configured to provide two different clamping forces from different directions to ensure that irregular objects can be lifted safely.

A lifting tool assembly is disclosed, including a crossbar having a long axis spanning between first and second end portions. A first hook member is pivotably suspended from the first end portion and a second hook member is pivotably suspended from the second end portion. The end portions are symmetrically angled relative to the long axis and each hook member includes first and second finger structures.

A lifting tool assembly is disclosed, including a crossbar having a long axis spanning between first and second end portions. A first hook member is pivotably suspended from the first end portion and a second hook member is pivotably suspended from the second end portion. The end portions are symmetrically angled relative to the long axis and each hook member includes first and second finger structures.

Modular crane attachment device for purlins is a crane attachment jig that attaches to the hook of a crane and functions to lift a plurality of purlins in one lift to place each purlin at the precise location on the rafters of a building under construction to allow for immediate attachment of all purlins to the rafters wherein each purlin is fastened into place while held by the crane and modular crane attachment device for purlins, which functions as a giant assembly jig in this manner. Modular crane attachment device for purlins is modular so that it can be broken down by hand into a bundle of 10-20 foot long structural members, fittings, and cables. Modular crane attachment device for purlins is modular so it can be assembled in any length and width to fit any application of any number and any length of purlins required for the building.

A shackle clamp assembly has one end configured as a cap for insertion on the end of a shackle bolt attached to a U-shaped shackle and second end configured as a loop for attachment around the U-shaped shackle. The cap has an aperture that aligns with a through-bore in the end of the shackle bolt. A pin is inserted through the aperture of the cap and the through-bore of the shackle bolt to retain the cap on the end of the shackle bolt. The cap abuts the nut threaded on the end of the shackle bolt to ensure that the nut does not become disconnected from the shackle bolt.

Modular crane attachment device for purlins is a crane attachment jig that attaches to the hook of a crane and functions to lift a plurality of purlins in one lift to place each purlin at the precise location on the rafters of a building under construction to allow for immediate attachment of all purlins to the rafters wherein each purlin is fastened into place while held by the crane and modular crane attachment device for purlins, which functions as a giant assembly jig in this manner. Modular crane attachment device for purlins is modular so that it can be broken down by hand into a bundle of 10-20 foot long structural members, fittings, and cables. Modular crane attachment device for purlins is modular so it can be assembled in any length and width to fit any application of any number and any length of purlins required for the building.

The invention relates to a tower crane, preferably a rotary tower crane, particularly preferably a top-slewing crane, comprising a jib and a counter-jib. The jib and/or counter-jib is hinged to the tower top and/or rotating platform by means of at least one connection point. A first connection part of the at least one connection point has a concave stop surface, and a second connection part of the connection point comprises a convex counter-stop surface, wherein the counter-stop surface of the second connection part acts on the stop surface of the first connection part by means of a pressure force in order to produce a force-fitting connection between the connection parts.

A shackle clamp assembly has one end configured as a cap for insertion on the end of a shackle bolt attached to a U-shaped shackle and second end configured as a loop for attachment around the U-shaped shackle. The cap has an aperture that aligns with a through-bore in the end of the shackle bolt. A pin is inserted through the aperture of the cap and the through-bore of the shackle bolt to retain the cap on the end of the shackle bolt. The cap abuts the nut threaded on the end of the shackle bolt to ensure that the nut does not become disconnected from the shackle bolt.

A shackle clamp assembly has one end configured as a cap for insertion on the end of a shackle bolt attached to a U-shaped shackle and second end configured as a loop for attachment around the U-shaped shackle. The cap has an aperture that aligns with a through-bore in the end of the shackle bolt. A pin is inserted through the aperture of the cap and the through-bore of the shackle bolt to retain the cap on the end of the shackle bolt. The cap abuts the nut threaded on the end of the shackle bolt to ensure that the nut does not become disconnected from the shackle bolt.