A Building Element Lift Enhancer is described. The Building Element Lift Enhancer provides for the movement and precise placement of building elements such as blocks or sheet products by one worker. The Building Element Lift Enhancer senses the force applied by a user to the building element and converts that user applied force to mechanically assisted force from the Building Element Lift Enhancer, allowing the user to precisely move and handle large, heavy or bulky building elements by direct interaction with the building element.

A portable apparatus, and methods to operate the apparatus, comprising a base that securely engages with a tire, a motor support structure, an electric motor coupled to an electrical power source, a pulley system, one or more attachment devices, and an electrical motor control device utilized to raise and lower a windshield (or other component) from a vehicle.

A jib crane assembly having a vertical pole and a boom for lifting a load. The pole has a length and cylindrical outer surface. A pivot structure is arranged at an upper segment of the pole such that the boom is rotatably secured at a pivot point, thereby dividing the boom into first and second portions. A compression support extends from the first portion of the boom to a compression roller engagement assembly, and a tension roller engagement assembly is secured to the second portion of the boom, opposite the compression roller assembly. The tension roller assembly is attached to a tension frame, wherein said compression support, compression roller assembly, tension frame, and second portion of the boom provide structural support and counter-balance when lifting the load, and the pivot structure and roller assemblies facilitate rotation of the load around the pole.

A rotating tower crane for erecting a wind turbine, having a tower and a tower substructure, which is connected to the tower and is intended for supporting the tower, wherein the tower substructure has a supporting cross frame, which has three or more, preferably four, legs, extending from the tower. It is proposed that each leg has fastened on it, on the ground side, a load-distributor plate, which is not connected to the foundation, wherein the load-distributor plates together form the ballast of the tower.

A rotary crane including a vertical axis; an jib that extends from the vertical axis; a drive for rotating the jib about the vertical axis; a condition monitoring which determines wind loading, namely internal force variables, tensions, strains, transverse forces, tilting and torsion torques of the rotary crane; and a computing unit which computes a preferred direction for locking the jib from the wind loading. The invention also relates to a method for orienting the rotary crane. In order to improve the orientation of the jib of a shut down rotary crane it is proposed that the rotary crane includes measuring elements for capturing local measuring local values of the wind loading.

A gantry system has at least one crane assembly, at least one support post, and at least one hoist. The crane assembly has a stationary base, a rotating base, and a crane arm. The rotating base is attached to both the stationary base and the crane arm in such a ways as to allow the rotating base and the crane arm to rotate while the stationary base remains stationary. The crane arm is supported on its far end by a support post. The crane assembly is configured such that the support post rests on an in-place girder. A hoist is attached and can move along the crane arm to position a railway component, such as a replacement girder and/or a precast panel.

In some embodiments, a davit arm system comprises a davit body arranged to engage a support and an arm supported by the davit body. The arm is moveable along a length of the davit body. In some embodiments, a bearing is oriented between said arm and said davit body. In some embodiments, a bearing a polymer sleeve. In some embodiments, a bearing comprises rollers. In some embodiments, a bearing comprises ball transfer bearings. In some embodiments, a bearing excludes moving parts.

This disclosure provides a system and method for limiting a swing angle of a jib crane, the jib crane having a jib rotatably mounted to a mast. The device can have a collar having a collar height and a collar width, the collar being configured to be fit to the mast at a stop height. The device can also have one or more stopping tabs enagagable with the collar and configured to be positioned on the collar at one or more points about a circumference of the mast. The stop height can place the one or more stopping tabs in a position coincident with the jib to interfere with the swing angle of the jib. The method can use the device to limit the angle through which the jibe crane can swing unimpeded.

A crane, in particular a revolving tower crane or a bridge crane, and a method for controlling such a crane, having a hoist cable, which extends from a crane boom and carries a load-receiving means, drive devices for moving crane elements and displacing the load-receiving means, a control apparatus for controlling the drive devices such that the load-receiving means travels along a travel path, and a pendulum damping device for damping pendulum movements of the load-receiving means, wherein the pendulum damping device has a pendulum sensor for detecting pendulum movements of the hoist cable and/or of the load-receiving means and a controller component having a closed control circuit for influencing the control of the drive devices depending on pendulum signals that are indicated by pendulum movements detected by the pendulum sensor and are returned to the control loop.

A piloting system for piloting a crane in work, including at least: a piloting interface, a control-command system connected to the piloting interface, work actuators ensuring the displacements of the load, and variable-speed drives connected to the control-command system and to the work actuators to receive piloting commands originating from the control-command system and to transmit to the work actuators speed setpoints. At least one amongst the variable-speed drives, referred to as the common variable-speed drive, is connected to at least two work actuators, referred to as the shared actuators, by a distribution relay, so that the common variable-speed drive alternately pilots each of the shared actuators.