An adjustable platform system configured in or attached to a ladder having a moveable or adjustable platform assembly operatively coupled thereto. An adjustment mechanism is operatively connected to the first and second arm members and the platform member, whereby the platform member is selectively movable along a length of the ladder legs or the first and second arm members via the adjustment mechanism.

A portable structure for ascending to and descending from inaccessible places with a self-supporting work platform, structure being of the type formed by three legs, one of which is a length of ladder, the legs converging at the top where the platform is situated and where the three legs are joined, consisting of the corresponding supports and the corresponding lengths of ladder, wherein each of the three legs is linked to the platform at two connection and bracing points, distanced from each other, with angle mounting element being provided at one of the two connection points for each leg to prevent the legs from twisting and to establish a triangular distribution of forces; and wherein the portable structure thus formed does not need a bracing structure in the middle area between the different legs.

A portable structure for ascending to and descending from inaccessible places with a self-supporting work platform, structure being of the type formed by three legs, one of which is a length of ladder, the legs converging at the top where the platform is situated and where the three legs are joined, consisting of the corresponding supports and the corresponding lengths of ladder, wherein each of the three legs is linked to the platform at two connection and bracing points, distanced from each other, with angle mounting element being provided at one of the two connection points for each leg to prevent the legs from twisting and to establish a triangular distribution of forces; and wherein the portable structure thus formed does not need a bracing structure in the middle area between the different legs.

The present invention concerns a lifting apparatus, in particular a cross lifting beam, for lifting a first pylon segment of a concrete pylon of a wind power installation by means of a crane, including at least one fixing means for fixing the pylon segment to the lifting apparatus, and at least one release apparatus for releasing a connection between the lifting apparatus and the pylon segment.

An adjustable standoff for a platform hoist that can withstand hoisting objects along a track to a predetermined height weighing up to 500 pounds. The adjustable standoff for a platform hoist includes: (1) a frame having two side assemblies with hooks to attach the standoff to only the rungs and thereby avoid blocking the side rails that act as the track for the hoist; (2) two legs that are able to adjusted radially within the plane of the side assemblies so that the standoff can withstand the force exerted by loads weighing 500 pounds being hoisted up; and (3) an anchor section to securely fasten the hoist to the structure to avoid the hoist sliding down the ridge of the roof and allowing the heavy loads to crash to the ground with potentially catastrophic consequences for both the structure and the operators below.

A ladder trolley includes a trolley frame having an upper end longitudinally spaced apart from a lower end. The trolley frame has longitudinally extending laterally spaced apart first and second side flanges; webbing connecting the first and second side flanges; and a ladder travel channel extending from the upper end to the lower end. The channel is defined by at least the first and second side flanges and the webbing and is open at the upper and lower ends. The ladder trolley includes at least one pair of ladder side rollers moveably connected to the trolley frame. Each pair of ladder side rollers has first and second ladder side rollers being laterally moveable and resiliently biased laterally into the channel. The ladder trolley includes a payload support connected to the trolley frame exterior to the ladder travel channel.

A ladder trolley includes a trolley frame having an upper end longitudinally spaced apart from a lower end. The trolley frame has longitudinally extending laterally spaced apart first and second side flanges; webbing connecting the first and second side flanges; and a ladder travel channel extending from the upper end to the lower end. The channel is defined by at least the first and second side flanges and the webbing and is open at the upper and lower ends. The ladder trolley includes at least one pair of ladder side rollers moveably connected to the trolley frame. Each pair of ladder side rollers has first and second ladder side rollers being laterally moveable and resiliently biased laterally into the channel. The ladder trolley includes a payload support connected to the trolley frame exterior to the ladder travel channel.

A drive for a material hoist system can include a housing configured to be slidably coupled to a track of the system; a motor positioned inside the housing; a gearbox positioned inside the housing and coupled to the motor; and a spool positioned inside the housing between the motor and the gearbox, the spool configured to: selectably wind and unwind a flexible connecting element coupled to the track; and drive movement of the drive along a longitudinal direction of the track.

A drive for a material hoist system can include a housing configured to be slidably coupled to a track of the system; a motor positioned inside the housing; a gearbox positioned inside the housing and coupled to the motor; and a spool positioned inside the housing between the motor and the gearbox, the spool configured to: selectably wind and unwind a flexible connecting element coupled to the track; and drive movement of the drive along a longitudinal direction of the track.

A tool cart and ladder hoist system for providing a safe and efficient manner for carrying tools. The tool cart includes a tool compartment, a hoist ring, at least one wheel, and at least one support strap. The tool cart is defined by a pair of side walls, a back wall, a handle portion, and a base. The ladder hoist component includes a winch casing, a removable carrier casing, and at least one fastener pin. The ladder hoist component interacts with the hoist ring to provide a method for lifting tools. The tool cart may also include compartments for carrying and housing various tank components.