A lift device comprises a base, a retractable lift mechanism, a work platform, a linear actuator, an electromagnetic brake, and a manual release device. The electromagnetic brake is movable between an engaged position and a disengaged position. In the event of a power failure, the electromagnetic brake is biased toward and engaged position, where an armature is biased away from a magnetic body and into contact with a friction disk by at least one engagement spring, thereby preventing rotation of the friction disk. In a disengaged position, a current is applied to the wire coil to produce an electromagnetic force on the armature that overcomes a spring force of the at least one engagement spring, thereby compressing the at least one engagement spring, pulling the armature out of contact with the friction disk, and allowing the rotation of the friction disk.

The present disclosure relates to a height accessible working platform. The disclosed working platform generally comprises a frame attachable to a lifting system for being moveable along the vertical axis and suspended thereto;a cradle; a first arm structure having a proximal end terminated to the frame and an distal end attached to the cradle, the first arm structure being extendable and retractable to displace the cradle respectively away from and closer towards one of lateral sides of the frame along a first axis substantially perpendicular to the vertical axis; and a counterweight mechanism mounting at one lateral side of the frame opposing to the cradle, the counterweight mechanism being configured to balance the working platform corresponding to displacement of the cradle along the first axis.

A mast arm for a large-scale manipulator is disclosed. The mast arm includes a turntable rotatable about a vertical axis, a two-point lever enclosing at least one cavity, and a plurality of mast arm segments. The plurality of mast arm segments are pivotable at articulated joints about articulation axes relative to an adjacent mast arm segment or the turntable via a respective drive unit. At least one of the respective drive units is fastened to a first mast arm segment and acts via the two-point lever on a second mast arm segment or on the turntable.

A lift device includes a chassis, tractive elements, a platform including a deck, a lift assembly, and a stair assembly. The lift assembly is configured to move the platform between a lowered position and a raised position. The stair assembly is coupled to at least one of the platform and the chassis and includes a first support and a second support extending parallel to one another. The stair assembly is repositionable between a stored position and a deployed position and facilitates access to the deck from the ground when in the deployed position. The first support extends farther outward horizontally than the second support relative to the chassis when the stair assembly is in the deployed position. The first support extends farther outward horizontally relative to the chassis when the stair assembly is in the deployed position than when the stair assembly is in a stored position.

The aerial work platform includes; a platform provided with a guardrail and a mechanism for lifting this platform; a desk for controlling the movements of the aerial work platform, one or more virtual-barrier systems for determining that an individual on the platform is close to a part of the guardrail adjacent to the desk and/or is leaning towards the desk, by detecting interference between the individual and the virtual barrier, the system inhibiting at least certain movements of the aerial work platform if it detects interference with the barrier. The virtual-barrier system includes at least one emitter and one receiver of waves, the system detecting interference of an external object with the barrier by the fact that the receiver receives waves emitted by the emitter by reflection off the object that is interfering with the barrier.

A foldable rail assembly is coupled to a platform and includes vertical rails and a rectangular rail structure that is hingedly coupled to the vertical rails. The rectangular rail structure is rotatable about hinged couplings formed between the rectangular rail structure and the vertical rails, and movable between a first, deployed position and a second, folded position. The rectangular rail structure extends upwardly from the platform higher in the first position than in the second position.

A lift device includes a chassis, a lift assembly supported on the chassis, a platform including a platform floor, a sensor coupled to the platform and positioned adjacent the platform floor, and a control system in communication with the lift assembly and the sensor. The sensor is oriented to sense objects or obstacles above the platform. The platform is displaceable by the lift assembly between a raised position and a lowered position.

A scissors lift vehicle includes a chassis, a first pair of wheels disposed at one end of the chassis and a second pair of steering wheels disposed at an opposite end of the chassis. The wheels include a circular profile having a radius R. The scissors lift vehicle includes a track having an upper surface and a lower surface extending aft at a height less than R above the travel surface. A pivot connection is coupled to the aft plate at a height less than R above the travel surface. A scissors stack assembly includes a plurality of paired scissors linkages. Each scissors linkage of a first pair of scissors linkages is coupled to a respective pivot connection. Each scissors linkage of a second pair of scissors linkages includes a truck coupled to a distal end. The truck is configured to engage the upper surface of the track.

An improved tool shelf assembly allows a user to store and organize tools while working on a scissor lift. The assembly includes a panel having a front surface and a back surface. A flange is coupled to the panel. The flange and the back surface form a channel configured to receive a handrail of a scissor lift to support the panel on the scissor lift. A lower shelf has a lower end, an upper end and a peripheral wall extending between the upper and lower ends. Each of the lower end, the upper end and the peripheral wall define an interior space of the lower shelf. The lower shelf is attached to and extends outwardly from the front surface. A plurality of openings is positioned in the lower shelf. Each of the openings provides access into the interior space wherein each of the openings is configured to receive a tool therein.

The disclosed subject matter is directed to a hydraulic steering shear-fork aerial work platform that comprises a running chassis and a lifting device. The running chassis includes a chassis body and a running device that comprises a left wheel carrier, a right wheel carrier, a linkage frame, and a steering oil cylinder. The left wheel carrier and the right wheel carrier are rotatably installed on the chassis body through wheel carrier shafts. The two ends of the linkage frame are respectively hinged to the left wheel carrier and the right wheel carrier. One end of the steering oil cylinder is installed at one end of the linkage frame, and the other end of the steering oil cylinder is fixedly connected with the wheel carrier shaft through an installing plate.