A lift device comprises a base, a retractable lift mechanism, a work platform, a linear actuator, and a descent control mechanism. The base has a plurality of wheels. The retractable lift mechanism has a first end coupled to the base and is moveable between an extended position and a retracted position. The work platform is configured to support a load. The work platform is coupled to and supported by a second end of the retractable lift mechanism. The linear actuator is configured to selectively move the retractable lift mechanism between the extended position and the retracted position. The linear actuator has an electric motor. The descent control mechanism is configured to reduce a speed at which the retractable lift mechanism is moved from the extended position to the retracted position.

A braking device of at least one rotary shaft (S) extending along an axis X includes an actuation unit (I) comprising at least one winding (B), two friction discs (D1, D2), an end flange (F1), an intermediate flange mounted between the two friction discs (D1, D2), and two magnetic armatures (A1, A2) biased by two series of springs (R1, R2). The magnetic armatures (A1, A2) are arranged in series along the longitudinal axis X, with each of the series of springs (R1, R2) respectively biasing a magnetic armature (A1, A2). A series of springs (R2) passes through the thickness of one of the two magnetic armatures (A1) in order to bias the other magnetic armature (A2).

A braking assembly for an air disc brake comprises an actuator assembly having a service portion, at least one mounting stud attached to the service portion, and an air disc brake caliper having a bore for receiving the at least one mounting stud. The mounting stud is pivotable with respect to the service portion for installation on the air disc brake caliper.

A braking assembly for an air disc brake comprises an actuator assembly having a service portion, at least one mounting stud attached to the service portion, and an air disc brake caliper having a bore for receiving the at least one mounting stud. The mounting stud is pivotable with respect to the service portion for installation on the air disc brake caliper.

A friction element latch device includes: a screw provided to be rotatable by receiving power from a driving source; a piston arranged to be movable by rotation of the screw; a guide arranged to selectively restrict movement of the piston; a guide pin protruding in a radial direction from an outer circumferential surface of the piston and guided by the guide; and a friction element arranged to be engaged as the piston moves.

A friction element latch device includes: a screw provided to be rotatable by receiving power from a driving source; a piston arranged to be movable by rotation of the screw; a guide arranged to selectively restrict movement of the piston; a guide pin protruding in a radial direction from an outer circumferential surface of the piston and guided by the guide; and a friction element arranged to be engaged as the piston moves.

Provided is an electric brake device of which braking control accuracy is improved as a result of hysteresis in a load sensor being appropriately compensated for. The electric brake device includes: a direct load estimator configured to estimate a brake pressing force, using an output of the load sensor; an indirect load estimator configured to estimate a brake pressing force without using the output of the load sensor; and a hysteresis interpolator. When switching is performed between pressure increase and pressure decrease which causes hysteresis in the load sensor, the hysteresis interpolator performs control by use of the load estimated by the indirect load estimator without using the load sensor, in a predetermined range after the switching has been performed.

Provided is an electric brake device of which braking control accuracy is improved as a result of hysteresis in a load sensor being appropriately compensated for. The electric brake device includes: a direct load estimator configured to estimate a brake pressing force, using an output of the load sensor; an indirect load estimator configured to estimate a brake pressing force without using the output of the load sensor; and a hysteresis interpolator. When switching is performed between pressure increase and pressure decrease which causes hysteresis in the load sensor, the hysteresis interpolator performs control by use of the load estimated by the indirect load estimator without using the load sensor, in a predetermined range after the switching has been performed.

A parking brake apparatus may include: a driving part; a driving gear rotatably connected to the driving part; a gear shaft engaged with the driving gear so as to be rotated by the driving gear; a pair of pistons disposed on both sides of the gear shaft and connected to brake shoes, respectively; a pair of nuts disposed in the respective pistons, and screwed to the gear shaft; an elastic member installed between the piston and the nut so as to pressure the nut toward the brake shoe; a holder installed in the piston so as to support the elastic member; and a constraint ring installed in the piston so as to constrain the holder.

A parking brake apparatus may include: a driving part; a driving gear rotatably connected to the driving part; a gear shaft engaged with the driving gear so as to be rotated by the driving gear; a pair of pistons disposed on both sides of the gear shaft and connected to brake shoes, respectively; a pair of nuts disposed in the respective pistons, and screwed to the gear shaft; an elastic member installed between the piston and the nut so as to pressure the nut toward the brake shoe; a holder installed in the piston so as to support the elastic member; and a constraint ring installed in the piston so as to constrain the holder.