Power lines are installed with a rope brake apparatus that enables a rope to be suspended above the ground during installation and that thereby eliminates the need to block off the ground between power poles. The rope brake apparatus has a pair of opposed cam cleats mounted on a base adjacent each other for allowing movement of a rope between them in one direction and for preventing movement of a rope between them in an opposite direction.

A compact, efficient, and reliable electromechanical actuator that is capable of driving heavy loads at a high rate of speed and also capable of resisting large back driving forces. The actuator resists tension and compression back driving forces in a static state as well as when the actuator extends and retracts. The back driving forces are resisted even if the electronics (e.g., motor) fail.

A compact, efficient, and reliable electromechanical actuator that is capable of driving heavy loads at a high rate of speed and also capable of resisting large back driving forces. The actuator resists tension and compression back driving forces in a static state as well as when the actuator extends and retracts. The back driving forces are resisted even if the electronics (e.g., motor) fail.

A fall-protection apparatus with a rotationally-activated braking device including at least one first pawl that is a velocity-actuated pawl and at least one second pawl that is an acceleration-actuated pawl, the at least one first pawl and the at least one second pawl being independently actuated and independently functioning.

A fall-protection apparatus with a rotationally-activated braking device including at least one first pawl that is a velocity-actuated pawl and at least one second pawl that is an acceleration-actuated pawl, the at least one first pawl and the at least one second pawl being independently actuated and independently functioning.

A joint element provided with a swing dampener element and comprising a first joint part, a second joint part, and a swing dampener brake. The second joint part comprises a second end part which is detachably fixed to a first end part of the second joint part by a joint part coupling which is adapted to allow the second end part to be moved in an axial direction to a detached position in relation to the first end part, the detached position allowing replacement of active components of the swing dampener brake while the first end part remains bearing-mounted to the first joint part, the active components of the swing dampener brake comprising at least one first brake disc member and at least one second brake disc member.

A joint element provided with a swing dampener element and comprising a first joint part, a second joint part, and a swing dampener brake. The second joint part comprises a second end part which is detachably fixed to a first end part of the second joint part by a joint part coupling which is adapted to allow the second end part to be moved in an axial direction to a detached position in relation to the first end part, the detached position allowing replacement of active components of the swing dampener brake while the first end part remains bearing-mounted to the first joint part, the active components of the swing dampener brake comprising at least one first brake disc member and at least one second brake disc member.

Described is a carriage (1) for moving on a cable and/or rail comprising: a wheel (2) equipped with its own rotation shaft (3) and configured to rotate on a cable (C) and/or rail; braking masses (4) positioned parallel to the wheel (2) and made of non-magnetic material; magnetic masses (5) configured to generate a magnetic field; and a self-adjusting device (6), connected to the braking masses (4) and positioned inside the rotation shaft (3) of the wheel (2), configured for moving the braking masses (4) close to the magnetic masses (5) along a direction (D) parallel to an axis of extension of the rotation shaft (3), as a function of an increase in a speed of rotation of a wheel (2), in such a way that the magnetic masses (5) generate eddy currents by electromagnetic induction defining a slowing force proportional to the feed speed of the carriage (1).

A backstop of a torque transmission device of an aircraft steering system includes input and output sections of a drive shaft. Torque is transmitted from the input to the output, but is prevented from being transferred from the output back into the input. The input is limited from rotating coaxially relative to the output by more than a predetermined angle. The input stops at a first rotary position relative to the output upon rotating in a first rotary direction. The input stops at a second rotary position upon rotating in the opposite direction. The output is blocked from rotating in the second direction while the input is at the first rotary position and is blocked from rotating in the first direction while the input is at the second rotary position. The output is blocked from rotating by dissipating any torque acting upon the output into the housing of the backstop.

A knockdown, portable lift is relatively compact and lightweight for transport and use where there is no existing means for lifting a load between a lower surface and an upper surface or where the existing means cannot be used. Components of the lift are stored in a base portion of the lift and are assembled on site for forming a lift frame extending between the upper and lower surfaces. A platform and drive assembly are supported on the lift frame and are driven together up and down tracks on each side of the lift frame using a rotary drive, such as a hand crank or electric motor, to power the drive assembly. The drive assembly is operable by a person on or off the platform from either the upper or lower surface or traversing stairs over which the platform is moving. The drive assembly incorporates a unique overspeed braking system and a unique clutch arrangement.