An interlock between a drawworks and a blowout preventer includes a sensor for sensing a position of the blowout preventer. An interlock signal is generated by the sensor, and the interlock signal is reflective of the position of the blowout preventer. A lock operably connected to the drawworks receives the interlock signal and disables operation of the drawworks if the interlock signal meets a predetermined criterion. A method for operating a drill rig includes operating a drawworks to raise and lower a drill string and operating a blowout preventer. The method further includes sensing a position of the blowout preventer and generating an interlock signal that reflects the position of the blowout preventer. The method further includes comparing the interlock signal to a predetermined criterion and disabling the drawworks if the interlock signal meets the predetermined criterion.

An interlock between a drawworks and a blowout preventer includes a sensor for sensing a position of the blowout preventer. An interlock signal is generated by the sensor, and the interlock signal is reflective of the position of the blowout preventer. A lock operably connected to the drawworks receives the interlock signal and disables operation of the drawworks if the interlock signal meets a predetermined criterion. A method for operating a drill rig includes operating a drawworks to raise and lower a drill string and operating a blowout preventer. The method further includes sensing a position of the blowout preventer and generating an interlock signal that reflects the position of the blowout preventer. The method further includes comparing the interlock signal to a predetermined criterion and disabling the drawworks if the interlock signal meets the predetermined criterion.

A lifting equipment is provided. The lifting equipment may include a working assembly, a safety assembly, and a shaft assembly. The working assembly may include a working fastener. The working fastener may be spirally connected to the shaft assembly. When the shaft assembly rotates the working fastener may move along the shaft assembly. The safety assembly may comprise a limiting component. The limiting component may be connected to the working fastener. A portion of the safety assembly may be in located a space between the limiting component and the working assembly.

A lifting equipment is provided. The lifting equipment may include a working assembly, a safety assembly, and a shaft assembly. The working assembly may include a working fastener. The working fastener may be spirally connected to the shaft assembly. When the shaft assembly rotates the working fastener may move along the shaft assembly. The safety assembly may comprise a limiting component. The limiting component may be connected to the working fastener. A portion of the safety assembly may be in located a space between the limiting component and the working assembly.

An elevator brake disk assembly is provided. The elevator brake disk assembly includes a brake disk which is keyed to and rotatable with a shaft of an elevator machine, a machine frame and dampers. The dampers are respectively anchored to the machine frame and biased to symmetrically hold the brake disk during rotations thereof.

An elevator brake disk assembly is provided. The elevator brake disk assembly includes a brake disk which is keyed to and rotatable with a shaft of an elevator machine, a machine frame and dampers. The dampers are respectively anchored to the machine frame and biased to symmetrically hold the brake disk during rotations thereof.

An illustrative example embodiment of an elevator brake device includes a brake member configured to move into a braking position to resist movement of an elevator car associated with the brake device. A plurality of actuators are associated with the brake member and selectively controllable to apply a force to cause the brake member to move into the braking position. A brake controller determines a number of the actuators to activate based on a determined load of the elevator car associated with the brake device.

Provided is an electric winch device including: an electric motor; a winch drum; a brake; an operation lever; and a controller. The controller includes: a first torque derivation unit which derives a value of a first torque applied to the winch drum due to a load of an object; a second torque derivation unit which derives a value of a second torque generated in the winch drum by a drive torque of the electric motor; and a brake control unit which determines a timing for releasing a braking action on the winch drum after the operation lever has been operated, on the basis of a differential between the second torque value and the first torque value, and which causes the brake to release the braking action on the winch drum by transmitting, to the brake, a control signal instructing release of the braking action on the winch drum at the determined timing.

Provided is an electric winch device including: an electric motor; a winch drum; a brake; an operation lever; and a controller. The controller includes: a first torque derivation unit which derives a value of a first torque applied to the winch drum due to a load of an object; a second torque derivation unit which derives a value of a second torque generated in the winch drum by a drive torque of the electric motor; and a brake control unit which determines a timing for releasing a braking action on the winch drum after the operation lever has been operated, on the basis of a differential between the second torque value and the first torque value, and which causes the brake to release the braking action on the winch drum by transmitting, to the brake, a control signal instructing release of the braking action on the winch drum at the determined timing.

An adjustable brake controller of an elevator brake including a DC bus, first terminals for connecting the brake controller to a first magnetizing coil, second terminals for connecting the brake controller to a second magnetizing coil, a first controllable power switch coupled between the first terminals and the DC bus, the first controllable power switch being configured to supply electric power from the DC bus to the first magnetic coil responsive to a first control signal, a second controllable power switch coupled between the second terminals and the DC bus, the second controllable power switch being configured to supply electric power from the DC bus to the second magnetizing coil responsive to a second control signal, and a controller configured to generate the first and the second control signals for controlling the first and second power switches, respectively, with a brake open mode and a brake holding mode.