A centrifugal brake mechanism for a controlled descent device, and a drum device employing it, are described. The mechanism comprises a circular wheel configured and operable to rotate about an axis of rotation thereof, an axle extending along and rotatable about the axis inside a central cavity of the wheel and having two or more parallel shaft rods extending inside the cavity substantially perpendicular to the axis of rotation, a gear system for transferring rotations of the wheel into counter-rotations of the axle, one or more brake elements each having pass-through bores for slidably mounting over the two or more parallel shaft rods, springs mounted over the parallel shaft rods between the brake element and the axle, and a friction enhancement mechanism for increasing friction forces between the brake elements and the inner wall the wheel responsive to increase in angular velocity of the wheel.

A centrifugal brake mechanism for a controlled descent device, and a drum device employing it, are described. The mechanism comprises a circular wheel configured and operable to rotate about an axis of rotation thereof, an axle extending along and rotatable about the axis inside a central cavity of the wheel and having two or more parallel shaft rods extending inside the cavity substantially perpendicular to the axis of rotation, a gear system for transferring rotations of the wheel into counter-rotations of the axle, one or more brake elements each having pass-through bores for slidably mounting over the two or more parallel shaft rods, springs mounted over the parallel shaft rods between the brake element and the axle, and a friction enhancement mechanism for increasing friction forces between the brake elements and the inner wall the wheel responsive to increase in angular velocity of the wheel.

A method includes a first brake block of a first brake rubber, a second brake block mounted with a second brake rubber and a mounting base for mounting the first and second brake blocks. The second brake rubber is movable along a direction slanted with respect to an axis of rotation of the traction sheave. A brake block actuation member is triggered by the brake blocks to enable the first and the second brake rubbers to hold the traction sheave. A switching member is also triggered by the action of the second brake rubber, cutting off a safety circuit of the elevator. The external power is cut off, and the brake block actuation member enables contact between the second brake rubber and the traction sheave. The traction sheave further drives the second brake rubber triggering the brake block members to generate frictional braking force to stop the traction sheave.

A method includes a first brake block of a first brake rubber, a second brake block mounted with a second brake rubber and a mounting base for mounting the first and second brake blocks. The second brake rubber is movable along a direction slanted with respect to an axis of rotation of the traction sheave. A brake block actuation member is triggered by the brake blocks to enable the first and the second brake rubbers to hold the traction sheave. A switching member is also triggered by the action of the second brake rubber, cutting off a safety circuit of the elevator. The external power is cut off, and the brake block actuation member enables contact between the second brake rubber and the traction sheave. The traction sheave further drives the second brake rubber triggering the brake block members to generate frictional braking force to stop the traction sheave.

A traction sheave safety device and elevator car emergency stop method includes a first brake block of a first brake rubber, a second brake block mounted with a second brake rubber and a mounting base for mounting the first and second brake blocks. It uses a first and the second brake rubbers disposed on the two sides of the traction sheave. The second brake rubber is movable along a direction slanted with respect to an axis of rotation of the traction sheave. A brake block actuation member is triggered by the brake blocks to enable the first and the second brake rubbers to hold the traction sheave. A switching member is also triggered by the action of the second brake rubber, for cutting off a safety circuit of the elevator when the elevator car is in abnormal operation. When abnormal operation of the elevator car is detected by the elevator system, the external power is cut off, the brake block actuation member enables contact between the second brake rubber and the traction sheave to generate a normal pressure. The traction sheave continues to rotate and drives the second brake rubber triggering the brake block members to generate enough frictional braking force to stop the traction sheave. The switching member is triggered upon the movement of the second brake rubber, and cuts off the safety circuit of the elevator. The safety device is kept at an emergency braking state until the braking state is manually released. The frictional braking force generated by the device can be automatically regulated according to the rotating speed of the traction sheave. Thus, injuring accidents caused by excessive deceleration in an emergency braking are avoided, and the entire device has an excellent overall performance.

A traction sheave safety device and elevator car emergency stop method includes a first brake block of a first brake rubber, a second brake block mounted with a second brake rubber and a mounting base for mounting the first and second brake blocks. It uses a first and the second brake rubbers disposed on the two sides of the traction sheave. The second brake rubber is movable along a direction slanted with respect to an axis of rotation of the traction sheave. A brake block actuation member is triggered by the brake blocks to enable the first and the second brake rubbers to hold the traction sheave. A switching member is also triggered by the action of the second brake rubber, for cutting off a safety circuit of the elevator when the elevator car is in abnormal operation. When abnormal operation of the elevator car is detected by the elevator system, the external power is cut off, the brake block actuation member enables contact between the second brake rubber and the traction sheave to generate a normal pressure. The traction sheave continues to rotate and drives the second brake rubber triggering the brake block members to generate enough frictional braking force to stop the traction sheave. The switching member is triggered upon the movement of the second brake rubber, and cuts off the safety circuit of the elevator. The safety device is kept at an emergency braking state until the braking state is manually released. The frictional braking force generated by the device can be automatically regulated according to the rotating speed of the traction sheave. Thus, injuring accidents caused by excessive deceleration in an emergency braking are avoided, and the entire device has an excellent overall performance.

A centrifugal brake mechanism for a controlled descent device, and a drum device employing it, are described. The mechanism comprises a circular wheel configured and operable to rotate about an axis of rotation thereof, an axle extending along and rotatable about the axis inside a central cavity of the wheel and having two or more parallel shaft rods extending inside the cavity substantially perpendicular to the axis of rotation, a gear system for transferring rotations of the wheel into counter-rotations of the axle, one or more brake elements each having pass-through bores for slidably mounting over the two or more parallel shaft rods, springs mounted over the parallel shaft rods between the brake element and the axle, and a friction enhancement mechanism for increasing friction forces between the brake elements and the inner wall the wheel responsive to increase in angular velocity of the wheel.

A centrifugal brake mechanism for a controlled descent device, and a drum device employing it, are described. The mechanism comprises a circular wheel configured and operable to rotate about an axis of rotation thereof, an axle extending along and rotatable about the axis inside a central cavity of the wheel and having two or more parallel shaft rods extending inside the cavity substantially perpendicular to the axis of rotation, a gear system for transferring rotations of the wheel into counter-rotations of the axle, one or more brake elements each having pass-through bores for slidably mounting over the two or more parallel shaft rods, springs mounted over the parallel shaft rods between the brake element and the axle, and a friction enhancement mechanism for increasing friction forces between the brake elements and the inner wall the wheel responsive to increase in angular velocity of the wheel.

In an aspect, a remote-controlled brake for a human-powered vehicle is provided and includes a support structure that is mountable to a frame of the vehicle, a shoe that is pivotable between a braking position and a non-braking position, a motor, and a local controller. In the braking position the shoe is abutted with a wheel of the vehicle to stop forward rolling of the wheel, while permitting backward rolling of the vehicle. In the non-braking position the shoe permits forward and backward rolling of the wheel. The motor is operatively connected to the shoe to move the shoe to and from both the braking and non-braking position. The local controller includes an electronic reception unit that is configured to receive signals from a remote controller, wherein the local controller is programmed to control operation of the motor based on the signals.