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 truck mounted braking system is provided with a mechanical pivot adjustment on the bake lever connected to the brake cylinder push rod to permit the braking force applied to the wheels to vary depending on the lading condition of the car, without involving additional pneumatic elements such as a pneumatic empty load device. The brake cylinder may be provided with a channel which permits the push rod to achieve different positions based on different positions of the brake cylinder push rod.

A vehicle includes a rotationally movable actuating element and a sensor arrangement for measuring an actuating angle of the actuating element. The sensor arrangement has a measuring acceleration sensor which is fastened to the actuating element, and a reference acceleration sensor which is fastened immovably to the vehicle. A method for measuring the actuating angle of a rotationally movable actuating element in a vehicle, a measuring arrangement configured to carry out a method for measuring, a computer program product and a provision apparatus for the computer program product, are also provided.

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.

The present invention is implemented by a gantry binary synchronization block-type brake, which comprises: a gantry bracket comprised by a fixedly connected door-shaped frame; braking arms arranged on both sides of the gantry bracket with lower ends of the braking arms hinged to the gantry bracket; braking shoes connected to the braking arms for frictionally braking a braking wheel; a dual brake releaser secured to the gantry bracket for pushing the two braking arms outward synchronously; braking springs provided on the gantry bracket for pushing the braking arms so as to perform normal-mode braking; and a gap adjustment mechanism for adjusting a working gap between the braking shoes and the braking wheel. According to the present invention, the security risks in an elevator tractor or crane can be eliminated, the gap adjustment approach is simple, and reliability and versatility of an operation are considerably enhanced.

A brake device for a drivable part, in particular for use for a vehicle flap, in particular in an automobile, includes a drivable load device (11) which can be radially brought into contact with a disc (90) of the drivable part, with a first holding position and a second release position. At least one brake element rests against the periphery (92) of the disc (90) in a frictional manner in the holding position and secures the disc (90) from rotating using a specifiable force. In the release position, the at least one brake element is arranged at a distance from the periphery of the disc (90) and allows a free run of the disc (90), and the load device (11) can be adjusted between the holding position and the release position, preferably by a motor (12). A brake device or a rotating drive with which a drivable part of the drive is secured against a displacement on the basis of the mass of the component to be displaced even when the motor is not being provided with power or is deactivated is achieved in that the first holding position and the second release position are each designed as a metastable holding position.

A brake device for a drivable part, in particular for use for a vehicle flap, in particular in an automobile, includes a drivable load device (11) which can be radially brought into contact with a disc (90) of the drivable part, with a first holding position and a second release position. At least one brake element rests against the periphery (92) of the disc (90) in a frictional manner in the holding position and secures the disc (90) from rotating using a specifiable force. In the release position, the at least one brake element is arranged at a distance from the periphery of the disc (90) and allows a free run of the disc (90), and the load device (11) can be adjusted between the holding position and the release position, preferably by a motor (12). A brake device or a rotating drive with which a drivable part of the drive is secured against a displacement on the basis of the mass of the component to be displaced even when the motor is not being provided with power or is deactivated is achieved in that the first holding position and the second release position are each designed as a metastable holding position.

A friction element having a friction layer or block made at least in part of a compounded friction material having a homogenous fibrous microstructure, in which the fibrous aspect of the homogenous microstructure appears to be lost up to a magnification of 100. The friction material is obtained with a mixing step including a first step of hot blending of at least part of the organic binder with at least part of the other components of the friction material by a rolling mill blender that is open to atmospheric pressure at a temperature lower than the polymerization temperature of the organic binder but greater than or equal to its softening temperature, in order to obtain a semifinished solid product. A second step of grinding the semifinished solid product reduces the product to a powder.