A window balance system includes a U-shaped channel with a first end and an opposite second end, and a balance element supported within the U-shaped channel. The balance element includes a fixed pulley block coupled to the first end of the U-shaped channel, a movable pulley block movably disposed in the U-shaped channel, and a cord extending between the fixed pulley block and the moveable pulley block. The window balance system includes a locking device coupled to the fixed pulley block and configured to engage with the cord and lock a position of the fixed pulley block with respect to the cord. The window balance system also includes a shoe coupled to the second end of the U-shaped channel. The shoe includes an elongate portion and an enlarged portion such that the shoe is substantially T-shaped, and a chamber configured to receive at least a portion of a pivot bar.

A window balance system includes a U-shaped channel with a first end and an opposite second end, and a balance element supported within the U-shaped channel. The balance element includes a fixed pulley block coupled to the first end of the U-shaped channel, a movable pulley block movably disposed in the U-shaped channel, and a cord extending between the fixed pulley block and the movable pulley block. The window balance system includes a locking device coupled to the fixed pulley block and configured to engage with the cord and lock a position of the fixed pulley block with respect to the cord. The window balance system also includes a shoe coupled to the second end of the U-shaped channel. The shoe includes an elongate portion and an enlarged portion such that the shoe is substantially T-shaped, and a chamber configured to receive at least a portion of a pivot bar.

A counterbalance hinge assembly includes a cam and compression device that counterbalances a weight of a door or a ramp. The compression device biases against a rotation of the door or ramp. The downward movement of the door or ramp drives cam followers in angled slots or cam surfaces of the cam. The angled slots or cam surfaces include varying angles of incline to correspond to varying torque forces of the door or ramp during the opening or closing movement of the door or ramp.

The present invention is concerned with vertically sliding facade components. In order to improve operability and user comfort for vertically displaceable facade components, a weight compensation device (10) for vertically displaceable facade components comprises a spring element (12) for at least partial compensation of its own weight of a vertically displaceable facade component and a compensator (14). The spring element provides a spring force as a driving force (F.sub.AN) for lifting the vertically displaceable facade component. The spring element is movable between a compressed state (P.sub.K) and an expanded state (P.sub.E). The spring force has a decreasing value when moving from the compressed state to the expanded state. The compensator at least partially compensates for the decrease in the input force and provides an output force (F.sub.AB) that decreases less than the input force.

A spring-loaded hinge assembly including a hinge support bracket and a leaf that is pivotally mounted to the hinge support bracket. A coil spring is supported on a spring support member, which includes a pivot bush. The coil spring applies a biasing force to the spring support member, which operates to push the pivot bush against a cam on the leaf. A lock configured to rotate between locked and unlocked positions includes a finger that engages an engagement feature on the hinge support bracket when the lock rotates to the locked position as the leaf swings toward the open position. In the locked position, the lock holds the coil spring in a partially compressed, pre-load condition and the pivot bush at a partially retracted position relative to the cam until the lock is subsequently released by contact between the cam and the pivot bush during subsequent closure.

A window balance system includes a U-shaped channel with a first end and an opposite second end, and a balance element supported within the U-shaped channel. The balance element includes a fixed pulley block coupled to the first end of the U-shaped channel, a movable pulley block movably disposed in the U-shaped channel, and a cord extending between the fixed pulley block and the moveable pulley block. The window balance system includes a locking device coupled to the fixed pulley block and configured to engage with the cord and lock a position of the fixed pulley block with respect to the cord. The window balance system also includes a shoe coupled to the second end of the U-shaped channel. The shoe includes an elongate portion and an enlarged portion such that the shoe is substantially T-shaped, and a chamber configured to receive at least a portion of a pivot bar.

The invention relates to a weight compensation device for a drive of a lifting door, for the position-dependent compensation of the weight force of a door leaf of the lifting door, with a force transmission unit which can be coupled to the drive in order to carry out an opening movement which raises the door leaf and a closing movement which lowers the door leaf, wherein at least one compression spring is provided which is arranged in such a way that it supports the opening movement. The invention also relates to a lifting door, in particular an industrial lifting door, which has a door leaf, with a drive, such as a motor, and with a weight compensation device according to the invention.

A spring-loaded hinge assembly including a hinge support bracket and a leaf that is pivotally mounted to the hinge support bracket. A coil spring is supported on a spring support member, which includes a pivot bush. The coil spring applies a biasing force to the spring support member, which operates to push the pivot bush against a cam on the leaf. A lock configured to rotate between locked and unlocked positions includes a finger that engages an engagement feature on the hinge support bracket when the lock rotates to the locked position as the leaf swings toward the open position. In the locked position, the lock holds the coil spring in a partially compressed, pre-load condition and the pivot bush at a partially retracted position relative to the cam until the lock is subsequently released by contact between the cam and the pivot bush during subsequent closure.

The invention relates to a weight compensation device for a drive of a lifting door, for the position-dependent compensation of the weight force of a door leaf of the lifting door, with a force transmission unit which can be coupled to the drive in order to carry out an opening movement which raises the door leaf and a closing movement which lowers the door leaf, wherein at least one compression spring is provided which is arranged in such a way that it supports the opening movement. The invention also relates to a lifting door, in particular an industrial lifting door, which has a door leaf, with a drive, such as a motor, and with a weight compensation device according to the invention.

The invention relates to a weight compensation device for a drive of a lifting door, for the position-dependent compensation of the weight force of a door leaf of the lifting door, with a force transmission unit which can be coupled to the drive in order to carry out an opening movement which raises the door leaf and a closing movement which lowers the door leaf, wherein at least one compression spring is provided which is arranged in such a way that it supports the opening movement. The invention also relates to a lifting door, in particular an industrial lifting door, which has a door leaf, with a drive, such as a motor, and with a weight compensation device according to the invention.