Abstract:
A lift drive (20) serves to drive and to detain a lift car, and it essentially contains a traction wheel (22) for transmitting a driving or detaining force to the lift car, a motor (21) for driving the traction wheel (22), and a braking arrangement for detaining the traction wheel (22). A drive shaft (2) connects the traction wheel, the motor and the braking arrangement to one another. The braking arrangement contains at least two braking devices (24.1, 24.2), wherein, according to the invention, the traction wheel (22) is arranged between the braking devices (24.1, 24.2). This is advantageous, since the braking torques (MB1,2) which are transmitted by the traction wheel (22) to the braking devices (24.1, 24.2) are divided. In the case of an advantageous, symmetrical division of the braking devices (24.1, 24.2), half on either side of the traction wheel, a torque which is to be transmitted is reduced by half in the drive shaft (2). A risk of failure or risk of breakage of the drive shaft (2) is thereby significantly reduced. In addition, during a possible failure of the drive shaft (2), there continues to be a braking function, since the braking devices (24.1, 24.2) are distributed on both sides of the traction wheel (22).
Abstract:
A termination for fastening a flat belt-type carrier means (2) of an elevator system comprises a housing having two sidewalls (1.1, 1.2) and a first and a second wrap-around element (3, 4) that extends between the respective sidewalls and around which the flat belt-type carrier means can wrap in a predetermined arrangement to frictionally immobilize the carrier means on the termination. The invention is characterized in that the predetermined arrangement of the carrier means is marked on at least one of the sidewalls on the exterior facing away from the wrap-around elements.
Abstract:
The fixed point (14) arranged on a guiding track (5) substantially comprises a carriage (19) that can be moved along the guiding track (5). The carriage is guided along the free leg (5.2) of the guiding track (5) by means of guide shoes (22) and carries a yoke (23). A console (24) is arranged on the guiding track (5), a damping element (25) being supported on said console. The end (10) of a belt (11) is held by means of a connecting element (26), said connecting element in turn being attached to the yoke (23) by means of a tension rod (27) and nuts (28). In case of an emergency stop, during which the brake of the drive unit slows down the elevator cabin until standstill, the occurring deceleration forces are transferred to the yoke (23) by means of the belt (11), connecting element (26) and tension rod (27). The deceleration forces effect a downward displacement of the carriage (19) into the suspension position against the damping capacity of the damping element (26).
Abstract:
The invention relates to dispersingly acting compositions as flow agents in the form of flowing screeds and putties for building material mixtures containing calcium sulfates, wherein said compositions comprise a copolymer in the form of a polycarboxylate ether and wherein the copolymer is free of dicarbolic acids as comonomer components. Dispersing agents can be used in an amount ranging from 0.002 to 1.0% by weight and thus provide the end products with a significantly improved early strength, wherein layer thicknesses of up to 10 cm can be achieved in the flooring area.
Abstract:
An elevator system with a car or platform to transport passengers and/or goods as well as with a counterweight, which are arranged as traversable or movable along a travel path, and which are coupled and/or with a drive by a suspension element interrelating their motion. The suspension element is guided and/or driven by a traction sheave and/or a drive shaft and/or a deflecting pulley. The suspension element is sheathed and/or belt-type, with a first layer made of a first plasticizable and/or elastomeric material, containing a first exterior surface, and with at least one tension member—rope-type, tissue-type, or comprising a multitude of partial elements—that is embedded in the first layer of the suspension element. A manufacturing procedure for one of the suspension elements is provided.