Abstract: In such an arrangement a faultless clamping of the rope in the traction sheave is necessary. For that purpose two-piece traction sheaves are known whose sheave halves can be pressed together. Further, seat grooves are known wherein the ropes are radially pressed down into the seat grooves. In the so-called V-shaped grooves clamping of the ropes takes place by means of counterweights at the unloaded rope ends. Disadvantages of the known types of construction are unnecessary loads, considerable wear, high weights, bulky arrangements and poor efficiency. For doing away with these disadvantages, two sheaves halves 7, 14 are now mounted parallel to one another and are provided with a common peripheral V-shaped groove. The sheave halves 7, 14 are spring-loaded pressed together and at the periphery of the V-shaped rope groove, rope-supporting elements 20 are fixedly mounted. Thereby a simple construction is achieved, safety has increased and the operation is simplified by requiring no maintenance.

Abstract: The mechanism comprises at least one driving pulley comprising of two parts which are each provided with one part of a cable groove, which groove has a relatively great output transmission capacity. The parts are pressed toward each other by pressing devices, which comprise spiral springs or leaf springs which rest on and are coupled for rotation with the driving pulley parts. Each driving pulley may cooperate with another (identical or conventional) driving pulley which rotates at the same speed, e.g., by means of two gears mounted on the peripheral edges of the driving pulleys.

Abstract: A driving pulley mechanism comprises at least one driving pulley consisting of two parts which are provided each with one part of a cable groove having a relatively great capacity of output transmission and are pressed toward each other by pressing devices.Each pressing device comprises a spiral spring or consists of a single or multiple leaf spring and is coupled for rotation with the driving pulley parts, on both of which it rests directly or indirectly.The driving pulley may cooperate with another (identical or conventional) driving pulley which rotates at the same speed e.g. by means of two gears mounted on the peripheral edges of the driving pulleys.