Tolerance sleeves in use
Rise high, fall gently
At Motek, Dr. Tretter will be exhibiting versatile tolerance sleeves. They can be seen in a special application: as shock absorbers in fall protection systems that soften the impact on people in the event of a fall.
Industrial climbers in particular, but also roofers and net fitters, generally carry out their work at heights from which they want to return safely to solid ground. To do this, they use systems consisting of a rope, carabiner and harness. A so-called shock absorber is used between the rope and harness to significantly reduce the impact on the user's body in the event of a fall. In principle, this is constructed like an automatic harness: Once the harness reaches a certain extension speed, the pulley is blocked.
Dr. Tretter will be exhibiting this energy absorber at Motek. Its special feature is a tolerance sleeve, also known as a tolerance ring, which is installed in the gap between the belt pulley and the brake. A tolerance ring is a slotted sheet metal sleeve made of spring band steel, in which beads are embossed like wave crests. These are distributed around the entire circumference and act like many small compression springs. A friction-locked connection between the shaft and hub is created by pretensioned installation. The tolerance sleeve in the energy absorber enables controlled slippage between the belt pulley and the brake in the event of a fall. It acts like a slipping clutch as overload protection. The advantage is: In the event of a fall, only the tolerance sleeve and connecting parts need to be replaced. The rope can be reused.
Dr. Tretter will also be showcasing its ball screw drives in Stuttgart. These consist of a spindle, a nut with the balls and the bearing. With a high degree of efficiency, they convert the rotation of a motor into a linear movement. This is why these components are used as drive elements for all types of linear guides. The steel housing for DIN ball screw nuts (form B) is new. This serves as a connecting element between the drive and the guide. This allows the user to mount the ball screw drive easily and accurately. as
Hall 6, Stand 6106
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