Ganter Norm Standard Parts - Catalogue Page 793
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Toggle Clamps Knee Lever Principle Pneumatic toggle clamps combine the advantages of clamping with the knee lever principle (clamp remains closed even after a loss of pressure) with the capabilities of pneumatic operation. Movement phase 1 The clamping arm opens wide enough that the full surface of the workpiece is exposed, allowing it to be removed or placed into the mechanism without obstruction. Movement phase 2 Even a slight turning of the clamping lever brings the clamping arm with the spindle assembly onto the workpiece. The arrangement of the three knee joints as shown makes clear that the clamping arm exerts many times the operating force on the lever. However, the toggle clamp is not yet locked in this position; in other words, opposing forces on the clamping arm would open it again. Movement phase 3 When all three joints of the knee lever are in alignment, the maximum clamping force FS is achieved (lever dead point). Movement phase 4 In this position, i.e. the clamping position, the lever dead point is exceeded by a specific amount and the clamping lever is fixed in place by an end stop. This ensures secure locking (self-blocking) of the toggle clamp. The force that can be absorbed by the clamping element in this closed state without lasting deformation is referred to as the retaining force retaining force FH. Page 792 | 2.4 Tensioning with Clamping Mechanisms
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