Revolution speed adjuster for fireplace exhauster, has two electrical contacts corresponding to end positions of sliding unit, and turning knob rotated from off-position in direction of maximum/minimum revolution speed

摘要

The adjuster has a toroid coil (2) wound around a adjuster body (1) and including a peripheral sliding region extending between two electrical contacts (11, 12). The two contacts correspond to the end positions of a sliding unit (7) and define an off-position of the adjuster. A turning knob at a shaft is rotated from the off-position in the direction of a maximum or minimum revolution speed.