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The overspeed governor R12 (fig. 2) is made up of:
- A wheel (1) with trapezoidal undercut groove (to house the over speed governor rope)
- Two eccentrics (4), connected by a tension spring, acting according to centrifugal force.
- A rope locking system through opposed grip cheeks (10).
The rope, secured to the clamp of the safety gear and stretched by a weight, operates the governor wheel
through its own pressure in the trapezoidal undercut groove.
Beside the trapezoidal groove, a cam rim (3) with eccentric stop (4) is also mounted on the governor wheel.
Such rim allows the pendulum (6) to operate with an upward/downward oscillating motion, by means of a
pulley mounted on a ball bearing.
The preloaded and suitably sized tension spring (8) enables the operation of the pre engaged release lever
(11) by the two eccentrics (moved towards the outer side of the pulley by the centrifugal force), but only after
having reached the tripping speed; the release lever (11) in turn leaves one of the two opposed cheeks (10)
fall, thus causing the locking of the rope that slides on the governor. The release lever operates
contemporaneously the safety switch (9) thus cutting off the plant current.
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• The overspeed governors R12BF are provided with the homologation according to the rules and regulations
for elevators 2014/33/EU, with the following IMQ-type-approval test number: CA 50.00723
Fig. 2 Overspeed governor type R12BF
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