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1.1 DESCRIPTION, OPERATION MODE
The overspeed governor is a safety device which turns on when the allowed speed of the elevator car is
exceeded.
If the elevator car, during its downward run, exceeds its nominal permissible speed, (until the tripping speed is
reached), the overspeed governor turns on and, in turn, releases – on the overspeed governor rope – a brake
mechanism, called safety gear, which is located on the elevator car. The elevator car stops and is kept back
by the guides.
The overspeed governor R10BF (fig. 1) is made up of:
- a wheel (1) with trapezoidal undercut groove (to house the overspeed governor rope);
- cam rim (3);
- eccentric stop (4).
- a rope locking system trough 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 pendulum, fitted with a idle ribber wheel, is drawn to the cam rim by a preloaded tension spring (8),
corresponding to the scheduled tripping speed.
By reaching the tripping speed, the swing of the pendulum on the cam becomes so extended that the tooth it
is fitted with, meets the peripheral guide of the eccentric stop, where it is clamped.
A steel pin (5) applied on the pendulum operates the safety switch (9) before the mechanical clamping of the
pendulum. Through it, the control power of the plant is switched off.
At the same time the pendulum is mechanically locked, also the rope is locked trough suitable grip
Cheeks (10). The rope locking is caused by the operation of a pendulum and of a pre engaged lever (11).
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• The overspeed governor R10BF is provided with homologation according to the rules and regulations for
elevators 2014/33/EU, with the following EU-type-approval test number: TÜV EU-OG 282
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Fig. 1 Overspeed governor type R10BF
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