General Information Before Beginning The Assembly; Description, Operation Mode - PFB R1 Notice D'utilisation Et D'entretien

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GENERAL INFORMATION BEFORE BEGINNING THE ASSEMBLY

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DESCRIPTION, OPERATION MODE

The overspeed governor is a safety device which turns on when the allowed speed of the elevator car is excee-
ded.
If the elevator car, during its upward/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 same overspeed governor (fig. 1) is made up of pulley with:
- governor wheel (1) with trapezoidal undercut groove to house the overspeed governor rope
- test grooves for operation tests (2)
- cam rim (3);
- eccentric stop (4).
The rope, secured to the clamp of the safety gear and stretched by a weight, operates the governor wheel (1)
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 pul-
ley mounted on a ball bearing.
Fig. 1
Overspeed governor
The pendulum is drawn to the cam rim by a preloaded tension spring, corresponding to the scheduled tripping
speed.
By reaching the tripping speed, the swing of the pendulum on the cam becomes so extended, that the oscilla-
ting dog clutch (8) meets the peripheral guide of the eccentric stop, where it is clamped.
A plate (5) applied on the pendulum operates the safety switch (9) before the mechanical clamping of the pen-
dulum. Through it, the control power of the plant is switched off.
The overspeed governor is provided with the omologation according to the rules and regulations for elevators
95/16/CE, with the following EC-type-approval test number:
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TYPE R1: AGB 082/3
TYPE R1X: AGB 207