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1
GENERAL INFORMATION BEFORE BEGINNING THE ASSEMBLY
1.1
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 overspeed governor (fig. 1, 2, 3) is made up of:
- a wheel (1) with trapezoidal undercut groove (to house the overspeed governor rope) fitted with test groove
for operation tests;
- 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
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.
The pendulum, firred with a idle rubben wheel (7), 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 to, 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.
Fig. 1 Overspeed governor type R3
Fig. 3 Overspeed governor type R6
8
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:
• R3 AGB 083/3
• R5 AGB 064/5
• R6 AGB 065/6
Fig. 2 Overspeed governor type R5
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