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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, eventually present, acting upwards, more precisely the safety gear 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 a pulley with:
• governor wheel (1) with trapezoidal undercut groove, to house the overspeed governor rope;
• test groove for operation test;
• cam rim;
• eccentric stop.
The rope, secured to the clamp of the safety gear and stretched by a weight, operates the governor wheel
through the pressure of the rope 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
Should the assembly be carried out in the elevator shaft, the overspeed governor must be
supplied with remote control or it must be easily accessible from the outside (e.g. through a
maintenance door).
By means of a key, the remote control (fig. 2, pos. 11) causes the insertion of the pendulum on the electro-
magnetic way in the safety switch box.
Overspeed governors fitted with remote control make the operation controls easy.
Overspeed governors are provided with the homologation according to the rules and regulations for elevators
95/16/CE, with the following EC-type-approval test numbers:
• LK 200 AGB 182
• LK 250 AGB 183
• LK 300 AGB 184
• LK 315 AGB 186
•
LK 200/T AGB 209
6
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 becomes so
extended, that the oscillating dog clutch (8) meets the peripheral guide
of the eccentric stop, where it is clamped by a cam.
A steel pin (10) applied on the pendulum operates the safety switch (9)
before the mechanical clamping of the pendulum. Through it, the con-
trol power of the plant is switched off.
The overspeed governors can also be delivered with remote control.
Fig. 2
Overspeed governor with remote control
GB
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