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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 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, 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 pulley with:
• governor wheel (1) with trapezoidal undercut groove, to house the overspeed governor rope;
• test grooves for operation tests;
• cam rim (2);
• eccentric stop (3).
The rope, secured to the clamp of the safety gear and stretched by a weight, operates the governor wheel (1)
through the pressure of the rope in the trapezoidal undercut groove.
Beside the trapezoidal groove, a cam rim (2) with eccentric stop (3) is also mounted on the governor wheel.
6
7
4
3
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.8) causes the insertion of the pendulum on the
electromagnetic 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
2014/33/EU, with the following EU-type-approval test numbers:
• LK 120 : TÜV EU-OG 280
• LX 150 : TÜV EU-OG 295/1
• LX 180 : TÜV EU-OG 296
• LK 200 : TÜV EU-OG 182
• LK 250 : TÜV EU-OG 183
• LK 300 : TÜV EU-OG 184
• LK 315 : TÜV EU-OG 186
8
Fig. 2
Overspeed
governor
with remote
control
8
Such rim allows the pendulum (4) to operate with an upward/downward
oscillating motion, by means of a pulley mounted on a ball bearing.
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
5
extended, that the oscillating dog clutch (5) meets the peripheral guide of
the eccentric stop, where it is clamped by a cam.
2
A steel pin (6) applied on the pendulum operates the safety switch (7)
before the mechanical clamping of the pendulum. Through it, the control
power of the plant is switched off.
1
The overspeed governors can also be delivered with remote control.
Fig. 3
Overspeed governor
with uncontrolled car
movement device
On the use in new
facilities in accordance
with the requirements of
European standard for
the uncontrolled
movement of the cab, the
overspeed governor can
be supplied complete
with a solenoid device in
combination with its
feeder or without; for the
operation and the use of
the above devices please
refer to the specific
maintenance manual
provided separately.
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