Elevator
The invention relates to an elevator provided with a safety gear arrangement, the elevator including at least an elevator car arranged to travel back and forth substantially vertically along guide rails, at least two safety gear mechanisms disposed in conjunction with the elevator car and at least one speed limiter, which includes at least a speed limiter pulley, a diverting pulley and a speed limiter rope fitted as a loop around at least the speed limiter pulley and the diverting pulley, the speed limiter rope being connected at least to a first safety gear mechanism. A second safety gear mechanism has been arranged to be triggered after the triggering of the first safety gear mechanism.
1. An elevator provided with a safety gear arrangement, the elevator comprising:
at least an elevator car arranged to travel back and forth substantially vertically along guide rails;
at least two safety gear mechanisms disposed in conjunction with the elevator car; and
at least one speed limiter, which includes:
at least a speed limiter pulley;
a diverting pulley; and
a continuous single speed limiter rope fitted as a loop around at least the speed limiter pulley and the diverting pulley, said speed limiter rope being connected at least to a first safety gear mechanism and a second safety gear mechanism, the second gear mechanism being arranged to be triggered after a triggering of the first safety gear mechanism,
wherein the speed limiter rope is releasably connected to the first safety gear mechanism by means of a first clamping element, and fixedly connected to the second safety gear mechanism by means of a second clamping element, and
wherein a portion of the speed limiter rope which is between the first clamping element of the first safety gear mechanism and the second clamping element of the second safety gear mechanism has been arranged to form a substantially slack link, the length of this slack link being substantially greater than the distance between the first and second clamping elements when a gripping action has been performed by the first safety gear mechanism.
2. The elevator according to claim 1 , further comprising at least actuating means for triggering the second safety gear mechanism after the triggering of the first safety gear mechanism.
3. The elevator according to claim 2 , further comprising a timer for triggering the second safety gear mechanism, by means of which timer the second safety gear mechanism has been arranged to be triggered upon the lapse of a predetermined time delay after the triggering of the first safety gear mechanism.
4. The elevator according to claim 2 , further comprising an actuating means for triggering the second safety gear mechanism, the actuating means including a pulse transducer adapted to monitor the deceleration of the elevator car, the second safety gear mechanism being arranged to be triggered by the actuating means if the deceleration of the elevator car effected by the first safety gear mechanism does not exceed a predetermined limit value.
5. The elevator according to claim 2 , wherein the speed limiter rope is releasably connected to the first safety gear mechanism by means of a clamping element, and fixedly connected to the second safety gear mechanism by means of a clamping element.
6. The elevator according to claim 1 , further comprising a timer for triggering the second safety gear mechanism, by means of which timer the second safety gear mechanism has been arranged to be triggered upon the lapse of a predetermined time delay after the triggering of the first safety gear mechanism.
7. The elevator according to claim 1 , further comprising an actuating means for triggering the second safety gear mechanism, the actuating mean including an acceleration sensor adapted to monitor the deceleration of the elevator car, the second safety gear mechanism being arranged to be triggered by the actuating means if the deceleration of the elevator car effected by the first safety gear mechanism does not exceed a predetermined limit value.
8. The elevator according to claim 1 , further comprising an actuating means for triggering the second safety gear mechanism, the actuating means including a pulse transducer adapted to monitor the deceleration of the elevator car, the second safety gear mechanism being arranged to be triggered by the actuating means if the deceleration of the elevator car effected by the first safety gear mechanism does not exceed a predetermined limit value.
9. The elevator according to claim 1 , further comprising a timer connected to the first clamping element of the first safety gear mechanism, the said timer being arranged to be activated when the first safety gear mechanism is triggered and to release the holding grip of the first clamping element on the speed limiter rope upon the lapse of a period of time set on the timer.
10. The elevator according to claim 1 , further comprising an actuating means for releasing the holding grip of the first clamping element on the speed limiter rope if the deceleration of the elevator car is below a pre-set limit value, the actuating means including an acceleration sensor or a pulse transducer connected to the first clamping element of the first safety gear mechanism, the said acceleration sensor or pulse transducer being arranged to monitor the deceleration of the elevator car at least after the first safety gear mechanism has been triggered.
11. The elevator according to claim 1 , wherein the second safety gear mechanism has been arranged to be triggered after the speed of the elevator car has begun to slow down.
12. The elevator according to claim 1 , wherein the second safety gear mechanism has been arranged to be triggered at a speed that is equal to or lower than the speed at which the first safety gear mechanism has been arranged to be triggered.
13. The elevator according to claim 1 , wherein the pulling effect of the speed limiter rope has been arranged to be transmitted to the second safety gear mechanism only after the first safety gear mechanism has been triggered.