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(11) | EP 2 020 397 A1 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Apparatus and system for detecting elevator car overspeed |
(57) The invention relates to an apparatus and system for detecting overspeed of elevator
components such as a car or a counterweight having: a wheel, with an auxiliary surface
or auxiliary wheel (100), configured to run on a first surface (210) of a travel rail
(200) of the elevator component; an actuating device for actuating a braking mechanism
of the elevator component; a speed detection device for generating a synchronized
alternating movement with the speed of the elevator component; the speed detection
device being configured to not generate the synchronized alternating movement when
a predetermined speed of the elevator component is exceeded and to thus activate the
actuating device (300). In the system of the invention, the apparatus can be arranged
in an upper or lower part of the elevator component. In the first case, the transmission
device has a plurality of levers (910); in the second case, it has pinions (920) and
chains.
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Field of the Invention
Background of the Invention
Description of the Invention
a wheel, with an auxiliary surface configured to run on a first surface of a travel rail of the elevator component;
actuating means for actuating a braking mechanism of the elevator component characterized in that it comprises:
speed detecting means for generating a synchronized alternating movement with the speed of the elevator component;
the speed detecting means being configured to not generate the synchronized alternating movement when a predetermined speed of the car or the counterweight is exceeded and to thus activate the actuating means.
a polygonal-shaped cam in a side of the wheel, integral with said wheel;
a ratchet wheel in the same side of the wheel and also integral with said wheel, said ratchet wheel comprising a plurality of projections;
a rocker having a first end and a second end, provided with:
a follower at the first end for following the cam profile;
a ratchet at the second end for locking the ratchet wheel, thus locking the entire wheel.
Offsetting a stress exerted by the auxiliary wheel on the rail for preventing transmission of a reaction force on the elevator component;
Setting a pressure between the auxiliary wheel and the rail.
Brief Description of the Drawings
Figure 1 is a sectional plan view showing the apparatus of the invention and its arrangement as regards a rail of an elevator. Said Figure shows the wheel (100), the polygonal cam (110), the ratchet wheel (120), the lock washers (400), the rail (200), the roller (600) and the position of the encoder (500), which is located inside the apparatus.
Figure 2 shows a perspective view of the wheel, where the auxiliary surface of the wheel or auxiliary wheel (100), the polygonal cam (110) and the ratchet wheel (120) can be seen.
Figure 3 shows a perspective view of some components of the ratchet mechanism, such as the rocker (130), the follower (140), the ratchet (150) and the actuation of the braking system (300).
Figures 4A and 4B show two front and rear elevational views, respectively, where the rollers (600), the lock washers (400), the auxiliary wheel (100), the follower (140), the rocker (130), the position of the rail (200), the actuation (300), the coil (800) and the contacts (700) can be seen, said contacts being in charge of detecting the derailment and the variation in the pressure setting of the auxiliary wheel on the rail.
Figure 5A shows a first configuration of the apparatus of the invention where the transmission means comprise a first pinion (310) and second pinion (920) actuating assembly, intended to transmit movement to the braking system by means of a chain or the like encircling the pinion.
Figure 5B shows a second configuration of the invention where the transmission means comprise a levering actuation (320) and a plurality of levers (910) transmitting movement to the braking system.
Description of a Preferred Embodiment of the Invention
A wheel, with an auxiliary surface (100) configured to run on a first surface (210) of a travel rail (200) of the elevator component;
Actuating means (300) for actuating a braking mechanism of the elevator component, characterized in that it comprises speed detecting means for generating a synchronized alternating movement with the speed of the elevator component;
A polygonal-shaped cam (110) on a side of the wheel (100), integral therewith.
A ratchet wheel (120) on the same side of the wheel (100) and also integral therewith, said ratchet wheel (120) comprising a plurality of projections;
A rocker (130) having a first end and a second end, provided with:
A follower (140) at the first end for following the cam profile (110);
A ratchet (150) at the second end for locking the ratchet wheel (120), thus locking the entire wheel (100).
Positioning means, formed by lock washers (400) for pushing the auxiliary surface of the wheel (100) against the first surface (210) of the rail (200) and attempting to prevent the sliding of said auxiliary surface of the wheel on the rail;
Means of detecting the derailment and the variation in a pressure setting of the auxiliary surface of the wheel (100) on the rail (200).
Offsetting a stress exerted by the auxiliary wheel (100) on the rail (200) for preventing a transmission of a reaction force on the elevator component;
Setting a pressure between the auxiliary wheel (100) and the rail (200).
The apparatus is arranged in an upper part of the elevator component and the transmission means comprise a plurality of levers (910).
The apparatus is arranged in a lower part of the elevator component and the transmission means comprise a first pinion (310) and second pinion (920) actuating assembly, which is intended to transmit movement to the braking system by means of a chain or the like encircling it.
an auxiliary wheel (100) configured to run on a first surface (210) of a travel rail (200) of the elevator component;
actuating means (300) for actuating a braking mechanism of the elevator component;
characterized in that:it comprises speed detecting means for generating a synchronized alternating movement with the speed of the elevator component;
the speed detecting means are configured to not generate the synchronized alternating movement when a predetermined speed of the elevator component is exceeded and to thus activate the actuating (300) means;
the speed detecting means comprise a ratchet mechanism comprising:
a polygonal-shaped cam (110) on a first side of the auxiliary wheel (100) integral with said auxiliary wheel (100);
a ratchet wheel (120) on the first side of the auxiliary wheel (100) integral with said auxiliary wheel (100), said ratchet wheel (120) comprising a plurality of projections;
a rocker (130) having a first end and a second end, provided with:
a follower (140) at the first end for following the cam profile (110);
a ratchet (150) at the second end for locking the ratchet wheel (120) and thus locking the auxiliary wheel (100).
positioning means, comprising a plurality of lock washers (400) for pushing the auxiliary wheel (100) against the first surface (210) of the rail (200) and preventing sliding of the auxiliary wheel (100) on the rail (200);
means for detecting derailment and variation in a pressure setting of the auxiliary wheel (100) on the rail (200).
offsetting a stress exerted by the auxiliary wheel (100) on the rail (200) for preventing transmission of a reaction force on the elevator component;
setting a pressure between the auxiliary wheel (100) and the rail (200).
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description