EP2687473A1

EP2687473A1 - Device for protecting against the uncontrolled movement of a lift car and speed limiter which includes such a device

Info

Publication number: EP2687473A1
Application number: EP12758222.9A
Authority: EP
Inventors: Martí ESCOFET ESTEVE
Original assignee: Aplicaciones Electromecanicas Gervall SA
Current assignee: Aplicaciones Electromecanicas Gervall SA
Priority date: 2011-03-16
Filing date: 2012-03-12
Publication date: 2014-01-22
Anticipated expiration: 2032-03-12
Also published as: EP2687473B1; ES2363311A1; WO2012123607A1; EP2687473A4; ES2363311B1; ES2363311A8

Abstract

Device for protecting against the uncontrolled movement of a lift car, which is suitable for being coupled to a speed limiter having a pulley (2) on a shaft (3), said device comprising: a ring gear (5) connected to the pulley; a pivoting support means (6) which can be coupled to the shaft (3), carries out a pivoting movement with respect to said shaft (3) and includes a blocking mechanism which acts on the ring gear (5) by means of an electromagnet, a solenoid or the like; and an electrical detector which is connected to the blocking mechanism and the movement trajectory of the pivoting support means (6) and, when the blocking means act on the ring gear (5), when the pivoting support means (6) has carried out an angular movement, the electrical detector sends an activation signal to a control unit connected to the lift in order to actuate means for stopping the lift car.

Description

DESCRIPTIVE MEMORY

OBJECT OF THE INVENTION

The purpose of the invention patent application herein is to register a device for protecting against the uncontrolled movement of a lift car that can detect the movement thereof and that incorporates significant innovations and advantages.
More specifically, the invention proposes the development of a device for detecting the uncontrolled movement of a lift car, intended for being coupled to a speed limiter for a lift, thereby increasing the safety of the hoist, lift or the like.

BACKGROUND OF THE INVENTION

The arrangement for speed limiters intended for operating transport means suspended by a cable, such as hoists, cable cars, etc. are well known.
An example of speed limiters are described in patent no. ES 2 306 623 , the patent holder being the same as that of the present application.
Due to regulatory changes and updates in respect of the safety components in lifts, component manufacturers have developed new devices that increase the security measures of a lift, including the uncontrolled movement of the car. These devices are used in the speed limiters.
Currently, there are many complex devices on the market and they do not form part of an actual element of a lift, such as the limiters.

DESCRIPTION OF THE INVENTION

The invention herein has been developed with the aim of providing a device for detecting the movement of a lift car that resolves the aforementioned drawbacks, providing, in addition, other additional advantages that will become apparent from the description appended hereinafter.
It is therefore an object of this invention to provide a device for protecting against the uncontrolled movement of a lift car, in particular, which is suitable for being coupled to a speed limiter of the type that comprises a pulley on a shaft on which a cable or the like slides, and retaining means linked to the pulley. More specifically, it is characterised in that said device comprises a ring gear fixedly secured to the pulley; a pivoting support means which can be coupled to the shaft of the speed limiter such that it carries out a pivoting movement with respect to said shaft, that includes a blocking mechanism with a linear motion, that acts on the ring gear, by means of an electromagnet, a solenoid or the like; and an electrical detector which is connected to the blocking mechanism and the movement trajectory of the pivoting support means.
In this way and when the blocking means act on the ring gear, when the pivoting support means has carried out a predetermined angular movement caused by the movement of the pulley, the electrical detector sends an activation signal to a control unit connected to the lift in order to actuate means which are suitable for stopping the lift car.
In this way, a device for detecting and stopping a lift car which can be applied to any speed limiter regardless of the dimensions of the pulley of the speed limiter is obtained, therefore a wide variety of devices with different geometries and dimensions is avoided depending on the dimensions of the pulley mounted on a particular limiter.
Preferably, the pivoting support means include tensioning means for coupling to the speed limiter, such that when the blocking mechanism has no voltage from the electromagnet or solenoid, said mechanism operates on the ring gear and the system is ready to detect the uncontrolled movement effectively and reliably.
In a preferred embodiment of the invention, the blocking mechanism comprises a locking insert which can be coupled to the ring gear.
Advantageously, guide means are provided in the pivoting support means along which the locking insert linearly moves. These guide means consist of at least one recessed portion formed in the body of the pivoting support means along which a guide body fixed to the locking insert moves.
According to another characteristic, the pivoting support means has an elongated section having an arcuate recess on the upper edge thereof, in which the elongated section can abut an electrical detector switch, which detects the uncontrolled movement.
Advantageously, the end of the locking insert facing the ring gear has sawtooth-shaped teeth, such that it facilitates the interlocking of the blocking element with the ring gear.
It is another object of the present invention to provide a speed limiter which comprises a pulley on a shaft, on which a cable or the like slides, and retaining means linked to the pulley, which is provided with a device for protecting against the uncontrolled movement of a lift car as previously described.
According to another aspect of the speed limiter, it comprises a bedplate body with two fins facing each other, comprising stop means for limiting the angular path of the pivoting support means.
These stop means may comprise a groove following an arcuate path formed in one of the fins of the bedplate body.
Other characteristics and advantages of the device, object of the invention herein, will become apparent from the description of a preferred, although not exclusive embodiment, which is illustrated by way of non-limiting example in the drawings appended, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1. - Front elevation view of a speed limiter for a lift which includes the device for protecting against the uncontrolled movement according to the present invention;
Figure 2.- Front elevation view of the speed limiter with the detector device of the invention;
Figure 3.- Exploded sectioned side elevation view of the speed limiter and the detector device shown in the preceding figures; and
Figure 4.- Sectioned side elevation view of the limiter with the detection device according to the invention.

DESCRIPTION OF A PREFERRED EMBODIMENT

As shown in the attached figures, a speed limiter can be seen, generally indicated by the reference (1), comprising a pulley (2) on a shaft (3) on which a cable or the like slides, and retaining means linked to the pulley (2), characterised in that the speed limiter is further provided with a device for detecting the movement of a lift car which is described below. The retaining means can operate in the same way as that described in Spanish patent no. ES 2306623 .
Furthermore, a bedplate body (4) is provided with two fins facing each other between which the shaft (3) is supported and arranged.
This detection device comprises a ring gear (5) that is fixedly secured to the pulley (2) of the limiter (in an alternative embodiment it may be an integral part of the pulley itself), a pivoting support means (6) that can be coupled to the shaft (3) of the speed limiter (1) such that it carries out a pivoting movement with respect to said shaft (3), as indicated by means of an arrow (f) in figure 2, that includes a blocking mechanism which acts on the ring gear (5) and an electrical detector (7) which is connected to the blocking mechanism and the movement trajectory of the pivoting support means (6). As shown, the pivoting support means (6) consists of an elongated body which is fixed on the upper part thereof by means of an orifice through which the shaft passes (3).
When the pivoting support means has carried out a predetermined angular movement caused by the movement of the pulley (2) and therefore the lift car, such as a distance defined by a maximum angle, it sends a motion detection signal through an electric switch (7) and subsequently causes a mechanical interlocking of the speed limiter, which causes the pull of the cable or the like of the speed limiter and therefore the wedging of the safety device on the lift (retaining means) that is provided.
The pivoting support means (6) may optionally include tensioning means that are coupled to the housing body (4) of the speed limiter (1).
In respect of the blocking mechanism, it mainly comprises a locking insert (10) which can be coupled to the ring gear (5) for blocking, a release (11) linked to the electromagnetic actuator (8) (electromagnet, coil or the like) which is attached to the locking insert (10).
The release (11) has a shaft which is externally provided with a helicoidal spring (not shown for clarity).
Guide means are provided in the pivoting support means by which the locking insert linearly moves. In particular, two grooved portions are provided (12), formed in alignment in the body of the pivoting support means(6) through which a guide body (13) attached to the locking insert (10) passes along each one. This guide body (13) in the present embodiment consists of a metallic cylindrical body attached by means of bolting elements.
The pivoting support means (6) has an additional elongated section (60), attached thereto by bolting elements, which has an arcuate recess (61) centred on the upper edge thereof, wherein the elongated section (60) can abut a switch (70) protruding from the bottom of the electric switch (7). This elongated section (60) has two mechanical stops (14) that are attached to the pivoting support means (6).
The aforementioned tensioning means can be coupled to the elongated section (60) of the pivoting support means(6).
The end (101) of the locking insert(10) facing the ring gear (5) has sawtooth-shaped teeth that facilitates coupling in the existing space between the ring gear teeth (5).
In respect of the bedplate body (4) it is composed of two fins (4a, 4b) which are facing each other between which the shaft (3) is supported, comprising stop means for limiting the angular path of the pivoting support means (6), which consist of a groove (40) following an arcuate path formed in one of the fins of the bedplate body. The two mechanical stops (14) define the maximum path of the pivoting support means in respect of a groove (40).
The fin (4a) that has the groove (40) mentioned above may include a dowel or the like in which the tensioning means are secured, in the case of being present.
The detection device according to the invention and described in the speed limiter (1) is operated as follows:

When a lift car stops, the flow of electric current to the coil is cut off such that it pushes the blocking element upwards, by the action of the spring, until it abuts with the ring gear (position shown in figure 1). In the event of the car moving when the device is in this position, the ring gear rotates by the rotation of the pulley (2), pulling the pivoting support means with the built-in blocking mechanism. In this situation, the switch (70) moves upwards such that it causes the electric switch (7) to send a signal which reports a sliding movement that is received by the control unit of the lift to actuate means which are suitable for stopping the lift car. In the event that this movement of the car, with the doors either open or closed, does not stop, the pivoting support means (6) will collide at one end of the groove (40) causing the pulley (2) of the speed limiter to stop against the stop(14) by the action of the locking insert (10) and the ring gear (5) and, therefore, to pull on the cable of the speed limiter. This pull on the cable of the limiter actuates the safety device on the lift causing the car to stop and to stop permanently.

The details, shapes and dimensions and other accessory elements as well as the materials used in the manufacture of the protective device against the uncontrolled movement of a lift car of the invention may be conveniently replaced by others which are technically equivalent and do not depart from the essential nature of the invention or from the scope defined by the claims provided hereinafter.

Claims

Device for protecting against the uncontrolled movement of a lift car, in particular which is suitable for being coupled to a speed limiter comprising a pulley (2) on a shaft (3), on which a cable or the like slides, and retaining means linked to the pulley (2), characterised in that said device comprises:
a ring gear (5) fixedly secured to the pulley;

a pivoting support means (6) which can be coupled to the shaft of the speed limiter such that it carries out a pivoting movement with respect to said shaft (3), and includes a blocking mechanism which acts on the ring gear (5) by means of an electromagnet solenoid or the like; and

an electrical detector which is connected to the blocking mechanism and the movement trajectory of the pivoting support means (6), such that when the blocking means act on the ring gear (5), when the pivoting support means (6) has carried out a predetermined angular movement caused by the movement of the pulley (2), the electrical detector sends an activation signal to a control unit connected to the lift in order to actuate means for stopping the lift car.
Device according to claim 1, characterised in that the pivoting support means (6) includes tensioning means for coupling to a speed limiter.
Device according to claim 1, characterised in that the blocking mechanism comprises a locking insert (10) which can be coupled to the ring gear (5), a release connected to an electromagnetic actuator which is attached to the locking insert (10).
Device according to claim 3, characterised in that the release is provided with elastic means.
Device according to claim 4, characterised in that said elastic means consist of a helicoidal spring.
Device according to claim 3, characterised in that guide means are provided on the pivoting support means by which the locking insert (10) linearly moves.
Device according to claim 6, characterised in that the guide means consist of at least one recessed portion formed in the body of the pivoting support means(6) along which a guide body fixed to the locking insert moves.
Device according to claim 3, characterised in that the electromagnetic actuator comprises a coil.
Device according to claim 1, characterised in that the pivoting support means (6) has an elongated section having an arcuate recess on the upper edge thereof, wherein the elongated section can abut an electrical detector switch.
Device according to claims 2 and 9, characterised in that the tensioning means are coupled to the elongated section.
Device according to claim 3, characterised in that the locking insert has an end facing the ring gear (5) with sawtooth-shaped teeth.
Speed limiter (1)having a bi-directional locking device comprising a pulley on a shaft on which a cable or the like slides, and retaining means linked to the pulley (2), characterised in that a device for detecting the movement of a lift car is provided, according to any of the claims 1 to 11.
Speed limiter (1) according to claim 12, characterised in that it comprises a bedplate body (4) having two fins (4a, 4b) facing each other between which the shaft (3) is supported, comprising stop means to limit the angular path of the pivoting support means (6).
Speed limiter (1) according to claim 12, characterised in that the stop means consist of a groove (40) following an arcuate path formed in one of the fins (4a) of the bedplate body (4).
Speed limiter according to claim 13, characterised in that one of the fins (4a) includes a dowel or the like in which the tensioning means are secured.
Speed limiter according to claim 12, characterised in that the ring gear (5) has coupling means for fixedly securing it to the pulley (2).
Speed limiter according to claim 12, characterised in that the ring gear (5) and the pulley (2) form an integral part thereof.
Speed limiter according to claims 14 and 15, characterised in that the stop means include a stop that protrudes from the pivoting support means (6) that passes through the groove of the arcuate path.