Unlocking control for a lift floor door

Abstract

Control system for disengaging a safety lock of a lift floor door, comprising: a linear actuation unit; at least one plate in elastically deformable material; at least one actuation cable between said actuation unit and said plate; said actuation unit, said plate and said actuation cable being associated with the lift cabin, in which the actuation cable induces a deformed configuration of said plate, and the plate in deformed configuration disengages said safety lock so as to allow the floor door to open.

Claims

1. A control system configured to disengage a safety lock of a lift floor door associated with an elevator shaft, said safety lock configured to prevent the lift floor door from opening when the safety lock is engaged, said control system comprising: at least one plate on a lift cabin, the at least one plate being elastically deformable such that the at least one plate is configured to vary between a formed configuration and a deformed configuration in which a center portion thereof protrudes relative to ends thereof, the at least one plate being positioned on an outer wall of the lift cabin such that, when the lift cabin is present and the at least one plate is in the deformed configuration, the center portion of the at least one plate contacts a lever to disengage the safety lock of the lift floor door; a linear actuator configured to deform the at least one plate to the deformed configuration by providing a force thereto; and at least one actuation cable connected between said actuator and the at least one plate, the actuation cable configured to transfer the force to the at least one plate.

2. The control system according to claim 1, wherein the at least one plate has a flat shape in the form of a substantially elongated rectangle.

3. The control system according to claim 2, wherein the at least one plate is made from spring steel.

4. The control system according to claim 2, wherein the at least one plate is made from elastically deformable plastic material.

5. The control system according to claim 1, wherein the at least one plate comprises: a fixed end that is firmly attached to a fixed support, and a mobile end that is firmly attached to a mobile support, the mobile support configured to slide linearly in a direction parallel to the at least one plate, the mobile support being connected to said actuation cable.

6. The control system according to claim 5, wherein the mobile support is configured to cause the at least one plate to vary configurations between the formed configuration and the deformed configuration in response to the linear sliding of mobile support, and the at least one plate is configured to selectively engage and disengage said safety lock based on the configuration of the at least one plate.

7. A lift comprising: the control system according to claim 1; and a lift cabin in an elevator shaft.

8. The control system according to claim 1, wherein the actuator comprises: a motor housed in a container fixed to the lift cabin; said motor configured to linearly actuate a pin, the pin having an eyelet that pulls a cylinder forwards or backwards; at least one cable having a first end and a second end, the first end of the at least one cable being fixed to said cylinder and the second end of the cable being fixed to the mobile support of a respective one of the at least one plate.

9. The control system according to claim 1, further comprising: a plurality of the at least one plate, each of the at least one plate being connected to the actuator with a respective one of the at least one actuation cables, each of the at least one plate being arranged on different sides of the cabin, so as to allow floor doors positioned on different sides of a well to open irrespective an opening direction of the floor doors.

10. The control system of claim 6, wherein the at least one plate is flat when the at least one plate is in the formed configuration and the at least one plate is curved when the at least one plate is in the deformed configuration.

11. The control system of claim 1, wherein the safety lock of the floor door comprises: a bolt configured to move between a first position that locks the floor door and a second position that unlocks the floor door; and a rolling lever configured to move the bolt between the first position and the second position as the at least one plate varies between the formed configuration and the deformed configuration.

12. A lock controller comprising: a mobile support configured to slide in a first direction; and at least one deformable plate having a first end connected to the mobile support, the at least one deformable plate configured to vary, in response to the mobile support sliding in the first direction, a shape thereof between a first configuration where the at least one deformable plate is flat and a second configuration where the at least one deformable plate is curved such that the at least one deformable plate selectively applies pressure, via a lever, to a safety lock of a floor door of an elevator shaft based on whether the at least one deformable plate is in the first configuration or the second configuration, the safety lock configured to selectively allow the floor door to open in response to the pressure from the at least one deformable plate.

13. The lock controller of claim 12, wherein the lock controller is positioned on a lift cabin.

14. The lock controller of claim 13, wherein the lock controller further comprises: a linear actuator configured to apply a force, via an actuation cable, to the at least one deformable plate such that the at least one deformable plate applies the pressure to the safety lock of the floor door, if when the lift cabin is aligned with the floor door.

15. The lock controller of claim 14, further comprising: a plurality of the at least one deformable plate, each of the plurality of the at least one deformable plate being arranged on a respective side of at least two sides of the lift cabin, the at least two sides of the lift cabin having an opening that is configured to align with an associated floor door, each of the plurality of the at least one deformable plate configured to selectively apply pressure to a safety lock of the associated floor door based on whether an associated one of the plurality of the at least one deformable plate is in the first configuration or the second configuration, the pressure configured to allow the associated floor door to open irrespective of an opening direction of the floor door.

Description

(1) These and other advantages of the invention shall become clearer in the rest of the description, with the help of the description of some preferred but non limiting embodiments, and with the help of the drawings in which:

(2) FIG. 1 schematically shows some components of a control for a floor door, according to one embodiment and showing the unlocking control positioned as if the cabin were on the floor;

(3) FIG. 2 is analogous to FIG. 1, and shows the control in the position with the door unlocked;

(4) FIGS. 3 and 4 show the main components of the system in greater detail, respectively in locked and unlocked door conditions, according to one embodiment;

(5) FIG. 5 is a detail of the linear motor unit;

(6) FIG. 6 is a schematic cross section of a lift comprising a system according to the invention, so as to allow the opening of floor doors on different sides of the well hinged on the right or on the left according to the requirements;

(7) FIG. 7 is a detail of FIG. 6;

(8) FIG. 8 shows a diagram of a lift with door openings on different sides of the well, and hinged on the right or on the left;

(9) FIG. 9 is a diagram of a floor door mechanical locking and unlocking system, which can be used in some embodiments of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(10) FIGS. 1-2 show the essential components of a control according to an embodiment of the invention. Reference numeral 1 indicates the frame of a lift floor door. Said door has a safety lock system, which prevents it from opening, controlled by a lever 2. The cabin comprises a control for disengaging the aforementioned lock and allowing the floor door to open. Said control essentially comprises a linear actuation unit 3 connected to a plate 4 made of elastically deformable material, for example spring steel, in contact with said lever 2.

(11) The unit 3 acts upon the plate 4 by means of an actuation cable 5, which shall be illustrated in the rest of the description. The ends of the plate 4 are fixed respectively to a first fixed support 6 and to a second mobile support represented by a slide 7. Said slide 7 can slide in the direction indicated by the double arrow A of FIG. 1, parallel to the main dimension (length) of the plate 4.

(12) FIG. 2 shows the deformed configuration of the plate 4, by effect of the traction of the actuation cable 5. It can be seen in the figure how the slide 7 moves, while the opposite support 6 stays still, and consequently how there is a curving 4.sub.A of the plate 4. Due to this deformation, the plate 4 acts upon the lever 2, in particular the curving 4.sub.A causes a rotation of the lever in the direction indicated with B (FIG. 2). Such a rotation B of the lever 2 disengages the safety lock and allows the floor door to open when the cabin is present.

(13) It should be noted that a substantially reversed embodiment is also possible in which the plate in resting condition is curved (FIG. 2) and a traction of the actuation cable 5 has the effect of flattening the plate 4, bringing it into the configuration of FIG. 1, thus freeing the mechanical lock. In such a case the support 6 will be mobile and the support 7 will be fixed. The main advantage of this variant consists of keeping the plate curved even when the respective switch has not been actuated.

(14) Details of the actuator unit 3, according to a preferred embodiment, are shown in FIGS. 3 and 4. The actuator unit 3 comprises a motor 10 housed in a container 16 fixed to the lift cabin, for example on the roof of the cabin. Said motor 10 linearly actuates a pin 11 with an eyelet that moves forward or backward a cylinder 12, guided by slots 15 of the side walls of the container 16. A first end of a metal cable or cord 13 is fixed to said cylinder 12; the opposite end of the cable 13 is fixed to the slide 7. Said slide 7 slides in a slot 9 of the support 8 which is visible in FIGS. 2 and 4. The cable 13 is covered by a sheath 14 and comes out from a guide pin 17.

(15) As more clearly visible in the detail of FIG. 5, the unit 3 is foreseen to simultaneously control a plurality of cables 13, having a plurality of holes 18 on the cylinder 12, and a plurality of guide pins 17. This characteristic of the invention makes it possible to simultaneously control a plurality of plates 4 arranged on different sides of the cabin, and is useful in systems where the opening of the doors, on the various floors, is located on different sides of the well and/or is hinged on the right or on the left. Such a characteristic, which forms one of the advantages of the invention, is simplified in FIGS. 6 to 8.

(16) In the example of FIG. 6, an actuation unit 3, preferably fixed on the roof of the cabin C, is connected to three actuation cables 51, 52, 53, which act upon respective door locking/unlocking levers 21, 22 and 23 through respective deformable plates 41-43 analogous to the plate 4. Two of these plates 42, 43 are shown in the detail of FIG. 7.

(17) FIG. 6 illustrates a well V, in section corresponding to a certain floor in which the floor door P is present on the side V.sub.1 of the well V. The lever 21 consequently unlocks the floor door P; however, the system, also comprising the controls 52, 53 for the levers 22, 23, is capable of also unlocking a floor door present on the lateral side V.sub.2 or V.sub.3 opposite the side V1.

(18) When the cabin C reaches a certain floor, the actuation unit 3 simultaneously causes the deformation (for example the curving as shown in FIG. 4) of all the plates 41, 42, 43; according to the floor only one of the plates will meet the locking lever 21, 22 or 23, and will unlock the respective door. For example in FIG. 6 it is clear that the plates 42 and 43 deform idly, whereas the plate 41 meets the lever 21 of the door P unlocking the safety lock and allowing it to open.

(19) This characteristic is particularly useful in lifts of the type given as an example in FIG. 8, in which on the respective floors I, II and III there are floor doors P.sub.I, P.sub.II and P.sub.III on different sides of the well V and that are hinged on the right or on the left. FIG. 6 makes it possible to appreciate the very small bulk of the control obtained according to the invention.

(20) With reference now to FIG. 9, in a preferred embodiment, the plate 4 disengages the mechanical lock of the floor door by moving a roller lever 20 that moves a bolt 21. These details, like the lever 20 and the bolt 21, can be made like in the prior art. Due to traction of the actuation cable 5, the slide 7, the plate 4 and the lever 20 are respectively brought into the positions indicated with reference numerals 7.sub.A, 4.sub.A and 20.sub.A, disengaging the bolt 21. It should be noted that the choice of the system for locking and unlocking the floor door (mechanical bolt or other) is not essential for the purposes of the invention and can be made based upon a technique known in the field.

(21) One example of operation is as follows. The cabin stops at the floor thanks to magnetic sensors positioned on every floor, which give the information of the position of the cabin to the card for controlling the lift. The card controls the stopping of the motor of the lift and the unlocking of the lock of the door through the actuation of the slider, thus supplying power to the unit 3.

(22) The system comprises two end stops which limit the maximum stroke of the slider system, i.e. the maximum stroke of the pin 11. When the cabin arrives at the floor the motor 10 is supplied with power until there is the action of an end stop. The intervention of the end stop interrupts the power supply of the motor and the plate stays in the curved position while the lift cabin is at the floor. When the control card receives a call, the motor 10 is supplied with power to bring the slider back in the retracted position until a second end stop intervenes. After the intervention of said second end stop, the feeding of the motor 10 is interrupted and the plate remains undeformed for the entire stroke of the lift.