ELECTROMECHANICAL DRIVE BY FLEXIBLE TRANSMISSION FOR THE ACTIVATION OF LIFT SAFETIES

Abstract

Drive comprising a set of safeties that can be bidirectional or unidirectional. In the case of the bidirectional system, it is formed by two wedge rollers (1) and (2) that run through oblong grooves (11) and (12) respectively provided in a protective plate (16). The wedge rollers (1) and (2) are assembled onto floating anchors (14) and (15) respectively, which anchors are linked together by means of a spring (5) ; on the other hand it comprises a drive assembly comprising a coil (3) where the transmission between the drive and the wedge assembly is carried out by means of a flexible transmission comprising two cables (7) and (8) joined at one of their ends to the drive assembly and at the other end to the floating anchors (14) and (15) on which the wedge rollers (1) and (2) are mounted. In addition, the bolts of the rollers (1) and (2) run through the oblong holes of a discriminating plate (6) which is responsible for separating the non-wedged roller from the guide. This system allows separate mounting of the wedge assembly with respect to the drive assembly.

Claims

1. Electromechanical drive by flexible transmission for the activation of lift safeties comprising a bidirectional wedge assembly comprising two wedge rollers (1) and (2) that run through oblong grooves (11) and (12) respectively performed on a protection plate (16) and said wedge rollers (1) and (2) are mounted on floating anchors (14) and (15) respectively and joined together by means of a spring (5), on the other hand it comprises a drive assembly comprising a coil (3) characterised in that the transmission between the drive assembly and the wedge assembly is carried out by means of a flexible transmission comprising two cables (7) and (8) joined at one of their ends to the drive assembly and at the other end to the floating anchors (14) and (15) on which the wedge rollers (1) and (2) are mounted, where the floating anchors (14) and (15) are mounted on a discriminating plate (6) that allows differentiating the wedging of the roller.

2. Electromechanical drive by flexible transmission for the activation of lift safeties according to claim 1, characterised in that the drive assembly comprises a coil (3) attached to a skid (13), which is in turn connected to a mobile carriage (10) balanced by two compensating springs (4) joined at the lower corners of the mobile carriage (10) and on which joints of the mobile carriage (10) with the compensating springs (10) are connected each of the ends of the cables (7) and (8).

3. Electromechanical drive by flexible transmission for the activation of lift safeties according to claim 1 or 2, characterised in that the drive assembly has a safety contact (9) that will cut a safety line.

4. Electromechanical drive by flexible transmission for the activation of the lift safeties according to any of the preceding claims, characterised in that the drive assembly and the wedge assembly are mounted separately from one another.

Description

DESCRIPTION OF THE DRAWINGS

[0022] In order to complement the description being made and to aid towards a better comprehension of the features of the invention, according to our preferred practical embodiment, we incorporate as an integral part of said description a set of drawings that are illustrative and not limiting in nature and represent the following.

[0023] FIGS. 1 to 5 show and progressively identify the different elements that are part of the electromechanical drive for braking lift safeties by means of flexible transmission, where the wedging means and the drive are assembled and joined together.

[0024] FIG. 6 shows a representation of the same previous elements except that the wedging means of the guide and the drive means are not mounted together, but separately.

PREFERRED EMBODIMENT OF THE INVENTION

[0025] In view of the figures, a preferred embodiment of the proposed invention is described below.

[0026] FIGS. 1 to 4 show that the bidirectional electromechanical drive by flexible transmission comprises: [0027] A wedge assembly formed by two wedge rollers (1) and (2) that run through oblong grooves (11) and (12) respectively made on a protective plate (16), the wedge rollers (1) and (2) being joined by a spring (5) and mounted on floating anchors (14) and (15) respectively. [0028] A drive assembly comprising a coil (3) that when the system is at rest is actuated by placing the wedge rollers (1) and (2) in a non-interlocked position against the force of the spring (5). In addition, it comprises means for adapting the transmission of the coil drive (3) to the transmission means from the drive assembly to the wedge assembly.

[0029] FIG. 5 shows the unidirectional version of the flexible drive and what it comprises. [0030] A wedge assembly formed by a wedge roller (1) and running through an oblong groove (11) made on a protective plate (16), the wedge roller (1) being attached to a fastening by means of a spring (5) and mounted on a floating anchor (14). [0031] A drive assembly comprising a coil (3) characterised in that the transmission between the drive and the wedge assembly is carried out by means of a flexible transmission comprising a cable (7) connected at one of its ends to the drive assembly and at the other end to a floating anchor (14) on which the wedge roller (1) is mounted.

[0032] Where the transmission means from the drive assembly to the set of wedges are flexible means, preferably cables.

[0033] The means for adapting the transmission of the drive from the coil (3) to the transmission means comprise a mobile carriage (10) preferably rectangular in shape that has first ends of two compensating springs (4) attached at its lower corners, the mobile carriage (10) being linked to the end of the coil (3) by means of a skid (13), and where the flexible transmission means are joined on the first ends of the two compensating springs (4) at their junction with the mobile carriage (10).

[0034] The flexible transmission means comprise two rods (7) and (8) that run between the joint of the end of the compensating spring (4) with the mobile carriage (10) and the floating anchors (14) and (15) of the wedge rollers (1) and (2).

[0035] The system will carry a safety contact (9) that will cut the safety line.

[0036] It is interesting to say that the reset assembly can be separated from the safeties themselves because the cables allow this separation, facilitating assembling the safety assembly separately. (FIG. 6). Leaving the part of the safeties and the block in the frame and taking the part of the coil to another more convenient location of the lift car such as above the cabin.

[0037] It is important to highlight that this configuration allows the use of a single solenoid that, by means of a double mobile carriage, allows the right and left safeties to be activated simultaneously.

[0038] In this way, since the system works in positive safety, the maintenance solenoid can be connected to the encoder device or other positioning device and the more powerful solenoid can be connected to the control panel. When we talk about solenoids we do not intend to limit the invention to a single actuator, since the activation could be functional with another element such as a single coil solenoid with an electric actuator.

[0039] A discriminating plate (6) has been designed to discriminate between the directions of the lift car. This consists in a sheet with two slotted holes (17) and (18) through which the roller bolt runs. When the wedging has not occurred, the plate is resting by gravity on the bolt, butting against the upper position of the upper oblong. When the rollers are placed in the wedging position, the bolt of the rollers circulates along the oblong of the discriminating plate without opposition and when one of the rollers is wedged the other would move away since said plate would push the bolt of the other roller towards a non-interlocking position (FIG. 3).

[0040] Having sufficiently described the nature of this invention and the embodiment thereof, it is noted that without departing from the essence thereof, other embodiments are possible that may differ in certain details from that given by way of example, which will also be included in the scope of protection sought, provided the main principle of the invention is not altered, changed or modified.