ES1056825U - Safety device for lifting and similar pulled by engaging mechanisms. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

"Safety device for lifts and the like pulled by gear mechanisms" comprising a housing (1) fixed to the lift and a rotating part actuated by a pinion (8) linked to the lift displacement mechanism that includes a plurality of discs interiors that together with some pressing springs act as a brake, characterized by the fact that it includes a plurality of radially arranged triggers that can have a rotational movement with respect to some turrions (13) due to the effect of the centrifugal force caused by the rotation of all the assembly, having provided an elastic spring (14) fixed at one end to the turrion (13) and at the other end to a fixed part of the part (5), so that when there is an increase in speed there is a As the centrifugal force increases, the elastic spring expands so that the trigger (12) rotates towards the periphery so that it contacts a projection (15) until the joint stops. In addition, the angle of rotation is from when the set speed is reached until the safety system operates up to a maximum of 30 °. (Machine-translation by Google Translate, not legally binding)

Description

Safety device for elevators and similar traction mechanisms.

Object of the invention

The present Utility Model application has by object the registration of a security device for elevators and the like driven by gear mechanisms that incorporates notable innovations and advantages over devices  for the same purpose currently used.

More specifically, it refers to a safety device of the type comprising a fixed housing to the elevator and a rotating part driven by a linked pinion to the elevator travel mechanism that includes a plurality of inner discs that next to the pressing springs act as a brake, designed for application in cargo lifts, overhead doors, compensators, counterweights, palletizers, and All types of lifting devices.

Background of the invention

Currently, the use of safety mechanisms or devices for load elevators, or devices that have an ascending and descending trajectory for the transport of merchandise in order to avoid its fall to empty in the event of a breakdown or breakage of the elevator drive mechanism or similar device.

Usually, these types of devices consist of independent units that are arranged in the own mobile mechanism and they receive movement through a pinion geared to a rack of the drive mechanism or well by means of a chain sprocket independent of the transmission normal.

This device acts as a `` follower '' without no power application in any of the directions of rotation. However, when a break or system failure occurs tractor, the mobile device (lift) starts its gravity fall with the consequent increase in speed, so that the system detect this speed increase from the effect produced by centrifugal force and at tare speed, it snags causing the elevator to stop.

These types of devices work as follows mode: When a predetermined speeding occurs that reaches the tare speed, by force action centrifuge, a trigger sensor is locked against the fixed part stopping the rotating part and only allowing some discs interior, pinion and axle continue to rotate if the torque of the rack and pinion system is superior to the brake torque that forms the system consisting of an annular support, a cover, some discs intermediate and some inner discs. This turn or slip will continue until the total detention of the platform or mobile element. The friction of the discs transforms The energy of heat movement.

However, the arrest of the pieces rotating when the safety device acts occurs sharply, so that such an impact may affect the structure of some of the elements that compose it. In addition, another no less notable drawback is that on certain occasions, the reaction time for the interlocking to take place can be excessive in a way that implies a greater speed of fall and, therefore, a greater impact effort at the instant of stop

Description of the invention

The present invention has been developed with the in order to provide a security device that resolves the drawbacks mentioned above, also providing other additional advantages that will be apparent from the description which is accompanied below.

The safety device for elevators and similar betrayed by gear mechanisms of the present invention is of the type comprising a housing fixed to the elevator and a rotating part driven by a pinion linked to the elevator movement mechanism that includes a plurality of inner and outer discs that compressed by springs act as a brake, and is characterized by the fact that it includes a plurality of radially arranged triggers that may have a turning movement with respect to some turrions due to the centrifugal force caused by the rotation of the whole assembly, an elastic spring fixed at one end having been arranged turrion and at the other end to a fixed part, so that when an increase in speed occurs causes a increased centrifugal force, the elastic spring expands so that the trigger rotates towards the periphery so that contact one of the highlights until the set stops. The interlocking triggers and triggers are arranged in number enough that ensures that the angle of rotation since it is reached interlocking speed until the system operates security is a maximum of 30 °.

This reduction of the angle of rotation achieves decrease the speed increase experienced by the device due to the acceleration of gravity considering that in In case of elevator failure, an instant of free fall occurs. What allows to comply with the regulations in force in the different countries about safety in lifting devices.

The security device of this invention presents an improvement over the existing ones currently, consisting of the ability to reduce the impact violent produced by abrupt detention at the time of Engaging that affects the entire mechanism by improving the reliability This is achieved through the use of shock absorbers angles that drastically reduce the efforts requested.

These damping means for the interlocking are located in a ring that act when the triggers are locked in the projection while the ring rotates compressing said damping means until the torque of input is equal to the resistance pair.

In a preferred embodiment of the device safety of the invention, the damping means are constituted by segments of elastomeric material.

According to another aspect of the invention, the safety device comprises a means of unique adjustment of the enclave speed of all triggers.

Preferably, said adjustment means comprises a screw linked to a nut that allows sliding by a wedge-like element that allows angular displacement of the part where the springs are fixed allowing the compression or traction of elastic springs simultaneously and equal.

In this way, you can vary the speed to which will trigger the triggers against the projections previously mentioned. In turn, the interlocking of the trigger triggers a microswitch that sends an output signal from alarm, engine shutdown, etc.

Other features and advantages of the device of safety for elevators and the like object of the present invention will be apparent from the description of a preferred, but not exclusive, embodiment illustrated by way of non-limiting example in the accompanying drawings, in the which:

Brief description of the designs

Figure 1.- It is a side elevation view partially sectioned from the safety device of the present invention;

Figure 2.- It is an elevation view of detail in section of the device represented in the previous figure without the presence of the casing, shaft and pinion;

Figure 3.- It is a partially plan view sectioned by an A-A cut shown in figure 1;

Figure 4.- It is a plan view of the section made by a B-B cut in figure 1 corresponding to the outer ring and the drum;

Figure 5.- It is a detailed elevation view lateral section corresponding to the C-C cut made in figure 4; Y

Figure 6.- It is a detailed elevation view lateral section corresponding to the D-D cut made in figure 4.

Description of a preferred embodiment

As shown in Figure 1, the safety device for lifts and similar traction by gearing mechanisms of the present invention comprises a housing (1) formed by an annular body fixed to the structure of the  elevator by screws (2), a drum (3) located in the part inside, an annular support (4), a support disk (5) located between the support (4) and the housing (1). Said housing (1) is linked to the drum (3) through an outer ring (6) that is attached to the housing through screws (2) and (22).

The housing (1) is linked to an axis (7) that is driven by a pinion (8) that meshes with a rack (9) of the elevator to which the safety device is attached. To its instead, the axis (7) is linked to a plurality of discs interiors (10) attached to a second pinion (11) that at the time of interlock rotate if the system drive torque rack and pinion is superior to the brake torque.

On the other hand, figures 2 and 3 show as the support (4) has a plurality of triggers (12) susceptible of tilting on turrions (13) as a result of the centrifugal force that occurs when the whole assembly rotates. The effect of centrifugal force is counteracted by the action of springs (14) linked to each of the respective triggers (12). When there is an increase in speed that exceeds the elastic force of the spring (14), the trigger (12) is interlocks against projections (15) located in the drum (3). In the preferred embodiment, the support (4) comprises six triggers (12) and the drum (3) two projections (15) that ensure an interlocking in a maximum rotation angle of 30 °, the number of triggers being cited not limiting.

Regarding the enclave speed adjustment of the Triggers (12) are performed simultaneously and equally from a single set point Only by manipulating a screw (16) and a nut (17) that slides along the wedge formed by the element (18) fixed to the annular support (4) and to the ramp of the disk of  support (5), allowing freedom of angular movement over the housing (1). In its movement it compresses or tracts some springs (14) with which it is possible to modify the speed at which they will lock the triggers (12) against the projections (15).

It should also be noted that the interlocking of the triggers (12) actuate a microswitch (20) that sends a signal for the activation of an alarm, engine stop, etc.

Figure 4 shows how the housing (1) and the outer ring (6) are firmly connected by separators (21) and a plurality of screws (22). The drum (3) presents also some battlements (23).

In figures 4, 5 and 6 it is shown as the device of the invention comprises damping means formed by elastomeric buffer segments (24) for the interlocking that are located between the housing (1) and a drum (3) and that act when the triggers are locked in the projection (15) while the drum (3) rotates compressing said means of damping until the input torque is equal to the torque resistant. Once the effort ceases, the dampers (24) make return the drum (3) to its original position. Segments shock absorbers (24) can be replaced by other elements equivalents, such as helical springs, springs constituted by concave washers, etc.

The device presents at the opposite end of the housing a cover (25) (see figure 1) under which they are a series of intermediate outer discs (26) that make up the brake group together with the inner discs (10) and the brake loading springs (19).

The details, the shapes, the dimensions and others accessory elements, as well as the materials used in the manufacture of the safety device for elevators and of the invention may be conveniently substituted by others that are technically equivalent and do not depart from the essentiality of the invention or the scope defined by the claims included below.

Claims (5)

1. Safety device for elevators and the like driven by gearing mechanisms comprising a housing (1) fixed to the elevator and a rotating part driven by a pinion (8) linked to the elevator movement mechanism that includes a plurality of inner discs that next to some pressing springs, they act as a brake, characterized by the fact that it includes a plurality of radially arranged triggers that can have a turning movement with respect to turrions (13) due to the centrifugal force caused by the rotation of the entire assembly , an elastic spring (14) fixed at one end to the turrion (13) and at the other end to a fixed part of the piece (5) being arranged, so that when an increase in speed occurs there is an increase in the centrifugal force, the elastic spring expands so that the trigger (12) rotates towards the periphery so that it contacts a shoulder (15) until the joint stops to, being the angle of rotation from when the setting speed is reached until the safety system acts up to a maximum of 30 °. 2. Safety device for elevators and the like driven by gearing mechanisms according to claim 1, characterized in that it comprises a means of unique adjustment of the enclave speed of all the triggers (12). 3. Safety device for elevators and the like driven by gearing mechanisms according to claim 2, characterized in that said adjustment means comprise a screw (16) linked to a nut (17) that allows the sliding by an element a wedge mode that allows compression or traction of the elastic springs (14) simultaneously. 4. Safety device for elevators and the like driven by gearing mechanisms according to claim 1, characterized in that it comprises means for damping the interlocking that are located in a housing (1) that act when the triggers are interlocked in the projection. (15), compressing the angular movement of a drum (3) said damping means through battlements (23) located in the periphery until the input torque is equal to the resistance torque. 5. Safety device for elevators and the like driven by gearing mechanisms according to claim 4, characterized in that the damping means are constituted by segments of elastomeric material (24).