SU1164186A2 - Device for braking lift cabin - Google Patents

Abstract

DEVICE FOR BRAKING OF ELEVATOR CABINS by author. St. No. 1047813, characterized in that, in order to improve performance in operation by ensuring that the wedge is constantly pressed against the roller, the carrying arm is a vertical plate resilient plate, the free end of which is placed in a hole made in the wedge.

Description

The invention relates to hoisting machines used in elevators having an emergency braking device, and is an improvement of the known device according to the basic auto. St. No. 1047813.

The purpose of the invention is to improve the operational characteristics of the work by ensuring that the wedge is constantly pressed against the roller.

FIG. 1 shows the proposed device from the direction of Yush.i, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. 2; in fig. 5 is a section of YYD in FIG. four.

A device for braking an elevator car contains a composite case mounted on cab 1, made in the form of an open box, the bottom of which is extended to guide 2. The case, for example, consists of two sidewalls 3 connected by bolts 4, upper 5 and lower 6 horizontal plates with grooves for placing the head of the guide 2 in them. In the composite case there is a wedge clamping mechanism consisting of a shoe 7, a roller 8 and a wedge 9, and a safety gear activating shaft 10 located in the groove F of the sidewall 3. Shaft 10 carries lever 11, mutual acting with a wedge 9 which is mounted for engagement with the guide 2. On the shaft 10 reinforced lever 12 coupled via the rope 13 with a speed limiter (not shown). Cheeks 14 are installed between plates 5 and 6, in which the upper side has protrusions K entering the holes L of the top plate 5. They are fixed from vertical movements of the cheek 14, for example, by means of bolts 15. The lever 11 is made in the form of an elastic plate missed in slot M, made in the cheek 14, and constantly tightens due to its elasticity and pre-deformation of the wedge 9 to the roller 8, and the last to the block 7. The end of the plate is placed in the hole H, made in the wedge 9.

In the normal operating (transport) mode of movement of the cab 1, the wedge 9 due to the constant influence on it of the elastic lever 11 is located in the position most remote from the head of the guide 2 due to the forced choice of gaps in the serial joints of the wedge 9 with the roller 8, the roller 8 with the block 7, pads 7 with the supports of the plates 5 and 6, as a result of which in this mode the possibility of the wedge 9 contacting with the guide 2 is excluded, and thus the possibility of the spontaneous operation of the catchers in this mode is excluded.

In addition, in the installation position, the horizontal force of the pre-deformed elastic arm 11 ensures that a force between the wedge 9, the roller 8 and the pad 7 normal to the inclined (wedge) surface has a vertical component that contributes to keeping the wedge in the lower position, i.e. in this case, with an appropriate selection of forces, the use of a special return spring, currently used in elevators, can be abandoned.

In an emergency situation when the cabin moves down, the drive for switching on catchers provides an application to the lever 12, by means of a rope 13, a vertical, directed upward force required to raise the wedges 9 and to further deform the elastic arms P.

0 The interaction of the roller 8 and the wedge 9 causes simultaneously with the rise the displacement of the wedge 9 towards the guide 2, which is accompanied by an additional deformation of the elastic arms 11. After the clearance of the transport position between

the wedge 9 and the guide 2 cause a force contact, which also ensures the force contact between the wedge 9 and roller 8 and between the roller 8 and the block 7, causing an increase in its deformation and thereby an increase in the force effect in the listed places of the force contact. The normal force of the wedge 9 on the guide 2 determines the braking force applied to the wedges 9 and causes braking and stopping of the elevator car. Increase normal effort

between the wedges 9 and the guide 2 stops at the moment when the wedge 9 rests on the plate 5. The movement of the wedge 9 and roller 8 in the horizontal direction along the lever 11 is prevented by the bottom of the composite case and the cheeks 14. After the braking of the cab is completed and removed including effort in the rope 13 and the lever 12, the wedge 9 under the influence of the elastic lever 11 returns to its original transport (lower) position and is installed on the clamp 16, while the deformation of the elastic lever AND decreases to its installation value, thanks to The wedge 9 remains pressed against the roller 8. It should also be noted that the constant clamping due to the elasticity of the lever 11 of roller 8 between

The Q wedge 9 and the block ensures, when selecting the gap b, a stable roller stroke, which in turn ensures the stability of the braking force and the best distribution of the specific pressures between the wedge 9 and the guide 2.

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Claims (1)

DEVICE FOR BRAKING THE LIFT CABIN by ed. St. No. 1047813, characterized in that, in order to improve operational performance in operation by ensuring constant pressing of the wedge to the roller, the supporting arm is an elastic plate located in a vertical plane, the free end of which is placed in the hole made in the wedge.