Elevator noise minimizer

Abstract: A car door seal, comprising a brush 32, is utilized to seal the openings 42 between a closed car door and an elevator car and to minimize backlash between the car doors and the car. By utilizing a brush, such uneven openings are effectively sealed because the brushes bend for narrower openings between the car door and the car. The brush also provides effective damping and spring forces between the door and the car. As a result, door rattle, caused by backlash and aerodynamically induced vibration loads during car travel, is minimized, thereby minimizing vibration and noise within the interior of the car.

Description: This invention relates to elevators and more particularly to a device for minimizing the noise and vibration migrating to the interior of an elevator car. Elevator cars have doors which enclose the interior of the car when the car travels along a hoistway. The doors, which translate across an opening, are supported at their upper periphery by rollers hung from a car lintel, and at their lower periphery by gibs guided by grooves within a car doorsill. When the doors close, there are some openings around the door edges. Typically, the area of the openings can be minimized by using heavier gauge material and/or by requiring tighter manufacturing tolerances. However, heavier gauge material is more expensive and tighter tolerances may cause installation problems. Normal practice requires relatively looser tolerances to allow for manufacturing variations. As a result, the openings, which are larger than desirable, allow noise to migrate to the interior of the car. Further, there is a certain amount of backlash between the lintel and the rollers and between the gibs and the doorsill. The backlash may allow the car doors to rattle as the car encounters aerodynamically induced vibration loads during car travel thereby increasing noise and vibration within the interior of the car. WO83/02640 describes a smoke sealing system for use with elevator doors. The preamble to the independent claims are based on this document. EP-A-418510 describes another elevator door seal. This document was published after the priority date of the present application. It is an object of the invention to provide an elevator car having a minimum of noise therein. It is a further object of the invention to minimise vibration within the elevator car. According to the invention, there is provided apparatus for minimizing noise and vibration in an elevator car, said car having an exterior, an interior, and a door, said door acting as a barrier to said interior and having a length of travel, said apparatus comprising: an elongate brush extending along a dimension of said door, said brush extending from one of said door or said exterior of said car toward the other of said door or said exterior of said car and characterised by said brush having a spring force which is sufficient to resist the forces which act on the door transverse to the plane of the door during car travel for minimizing infiltration of noise through gaps between said door and said exterior and for minimizing backlash between said door and said exterior. The elongate brush car door edge seal is utilized to seal the openings between a closed car door and an elevator car and to minimize backlash between the car doors and the car. By utilizing a brush, uneven openings between the car and the car doors are effectively sealed because the brushes bend for narrower openings between the car and the car doors. The brush also provides an effective damping and spring force between the door and the car. As a result, door rattle, caused by backlash and aerodynamically induced vibration loads during car travel, is minimized, thereby minimizing vibration and noise within the interior of the car. An embodiment of the invention will now be described by way of example only and with reference to the accompanying drawings, in which: Figure 1 shows an elevator car having an embodiment of the seal of the invention; Figure 2 is a view taken along the line 2-2 of Figure 1; and Figure 3 shows a second embodiment along the lines of 2-2 in Figure 1. Referring to Figure 1 an elevator car 10 is shown. The car consists of doors 12, a door operator 14, side panels 16, and front panels 18. As is known in the art each door hangs from a lintel 20 by means of a door hanger 22 and is guided at a lower portion thereof by gibs (not shown) disposed within a groove 24 of a doorsill 26. Each door has a leading edge 28, and a trailing edge 30. Because of tolerances between each door 12 and front panels 18, there are gaps (not shown) created between the front panels and the doors at the trailing edges 30 thereof. Noise and other extraneous sound leak into the car through these gaps. Further, because of backlash between the door hangers 22 and the lintel 20, and between the gibs and the doorsill 26, the doors rattle, creating additional noise, as the car encounters aerodynamically induced vibration during travel. Referring now to Figure 2, a view taken along the line 2-2 is shown. A brush 32 is comprised of a metallic or plastic anchor 34 and a plurality of natural or artificial bristles 36 extending from the anchor, as is known in the art. The anchor is attached, by conventional means, such as screws 38, along a length of the trailing edge 30 of each door. The bristles extend from the trailing edge of each door towards the front panel 18 of the car. Each front panel has a bead 40 at the edge of the door opening 42. The bead extends towards and mates with the brush 32. The bead may be integral with the front panel (see Fig. 2) or may be attached thereto (see Fig. 3) by means of screws 44 or the like. To prolong the life of the brush, the bead extends beyond the surface of the front panel so that,over the length of travel of each door panel, the bristles 36 only contact the bead 40 when the door panel is in the closed position. As will be appreciated by one of ordinary skill in the art, the brush forms a labyrinth seal to minimize the leakage of noise to the interior of the cab. The brush also provides effective damping and spring forces between the doors and the front panel. The damping and spring forces minimize backlash which causes the car doors to rattle as the car encounters aerodynamically induced vibration loads during car travel thereby minimizing noise and vibration within the interior of the car. Although the invention has been shown and described with respect to an embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail thereof may be made without departing from the scope of the invention as claimed in the claims. Particularly, one of ordinary skill in the art would understand that the bead may be chamfered to minimize wear on the brushes as they engage and disengage the bead, that a seal may also be disposed at the upper edges of the door, and that the seal may be disposed upon the exterior surface of the car and the bead may be disposed upon the door edges.

Claims: Apparatus for minimizing noise and vibration in an elevator car (10), said car having an exterior (18), an interior, and a door (12), said door acting as a barrier to said interior and having a length of travel, said apparatus comprising: an elongate brush (32) extending along a dimension of said door (12), said brush extending from one of said door (12) or said exterior (18) of said car toward the other of said door or said exterior of said car and characterized by said brush having a spring force which is sufficient to resist the forces which act on the door transverse to the plane of the door during car travel for minimizing infiltration of noise through gaps between said door (12) and said exterior (18) and for minimizing backlash between said door and said exterior. Apparatus for minimizing noise and vibration in an elevator car (10), said car having an exterior (18), an interior, and a door (12), said door acting as a barrier to said interior and having a length of travel, said apparatus comprising: an elongate brush (32) extending along a dimension of said door (12), said brush extending from one of said door (12) or said exterior (18) of said car toward the other of said door or said exterior of said car and characterized by said brush providing an effective damping and spring force between the door and the car to reduce door rattle during car travel and for minimizing infiltration of noise through gaps between said door (12) and said exterior (18) and for minimizing backlash between said door and said exterior. The apparatus of claim 1 or 2 further comprising: means extending form said other of said door (12) or said exterior (18), for engaging said brush such that over the length of travel of said door said brush only engages said means when said door (12) is in the closed position to minimize wear of said brush. The apparatus of claim 3 wherein said means comprises: a bead (40) extending said from said other of said door or said exterior. The apparatus of claim 4 wherein the brush extends from the door and the bead extends from said car exterior.

Inventors: SALMON JOHN K, WORSLEY KEITH, YOO YOUNG S, SALMON, JOHN K., WORSLEY, KEITH, YOO, YOUNG S.
Applicants: OTIS ELEVATOR CO, OTIS ELEVATOR COMPANY
Application year: 1992
Main classification: B66B13
IPC codes: B66B11, B66B13