# US 5,701,973 A · Linear belt door operator

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- Number: US 5,701,973 A
- Document ID: US5701973A
- Status: Granted
- Kind: A
- Application number: 08/494,043
- Filed: 1995-06-23
- Granted: 1997-12-30
- Earliest claimed: 1995-06-23
- Assignees: Otis Elevator Company
- Inventors: Michael J. Tracey
- Web page: https://patentgrep.com/patent/US5701973A

## CPC

- B66B 13/08: guided for horizontal movement
- B66B: ELEVATORS; ESCALATORS OR MOVING WALKWAYS ({apparatus for raising or lowering persons on theatrical stages or the like A63J5/12} ; funicular railbound systems with rigid ground-supported tracks and cable traction, e.g. cliff railways, B61B9/00; arrangements of ammunition handlers in vessels B63G3/00; hoists, lifts, or conveyors for loading or unloading in general B65G; braking or detent devices controlling normal movements of winding drums or barrels B66D; ship-lifting devices E02C; garages for many vehicles with mechanical means for lifting vehicles E04H6/12; hoists for feeding ammunition or projectiles to launching apparatus or to loading mechanisms F41A9/00)

## Abstract

Disclosed is a door operator mounted in a space between a cab fascia and a sill edge plane. A feature of the door operator is a drive unit connected to a drive pulley, the drive unit being mounted in a central portion of the door operator, wherein the drive pulley provides a drive force to a linear transmission element. Another feature of the door operator is a modular mounting plate, wherein the door operator is mounted to the mounting plate, and in turn, the mounting plate is mounted in the space between the cab fascia and the sill edge plane.

## Claims

### Claim 1

In a doorway having a fascia, side edges, and a sill edge plane, a door operator for controlling the operation of a door between an open position and a closed position, said door disposed within a door plane, comprising:
a drive motor disposed in a space between said fascia and said sill edge plane, said drive motor having a drive shaft rotating in an axis parallel to said door plane and disposed intermediate said side edges of said doorway; and
means for connecting said drive motor to said door, including:
a right angle gear box disposed between the drive motor output shaft and a drive pulley, for transmitting rotational motion therebetween, said drive pulley having a rotational axis perpendicular to said door plane;
two stationary idler pulleys, each disposed adjacent one of each of said side edges;
a continuous drive belt, having a first horizontal section running between the first and second idler pulleys and wrapping partially around each, a second horizontal section running between the first idler pulley and the drive pulley, a third horizontal section running between the second idler pulley and an adjustable idler pulley, said belt intermediate said second and third horizontal sections wrapping partially around said adjustable idler pulley and partially around said drive pulley, and running therebetween;
means for securing said door to said belt; and
a mounting plate, secured to said drive motor and said drive pulley, said mounting plate disposed in a space defined by said fascia and said sill edge plane.

### Claim 2 (depends on 1)

The door operator as recited in claim 1, further comprising:
a second door, disposed in said door plane, said second door secured to said belt.