# US 5,350,049 A · Wear resistant safety coating for people moving device treadplates

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- Number: US 5,350,049 A
- Document ID: US5350049A
- Status: Granted
- Kind: A
- Application number: 08/092,173
- Filed: 1993-07-15
- Granted: 1994-09-27
- Earliest claimed: 1993-07-15
- Assignees: Otis Elevator Company
- Inventors: Hermann W. Ahls; Michael Kruse; Peter Borchers
- Web page: https://patentgrep.com/patent/US5350049A

## CPC

- B66B 23/12: Steps
- 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

A treadplate for a people moving device is provided having a tread surface with a plurality of ribs extending out from the tread surface, and a wear resistant polymeric coating, having a color, bonded to the treadplate. The polymeric coating being made of a thermal setting plasticized polyvinylchloride plastic.

## Claims

### Claim 1

A treadplate for conveying passengers in a passenger conveying device, comprising:
a tread surface, having a body defined by a width and a length, wherein said length extends in the direction of travel of said treadplate; and
a wear resistant coating, bonded to said tread surface, said coating comprising a thermal setting plasticized polyvinylchloride plastic.

### Claim 2 (depends on 1)

A treadplate for a passenger conveying device according to claim 1, wherein said tread surface further comprises:
a plurality of ribs, extending out from said body and lengthwise across said tread surface, wherein each said rib includes a body defined by a pair of side surfaces and a top surface, said top surface positioned to permit contact with a passenger;
wherein said wear resistance coating is bonded to said side surfaces of said ribs and said body of said tread surface.

### Claim 3 (depends on 2)

A treadplate for a passenger conveying device according to claim 2, wherein said wear resistant coating is bonded to said top surfaces of said ribs, and therefore positioned to permit contact with said passengers.

### Claim 4

A passenger conveying device, comprising:
a plurality of treadplate for conveying passengers within said passenger conveying device, wherein each said treadplate comprises:
a tread surface, having a body defined by a width and a length, wherein said length extends in the direction of travel of said treadplate; and
a wear resistant coating, bonded to said tread surface, said coating comprising a thermal setting plasticized polyvinylchloride plastic.

### Claim 5 (depends on 4)

A passenger conveying device according to claim 4, wherein said tread surface further comprises:
a plurality of ribs, extending out from said body and lengthwise across said tread surface, wherein each said rib includes a body defined by a pair of side surfaces and a top surface, said top surface positioned to permit contact with a passenger;
wherein said wear resistant coating is bonded to said side surfaces of said ribs and said body of said tread surface.

### Claim 6 (depends on 5)

A passenger conveying device according to claim 5, wherein said wear resistant coating is bonded to said top surfaces of said ribs, and therefore positioned to permit contact with said passengers.

### Claim 7

An escalator, comprising:
a plurality of steps for conveying passengers, wherein each said step comprises:
a tread surface, having a body defined by a width and a length, wherein said length extends in the direction of travel of said step; and
a wear resistant coating, bonded to said tread surface, said coating comprising a thermal setting plasticized polyvinylchloride plastic.

### Claim 8 (depends on 7)

An escalator according to claim 7, wherein said tread surface further comprises:
a plurality of ribs, extending out from said body and lengthwise across said tread surface, wherein each said rib includes a body defined by a pair of side surfaces and a top surface, said top surface positioned to permit contact with a passenger;
wherein said wear resistant coating is bonded to said side surfaces of said ribs and said body of said tread surface.

### Claim 9 (depends on 8)

A passenger conveying device according to claim 8, wherein said wear resistant coating is bonded to said top surfaces of said ribs, and therefore positioned to permit contact with said passengers.