# US 11,111,108 B2 · Coated sheave

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- Number: US 11,111,108 B2
- Document ID: US11111108B2
- Status: Granted
- Kind: B2
- Application number: 15/971,211
- Filed: 2018-05-04
- Published: 2019-11-07
- Granted: 2021-09-07
- Earliest claimed: 2018-05-04
- Assignees: Otis Elevator Company
- Applicants: Otis Elevator Company
- Inventors: Xiaoyuan Chang; David R. Torlai
- Web page: https://patentgrep.com/patent/US11111108B2

## CPC

- B66B 15/04: Friction sheaves; "Koepe" pulleys
- C09D 191/06: Waxes
- C25D 3/04: of chromium
- 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)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

An elevator sheave includes a sheave body and a coating on a surface of the sheave body. The coating includes microcracks and a filler in the microcracks. A method of making a sheave for an elevator system is also disclosed.

## Claims

### Claim 1

An elevator system, comprising:
an elevator sheave, the elevator sheave including:
a sheave body,
a coating on a surface of the sheave body, the coating including microcracks,
a filler in the microcracks; and
a load bearing assembly at least partially wrapped around the elevator sheave such that the load bearing assembly is in a friction relationship with the coating on the sheave, wherein the load bearing assembly includes a jacket, the jacket comprising a polymer, wherein the filler is inert to the polymer, and wherein the filler comprises a material and the jacket comprises the material.

### Claim 2 (depends on 1)

The elevator sheave of claim 1, wherein the filler comprises a wax.

### Claim 3 (depends on 1)

The elevator sheave of claim 1, wherein the coating is a hard chrome coating.

### Claim 4 (depends on 3)

The elevator sheave of claim 3, wherein the hard chrome coating is plated onto the sheave.

### Claim 5 (depends on 1)

The elevator system of claim 1, wherein the jacket comprises at least one of a thermoplastic elastomer polymer, a thermosetting elastomer polymer, and a rubber polymer.

### Claim 6 (depends on 1)

The elevator system of claim 1, wherein the filler comprises a wax and the jacket includes the wax.

### Claim 7 (depends on 1)

The elevator system of claim 1, wherein:
the jacket comprises a polyurethane;
the polyurethane comprises wax additives; and
the filler comprises at least one of the wax additives.