# US 2024/0201628 A1 · Functional mechanical part

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- Number: US 2024/0201628 A1
- Document ID: US20240201628A1
- Status: Published application
- Kind: A1
- Application number: 18/366,825
- Filed: 2023-08-08
- Published: 2024-06-20
- Earliest claimed: 2022-12-19
- Assignees: The Swatch Group Research and Development Ltd
- Applicants: The Swatch Group Research and Development Ltd
- Inventors: Christophe VINCENT; Adrien CORNILLE
- Web page: https://patentgrep.com/patent/US20240201628A1

## CPC

- G04B 13/02: Wheels; Pinions; Spindles; Pivots (bearings G04B31/00 {; chain wheels, spindles for chain wheels, also chains and driving weights G04B1/08})
- G04B 15/14: Component parts or constructional details, e.g. construction of the lever or the escape wheel {(assembly and manufacture of the spring G04B1/145; assembly and manufacture of components, e.g. pinions, spindles G04B13/02; lubrication of clockwork bearings G04B31/008; oils for clockwork bearings in general G04B31/08)}
- C08G 63/672: Dicarboxylic acids and dihydroxy compounds
- F16H 55/00: Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms (of screw-and-nut gearing F16H25/00)
- G04B: MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at pre-selected times or after predetermined time intervals G04C23/00; clocks or watches with stop devices G04F7/08)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- F16H: GEARING

## Abstract

A mechanical part (2, 3) including a functional surface intended to come into frictional contact with another functional surface, wherein the functional surface of the mechanical part (2, 3) is made of polyethylene furanoate.

## Claims

### Claim 1

A mechanical part of a horological movement, which part comprises a functional surface configured to come into frictional contact with another functional surface, wherein said functional surface of the mechanical part is made of polyethylene furanoate.

### Claim 2 (depends on 1)

The mechanical part according to claim 1, wherein the entire mechanical part is made of polyethylene furanoate.

### Claim 3 (depends on 1)

The mechanical part according to claim 1, wherein the mechanical part is a pallet, an escape wheel, an arbor of a wheel set, a bearing, a mainspring or toothings of gear wheels.

### Claim 4 (depends on 1)

A functional assembly comprising the mechanical part according to claim 1 and another mechanical part comprising the other functional surface to be in frictional contact with the functional surface of said mechanical part, wherein at least the other functional surface of the other mechanical part is made of a material selected from polyethylene furanoate, ruby and steel.

### Claim 5 (depends on 1)

The functional assembly according to claim 1, wherein the frictional contact is lubricated.

### Claim 6 (depends on 1)

The functional assembly according to claim 1, wherein the frictional contact is lubricated using an oil.