# US 2025/0052261 A1 · Hydraulic actuator

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- Number: US 2025/0052261 A1
- Document ID: US20250052261A1
- Status: Published application
- Kind: A1
- Application number: 18/718,929
- Filed: 2022-10-11
- Published: 2025-02-13
- Earliest claimed: 2021-12-17
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Shingo OONO
- Web page: https://patentgrep.com/patent/US20250052261A1

## CPC

- F15B 15/103: {using inflatable bodies that contract when fluid pressure is applied, e.g. pneumatic artificial muscles or McKibben-type actuators}
- B25J 9/142: {comprising inflatable bodies}
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- B25J: MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES ({manipulators specially adapted for use in surgery A61B34/70; manipulators used in cleaning hollow articles B08B9/04}; manipulators associated with rolling mills B21B39/20; manipulators associated with forging machines B21J13/10; {manipulators associated with picking-up and placing mechanisms B23P19/007}; means for holding wheels or parts thereof B60B30/00; {vehicles with ground-engaging propulsion means, e.g. walking members B62D57/02, B62D57/032; devices for picking-up and depositing articles or materials between conveyors B65G47/90, B65G47/91; manipulators with gripping or holding means for transferring packages B65H67/065}; cranes B66C; {manipulators used in the protection or supervision of pipe-line installations F17D5/00; walking equipment adapted for nuclear steam-generators F22B37/006}; manipulators specially adapted for, or associated with, nuclear reactors G21C; {apparatus used for handling wafers during manufacture or treatment of semiconductor H10P72/50})

## Abstract

A hydraulic actuator includes a tube capable of being expanded and contracted by fluid pressure, a sleeve that is a structural member made of woven fiber cords directed in predetermined directions to exert stretchability and covers an outer circumferential surface of the tube, a sealing member that seals each end of the tube in an axial direction thereof, and a restraint member that is provided at a part of a circumference of the tube to extend from one end to another end of the tube in the axial direction and restraints an elongation of the part of the circumference of the tube in the axial direction. The predetermined directions in which the fiber cords of the sleeve are directed are oriented such that the tube elongates when expanded. The restraint member is woven into the sleeve to be integrated therewith, or disposed between the sleeve and the tube.

## Claims

### Claim 1

A hydraulic actuator comprising:
a tube capable of being expanded and contracted by fluid pressure;
a sleeve that is a structural member made of woven fiber cords directed in predetermined directions to exert stretchability and covers an outer circumferential surface of the tube; and
a sealing member that seals each end of the tube in an axial direction thereof,
wherein the predetermined directions in which the fiber cords of the sleeve are directed are oriented such that the tube elongates when expanded,
wherein the hydraulic actuator further comprises a restraint member that is provided at a part of a circumference of the tube to extend from one end to another end of the tube in the axial direction and restraints an elongation of the part of the circumference of the tube in the axial direction.

### Claim 2 (depends on 1)

The hydraulic actuator according to claim 1, wherein the restraint member is woven into the sleeve to be integrated therewith.

### Claim 3 (depends on 1)

The hydraulic actuator according to claim 1, wherein the restraint member is disposed between the sleeve and the tube.

### Claim 4 (depends on 2)

The hydraulic actuator according to claim 2,
wherein the restraint member includes a restraint fiber cord.

### Claim 5 (depends on 4)

The hydraulic actuator according to claim 4,
wherein the restraint member includes a plurality of restraint fiber cords that cross each other.