# US 2019/0167515 A1 · One-way self-locking device for massager

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- Number: US 2019/0167515 A1
- Document ID: US20190167515A1
- Status: Published application
- Kind: A1
- Application number: 16/313,888
- Filed: 2017-05-15
- Published: 2019-06-06
- Earliest claimed: 2017-05-15
- Assignees: Xiamen Comfier Technology Co., Ltd.
- Applicants: Xiamen Comfier Technology Co., Ltd.
- Inventors: Jianqing Li
- Web page: https://patentgrep.com/patent/US20190167515A1

## CPC

- A61H 23/004: {With mechanical drive, e.g. spring mechanism or vibrating unit being hit for starting vibration and then applied to the body of a patient}
- A61H 15/00: Massage by means of rollers, balls, e.g. inflatable, chains, or roller chains
- A61H 15/0078: {power-driven}
- A61H 23/006: {Percussion or tapping massage (hand percussion A61H23/06)}
- A61H 2015/0064: {with freely rotating spheres}
- A61H 2015/0071: {with balls or rollers having built-in vibrating means}
- A61H 2201/149: rotation-linear or vice versa
- A61H: PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY (electrotherapy, magnetotherapy, radiation therapy or ultrasound therapy A61N)

## Abstract

A one-way self-locking device for a massager includes a transmission shaft, a shaft sleeve, a torsional spring, and a big belt wheel. The big belt wheel is rotatably sleeved on the transmission shaft, and the big belt wheel is driven by a power mechanism to drive the transmission shaft to circumferentially rotate. The shaft sleeve is fixedly mounted on the transmission shaft. The torsional spring is sleeved on the shaft sleeve. A first connecting portion of the torsional spring is in interference fit with the shaft sleeve, a main body portion of the torsional spring is sleeved on the shaft sleeve and is in clearance fit with the shaft sleeve, and a second connecting portion of the torsional spring is fixedly connected to the big belt wheel to achieve one-way self-locking.

## Claims

### Claim 1

A one-way self-locking device for a massager, comprising a transmission shaft, a shaft sleeve, a torsional spring, and a big belt wheel; the transmission shaft being rotatably mounted in a housing of a massager, the big belt wheel being rotatably sleeved on the transmission shaft, the big belt wheel being driven by a power mechanism to drive the transmission shaft to rotate circumferentially, the transmission shaft driving a massage component to work through a deflection component; the shaft sleeve being fixedly mounted on the transmission shaft, the torsional spring being sleeved on the shaft sleeve, the torsional spring consisting of a main body portion and a first connecting portion and a second connecting portion that are disposed on two sides of the main body portion, the first connecting portion of the torsional spring being in a lapped connection with the shaft sleeve and being in interference fit with the shaft sleeve, the main body portion of the torsional spring being sleeved on the shaft sleeve and being in clearance fit with the shaft sleeve, the second connecting portion of the torsional spring being fixedly connected to the big belt wheel.

### Claim 2 (depends on 1)

The one-way self-locking device as claimed in claim 1, wherein the material of the torsion spring is a piano wire.

### Claim 3 (depends on 1)

The one-way self-locking device as claimed in claim 1, wherein the shaft sleeve is provided with a stop wall, and the first connecting portion of the torsion spring is axially limited to one side of the stop wall.

### Claim 4 (depends on 1)

The one-way self-locking device as claimed in claim 1, wherein the first connecting portion of the torsion spring has a U shape.

### Claim 5 (depends on 1)

The one-way self-locking device as claimed in claim 1, wherein the second connecting portion of the torsion spring is a hook portion, the hook portion is engaged on a protruding block of the big belt wheel, a screw is locked on the big belt wheel to limit and fix the second connecting portion of the torsion spring.