# US 4,718,408 A · Variable massage apparatus having a clutch selectively engaging alternate gears

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- Number: US 4,718,408 A
- Document ID: US4718408A
- Status: Granted
- Kind: A
- Application number: 06/857,187
- Filed: 1986-04-29
- Granted: 1988-01-12
- Earliest claimed: 1986-04-29
- Inventors: Armando Barreiro
- Web page: https://patentgrep.com/patent/US4718408A

## CPC

- A61H 1/00: Apparatus for passive exercising (A61H5/00 takes precedence); Vibrating apparatus; Chiropractic devices, e.g. body impacting devices, external devices for briefly extending or aligning unbroken bones
- A61H 7/007: {Kneading}
- A61H 15/0078: {power-driven}
- A61H 15/00: Massage by means of rollers, balls, e.g. inflatable, chains, or roller chains
- A61H 37/00: Accessories for massage
- A61H 2015/0028: {disc-like, i.e. diameter substantially greater than width}
- A61H 2201/0138: incorporated in furniture
- A61H 2201/0149: Seat or chair
- A61H 2201/1427: Wobbling plate
- A61H 2201/1623: Back
- A61H 2201/1654: Layer between the skin and massage elements, e.g. fluid or ball
- A61H 2201/1669: moving along the body in a reciprocating manner
- A61H 2205/081: Back
- 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

An apparatus for massaging mountable behind the back of a chair and capable of being moved vertically to provide relaxing massage to a user sitting on the chain. A reversible motor mechanism provides the rotational motion to a clutch assembly that selectively engages one of two gear assemblies that in turn activate two different linkage and reciprocating mechanisms that simulate or follow the movements of the fingers of a conventional masseur.

## Claims

### Claim 1

A massage apparatus mountable behind the back of a chair, comprising:
A. a flat horizontal platform;
B. vertically extending guiding means mounted perpendicularly to said platform;
C. motor means mounted on said platform including a shaft that is disposed in parallel to said guiding means;
D. a massage mechanism unit slidably mounted over said guiding means and including two sets of gears and clutch means for transmitting the rotation of said shaft and for selectively engaging one of said sets of gears depending on the direction of rotation of the shaft of said motor means and said clutch means further including a clutch member of cylindrical shape and having an external thread and a cylindrical clutch housing coaxially housing said clutch member, said housing including an internal thread compatible with said external thread thereby allowing said clutch member to longitudinally travel inside said housing to engage one of said two gears connected to said shaft member;
E. two shaft members rigidly connected to each one of said gears;
F. linkage means having two ends and said linkage means being pivotally mounted to said two shaft members on one end and further including each of said linkage means having at least one rubber wheel rotatably mounted at the other end so that the rotation of said gears impart a predetermined reciprocating movement to the ends having said wheels mounted thereon and said wheels positioned in the area behind the back of said chair so that said unit may travel up and down the spine of a user.

### Claim 2 (depends on 1)

The apparatus set forth in claim 1 wherein said clutch member has two ends each having a plurality of teeth longitudinally disposed and said two shafts include cooperating teeth to engage said clutch member.