# US 4,979,245 A · Self-cleaning whirlpool system for bathtubs in general

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- Number: US 4,979,245 A
- Document ID: US4979245A
- Status: Granted
- Kind: A
- Application number: 07/339,751
- Filed: 1989-04-18
- Granted: 1990-12-25
- Earliest claimed: 1988-04-20
- Assignees: American Standard Inc.
- Inventors: Luigi Gandini
- Web page: https://patentgrep.com/patent/US4979245A

## CPC

- A61H 33/02: Bathing devices for use with gas-containing liquid, or liquid in which gas is led or generated, e.g. carbon dioxide baths {(A61H33/6026 takes precedence)}
- A61H 33/6073: {Intake mouths for recirculation of fluid in whirlpool baths}
- A61H 2033/0012: {by rinsing}
- A61H 2033/0016: {using cleansing products}
- 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 self-cleaning whirlpool system for spas, including bathtubs, is disclosed. The system comprises a circulating pump connected to a water intake pipe, a filter and a hydraulic circuit having nozzles for whirlpool massage. An air intake circuit is provided for mixing air into the water delivered to the nozzles. Valve means are provided to close the nozzles to form a closed circuit. Cleansing agent is metered into the closed circuit, together with water, and is circulated through the closed circuit by means of the circulating pump. After the closed circuit is cleansed, the dirty water and cleaning agent are drained off.

## Claims

### Claim 1

A self-cleaning system for use in conjunction with a whirlpool having a sump portion defined by walls having inner and outer surfaces, a drain conduit, and supply means for supplying water under pressure from a water main to the whirlpool, comprising:
an air intake circuit assembly and a hydraulic circuit assembly supported on the outer surface of said walls defining said sump portion;
a circulating pump operably coupled to said air intake and hydraulic circuit assemblies;
said hydraulic circuit assembly having a plurality of water jet discharge nozzles mounted in spaced-apart relation around said sump portion of said whirlpool;
said air intake circuit assembly having at least one air intake opening mounted to said whirlpool, said air intake circuit assembly having means to mix air into said hydraulic circuit assembly conducted through said water jet discharge nozzles;
first valve means coupled intermediate said supply means and said air intake and hydraulic circuit assemblies and displaceable between a whirlpool mode where water from said supply means is not directly introduced into said air intake and hydraulic circuit assemblies and a cleaning mode where water from said supply means is directly supplied under pressure into said air intake and hydraulic circuit assemblies;
second valve means operably coupled to said air intake circuit and hydraulic circuit assemblies and being mounted in juxtaposition, respectively, to said at least one air intake opening and each of said plurality of water jet nozzles, said second valve means being displaceable between said whirlpool mode where said at least one air intake opening and water jet nozzles are open to said sump portion of said whirlpool and a cleaning mode where said at least one air intake opening and water jet nozzles are closed to said sump portion of said whirlpool;
metering means coupled to said whirlpool to provide a predetermined amount of a cleansing agent into said air intake and hydraulic circuit assemblies when said first and second valve means are positioned in their cleaning mode so that a mixture of cleansing agent from said metering means and fresh water from said supply means is circulated by said pump through said air intake and hydraulic circuit assemblies for a predetermined period of time;
third valve means operatively coupled to said air intake and hydraulic circuit and the drain conduit and displaceable between a first position where said drain conduit is closed to said air intake and hydraulic circuit assemblies and a second position where said drain conduit is open to said air intake and hydraulic circuit assemblies to discharge said cleansing agent water mixture from said air intake and hydraulic circuit assemblies into said drain conduit;
a control unit operatively coupled to said first, second and third valve means, said metering means and said circulating pump, said control unit being electrically operative to selectively shift said first and second valve means from their whirlpool mode to their cleaning mode, and said third valve means from its first to its second position; and
switch means to actuate said control unit.

### Claim 2 (depends on 1)

The self-cleaning system in accordance with claim 1, wherein said metering means includes a pump unit having intake and outlet openings and whose intake opening is adapted to be operably coupled to a tank containing a cleansing agent, and a conduit is connected between the outlet opening of said pump unit of said metering means and said hydraulic circuit assembly so that said cleansing agent is metered in a predetermined quantity when said whirlpool is in its cleaning mode.

### Claim 3 (depends on 1)

The self-cleaning system in accordance with claim 1, wherein said circulating pump has an intake opening, further including a fourth valve which is mounted between the intake opening of said circulating pump and said drain conduit.

### Claim 4 (depends on 1)

The self-cleaning system in accordance with claim 1, further including a breather tube mounted between said drain conduit and said hydraulic circuit, and a fifth valve coupled to said hydraulic circuit and to one end of said breather tube.

### Claim 5 (depends on 1)

The self-cleaning system in accordance with claim 1, wherein said hydraulic circuit assembly includes a water filter and filter valve means, which are operatively coupled downstream of said circulating pump and upstream of said drain conduit when said system is in said cleaning mode.

### Claim 6 (depends on 1)

The self-cleaning system in accordance with claim 1, wherein said control unit is operatively coupled to said at least one air intake opening and said plurality of said water jet discharge nozzles to shift said second valve means from its normal whirlpool mode to its cleaning mode.

### Claim 7 (depends on 1)

The self-cleaning system in accordance with claim 1, where said second valve means includes a pneumatically operated valve for opening and closing said water jet nozzles and a manually operated valve for opening and closing said at least one air intake opening.

### Claim 8 (depends on 1)

The self-cleaning system in accordance with claim 1, wherein said control unit includes program means to automatically shift said whirlpool from its normal whirlpool mode to its cleaning mode.