# US 5,346,370 A · Portable pumping system with generator powered clutch assembly

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,346,370 A
- Document ID: US5346370A
- Status: Granted
- Kind: A
- Application number: 08/149,051
- Filed: 1993-11-08
- Granted: 1994-09-13
- Earliest claimed: 1993-11-08
- Assignees: Graco Inc.
- Inventors: Duane D. Krohn
- Web page: https://patentgrep.com/patent/US5346370A

## CPC

- F16D 27/112: with flat friction surfaces, e.g. discs
- F04B 49/02: Stopping, starting, unloading or idling control
- H02K 7/10: Structural association with clutches, brakes, gears, pulleys or mechanical starters
- F04B 2205/05: Pressure after the pump outlet
- F16D 2027/002: {Electric or electronic circuits relating to actuation of electromagnetic clutches}
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A liquid pumping system adaptable for connection to either an electrical drive motor or an internal combustion engine, wherein a generator and clutch is coupled to the driving source, and a pressure sensing switch is connected to the generator rotor to selectively provide voltage to a rectifier circuit and field winding for the clutch. The energization of the field winding causes the clutch to actuate and thereby causes a mechanical coupling to a reciprocable pump for developing liquid pressure.

## Claims

### Claim 1

A portable spraying system adapted for interchangeable power sources, comprising:
a) a cart having an upper platform for attachment of a pumping assembly and a lower platform for removable attachment of a power source;
b) a clutch housing attached to said upper platform, said clutch housing having a projecting drive shaft extending over said lower platform, said drive shaft having a drive pulley thereon;
c) a pump housing attached to said clutch housing, said pump housing having an input drive gear and means for actuating a liquid pump;
d) a pinion shaft mounted in said clutch housing in axial alignment with said drive shaft, with said pinion shaft extending outwardly from said clutch housing to engage said input drive gear;
e) a clutch plate affixed to said drive shaft in said clutch housing, and a clutch armature slidably mounted to said pinion shaft;
f) a generator stator affixed inside said clutch housing and a generator rotor attached to said drive shaft and to said clutch plate; and
g) means for deriving electrical energy from said generator stator for magnetically actuating said armature into contact against said clutch plate.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein said means for deriving electrical energy further comprises a pressure sensor and bridge circuit, and electrical connection from said generator stator to said pressure sensor, and electrical connection from said pressure sensor to said bridge circuit, and a field winding about said clutch plate, said field winding electrically connected to said bridge circuit.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein said pressure sensor further comprises a movable pressure-responsive member in liquid flow communication with said pump, and a switch actuator in contact with said pressure-responsive member.

### Claim 4 (depends on 1)

The apparatus of claim 1, further comprising an axial bore in said pinion shaft end in said clutch housing, and an end of said drive shaft rotatably seated in said axial bore.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein said pinion shaft further comprises an enlarged surface portion in said clutch housing, said enlarged surface portion having a plurality of axially extending splines uniformly arranged about said surface portion; and said clutch armature further comprises a central opening having a plurality of teeth sized for slidable engagement with said surface.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein said magnetic clutch plate further comprises an annular recess facing said clutch armature, and a cork material filling said recess.

### Claim 7 (depends on 5)

The apparatus of claim 5, further comprising a passage in said pinion shaft between said axial bore and a pinion shaft end outside said clutch housing.

### Claim 8

A portable spraying system adapted for connection to either an electric motor driving source or an internal combustion engine driving source, comprising:
a) a cart having a frame portion for receiving a driving source and a frame portion for receiving a pump;
b) a first housing affixed to said frame portion for receiving a pump, said first housing having a drive shaft and pulley extending from a first end at a position elevated above said frame portion for receiving a drive source;
c) a generator stator and rotor in said first housing, said rotor affixed to said drive shaft and said stator affixed to said first housing;
d) a clutch plate affixed to said generator rotor, and a fixed field coil adjacent said clutch plate;
e) a pinion shaft extending from a second end of said first housing in alignment with said drive shaft, said pinion shaft having a toothed surface inside said first housing and a central bore aligned with said drive shaft, said central bore receiving an end of said drive shaft;
f) a clutch armature having a central toothed opening slidably engageable to said enlarged toothed surface, and slidable into contact against said clutch plate;
g) a pump drive housing affixed to said first housing and having a drive gear engageable with said pinion shaft, and having a pump drive shaft connected to said drive gear; and
h) a liquid pump connected to said pump drive shaft.

### Claim 9 (depends on 8)

The apparatus of claim 8, further comprising a second housing affixed to said first housing, said second housing having electrical circuit means for energizing said field coil, said electrical circuit means having an input connected to said generator stator.

### Claim 10 (depends on 9)

The apparatus of claim 9, wherein said clutch plate further comprises an annular groove facing said armature and a cork material filling said annular groove.

### Claim 11 (depends on 9)

The apparatus of claim 9, wherein said electrical circuit means further comprises a pressure-responsive switch means for connecting to said pump.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein said pinion central bore further comprises at least one bearing for supporting said end of said drive shaft.

### Claim 13 (depends on 12)

The apparatus of claim 12, further comprising a passage in said pinion extending from said central bore to an end of said pinion shaft extending from said first housing.

### Claim 14 (depends on 13)

The apparatus of claim 13, wherein said pump further comprises a reciprocable pump.

### Claim 15 (depends on 14)

The apparatus of claim 14, wherein said electrical circuit means further comprises a pressure-responsive switch means for connecting to said pump.