# US 2014/0154117 A1 · Diaphragm pump

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- Number: US 2014/0154117 A1
- Document ID: US20140154117A1
- Status: Published application
- Kind: A1
- Application number: 14/131,901
- Filed: 2012-07-11
- Published: 2014-06-05
- Earliest claimed: 2011-07-11
- Assignees: Okenseiko Co., Ltd.
- Inventors: Tadashi Fukami
- Web page: https://patentgrep.com/patent/US20140154117A1

## CPC

- F04B 43/026: {each plate-like pumping flexible member working in its own pumping chamber}
- F04B 45/04: having plate-like flexible members, e.g. diaphragms (F04B45/10 takes precedence)
- F16H 23/04: with non-rotary wobble-members
- 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)
- F16H: GEARING

## Abstract

This invention provides a diaphragm pump that decreases the number of components or improves workability in assembling. A crank (4) to which the output shaft (2a) of a motor (2) is pivotally attached has, in its upper surface, a ring-shaped insertion groove (5) with respect to the output shaft (2a) as the center. A projecting driving shaft (9b) is formed integrally with a driver (7). When the lower end (9c) of the driving shaft (9b) is inserted into the insertion groove (5), the axis (9d) tilts. When the crank (4) rotates, an engaging portion provided in the insertion groove (5) engages with the lower end (9c). The driving shaft (9b) rotates while changing the tilt direction of the axis (9d) following the rotation of the crank (4). Hence, when a diaphragm portion (12a) attached to the drive element (7a) of the driver (7) moves upward/downward, a pump chamber (18) expands/contracts so that a pump action is obtained.

## Claims

### Claim 1

A diaphragm pump comprising:
a motor serving as a driving source;
a crank that is rotated by said motor and has a ring-shaped insertion groove in an upper surface;
a pump chamber that is formed from a diaphragm including a diaphragm portion and expands/contracts in accordance with reciprocal motion of said diaphragm portion;
a driver that reciprocally moves said diaphragm portion by an oscillation operation;
a driving shaft that projects from said driver and engages with said insertion groove of said crank with respect to a rotation axis of said crank as a center; and
an engaging portion that is formed in said insertion groove, and engages with said driving shaft to make said driving shaft follow the rotation of said crank,
wherein said driving shaft and said driver are integrally formed from a single material or different materials.

### Claim 2 (depends on 1)

A diaphragm pump according to claim 1, wherein said driving shaft and said driver are integrally formed from a resin.

### Claim 3 (depends on 1)

A diaphragm pump according to claim 1, wherein said driving shaft and said driver are made of a metal and a resin, respectively, and integrally molded.

### Claim 4 (depends on 1)

A diaphragm pump according to claim 1, further comprising:
a ring-shaped insertion groove that is formed in the upper surface of said crank with respect to the rotation axis of said crank as the center and receives said driving shaft; and
an engaging portion that is formed in said insertion groove, and engages with said driving shaft to make said driving shaft follow the rotation of said crank.

### Claim 5 (depends on 4)

A diaphragm pump according to claim 4, further comprising:
a conical guide portion that is formed on the upper surface of said crank surrounded by said insertion groove and guides said driving shaft into said insertion groove.

### Claim 6 (depends on 5)

A diaphragm pump according to claim 5, further comprising:
an oscillation fulcrum shaft that projects from said driver to a side opposite to said driving shaft coaxially with respect to said driving shaft;
a cylindrical holder member that holds said pump chamber; and
a bearing portion of said oscillation fulcrum shaft formed on said holder member.

### Claim 7

(canceled)