# US 5,343,777 A · Eccentric crank assembly for a reciprocating piston air compressor

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- Number: US 5,343,777 A
- Document ID: US5343777A
- Status: Granted
- Kind: A
- Application number: 07/862,331
- Filed: 1992-04-02
- Granted: 1994-09-06
- Earliest claimed: 1992-04-02
- Assignees: DeVilbiss Air Power Company
- Inventors: Mark W. Wood; Brian M. Steurer
- Web page: https://patentgrep.com/patent/US5343777A

## CPC

- F16C 3/12: releasably connected
- F04B 39/0094: {crankshaft}
- F16B 7/22: using hooks or like elements
- Y10T 74/2173: Cranks and wrist pins
- Y10T 74/2177: Sectional
- Y10T 403/5793: including member wedging or camming means
- Y10T 403/66: Interfitted members with external bridging piece
- Y10T 403/7056: Threaded actuator
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- 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)
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention is directed to an improved eccentric crank assembly for a reciprocating piston type air compressor. The eccentric crank assembly includes an eccentric plate, a compressor shaft, and an eccentric shaft. The eccentric plate is provided with a pair of parallel overlapping openings formed therethrough. The compressor shaft includes one end provided with a flat angled surface, and the eccentric shaft includes one end provided with a corresponding flat angled surface. The angled surface ends of the shafts are disposed within the openings of the plate. When the eccentric shaft is moved away from the compressor shaft, the angled flat surfaces force the shafts radially apart and into engagement with the openings of the eccentric plate, thereby locking the shafts and the eccentric plate together.

## Claims

### Claim 1

An eccentric crank assembly for a reciprocating-piston device comprising:
an eccentric plate having a pair of parallel overlapping openings formed therethrough;
a drive shaft having one end disposed in one of said openings of said eccentric plate, said one end of said drive shaft including a generally flat surface angled inwardly toward an opposite end thereof;
an eccentric shaft having one end disposed in the other of said openings of said eccentric plate, said one end of said eccentric shaft including a generally flat surface angled inwardly toward an opposite end thereof; and
means causing said generally flat surface of said drive shaft and said generally flat surface of said eccentric shaft to cooperate with one another to urge said drive shaft and said eccentric shaft radially away from one another and into engagement with said openings of said eccentric plate, thereby connecting said eccentric plate, said drive shaft, and said eccentric shaft together.

### Claim 2 (depends on 1)

An eccentric crank assembly as defined in claim 1, wherein said means causing said generally flat surfaces to cooperate includes threads provided on said opposite end of said eccentric shaft and a threaded nut secured thereon, said threaded nut adapted to be rotated in a direction causing of said drive shaft whereby said angled generally flat said eccentric shaft to move axially away from said one end surfaces urge said drive shaft and said eccentric shaft radially apart and into engagement with said openings of said eccentric plate.

### Claim 3 (depends on 1)

An eccentric crank assembly as defined in claim 1, and further including means provided on one of said generally flat surfaces for connecting said shafts and said eccentric plate together in a generally centered position within said eccentric plate.

### Claim 4 (depends on 1)

An eccentric crank assembly as defined in claim 1, wherein said generally flat surface on said one end of said drive shaft is bifurcated to form a double angled flat surface thereon having an apex defined between the two angled flat surfaces to extend perpendicular to the axis of said drive shaft and having a location which is in a generally centered position within said eccentric plate and wherein said apex contacts said generally flat surface on said eccentric shaft.

### Claim 5 (depends on 1)

An eccentric crank assembly as defined in claim 1, wherein said generally flat surface on said one end of said eccentric shaft is bifurcated to form a double angled flat surface thereon having an apex defined between the two angled flat surfaces to extend perpendicular to the axis of said eccentric shaft and having a location which is in a generally centered position within said eccentric plate and wherein said apex contacts said generally flat surface on said drive shaft.

### Claim 6

An eccentric crank assembly for a reciprocating-piston device comprising:
an eccentric plate having a pair of parallel. overlapping openings formed therethrough;
a drive shaft having one end disposed in one of said openings of said eccentric plate;
an eccentric shaft having one end disposed in the other of said openings of said eccentric plate;
at least one of said openings in said eccentric plate defining at least two spaced apart tangs extending parallel to the axis of such opening; and means for urging said drive shaft and said eccentric shaft radially away from one another and into engagement with said openings of said eccentric plate, thereby connecting said eccentric plate, said drive shaft, and said eccentric shaft together; and wherein the shaft in said at least one opening is urged into contact with the tangs in such opening to orient such shaft parallel to the axis of such opening.

### Claim 7 (depends on 6)

An eccentric crank assembly as defined in claim 6, wherein each of said openings in said eccentric plate is provided with at least two spaced apart tangs extending parallel to the axes of said openings.