Cam driven piston compressor

• US 8,011,897 B2
• Filed: 08/04/2006
• Issued: 09/06/2011
• Est. Priority Date: 08/05/2005
• Status: Active Grant

• Current Assignee: Cobham Mission Systems Davenport Lss Inc.
• Original Assignee: Carleton Life Support Systems, Inc. (Cobham PLC)
• Inventors: Mickelson, Sammy K, Raleigh, Timothy T.
• Primary Examiner(s): Kramer; Devon C
• Assistant Examiner(s): BERTHEAUD, PETER JOHN
• Application Number:
  US11/997,970
• Publication Number:
  US 20080219861A1
• Time in Patent Office: 1,859 Days
• Field of Search: 417/269, 417/271, 417/454, 417/415, 745/67
• US Class Current: 417/271
• CPC Class Codes: F04B 25/00 Multi-stage pumps
• CPC Class Codes: F04B 27/1054 Actuating elements
• CPC Class Codes: F04B 35/01 the means being mechanical
• CPC Class Codes: F04B 39/0094 crankshaft
• CPC Class Codes: F04B 9/042 the means being cams

Abstract

A cam driven piston compressor includes one or more cams powered by a motor, the cams being adapted to rotate through 360 degrees, and one or more cam followers, each of which is in contact with one of the cams. The compressor also includes one or more pistons wherein each of the pistons is attached to one of the cam followers, one or more cylinders wherein each of the cylinders encloses one of the pistons, and a compressor head in contact with the cylinders.

Claims

1. A cam driven piston compressor comprising:

a. three cams mounted on a cam shaft of a motor at an angle of 120°

relative to one another and powered by said motor and adapted to rotate in parallel planes;

b. a cam follower in contact with each of said cams;

c. a piston attached to each cam follower;

d. a cylinder enclosing each piston, wherein at least two of said cylinders are of different diameter; and

e. a compressor head in contact with each of said cylinders;

whereby each of said cams has a shape producing substantially 240°

of input rotation used to extend a respective said piston and substantially 120°

of output rotation used to retract a respective said piston.

2. The cam driven piston compressor set forth in claim 1 comprising a plurality of cam followers, a plurality of pistons, and a plurality of cylinders;

a. wherein said pluralities of cam followers, pistons, and cylinders are of like number.

3. The cam driven piston compressor set forth in claim 2 wherein the number of cylinders which would compress a gas at one time is equal to or greater than the number of cylinders that would not be compressing a gas.

4. The cam driven piston compressor set forth in claim 2 wherein each of said plurality of cam followers includes a rotatable bearing that contacts each of said plurality of cams.

5. The cam driven piston compressor set forth in claim 2 further including at least one spring contacting at least one cam follower for pressing said cam follower against a corresponding one of said plurality of cams.

6. The cam driven piston compressor set forth in claim 5 wherein said at least one spring comprises three springs.

7. The cam driven piston compressor set forth in claim 1 wherein said plurality of cams each has the same size and shape.