Arthur Michaud

US Patent:

41966554, Apr 8, 1980

Filed:

Jan 12, 1976

Appl. No.:

5/648372

Inventors:

Louis H. LeBlanc - Claremont NH
Arthur A. Michaud - Claremont NH

Assignee:

Joy Manufacturing Company - Pittsburgh PA

International Classification:

F16J 104

US Classification:

92233

Abstract:

A fluid motor and more particularly a fluid motor having an improved piston head structure.

US Patent:

49571710, Sep 18, 1990

Filed:

Apr 24, 1989

Appl. No.:

7/341777

Inventors:

Ward D. Morrison - Claremont NH
Arthur A. Michaud - Claremont NH

Assignee:

Cannon Industries, Inc. - Claremont NH

International Classification:

B25D 918

US Classification:

173104

Abstract:

A pneumatic rock drill which has a pneumatic percussion unit with a piston which slidably engages the cylinder in which it reciprocates. Preferably clearances of less than less than about 0. 00125 inches per inch of piston diameter and greater than about 0. 00075 inches where clearances are diameter are maintained to assure a fluid film between the piston and the cylinder wall. The clearances are based on diameters. The piston of the pneumatic drill has at least one stem section which slidably engages a distributor. The rock drill has a pneumatic motor connected to the percussion unit and engages a distributor of the percussion unit. An air motor gear in the pneumatic motor is rotatably mounted on the distributor. The exhaust is employed to lubricate the bearings and gearing which turn the striker bar.

US Patent:

50406183, Aug 20, 1991

Filed:

Aug 13, 1990

Appl. No.:

7/566112

Inventors:

Ward D. Morrison - Claremont NH
Arthur A. Michaud - Claremont NH

Assignee:

Cannon Industries, Inc. - Claremont NH

International Classification:

B25D 918

US Classification:

173104

Abstract:

A pneumatic rock drill which has a pneumatic percussion unit with a piston which slidably engages the cylinder in which it reciprocates. Preferably clearances of less than less than about 0. 00125 inches per inch of piston diameter and greater than about 0. 00075 inches where clearances are diameter are maintained to assure a fluid film between the piston and the cylinder wall. The clearances are based on diameters. The piston of the pneumatic drill has at least one stem section which slidably engages a distributor. The rock drill has a pneumatic motor connected to the percussion unit and engages a distributor of the percussion unit. A air motor gear in the pneumatic motor is rotatably mounted on the distributor. The exhaust is employed to lubricate the bearings and gearing which turn the striker bar.