Larry D Plunkett

US Patent:

7622876, Nov 24, 2009

Filed:

Jul 31, 2006

Appl. No.:

11/461170

Inventors:

Larry Plunkett - Vernon Hills IL, US
Greg Kolacinski - Capron IL, US

Assignee:

Danaher Motion, LLC - Marengo IL

International Classification:

H02P 1/04

US Classification:

318430, 318432, 31840009, 361 23, 361 26

Abstract:

A method, apparatus or computer program implements an overload prevention approach involving monitoring a speed of a motor; detecting an overload condition of the motor based on the monitored speed; and controlling an operation of the motor according to the detected overload condition.

US Patent:

41888588, Feb 19, 1980

Filed:

May 11, 1978

Appl. No.:

5/904774

Inventors:

Larry D. Plunkett - Crystal Lake IL

Assignee:

Signode Corporation - Glenview IL

International Classification:

F15B 1520
F01B 1102

US Classification:

91392

Abstract:

A warning system for pneumatic fastener driving tools that acceptable bumper deterioration has been exceeded thereby to warn against further use of a tool prior to replacement of the bumper. A piston carrying a driver blade moves from an upper position of rest to lower fastener driven positions. The piston sealingly engages the cylinder wall via a sealing ring. As the bumper deteriorates, the piston moves to lower and lower fastener driven positions. When the piston reaches a predetermined lower position, the effectiveness of the sealing ring is impaired, as by engagement with a notch or edge which tends to destroy or dislodge the sealing ring. This allows high pressure air to escape past the sealing ring to signal that the bumper should be replaced, as by seriously reducing the effectiveness or operability of the tool or as by producing an audible signal by the escaping high pressure air, or both.