Edward Augustus Dempsey

US Patent:

46916857, Sep 8, 1987

Filed:

Jul 3, 1986

Appl. No.:

6/881637

Inventors:

Edward J. Dempsey - Huntington Beach CA

International Classification:

B28D 104
B23P 1900

US Classification:

125 14

Abstract:

A collar assembly is described, for use on a concrete cutter, which enables the major portion of the machine to be easily detached from a stuck sawblade and moved forwardly or rearwardly away from the blade so the blade can be cut out. The outer end of the shaft has a recess of the same diameter as the hole in the blade, and has a smaller threaded hole therein. The outer blade plate which lies on a face of the blade opposite the shaft, has a projecting collar that passes through the hole in the blade and into the recess in the face of the shaft, and a screw passing through the parts fastens them together.

US Patent:

40314375, Jun 21, 1977

Filed:

Jul 10, 1975

Appl. No.:

5/594584

Inventors:

Edward Justin Dempsey - Huntington Beach CA
David Earl Kent - La Mirada CA

Assignee:

Concrete Cutting Equipment Inc. - Hawthorne CA

International Classification:

G05B 1924

US Classification:

318 39

Abstract:

A control system for a cutting machine is disclosed in which the relative motion between a cutting tool, supported by a cutting motor, and the material to be cut is controlled by a feed motor. The cutting motor load level is continuously monitored and used to derive a load level signal which is related to the cutting motor load level and a desired cutting load level. The feed motor's forward speed is controlled to increase at a selected fixed rate until the cutting motor load level is substantially equal to the desired cutting load level. Whenever the cutting motor load level increases above the desired cutting load level, representing an overload condition, the speed of the feed motor in the forward direction is reduced at the rate of increase of the overload condition. If the cutting motor load level exceeds a threshold load level, the feed motor is driven in a reverse direction at a speed which increases or decreases at a rate related to the rate at which the cutting motor load level increases above or decreases toward said threshold load level.