David T Aberle275 S Harrison St UNIT 103, Denver, CO 80209

6102312, Aug 15, 2000

Jun 17, 1999

9/335429

David H. Aberle - Arvada CO

B02C 1304
B02C 2102

241101742

A rotary hammer mill for breaking, cutting and crushing frangible or fracturable solid materials. The hammer is formed by a shaft rotatable about a horizontal, longitudinal axis. A plurality of swinging hammers are aligned along the shaft and each is positioned in a separate vertical plane for partial swinging movement about its own pivot axis parallel to and spaced from the shaft axis. The hammer mill is adapted for mounting on a self-propelled, dirigible vehicle and is capable of breaking, cutting and crushing a wide variety of materials.

5558187, Sep 24, 1996

Jun 7, 1995

8/486896

David H. Aberle - Arvada CO

F16D 5706

188292

A brake apparatus for a rotating shaft. The apparatus comprises a fluid-tight housing in which is disposed a shaft rotational engagement gear having an exteriorly-accessible portion thereof rotatably engageable with a shaft. A plurality of compartments are formed by a plurality of walls within the housing, and the compartments are in fluid communication with each other through openable and closable valves. The housing is substantially filled with a fluid which is flowable through the valves in direct relation to the openness of the valves. A plurality of compartment-divider rotational gears are disposed inside the housing. These compartment-divider gears are rotatably engaged with the shaft rotational gear and are situated in cooperation with the walls forming the compartments to create at their respective sites restriction seals between the compartments. Upon activation, the brake apparatus operates through closure of the valves, thereby retarding the flow of fluid amongst the plurality of compartments and initially increasing fluid pressure. The initially increased fluid pressure slows the gears which, in turn, slow the velocity of a rotating shaft rotatably engaged with the rotational engagement gear and simultaneously gradually decreases fluid pressure.