Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Patent
1994-04-28
1995-08-08
Bagnell, David J.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
173 28, 4041331, E01C 2312, E21C 2712
Patent
active
054392730
ABSTRACT:
A concrete breaker includes a wheeled frame having front and rear wheels, a blade frame pivotally mounted to the wheeled frame between the front and rear wheels, and a heavy concrete breaking blade slideably mounted to the blade frame for busting concrete. The blade frame is pivotally moveable by a hydraulic cylinder assembly over-center to a stable transport position, and further is moveable over-center to an upright position on the wheeled frame for use. Wheels on the blade frame rest on the concrete being broken and support the operating weight of the blade frame and the blade when the blade is in use. The blade frame is moveable relative to the wheeled frame to reduce transmission of vibration from the blade and blade frame to the wheeled frame. The hydraulic cylinder assembly is connected between the blade frame and the wheeled frame and acts as a draw-bar-like member during use of the concrete breaker to overcome torsional forces on the blade frame as wheels on the blade frame engage rough terrain such as broken or irregular concrete under the blade frame. A hydraulic system is connected to the blade to raise the blade to a lifted position, and includes a double line discharge to exhaust hydraulic fluid from the cylinder without restriction when the blade is hydraulically released and dropped onto the cement to break the cement.
REFERENCES:
patent: 2254477 (1941-09-01), Ferguson
patent: 2587969 (1952-03-01), Cornett
patent: 2659583 (1953-11-01), Dorkins
patent: 2659584 (1953-11-01), Dorkins
Exhibit A are photographs disclosing a known prior art concrete breaker mounted on a truck bed. (undated).
Exhibit B is a product brochure entitled "E-Z Breaker", (publication date unknown), published by Chief Industries, Inc., Grand Island, Neb.
Exhibit C is a product brochure entitled "Fairmont Hydraulics Has Gotten Bigger . . . and Better", (publication date unknown) published by Greenlee Textron Inc., Fairmont, Minn.
Exhibit D is a product brochure entitled "New Drop Hammer", (publication date unknown) published by Rockford Industries, Inc., McAlester, Okla.
Price Robert E.
Trutsch James R.
Bagnell David J.
Price Industries, Inc.
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