Concrete drop hammer attachment device

Details Concrete drop hammer attachment device Concrete drop hammer attachment device

1995-03-10

1997-03-04

Smith, Scott A.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173114, 173211, 173 89, B25D 900

Patent

active

056070225

ABSTRACT:
A device removably attaches to a skid steer and is used for breaking up asphalt, concrete, etc. A hollow rod is suspended from the device, and a nipple provides liquid communication to the interior rod chamber of the hollow rod. A head is provided on a lower end of the rod and a cylinder is movably provided around the rod's lower end so that upper and lower cylinder chambers are formed within the cylinder, above and below the head. Perforations provided in the lower end of the rod provide liquid communication between the rod chamber and the upper cylinder chamber. The lower cylinder chamber is charged with gas. A weight and a breaking tool attach to the bottom end of the cylinder and move upward and downward in conjunction therewith. A switch provided on the frame is tripped as the weight is raised, thus sending an electrical impulse to a timer, causing it to momentarily supply electricity to dump and directional valves, simultaneously closing them. The timer then resets and removes electricity from the valves, allowing them to simultaneously reopen. When the dump and directional valves are open, hydraulic fluid is pumped into the upper cylinder chamber and the weight is lifted. When both valves close, the dump valve quickly drains the upper cylinder chamber, thus causing the weight and the breaking tool to fall to the ground.

REFERENCES:
patent: 2659583 (1953-11-01), Dorkins
patent: 3658139 (1972-04-01), Von Ruden
patent: 4439056 (1984-03-01), Reilly et al.
patent: 4634311 (1987-01-01), Jinnings et al.
patent: 4852661 (1989-08-01), Ellington
patent: 5012873 (1991-05-01), Kennedy et al.
patent: 5291955 (1994-03-01), Clark
patent: 5490740 (1996-02-01), Johnson

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