US 5,607,022 AGranted

Concrete drop hammer attachment device

OwnerLeon R. Walker, Thomas P. Clarkinventors

Life of this patent

Estimating the term…

Loading patent…

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.

Claims8

Dependent claims

A device for attachment to a skid steer to be used for breaking up a surface comprising:

attachment means provided on the device for removably attaching the device to a skid steer,
a weight being movably provided on said device, hydraulic means being attached to said weight, said weight being moved upward to a lifted position when hydraulic fluid is supplied to said hydraulic means and said weight falling downward to a lowered position when hydraulic fluid is removed from said hydraulic means,
a dump valve being hydraulically connected to said hydraulic means such that hydraulic fluid is supplied to said hydraulic means when said dump valve is open and hydraulic fluid is removed from said hydraulic means when said dump valve is closed,
a directional valve being connected to said dump valve such that hydraulic fluid flows to said dump valve only when said directional valve is open,
a switch provided on said device such that said switch is tripped when said weight reaches its lifted position,
a timer being connected to and activated by said switch when said switch is tripped, said timer being connected to said dump valve and to said directional valve so that when the timer is activated the timer causes both the dump valve and the directional valve to momentarily close before the timer resets itself and allows the valves to reopen;
and
said hydraulic means further comprising a hollow rod being suspended on said device by a first end of said rod, a hollow cylinder movably capturing a second end of said hollow rod, said cylinder being provided with an upper cylinder chamber above said second end, a nipple being provided on said first end in order to provide fluid communication between said dump valve and a rod chamber provided within said hollow rod, and said second end of said hollow rod being provided with at least one perforation in order to provide fluid communication between said rod chamber and said upper cylinder chamber.

5 more elements

A device for attachment to a skid steer to be used for breaking up a surface on the ground comprising:

attachment means for removably attaching the device to a skid steer;
a weight movably provided on the device such that the weight moves between an upward lifted position and a downward lowered position, hydraulic means for lifting said weight, said hydraulic means for lifting said weight being hydraulically connected to and controlled by a dump valve so that said weight is lifted when the dump valve is open and said weight falls when the dump valve is closed, said dump valve being hydraulically connected to a directional valve, said directional valve being connected to a hydraulic tank provided on the skid steer,
a timer being electrically connected to both said dump valve and said directional valve in order to simultaneously close both valves for a predetermined period of time before the timer resets itself and allows the valves to reopen,
said timer being electrically connected to a switch provided on the device, said weight tripping said switch when the weight is raised to its lifted position,
a breaking tool being provided on the weight so that the breaking tool impacts the ground when the weight falls to its lowered position, a frame, said attachment means being permanently attached to said frame, said weight movably retained within said frame, said switch being attached to said frame, and
said hydraulic means for lifting said weight further comprising a hollow rod having two sealed ends, a rod chamber being provided between said ends;
said rod being suspended by a first end to at least one upper frame member provided on said frame,
a second end of said hollow rod being movably captured within a cylinder so that the first end of the hollow rod is external to the cylinder and the second end of the hollow rod is within the cylinder, an upper cylinder chamber being provided within the cylinder above said second end and a lower cylinder chamber being provided within the cylinder below said second end,
nipple means provided in said first end of said hollow rod, said nipple means providing fluid communication through said rod to said rod chamber, and at least one perforation being provided in said second end of said hollow rod in order to provide fluid communication between said rod chamber and said upper chamber.

6 more elements

Dependencies are inferred from the claim text.