Dual-force hydraulic drive for a demolition tool

Details Dual-force hydraulic drive for a demolition tool Dual-force hydraulic drive for a demolition tool

1992-02-14

1993-04-06

Yost, Frank T.

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

2411017, 30134, 91519, B02C 106

Patent

active

051996588

ABSTRACT:
A demolition tool includes a carrier body and two tool blades mounted thereon to define a tool mouth for receiving material to be crushed. The demolition tool further has a hydraulic cylinder including a cylinder housing as well as first and second chambers defined therein. A piston rod is received in the cylinder housing and projects therefrom for moving at least one of the blades. First and second pistons are spacedly affixed to the piston rod and bound the first and second chambers, respectively. Hydraulic fluid is introducible into the first and second chambers for exposing the pistons to pressure to generate a force for moving the piston rod in a working direction. A control unit is operatively connected to the chambers for controlling admission of hydraulic fluid thereto. The control unit has a first position in which the control unit admits hydraulic fluid solely to the second chamber and a second position in which the control unit admits hydraulic fluid under pressure to the first chamber.

REFERENCES:
patent: 3260167 (1966-07-01), Pedersen et al.
patent: 3984151 (1976-10-01), Altmayer
patent: 4196862 (1980-04-01), Tagawa
patent: 4512524 (1985-04-01), Shigemizu
patent: 4934616 (1990-06-01), Zepf
patent: 4961543 (1990-10-01), Sakato et al.
patent: 5060378 (1991-10-01), La Bounty et al.

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