Stone working – Tools – Impact
Patent
1990-12-18
1992-08-04
Kisliuk, Bruce M.
Stone working
Tools
Impact
125 2301, 173134, 173135, B25D 918
Patent
active
051349892
ABSTRACT:
A hydraulic breaker includes a piston which is designed in the five-staged configuration including a first stage, a second stage, a third stage, a fourth stage and a fifth stage. The second stage is dimensioned to have a largest diameter, the fourth stage is dimensioned to have a larger diameter and the first stage, the third stage and the fifth stage are dimensioned to a same smallest diameter, respectively. A piston reversing chamber, a low pressure hydraulic chamber in which low pressure is normally present for the piston, a low speed pilot chamber for driving the piston at a low speed, a high speed pilot chamber for driving the piston at a high speed and a high pressure hydraulic chamber in which high pressure is normally present for the piston are sequentially formed in the space between the piston and the inner wall surface of a cylinder. A high pressure oil inlet port is communicated with high pressure hydraulic passages via a plunger type main valve for changing the direction of transmission of the hydraulic pressure so as to suppress variation of surge pressure in the high pressure hydraulic passages. In addition, a low pressure oil discharge outlet port is communicated with a low pressure hydraulic passage so as to suppress variation of surge pressure in the low pressure hydraulic passage.
REFERENCES:
patent: 4646854 (1987-03-01), Arndt et al.
patent: 4784228 (1988-11-01), Ito
patent: 4817737 (1989-04-01), Hamada et al.
patent: 4852664 (1989-08-01), Terada et al.
patent: 4951757 (1990-08-01), Hamada et al.
Izumi Products Company
Kisliuk Bruce M.
Marlott John A.
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