To effectively remove dusts which intrude into a hammering chamber of a hydraulic breaker and adhere to the outer peripheral surface of a piston with a simple configuration in a dust-proof device of the hydraulic breaker.
The dust-proof device of the hydraulic breaker includes a hydraulic breaker body 1 having a cylindrical hollow part, a piston 2 slidably fitted to and inserted in the hollow part, a hollow chamber 4 formed in the hollow part of the hydraulic breaker body 1 so as to cover the surface of the piston 2, an inflow passage 5a for infusing a working medium into the hollow chamber 4, a discharge passage 5b for discharging the working medium from the hollow chamber 4, and ring-like oil seals 6a, 6b disposed at the front and rear in the axial direction of the piston of the hollow chamber 4.
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MATOBA NOBUAKI
Naozumi Ono
Sachiko Okunuki