Tamrock Oy

Bretec Oy

Jouni Salo

Kauko Juuri

Esko Juvonen

An impact breaker has a sleeve which slidably receives an end portion of a tool. The tool is formed over its end portion with a groove extending completely around the end portion of the tool for receiving lubricant for lubricating movement of the tool in the sleeve.

Tool of a breaking apparatus

The invention relates to a hydraulic percussion hammer comprising a piston (1), a pressure accumulator (7) in the high pressure circuit, a main valve (8) alternately conducing a high and low pressure to at least one of the pressure surfaces (2,4) of the piston (1) for making the piston (1) move reciprocally, and a tool (3) which the piston (1) strikes, and, for the purpose of controlling the main valve (8), a control pressure valve (9) which opens when the pressure exceeds a set value. According to the invention, the control pressure valve (9) is placed in such a way that the spindle (27) of the control pressure valve (9) is connected from one end to the high pressure circuit of the hydraulic percussion hammer. Furthermore, for the purpose of adjusting the maximum and minimum operating pressure of the hydraulic percussion hammer the other end of the spindle (27) of the control pressure valve (9) comprises a control space (29) connected through the hydraulic ducts to at least two pressure control devices (30,31,32,33) connected hydraulically in parallel or in series.

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Lahti, Finland

Jouni Salo