Pneumatic hammer

Details Pneumatic hammer Pneumatic hammer

E - Fixed Constructions

21

B

E21B 4/14 (2006.01)

Patent

CA 2097067

2097067 9308363 PCTABS00021 A pneumatic hammer is provided with an adjusting means (37) dependent on the supply pressure, which adjusts the stroke length of the working piston (16). Thereby, the same pneumatic hammer may be operated both at low and high supply pressures. With high supply pressures, either the early ending of the acceleration phase or the early start of the compression phase or the shortening of the working cylinder shortens the stroke length. Thereby, the pneumatic hammer performs impacts with a substantially constant single-impact energy, regardless of the supply pressure. High supply pressures increase the impact frequency. This results in a considerably improved efficiency at a high drilling capacity, a reduced wear and a reduced risk of ruptures of the components of the hammer.

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