Single-blow pneumatic percussive tool

Details Single-blow pneumatic percussive tool Single-blow pneumatic percussive tool

B - Operations, Transporting

25

D

121/16

B25D 9/00 (2006.01)

Patent

CA 1290996

SINGLE-BLOW PNEUMATIC PERCUSSIVE TOOL Abstract A single-blow pneumatic percussive tool comprises a hollow cylindrical casing accommodating a reciprocatable hammer piston which divides the interior space of the cas- ing into an upper chamber and a lower chamber. A spring- biased valve is mounted on the side of the lower chamber and a working member is secured to the valve. An air dis- tribution device is mounted on the side of the upper cham- ber and has passages and a control lever. The hammer pis- ton has an axial passage in which a tube is mounted which has a shoulder on the outer surface and a continuous inner partition wall. The tube has upper and lower ports dispos- ed on either side of the partition wall. An air distribu- tion sleeve biased by spring on the side of the air dis- tribution device is mounted on the tube and has an inner recess. The air distribution sleeve is movable under the action of the hammer piston to the upper position in which it covers the lower ports and the air distribution sleeve is movable under the action of a spring means to the lower position defined by the shoulder, in which it establishes communication between the upper and lower ports through the inner recess.

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