B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
121/22
B25D 9/16 (2006.01) B25D 17/24 (2006.01)
Patent
CA 1154333
-13- ABSTRACT VIBRATIONSLESS IMPACT TOOL This invention relates to an impact tool com- prising a housing (10), a cylinder (12) axially movable in said housing (10), a hammer piston (17) provided with pressurized fluid-operated reciprocable drive means for driving said hammer piston (17), and a pressure regulating means (26,38) for controlling the supply and venting of air, to and from the cushioning space (27,30) and for balancing the pressure within the cushioning space (27, 30) relative to an actual forward feeding force applied to the housing (10). Known such tools have only a limited dampning. According to the present invention the said pressure regulating means (26,38) comprises a first part (26) located in a fixed disposition relative to said housing (10) and a second part (38) located in a fixed disposition relative to said cylinder (12), said first and second parts (26, 38) being formed and arranged so that changes in the relative positions therebetween corresponding to changes in the relative axial positions of said housing (10) and cylinder (12) controls the supply and venting of air, to and from the cushioning space (27-31), respectively.
376176
Atlas Copco Aktiebolag
Fetherstonhaugh & Co.
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