Importance

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Abstract

The invention relates to a driving tool for fastener elements, comprising a casing (1), a working cylinder (3) located in the said casing, and a main valve coaxially mounted atop the said working cylinder, the said main valve comprising a valve chamber (22) located in the said casing (1) and closed by a cap (24), the said main valve further comprising a valve piston (25) which is sealingly and slidably guided in the said valve chamber (22), wherein the valve piston has a lower position in which an inlet passage connected to a source of compressed air is closed with respect to the upper working chamber of the said working cylinder and which valve piston has an upper position in which an outlet passage (43,47,48) which is connected to the working chamber via a throughbore (29,30) of the valve piston is closed by sealingly engaging a valve seat element (34), wherein the valve piston further includes a lower surface area which is continuously subjected to the pressure of the source of compressed air and a further upper surface area which is selectively subjected to atmosphere or the pressure of the source of compressed air by a control valve (15,16,17), wherein the outlet passage (20,30,43,47,48) includes at least an opening (49) at the periphery (46) of the cap (24) that the cap supports a rotatably arranged aperture ring (51) having at least an outlet opening (54) cooperating with the said passage opening, that a peripheral connecting passage (47) extends between the cap and the aperture ring connecting a passage opening and the outlet opening and that the aperture ring (51) is sealingly clamped between the cap (24) and the said casing (1).

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First Claim