Importance

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Abstract

The invention relates to a driving tool for fastener elements, wherein a tool casing includes a valve cavity of a main valve closed by a casing cover, a valve piston being sealingly and slidingly mounted coaxially within the valve cavity about a work cylinder, the valve piston when in a lower position sealingly engaging upon an upper edge of the work cylinder so as to close an inlet passage communicating with a pressure air source and opening into an upper work space of the work cylinder, and the valve piston when in an upper position closing an outlet passage, which communicates with the work space via a throughbore of the valve piston, by sealingly engaging a valve seat element, the valve piston having a lower work surface which is continuously subjected to pressure of the pressure air source, and an upper work surface adapted to be selectively subjected to atmospheric pressure or pressure of the pressure air source by a control valve, the improvement of which is characterized by the valve piston having axially extending throughbores, interconnecting webs extending through the throughbores, and the interconnecting webs having one end connected to a sealing ring at the bottom of the valve piston and having an other end connected to a damper ring at the top of the valve piston.

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First Claim