ES315534A1 - A pneumatic percussion device. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A pneumatic percussion device comprising a cylinder; a piston hammer mounted for reciprocating movement in the cylinder; selectively driven means for supplying compressed air to the cylinder; means for automatically controlling the supply of compressed air to the cylinder according to the action of said selectively actuated means, said last-mentioned means comprising a reversing valve; said cylinder having air passages communicating with it at a point spaced from the most anterior end of the cylinder and communicating with said reversing valve; said cylinder having intermediate aeration passages in its length communicating with the atmosphere; communicating said aeration passages and said air passages with the cylinder at axially spaced positions of the cylinder a distance slightly less than the axial length of said piston; said reversing valve comprising a tubular cage mounted in axial alignment with the cylinder at its rear end and having a concentric valve guide located therein; a sleeve-shaped valve member mounted within said tubular cage and around said valve guide for axial movement; said valve cage having at its rear end entry ports leading to the interior of a first rear annular chamber formed therein, said entrance ports being connected to said air supply means selectively operated, said first chamber being provided with air passages communicating with said air passages of the cylinder, said valve cage being provided with a second annular chamber located between its ends that is in communication with the atmosphere, said valve cage being provided with a third annular front chamber that communicates by axial passages with the rear end of said cylinder, said valve member being provided with axially leading passages therethrough; having said valve member when in its previous position with the piston in its previous position, said third chamber connected to the rear end of the cylinder, with said first chamber connected to said entrance ports, so as to allow the passage of air to the inside said first chamber by actuating said driven means selectively, and then into said air passages of the cylinder to reach the space of said cylinder in front of the piston through said air passages of the cylinder, communicating the space of said cylinder behind the piston with the atmosphere through said cylinder aeration passages; making the air pressure supplied in front of the piston by said selectively actuated means, the piston moving backward in the cylinder to thereby close the aeration passages of the cylinder and to move the valve member back to connect in this way the source of supply of compressed air through said ports of entry of the valve and said ports of the valve member through said third chamber to said rear end of the cylinder, to interrupt the passage from said ports of entry to said first chamber and the air passages of the connected cylinder, and to connect the first chamber with the second chamber in communication with the atmosphere to thereby connect said air passages of the cylinder and the cylinder space to the atmosphere in front of the atmosphere. piston during the actuation of said means operated selectively, communicating with the atmosphere continuously said space in front of the piston during the forward stroke of the piston until said air passages of the cylinder are closed when the piston approaches the end of its forward movement. (Machine-translation by Google Translate, not legally binding)