Method and apparatus for lubrication of piston-operated drill

Details Method and apparatus for lubrication of piston-operated drill Method and apparatus for lubrication of piston-operated drill

F - Mech Eng,Light,Heat,Weapons

16

L

184/36, 255/46

F16L 25/02 (2006.01) B25D 17/26 (2006.01) E21B 1/38 (2006.01)

Patent

CA 1037947

Abstract of the Disclosure A drill comprising a body means having an axial, generally cylindrical, interior space is provided with a first cylindrical piston means axially slidable between a first and a second position within the cylindrical space. The piston is provided with an extension in the form of a second piston means, and the first and second piston means surround an axially disposed flushing tube means, which with the piston means defines a first annular oiling space. The flushing tube means, the first piston means and the body define a second annular oiling space, while the flushing tube means, the second piston and the body define an annular pumping zone. A source of lubricating fluid communicates with the pumping zone by means of the body inlet means as the first piston means is moving towards said first slidable position, and the pumping zone communicates with the second annular oiling space by means of the first annular oiling space as the first piston means is moving towards said second slidable position. The first annular oiling space and the inlet means are provided with one-way valve means. In this manner, the surfaces between the flushing tube means and the piston, as well as the surfaces, for example, between a drill neck and a bushing in the second annular oily space, are effectively lubricated and cooled.

225557

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