US 4,363,365 AGranted

Impact tool with damping chambers

OwnerIgor V. Nikolaev, Vladimir A. Evpolov +9inventors

InventorsIgor V. Nikolaev, Vladimir A. Evpolov, Lidia M. Dronova, Anatoly I. Lednikov, Mikhail A. Moskvin, Oleg Y. Sutyagin, Oleg A. Yankovsky, Viktor E. Kilin, Evgeny S. Kolmyk, Konstantin K. Tupitsyn, Alexei M. Makarov

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Abstract

A pneumatic percussive tool has a barrel in which is inserted a hammer piston imparting blows at a working tool at regular intervals. A floating sleeve surrounding the working tool is provided in the front end portion of the barrel, the sleeve having a projection defining with a barrel groove a damping chamber communicating with a source of compressed gas. There is provided a shell rigidly secured to the barrel, which surrounds the sleeve so as to define in the zone of its projection an auxiliary damping chamber communicating with the source of compressed gas when the sleeve is in its lower position.

Claims6

Dependent claims

A pneumatic percussive tool, comprising:

a barrel;
a hammer piston reciprocatingly mounted in said barrel;
a sleeve in said barrel;
said sleeve having an external annular projection defining with said barrel an auxiliary damping chamber and a second damping chamber;
said sleeve being axially movable between two extreme positions;
a working tool having a collar engaging the end of said sleeve on the side of said auxiliary damping chamber;
a supply passage in said barrel permanently connecting said second damping chamber with a compressed fluid source;
a first part in said barrel for connecting said supply passage with said auxiliary damping chamber;
a second port in said barrel communicating with said second damping chamber;
said compressed fluid acting with greater force on said sleeve on the side of said auxiliary damping chamber than on the side of said second damping chamber;
both said ports communicating with said auxiliary damping chamber when said sleeve 18 is in the first of said extreme positions;
said first port being closed when said sleeve is in the second of said extreme positions.

9 more elements

Dependencies are inferred from the claim text.