The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1987
Filed:
May. 16, 1985
Applicant:
Inventor:
Stig R Henriksson, Nacka, SE;
Assignee:
Atlas Copco Aktiebolag, Nacka, SE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25D / ;
U.S. Cl.
CPC ...
173116 ; 173134 ; 138 30 ;
Abstract
A hydraulic percussive machine, for example a jack hammer or a rock drill, has an accumulator with a flexible diaphram (35). A lift valve (40, 41, 42) closes the outlet of the accumulator if the flow exceeds the normal flow substantially and it traps a volume of oil between the diaphragm and the valve when it closes.