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. 13, 1978
Filed:
Sep. 30, 1976
Abraham Gien, Swartruggens, Transvaal, ZA;
Bernard Lionel Gien, Swartruggens, Transvaal, ZA;
Other;
Abstract
A pneumatic percussion machine such as a drill having a piston reciprocating in a casing, chambers formed in the casing at or towards the ends of the piston, the arrangement permitting compressed air to be supplied alternatively to the chambers, the compressed air to the one chamber being supplied through a projecting member located co-axially in the casing, and over which the piston reciprocates, and the piston and compressed air from the other chamber being exhausted from such chamber between the wall of the casing and a stepped portion of the piston and then through the piston to atmosphere. Provision is made for the piston to move to a position, in an inoperative condition of the machine, in which both chambers are open to the atmosphere.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile