Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB15734/39A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knorr Bremse AG
Original Assignee
Knorr Bremse AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Knorr Bremse AGfiledCriticalKnorr Bremse AG
Publication of GB529293ApublicationCriticalpatent/GB529293A/en
B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
B25D9/06—Means for driving the impulse member
B25D9/10—Means for driving the impulse member comprising a built-in internal-combustion engine
Abstract
529,293. Percussive tools. KNORRBREMSE AKT.-GES. May 26, 1939, No. 15734. Convention date, June 4, 1938. [Class 124] In a percussive tool of the kind having a fully floating piston b the working stroke of which is effected by internal combustion and the idle stroke by compressed air, the compressed air is controlled by a piston slide valve d of approximately bobbin shape, carrying at its upper end a collar and operated in one direction by a spring m. In the position shown the lower end cf the cylinder is open to compressed air supplied to a port f, through the reduced portion of the valve conduit g. The piston b is thereuponraised. When the exhaust ports e are closed, air above the piston is compressed and eventually the valve d is raised so as to connect the lower end of the cylinder to exhaust at e.
GB15734/39A1938-06-041939-05-26A percussive tool operable by an internal combustion engine
ExpiredGB529293A
(en)