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
Inventor
Henry Brookes Edwards
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.)
Individual
Original Assignee
Individual
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 IndividualfiledCriticalIndividual
Application grantedgrantedCritical
Publication of GB190300771ApublicationCriticalpatent/GB190300771A/en
771. Edwards, H. B. Jan. 12. Undercutting etc.; rock drills, percussive. The tool spindle a slides in bushings at b in the saddle, and is drawn back against the spring o by the cam l acting on the roller n carried by an arm on the spindle. The rear end of the spindle is provided with a suitable buffer r, and is squared to prevent rotation in the squared bushing. As shown, the cam l is driven through spur gearing f from an electromotor through a flexible shaft k. As an alternative, the cam l may be fixed and the spindle revolved by applying the gear to the rear bushing b. The spring o is preferably enclosed by a casing q, which is shown as partly broken away.