DRILL Russian patent published in 2013 - IPC B25D16/00 B25D11/06 B25D17/06 

FIELD: process engineering.

SUBSTANCE: invention relates to hand-held machine, particularly, to drills. Drill comprises housing, piston cylinder, helical spring, countershaft and impact transfer element located at countershaft rear end. Helical spring is arranged inside said housing, behind piston cylinder, to force the latter forward with working drill. Impact transfer element comprises section to revolve independently of counter shaft and joint lever. Said element converts countershaft rotation into reciprocation to be transferred to piston cylinder. Support plate is arranged at piston cylinder rear end. Said support plate includes to side plates with front edges, rear edges and holes, and base section to connected side plate front ends. Support plate base section stays in contact with piston cylinder rear surface. Side plate rear ends stay in contact with helical spring front end. Side plate holes are configured to retain pin with joint lever hinged thereto.

EFFECT: longer life of piston cylinder.

12 cl, 5 dwg