| 摘要 |
FIELD: construction engineering, and can be used for drilling of bore-holes in ground. SUBSTANCE: means pressure is increased in working chambers on the path of the striker. To this end, the device is provided by a means of pressure control in the idle-stroke chamber. This means communicates the idle-stroke chamber of the striker with the atmosphere when it runs in the direction of percussion, or with the compress-air line on the largest part in the idle- stroke chamber before percussion that reduces the striker speed, and at the idle stroke its filling up increases. EFFECT: the impact energy grows without any increase of the device overall dimensions, which is the main characteristic determining the device capacity. 3 cl, 2 dwg |
