PORTABLE RAIL DRILLING MACHINE Russian patent published in 1997 - IPC

FIELD: tramway track maintenance equipment. SUBSTANCE: this relates to power tools. Motor 3 and gearbox 4 of drive unit of portable rail drilling machine are arranged at different sides of spindle 5 and across it so that their axes are crossing at right angle. Output shaft 9 of gearbox 4 and spindle 5 are connected through orthogonal bevel gearing 10. At distance of point of crossing axes of motor 3 and gearbox to working end of spindle being equal to 0.55-0.85 of motor lateral dimension, housing 2 is provided with removable counterweights 11. Feed mechanism is provided with cam-type end-face device. Machine is complete with templates with configuration of ones of their sides corresponding to configuration of different types of tramway rails. All templates have removable centering stops 19. Pusher 12 of feed mechanism cam-type device is provided with ball which interacts with cam working surface. Pusher is made in the form of shaped protrusion on generating line of spindle 5 with configuration of end face being mirror-like of configuration of end-face cam. EFFECT: high efficiency. 2 cl, 19 dwg