GB622833A - Improved crankshaft grinding machine - Google Patents

Abstract

622,833. Grinding crankshafts. MIESSE, J. Aug. 21, 1946, Nos. 24952 and 24953. Convention dates, Sept. 29, 1945, and July 3, 1946. [Class 60] A machine for grinding crankshafts comprises a base having rotatably mounted thereon a horizontal drive plate for centering and fixing the crankshaft to be ground while the latter is in the vertical position, the said base supporting a standard provided with a slideway, a carriage balanced by a counterweight being adapted to slide along the said slideway, the said carriage carrying a grinding mechanism suspended for oscillatory movement. The flange on the lower end of the crankshaft 18 is bolted to a rotary chuck plate 16<SP>1</SP> which can be locked to a plate 16 guided in a diametrical groove 17 in a diametrical groove 17 in a horizontal rotary plate 3 driven through a belt 5 by a motor 7 adjustably mounted so as to tension the belt. The axial bore in the upper end of the crankshaft is engaged by a centre 21 carried by a vertically-adjustable headstock 20. A steady rest 27 is carried by a vertically adjustable member 25. Movable on a vertical slide 11 is a carriage 12 balanced by a counterweight 13; the carriage has a tube 28 on which slides a sleeve 29 rigid with a bracket 30 carrying a grinding wheel 34 and its driving motor 31. By rocking the sleeve about the tube the grinding wheel can be disengaged from the work, and caused to engage it progressively. The grinding wheel is urged against the work by a spring 63, Fig. 5, terminating in a pawl 66 engaging a rack 67 secured to the bracket 30; the pawl can be disengaged from the rack by operation of a lever 71 to permit retraction of the sleeve 29. A shaft 54 slidably mounted in the bracket 30 engages a stop 55 on the carriage 12; the shaft is adjusted by a nut 59 non-slidably journalled in the bracket 30 and rotatable by worm gear 60 operated by a knob 62. Vertical displacement of the carriage 12 on the slidway 11 is effected by a hand crank 49 operating a shaft 75 carrying a worm 76 engaging a pinion 50 integral with a pinion 52 co-operating with a rack 53 on the standard 10. The shaft 75 can be rocked about a pivot 79 to disengage the worm 76 from the pinion 50. Vertical displacement is then effected by means of a hand crank 77 on a shaft 51 carrying the pinions 50, 52. When it is desired to grind the crank pins, the plate 16 is adjusted in the slot 17 until the chuck plate 16' is eccentric to the plate 3 by an amount equal to the throw of the crank, the upper end of the crank shaft being supported by one end of an arm, adjustable in length to be equal to the throw, the other end of the arm engaging the centre 21.