GB673031A - Drop hammer controls - Google Patents

Abstract

673,031. Power-hammers. CHAMBERSBURG ENGINEERING CO. Jan. 13, 1950 [July 25, 1949], No. 887/50. Class 83 (iv). [Also in Group XXVI] An elastic fluid-operated drop-hammer comprises a vertically-movable ram 7 actuated by a piston 5 and controlled by a main valve 12 operable in one position to admit pressure-fluid for moving the piston downwardly, the valve being actuated by pilot means 30 controlled by a device 33 which is actuated by means including one or more variable timing devices 45 individually operable to actuate the control means for one or more predetermined time intervals and thereby to move the valve to the said position to cause the ram to strike a blow or a succession of blows, each of predetermined intensity. The valve controls the supply of fluid from an inlet passage 19 to either of passages 20, 21 leading respectively to each end of a cylinder 4 and is raised against a spring 24 by the pilot piston 30 which is operated by pressure fluid supplied through passages 37, 39 and controlled by a valve 35. The latter is opened against a spring 41 by a solenoid 43 whose period of energization is determined by an electronic timing device 45 fitted with a time selector dial 46. A series of pre-set timing- devices may be coupled in parallel with the solenoid and operated in sequence by camoperated limit switches to produce a predetermined sequence of blows of different or equal intensity. Specification 668,601, [Group XXXV], is referred to.