GB808480A - Improvements in or relating to fuze-setting apparatus - Google Patents

Abstract

808,480. Fuze-setting apparatus. HARVEY. V. P., MASON, J. A., and MOLINS MACHINE CO. Ltd. Feb. 28, 1946 [Jan. 31, 1945], No. 2494/45. Class 9 (1) Predictor controlled fuze-setting apparatus incorporating a magslip transmitter at the predictor and a magslip resetter and hunter at the gun, comprises variable ratio gearing between an adjustable control member and the magslip resetter so that the fuze setting given to the shell may differ from that determined by the predictor, in order to allow for wear of the gun barrel &c. The adjustable control member comprises a stop on a worm wheel 35 which determines the length of time of engagement of a clutch in the gear train, driven by the movement of the loading tray and which turns the fuze setting head to set the fuze. When the clutch disengages the worm wheel, by means of the adjustable control member may drive this gear train and the fuze setting head and minor alterations of the setting value are made. The worm wheel 35 is driven by an oil motor 54 controlled by the magslip hunter. The adjusting movement of the adjustable control member only ceases when the magslip setter and magslip transmitter have been brought into step and as the re-setter is driven by the worm wheel 35 the time of this occuring is varied by the variable ratio gearing. This gearing comprises a cam 150 fixed to the worm wheel 35 which drives a rack 154 connected by gearing 160, 153, 152 to the re-setter 151. The cam 150 has a sloping cross-section and the rack is adjustable laterally across this slope to give the variable gear ration, by a manually operated screw which moves the mounting 155 of the rack. Alternatively the cam may be moved according to the Provisional Specification. A ball and disc drive may replace the cam and associated parts or a set of close ratio gears may be employed Specification 808,479 is referred to.