Patent GB-191223035-A (GB)
Title: Improvements in and relating to Machines for Setting Projectile Fuses.
IPC: B01D53/62
Filed: 1912-10-09
Granted: 1913-01-16
Abstract: 23,035. Krupp Akt.-Ges., F. Nov. 14, 1911, [Convention date]. Projectile fuses.-Relates to fuse - setting machines especially of the kind described in Specification 27,246/09, and consists in means for automatically causing slight variations in the settings of a number of fuses for a group of projectiles intended to burst at slightly different ranges, as is advantageous when firing against balloons. According to the invention, the ring K, Fig. 3, the position of which at the end of the revolution of the handle F determines the setting of the fuse by releasing the pawl a<3> a<1> of the ring A, is so controlled that it may have two or more terminal positions differing by small angles, which produce settings differing by small ranges. The spring slide M as heretofore is pushed in by the initial slight rearward motion of the lever F, remains thus for a short while, until the lever F in its forward course deviates a spring stop Q, and then springs forward again in readiness to stop the lever F at the completion of its revolution; also as heretofore, the slide M is coupled to the ring K by the arm k<5> so that it determines the position of that ring. For the purpose of the present invention, the ring M is stopped in its return forwards by a nut p<1> provided with a number of grooves, any one of which can be brought in line with a lug m<2> on the slide M; the grooves are of different lengths, and the length of the groove that is in action determines the extreme position of the slide M and therefore the final position of the ring K and the setting of the fuse. The nut p<1> can be rotated, to bring any groove in operation, by a shaft R which is free to slide within the nut, and can thus be placed in the inactive position shown, or can be slid inwards by a rack and pinion r<5>, t<2> to bring a ratchet-wheel r<3> or a ratchet-wheel r<1> on it in the path of a tooth f<2> on the lever F and thereby to be rotated one-sixth or oneninth of a turn respectively at each revolution of the handle F; this takes place during the forward motion of the handle F before the spring stop Q is deviated. The rack and pinion is worked by a handle t<1>, Fig. 8, and the three positions are indicated by marks c<6>, c', c<8> on the casing C. The shaft R, when in the inactive position is locked against rotation by a pin c<5> which fits in a longitudinal groove r<9> on the shaft, and, when in one of the two active positions, is allowed to rotate, but is locked against longitudinal displacement, as soon as the first step has been made and until the 6 or 9 steps respectively have been completed by circumferential grooves r<7>, r<8> in conjunction with the pin c<5>. When the shaft R is in the inactive position, the groove 1 is in line with the lug m<2>, but the slide M is stopped by a cheek t<3> on the spindle T of the pinion t<2>, and the setting of the fuse agrees repeatedly with the setting of the graduations of the machine. When the ratchet r<3> of the shaft R is in action, the cheek t<3> is out of action, the lug m<2> enters the short grooves 3, 5, the medium grooves 7, 9, and the long grooves 11, 1 in succession (see the development of the nut in Fig. 9), and six projectile fuses are set, the first two in accordance with the setting of the graduations of the machine, the next two for 100 metres more, the last two for still another 100 metres more; the machine then resumes the original position. When the ratchet r<4> of the shaft R is in action, the lug m<2> enters grooves 2, 4, 5, 6, 8, 9, 10, 12, 1 in succession, and nine projectile fuses are set in three groups of three, one group correctly, the second 100 metres in excess, and the third 200 metres in excess; the machine then resumes its original position.