Patent GB-147130-A (GB)
Title: Traversing gear for ordnance
IPC: F41G3/14
Filed: 1920-07-07
Abstract: 147,130. Krupp Akt.-Ges., F. April 12, 1917, [Convention date]. Naval and garrison carriages and mountings.- Relates to means for imparting the correct traverse to each of several guns controlled electrically from a common observation post, and consists in employing between the main transmitter at the observation post and the guns an apparatus containing for each gun an auxiliary transmitter, which is adjusted by the main transmitter and also by gearing which corrects for the lateral displacement of the gun from the line of sight at the observation post, this gearing being so constructed that the correction depends on the distances of the gun and target from the observation post, and on the sine of the angle subtended by gun and target at the observation post. Fig. 2 shows schematically ship's guns B', B<2>, B<3> engaging a target B<4>, and controlled from a common observation post B. The traverse angle # of any gun is given by #=alpha+gamma, where a is the same for all the guns, and gamma=d sin alpha/r approximately, d being the distance of the gun from B, and r the gun range BB<4>. Figs. 4 and 6 show one form of apparatus for imparting to each gun the correct traverse according to these formulae. The sighting telescope D at the observation post B is traversed upon the target, and its traverse angle a is transmitted by electrical means d<5>, E, F to a shaft f<1>, whence it is transmitted mechanically to (1) the bevel-wheel f<5> of a differential gear, (2) a drum G turning in a fixed casing g<2>, and electrically by means f<8>, N to (3) pointers p<2> of indicators P mounted near each gun. The other bevel-wheel g<9> of the differential gear is rotatable by a hand-wheel g<4> by an amount depending inversely upon the range r defined above, a helical scale being provided on a drum g<3> for this purpose. The pinion g<12> of the gear, whose shaft g<10> is fast with a bevel-wheel g<13>, turns a bevelwheel g<14> on a shaft g<16> mounted on a diameter of the drum G and screwed to receive a nut h' on an arm H maintained parellel to the axis of the drum G, the end h<2>, Fig. 5, being guided in a slide h<4> which is capable of displacement in a fixed guide h<3> at right-angles to the slide, and carries a rack h<5> engaging a pinion on a shaft J. The displacement of the nut h' along its screw is inversely proportional to r, and, since the screw g<16> is rotated with the drum G through an angle a, the rack h<5> is displaced, and the shaft J is rotated, by an amount proportional to sin alpha/r. By choosing the gear ratios of gears i<11>, i<12> to correspond with the individual values of d defined above, transmitters i<9> are caused to rotate through angles proportional in each case to d sin alpha/r, i.e. to y, and the values of gamma are communicated to the pointers p<3> of indicators P' adjacent to the indicators P which give a. The addition a + y to give the traverse # to each gun is effected as follows. The indicated value of gamma is transmitted to the bevel-wheel q<5> of a differential gear by turning a hand-wheel until a follower q<2> coincides with the pointer p<3>. The other wheel q<4> of the differential gear is connected to the gun traversing-gear, and the handwheel q<11> of this is operated until a following mark q', geared to the pinion q<3> of the gear, is restored to coincidence with the pointer p<2>. In a modification, the addition a + gamma is effected automatically by differential gears between the shafts f<1> and J, and the resulting values of # are transmitted to the various guns by apparatus designed to indicate the correct traverse at the gun. The traverse may be automatically imparted to the gun in the device shown in Figs. 4 and 6, either by connecting the gun carriage to the rotor of a polyphase motor, the stator and rotor winding of which are connected respectively to the transmitters, f<8> and i<9>, of the angles a and gamma, or by connecting the carriage to the planet pinion of a differential gear the bevel-wheels of which are driven from two synchronous motors controlled by the transmitters f<8> and i<9>. A device is described which permits the control of the traverse from any one of several observation posts.