Patent GB-572733-A (GB)
Title: Improvements in or relating to integrating mechanisms
IPC: G01C21/16
Filed: 1940-01-29
Abstract: 572,733. Integrating apparatus. FERRANTI, Ltd., GRUNDY, E., CLUDERAY, E. S., and SMITH, P. B. N. NUTTALL-. Jan. 29, 1940, No. 12852/41. Divided out of 572,598. [Class 106 (i)] For integrating components of vector quantities of the same magnitude, on each occurrence of the quantity, one member of a oneway drive is rotated until arrested by a stop positioned by a direction-measuring device, the distance moved by the member for any quantity being an amount D + D cos #, where D is half the distance moved when # is zero, # being the angle made by the vector quantity with a datum line, means for returning the member to initial position after each occurrence, and summation means for adding uni-directional movements of the member and subtracting " D " for each quantity. An air-log 1, 2 drives through worm gear 4 5 a cam 3 which operates a switch lever 6 to close the contacts of an electromagnet 7 every 1/10th mile traversed. Attached to the spindle of the rotary armature 8 is an arm 97, a pin 98 on which projects through an arcuate slot in a toothed wheel 99 loose on the shaft 96. This drives a gear 100 on a spindle 101 carrying a triangular plate 102 between which and the inner surface of a cup 103 are balls 104. The cup 103 which is toothed on the outside is mounted in a plate 109 having wedge-shaped sockets 110 provided with balls 111. An arm 105 loose on spindle 101 has one end 106 bent to lie in a ball space, and the other end 107 bent oppositely, and is urged counterclockwise by a spring 108. A stop 112 on plate 109 co-operates with a pin 113 on the plate 102. Movement of the cup is transmitted by gears 114, 118 and 119 to a sun-wheel 115 of a differential gear 115, 116, 117, of which the planet wheel 117 is carried by the spindle 124. The sun wheel 116 is driven by a ratchet wheel 120 and pawl 121, a stop 122 preventing overshooting. The pawl 121 is carried by a lever 123 loose on spindle 124 and normally acted upon by a spring 125 tending to move it against a stop 122'. The spindle 124 drives pointers 38. A compass 42 operates through remote control, a motor 41 which rotates a disc 128 and an offset pin 129 which slides in a slot 130 in an arm at right angles to a rack 131 gearing with a pinion 132 in one with an arm 133 and stop 134. In operation, at every 1/10th mile the armature 8 is rocked counterclockwise and also arm 97. The arm 123 is then moved by its spring so that the pawl 121 slips over one tooth. The spindle 101 is moved clockwise and plate 102 grips the balls 104 and rotates cup 103 in the same direction, this rotation being conveyed to wheel 115. The end 106 of lever 105 is carried round until stop 107 engages stop 134. When this occurs, end 106 presses on the adjacent ball and prevents cup 103 overshooting. The position of the stop 134 is determined by the compass, the rack moving according to the cosine of the angle made by compass needle with the north-south direction. When the magnet is de-energized, the spring 127 moves arm 97 clockwise and pawl 121 drives wheels 120 and also 116. This motion of the armature also releases balls 104. The stop 134 is arranged so that the cup 103 makes a rotation of an amount D+D cos # and the gear ratios are arranged so that the wheel 116 subtracts an amount D, the planet wheel 117 conveying motion to the pointers proportional to D cos #.