GB458214A - Method and apparatus for cartographically tracing the geographical path of a vehicle moving in a fluid medium - Google Patents

Abstract

458,214. Intermittent toothed gearing. SUFFIT, R. M. R. C., 47, Rue Lafontaine, and TAILLEFERRE, H. E., 350, Rue Saint HonorÚ, both in Paris. Dec. 20, 1935, No. 35379. [Class 80 (i)] [See also Group XX] In a course-recording apparatus mechanism F, Fig. 5, is provided for connecting a shaft 26b to a continuously driven shaft 30 for a fraction of each of the latter's revolutions dependent on the setting of a shaft 37. A speed cam 31 and course cam 33 determine the setting of the shaft 37 in accordance with a component v sin ° of the craft's speed. A pinion 80, Fig. 6a, on the shaft 30 constantly meshes with a pinion 81 mounted in a support 83. The latter turns freely about the shaft 30 but is urged by a spring 86 to a position in which pinions 84, 85 fixed to pinion 81 mesh with pinions 77, 78. The pinion 77 and a disc 69 notched at 70 are fixed on the shaft 37 and the pinion 78 is freely mounted on the shaft 37 and in mesh with a pinion 79 on the shaft 26b. In the position shown in Fig. 6a, the pinions 84, 85 and 77, 78 are held out of mesh by the engagement with an arm 88 on the support 83 of a finger 76 on the branch 75 of a spring-urged pawl 71 resting in the notch 70. As the shaft 30 and a cam 89 having an outline comprising two semicircular parts of different diameters turn a shoulder of the cam rocks a lever 90 which is pivoted at the pivot 72 of the pawl 71 and when rocked engages a finger 93 on the branch 75 causing the pawl 71 to be withdrawn from the notch 70, the support 83 being held in the disengaged position, however, by the simultaneous engagement of the lever 90 with a finger 94 thereon. When the pawl is withdrawn from the notch 70 the disc 69, pinion 77, and shaft 37 are turned by the springs 96, Fig. 5, through an angle proportional to the component v sin ° of the craft's speed. When the cam 89 has turned sufficiently to permit the lever 90 to engage the lower cam surface again, the support 83 is released and the pinions 84, 85 engage and drive the pinions 77, 78 until the notch 70 is returned to the zero position and allows the pawl 71 to move and cause the pinions 84, 85 and 77, 78 to disengage. During the return movement of the notch 70, the pinions 78 and 79 communicate the required drive to the shaft 26b. When sin ° is negative, a cam 97 geared to the course cam 33 engages a finger 98 on the support 83 and holds the latter permanently in the disengaged position whilst a duplicate mechanism drives the shaft 26b with the interposition of a reversing gear 99. Since the mechanism F only engages and drives the shaft 26b during one half of each revolution of the shaft 30 a similar mechanism G for supplying the correction corresponding to the component of the wind speed may engage and drive the shaft 26b during the other half.