GB408702A - Speed indicator - Google Patents

Abstract

408,702. Speedometers. SALOMON, F. M. M. B., 3, Rue de l'Universite, and GOVARE, H. P., 4, Rue Guy de Maupassant, both in Paris. Oct. 20, 1932, No. 29411. Convention date, Dec. 7, 1931. [Class 106 (iii).] A casing having a dial disposed perpendicular to its axis encloses an instantaneous speed indicator, a mean speed indicator and clockwork, all mounted behind the dial, the instantaneous and mean speed indications being shown adjacent, for example coaxial, on the same dial ; the mean speed indicator utilises the pivoted link differential mechanism described in Specification 408,803, having longitudinal spindles for returning the time and distance elements to zero. The instantaneous speed indicator may be of the centrifugal type disclosed in Specification 375,315. In the arrangement shown in Fig. 3, the instantaneous speedometer I, the mean speed indicator O and the clockwork H are carried by pillars 80<a> within the casing 75 having at the open end, a dial, with time and distance zeroizing spindles 88, 100 projecting at the sides of the dial. In a modification, the components O and H may be arranged side by side behind the component I. The arrangement of Fig. 3 is shown in detail in Fig. 4. The driving shaft 1 of the instantaneous speed indicator drives through worm gearing a spindle 14 which, through further worm gearing 15, 16, drives the general distance totaliser 33 and the daily totaliser 34. The distance cam 65 of the link differential mechanism described in Specification 408,803 and forming the essential component of the mean speed indicator, is driven at very reduced speed from the totalizer spindle through worm gearing 86, 87, a vertical spindle 88 and toothed gearing 89, 90. The spindle 88 can be moved out axially to disengage the worm gear 86, 87 and then rotated by the knob 102, to return the distance cam 65 to zero. The time cam 65<1> is rotated by a spring and is controlled by an escapement, the cam being secured to a spindle, which carries the gear wheel 94, and the inner end of a spring contained in the fixed barrel 92. The wheel 94 meshes with a wheel (not shown) mounted on a spindle carrying the wheel 98 which is in constant engagement with the wide gear wheel 99 on the end of the time zeroizing spindle 100. When the spindle 100 is pushed inwards by the knob 101, the gear wheel 99 meshes with gear wheel 97 connected by the wheel 96 and a series of wheels (not shown) with an escapement, so that the time cam 65<1> is then rotated by the spring at a definite speed. When the spindle 100 is withdrawn, as shown, the gear wheel 99 is clear of the wheel 97 and the escapement is disconnected so that the gear wheel 94 may be rotated by rotation of the knob 101 thus winding up the spring and zeroizing the time cam. To prevent back rotation of the gear wheel 94 during the winding, the gear 99 is connected by gearing 103, 105 to a ratchet wheel 108 engaged by a pawl which is put out of action by a cone 107 on the spindle 100 when the spindle is pushed in to put the escapement in gear.