GB425870A - Device for reversing the propeller of aircraft - Google Patents

Abstract

425,870. Reversing-gearing. BONGIOVANNI, L., 1, Piazza Vittorio Veneto, Turin, Italy. Aug. 10, 1934, No. 23142. Convention date, Aug. 11, 1933. [Class 80 (ii)] In an arrangement for reversing the rotation of the propeller of an aircraft to facilitate landing, a gear wheel 4 secured to the driving shaft 2 meshes with planet wheels 5 mounted on axles 6 in a spider 7 and has teeth 4<a> normally in engagement with teeth 10<a> of a disc 9 slidably mounted on the shaft 2. To effect the normal operation of the propeller, the disc 9 is moved towards the wheel 4 until outer teeth 10<b> engage with teeth 7<a> of the spider 7 so that the gear wheels 3, 4, 5 and propeller shaft 1 are driven as a single unit. The reversal of the propeller is controlled by a lever which through Bowden wire mechanism rotates a member 14 carrying an eccentric 13 operating brake shoes 11 associated with the spider 7. The shaft of the eccentric also carries a sleeve 15 having a slot 15<1> partly circular and partly helical engaged by a pin 16<1> on an operating arm 16 of the disc 9. When the teeth 7<a>, 10<b> are moved out of engagement, the planets 5 roll idly on the wheel 3 until the brake has been applied to the spider 7 when the shaft 1 is reversed through the gear train 3, 4, 5. The engagement and disengagement of the clutch teeth 7<a>, 10<b> is facilitated by opening the ignition circuit of the engine during the movement of the control lever, (Fig. 3 not shown), from one position to the other.