GB452324A - A system of retractable landing gear for aeroplanes - Google Patents

Abstract

452,324. Retractable undercarriages for aircraft. SOC. D'INVENTIONS AERONAUTIQUES ET MECANIQUES S. 1. A. M., 1, Route des Alpes, Fribourg, Switzerland. April 16, 1935, No. 11736. Convention date, Jan. 12. [Class 4] In a retractable landing gear for aeroplanes of the kind in which a wheel or the like is carried by a leg constituted by two hinged members, one of which acts as a pneumatic or oleo-pneumatic shock-absorber, the movement of the leg is guided during retraction and extension by a directing bar of constant length hinged at one end on a fixed point on the aeroplane and at the other on the non-mobile (cylinder) member of the shock absorber. In one form, Figs. 1 and 2, a wheel 1 is carried by a leg 2, pivotally mounted on the aircraft structure at 3 and constituted by two elements hinged together at 6, the lower element consisting of a shock absorbing strut comprising a cylinder c and piston p. A directing bar 9 is pivoted at 8 to the aircraft structure and at 7 to the cylinder c of the shock absorber. Retraction and extension are effected by means of a jack 10 pivoted to the aircraft structure at 11 and to cylinder c at 12. In another form, Fig. 2, retraction and extension ace effected by a jack 13 pivoted at one end on a fixed point 14 and acting at the other on a hinge 15 provided in an auxiliary leg 16-16. According to the Specification as open to inspection under Sect. 91, the wheel carrying member 2 might be constituted by any device of elastic character or otherwise. This subject-matter does not appear in the Specification as accepted.