GB759567A - Device for transmitting motion from a control member to a controlled member - Google Patents

Abstract

759,567. Controlling aircraft. GIRAVIONS DORAND. July 22, 1954 [Aug. 5, 1953], No. 21430/54. Class 4. A control aid to be interposed between a control and a controlled member, e.g. the control column and a movable surface in an aircraft, comprises a correction system including retarding means 1 (Fig. 4) directly interposed between said control and controlled members 5 and 6, adapted to connect the same in a substantially positive manner during quick displacements of the control member 5, a displaceable anchoring member 46 and first return-to-neutral elastic means 2 connected between member 40 and controlled member 6, and a resetting system including means to shift said anchoring member 46 with respect to said controlled member 6 in the direction in which the latter has been displaced by said control member 5, the shifting means comprising second return-to-neutral elastic means 2<SP>1</SP> operatively connected between said control member and said anchoring member and retarding means 11 to control the action of said second elastic means on said anchoring member. In Fig. 4, each retarding means comprises a dashpot. In operation, a displacement of member 43 to which rod 5 is secured, results in the first instance in a similar displacement of member 6, putting spring 2 in tension. The spring will then contract, under the retardation of dashpot 1, 4 and member 6 is slowly returned to its former position. In the meantime, rod 51 also secured to member 43, has compressed spring 2<SP>1</SP>, which under the retardation of dashpot 11, 4<SP>1</SP> sets a new neutral position of the anchoring plate 46, which has an aperture 47 for the free passage of rod 5. The neutral position of rod 6 to which it is returned by the system of spring 2 and dashpot 1, 4 is thus reset by the anchoring plate 46. The time constant of spring 21 and dashpot 11, 4<SP>1</SP> is preferably greater than that of spring 2 and dashpot 1, 4. In Fig. 6, the dashpot 1, 4 is replaced by a rotary dashpot 17, and the dashpot 1<SP>1</SP>, 41 by a flywheel 16. The spring 2<SP>1</SP> acts on a rack 13 adapted to rotate a cog 14 on a shaft 15 carrying the flywheel 16 and a worm 18, rotation of which traverses a nut 14 forming the anchoring member for spring 2. In Fig. 5 (not shown), a modification of Fig. 6, the dashpot 1, 4 of Fig. 4 is retained and the dashpot 1<SP>1</SP>, 4<SP>1</SP> is replaced by a rotary dashpot, and irreversible gearing comprising two-worm mechanism is disposed between shaft 15 and the anchoring member of spring 2. In Fig. 7 (not shown), a further modification of Fig. 6, the dashpot 1, 4 is retained, and the nut 19 acts on spring 2 through a bell-crank lever.