DE242721C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

te 242721 CLASS 77h. GROUP

Drive device for the flapping wings of aircraft.

Patented in the German Empire on September 16, 1909.

recognized on the basis of the registration in France on March 20, 1909.

With such aircraft, which are provided with flapping wings, you already have them driven by means of an articulated square, with one corner of the square constantly rotating Movement receives, while the wing attached to the four-bar linkage such moving up and down receives that that from above downwards with others Speed than that from bottom to top. According to the present invention one side of the square is extended beyond one corner and the Wing attached, which measure it with a suitable choice of the size of the side extension and the square sides allow a great difference between the two speeds to achieve with which the wings move up and down; The relationship the mean speeds downwards and upwards can be approximately 1: .3 will. Furthermore, this arrangement makes it possible to use the fixed corners of the hinge quadrilaterals to be relocated in the central plane of the machine, whereby the whole construction of the same is facilitated and simplified.

In the drawing, FIG. 1 explains the theory of the movement mechanism, FIG. 2 3 and 3 show, in partial longitudinal section and side view, a device arranged according to the invention Flying machine.

With α and b the fixed corners of a joint quadrangle are called, with c and d the changeable in their position; the side cd is extended over the hinge point d to e . If side bc, which is smaller than ad, is set in constant rotary motion, point d describes an arc of a circle and point e describes a closed curve. If the various parts are given suitable proportions, the path of point e is a curve ef gh, one half of which efg roughly represents an arc of a circle, while the other half is straight. The most suitable ratios are as follows:

ad = cd = de '■ == ■

3 +

bc;

bc.

35

40

45

The non-uniform speed of the point e in its path is such that it passes through the part efg in the time in which the point c covers approximately a quarter circle cij, whereas the other part of the curve gh e of e is covered in the time in which the point c circumscribes the arc jkc. It follows that the mean speed of the point

Claims (1)

tes e on the route efg is about three times as large as on that gh e . It is evident, however, that these relationships are not the only decisive ones, but only represent an exemplary embodiment. With m η a wing is referred to, which is articulated with one edge on a fixed axis ο and at a suitable point by a hinge piece ft with the hinge point e of the quadrilateral ίο is connected. The wing follows the movements of point e and therefore has a greater angular velocity when descending than when ascending, provided that the path ef gh is traversed in the specified sense. Instead of moving the axis 0 in the plane of the wing itself, it can also be arranged below or above this plane, the wing being connected to the axis rigidly or by a tie rod or in some other way. In the exemplary embodiment according to FIGS. 2 and 3, the axis 0 is mounted in a frame-like frame parallel to its longitudinal direction and two pairs of wings m η arranged one behind the other are articulated to the axis. Below the axis 0 is another axis a, parallel to the former, which carries the arms α d. The bevel gears V are mounted below the axis α; these are in engagement with the mating wheel 1, so that the two wheels rotate in opposite directions. The wheels 1 are driven by the specified transmissions from the engine 2. Each of the wheels δ 'is provided with a crank pin c to which the rods are connected; the arms ad grip the rods cd e in their centers. The outer ends of the arms ede are connected to the wings m η by articulated rods ft. With this explanation given, it can be seen that each wing goes down faster than it goes up; the crank pins c are arranged in such a way that the two wings of one pair each lower and also raise at the same time, whereas the movements of the wings of the two pairs take place in their direction opposite to each other j. In this way the same thing becomes-! weight of the machine with respect to both the axis of symmetry, length and width. A very simple stop device can be provided to stop the wings after they have traveled halfway, ie when they are in a horizontal position, for the purpose of securing the flat spread of the wing surfaces in the end position. The equilibrium is also secured by the horizontal rigid surfaces s s' arranged one above the other. The surfaces t which can be rotated about their vertical axis serve as a control for changing the horizontal direction of travel, while the rise and fall is caused by a corresponding control, also by relocating the center of gravity of the machine. The wings can have any useful shape, flat or curved, and can be built according to the type of reinforced girders or otherwise, be of the single or multi-faceted type; the same can have more or less inclination to the longitudinal axis of the machine, be at different heights to each other, etc. Likewise, the wings can be provided with devices that allow the skewed design of their surfaces, adjustment of the same to the wind direction, the change of mutual position, furthermore the flying machine also have wheels for initiating the flight movement and ■ ^Lan] dung. PateNT CLAIM: Drive device for the flapping wings of aircraft, in which the wings are moved up and down at different speeds by arranging a hinge square, characterized in that the link (cd) connecting the two arms of unequal size (bc and α d) of the hinge square by approximately its own length is extended and the wing is attached to the outer end (e) of this extension (de). 1 sheet of drawings.