Patent GB-190906418-A (GB)
Title: Improved Means for Actuating Oscillating Lever-arms, Propellers and the like.
Inventor: COOPER BERTRAM GEORGE
IPC: F16H21/46
Filed: 1909-03-17
Granted: 1910-03-17
Abstract: 6418. Cooper, B. G. March 17. [Cognate Applications, 6970/09 and 7618/09.] Tilting or undulating vane apparatus. - Relates to mechanism for causing an oscillating propeller blade, for propelling or circulating fluids &c., to move in a figure-of-eight path, as described in Specification 3269/08. In the construction shown in Figs. 1 and 2, a motordriven shaft a is formed with a Z - crank, of which the oblique crank-pin a' is embraced by a boss b<1> of a propeller blade b, which is pivoted in a universal manner to a frame plate c by means of a fork d, and stud - screws e, the axes of the fork d, the screws e, the crank-pin a', and the shaft a intersecting at a common point. In the modification shown in Fig. 3, the Z-crank is replaced by an obliquely-arranged disk, on which is freely mounted a strap g forming the boss of the propeller blade b, ball bearings being interposed. The inclination of the disk may be adjusted by means of a lever-operated sliding sleeve i and a jointed link j, thus enabling the amplitude of the figure-of-eight orbit to be varied to zero. In a further modification, the universal pivot of the blade b consists of a ball-and-socket joint, the boss b<1> forming the socket, such boss being provided with an arm carrying a roller running in a guide-race. In another form, the oblique crank-pin a<1> is hinged to the shaft a, its other end being adjustable by means of a nut-andscrew mechanism, thus enabling its obliquity to be varied. In another method of constructing the universal pivot of the propeller blade, the boss b<r> is formed with two horizontal arms carrying conical rollers, which are guided in circular horizontal races secured to the frameplate. Means are described for enabling the propelling force, instead of being exerted in a direction at right-angles to the motor-driven shaft, to be exerted in the direction of the shaft or at a variable angle oblique thereto on either side of a vertical plane through the axis of the shaft. In the form shown in Figs. 11 and 12 for thus changing the line of thrust, the figure-ofeight oscillation is repeated, by a depending blade shank s, which is universally pivoted to the frame c, the angular oscillation of the fork d being transmitted to the corresponding lower fork d', and the vertical movement of the crankpin a<1> to a lever arm s<1> by links t<1>, t<2> connected by a sleeve t. The forks d, d<1> are adapted to be angularly displaced the one relatively to the other by means of a sleeve u having internal right and left handed screw-threads. In another modification, the propeller blade is arranged to be feathered independently of the orbital motion by the action of the fluid pressure on the blade, which is secured to its shank in a one - sided manner, the shank being pivotally mounted in the boss b<1> and its angular oscillation controlled by springs. A pair of propellers may be arranged on the same shaft with their actuating-cranks obliquely inclined in opposite directions. Specification 12,509/94, [Class 114, Ships &c., Div. II.], is also referred to.