US 1524712 A
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D. A. HURD WINDMILB Filed Dec. 12; 1322 5 Sheets-Sheet 1 D. A. HURD WINDMILL Filed Dec. l2. 9 5 Sheets-Shet 2 Feb. 3, 1925- 1,s24;712
.- D. A. HURD WINDMILL med Dc'. 12, 1922 a Sheets-Sheet :s
Patented Feb. 3, 1925.
UNETE STATES DEMETRIU'S A. HUBD, F BERTRAND, NEBRASKA.
Application filed December 12, 1922. Serial No. 606,538.
T 0 all whom it may concern.
' Be it known that I, DEMETRIUS A. I-IUnD, a citizen of the United States, residing at Bertrand, in the county of Phelps and State of Nebraska, have invented new and useful Figure 3 is a plan View of the deck and collar,
Figure 4 is. a vertical sectional View through the spider and collar, showing the mounting of the shaft,
Figure 5 is a. detail perspective view of the outer end portion of one of the carrier arms and the blades thereon,
Figure 6 is a side elevation of the same, with the blade bearings in section.
Figure 7 is a perspective view of the outer end of one of the arms and the supporting bracket for the vertical spindle thereof,
Figure 8 is a detail sectional View of the lower end of one of the spindles and the adjacent portion of the blade thereon,
Figure 9 is a plan view of the spider.
In the structure disclosed, concrete bases 10 support upwardly converging posts 11, the upper ends of which are connected by brackets 12 with a deck 13. A vertical shaft 14 has a step bearing 15 on a concrete base 16, and has fixed thereto a collar 17 rotatably mounted in the deck.
The shaft 14 projects above the deck and has secured to its upper end a spider 18 having radial extensions 19. Secured to these extensions are arms 20 disposed radially to the shaft and rotatable therewith. The outer ends of these arms are connected by stay rods 21. A rotatable carrier or driving member is thus produced.
Secured to one side of the outer end of each of the arms 20 is a bracket 22, in which is mounted a vertical spindle 23 that extends above and below the arm. This spindle has a flange 24 between its ends that, rests upon the bracket. It is also provided at its lower end with a supporting nut or flange 25. A set of propeller blades 26 and 27 is carried by each arm, each of said blades being preferably of sheet metal formed at one end with a sleeve 28 that receives the upper or lower end of the spindle. The blades are thus free to swing on the spindles 23 as pivots, the arms 20 being out of the paths of said blades.
An abutment latch is employed for each set of blades 2627, and consists of a lever 29 pivoted, as shown at 30, on the arm 20. One end of this lever is provided with a vertical bar 31, having ofiset abutments 32 located above and 'below the arm 20, and normally disposed in the path of the blades 26 and 27 carried by said arm. A spring 7 33, coiled about)the pivot 30 and bearing against the bar 31, serves to yieldingly urge the latch to a position with the abutments i 32 behind the blades. The leveralso has an outstanding arm on the opposite side to the bar 31, which lever is provided with a releasing weight 34. The latch bars 31 have secured to them cords or cables .35, which extend through openings 36 in the collar 17, said cords or cables having their lower ends suitably secured to the shaft 14, the shaft preferably carrying a cleat or other fastener 37 for the same.
Each of the upper blades 27 has a keeper 38 in which is pivoteda vertically suspended rod 39 that bridges the space between the blades and overlaps the lower blade.
In operation assuming the latch abutments inv their active positions, it will be evident that when wind is blowing, as for example in the direction of the arrow in Figure .2, the blades on the left hand side will be held by the abutments of the latches, so that said blades will cause the rotation of the mill and the shaft 14. The blades on the right hand side, however, are free to swing rearwardly so as to afford little resistance to this rotary movement. Should a high wind occur that would cause the mill to rotate at an excessive speed, the weighted arms under the influence of centrifugal force will swing outwardly against the action of the springs 32, and thus release the normally active blades, which would swing to the dotted position, shown at the upper end of Fig. 2. When so positioned, it will be evident that the bars 39 will strike the stays 21 and consequently as the released blades move against the wind, they will effect resistance, acting in the nature of brakes or drags upon the mill until its speed is again reduced to normal, whereupon the springs 33 will react to bring the latchesinto their normal positions, thus again bringing the blades into operation. Power may" be transmitted 'from themill byv any suitable means, in this case, a drive pulley'tO being shown. on the lower portion of the shaft From the "foregoing, it'is thought that the construction operation, and many advantages of the herein described invention will be. apparent ticthose skilled in theart, without further description and it will be. understood that various changes in the size, shape, proportion and minor details ofconstructi on may be resorted to without depart. ing from the spirit or sacrificing any of the advantages of the invention.
What I claim, is: V
1. In an apparatus of the, character described, the combination with supporting frame, of an upright sliatt journ'aled there in, a set of outstandingarms carried by, the shaft a plurality of upright blades pivoted. on the arms, a, plurality of abutment latches pivoted to the arms and having Portions located normally in the paths of the blades,
springs for 'yieldingly, holding said latches in said paths; and welghted outstanding arms carried by the latches and-operating by" centrifugal force to swing..the latches out of the paths of the blades when the shaft and arms rotate at excessive speeds.
In an apparatus of the character set forth, the combinationwith a rotatable carrier including radial arms,"feathering blades pivoted on the arms, abutment latches for holding the respective blades in their active positions, means for moving the latches to release the blades stays connecting the outer ends of the arms outsidev the blades,-'- and means carried by the blades andabutting against thestays to limit the outward swinging movements of theblades when free of" the latches.
3. In an apparatus of the character set forth, the combinationwith a supporting 'l'rame, of an upright shaft journaled therein, radial arms carried by the upperend oi the shaft, upright spindles mounted on the outer ends of the arms, swingingcblades on the spindles aboveand below the arms, abutment latches on the arms that engage the blades and normallyihold the same in active positions, centrifugally operated weighted arms for independently and automatically swinging the latches to release the. arms, stays connecting the outer ends of the arms outside the blades, and stop rods carried by the blades and abutting against the stayswhen the blades are released and swinging outwardly, to limit the swinging movements of said blades...
DEMETRIUS A; HUB-D.