US3526363A - Sprinkler - Google Patents

Description

United States Patent 3,526,363 SPRINKLER Fred Hauser, 1544 Midvale Ave., Los Angeles, Calif. 90024 Continuation of application Ser. No. 759,479, Sept. 12, 1968. This application Aug. 19, 1969, Ser. No. 852,978 Int. Cl. Bb 3/00 US. Cl. 239-206 9 Claims ABSTRACT OF THE DISCLOSURE A pop-up type of water sprinkler in which a water operable motor drives a rotatable sprinkler head, in an os cillating part-cycle motion discharging water over a particular arcuate sector. The size of such sector may be manually adjusted during operation of the sprinkler.

This application is a continuation of Ser. No. 759,479 filed Sept. 12, 1968, now abandoned.

Certain sprinkling installations make it highly desirable to have a sprinkler device which is adjustable, preferably during operation, so as to sprinkle only over a selected area. Most prior art sprinkler devices which have employed fluid motor means to rotate the sprinkler head, have not been easily adjustable so as to vary the extent of the arc of rotation or oscillation of the sprinkler head and the stream of water ejected therefrom. It is therefore a principal object of this invention to disclose and provide a universally adjustable sprinkler which overcomes all of the foregoing shortcomings of the prior sprinkler devices.

This invention is an improvement on the sprinkler disclosed in my United States Pat. No. 3,383,047, granted on May 14, 1968.

A primary object of the present invention is to disclose and provide a sprinkler device in which a sprinkler head is reversibly rotated within an adjustable are or part cycle rotation so that the size and location of the area to be covered by the water ejected from the sprinkler head may be readily adjustable even while the sprinkler is operating.

It is another object of the present invention to disclose and provide a sprinkler device in which the power developed by a fluid motor within the sprinkler provides rotation for the sprinkler head through a direct drive and which is reversible in direction in response to the arcuate position of the sprinkler head.

It is a further object of the present invention to disclose and provide a sprinkler device as in the preceding objects wherein the means for reversing the direction of rotation of the fluid motor includes over center actuating means and means for adjusting the arc of rotation of the sprinkler head during each oscillation thereof.

Generally stated, the sprinkler device of the present invention includes a housing having a Water inlet and a sprinkler head having a Water outlet in fluid communication with the housing inlet, means for rotatably mounting the sprinkler head, fluid impact motor means operable by water admitted to the housing inlet for rotating the sprinkler head, and means for reversing the direction of rotation of the fluid impact motor including water flow directing provisions responsive to the arcuate position of the sprinkler head. The invention further contemplates the provision of means for externally adjusting the arcuate movement of the sprinkler head so as to vary the arc of rotation between reversals thereof during operation.

3,526,363 Patented Sept. 1, 1970 Other objects and various advantages of the sprinkler device of the present invention will become apparent to those skilled in the art from a consideration of the following detailed explanation of exemplary embodiments thereof and reference to the appended sheets of drawings.

In the drawings:

FIG. 1 is a vertical section view of a first exemplary embodiment of a sprinkler device constructed in accordance with the present invention;

FIG. 2 is a partial view of the sprinkler device of FIG. 1 with the sprinkler head in retracted position;

FIG. 3 is a sectional view of the embodiment shown in FIG. 1 taken along the plane 33;

FIG. 4 is a sectional view of the embodiment shown in FIG. 1 taken along the plane 44;

FIG. 5 is a sectional view as in FIG. 4 illustrating the components in another position;

FIG. 6 is a sectional view of the embodiment shown in FIG. 1 taken along the plane 6-6;

FIG. 7 is a sectional view of the components of FIG. 6 taken along the curved plane 77;

FIG. 8 is a sectional view of the embodiment shown in FIG. 1 taken along the plane 88;

FIG. 9 is a sectional view of the embodiment shown in FIG 1 taken along the plane 99;

FIG. 10 is a partial sectional view of the embodiment shown in FIG. 1 taken along the plane 1010;

FIG. 11 is a vertical sectional View of a second exemplary embodiment of the sprinkler device constructed in accordance with the present invention; and

FIG. 12 is a sectional view of the embodiment shown in FIG. 11 taken along the plane 1212.

Referring now to FIGS. 1 through 10, a first exemplary embodiment of a sprinkler for discharging water over a selected variable area is illustrated. Generally stated, the sprinkler device includes a main housing 20 in which is disposed for vertical and rotatable movement a sprinkler head, indicated generally at 50, mounted on means, indicated generally at 70, for rotatably supporting the sprinkler head, and fluid impact motor means, indicated generally at 80, operable b water admitted and discharged through the sprinkler device. The motor means rotates the sprinkler head 50 through direct drive transmission means, generally indicated at 90, and the sprinkler device includes means, indicated generally at for reversing the direction of rotation of the sprinkler head 50. Means 100 for reversing the direction of the sprinkler head includes water flow directing means, generally indicated at 102, and over-center actuating means, generally indicated at 120. The sprinkler device also includes means indicated generally at 140, for adjusting the arc of rotation of the sprinkler head 50, which may be performed during operation of the sprinkler device.

The sprinkler housing 20 contains all operating parts therewithin when the sprinkler is not in use, and comprises a lower housing section 21 including a centrally disposed water inlet opening or fitting 22 having internal threads 23 for mounting the sprinkler main housing to the free end of a Water pipe embedded or recessed in the ground at the location where the sprinkler device is installed. Housing 20 also includes tubular sidewall section 24 and a cover or upper housing section 25 threadedly connected to the upper end of the sidewall section 24, and sealed by a conventional O-ring 26 so as to provide a water-tight enclosure. Upper housing section 25 includes an opening 27 for receiving sprinkler head 50.

Within the main housing 20, the sprinkler device is provided with an inner housing, indicated generally at 28, seated on a conventional O-ring 29, and forced downward against the O-ring by cover 25 bearing down on sleeve 30. The inner housing 28 comprises a cylindrical sidewall 31 and a bottom wall 32 having a centrally located threaded opening 33 and substantially diametrically spaced throughbores 34, 35. Inner housing 28 also includes a top wall 36 having a central opening 37 and substantially diametrically oppositely spaced through bores 38, 39. Top wall 36, as seen in FIG. 9, has arcuate openings 36 through which the water passes upwardly. The bottom, side and top walls of inner housing 28 defines a motor chamber indicated at 40.

The top wall 36 of inner housing 28 is provided with an integral cylindrical sidewall 41 and an upper wall 42 defining a chamber 43 enclosing direct drive transmission means 90. The upper wall 42 of the transmission means enclosure supports an upstanding open-ended cylinder 44 for rotatably receiving the means 70 for rotatably mounting the sprinkler head.

The sprinkler head, indicated generally at 50, includes a housing having an upper cylindrical portion 51 and an enlarged lower portion 52 defining a shoulder 53. The sprinkler head housing defines a chamber 54 in fiuid communication with the body of the main sprinkler device housing 20 and with a water outlet opening 55. The sprinkler head is received in opening 27 of cover 25 of the main housing and is free for rotatable and slidable movement. A thrust bearing 56 circumscribes the upper cylindrical housing portion 51 of the sprinkler head resting upon shoulder 53 and supports an annular bearing plate 57. A conventional O-ring 58 is positioned above the bearing plate 57 so as to provide a water-tight rotatable seal for the sprinkler head 50.

Means, generally indicated at 70, for mounting the sprinkler head 50 for rotation and vertical axial sliding movement is provided to allow the sprinkler head 50 to pop up and rotate during operation of the sprinkler device. In the exemplary embodiment, such means includes a cylindrical or tubular member 71 rotatably supported at its lower end in the upstanding open-ended cylinder 44 integral with the upper wall 42 of the transmission means enclosure 43. Tubular member 71 is provided with a longitudinally extending keyway 72 as seen, for example, in FIG. 8.

Means is also provided for adjusting the sprinkler head 50 relative to the cylindrical or tubular member 71 and, in the exemplary embodiment, such means comprises a disc 73 non-rotationally engaging tubular member 71 through keyway 72. The disc 73 is disposed within the chamber 54 of sprinkler head 50 and is retained therein through snap ring 74 (see FIG. 8). Disc 73 is provided with a plurality of circumferentially spaced water passages 75. An externally accessible adjustable screw 76 is threadedly mounted within the sprinkler head housing for rotatably adjusting the sprinkler head 50 relative to the disc 73 and tubular member 71. Specifically, the screw 76 may be tightened by a screw driver from above the sprinkler device so as to bear upon the disc 73 fixing these components in relation to one another.

Fluid impact motor means, indicated generally at 80, and operable by the water passing through the sprinkler device is provided for rotation of the sprinkler head 50. In the first exemplary embodiment, such fluid impact motor means comprises water turbine means including a hub 81 supporting a plurality of vertically disposed turbine blades 82. The turbine hub 81 is mounted through a lock screw to shaft 83 received in a mounting nut 84 threaded into the opening 33 in bottom wall 32 of the inner housing 28. The upper end of shaft 83 is journalled in opening 37 of top wall 36 of the inner housing.

Direct driven transmission means, indicated generally at 90, is disposed within the above-described housing chamber 43. In the exemplary embodiment, the trans mission means comprises a conventional gear reduction The sprinkler device of the present invention provides oscillatory or part cycle arcuate movement of the sprinkler head so as to discharge water over an adjustable arcuate sector of lawn. Means, indicated generally at 100, is provided for reversing the direction of rotation of the sprinkler head 50 and includes water flow directing means, generally indicated at 102. In the exemplary embodiment, means 102 comprises a pair of water directing turret means 103, 104 for driving the water turbine means in either direction. Turret 103 includes a hollow cylindrical body 105 having a Water inlet 106 at the lower end thereof and a longitudinally vertically extending shaft 107 at the other end. The lower end of cylindrical body 105 is journalled in through-bore 34 of bottom wall 32 of inner housing 28; the upper end or shaft 107 is journalled in through-bore 38 in top wall 36 of inner housing 28. The cylindrical body is provided with a longitudinally extending water discharge slot 108, as seen in FIG. 10. Similarly, water directing turret means 104 includes a hollow cylindrical body 109 with a water inlet 110 at the lower end thereof, a stub shaft 111 at the upper end, and a water discharge slot 112. The cylindrical body 109 is journalled in through-bore 35 of bottom wall 32 and the shaft 111 is journalled in the top wall 36 of the inner housing 28. As seen best in FIG. 3, the lower end of turret bodies 105, 109 are provided with gear segments 113, 114 respectively. Pivotally mounted on nut 84 of the water turbine means is a double-ended gear segment 115, each end of which engages one of the water turret gear segments 113, 114. It will therefore be understood that rotation of water turret means 103, through double-ended gear segment 115 will eifect rotation of the other water turret means 104 in like amount. Stop means comprising stop pins 116, 117 are mounted in bottom wall 32 of inner housing 28 to limit the maximum arcuate movement of gear segment 115.

The means 100 for reversing the direction of rotation of the sprinkler head also includes over-center actuating means, generally indicated at 120. In the exemplary embodiment, such means comprises a first arm 121 secured to the upper end of the turret shaft 107 by nut 122. Arm 121 is bifurcated at its free end. A second, curved arm 123 is pivotally mounted on the side opposite the center axis of the sprinkler device from shaft 107 through a pivot pin 124 and carries a first pin 125 on the free end thereof for interconnecting the first arm 121 and the second arm 123. A third arm 127 is pivotally supported on the upstanding open-ended cylinder 44 (supporting tubular member 71) through retainer or snap rings 128, 129. The free end of third arm 127 carries an actuating pin 130. A pair of stop pins 131, 131' (see FIG. 4) extend upwardly from upper wall 42 of the transmission housing limiting arcuate movement of pin and therefore arm 127. A fourth arm 132, including a depending element 133, is fixedly mounted on tubular member 71 through keyway 72 in a plane horizontally disposed above arm 127. Fourth arm 132 therefore moves with rotational movement of tubular member 71. The depending element 133 of fourth arm 132 is adapted to selectively contact the upper end of actuating pin 130 on one side thereof so as to move the pin and arm 127 in one arcuate direction, counter-clockwise as viewed in FIG. 5. The interconnecting pin 125 and actuating pin 130 are constantly urged toward one another through spring member 134.

Means, indicated generally at 140, is provided for adjusting the arc of rotation of sprinkler head 50 and is positioned within the housing 20 in a plane above and immediately adjacent the fourth arm 132 of the reversing means. In the exemplary embodiment, such means 140 comprises an internal gear 141 mounted on tubular member 71 and free to rotate thereon. Ring 142 is fixedly mounted on tubular member 71, below internal gear 141 and above fourth arm 132, through an adjusting screw 143 engaging keyway 72. As seen in FIG. 6, an arcuate sector notch 144 is formed in tubular member 71 in the plane of ring 142. Tubular member 71 carries internally the longitudinally extending pinion gear 145 which engages an idler gear 146 carried by ring 142. Internal gear 141 is retained against upward sliding movement on tubular member 71 by retainer ring 147. Pinion gear 145 is connected through shaft 148 to an adjustment screw 149 for manually externally varying the arc of rotation or oscillation of sprinkler head 50. Screw 149 includes a slot 150 for receiving a screw driver and is axially retained within upper housing 51 of sprinkler head 50 by means of a retainer screw 151.

A pin 152 mounted in the peripheral rim of gear 141 depends downwardly therefrom. Pin 152 selectively contacts third arm 127 so as to adjust clockwise rotation of such arm.

Operation of the sprinkler device will now be described with particular attention directed to FIGS. 4, and 6 showing the means 100 for reversing the direction of the sprinkler head. Water enters the sprinkler device through inlet 22 and passes into the water-directing turrets 105, 109 through inlets 106, 110. Assume that the turrets are positioned as shown in FIGS. 3 and 10 so that the water discharged through the slots 108 and 112 rotate the water turbine means in a clockwise direction by impingement of the water on the turbine blades 82. The water then passes upward through the housing through openings 36' and into the chamber 54 of sprinkler head 50 through opening 75 in disc 73 and is discharged through opening 55 in the sprinkler head housing. When the water-directing turrets 105, 109 are in the position as shown in FIGS. 3 and 10, so as to rotate the turbine head clockwise, the components of the means for reversing direction of rotation of the sprinkler head are as shown in FIG. 4. Specifically, first arm 121 is pivoted to its limit in the counter-clockwise direction. Meanwhile, third arm 127 may be assumed to be at approximately the starting point of the clockwise arc of rotation of the sprinkler head. At this position, spring 134 is flexed outwardly urging interconnecting pin 125 and actuating pin 130 toward one another on the upper side (as viewed in FIG. 4) of the axis of pivot pin 124 of second arm 123. The over center distance is indicated at A.

As the sprinkler head 50 and tubular member 71 rotate clockwise, adjustable stop pin 152 on internal gear 141 engages third arm 127 causing clockwise rotation of such arm to the position indicated in FIG. 5. It will be appreciated that when the imaginary line between pins 125 and 130 moves below the axis of pivot pin 124, spring 134 will then urge the pivot pins 125 and 130 toward one another but on the opposite side of the pivotal axis 124 causing quick pivotal movement of second arm 123 and rotation of first arm 121, as seen in FIG. 5. Consequently, the water turret means 103 is rotated to a second position wherein the water discharge from the slots 108, 112 causes counter-clockwise rotation of the turbine means and therefore the sprinkler head. Of course, pivotal movement of turret 105, through gear segment 115, effects like pivotal movement of the other turret 109.

Clockwise pivotal movement of third arm 127 has been limited through actuating pin 130 striking the stop pin 131. The counter-clockwise rotation of the turbine means and the sprinkler head will now cause the depending element 133 of fourth arm 132 to strike the upper end of actuator pin 1'30 thereby rotating third arm -127 counter-clockwise until pin 130 strikes limit pin 131'.

The are of rotation of the sprinkler head may be adjusted by changing the angle subtended by the fourth arm 132 fixed to tubular member 71 and a line drawn through the axis of tubular member 71 and stop pin 152, mounted on gear 141. The adjustment of this angle may be accomplished by rotating the screw 149. As previously described, such rotation causes gear 141 to rotate relative to the tubular member 71. A clockwise rotation of the screw 149 causes gear 141 to rotate in counter-clockwise direction. This increases the angle subtended by the fourth arm 132 and the pin 152. Opposite rotation of the screw 149 decreases this angle. Rotation of the screw 149 may readily be accomplished while the sprinkler is in operation.

As previously indicated, the sprinkler head may be rotated with respect to tubular member 71 by loosening screw 76, rotating the sprinkler head housing, and tightening the screw 76 to lock the sprinkler head housing relative to disc 73.

It is contemplated that sprinklers of the above-described type may be manufactured for sprinkling over a full circular area. In such event, the housing 20, sprinkler head 50, and motor means 80 may be utilized while the reversing means and adjusting means are deleted so as to provide economy in manufacture while maintaining versatility in application.

Referring now to FIGS. 11 and 12, there is shown a second exemplary embodiment of a sprinkler device including a main housing, generally indicated at 160, a sprinkler head indicated generally at 180, fluid impact motor means operable by water, indicated generally at 190, and means for reversing the direction of rotation of the sprinkler head, generally indicated at 200. The main housing includes a base section 161 having a centrally disposed, internally threaded water inlet opening 162, a tubular sidewall section 163, and a cover section 164 threadedly connected to the upper end of sidewall 163 and sealed through a conventional O-ring 165. Cover 164 includes a centrally disposed opening 166 for receiving sprinkler head 180.

Within main housing 160, there is provided an inner housing 167 including a bottom wall 168, an integral cylindrical sidewall 169, and an upper wall 170. Inner housing 167 defines a chamber 171 enclosing means 200 for reversing the direction of the sprinkler head. Inner housing 167 is supported on conventional O-ring 172 and is sealed to the outer housing through the sleeve 173 which bears upon the upper wall of the inner housing when the outer housing cover 164 is threadedly engaged on the outer housing sidewall 163. An integral arcuate disposed above upper wall 170 of inner housing 167.

Spririkler head is in all respects identical to sprinkler head 50 described in detail in reference to the first exemplary embodiment of the sprinkler device. Sprinkler head 180 is supported by means for rotatably mounting the sprinkler head which in this exemplary embodiment comprises the shaft 181 having a reduced diameter portion 182 journalled in top wall 170 and bottom Wall-168 of inner housing 167. Shaft 181 is prevented from vertical displacement through retainer ring 183 on reduced diameter shaft 182 positioned below bottom wall 168 of inner housing 167.

In the present embodiment, fluid impact motor means is of the type wherein a ball or sphere 191 is driven in an upward spiral path by the water flow within the housing. The impact ball 191 will thereby drive the sprinkler head 180 vertically upwardly so as to effect the pop-up. As seen in FIG. 11, the lower edge of sprinkler head 180 is provided with a downwardly depending lug 192. Consequently, when impact ball 191 is driven upwardly against the bottom of sprinkler head 180 and is rotated by the force of the water flow, contact of the ball with the lug 192 will cause rotation of sprinkler head 180. Each contact of the ball 19-1 with the lug 192 will rotationally advance the sprinkler head in small arcuate increments.

The second embodiment of the sprinkler device also includes means 200 for reversing the direction of rotation of the sprinkler head 180. In this exemplary embodiment, such means is disposed within the inner housing 167 and comprises Water-flow directing means generally indicated at 201. Means 201, in this specific embodiment, may comprise a water-directing turret 202 journalled in the bottom wall 168 and top wall 170 of inner housing 167. Turret 202 may comprise a cylinder 203 having an inlet opening 204 and a longitudinally extending water discharge slot 205 in the upper end of the cylinder which is disposed above upper wall 170 of inner housing 167.

The lower end of cylinder 203 includes a first arm 206, as seen best in FIG. 12, having a bifurcated end portion for receiving a pin 207 supported on the free end of a second arm 208 pivotally mounted on the side opposite the center axis of the sprinkler device through a pivot pin 209.

Pin 207 therefore interconnects first arm 206 and second arm 208. A third arm 210 is pivotally supported on reduced diameter shaft 182 through a retainer ring 211 and carries an actuating pin 212 on the free end thereof. Actuating pin 212 and pin 207 are interconnected through a flat, bent spring 213 constantly urging these pins toward one another.

The second embodiment of the sprinkler device also includes means for adjusting the arc of rotation of the sprinkler head and in this embodiment comprises circular plate 214 having a plurality of circumferentially spaced threaded openings 215 for receiving stop limit screws 216 and 217. Circular plate 214 is secured to reduced diameter shaft 182 through lock screw 218. It will be readily apparent that adjustment of the sprinkler head are oscillation may be performed in the second embodiment of the sprinkler device only internally.

Operation of the second embodiment of a sprinkler device constructed in accordance with the present invention is in all respects similar to the operation above-described of the first exemplary embodiment. Of course, the fluid motor means operable by water admitted through the housing inlet for rotating the sprinkler head is different in the second embodiment, and operates by impact as previosuly described. The are of part-cycle rotation is adjusted prior to operation by the removal of the cover 164 and the upper wall 170 of inner housing 167 so as to expose the means 200 for reversing the direction of rotation of the sprinkler head. Such adjustment is effected by positioning stop limit screws 216, 217 in the threaded openings 215 of circular plate 214, as seen best in FIG. 12. Reversal of direction, during operation, of sprinkler head 180 occurs in the manner described for the first exemplary embodiment.

It will therefore be seen that the sprinkler device of the present invention provides water discharge over an arcuate sector which may be adjusted. Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

I claim:

1. In a sprinkler device including a housing having a water inlet and a sprinkler head having a water outlet in fluid communication with the housing inlet, the head being axially movable relative to the housing, the provision of:

means rotatably and axially slidably mounting said sprinkler head;

fluid impact motor means operable by water admitted through the housing inlet for rotating said sprinkler head; and

means for reversing the direction of rotation of said fluid impact motor means including water flow directing means movably responsive to the arcuate position of said means for rotatably mounting said sprinkler head, independently of the axial position of said sprinkler head with respect to said housing.

2. The provision of claim 1 wherein said water flow directing means includes at least one water directing turret comprising a cylindrical body having a water inlet opening at one end and rotatably mounted with respect to said housing and a discharge opening for directing water against said fluid impact motor means so as to selectively rotate said fluid impact motor means clockwise or counterclockwise.

3. The provision of claim 1 wherein said fluid impact motor means comprises a water turbine including at least two turbine blades, said water turbine interconnected with said means for rotatably mounting said sprinkler head by direct drive gear transmission means.

4. The provision of claim 1 wherein said fluid impact motor means comprises a depending lug on said sprinkler head and an impact ball carried spirally upwardly by the water so as to strike said depending lug thereby rotating said sprinkler head in response to the rotational direction of the water discharge from said water flow directing means.

5. The provision of claim 1 additionally comprising means for externally adjusting the arcuate movement of said means for rotatably mounting said sprinkler head so as to vary the arc of rotation of said sprinkler head between reversals thereof while said sprinkler device is in operation.

6. The provision of claim 5 wherein said means for adjusting the arcuate movement of said means for rotatably mounting said sprinkler head comprises; gear means rotatably mounted on said means for rotatably supporting said sprinkler head and carrying an actuating pin, pinion drive gear means carried by said sprinkler head and axially slidably disposed in said means for rotatably mounting said sprinkler head and engaging said gear means, means for rotating said drive gear externally from said housing, whereby said actuating pin supported by said gear means may be selectively arcuately positioned to control the arc of rotation of said sprinkler head.

7. The provision of claim 5 wherein said sprinkler head includes means for arcuately adjusting said sprinkler head relative to said means for rotatably mounting said head.

8. The provision of claim 7 wherein said water flow directing means comprises at least one turret mounted on substantially opposed sides of said fluid impact motor means, each of said turrets comprising a cylindrical body having an inlet opening at its lower end and a discharge opening, each of said turrets being rotatably mounted with respect to said housing, each of said turrets having a gear sector mounted thereon, one of said turrets being interconnected with said means for reversing the direction of rotation of said mot-or means, and a gear pivotally mounted and engaging said turret gear sectors so that rotation of one of said turrets elrects rotation of the other.

9. In a sprinkler device including a housing having a water inlet and a sprinkler head having a water outlet in fluid communication with the housing inlet, the provision of:

means rotatably mounting said sprinkler head;

fluid impact motor means operable by water admitted through the housing inlet for rotating said sprinkler head;

means for reversing the direction of rotation of said fluid impact motor means including water flow directing means movably responsive to the arcuate position of said means for rotatably mounting said sprinkler head;

means for externally adjusting the arcuate movement of said means for rotatably mounting said sprinkler head so as to vary the arc of rotation of said sprinkler head between reversals thereof while said sprinkler device is in operation; and

means for arcuately adjusting said sprinkler head rela- 3,127,110 3/ 1964 Reynolds 239-206 tive to said means for rotatably mounting said head, 3,268,173 8/ 1966' Costa 239-206 whereby said are of rotation may be selectively posi- 3,383,047 5/1968 Hauser 239-206 tioned with respect to said housing. 3,463,401 8/ 1969 Cobigo 239-206 X References Cited 5 LLOYD L. KING, Primary Examiner UNITED STATES PATENTS 1,864,892 6/1932 Coles et a1. 239-206 2,990,120 6/1961 Reynolds 239-206 -2 242 3,107,056 10/1963 Hunter 239-206 10

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