US2583123A - Fluid actuated toy motive device - Google Patents

Description

Jan. 22, 1952 A. ROWLEY EI'AL FLUID ACTUATED TOY MOTIVE DEVICE 2 SHEETS -Si-1EET 1 Filed Oct. 28, 1949 19/? THU/i ROM 1 f Y I flaw/c5 1:". JONES 16M ai;

Jan. 22, 1952 A. ROWLEY ETAL 2,583,123

FLUID ACTUATED TOY MOTIVE DEVICE Filed 001;. 28, 1949 2 SHEETS-SHEET 2 Patented Jan. 22, 1952 FLUID ACTUATED TOY MOTIVE DEVICE Arthur Rowley, Green Lake, Wis., and Bernice E. Jones, Oak Park, Ill.

Application October 28, 1949, Serial No. 124,012 11 Claims. (01. 46-41) This invention relates in general to a fluid actuated motive device whichis particularly designed for the movement and animation of toy to be attachedthereto.

Devices of this general nature heretofore have had the disadvantage of utilizing only a single toy or object to be animated, whereas the pres-- ent invention is susceptible to use in connection with various types of objects which may be applied thereto. One of the principal objects of the presen invention is to provide a novel form of fluid actuated motive device for the propulsion of animation of a plurality of different objects which may be applied thereto.

Another object of the invention is to provide" a fluid actuated motive device in the form of a,

toy and which consists in general of a reciprocating driving arm for animating or propelling various toy objects attached to the device.

A further object of the invention is to provide a fluid actuated toy motive device wherein the force of a flowable material is utilized for reciprocating a driving arm which propels or animates various types of toys attached to a swinging pendulum. .7 Still another object of the invention is to provide a fluid actuated toy motive device wherein toy objects may be propelled or animated at different speed rates by the use of a novel form of adjustment.

A still further object of the invention is to provide a fluid actuated toy motive device wherein power is obtained for animating various toy objects through the use of either a simple or compound linkage mechanism which is driven by the force of a flowable material. Still another and more specific object of the invention is to provide a fluid actuated toy motive device wherein the speed of propulsion or animation of a toy object may be increased or decreased, depending upon the specific object, by the use of various novel adjusting means applied to either a simple or compound linkage mechanism. '1 Other objects and advantages of the invention will become apparent upon reading the following description taken in conjunction with the accompanying drawings in which: Fig. 1 is a side view partly in section and" partly in elevation of one form of the invention illustrating the normal position of a toy object in full lines and the opposite extreme position thereof in dotted lines;

Fig. 2 is a front elevational view of the device shown in Fig. 1;

Fig. 3 is a side view partly in section and partly in elevation of a modified form of motive device illustrating the use of a simple linkage mechanism; and

Fig. 4 is a side view partly in section and partly in elevation of the device shown in Fig. 3 illustrating the particular toy object in its opposite extreme position.

The invention herein has reference to a toy motive device wherein different toy objects may be animated through the force exerted by the momentum of a flowable material on a linkage mechanism. While the flowable material used may be any substance capable of accomplishing the desired results, suchv material has been shown and will be referred to herein as sand. We do not wish to be limited to this specific material, however, since other flowable materials or fluids may serve the same purpose.

The flowable material is permitted to flow downwardly from a hopper onto a scoop or chute pivotally mounted on a supporting standard. A counter-balance for the scoop is provided, the weight of which must be overcome by the sand on the scoop before the initial movement of the object may take place. The scoop is then caused to move downwardly due to the weight of the sand thereon, and when it reaches a predetermined lowered position, some, but not all, of the sand in the scoop will be discharged therefrom until the weight of the sandyin the scoop is overcome by the counter-balance. At this point the counter-balance will urge the scoop upwardly to receive an additional quantity of sand. It is important that the scoop be located beneath the sand hopper in such a way that the sand flows continuously thereagainst whether it is in the upper or lower position.

A series of links connect the oscillating scoop with a pendulum arrangement to which may be attached any one of a plurality of different types of toy objects. It may be desirable for some objects to be propelled or animated at a greater rate of speed than others. To accomplish this result various adjusting means have been incorporated into the device so that a greater or lesser amount of power may be acquired as well as a faster or slower rate of movement of the pendulum.

The drawings herein illustrate two extreme type of toy objects which require difierent animation rates. For example, Fig l shows a common lawn swing which shouldhave a relatively slow movement and swing through a relatively long are. Figs. 3 and 4, on the other hand, illustrate a clog dancer which should have a relatype of supportingmeans may be utilized such as v the supporting standard or frame 1 consisting of spaced side members 2 and 3. The bottoms of In the embodiment of the invention illustrated in Figs. 1 and 2, the toy object to be propelled or animated is a reproduction of a lawn swing and is indicated generally by the numeral 39. This object or figure has an arm 49 with a plurality of holes t! therein, whereby a screw 12 may be used to fasten the swing at various locations along the lengthlof'the pendulum arm Itwill be clear that the greater the distance the swing is from the fulcrum 3'5, the

greater will be the are through which it swings.

these members may be mounted on a plate for convenience and which may receive a suitable receptacle 5 to receive the sand discharged from the scoop. A hopper 6 is mounted at the top of the frame l and is adapted to contain a quantity of a flowable material such as sand 2'. The bottom of the hopper 6 is provided with'an opening 8 through which the sand or'other fiowable material I may flow downwardly and be received by a scoop 9. If desired, the hopper 6 may be provided with a plate so having an opening H therein adapted to be in alignment with the opening 8 in the bottom of the hopper 6. This plate iii may be mounted for eitherpivotal or sliding movement, whereby the size of the open ing in the bottom of the hopper may be adjusted to regulate the flow of sand therethrough;

The scoop Q'preferably consists of a bottom l2, spaced sides i3 and a back hi. The forward end of the scoop is left open so that the sand may be discharged therefrom in its lower position." The rear end of the scoop has an extension !5 thereon which is bent upwardly as at it and again downwardly as at 1?. This extension then terminates in an elongated downwardly extending portion 58 which supports at the outer "end thereof a counter-balancing weight iii. If desired, this weight is may be mounted on a separate 'member and secured to the portion i8 by means of ascrew 2!. Each of the members '48 and 29 have a plurality'ofholes therethrough, whereby the weight 48 may be moved upwardly nearer the center of gravity or downwardly away from the center or gravity. The exact location of this counter-balancing weight it) wiil depend to some extent uponthe particular type of toy object being animated. A pair of cars 22 extend downwardly at a suitable location intermediate the scoop 9 and counter-balance l9. These ears have a pivot pin or rod 23 passingtherethrough which rod is supported adjacent each end thereof by "spaced arms 2 secured to the supporting standard.

A link 25 extends upwardly from one side of the portion i7 and has pivotal connection as at '26 with another link 2'! which maybe termed the driving arm. The outer end of the driving arm 21 is pivotally connected as at 28 to an upwardly extending link 29. This link 29 has a fulcrum point 30 about which it oscillates. This fulcrum point is'provided by a pin or rod mounted on a supporting member 31 secured to an outwardly extending arm 32 mounted on the main frame.

The upper end of link 29 has pivotal connection as at 33 to another link 34 which extends in a forward direction and is pivotally secured at its outer end as at 35 to the pendulum arm-35. This pendulum arm 36 also has a fulcrum point '3? provided by a pin secured to the member 38 also mountedon the elongated supporting arm 32. I

The swingiifi requires a relatively slow swinging movement in a relatively large arc to have the motion thereof reproduced properly. Furthermore, the weight of the swing and the relatively great distance thereof from the fulcrum 31 produces a considerable inertia and therefore requires "more power for propulsion. It is this type of toy object that requires preferably the compound linkage mechanism just described.

The driving arm :21 is caused to reciprocate in-a 'arm 2'! is transmitted and multiplied through the'links 29, 34 and 36.

Thus, sufiicient power is developed to start the swing in motion and cause a continuation of this motion in a rhythmic manner until the sand or other flowable material is exhausted from the hopper.

The various parts are shown in Fig. l in full lines in their normal unactuated positions. Sand isthen allowed to drop from the hopper 5 into the scoop 9. Sand will continue to accumulate in the scoop until the weight of the counterbalance i9 is overcome, at which time the scoop 9 begins to movedownwardly about the pivot 23. This'movement is atfirst relatively slow. As the sand continues to accumulate and the weight continues to increase, the scoop 9 will continue to'move downwardly until it reaches substantially the dotted line position shown in Fig. l, at which time they sand begins to-be discharged from the scoop 9 into the receptacle 5. Only a portion of the accumulated sand in the scoop 9 will be discharged therefrom in the lower position thereof and this discharging action is such as to remove the sand from the scoop at a greater rate than the sand is being added thereto from the hopper. In this lower position or the scoopth'e counter-balancing weight I9 has moved upwardly and as soon as a portion of the sand has been discharged from'the scoop, this weight will act to move the scoop back to its upper position where it continues to receive more sand. The operahopper is exhausted.

It should benoted and emphasized that the sand from the'hopper is delivered into the scoop at all'po'sitions of the scoop. If this were not true, there would be a tendency for the scoop to pause momentarily in its upper position until sufficient sand had again accumulated to overcome' the weight of the counter-balance. This flow of sand and the position of the scoop can be regulated with respect to each other so that no pause occurs at either the upper or lower limit 'of' movement of the scoop except that which is only necessary for a reversal of direction. The

'motion' therefore'is continuous and rhythmic andmust not be hampered by'any stop means at either end of the stroke.

The initial'angle of the scoop S with respect to the horizontal will determine to a great extent the amount of motive'power generated, as well as the length of arc and rate of speed of swinging of the reciprocating link 34.

crum points of the links 29 and 36.

movement of the pendulum 36. For example, if the scoop 9 is initially positioned so that the bottom thereof is at a relatively large angle with respect to the horizontal, it will be able to receive and hold a greater amount of sand before discharging. The reason for this is that the scoop must be lowered a greater distance before it would begin to discharge. swinging movement of the scoop will be through a larger arc and at a correspondingly slower rate of speed, but will still remain a continuous rhythmic motion. This type of motion is proper for the swing illustrated in Fig. 1. The angle of the scoop 9 with respect to the horizontal is preferably variable to enable the device to be used with other toy objects which require a faster movement through a shorter arc. The specific manner of making this scoop adjustable may be varied as desired. However, one form'of such adjusting means is shown in Fig. 1 wherein a screw threaded stud 43 is affixed to the back it of the scoop and extends at its other end through an opening in the upturned portion IS. The outer end of the stud has a wing nut 44 threadedly engaging it so that turning the wing nut may either raise or lower the scoop about the pin 45 as a pivot.

horizontal in its initial position because of the fact that less sand is allowed to accumulate on the scoop.

Provision is also made for varying other factors in the compound linkage mechanism such as the location of the fulcrum points 36 and 31 of the respective links 29 and 36. Thus it will be noted that additional holes 45-4| are located in the link 29 so that the fulcrum point of this link may be raised or lowered. This will change [the length of are through which the pivot 33 at the upper end of link 29 will move. This change will inherently affect the length of stroke I This length of stroke of the reciprocating link 34 may also be altered by changing the location of the pivots 33 and 35 at each end thereof nearer the ful- S uitable holes are provided in link 29 and pendulum arm 36 for this purpose.

The fulcrum 31 of the pendulum arm 36 may also be changed by moving it upwardly or downwardly in accordance with other openings in this ,arm. Thus it will be seen that the length of are through which the toy object will move may be varied by changing the fulcrum position and pivotal points of the various links as well as by raising or lowering the initial position of the scoop 9.

Themodified form of invention illustrated in :Figs. 3 and 4 may generate less power, but is satisfactory for use in connection with relatively light objects as well as those which are to bepro- In this situation the '6 the compound linkage mechanism shown in Fig. 1.

The parts of the devices in Figs. 3 and 4 which are similar to those parts in Figs. 1 and 2 bear similar reference numerals. The driving arm, however, in Figs. 3 and 4 is identified by the numeral 48 and is connected at one end to the pivot pin 26 of the link 25. The opposite end of the driving arm 48 is connected directly by means of a pivot pin 49 to any one of the plurality of openings 56 in the pendulum arm 5|. The upper end of pendulum 5| is pivotally connected at 52 to the outer end of the supporting arm 32. Thus, there is a direct driving connection between the link 25 andthe pendulum 5|.

The toy object to be animated in this case is illustrated as a clog dancer at 53. The type of movement required to reproduce properly the action of such a toy is a relatively short are and a fast movement. The toy clog dancer in this particular instance consists of a body 54 and legs 55 to whichthe feet 56 are pivotally connected as at 51. Behind the body there is a plate 58 which terminates in a bottom flange 59 having corrugations throughout the length thereof. Both the corrugated flanges 59 and feet 56 of the figure are formed preferably of metal or some similar material which will simulate the noise created by a clog dancer. The short fast oscillating movement of the figure will cause the feet to oscillate back and forth-over the corrugated flange 59 and thus create a simulated clog dancer.

One means of accomplishing the result of a faster movement through a shorter arc is to secure the dancing figure onto the pendulum 5| at a point nearer its fulcrum 52. An adjustment is also made in the scoop 9 by regulating the thumb screw 44 to lower the scoop so that the bottom I 2 thereof is more nearly horizontal or below the horizontal as illustrated in Fig. 3.

The arrangement of the scoop 9 and counterbalancing weight IS in the form of Figs. 3 and 4 may be identical'with the arrangement of these parts shown in Fig. 1. It has already been explained that when the scoop is lowered as in Fig. 3, it will retain a lesser amount of flowable material before beginning to discharge the material than if the scoop is elevated as in Fig. 1. Since the scoop moves downwardly under the weight of the sand and begins to discharge sooner, it will also return to its uppermost position quicker and thus move through a lesser arc than will the scoop shown in Fig. 1. Since the-arc through which the scoop moves is less and since the movement is still a continuous and rhythmic one, the

rate of speed of movement will be accelerated, which increased speed will be transmitted through link 25 and drivingarm 48 to the pendulum 5| on which the toy figure is mounted.

The object to be animated shown in Fig. 3 may be applied as well to the structure of Fig. 1, whereupon it may be attached to pendulum arm 36 nearer its fulcrum than the swing 39. The necessary adjustments in the linkage mechanism may also be made to shorten the arc of swing and the scoop 9 may be lowered as illustrated in Fig. 3. The net result will then be the same as the form of the invention shown in Fig. 3.

Likewise the swing 39 of Fig. 1 could be attached to the pendulum arm 5| in Fig. 3 with a similar result provided it is mounted on the pendulum arm a greater distance from the fulcrum 52 than is the dancing figure. Also the pivot pin 49 may be moved to the uppermost opening 50 to increase the arc of swing, Finally, the scoop 9 may be elevated to substantially the position thereof shown in Fig. 1, whereupon the rate of swinging movement will be reduced and the length of arc will be increased.

It has been found in practice, however, that heavier objects requiring a greater length of are such as the swing 39 need more power for propulsion and animation and for this, reason the compound linkage mechanism is desirable. It is to be understood that an infinite variety of toy .objects and figures can be attached to the pendulum arm of either form of the device, since the invention herein is directed primarily to the motive means for animating the toys, such motive means being fluid actuated. Furthermore, some object to be animated could also be substituted for the weight 19 and this object would then act as a counter-balancing means.

An important feature of the invention whereby the smooth rhythmic action is obtained continuously is the location of the counter-balance I9 with respect to the fulcrum 23. This counterbalance accounts for a considerable share of the motive power because it is attached in such a way as to be disposed angularly downwardly with respect to the fulcrum 23. It will be noted that when the scoop is being loaded it swings downwardly and inwardly toward the center of gravity. At the same time the counter-balancing weight swings upwardly and away from the center of gravity. This tends to maintain an equilibrium at all times. Furthermore, the weight being farther from the fulcrum 23 will have more power to elevate the scoop back to loading position. This location of the weight therefore increases the power, whereas if the weight were to be located in a horizontal plane through the fulcrum '23 when in its normal position, the swing would be upwardly and inwardly toward the center of gravity thus reducing the power.

The foregoing description illustrates the manner in which a fiowable material is utilized to create motive power for propelling or animating toy objects. The manner in which the various parts are arranged enables the objects to move continuously in a' reciprocatin swinging manner through an arc in a smooth and rhythmic fashion. Any stop or limiting means at either end of the stroke would prevent such a rhythmic movement. It will also be clear that novel means have been provided for adjusting and regulating 'the speed of movement and length of arc of the animated object. Finally, adjustments are also provided for regulating the amount of power ob tainable for the propulsion and animation of toy objects.

Changes may be made in the form, construction and arrangement of parts from those disclosed herein without in any way departing from the spirit of the invention or sacrificing any of the attendant advantages thereof, provided. however, that such changes fall within the scope of the claims appended hereto.

The invention is hereby claimed as follows:

1. A toy fluid actuated motive dev ce comprising a frame, a hopper having a discharge opening fromwhich fiowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, and driving means connected to said member and said pendulum arm to swing said arm and animate the object during oscillation of said member.

2. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which fiowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, a longitudinally reciprocating driving arm connected at one end to said member, and means connecting said driving arm with said pendulum arm to swine said pendulum arm and animate the object during oscillation of said member.

3. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which fiowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counter balancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, a longitudinally reciprocating driving arm connected to said member and connected directly to said pendulum arm to swing said pendulum arm and animate the object during oscillation of said member.

4. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which fiowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and ofi center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity ofsaid mem-- ber being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto,'a longitudinally reciprocating driving arm connected at one end to said member, and a compound linkage mechanism connecting said driving arm with said pendulum arm to swing said pendulum armand animate the object during oscillation of said mber- 5. Atoy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which flowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of materialcontinuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said: member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, means drivingly connecting said member with said pendulum arm, and means for varying the degrees of are through which the object swings.

6. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which flowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, means drivingly connecting said member with said pendulum arm, and means for varying the speed at which said pendulum arm swings.

7. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which flowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counter-balancing means on the opposite side of the pivotal point, the center of gravity of said member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, means drivingly connecting said member with said pendulum arm, and means for varying the motive power exerted by said member.

8. A toy fluid actuated motive device compris- 10': ing a frame, a hopper having a discharge opening from which flowable material is discharged continuously in a stream,a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being so located asto normally urge the scoop to said lateral position, whereb said stream of material acting on said scoop and said counterbalancin means will cooperate to cause, said member to oscillate in a continuous and-uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object at tached thereto, means drivingly connecting said memberwith said pendulum arm, and mean for adjusting the normal angl of said scoop with respect to the horizontal whereby to vary the rate of speed at which said pendulum arm swings.

9. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which flowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, a longitudinally reciprocating driving arm connected at one end to said member, and means for connecting said driving arm with said pendulum arm at a plurality of difierent distances from the fulcrum of said pendulum arm, whereby to swing said pendulum arm through varying degrees of are.

10. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which flowable material is discharged continuously in a stream, a member pivotally mounted on said frame below and ofi center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being so located as to normally urge the scoop to said lateral position, whereby said stream of material acting on said scoop and said counterbalancing means will cooperate to cause said member to oscillate in a continuous and uninterrupted rhythmic motion, a pendulum arm mounted for swinging movement and adapted to have a toy object attached thereto, a longitudinally reciprocating driving arm connected at one end to said member, a link pivotally connected to said driving arm and pivotally mounted on said frame, and a sec- 11. A toy fluid actuated motive device comprising a frame, a hopper having a discharge opening from which flowable material is discharged con- 11 tinuously in a stream, a member pivotally mounted on said frame below and off center of the hopper, said member comprising a scoop extending laterally of the pivotal point and below the opening to receive the stream of material continuously, said member also including counterbalancing means on the opposite side of the pivotal point, the center of gravity of said member being 0nd link connecting said first link with said pendulum arm, whereby oscillation of said member will swing said pendulum arm, and means for changing the location of the pivotal points on said first link and on said pendulum arm, thereby to vary the degrees of are through which said pendulum arm swings.

ARTHUR ROWLEY.

BERNICE E. JONES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,151,919 Bain Aug. 31, 1915 1,429,684 Muldner Sept. 19, 1922 1,935,543 Coughlin Nov. 14, 1933

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