US1189942A - Seesaw. - Google Patents

Description

E. HARDY.

SEESAW.

APPLICATION FILED sEPT.-23. 1915.

Patented July 4:, 1916.

3 SHEETSSHEET I.

A TTOR/VEYS WITNESSES.

E. HARDY.

SEESAW.

APPLICATION FILED sEPT.23. 191s.

Patented July 4, 1916.

INVENTOR [EM/Pa /7 /7/?fi) By J V ATTORNEYS 3 SHEETSSHEET 2 E. HARDY.

SEESAW.

APPLICATION FILED SEPT.23, 1915. 1,189,942.

PatentedJuly 4, 1916.

3 SHEETSSHEET 3.

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,4 TTORIVEYS UNITED STATES PATENT orrron.

EDWARD HARDY, OF CANTON, MISSOURI.

SEESAW.

Application filed September 23, 1915.

To all whom it may concern:

Be it known that I, EDWARD HARDY, a citizen of the United States, and a resident of Canton, in the county of Lewis and State of Missouri, have inventedpertain new and useful Improvements in Seesaws, of which the following is a specification.

My invention relates to improvements in amusement and recreation devices, and more particularly tosee saws, one object being to provide a see saw which can be readily operated by children.

A further object is to produce a see saw that may be loaded at the ground, elevated and caused to oscillate from the seats of the see saw. g

\Vith these and other objects in view, my invention consists in certain novel features of construct-ion, arrangement and combination of parts as will be hereinafter described and pointed out in the claims, reference being had to the drawings, in which Figure 1 is asectional elevation of the device; Fi 2 is a top plan view; Fig. 3 is a side elevation, partly in section, of a portion of the upper part of the device; Fig. 4 is a vertical section on line 44 of Fig. 1; Fig. 5 is a transverse vertical section on line 55 of Fig. 1; Fig. 6 is a perspective view of the clutch lever for swinging the teeter frame.-

Referring more particularly to Fig. 1 of the drawing, A represents standards or uprights, which may be removably mounted in a concrete or other suitable base B. There are two sets of standards, spaced apart and parallelas shown in Fig. 2, the sets being connected at their tops by the cross bar C. A bearing block D is mounted to slide up and down on the standards at each side, and journaled in the upper ends of said blocks are the ends of a shaft E having mounted near its ends but inside the standards, the cog wheels F, said wheels being keyed to said shaft E. Adjacent to the cog wheels-F and loosely hung on the shaft E are the swinging arms G having each a hook G at its upper end and an extension G below the shaft E terminating in a balance weight G At about the center of the shaft E is mounted a clutch lever consisting of a handle rod H, loosely journaled at H on the shaft E and provided with a spring actuated boltH passing through an angular bracket Specification of Letters Patent.

Patented July 4, 1916.

Serial No. 52,171.

H and controlled by a bell crank lever H pivoted to the lower or handle end of the lever. This bolt is adapted to engage the notches of a downwardly projecting segmental rack I which is hung on the shaft E at I and rigidly keyed to said shaft. EX- tending in opposite directions from the lever H and longitudinally of the entire device are the arms J having eyes at their ends to which are attached the ends of ropes or rods K, said ropes or rods extending outwardly in opposite directions and crossing at about the center of the device. These ropes are supported by a short rope K suspended from horizontal bar near the seat so that the rope cannot drop to the ground. These ropes or rods are of such length as to eX- tend to the seats L which are pivotally suspended by rods L from the outer ends of a see saw or teeter frame comprising horizontal side bars M and cross bars M. At the central portion of these side bars and to the under face of the same are secured the racks N which rest on the cog wheels F, :constituting a movable fulcrum by means of which the center of gravity of the see saw may be changed.

To prevent the racks from passing entirely off the cog wheels F, there are proivided near each end the downwardly projecting stops N. From the ends of one of the racks thearms l 2 project upwardly, each having an eye n at its free end; in each eye is secured one end of a rod 0, the other end of said rod being attached to one end of a coil spring 0, the opposite end of which is attached to the upper end of vertically disposed bar 0 a pair of which proj ect upwardly from the sliding block D. Secured to the cross bars M at about the center are bearings P to receive a shaft Q, having at one end and adjacent one of the seats the hand wheel Q. The opposite end of the shaft Q, carries a sprocket wheel Qf on which runs the sprocket drive chain R which in turn drives the larger sprocket wheel S mounted on shaft S mounted in bearings secured to the outside beam of the teeter frame.

On shaft S is the worm S meshing with the worm wheels S on shaft S mounted in bearings at each end of the see saw frame. As shown in Figs. 1, 2 and 5, this shaft S serves as a Windlass upon which are wound the cables T which passing over the pulleys T suspended from the cross bar C near each side of the device, are fastened to the side beams of the teeter frame at T as clearly shown in Figs. 1 and 2.

It will be noticed that the cables T are arranged in a set and spaced apart from each other on the shaft S and that the cables are extended to opposite sides of the teeter frame, so that upon winding said cables on the Windlass shaft S the see saw or teeter frame will be lifted evenly and smoothly without bending at any point, and that by unwinding the cables the frame M may be again lowered to a point where the seats or cars may be conveniently unloaded, or loaded as the case may be, the said seats during their operations resting on the ground. The oliice of the springs O is to check the momentum of the see saw frame and also to serve as a buffer.

The operation of the device is as follows: Assuming the frame M to be in the position indicated in dotted lines, Fig. 1, the seats L are loaded with the passengers. From the right hand seat the hand wheel is manipulated and through the medium of the gearing between said hand wheel and the vindlass shaft S the cables I are wound on said shaft and the frame M is elevated by virtue of the blocks D sliding upwardly on the standards or uprights A until the noses of the hooks G contact with cross bar G when they are pushed to one side and then drop back upon the bar C, the weights C swinging and holding them in place. The rope K at the right hand side is now pulled by means of hand hold 70, whereupon the shaft E will be turned to the left and with it the cog wheels F which, meshing with the racks N on the under face of the side beams of the see saw frame, cause the frame M to travel toward the left by virtue of the center of gravity of the frame being shifted, the left end of the frame will overbalance the right and commence to descend. This descent will be gradual and smooth, due to the influence of coil springs O, and these springs also tend to prevent the end of the frame oscillating too far. The rope K at the left side of the device is now pulled, it being pulled to the left'. This turns the shaft E to the right, and with it the cog wheels F. This restores the frame to its normal position at first, and continued pull causes the frame to travel to the left beyond the normal center of gravity and the right end of the see saw descends. These operations are continued as long as desired, during which time the see saw or teeter frame will be continuously oscillated.

Another particular function of the segmental rack I and the loosely swung lever H is to get a perfect balance after seats are loaded. At the beginning of the ascent it can be determined in which direction the horizontal arms must be shifted and after being put in perfect balance by lever H the lever can be put back in its proper position which is perpendicular. .Vhen it is desired to disembark, an occupant from one seat pulls rope K to release hooks G, while at the same time the occupant of the other seat turns wheel Q, enough to allow releasing of the hooks G from the cross bar (1.

The seats or cars will always be main tained in proper position because of being swung by the links or bars L. It will thus be seen that I provide a simple yet effective see saw device, one which can readily be set up and taken down and one which is easily operable by children as well as by others.

I claim:

1. A see saw device, consisting of a horizontally disposed oscillatory frame, central supporting means for the same, means carried by the frame for elevating the same, on the supporting means, and means carried by the frame for causing oscillation of the frame when elevated.

2. A see saw device consisting of a horizontally disposed oscillatory frame, parallel uprights at opposite sides of the frame, blocks slidably mounted on said upri hts, a shaft connecting said blocks and rotatably mounted therein, cog wheels mounted on said shaft, rack bars on the under side of the frame and meshing with the aforesaid cog wheels, and means for causing reciprocal oscillation of the cog wheels whereby such oscillation will cause longitudinal movement of the frame to opposite sides of its normal center of gravity.

3. A see saw device consisting of parallel side uprights, a cross bar at the top thereof, bearing blocks slidably mounted on said supports, a shaft rotatably mounted in said bearing blocks, cog wheels rigidly secured to said shaft, an oscillating teeter frame having rack bars on its under side meshing with and supported on the cog wheels, swinging hooks mounted on the aforesaid shaft and adapted to engage the top cross bar of the uprights and hold the teeter frame in elevated position, and means for causing oscillation of the cog wheels to impart reciprocal horizontal movement of the teeter frame to opposite sides of its center of gravity.

l. In a see saw device, the combination. with uprights carrying vertically slidable cog wheels, and means for reciprocally rotating the same, of an oscillatory teeter frame having rack bars engaging said cog wheels.

5. In a see saw device, the combination with vertical side uprights, a cross bar connecting the same at the top, bearing blocks slidably mounted with respect to said uprights, a shaft revolubly mounted in said blocks and connecting the same, cog wheels rigidly mounted on said shafts, an arm extending from said shaft, pulling means secured to said arm, a teeter frame having rack bars at its sides resting on the cog wheels, swinging hooks carried by the aforesaid shaft and adapted to engage the top cross bar, and windlass mechanism carried by the frame and engaging with the cross bar to raise and lower the frame and the slidable blocks.

(3. In a see saw device, the combination with a horizontally disposed oscillatory teeter frame, parallel uprights at opposite sides of the frame, blocks slidably mounted on said uprights, means carried by said blocks for supporting the frame at its center, and resilient cushioning means interposed between the oscillatory frame and the bearing blocks.

7. In a see saw device, the combination with said uprights, vertically slidable bearing blocks mounted thereon, a shaft connecting said blocks, segmental cogs rigidly mounted on the shaft adjacent the uprights, a two-part clutch lever suspended from said shaft, arms projecting horizontally from said lever in opposite directions, an oscillatory teeter frame, having rack bars on its under side engaging and resting on the aforesaid cog segments, seats or cars pivotally suspended from opposite ends of the oscillatory frame, and pulling means attached to the projecting arms of the lever in opposite directions and extending to adjacent the aforesaid seats or cars.

8. A see saw device consisting of a pair of spaced apart uprights and a cross bar connecting the same at their upper ends, bearing blocks mounted to slide vertically on said uprights, a shaft journaled in said blocks, cogged members rigidly mounted on said shaft, a two-part clutch lever suspended from said shaft, arms projecting in opposite directions from said clutch lever, cords or rods secured to the ends of said arms and crossing each other extending in opposite directions, a teeter frame comprising side and cross beams and seats swingingly suspended from opposite ends, rack bars on the side beams of said frame and resting on the aforesaid cogged members, a Windlass mechanism carried by the teeter frame and guided by the top cross bar of the uprights, whereby the frame may be raised and lowered on the uprights, and resilient means interposed between the frame on the one hand and the slidable block on the other, and adapted to act as a cushion buffer when the frame is oscillated in one direction and as an auxiliary starting mechanism for the opposite oscillation.

EDWARD HARDY.

Gopie: of this patent may be obtained for five cents each, by addressing the Commissioner or new, Washington, D. C."

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