JPS6361031B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a rotary swing capable of manipulating a rotating disk having a rotating surface inclined with respect to the direction of gravity by the movement of a body positioned on the rotating surface. It relates to see-saws, can be used as play equipment or physical training equipment, and is useful for stimulating demand in the play equipment industry and the health equipment industry.

[Prior Art and Problems to be Solved] Generally, as play equipment, a spherical rotating body of an iron frame having a rotating surface horizontal to the direction of gravity is rotatably installed in an amusement park. Since this rotating body cannot be rotated solely by the physical movement of the player located inside, it is necessary to have a turning force applied to it from the outside, or to give a rotating movement to the rotating body in advance and jump on it. , and have come to enjoy the turning motion caused by inertia. However, since the rotation cannot be sustained with this method, rotational force must be added from time to time, which often causes players to get bored and lack interest as a play equipment. It was.

However, if the disk is supported on the main shaft on the back side of a tilted shaft bearing installed diagonally on the ground, as in the ``tilted disk spinning toy'' disclosed in Publication of Utility Model Publication No. 17548/1970, the person riding on it can It would be possible to create continuous rotation without power, provided that the gravitational imbalance can be skillfully manipulated. However, when trying to actually operate this vehicle, everyone on board
Because you have to lie face down on the disk and hold on to the handrail, you cannot see your surroundings as it rotates.
There was no visual enjoyment, and there were also safety issues.

The present invention was made in view of the above-mentioned problems with conventional non-powered rotating play equipment and physical training equipment, and the present invention has been developed in view of the above-mentioned problems with conventional non-powered rotating play equipment and physical training equipment. The technical challenge is to provide a rotary swing seesaw that allows for fun and safe increase and deceleration control.

[Means adopted to solve the problem]

The key point in solving the above technical problem of the present inventors is that when the rotary disk has a rotation axis inclined with respect to the direction of gravity, the player can move the center of gravity while stably seated on the rotary disk. The new finding is that if configured as such, changes in potential energy due to body movements will be efficiently converted into rotational kinetic energy.

That is, the present invention provides a rotary disk 1 whose upper surface forms a concave curved surface, and a ring frame 3 is disposed concentrically or spirally on the concave curved surface so that a player can be seated stably. , is rotatably supported around a pivot shaft 6 with an inclination angle α of π/2 or less with respect to the direction of gravity, and a player on the rotary disk 1 clings to the ring frame 3 and while sitting there, the center of gravity can be adjusted. By moving and moving forward and backward in the radial direction, the average turning radius of the player from the maximum potential energy angular position P (θ = 0) to the minimum potential energy angular position P (θ = π) is calculated as the minimum potential energy angular position P ( A rotary that satisfies the above-mentioned technical problem by employing a means of reducing the average turning radius from θ=π) to the maximum potential energy angular position P (θ=2π) so as to be able to turn continuously. This made swing seesaw a reality.

〔Example〕

Hereinafter, based on the illustrated embodiment, a more theoretical explanation will be given. As shown in FIG. Assume that P is a point on the rotating disk, and assume that the energy loss associated with the rotation of the rotating disk is only due to the frictional force of the bearings, etc.
Assuming that the frictional force is of a constant magnitude and acts at a constant distance from point O, when the rotary disk forms an inclination angle α with respect to the direction of gravity, the mass point P moves on a circular orbit of radius R. Assuming that it is turning clockwise,
The torque TR acting clockwise at any point P (R·θ) is equal to the value obtained by subtracting the frictional resistance torque Tf of the bearing etc. from the torque TR' due to gravity.

TR=TR′=Tf=WRcosα・sinθ−Tf... However, W is the weight of the mass point P.

Therefore, the kinetic energy VR of mass point P =
Based on ∫TRdθ, the formula VR=WRcosα(1−cosθ)−Tfθ... can be obtained.

On the other hand, the potential energy of the mass point P(R, θ) can be expressed as PR=WRcosα・cosθ...

Therefore, the energy of the mass point P can be expressed as E=PR+VR=WRcosα−Tfθ, and the energy gradually attenuates as it rotates.

Therefore, as is clear from the equation, the energy of 2πTf is attenuated by one rotation, so if such attenuation is compensated for by moving the radius of gyration of the mass point P, the rotary disk can be rotated continuously. .
To do this, if you move the mass point inward of the rotary disk as shown in Figure 5 at a position where the maximum potential energy is used (θ = π0, n is an odd number), the difference in turning radius can be accommodated. , the potential energy increases.≪If the turning radius is reduced from R to r, then Wcosα(R
−r) increases≫ and the above minimum potential energy angular position (θ=nπ, however,
n is an odd number) to the maximum potential energy angular position (θ
= nπ, n is an even number), and the amount of kinetic energy attenuation during the return turn is reduced by Wcosα(R−r) (the return turn radius of the mass point P is assumed to be r). Therefore, it is clear that continuous rotation is theoretically possible if the energy 2Wcosα(R-r) saved by reducing the turning radius compared to one rotation with the turning radius R is greater than the energy loss 2πTf due to friction. becomes.

Therefore, as shown by R-r>πTf/Wcosα..., the body turns from the maximum potential energy angular position to the minimum potential energy angular position while keeping the turning radius of the body center of gravity at R as much as possible, and the minimum potential energy is reached. Reduce the turning radius as much as possible from the angular position,
As long as the player returns to the maximum potential energy angular position and adjusts the configuration on the rotary board so that it is easy to expand the turning radius to R again, the player will advance and retreat with the center of gravity in the ideal condition. This allows efficient continuous rotational movement to be generated.
When stopping or damping the rotary disk, it is sufficient to stop the body movement or to actively perform the body movement opposite to the above-mentioned continuous rotation.Also, when multiple people stand on the rotary disk, each When a person performs the above-mentioned action, a predetermined rotation or stop action can be given accordingly.

As an embodiment of the present invention, as shown in FIG. As shown in FIG. 2, the rotary disk 1 may be arranged such that the rotating surface is inclined with respect to the direction of gravity, with a support base 11 made of an elastic material interposed therebetween. Then, if the rotary disk 1 is rotatably supported by a support made of an elastic material as shown in FIG.
Furthermore, since the vertical movement is added, the user can enjoy even more interesting movements, further increasing the playability.

[Effects of the present invention]

As explained theoretically using the examples above,
In the present invention, a rotary board 1 has a concave curved upper surface, and a ring frame 3 is disposed concentrically or spirally on the concave curved surface so that a player can be seated stably. Since a means of rotatably supporting the pivot shaft 6 with an inclination angle α of π/2 or less with respect to the direction of gravitational action is adopted, R-r = πTf/Wcosα depending on the inclination angle α. Based on the theoretical formula of Not only can it be sensed, but it also allows for accurate recognition of dangers during operation, making it extremely useful as play equipment and physical education equipment.

[Brief explanation of drawings]

Fig. 1 is a plan view of a rotary disk of a rotary swing seesaw according to a first embodiment of the present invention, and Fig. 2 is a plan view of a rotary disk of a rotary swing seesaw according to a first embodiment of the present invention.
A partially sectional front view of the embodiment, FIG. 3 is an explanatory diagram for analyzing the rotational motion of the rotary disk, and FIG. 4 is a schematic diagram showing ideal body motion on the rotary disk. 1... Rotating disk, 2... Rotating shaft, 3... Ring frame, 6... Pivot.

Claims (1)

[Claims] 1. A rotary board 1 whose upper surface forms a concave curved surface, and a ring frame 3 is disposed concentrically or spirally on the concave curved surface so that a player can be seated stably. is rotatably supported around a pivot shaft 6 at an inclination angle α of π/2 or less with respect to the direction of gravity, and the player on the rotary disk 1 supports the ring frame 3.
The player moves from the maximum potential energy angular position P (θ = 0) to the minimum potential energy angular position P (θ = π) by moving the position of the center of gravity and moving forward and backward in the radial direction while clinging to the position and sitting there. The average turning radius is calculated from the minimum potential energy angular position P (θ=π) to the maximum potential energy angular position P
A rotary swing seesaw characterized by being configured to be able to make continuous turns by reducing the average turning radius to (θ=2π).