DE202023001498U1 - Throwing stick that detects its own revolutions in the air during a throw - Google Patents

Abstract

Toy that contains electronics, characterized in that it is rod-shaped.

Description

There are toys that are thrown in the shape of a throwing stick. These also rotate around their axes and can be used for juggling, for example. During fast rotations, the eye is no longer fast enough to determine the number of complete revolutions. The throwing stick considered here uses electronics to determine the number of revolutions, including fast revolutions, and outputs this acoustically directly on the throwing stick. The revolutions thrown are displayed visually directly on the throwing stick after catching.

There is currently visual and acoustic feedback on the market through transmission to a mobile phone. However, this involves a certain delay in the transmission. You also need to carry another device with you. The throwing stick considered here solves these problems and provides direct acoustic (7) and visual (8) feedback.

Thanks to the direct acoustic feedback (7), the thrower can now estimate the revolutions when throwing, thereby creating additional playing options.

• Der Wurfstab (9) wird in die Luft geworfen und dreht sich im Flug um seine beiden Hauptträgheitsachsen mit dem minimalem (3) und/oder maximalem Trägheitsmoment (4). Während der Drehung gibt das Gerät in bestimmten Winkeln (vorzugsweise alle 360 Grad) einer ausgewählten Achse ein akustisches Signal ab. Dies kann die Achse mit dem höchsten Trägheitsmoment (4) für Flippen oder die mit dem geringsten Trägheitsmoment (3) für Rollen sein. Eine Kombination aus beiden ist ebenfalls möglich.

An embodiment of the invention is based on 1 explains:

• The throwing stick (9) is thrown into the air and rotates in flight around its two main axes of inertia with the minimum (3) and/or maximum moment of inertia (4). During rotation, the device emits an acoustic signal at certain angles (preferably every 360 degrees) of a selected axis. This can be the axis with the highest moment of inertia (4) for flipping or the one with the lowest moment of inertia (3) for rolling. A combination of both is also possible.

Based on this feedback, the user can estimate how often the throwing stick has rotated around the respective axis. The acoustic feedback comes from the device itself.

The revolutions of a rod rotating in the air can be evaluated manually using video recording. There are playground equipment with a gyroscope that can measure the revolutions. During free fall, the acceleration due to gravity disappears in the center of the rotation axes and is recognized as a throw by the acceleration sensor integrated in the gyroscope. During this time, the gyroscope counts the angle change and the sum equals the revolutions. However, these gyroscopes can only record revolutions up to a certain angular speed. This means that fast revolutions cannot be analyzed. There are also products that use a second acceleration sensor instead of the gyroscope. This is arranged eccentrically and the number of revolutions can be determined using the acceleration value. The throw can also be detected through pattern recognition.

• Im Stab (9) befindet sich eine Platine (1) auf der zwei Beschleunigungssensoren (4 und 5) und ein Mikrocontroller (6) die Beschleunigungswerte ständig erfassen. Der Wurfstab hat zwei Rotationsachsen, auch Hauptträgheitsachsen (2) (3) genannt.

An exemplary embodiment of the invention is explained using Figures 1-3:

• In the rod (9) there is a circuit board (1) on which two acceleration sensors (4 and 5) and a microcontroller (6) constantly record the acceleration values. The throwing stick has two axes of rotation, also called the main axes of inertia (2) (3).

Due to the acceleration due to gravity, the acceleration sensors always measure an acceleration of 1g, which corresponds to approx. 9.81 m/s ² . If the rod is thrown, the acceleration due to gravity disappears at the acceleration sensor in the middle (5), which is located on the rotating things, because it is in free fall. This makes it possible to recognize when the stick is about to be thrown.

By placing the other acceleration sensor (4) eccentrically from the main axes of inertia, it measures the centrifugal forces generated by the rotations from both axes of rotation. An example measurement can be seen in Figure 2, where only one axis was rotated.

The throwing stick, in which the circuit board (1) is contained, is thrown into the air and rotates in flight around its two main axes of inertia with the minimum and/or maximum moment of inertia. A combination of both is always present and is also evaluated.

The acceleration values from the sensor in the middle (5) approach 0 during the throw. This is one of the indicators for the start of the revolution count. During this time, the acceleration value of the x and y axes is measured. $$\begin{array}{l}{a}_{ZentrifuGalx}={\omega }^2{r}_x={\omega }^2\text{d}x\\ a_{ZentrifuGaly}={\omega }^2{r}_y={\omega }^2\text{d}y\end{array}$$

The angular velocity can now be calculated using the known distance from the main axis of rotation. $$\begin{array}{l}{\omega }_x=\sqrt{\frac{a_{ZentrifuGalx}}{\text{d}x}}\\ {\omega }_y=\sqrt{\frac{a_{ZentrifuGaly}}{\text{d}y}}\end{array}$$

If this is integrated through several measurements over time, the throw angle is obtained. $$\begin{array}{l}{\phi }_x={\displaystyle {\int }_{t=0}^{t=wurfende}{\omega }_x\text{d}t}\\ {\phi }_y={\displaystyle {\int }_{t=0}^{t=wurfende}{\omega }_y\text{d}t}\end{array}$$

A revolution takes place every 2π or 360 degrees. During the throw, the microcontroller (6) (Figure 3) continuously calculates this formula and emits a tone with the loudspeaker (7) for every complete revolution. The stopping event is an increase in the acceleration of the sensor at the center, which corresponds to a catching of the throwing stick. The result of the integration provides the number of revolutions.

The number of revolutions achieved is then displayed visually directly on the rod using LEDs (8). An acoustic output with the loudspeaker (7) is also conceivable.

Reference symbol list

1

circuit board

2

Main axis of inertia with minimum moment of inertia

3

Main axis of inertia with maximum moment of inertia

4

Acceleration sensor eccentric to the axes of inertia

5

Acceleration sensor in the center of both axes of inertia

6

Microcontroller

7

speaker

8th

LED

9

throwing stick

10

Damping element

Claims (10)

Toy that contains electronics, characterized in that it is rod-shaped. Throwing stick according to one of the preceding claims, characterized in that the throwing stick is at least 1.5 cm, maximum 5 cm, preferably 3 cm thick. Throwing stick according to one of the preceding claims, characterized in that the throwing stick including the energy storage device weighs at least 50 g, a maximum of 180 g, preferably 90 g. Throwing stick according to one of the preceding claims, characterized in that the throwing stick is at least 10 cm, maximum 30 cm, preferably 21 cm long. Throwing stick according to one of the preceding claims, characterized in that the throwing stick contains damping elements (10) at the ends to mitigate shocks. Throwing stick according to one of the preceding claims, characterized in that it emits acoustic signals (7) during full or half revolutions around the main axis of inertia with maximum moment of inertia. Throwing stick according to one of the preceding claims, characterized in that it records the number of revolutions during the flight time by two acceleration sensors. One of the sensors is located as close as possible to the center of the two main axes of inertia. The second acceleration sensor is placed eccentrically from the main axis of inertia. The sensors send their signals to the microcontroller. Throwing stick according to one of the preceding claims, characterized in that it acoustically or visually specifies the number of revolutions for the next throw. Throwing stick according to one of the preceding claims; characterized in that it shows the number of revolutions made in the air after catching either visually or acoustically. Throwing stick according to one of the preceding claims, characterized in that it stores the number of revolutions in the throwing stick calculated with the microcontroller in a memory. The stored value can be called up directly on the throwing stick and reproduced visually or acoustically.

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