Abstract:
A toy including a movable model, components for generating and alternating a magnetic field in response to a direct current, a permanent magnet disposed in the generated magnetic field, and a component for transmitting movement of the permanent magnet in the generated magnetic field to the movable model.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a Magnetically Movable Model Toy. More particularly, it relates to a magnetically movable model toy utilizing the magnetic attraction of two magnets. 
     Magnetically movable model toys of the above mentioned general type are known in the art. Permanent magnets have been used in movable toys, however, the movement has been caused by the attraction of one permanent magnet to another. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide a magnetically movable model toy which avoids the disadvantages of the prior art. 
     More particularly, it is an object of the present invention to provide a magnetically movable model toy which utilizes only one permanent magnet. 
     In keeping with these objects, and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a magnetically movable model toy having a movable model, means for generating and alternating a magnetic field in response to a direct current, wherein a permanent magnet is disposed in the generated magnetic field and means are provided for transmitting the movement of the permanent magnet in the generated magnetic field to the movable model. 
     When the magnetically movable model toy is designed in accordance with the present invention, the permanent magnet vibrates and the vibrations are transmitted to the movable model via the transmitting means. 
     Still another feature of the present invention is that the means for transmitting movement of the permanent magnet in the generated magnetic field to the movable model includes a string having ends respectively connected to the permanent magnet and the movable model. 
     A further feature of the present invention is that the permanent magnet is small. 
     Yet another feature of the present invention is that the movable model is a fish, having a mouth, in which is attached the end of the string. 
     Another feature of the present invention is that a vessel is provided for containment of the fish. 
     Still another feature of the present invention is that the vessel is hemispherically shaped and has a depressed base portion. 
     Still yet another feature of the present invention is that the permanent magnet is disposed in the depressed base portion of the vessel. 
     Yet another feature of the present invention is that the vessel contains a liquid. 
     Another feature of the present invention is that the liquid the vessel contains, is water. 
     Still yet another feature of the present invention is that there is provided a coil, a former, and a housing having a center, the coil is formed around the former and disposed in the center of the housing below the depressed base portion of the vessel which is mounted on the housing. 
     Yet another feature of the present invention is that the former contains an iron core. 
     Still another feature of the present invention is that there is provided an open mouthed casing of magnetic material in which the central core is disposed. 
     Another feature of the present invention is that the open mouthed casing of magnetic material is cylindrically shaped and the central core is composed of iron. 
     Still another feature of the present invention is that the open mouthed casing of magnetic material has a base which extends to form a magnetic path from the central core below the former. 
     Yet still another feature of the present invention is that the central iron core as an upper end that is an axial pole and the cylindrically shapped open mouthed casing of magnetic material has a curved wall that is a peripheral pole. 
     Still yet another feature of the present invention is that the means for generating and alternating a magnetic field in response to a direct current is disposed in the housing. 
     Another feature of the present invention is that the means for generating and alternating a magnetic field in response to a direct current includes first and second pairs of NAND gates, first and second pairs of resistances, and first, second, third and fourth transistors, the first pair of NAND gates constitutes a multivibrator circuit having an output regulated by the second pair of NAND gates which supplies the output of the multivibrator circuit through the first and second pairs of resistances to the bases of the first, second, third and fourth transistors which are arranged in a balanced bridge circuit. 
     Yet still another feature of the present invention is that the means for generating and alternating a magnetic field in response to a direct current further includes a coil having ends that are respectively connected to the junction of the collector of the first transistor and the emitter of the second transistor and the junction of the collector of the third transistor and the emitter of the fourth transistor. 
     Still yet another feature of the present invention is that the means for generating and alternating a magnetic field in response to a direct current further includes a switch which connects the direct current across the common collector junction of the second and fourth transistors and the common emitter junction of the first and third transistors. 
     Another feature of the present invention is that one of the NAND gates of the second pair of NAND gates has an output that is high and causes the first and fourth transistors to be switched on through the first pair of resistances so that one of the coil ends becomes negative and the other end becomes positive. 
     Finally, still a further feature of the present invention is that the other one of the NAND gates of the second pair of NAND gates has an output that is high and causes the second and third transistors to be switched on through the second pair of resistances so that one of the coil ends becomes positive and the other end becomes negative. 
     The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a perspective view of the toy of the present invention; 
     FIG. 2 is a partially sectioned view of the toy shown in FIG. 1; and 
     FIG. 3 is a circuit diagram of the toy shown in FIG. 1. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIG. 1 which shows a model fish 10 floating in water 9 contained in a hemispherical vessel 8 mounted on a housing 7. The model fish 10 has a mouth 10a to which is attached a fine string 11 which is connected to a small permanent magnet 12 disposed in a depressed portion of the base of the vessel 8. The model fish 10 is, in this way, connected to the small permanent magnet 12. 
     As can be seen from FIG. 2, the housing 7 contains a direct current cell 5 and a circuit 6 which converts the direct current into alternating current. In the center of the housing 7, below the depressed portion of the vessel 8, is disposed a coil 1 wound around a former 2 which contains a central core 4 and lies within an open-mouthed cylinder of magnetic material 3. The open-mouthed cylinder of magnetic material 3 has a base which extends to form a magnetic path from the central core 4 below the former 2. The curved wall of the open-mouthed cylinder 3 forms a peripheral pole 3a of the electromagnetic assembly while the upper end of the central core 4 forms an axial pole 4a. 
     Direct current from the cell 5 is converted into alternating current by the circuit 6, shown in FIG. 3. The alternating current is supplied to a coil 1. NAND gates 1C 1  and 1C 2  constitute a multivibrator circuit and NAND gates 1C 3  and 1C 4  regulate the output of the multivibrator circuit and supply the output of the multivibrator circuit through input resistances to the bases of transistors TR 1  -TR 4  arranged in a balanced bridge circuit. The coil 1 is connected across terminals A and B which are connected respectively to the junctions of the collector of the transistor TR 1  and the emitter of the transistor TR 2  and the junction of the collector of the transistor TR 3  and the emitter of the transistor TR 4 . The direct current cell 5 is connected through a switch 5 across the common collector junction of the transistors TR 2  and TR 4  and the common emitter junction of the transistors TR 1  and TR 3 . 
     Circuit 6 operates as follows. When the output of NAND gate 1C 3  is high, the transistors TR 1  and TR 4  are switched on through input resistances R 3  and R 4  so that the terminal A becomes negative and the terminal B becomes positive. Alternatively, when the output of NAND gate 1C 4  is high, the transistors TR 2  and TR 3  are switched on through input resistances R 5  and R 6  so that the terminal A becomes positive and the terminal B negative. The change of polarity of the lines of magnetic force generated by the coil 1 changes the forces on the small permanent magnet 12 and causes it to vibrate. This vibration is transmitted through the fine string 11 to the model fish 10 floating in the water 9. 
     When iron is used for the open-mouthed magnetic cylinder 3 and for the central core 4, there is created a strong magnetic field. Therefore, there is provided a separation between the poles 3a and 4a and thus preventing the permanent magnet 12 from becoming attracted to either of the poles which would restrict or prevent its movement. 
     Due to the changes in the magnetic force, in accordance with the frequency of the alternating current, the model fish 10 connected to the permanent magnet 12 through the string 11 moves irregularly while floating in the water 9. This irregular movement simulates a live fish searching for bait and swimming about. When the permanent magnet 12 turns, the fine string 11 twists and thus shortens its length. This shortening, draws the model fish 10 down to the bottom of the vessel 8. When the resistance to the twisting of the fine string 11 overcomes the turning action of the permanent magnet 12, the fine string 11 unwinds and elongates. This elongation causes the model fish 10 to ascend abruptly in the water 9 as if to pick up bait. This very interesting and attractive movement resembles the movement of a live fish. 
     The use of a direct current cell rather than main current makes the toy fish safe and suitable as an ornament. 
     Diode D and resistor 7 are connected in parallel across the cell 5 and the switch S. Their junction provides a constant current power supply ICVDD for the integrated circuit NAND gates in the circuit 6. 
     It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of magnetically movable model toys differing from the types described above. 
     While the invention has been illustrated and described as embodied in a magnetically movable model toy, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention. 
     Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.