Abstract:
Problems are solved in a conventional traveling structure that can perform only the back and forth movement, circularly back and forth movement, and straight laterally movement, so that every directional movement is desired, and is not suitable for a traveling structure of agricultural equipment desired to be movable in every direction, and also is not enough of a challenge to be a traveling toy. In a traveling structure for traveling by rotating wheels with a driving source such as a motor, the traveling structure comprises a main body, the wheels arranged on every side of the main body, and auxiliary wheels arranged in the wheels rotatably in a direction perpendicular to the rotating direction of the wheels, wherein the auxiliary wheels are protruded from a supporting surface of the wheels.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    b  1 . Field of the Invention  
           [0002]    The present invention relates to traveling structures, and in particular relates to a traveling structure being suitable for use as a radio-controlled traveling toy, robot for searching planets, and cultivator, and being capable of traveling back and forth, straight laterally, and back and forth obliquely, and of revolving about one point.  
           [0003]    2. Description of the Related Art  
           [0004]    There have been conventional traveling structures of such a kind, such as a structure having a pair of caterpillars like a tank, which travels straight back and forth and circularly moves back and forth by driving the caterpillars with respective driving sources, or revolves about one point by driving one of the caterpillars, and a structure having four wheels like an automobile and traveling straight back and forth or circular moving back and forth by driving the one of back and forth wheels or by driving both the back and forth wheels with respective driving sources.  
           [0005]    Since such conventional traveling structures can only travel straight back and forth and circularly move back and forth, or revolve about one point, they tend to be dissatisfied as radio-controlled toys. Then, a traveling structure is recently available, which has caterpillars disposed on both sides and auxiliary wheels attached on the central back surface on either side to be able to rise. The traveling structure (traveling toy) advances by rotating both the caterpillars, revolves about one point by rotating only one caterpillar, and further laterally moves by raising and rotating the auxiliary wheels so as to cancel the grounding by the caterpillars.  
           [0006]    Such a traveling structure, however, can perform only the back and forth movement, circularly back and forth movement, and straight laterally movement, so that every directional movement is desired. For example, it is not suitable for a traveling structure of agricultural equipment desired to be movable in every direction, and also it is not enough of a challenge to be a traveling toy.  
         SUMMARY OF THE INVENTION  
         [0007]    A traveling structure according to the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a traveling structure capable of obliquely traveling as well as the back and forth moving, straight laterally moving, and revolving about one point.  
           [0008]    In accordance with a first aspect of the present invention, in a traveling structure for traveling by rotating wheels with a driving source such as a motor, the traveling structure comprises a main body, the wheels arranged on every side of the main body, and auxiliary wheels arranged in the wheels rotatably in a direction perpendicular to the rotating direction of the wheels, wherein the auxiliary wheels are protruded from a supporting surface of the wheels.  
           [0009]    In accordance with a second aspect of the present invention, in a traveling structure for traveling by rotating wheels with a driving source such as a motor, the traveling structure comprises a main body, the wheels arranged on every side of the main body, and auxiliary wheels arranged in the wheels rotatably in a direction perpendicular to the rotating direction of the wheels, wherein the auxiliary wheels are protruded from a supporting surface of the wheels, and wherein a suspension effect of absorbing unevenness on a traveling road is imparted to the wheels.  
           [0010]    Preferably, the wheels are attached to ends of legs extended from four sides of the main body; at least one pair of the legs comprise two legs; and the structure further comprises a drive member attached to an end of each of the legs, and a reducer gear train accommodated in the driving member, wherein the driving source is accommodated in the drive member, and wherein a driving force is transmitted to each of the wheels via the reducer gear train.  
           [0011]    Preferably, the structure further comprises a reducer gear train, wherein the driving source and the reducer gear train are accommodated in each of the legs and a driving force is transmitted to each of the wheels via the reducer gear train; and the drive member comprises a fixing member attached to each of the legs and a movable member rotatably attached to the fixing member, and the driving source and the reducer gear train are accommodated in the movable member while a suspension is interposed between the fixing member and the movable member.  
           [0012]    Preferably, each of the legs is longitudinally divided into two parts having a suspension interposed therebetween; and the auxiliary wheels accommodated in each of the wheels are arranged in a single column in a circumferential direction.  
           [0013]    Preferably, the auxiliary wheels accommodated in each of the wheels are arranged in a double column, in a staggered configuration, and in a circumferential direction; and the structure is a radio-controlled traveling toy.  
           [0014]    According to the present invention, as described above, in a traveling structure for traveling by rotating wheels with a driving source such as a motor, the traveling structure comprises a main body, the wheels arranged on every side of the main body, and auxiliary wheels arranged in the wheels rotatably in a direction perpendicular to the rotating direction of the wheels, wherein the auxiliary wheels are protruded from a supporting surface of the wheels, so that the structure is capable of back and forth, laterally, and obliquely traveling as well as of revolving about one point. Therefore, when being used for a toy, the structure becomes attractive for players by increasing a game fascinating range. When the structure is also used for a vehicle such as a cultivator, the auxiliary wheels securely bite into a soft road, facilitating farming operations, and furthermore, the vehicle can be moved laterally when being stopped, enabling the cultivator to be easily treated.  
           [0015]    By imparting the suspension effect to the wheels, the vehicle travels following even the unevenness on a road, so that it may not be stacked, while being able to securely travel in a desired direction because the wheels cannot float on an uneven road. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]    [0016]FIG. 1 is a perspective view of a traveling structure according to a first embodiment of the present invention;  
         [0017]    [0017]FIG. 2A is a rear elevational view, FIG. 2B is a side view, and FIG. 2C is a plan view of a drive member of the traveling structure;  
         [0018]    [0018]FIG. 3A is a rear elevational view, FIG. 3B is a side view, and FIG. 3C is a plan view of an internal mechanism of the traveling structure;  
         [0019]    [0019]FIG. 4 is an assembly view of a wheel;  
         [0020]    [0020]FIG. 5 is a perspective view of a second embodiment;  
         [0021]    [0021]FIG. 6 is a side view showing a drive member of the second embodiment in a state located on a flat road;  
         [0022]    [0022]FIG. 7 is a side view showing the drive member of the second embodiment when the road has projections;  
         [0023]    [0023]FIG. 8 is an assembly view of a wheel of the second embodiment;  
         [0024]    [0024]FIG. 9 is a perspective view of the wheel in an assembled state;  
         [0025]    [0025]FIG. 10 is a front view of the wheel in the assembled state;  
         [0026]    [0026]FIGS. 11A to  11 F are plan views of a third embodiment showing traveling states; and  
         [0027]    [0027]FIGS. 12A to  12 E are plan views of a fourth embodiment showing traveling states. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0028]    A teleoperated traveling structure according to an embodiment of the present invention will be described below with reference to the drawings.  
         [0029]    [0029]FIG. 1 is an overall view of a traveling structure A, and a body  1  is provided with a receiver for receiving radio waves from a transmitter and a battery or fuel for driving the receiver and a driving source such as a motor and engine, which will be described later, embedded therein. In addition, numeral  1   a  denotes an antenna connected to the receiver.  
         [0030]    Six legs  2  are formed integrally with the body  1 , and two legs  2  are formed in each of the back-and-forth directions of the body  1  and one leg  2  in each of the right and left thereof. Each leg  2  is provided with a drive member  3  attached at the end.  
         [0031]    The drive member  3 , as shown in FIGS. 2A to  2 C and FIGS. 3A to  3 C, comprises a fixing member  3   a  attached at the end of the leg  2 , an L-shaped movable member  3   b  journaled on bearings to the fixing member  3   a,  a spring  3   c  which is a suspension lying between projections  3   a   1  and  3   b   1  respectively protruded from sides of the fixing member  3   a  and the movable member  3   b,  a motor  3   d  built in the movable member  3   b , and a two-stage reducer gear train  3   e.  A wheel  4 , which will be described in detail with reference to FIG. 4, is rotatably journaled on bearings to the lower end of the movable member  3   b  to rotate by the driving power of the motor  3   d  via the reducer gear train  3   e.  The case of the motor as the driving source will be described below; however, an engine may of course be utilized instead of the motor.  
         [0032]    Next, the motor  3   d  and reducer gear train  3   e  will be described in detail. The motor  3   d  is embedded in the upper part of the movable member  3   b , and a bevel gear  3   e , of the reducer gear train  3   e , which is meshed with a gear (not shown) attached to a rotational shaft of the motor  3   d , is journaled on bearings to the movable member  3   b.  A gear  3   e   2  formed integrally with the bevel gear  3   e , is meshed with a spur gear  3   e   3  rotatably journaled on bearings to the same movable member  3   b.  A gear  3   e   4  formed integrally with the spur gear  3   e   3  is also meshed with a spur gear  4   a  attached to the wheel  4 .  
         [0033]    In the drive member  3  configured as described above, the driving of the motor  3   d  rotates the spur gear  4   a  via the reducer gear train  3   e , so that the wheel  4  is rotated. The rotational direction of the wheel  4  of course changes depending on the direction of the motor  3   d.    
         [0034]    Then, the wheel  4  will be described in detail with reference to FIG. 4.  
         [0035]    The wheel  4  comprises a pair of auxiliary-wheel carriers  41 , a plurality of auxiliary wheels  42  (eight in the drawing), and one axle shaft  43 .. The opposing surface of each auxiliary-wheel carrier  41  is provided with a plurality of grooves  41   a , into which the auxiliary wheels  42  are inserted, and bearings  41   b  for journaling shafts  42   a  of the auxiliary wheels  42  formed therein.  
         [0036]    A through-hole  41   c  is formed in the center of each auxiliary-wheel carrier  41 , and the axle shaft  43  is inserted into and stuck to the through-holes  41   c.  Although not shown, on one side of one of the auxiliary-wheel carriers  41  (the right auxiliary-wheel carrier  41  in FIG. 4), the spur gear  4   a  is fixed, which in turn is meshed with the gear  3   a   4  of the reducer gear train  3   e.    
         [0037]    In the wheel  4  configured as described above, when a rotational force is applied in the arrow directions in FIG. 4, the wheel  4  is movable in the rotational direction by the frictional force between the auxiliary wheels  42  and a supporting surface. On the other hand, when a moving force is applied in the direction parallel to the axle shaft  43 , the auxiliary wheels  42  become a state of idle running, so that the structure is smoothly movable in the direction perpendicular to the arrow directions.  
         [0038]    When there are depressions on a traveling way, the wheel  4  may be put into a state of not grounding. In this case, however, to the movable member  3   b , which is axially connected to the fixing member  3   a  with the spring  3   c  therebetween, a rotational force is applied by the spring  3   c  clockwise when viewing in FIG. 2B. Therefore, the wheel  4  is urged by the spring in the grounding direction so as not to float on the traveling way.  
         [0039]    Next, a second embodiment will be described with reference to FIGS.  5  to  11 F.  
         [0040]    According to the first embodiment described above, the drive member  3  having a buffer, which is the spring  3   c , and the wheel  4  attached thereto is attached to the end of the leg  2 ; alternatively, according to this embodiment, the leg is divided into a leg  21  and an auxiliary leg  22 , and a motor and reducer gear train (both not shown) are embedded into the auxiliary leg  22  while a spur gear (not shown) attached to a wheel  5  is meshed with the final stage of the reducer gear train.  
         [0041]    A surface of the leg  21  opposing the auxiliary leg  22  in the upper part is provided with a spring  23  as a suspension, with one end being supported to the leg  21  and the other end to a spring carrier  22   a  of the auxiliary leg  22 , which urges the auxiliary leg  22  by the spring force to rotate the auxiliary leg  22  clockwise. Furthermore, a projection  21   a  protruded from the leg  21  abuts the back surface of the auxiliary leg  22 , so that the auxiliary leg  22  usually maintains the horizontal state relative to the leg  21 .  
         [0042]    Therefore, while the auxiliary leg  22  maintains the horizontal state relative to the leg  21 , as shown in FIG. 6, when the traveling structure A travels on a flat way, when there are depressions on the traveling way, the auxiliary leg  22  is rotated counterclockwise against the spring force of the spring  23 , as shown in FIG. 7; however, when the way becomes flat, the auxiliary leg  22  returns to the horizontal state shown in FIG. 6 by the spring force of the spring  23 .  
         [0043]    Next, the wheel  5  will be described in detail with reference to FIGS.  8  to  10 .  
         [0044]    According to the first embodiment described above, the auxiliary wheels  42  are arranged in a single column, so that the traveling structure is liable to slip depending on conditions of the road surface because of small frictional resistance due to the small grounding area in the single column. Then, according to this embodiment, the auxiliary wheels  42  are arranged in a double column so as to increase the grounding area and prevent slippage relative to the road surface from being generated on any road surface.  
         [0045]    The wheel  5  comprises an auxiliary-wheel carrier  51 , a lateral pair of auxiliary wheels  52  and  53  rotatably journaled on bearings of both sides of the auxiliary-wheel carrier  51 , a pair of caps  54  and  55  for preventing the auxiliary wheels  52  and  53  from coming off the auxiliary-wheel carrier  51 , and an axle shaft  56  inserted into and fixed to holes  51   a ,  54   a , and  55   a  of the auxiliary-wheel carrier  51  and the caps  54  and  55 .  
         [0046]    The both sides of the auxiliary-wheel carrier  51  and the surfaces of the caps  54  and  55  opposing the auxiliary-wheel carrier  51  are provided with a plurality of grooves  51   b ,  54   b , and  55   b  (in the drawing, the number of wheels of each of the auxiliary wheels  52  and  53  is eight, so that there are eight grooves), into which the auxiliary wheels  52  and  53  are inserted. Also, the auxiliary-wheel carrier  51  is provided with bearings  51   c  formed for journaling shafts  52   a  and  53   a  of the auxiliary wheels  52  and  53  thereon.  
         [0047]    Although not shown, on the front surface of any one of the caps  54  and  55 , a spur gear to be meshed with the final gear of the reducer gear train accommodated in the auxiliary leg  22  is integrally formed. Also, the grooves and bearings to be inserted by the auxiliary wheels  52  and  53  are formed by displacing their positions so that the auxiliary wheels  52  and  53  are not abutted to each other.  
         [0048]    In the wheel  5  configured as described above, when a rotational force is applied in the arrow directions in FIGS. 8 and 9, the wheel  5  is movable in the rotational direction by the frictional force between the auxiliary wheels  52  and  53  and the supporting surface. On the other hand, when a moving force is applied in the direction parallel to the axle shaft  56 , the auxiliary wheels  52  and  53  become a state of idle running, so that the structure is smoothly movable in the direction perpendicular to the arrow directions.  
         [0049]    According to the second embodiment, there are provided the two auxiliary wheels  52  and  53 , so that the grounding area is increased, enabling the structure to securely travel even when the road is slippery. Furthermore, when there are projections on the traveling road, if one of the wheels  5  floats up, the other may also float from the grounding surface; however, in this case, the leg is divided into the leg  21  and the auxiliary leg  22  while the auxiliary leg  22  being urged by the spring in the grounding direction, so that only the wheel  5  running up onto the projection is independently rotated (see FIG. 7) so as not to affect the other wheel, so that the entire traveling structure A maintains the horizontal state, reducing the effect on the traveling.  
         [0050]    Next, the overall operation of the traveling structure A will be described with reference to the schematic views of FIGS. 11A to  11 F.  
         [0051]    Referring to FIGS. 11A to  11 F, the structure is exemplified with the auxiliary wheels  52  and  53  of the wheel  5  aligned to each other; the auxiliary wheels  52  and  53  may be positioned to align each other in such a manner, or they may be located by displacing their positions as in the second embodiment. Moreover, even in the case of one wheel as in the first embodiment, the operation, which will be described, is the same.  
         [0052]    The operation is now described below. In addition, in the drawings, to the wheels  5  patterned by hatching, driving forces are applied, and the arrow shows the proceeding direction of each of the wheels  5 . For convenience sake, numerals  5 ,  5 ′, and  5 ″ denote each pair of wheels.  
         [0053]    In the case of FIG. 11A, the pairs of wheels  5  and  5 ′ are driven in the opposite direction to each other as shown by the arrows, so that the structure is counterclockwise revolved about one point; in the case of FIG. 11B, the pairs of wheels  5 ,  5 ′, and  5 ″ are driven in the arrow directions, so that the structure proceeds diagonally upwards in the left; in the case of FIG. 11C, the pairs of wheels  5  and  5 ′ are driven in the arrow direction, so that the structure proceeds straight in the right; in the case of FIG. 11D, the pairs of wheels  5 ,  5 ′, and  5 ″ are driven in the arrow directions, so that the structure proceeds diagonally upwards in the right; in the case of FIG. 11E, the pairs of wheels  5  and  5 ′ are driven in the arrow direction, so that the structure proceeds straight in the left; and in the case of FIG. 11F, the pair of wheels  5 ″ are driven in the arrow direction, so that the structure proceeds straight upwards.  
         [0054]    Although not shown in FIGS. 11A to  11 F, in the case of FIG. 11A, by reversing the driving direction of the pairs of wheels  5  and  5 ′, the structure is clockwise revolved about one point; in the case of FIG. 11F, when the pair of wheels  5 ″ are driven in the direction opposite to the arrow, the structure proceeds straight downwards. Furthermore, in the case of FIG. 11B, when the pair of wheels  5  are not driven, the pair of wheels  5  are in a free state, so that the structure is clockwise revolved largely; in the case of FIG. 11D, when the pair of wheels  5 ′ are not driven, the pair of wheels  5 ′ are in a slippery state, so that the structure is counterclockwise revolved largely.  
         [0055]    As described above, in the traveling structure according to the present invention, there are provided the three pairs of wheels  5 , and each of the pairs of wheels  5 ,  51 , and  5 ″ is provided with the auxiliary wheels. The structure is rotatable in a free state in the direction perpendicular to the rotational directions of the pairs of wheels  5 ,  5 ′, and  5 ″, so that the structure is rotatable in every direction while being able to revolve about one point.  
         [0056]    Next, another embodiment shown in FIGS. 12A to  12 E will be described, wherein the wheels  4  disclosed in the first embodiment are arranged at four corners of the main body  1  with drive members therebetween, although which are not shown. According to this embodiment, to the wheels  4  patterned by hatching, driving forces are also applied, and the arrow shows the proceeding direction of each of the wheels  4 . For convenience sake, numerals  4  and  4 ′ denote each pair of wheels.  
         [0057]    In the case of FIG. 12A, the pairs of wheels  4  and  4 ′ are driven in the respective arrow directions, so that the structure proceeds straight upward; in the case of FIG. 12B, the pairs of wheels  4  and  4 ′ are driven in the different directions as shown by the arrows, so that the structure is counterclockwise revolved about one point; in the case of FIG. 12C, the pairs of wheels  4  and  4 ′ are driven in the respective arrow directions, so that the structure proceeds straight in the right; in the case of FIG. 12D, the pairs of wheels  4  and  4 ′ are driven in the directions opposite to the directions in the case of FIG. 12C, so that the structure proceeds straight in the left; and in the case of FIG. 12E, only the pair of wheels  4  are driven, so that the structure proceeds diagonally upwards in the left.  
         [0058]    Although not shown in FIGS. 12A to  12 E, in the case of FIG. 12A, by reversing the driving direction of the pairs of wheels  4  and  4 ′, the structure proceeds straight downwards; in the case of FIG. 12B, by reversing the driving direction of the pairs of wheels  4  and  4 ′, the structure is clockwise revolved about one point; and in the case of FIG. 12E, when only the pair of wheels  4  are driven, the structure proceeds diagonally upwards in the right.  
         [0059]    Also, according to this embodiment, in the same way as in the embodiment shown in FIGS. 11A to  11 F, each of the pairs of wheels  4  and  4 ′ is provided with the auxiliary wheels. The structure is rotatable in a free state in the direction perpendicular to the rotational direction of the pair of wheels  4 , so that the structure is rotatable in every direction while being able to revolve about one point.