JPH0421573Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a game board on which a game imitating tennis can be played.

B. Conventional technology Conventional game boards of this type include
As described in the publication, a cam plate with a cam groove that drives the racket twice for each revolution is attached to the main shaft rotated by a spiral spring, and the drive shaft of the racket is provided with a cam groove in the cam groove. A link is provided with a protrusion (i.e., a cam follower) that is slidably fitted into the racket, and the cam groove is provided with respective engagement steps with which the protrusion engages each time one drive of the racket is completed. A locking protrusion is provided near each of the engagement steps on the cam plate, and each time the protrusion engages with the engagement step, the locking protrusion abuts against the cam plate. A protrusion is provided on the drive shaft of the racket, and the link is attached to the drive shaft of the racket so that the protrusion that fits into the cam groove is brought into pressure contact with the engagement step every time the protrusion engages with the engagement step. Some have a structure in which a spring is suspended to bias and stop overrun.

C. Problems that the invention aims to solve In the conventional tennis game board mentioned above, from the time the mainspring spring is tightened until the small ball hits the racket, the cam plate is constantly subjected to a force that tries to turn it. However, the rotation of the cam plate is stopped by the protrusion that is pressed against the engagement step of the cam groove by the elastic force of the spring, and the racket is held in a state where it is ready to hit a small ball.

Therefore, if the elasticity of the spring is too weak compared to the force applied to the cam plate, when the racket hits a small ball and returns to its original position, the protrusion that has been sliding along the front half of the cam groove will engage. The racket is unable to stay in the position where it engages with the stepped part, and moves to the position where it overruns and starts sliding along the latter half of the cam groove, and the racket is continuously driven without stopping at the original position. If this happens, the racket may repeatedly miss swinging until the small ball returns.On the other hand, if the elasticity of the spring is too strong compared to the force applied to the cam, the racket may become If the action of hitting the ball becomes insensitive and the force when the small ball hits the racket is weak, the racket may remain stationary and the ball may not be hit.

In order to prevent such troubles and have the racket operate so that it hits the small ball smoothly only when the small ball hits the racket, it is necessary to adjust the elasticity of the spring mentioned above, but it is difficult to actually perform this adjustment. When you think about it, it's very delicate and often requires a lot of effort to adjust.

D. Means for solving the problems The present invention aims to provide a tennis game board that can solve the above problems.

The present invention will be explained in detail below based on the drawings. 1 is a base board, and 2 is a board surface imitating a tennis court.
and a guide rail portion 3 parallel to both edges of the board surface 2,
3' are provided with floor plates 4, 4'. 5,5'
are guided by the guide rail parts 3, 3' and the floor plate 4,
4' is a hollow racket support that moves back and forth between both ends of the racket, and a racket drive shaft 7 is rotatably installed between the forward and upward portions of both side walls 6, 6. However, at the center of each racket drive shaft 7, a racket support 5,
Support shafts 10, 10' are provided which protrude outward from the front portions of the racket supports 5, 5' through through holes 9 formed in the front wall 8 of the racket supports 5, 5'. , rackets 11, 11' are hung thereon. 12 is the main shaft, the racket support 5,
5', parallel to the racket drive shaft 7,
It is rotatably installed between the center portions of both side walls 6, 6 of the racket supports 5, 5'. 13 is main shaft 1
A cam plate attached to 2 is used to create a usage curve 15 that transmits the motion of hitting a small ball 14 formed of metal or the like to the rackets 11, 11', and a cam plate 15 that transmits the movement of hitting a small ball 14 formed of metal or the like to the rackets 11, 11'. A claw portion 16 is provided to stop the rotation of the cam plate 13 each time it returns to the starting position. 17 is a link that engages with the use curve 15 and transmits the movement of hitting the small ball 14 to the rackets 11, 11'; the upper end 18 is fixed to the racket drive shaft 7; A cam follower 19 is provided which engages the curve 15.
Reference numeral 20 designates a box that incorporates a spiral spring (not shown) suspended to transmit rotational power to the cam plate 13, and is provided integrally with the cam plate 13. 21 is a winding mechanism that connects to the spiral spring and tightens it; 22 is a stopper that stops the rackets 11, 11' from overrunning;
When the rackets 11, 11' move to the position immediately before starting to hit the small ball 14 on a pivot 24 rotatably connected to a support shaft 23 protruding inward from the bottom of one side wall 6 of the racket 5'. Then, the claw portion 16 of the cam plate 13
and engagement protrusions 27 and 28 that simultaneously engage with the lower end portion 25 of the link 17. A spring 29 is suspended so as to bias the stopper 22 to a position where the engaging protrusions 27 and 28 are brought into pressure contact with the claw portion 16 of the cam plate 13 and the lower end portion 25 of the link 17.

E. Function: First, the spring in the box 20 is wound up by the winding mechanism 21 for each racket support 5, 5'. In this process, the engagement protrusion 27 of the stopper 22 receives the elastic force of the spring 29 and the cam plate 1
3, and the rotation of the cam plate 13 is stopped, and at the same time, the engagement protrusion 28 of the stopper 22
is engaged with the lower end portion 25 of the link 17 under the force of the spring 29, and the racket 11, 11' is stopped at the position immediately before starting to hit the small ball 14. In this state, the cam follower 19 moves to a curved portion 15A of the usage curve 15 that transmits the motion of swinging down the rackets 11 and 11' as shown in the fourth figure.
In order to engage the rackets 11, 11' so that they can be moved back and forth, the rackets 11, 11' are grasped with fingertips and moved to the raised position, and then the rackets 11, 11'
When you release your fingertips, the rackets 11, 11' return to their original positions under their own weight.

Once the above spring is fully wound,
Either the racket support 5 or 5' on the board surface 2,
For example, the racket is rolled toward the edge where the racket support 5 is provided, and a tennis game is started.

A person operating the racket support 5 quickly moves the racket support 5 on the floorboard 4 toward a position where the racket 11 can receive the rolling small balls 14.

When the small ball 14 hits the racket 11, the lower end of the racket 11 is pushed in the direction of the arrow as shown in FIG.
This movement is transmitted to the link 17 via the support shaft 10 and the racket drive shaft 7, so the link 17 rotates to the starting position of the racket 11 with the racket drive shaft 7 as a fulcrum. Then, the cam follower 19 moves to the starting position of the curved part 15B of the usage curve 15 that transmits the motion of swinging up the rackets 11, 11', and at the same time the lower end 2 of the link 17
5 presses the engagement protrusion 28 against the elasticity of the spring 29, so that the engagement protrusion 27 uses the support shaft 23 as a fulcrum and is separated from the claw portion 16 of the cam plate 13 against the elasticity of the spring 29. The cam plate 13 receives the rotational power accumulated in the spiral spring and rotates in the direction of the arrow. Then,
The curved portion 15B of the usage curve 15 is the cam follower 1.
The link 17, the racket drive shaft 7, the support shaft 1
The movement of swinging it up is transmitted to the racket 11 via the racket 11, and the racket 11 hits the small ball 14 back toward the opposite edge where the racket support 5' is provided.

When the racket 11 is raised, the 10th
As shown in the figure, the position where the cam plate 13 engages with the next claw part 16 is reached, and the engagement protrusion 27 engages with the spring 29.
Since the cam plate 13 engages with the claw portion 16 under the force of the elastic force, the rotation of the cam plate 13 in the direction of the arrow is stopped. Then, the cam follower 19 moves to the curved part 15B of the usage curve 15.
Move to the curved part 15A connected to the curved part 1
5A, the racket 11 is swung down by its own weight, and at the same time, the movement is transferred to the link 1 via the spindle 10 and the racket drive shaft 7.
7, the link 17 rotates toward its original position using the racket drive shaft 7 as a fulcrum, and when the racket 11 descends to the position just before it starts hitting the small ball 14, the lower end 25 of the link 17 touches the stopper 22. The link 17 reaches its original position and stops, and the racket 11 is held in a standby state to hit the next rolling ball 14.

The person operating the racket support 5' quickly moves the racket support 5' on the floor plate 4' to a position where the racket 11' can receive the small balls 14 that are hit by the racket 11 and are rolling. let

When the small ball 14 hits the racket 11', the same action as described above for the racket 11 proceeds, and the racket 11' moves the small ball 14 towards the opposite edge where the racket support 5 is provided. Hit back.

In the above manner, both racket supports 5,
5' is moved alternately towards the rolling small ball 14, and the rackets 11 and 11' are used to hit the small ball 14, and if you miss hitting the small ball 14 during that time, you have missed the ball. The winner or loser of a match is determined by the points conceded by the person operating the racket support 5 or 5' on the other side, and the points scored by the opponent. By repeating the above operations, the game imitating tennis can be continued.

F. Example The base plate 1 has opposing long sides 30, 30' and short sides 31, 31' continuous to the ends thereof, and has a portion along the opposing long sides 30, 30' on its upper surface. The surrounding walls 32, 32' are provided, and each surrounding wall 32,
The board surface 2 is provided with slopes 33, 33 which have a top part along a line connecting the central part of the board 32' and slope down from there toward both edges of the board surface 2. A line 34 imitating the white line drawn on the court is attached, and recesses 35, 3 are provided between each edge of the board 2 and the short sides 31, 31'.
5', and the upper surface of each surrounding wall 32, 32' is provided with grooves 36, 36' for storing the small balls 14, and sliders 37, 37' for displaying the score. The grooves 36, 36' may be provided with an outlet for sending out the small balls 14 toward the top of the board 2.

The floor plates 4, 4' are arranged in the recesses 35, 35' so as to be in contact with the boundary with the board surface 2, and are fixed to the bottoms of the recesses 35, 35' with screws 38, 38'. , 4' have long holes 3 parallel to both edges of the board 2 in the center of the upper surface in the direction of both ends.
9, 39' are bored to form the guide rail parts 3, 3', and the upper surface of the floorboards 4, 4' is formed by drilling the elongated holes 39, 39'.
From 9', the part on the side of the board surface 2 is formed to have a step higher than the part on the opposite side, and in that step,
Rack gears 40 along the hole edges of the long grooves 39, 39';
40' is provided.

A through hole 41 is provided in the center of the upper surface of the floorboards 4, 4'.
pedestals 42, 42' are placed thereon and are moved back and forth between both ends of the floorboards 4, 4', respectively.
42' has a long hole 3 on the side of the through hole 41.
A frame 43 that protrudes from a portion facing the slots 39, 39' to fit into the slots 39, 39' and is open on both sides; are provided with protrusions 44, 44 that protrude so as to be slidably fitted into the protrusions 4, and these protrusions 4
A retaining plate 46 having a width larger than the width of the elongated holes 39 and 39' and provided with a notch 45 into which the lower end of the frame 43 fits is pressed between the ends of the screws 47 and 44. , 47 from both ends of the retaining plate 46 to the protrusions 44, 44, and attach the pedestals 42, 42'.
are engaged with each other so that they can smoothly reciprocate without coming off the floor plates 4, 4', and elongated holes 39 are provided in the upper surfaces of the pedestals 42, 42' near the front and rear edges. , 39' are provided with locking protrusions 48, 48 which protrude in parallel with the protrusions and have a cross section bent outward into a hook shape.

The racket supports 5, 5' have divided pieces 49, 49 divided into two at the center placed on pedestals 42, 42', and engaging edges 5 provided at the lower ends of the divided pieces 49, 49.
0 and 50 are engaged with the locking protrusions 48 and 48, the divided surfaces of the divided pieces 49 and 49 are butted together, and the other divided piece is separated from the center part near the upper end of one divided piece 49 and both parts near the lower end. Screws 54, 55, 56 from screw insertion parts 51, 52, 53 provided toward 49
Insert these screws 54, 55, 5
6 into the other divided piece 49 and each screw insertion part 5
The divided pieces 49, 49 are integrally connected by screwing into the threaded portions 57, 58, 59 provided so as to butt against each other.

On the racket supports 5, 5', a player is drawn on the front side of the rackets in a posture of trying to hit a ball with a racket, as shown in FIGS. 7 and 8, and spindles 10, 10' are drawn. A panel 61 having a through hole 60 therethrough may be attached, and the racket supports 5, 5' may be molded into a doll or other model, or built into the doll or other model.

The usage curve 15 of the cam plate 13 is the same as that of the cam plate 1.
A cam groove formed in the plate surface facing the link 17 of No. 3 so that the cam follower 19 fits therein, and a curved portion 15B that conveys the movement of swinging up the rackets 11 and 11', and a curved line that conveys the movement of swinging them down. The rackets 11 and 11' are driven four times each time the cam plate 13 rotates once. In addition,
The width of the groove in the curved portion 15A is wider than that in the curved portion 15B so that the cam follower 19 can move more freely.

On the outer periphery of the cam plate 13 are rackets 11, 11'.
4 corresponding to the position immediately before starting to hit the small ball 14
A ratchet wheel 62 in which claw portions 16 are arranged at equal intervals.
is provided.

Next, an embodiment of the spiral spring tightening mechanism 21 will be described. The main shaft 12 is equipped with a cam plate 13 and a ratchet wheel 6, which is provided with a box 20 containing a spiral spring.
3. Friction plate 64, gear 65, pressing spring 66
and the respective centers of the pressure adjustment plate 67, and the ratchet wheel 6
3 is fixed to the main shaft 12 so that it rotates together with the main shaft 12, and the cam plate 13, ratchet wheel 63, friction plate 64, gear 65, and pressure adjustment plate 67 are each attached to rotate freely. The outer end of the mainspring spring is suspended on a protrusion 68 protruding toward the periphery of the cam plate 13, and the inner end is suspended on a protrusion (not shown) protruding toward the center of the ratchet wheel 63. A base plate 69 is installed below the ratchet wheel 63 between the front and rear walls of the racket supports 5, 5'.
On the top surface of the base plate 69, when the cam plate 13 rotates in the same direction as the arrow, it slides into pressure contact with each pawl of the ratchet wheel 63 to loosen the rotation of the ratchet wheel 63, and the ratchet wheel 63 rotates in the opposite direction. A pawl plate 70 is fixed which stops the rotation of the ratchet wheel 63 if it hits one of the pawls of the ratchet wheel 63. A vertical shaft 71 is rotatably installed between the base plate 69 and the frame 43, and a pinion gear 72 that meshes with the rack gears 40, 40' is fixed near the bottom end of the vertical shaft 71, and near the top end of the vertical shaft 71. A crown gear 73 is fixed to the racket support body 5, 5'.
A transmission gear 75 which is rotatably supported by 4 and 4 is meshed with each other. Note that the pressure adjustment plate 67 is connected to the seaming mechanism 21
When assembling the racket support 5, 5', the pressing force of the pressing spring 66 may be adjusted so that the number of times the racket is driven is, for example, 20 times per tightening of the mainspring spring.
A lever connected to the pressure adjustment plate 67 may be made to protrude to the outside so that the pressing force of the pressure spring 66 can be arbitrarily adjusted before or during the game.

In the spring spring tightening mechanism 21, each racket support 5, 5' is grasped by hand and the elongated hole 39, 3 is tightened.
When reciprocating along 9', the rack gear 40,
Since the pinion gear 72 meshing with 40' reciprocates, the reciprocating rotation is transmitted to the gear 65 via the vertical shaft 71, the crown gear 73, and the transmission gear 75. The gear 65 is pressed against the friction plate 64 by a pressing spring 66, and the friction plate 64 is pressed against the ratchet wheel 63 by the pressure.
Since the gear 65 is in pressure contact with the side surface of the cam plate 1,
When the gear 65 rotates in the same direction as the rotation direction indicated by the arrow 3, the ratchet wheel 63 also rotates without engaging the pawl plate 70 to tighten the mainspring spring, and when the gear 65 rotates in the opposite direction, the pawl Since one of the claws of the wheel 63 abuts against the tip of the claw plate 70, the rotation of the ratchet wheel 63 is stopped and the spiral spring is held in the tightened state. By repeating the above operations,
As the winding of the mainspring progresses, rotational power is accumulated, and when it reaches the limit of winding, the spring pressure overcomes the frictional force of the friction plate 64, so the ratchet wheel 64
3 and the gear 65 begin to slide against the friction plate 64,
No matter how much the gear 65 rotates in the direction of the arrow, the spiral spring will not be tightened.

The rotational power described above is consumed each time the racket 11, 11' hits the small ball 14, and the above-mentioned mainspring spring gradually loosens. By moving each racket support 5, 5' back and forth several times along each long hole 39, 39', each time the gear 65 rotates in the direction of the arrow, the loosened spiral spring is tightened. The above-mentioned spiral spring can always be maintained at the limit state of tightening.

In place of the winding mechanism for the spiral spring, the present invention may employ a mechanism for manually winding the spiral spring directly.

Effects of the invention Since the present invention is configured as described above, after the racket is swung up, it returns to the position just before starting to hit the ball under its own weight, and does not overrun any further.
Moreover, since no extra spring pressure is applied to the racket drive shaft, it is possible to prevent the racket from swinging inadvertently after the racket hits the small ball until the small ball returns. The action of hitting the ball becomes more sensitive, and even if the force when the ball hits the racket is weak, the player can reliably hit the ball back.
In particular, if the usage curve of the cam plate is configured so that the racket is driven four times for each revolution of the cam plate as shown in the above embodiment, the number of times the racket is driven with respect to the rotational power accumulated in the spiral spring can be further increased. It has advantages such as being able to

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a plan view, Fig. 2 is a partially sectional side view, and Fig. 3 is a sectional view of the racket support and an enlarged view of the racket drive mechanism. FIG. 4 is a side view seen from the right side of FIG. 3 with the right half of the racket support in FIG. 3 removed, FIG. 5 is a partially sectional plan view of FIG. 3, Figure 6 is a bottom view of Figure 5, Figure 7 is an enlarged front view showing an example of the panel attached to the racket support, Figure 8 is a side view of Figure 7, and Figures 9 and 10 are of the racket. FIG. 9 is a diagram showing the racket starting to hit a small ball, and FIG. 10 is a diagram showing the racket being swung up. 1... Base board, 2... Board surface, 3, 3'... Guide rail section, 5, 5'... Racket support, 7...
Racket drive shaft, 11, 11'...Racket, 1
2...Main shaft, 13...Cam plate, 14...Small ball, 1
5...Usage curve, 16...Claw portion, 17...Link, 19...Cam follower, 20...Box with built-in spring spring, 21... Sealing mechanism, 22...
Stopper, 27... Engaging protrusion, 28... Engaging protrusion, 29... Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A board surface for rolling small balls is provided on the top surface of the base board, and racket supports are attached along both edges of the board surface so as to be movable back and forth, and inside each racket support The racket drive shaft includes a main shaft and a racket drive shaft supporting a racket for hitting a small ball rolling on the board surface, and a cam on the main shaft having a curve for transmitting the movement of hitting the small ball to the racket. A plate and a spring spring suspended to transmit rotational power to the cam plate are provided, a winding mechanism is connected to the spring spring, and a cam follower is connected to the racket drive shaft to engage with the usage curve of the cam plate. In a tennis game board formed by connecting links provided with a cam follower, the cam follower reciprocally engages with the curved portion of the cam plate's usage curve from the position where the racket is swung up to just before the ball starts to be hit. The cam plate is provided with a pawl corresponding to the position immediately before the racket starts hitting the small ball, and when the racket reaches the position just before the racket starts hitting the small ball, the pawl and the link are simultaneously attached. It has an engaging protrusion that engages,
The tennis game board is provided with a stopper which is biased by a spring and which brings the engaging protrusions into pressure contact with the pawl portion and the link. (2) The tennis game board according to claim 1, wherein the usage curve of the cam is a groove in which the cam follower engages. (3) The usage curve of the cam is shaped so that the curved part that transmits the movement of swinging the racket up and the curved part that transmits the movement of swinging it down are arranged alternately at 90 degree intervals around the main axis. A tennis game board according to claim 1 or 2 of the utility model registration claim. (4) The board surface on which the small ball is rolled has a top part in the middle,
A tennis game board according to any one of claims 1 to 3, which has a sloped surface that slopes downward from the top toward both edges of the board.