JPH0428141Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention rotates a mounting base by the driving force of a prime mover, and rotates a television receiver, fan cooler, speaker, etc. placed on the top of the mounting base. This invention relates to a turntable that rotates together with the mounting stand.

<Prior art> This rotary table rotates the television receiver by driving a motor when viewing images from, for example, a television receiver that is rotatably installed on the base.
The screen is turned towards the user so that the image can be seen. An example of a conventional rotary table includes a motor housed inside the outer box of a television receiver, a reducer connected to the motor and whose output shaft rotates at a slower speed than the rotating shaft of the motor, and a motor housed outside the television receiver. Some consist of gears fixed at the center of a base that corresponds to the center of rotation of the box. The gear provided on this base meshes with the gear provided on the output shaft of the reducer. When the user turns on the motor and drives it to rotate, this rotation is decelerated by the reducer and the gear on the output shaft rotates at a low speed, and this gear meshes with the gear installed on the base. This generates a rotational force that rotates around the outer circumference of the gear. This rotational force causes the television receiver to rotate on the base.

<Problems to be solved by the invention> In the conventional rotary table, the rotation of the motor installed in the TV receiver is transmitted through a reducer, and the gear installed on the output shaft of this reducer is connected to the gear installed on the base. Since the structure is such that the TV receiver is rotated by interlocking with each other, when the user is driving the motor to rotate the TV receiver so that the user can direct the TV receiver screen in a direction that is easy to view, the The problem is that if a finger or hand gets caught between the item and the outer box of the TV receiver, it may cause injury due to the force in the rotational direction of the TV receiver. As mentioned above, the motor, reducer, and gears are installed and connected, so even if you try to rotate the TV receiver by hand to change its orientation, the rotational resistance of the reducer etc. makes it easy. There is a problem in that it is difficult to rotate, and if forced to rotate with a large force, it may cause failure of connecting parts such as reduction gears.

<Means for solving the problem> The present invention is a rotary table in which a base and a platform are rotatably provided above the base, and the power generated by the prime mover is transmitted through a power transmission device to rotate the platform. In,
The power transmission device includes a first transmitting body provided to transmit power to the table, and a first transmitting body provided to be rotated by the power of the prime mover and in surface contact with the first transmitting body. and a second transmitting body provided between the contact surfaces of the first and second transmitting bodies so that rotation of the second transmitting body is transmitted to the first transmitting body when the above-mentioned table is in an unrestrained state. A connecting body configured to connect the first and second transmitting bodies and to disconnect the connection between the first and second transmitting bodies when the table is in a restrained state. It is.

<Function> The article placed on the top surface of the platform can rotate on the base together with the platform, and when the platform is in an unrestricted state, the connecting body connects the first transmitting body and the second transmitting body. connect,
The rotation generated by the prime mover is transmitted from the second transmitting body to the first transmitting body, and the platform rotates. When the platform is in a restrained state, the coupling body separates the first transmitting body and the second transmitting body, and the rotation generated by the prime mover is not transmitted from the second transmitting body to the first transmitting body. Does not rotate due to rotational force.

<Example> This example will be explained using FIGS. 1 to 6. In the figure, 1 is the base, 2 is the mounting table, 3 is the prime mover,
4 is a power transmission device.

The base 1 is circular, as shown in FIG. 4 in a plan view. The bottom portion 5 of the base 1 is made of a disc-shaped member, and an outer peripheral wall 6 is provided over the entire circumference of the bottom portion 5 and facing upward at a right angle to the bottom portion 5. The entire circumference of the outer peripheral wall 6 is divided into six equal parts, and a trochanter 7 is provided on the inner surface of each of the six equal parts. The trochanter 7 is disc-shaped, and a shaft 8 is inserted through the center of the trochanter 7 in a direction perpendicular to the disc surface.
is provided. Each trochanter 7 has a shaft 8 parallel to the bottom 5 of the base 1, an extension of the shaft 8 facing the center of the base 1, and is rotatable about the shaft 8. ing.

The platform 2 has a disk-shaped member 9 that is slightly smaller than the bottom 5 of the base 1, and an outer peripheral wall 10 that extends downward at right angles to the disk surface over the entire circumference of the disk-shaped member 9.
A protrusion 11 extending over the entire circumference is provided on the outer circumferential surface of the lower end of the outer circumferential wall 10 . A groove 12 is provided along the entire circumference of the protrusion 11 on the lower surface of the protrusion 11. The circumferential edges of the six trochanters 7 are engaged with the grooves 12, and the trochanters 7 and the grooves 12 are engaged with each other, so that the mounting base 2
is rotatably supported on the base 1. Reference numeral 13 shown in FIG. 5 is a stopper for preventing the platform 2 from coming off the base 1. The retainer 13 has a cylindrical member 14 whose lower end diameter is slightly smaller than its upper diameter and which projects from the lower surface of the center of the platform 2, and a through hole 17 that passes through the top and bottom of the base 1. A protrusion 16 that protrudes from the upper surface of the center of the base 1 and has a recess 15 on the lower surface of the base 1 at this protruding portion.
and a bolt 19 that fastens a washer 18 to the lower end surface of the cylindrical member 14 with the lower end of the cylindrical member 14 inserted into the through hole 17.
The cylindrical member 14 and the base 1 are rotatably engaged, and when force is applied to lift the platform 2, the upper surface of the washer 18 hits the recess 15 provided on the lower surface of the protrusion 16. This contact prevents the platform 2 from coming off the base 1. Furthermore, when a television receiver is placed on the top surface of the platform 2 and a load is applied to the platform 2, the lower surface of the step at the bottom of the columnar member 14 comes into contact with the outer periphery of the upper opening of the through hole 17. Mounting stand 2
The structure is such that it is supported so that it does not bend downward.

The prime mover 3 is an electric motor, and is installed approximately at the center of the base 1 with its rotating shaft 20 parallel to the top surface of the base 1.

The power transmission device 4 is provided between the rotating shaft 20 of the prime mover 3 and the platform 2, as shown in FIGS. a transmission body 21, a second transmission body 22 rotated by the power of the prime mover 3, and a first transmission body 21.
and the connecting body 2 provided between the contact surfaces of the second transmitting body 22
3, these include first to third shafts 24, 25, 26 which are spaced apart in the radial direction of the base 1 and rotatable in a direction perpendicular to the upper surface of the base 1.
It is mainly composed of gears etc. installed in the

That is, the first transmission body 21 is connected to the third shaft 26
a first pinion 27 inserted into the first pinion 27; an internal gear 32 meshing with the first pinion 27 and provided on the lower surface of the pedestal 2 along the inside of the outer peripheral wall 10 of the pedestal 2; 27 and a disk 33 integrally provided on the lower surface thereof.

The second transmission body 22 includes a worm 34 provided on the rotating shaft 20 of the prime mover 3, a worm wheel 35 inserted through the first shaft 24 so as to mesh with the worm 34, and a worm wheel 35 that is integrally attached to the upper surface of the worm wheel 35. A second pinion 28 is provided and inserted into the first shaft 24, and a second pinion 28 is inserted into the second pinion 28 so as to mesh with the second pinion 28.
A third large gear 29 inserted through the shaft 25 of the third large gear 29, a fourth small gear 30 provided integrally on the lower surface of the third large gear 29 and inserted through the second shaft 25, mesh with the fourth small gear 30. It consists of a fifth large gear 31 inserted through the third shaft 26 as shown in FIG. A compression spring 36 is inserted into the third shaft 26 between the lower surface of the fifth large gear 31 inserted into the third shaft 26 and the base 1. and pushes up the first small gear 27. The second small gear 28 and the worm wheel 35 are inserted into the first shaft 24 so that they do not move in the vertical direction and are rotatable with respect to the first shaft 24. The third large gear 29 and the fourth small gear 30 are inserted so that they do not move in the vertical direction and are rotatable relative to the second shaft 25. First small gear 27
The fifth large gear 31 is movable downwardly against the compression spring 36 and is inserted rotatably relative to the third shaft 26 .

The connecting body 23 includes a groove 40 formed near the outer edge of the lower surface of a disc 33 provided on the lower surface of the first pinion 27 so as to open downwardly to the disc 33 and to the outer circumferential side of the disc 33.
and a convex portion 41 having a size to fit into this groove 40 and provided on the upper surface of the fifth large gear 31 at a position corresponding to the groove 40. In the connecting body 23, the convex portion 41 and the groove 40 engage to connect the first small gear 27 and the fifth large gear 31.
When a rotational force of more than a predetermined value is applied to gear 3, the protrusion 41 comes off from the groove 40, and the first small gear 27 and the fifth large gear 3
This is a configuration that separates it from 1.

Reference numeral 42 shown in FIGS. 4 and 5 is a power supply unit that rotates the prime mover 3 in forward, reverse, or stop mode. Turn, reverse,
or stop it.

With the above-described configuration, the platform 2 is in an unrestricted state in which it can rotate with the television receiver 43 placed thereon, and the groove 40 and convex portion 41 of the connecting body 23 are arranged as shown in FIGS. 1 and 2. If you want to turn the screen of this television receiver 43 toward the user while the TV receiver 43 is engaged with The power supply unit 42 rotates the prime mover 3 in the forward or reverse direction depending on the rotation speed. The rotation of the rotating shaft 20 of the prime mover 3 is decelerated by the second transmission body 22 and the rotation is transmitted to the fifth large gear 31 . Since the groove 40 of the connecting body 23 and the convex portion 41 are engaged, the rotation of the fifth large gear 31 is transmitted to the first small gear 27. This first pinion 27
The rotation is transmitted to the internal gear 32, whereby the platform 2 rolls and rotates on the six rollers 7 provided on the base 1. When the screen of the television receiver 43 is rotated to a position facing the user, the operating switch is operated to stop the prime mover 3. Next, the platform 2 or the television receiver 43 may come into contact with nearby objects such as furniture, or a hand or finger may be caught between the furniture or the like and the television receiver 43, causing the platform 2 to rotate due to the drive of the prime mover 3. When the direction is restrained, a rotational force of a predetermined amount or more is applied to the coupling body 23 due to the rotational drive of the prime mover 3, and as shown in FIG. The rotation of the large gear 31 of No. 5 is not transmitted to the first small gear 27. Therefore, the platform 2 does not rotate. At this time, the fifth large gear 31 moves downward against the upward force of the compression spring 36. However, when the object that comes into contact with the mounting table 2 or the television receiver 43 and restricts its rotation is removed, the convex portion 41 of the connecting body 23 is removed from the groove 40 and the object is removed.
It rotates and engages the groove 40 again, and the fifth large gear 31
The rotation is transmitted to the first small gear 27, and the platform 2 rotates. Even when the groove 40 of the connecting body 23 and the protrusion 41 are not engaged, either the fifth large gear 31 on the protrusion 41 side or the first small gear 27 on the groove 40 side rotates once. It will be in the engaged state.

When changing the direction of the television receiver 43 without driving the prime mover 3, the user manually moves the television receiver 4
By applying a rotational force to 3, the connecting body 23
The convex portion 41 of the TV receiver 43 comes off from the groove 40.
rotates.

When a fan cooler that is heavier than the television receiver 43 is placed on the rotary table, a compression spring 36 with a large spring constant is used to increase the force that transmits the rotation of the connecting body 23.

In this embodiment, the connecting body 23 has a groove 40 provided on the lower surface of a disc 33 that is integrated with the first small gear 27 and a convex portion 4 provided on the upper surface of the fifth large gear 31.
1 is shown, but this groove 4
The grease 44 shown in FIG. It is also possible to transmit the rotation of the gear 31 to the first small gear 27. In this case, when the first small gear 27 is in the restrained state, the fifth large gear 3
1 and the first small gear 27 is broken, and rotation is not transmitted. In addition, instead of the first small gear 27, a short cylinder having a rubber plate or the like with a large friction coefficient attached to the entire outer periphery is integrally provided on the upper surface of the fifth large gear 31, and instead of the internal gear 32, A short cylinder with a rubber plate similar to the one above attached to the entire inner circumference is provided on the bottom surface of the platform 2, and the outer circumference of the short cylinder is brought into contact with the inner circumference of the short cylinder, so that when the short cylinder rotates, the rubber plates touch each other. The short cylinder and the platform 2 may be rotated together with the short cylinder due to frictional force.

<Effects of the invention> According to this invention, when a user is rotating the base by rotating the prime mover in order to direct the screen of a television receiver placed on the rotary table toward the user, the television reception Even if a hand or finger is caught between the outer box of the machine and an item such as furniture nearby, the coupling body of the power transmission device will separate the first and second transmission bodies and the prime mover will be shut off. Since the rotation is not transmitted to the mounting table, the effect is that fingers and hands are not injured. Furthermore, if the direction of the television receiver is changed by applying a force to rotate the television receiver or the mounting stand directly by hand, without relying on the rotational drive of the prime mover, the first transmitting body and the second transmitting body are separated. The TV receiver rotates. Therefore, there is an advantage that the user can directly change the orientation of the television receiver by hand without having to operate the operation switch to rotate the prime mover.

[Brief explanation of the drawing]

Fig. 1 is an enlarged fragmented sectional view of a connecting body according to one embodiment of this invention seen from the side, Fig. 2 is an enlarged longitudinal sectional front view showing the connected state of the connecting body of the same embodiment, and Fig. 3 is an embodiment of the same embodiment. FIG. 4 is a front view showing a state in which a television receiver is placed on the rotary table of the example, FIG. 4 is a fragmented sectional view of the rotary table of the same example seen from above, and FIG. FIG. 6 is an enlarged fragmented cross-sectional view of the separated state of the connecting body of the same embodiment as seen from the side direction, and FIG. FIG. 2 is a longitudinal sectional front view showing an example. 1... Base, 2... Mounting stand, 3... Prime mover, 4...
...power transmission device, 21...first transmission body, 22...
...Second transmission body, 23...Connection body.

Claims (1)

[Scope of utility model claims] A base and a rotating table are rotatably provided on the upper side of the base, and the power generated by the prime mover is transmitted through a power transmission device to rotate the platform, and the power transmission device transmits power to the side of the base. a first transmitting body provided to transmit the power; a second transmitting body provided to rotate by the power of the prime mover and in surface contact with the first transmitting body; The base is provided between the contact surfaces of the second transmitting body and connects the first and second transmitting bodies so that when the table is not restrained, the rotation of the second transmitting body is transmitted to the first transmitting body. A rotary table comprising: a connecting body configured to disconnect the connection between the first and second transmitting bodies when the table is in a restrained state.