JPH0346793Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention mainly focuses on the following: When a relatively large external force is applied to a loading platform that is attached to the body of a radio-controlled toy dump truck so that it can swing up and down, The present invention relates to a dump device for a toy dump truck that is capable of preventing internal mechanisms etc. from being damaged by this external force.

(Technical background of the invention and its problems) Conventionally, in the case of this type of dump truck toy, large external forces (for example, external forces caused by a child riding on the cargo platform) are applied to the cargo platform that is in an up-and-down swinging state. ), there was a risk that the dump device itself would be easily damaged.

(Purpose of the invention) Therefore, the present invention was devised to solve the conventional problems as described above. The purpose of this is to prevent damage to dump equipment, etc.

(Summary of the invention) In order to achieve the above-mentioned object, in the present invention, the rotational force of the motor M is transferred to the speed reduction mechanism G.
A driving gear 10 that is rotated by transmission through the driving gear 10, a cam plate 12 that is attached to this driving gear 10 and rotates together with the driving gear 10, and a swinging rod that is pressed by a moving pin 13 that projects from this cam plate 12. 21, and a swing shaft 20 which is horizontally mounted on the vehicle body 5 so as to be swingable; In a dumping device D of a toy dump truck T, the dumping device D is provided with a loading platform holder 22 connecting the loading platform 1 and the loading platform 1 is configured to swing up and down about the axis of a swing shaft 20 by the rotational force of a motor M. A substantially hemispherical concave engagement groove 11 provided on either the cam plate 10 or the cam plate 12; The escape mechanism S, which is composed of a hemispherical convex engagement protrusion 14 and a spring 16 that biases its own elastic force in a direction in which the engagement recess 11 and the engagement protrusion 14 approach each other, is connected to the drive gear 10 and the cam plate. The loading platform holder 22 is provided between the loading platform holder 22 and the loading platform holder 22 so that the lower part of the loading platform holder 22 and the upper part of the loading platform holder 22 are connected with each other with a part remaining.
A cushioning notch 24 is cut out to form the loading platform support 22 in a bendable manner.

(Embodiment of the invention) An embodiment of the invention will be described below with reference to the drawings.

In the figure, K is appropriately equipped with a reduction gear train, a transmission mechanism, etc., and the rotational force of the motor M1 is transmitted to each of the drive wheels W, so that the dump truck toy T is, for example,
A traveling device R configured to run in four-wheel drive (or two-wheel drive), and a dump device D that freely raises and rocks the platform 1 of the toy dump truck T.
The drive unit K is housed between the outer plates 19a, 19a and the inner plates 19b, 19b. The outer plate 19a is configured so that its outer surface can close the cutout groove of the chassis 6 through which the axle of the drive wheel W is inserted.

In addition, the dumping device D of the present invention is configured so that the rotational force of the motor M is transferred to a speed reduction mechanism G composed of a plurality of gears.
A driving gear 10 is built into the vehicle body 5 so as to be rotated by being transmitted through the driving gear 10, and a cam plate 12 is built into the vehicle body 5 so as to be attached to the driving gear 10 via an escape mechanism S and rotated together with the driving gear 10. A swing shaft 20 has a rod-shaped swing rod 21 that is pressed by a substantially cylindrical moving pin 13 protruding from the cam plate 12, and is horizontally mounted on the rear of the vehicle body 5 so as to be swingable.
and are fixed to both ends of a swing shaft 20 protruding laterally of the vehicle body 5 via fixing screws 26, and attached to pivot protrusions 2 protruding from both sides of the rear lower surface of the cargo platform 1. The loading platform 1 has a motor M.
It is configured to undulate and oscillate within a predetermined range about the axis of the oscillating shaft 20 with the rotational force of .

In other words, the rotational force of the motor M is transferred to the speed reduction mechanism G.
The rotational force of the driving gear 10 is transmitted to the driving gear 10 by appropriately decelerating the rotation, and the rotational force of the driving gear 10 is transmitted to the escape mechanism S.
is transmitted to the cam plate 12 via the cam plate 12.
The rotational force is transmitted to the swinging rod 21 by the movable pin 13, causing the swinging rod 21 to repeatedly swing within a predetermined range, and the loading platform 1 is moved within a predetermined range via the swinging shaft 20 and the loading platform support 22. It is formed to undulate and oscillate.

And the escape mechanism S of the dump device D of the present invention
A plurality of substantially hemispherical concave engagement grooves 11 are arranged on one side surface of the driving gear 10 at predetermined intervals in the circumferential direction, and an appropriate number of engagement grooves 11 are removably engaged with the engagement grooves 11. The substantially hemispherical concave engaging protrusion 14 is connected to the driving gear 1.
The shaft portion 15 of the cam plate 12 is rotatably and slidably inserted into the driving gear 10, and a set screw 18 is inserted at the tip of the shaft portion 15. A spring presser 17 fixed via the spring presser 17 and the inner plate 19b
and a spring 16 interposed between the
The cam plate 12 is formed to be elastically pressed at all times toward the driving gear 10, and when a strong load is applied to the movable pin 13 of the cam plate 12, the cam plate 12 engages with the engagement protrusion 14. It is configured such that the engagement state with the matching groove 11 is released against the elastic force of the spring 16.

The loading platform support 22 is inserted into a hole drilled in the pivot protrusion 2, and has a boss 25 provided with a square hole that fits into both ends of the swing shaft 20, and an upper surface that is in close contact with the lower surface of the loading platform 1. The receiving plate 23 is integrally formed with a suitable synthetic resin material (for example, Delrin), and the receiving plate 23 is provided with a boss 2.
The receiving plate 2 has a lower part of the receiving plate 23 in which a buffer notch 24 is cut out along the outer peripheral surface of the receiving plate 5 and a boss 25 is continuously provided, and an upper surface that is in close contact with the lower surface of the loading platform 1.
3 is formed so that the upper part of the loading platform 1 is connected to the upper part of the loading platform 1, leaving a part of the upper part of the upper part of the loading platform 1.
4 so that it can be buffered.

By the way, the shape, number, etc. of the engaging groove 11 and the engaging protrusion 14 are different from that of the engaging groove 1 in a normal state.
1 and the engagement protrusion 14 can be reliably maintained,
The rotational force of the driving gear 10 can be reliably transmitted to the cam plate 12, and when a strong load exceeding a predetermined value is applied to the cam plate 12, the engaged state is opposite to the elastic force of the spring 16. As long as the structure is such that it can be smoothly released, the structure is not limited to the illustrated example, and can be set as desired. Further, the buffer notch 24 of the loading platform holder 22 may be provided so that the loading platform holder 22 can be appropriately bent and the loading platform holder 22 itself is not damaged by this bending.
The shape is not limited to the illustrated example.

Furthermore, the dump truck toy T can be operated by radio control to move forward, reverse, change direction, change gears for gear change, etc., and can start and stop the motor M for raising and rocking the loading platform 1. Alternatively, these operations may be performed by wired control or by manual switching.

The present invention is constructed as described above, and in its use, first, when the motor M is driven to rotate, the speed reduction mechanism G, which meshes with the pinion of the motor M and is set to an appropriate reduction ratio, driving gear 1
0 rotates, and the cam plate 12 rotates due to the engagement between the engagement recess 11 and the engagement protrusion 14 of the relief mechanism S. Then, when the movable pin 13 of the cam plate 12 revolves while pushing the swinging rod 21 upward toward the tip side of the swinging rod 21, the swinging shaft 20 and the receiving plate 23 rotate, and the swinging shaft 20 rotates. The loading platform 1 swings upward about its axis. Further, after the cam plate 12 rotates and the movable pin 13 reaches the uppermost position and the inclination angle of the loading platform 1 becomes the maximum, the movable pin 13 moves toward the base end of the rocking rod 21. It revolves while supporting. At this time, the loading platform 1 swings so as to descend at a faster speed than the previous rising speed, and once it is in a horizontal state, the above-described operation is repeated. Note that by arbitrarily stopping the rotation of the motor M, the loading platform 1 can be supported at an arbitrary inclination angle. By the way, when a strong external force is applied from above to the loading platform 1 which is in an up-and-down swinging state, that external force is weakened by being buffered by the buffer notch 24 of the loading platform support 22, and furthermore, with this weakened external force, The relief mechanism S operates, and the force applied to the cam plate 12 is not transmitted to the driving gear 10, thereby preventing damage to the reduction gear mechanism G and the like. That is, as shown in FIG. 5, when the moving pin 13 is pressed by the swinging rod 21,
The cam plate 12 attempts to rotate relative to the driving gear 10, and this rotational force causes the engagement protrusion 14 to engage the spring 1.
The cam plate 12 moves out of the engagement groove 11 against the elastic force of the cam plate 14, and the engagement state between the engagement protrusion 14 and the engagement groove 11 is released, and the rotation of the cam plate 12 is caused by the rotation of the driving gear 1.
0 will no longer be transmitted.

(Effect of the invention) Therefore, according to the dumping device D of the invention, when a strong external force is applied to the loading platform 1 in an up-and-down swinging state, the escape mechanism S between the drive gear 10 and the cam plate 12 operates to reliably release the engagement between the driving gear 10 and the cam plate 12, the rotation of the cam plate 12 is no longer transmitted to the driving gear 10, and damage to the dumping device D itself can be reliably prevented. Become. Further, the external force applied to the loading platform 1 in the up-and-down swinging state can be buffered and weakened by the buffer cutout 24 of the loading platform support 22, and excessive external force can be prevented from being transmitted to the swinging shaft 20. This will help prevent damage to the dump device D. Moreover, it has a simple configuration, can be expected to operate reliably, is easy to manufacture, and has excellent robustness and durability.

As explained above, according to the present invention, even if a large external force is applied to the loading platform in an up and down swinging state, the dumping device etc. will not be damaged, and it is safe even if handled roughly by young children. The structure is simple and can be provided at low cost, which is extremely useful in practice.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway front view of a dump truck toy, FIG. 2 is a partially cutaway exploded perspective view of the main part, FIG. 3 is a schematic front view of the main part, and FIG. FIG. 4 is a partially cutaway bottom view of the drive unit, and FIG. 5 is a partially cutaway plan view of the main part. T... Dump truck toy, 1... Loading platform, 2...
... Pivot protrusion piece, 5 ... Vehicle body, 6 ... Chassis, 7 ...
...Body, 8...Drive unit housing section, K...
Drive unit, D...Dump device, M...Motor, G...Deceleration mechanism, S...Escape mechanism, 10...
Drive gear, 11... Engagement groove, 12... Cam plate,
13...Moving pin, 14...Engaging protrusion, 15...
Shaft portion, 16... Spring, 17... Spring retainer, 18... Set screw, 19a... Outer plate, 19
b... Inner plate, 20... Swing shaft, 21... Swinging rod, 22... Loading platform holder, 23... Buffer plate, 24... Buffer notch, 25... Boss, 26... Fixing screw, R
... Traveling device, M1 ... Motor, W ... Drive wheel.

Claims (1)

[Scope of utility model registration request] A driving gear that rotates when the rotational force of the motor is transmitted through a reduction mechanism, a cam plate that is attached to this driving gear and rotates together with the driving gear, and a rocking motion that is pressed by a movable pin that protrudes from this cam plate. A rocking shaft that has a rod and is horizontally mounted on the vehicle body so as to be swingable, and a loading platform that is fixed to both ends of the rocking shaft and to the rear of the loading platform to connect the rocking shaft and the loading platform. In a dumping device for a toy dump truck, the loading platform is configured to swing up and down about the axis of a swinging shaft by the rotational force of a motor, and a substantially hemispherical concave surface provided on either the driving gear or the cam plate. an engagement groove, a substantially hemispherical convex engagement protrusion that removably engages with the engagement groove and is provided on either the cam plate or the drive gear, and an engagement groove and the engagement protrusion that are mutually connected to each other. An escape mechanism consisting of a spring that biases its own elastic force in the direction in which the cams approach is provided between the driving gear and the cam plate, so that the lower part of the loading platform holder and the upper part of the loading platform holder remain partially intact. 1. A dump device for a toy dump truck, characterized in that a buffer notch is cut out in a load platform support so that the load platform support can be bent so as to be connected to the load platform support.