KR101459383B1

KR101459383B1 - 3-Axis caster

Info

Publication number: KR101459383B1
Application number: KR20140016429A
Authority: KR
Inventors: 배동권
Original assignee: 배동권
Priority date: 2014-02-13
Filing date: 2014-02-13
Publication date: 2014-11-07
Also published as: WO2015122708A1

Abstract

The present invention relates to a wheeled transporting device and, more specifically, to a triaxial caster wherein casters is disposed in a triaxial direction. The triaxial caster comprises: a Y-shaped frame which rotates about a rotation shaft in the center; and three casters installed in the end of a branch constituting the Y-frame. According to the present invention, the present invention is to provide the triaxial caster capable of easily going over an obstacle.

Description

Triaxial castor {3-Axis caster}

The present invention relates to a wheel of a mobile device, and more particularly to a triaxial caster in which the casters are arranged in triaxial form.

Conventionally, casters (casters) have been widely used for facilitating the direction change of the mobile device. For example, there are casters applied to a chair, a moving table, a carrier, and a stroller.

Figure 1 shows a conventional castor.

Referring to FIG. 1, a conventional caster 100 includes an axle 106 extending in a direction perpendicular to a wheel axis 104 of a rolling wheel 102 of a radius D, And a main shaft 108 spaced apart from the main shaft 108 by a predetermined distance t. The case 110 houses the axle 106 and the main shaft 108. The main shaft 108 is rotatably mounted on the case 110 on a horizontal plane. The upper end of the main shaft 108 is attached, for example, to the base frame (not shown) of the mobile device.

The conventional caster 100 is capable of rotating 360 degrees on the horizontal plane around the main shaft 108 since the main shaft 108 is installed by being tilted with respect to the axle 106 by t.

By installing the caster 100 on the mobile device, the traveling direction of the mobile device can be freely adjusted.

However, since such casters 100 are installed on the bottom of the moving devices, there is a problem that if the rolling wheels 102 are encountered with obstacles that can not be overcome, inconvenience is caused in the traveling of the moving devices. Particularly, when the rolling wheel 102 is small in size, it is very inconvenient to lift the moving device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-axis castor that can easily overcome an obstacle.

The triaxial caster according to the present invention for achieving the above-

In a triaxial caster mounted on a mobile device,

A Y-shaped frame rotating about a central rotation axis; And

Three casters provided at the ends of each branch constituting the Y-shaped frame;

And a control unit.

Here, it is preferable that an angle between each branch constituting the Y-shaped frame is maintained at 120 degrees.

Here, the rotary shaft gear integrated with the rotary shaft;

A caster angle adjusting gear installed at an end of each of the branches;

A first direction switching gear engaged with the rotary shaft gear;

A second direction switching gear engaged with the first direction switching gear;

An angle conversion gear integrally provided with a step with respect to the second direction switching gear;

A chain connecting the angle changing gear and the caster angle adjusting gear; And

And a caster fixing case integrally formed on the outer side of the angle adjusting gear and to which the caster is fixed.

On the other hand, a base caster bracket rotatably coupled to the rotation shaft and extending horizontally in a radial direction from the rotation shaft;

A base casters main axis extending in the vertical direction at the end of the base casters bracket and installed to be rotatable in the left and right direction relative to the base casters brackets;

.

The triaxial caster according to the present invention has the effect of allowing the moving device to easily cross an obstacle by providing a caster at the end of each branch constituting the Y-shaped frame.

In addition, by providing the base casters bracket and the base casters main axes in the triaxial casters according to the present invention, an additional casters function can be imparted to the triaxial casters.

Further, in the triaxial casters according to the present invention, by rotating each of the casters in the opposite direction in accordance with the rotation of the frame, it is possible to exhibit a sufficient caster function with respect to the casters located at the rear side with respect to the traveling direction.

Figure 1 shows a conventional castor.
Fig. 2 shows the structure of a triaxial caster according to the present invention.
Figure 3 shows an embodiment of a triaxial caster in accordance with the invention.
FIG. 4 illustrates movement of a mobile device using a triaxial caster according to the present invention.
Figure 5 shows another embodiment of a triaxial caster in accordance with the invention.
Figure 6 shows the geometry and appearance of the arrangement shown in Figure 5;
Fig. 7 shows a structure of a base caster to which a triaxial caster according to the present invention is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Fig. 2 shows the structure of a triaxial caster according to the present invention.

2, a triaxial caster 200 according to the present invention includes a Y-shaped frame 204 that rotates about a central rotation axis 202, and a respective branch 204a, 204b, 204c of a Y- And three casters 206 (206a, 206b, 206c) installed at the ends of the caster.

Here, the casters 206a, 206b, 206c have a configuration similar to that of the conventional caster 100 shown in Fig. Since the caster 206a, 206b, 206c have the same configuration, the caster 206 is used.

The length of each branch 204a, 204b, 204c is the same, and the length thereof and the size of the caster 206 can be appropriately designed according to the size and kind of the obstacle.

The caster 206 is rotatably formed on a rolling wheel 206-2 and a rotating shaft 206-1 that rotate about a rotating shaft 206-1 and is rotated from a rotating shaft 206-1 to a rolling wheel 206-2 A fixed bracket 206-3 extending horizontally in the radial direction of the fixed bracket 206-3 and a main shaft 206-4 extending in the vertical direction and rotatably installed at the end of the fixed bracket 206-3.

Here, the angle between each branch 204a, 204b, 204c is set to have an angle of 120 degrees.

A wheel axle (not shown) may be installed on the rotary shaft 202 in the lateral direction. That is, one triaxial caster 200 of the present invention may be installed at both ends of the wheel axle, and a steering device may be installed on the wheel axle.

Figure 3 shows an embodiment of a triaxial caster in accordance with the invention.

3, the wheel axles 302 are provided in the lateral direction between the rotational axes 202-1 and 202-2 of the two triaxial casters 200-1 and 200-2, And a steering device 304 is provided at the center. By adjusting the steering device 304, the wheel axle 302 rotates to the left and right.

3, the traveling direction of the casters 206b and 206c contacting the ground is controlled by the steering device 304. [

FIG. 4 illustrates movement of a mobile device using a triaxial caster according to the present invention.

4A, wheel shafts 402-1 and 402-2 are provided on the front and rear of the mobile device 400, and on both ends of the respective wheel shafts 402-1 and 402-2, It is shown that casters 200 are installed. A steering device 404 is provided on the front wheel shaft 402-1.

When the steering device 404 is rotated to the right, the rolling wheels of the three-axis casters 200 in the forward direction in the moving direction among the two rolling wheels touching the ground rotate in the rotating direction, Is directed to the right as shown in (c).

When the moving device 400 moves in the steering direction, the front rolling wheels of the three rolling wheels 200 touching the ground coincide with the traveling direction.

Even if the steering apparatus 404 is adjusted as shown in FIG. 4 (b), among the two rolling wheels contacting the ground from the three-axis casters 200 installed on both sides of the front wheel shaft 402-1, The rolling wheels rotate in the steering direction, but the rolling wheels in the rear are unable to rotate in the steering direction and maintain their original straightness.

This is because, as shown in FIG. 2, the main shaft 206-4 of the rear casters is in parallel with the ground, so that it is difficult for the rolling wheels 206-2 to easily turn right and left.

Figure 5 shows another embodiment of a triaxial caster in accordance with the invention.

The apparatus shown in FIG. 5 keeps the main shaft of the caster 206, which is in the backward direction in the traveling direction, perpendicular to the ground even if the Y-shaped frame 204 of the triaxial caster 500 rotates.

5 includes a rotary shaft gear 502 integrally formed with a rotary shaft 202 and a caster angle adjusting gear 504 coupled with a main shaft 206-4 of the caster 206 , And the main shaft 206-4 of the caster 206 is rotated by the amount of rotation of the Y-shaped frame 204. [

The rotary shaft gear 502 is integrally formed with the rotary shaft 202, and the Y-shaped frame 204 rotates about the rotary shaft 202. Since the rotary shaft gear 502 is fixed to the rotary shaft 202, as the Y-shaped frame 204 rotates about the rotary shaft, the first direction switching gear 506 rotates in the rotation direction of the Y-shaped frame 204 .

The driving force generated by the rotation of the first direction switching gear 506 is transmitted to the caster fixing case 504 through the second direction switching gear 508, the angle changing gear 510, the chain 512, 514, respectively. It should be noted that although the rotational directions of the first direction switching gear 506 and the second direction switching gear 508 are opposite to each other, the rotational directions of the second direction switching gear 508 and the caster angle adjusting gear 504 are the same do.

Referring again to FIG. 5, it can be seen that the second direction switching gear 508 is a gear having a step. This step is provided so that the caster angle adjusting gear 504 is disposed higher than the rotating shaft gear 502, and therefore, the step is equivalent.

5, the caster angle regulating gear 504 is positioned at a high level with respect to the rotation axis gear 502. As shown in FIG. This is necessary to allow the caster 206 to rotate 360 degrees at the end of the Y-shaped frame 204. Therefore, the angle changing gear 510 is provided with a step on the second direction switching gear 508, the lower second direction switching gear 508 is engaged with the first direction switching gear 506, And the chain 512 is interposed between the angle change gear 510 and the caster angle adjusting gear 504.

A caster fixing case 514 is integrally formed on the caster angle adjusting gear 504 and the main shaft 206-4 of the caster 206 is fixed to the caster fixing case 514. The caster fixing case 514 is provided outside the caster angle adjusting gear 504 so that the caster 206 can rotate 360 degrees around the caster angle adjusting gear 504, The main shaft 206-4 of the caster 206 is fixed.

The main shaft 206-4 rotates in the opposite direction by the amount of rotation of the Y-shaped frame 204 by the action of the caster angle adjusting gear 504. As a result, it becomes possible for all of the main axes 206-4 of the casters 206 contacting the ground to be perpendicular to the ground.

Figure 6 shows the geometry and appearance of the arrangement shown in Figure 5;

6A, the caster angle adjusting gears 504 are arranged in an equilateral triangle with respect to the rotation axis 206-1.

The caster fixing case 514 is integrally formed with the caster angle adjusting gear 504 and rotates in accordance with the rotation of the caster angle adjusting gear 504.

6, since the main shaft 206-4 of the caster 206 is fixed to the caster fixing case 514, the caster 206 is fixed to the caster fixing gear 514 in accordance with the rotation of the caster adjusting gear 504, 206 rotate together.

Fig. 7 shows a configuration of a modified embodiment of a triaxial caster according to the present invention.

The apparatus 700 (hereinafter referred to as a base caster) shown in Fig. 7 is mounted on the bottom surface of the base frame of the mobile device and includes a triaxial caster 200 as shown in Fig. 2, a rotary shaft 202 And a base castor main shaft 708 extending in the vertical direction from the end (opposite to the rotation axis) of the base casters bracket 706. The base casters 706 are rotatably formed on the base casters 706, The base casters main spindle 708 is rotatable to the left and right relative to the base casters bracket 706.

That is, the mobile device 300 of FIG. 7 is a type having a caster that uses the three-axis casters 200 according to the present invention as one rolling wheel. Since the triaxial caster 200 itself can not exhibit the caster function, the base caster bracket 706 and the base caster main shaft 708 can be used to perform the caster function.

Specifically, the base casters main shaft 708 is spaced apart from the rotational axis 202 of the triaxial casters 200 by a predetermined distance in the horizontal direction, and is freely rotatable in the left and right directions with respect to the base casters bracket 708 , The triaxial caster 200 is easily moved according to the steering direction of the base frame.

200 ... Three Axis Casters
202 ... rotation axis 204 ... Y-shaped frame
206 ... casters
302, 402 ... wheel axles 304, 404 ... steering device

Claims

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In a triaxial caster mounted on a mobile device,
A Y-shaped frame rotating about a central rotation axis; And
Three casters provided at the ends of each branch constituting the Y-shaped frame;
/ RTI >
A rotary shaft gear integrated with the rotary shaft;
A caster angle adjusting gear installed at an end of each of the branches;
A first direction switching gear engaged with the rotary shaft gear;
A second direction switching gear engaged with the first direction switching gear;
An angle conversion gear integrally provided with a step with respect to the second direction switching gear;
A chain connecting the angle changing gear and the caster angle adjusting gear; And
And a caster fixing case integrally formed on an outer side of the angle adjusting gear and having the caster fixed thereto.

The method of claim 3,
A base caster bracket rotatably coupled to the rotation shaft and extending horizontally in a radial direction from the rotation shaft; And
A base casters main axis extending in the vertical direction at the end of the base casters bracket and installed to be rotatable in the left and right direction relative to the base casters brackets;
Further comprising a plurality of torsionally mounted casters.