KR102175360B1 - Apparatus for mounting caster and serving cart using the same - Google Patents

Abstract

Provided is an apparatus for fixing driving wheels, which can effectively protect the driving wheels and minimize damage. To this end, the apparatus for fixing driving wheels includes connectors installed on a lower end of a vertical frame of a movable structure to fix the driving wheels and cover and protect brackets of the driving wheels.

Description

Driving wheel fixing device and serving cart using the same {APPARATUS FOR MOUNTING CASTER AND SERVING CART USING THE SAME}

The present disclosure relates to a driving wheel fixing device and a serving cart using the same.

In general, tables, carts, chairs, etc., which require free travel for transporting or moving goods, are provided with driving wheels that rotate in contact with the ground.

For example, in restaurants and hotels, serving carts are widely used to carry food and the like. The serving cart is a rectangular frame structure, and includes at least one shelf installed along a vertical bar supporting each corner to place a package. Driving wheels for movement are installed at the bottom of the serving cart.

Accordingly, when the user places a bowl or other heavy object containing food on the shelf and pushes the serving cart, the driving wheel at the bottom is rolled and the serving cart can be easily moved to a desired position.

A separate part is provided for the driving wheel, so it can be installed and used where necessary. For example, the driving wheel may be installed at the bottom of a vertical bar that forms the corner of the serving cart.

When the installation structure of the driving wheel is complicated and cumbersome, the assembly work for the serving cart is difficult and a lot of time and effort is required. In addition, in the case of a structure in which the driving wheel is simply inserted under the vertical bar, the operation is easy, while the driving wheel is easily removed from the serving cart. In addition, because the driving wheel is not properly supported or is exposed to the outside as it is, it is not protected and is easily damaged.

Recently, driving wheels of various structures have been developed. Accordingly, improving the installation structure of the driving wheel can provide many advantages to the user.

The present task is to provide a serving cart driving wheel fixing device and a serving cart using the same, which is easy to install and can be more robustly assembled.

The present task is to provide a serving cart driving wheel fixing device and a serving cart using the same, so that the driving wheel can be more easily fixed to the serving cart while the driving wheel is assembled.

The present task is to provide a serving cart driving wheel fixing device and a serving cart using the same to more effectively protect the driving wheel and minimize damage.

The driving wheel fixing device of this embodiment may include a connector installed at the bottom of the vertical frame of the moving structure to fix the driving wheel and cover and protect the bracket of the driving wheel.

The driving wheel includes a driving wheel, a shaft member supporting the rotating shaft of the driving wheel, a bracket rotatably installed on the shaft member, a bolt shaft extending perpendicularly to the bracket, and an elastic member fitted to the bolt shaft. , A washer fitted to the bolt shaft to support the lower end of the elastic member, and a tightening nut that is screwed to the bolt shaft to pressurize the elastic member to elastically deform it.

The connector is formed on the upper end, a coupling portion coupled to the vertical frame of the moving structure, a body integrally formed under the coupling portion, and having a coupling hole through which an elastic member of the driving wheel is inserted and coupled therein, and at the bottom of the body It is formed and extends to the outer peripheral portion of the bracket of the driving wheel may include a cover portion covering the upper bracket.

The coupling portion may have a structure that is formed with a relatively smaller diameter than the body, forms a stepped portion with the body and extends upward, and a nut member is installed in a hole formed along the center to be screwed to a fastening bolt installed on the vertical frame. .

The lower end of the connector may be formed in a shape corresponding to the cross-sectional shape of the upper end of the bracket and may have a structure in close contact with the upper end of the bracket.

The bracket is rotatably installed on the shaft member via a bearing, and the bracket is formed with an arc-shaped seating portion on which the bearing is seated protrudes upward, and the connector is formed in the protruding seating groove of the bracket at the bottom of the cover portion. Correspondingly, concave portions recessed in an arc shape may be formed.

The tightening nut includes a head portion and a flange portion extending outwardly from a lower end of the head portion to be in close contact with the upper end of the elastic member, and being in close contact with the elastic member by the flange portion to move like the elastic member. I can.

The bracket may include a fixing part for elastically deforming the elastic member by preventing the rotation of the tightening nut when the bolt shaft rotates through the ranch part and preventing rotation of the tightening nut when the bolt shaft rotates through the ranch part. .

The fixing part may include at least one or more protrusions protruding from the lower end of the tightening nut and pressed against the front end of the elastic member.

The fixing portion may further include at least one groove portion formed on the front end of the elastic member to engage the protrusion.

The fixing part may include an end formed on an inner upper end of the coupling hole of the connector and contacting the tightening nut to regulate rotation of the tightening nut.

The fixing portion may include a fitting groove formed in a shape corresponding to the head portion of the tightening nut to be fitted and coupled to the head portion.

The serving cart of the present embodiment includes a plurality of vertical frames, a fastener fitted to the vertical frame, a shelf connected between the fasteners and disposed horizontally between the vertical frames, a driving wheel coupled to the bottom of the vertical frame, It may include a connector installed at the bottom of the vertical frame to secure the driving wheel and cover and protect the bracket of the driving wheel.

As described above, according to the present embodiment, the driving wheel is simply installed by being inserted into the vertical bar of the serving cart via the connector, so that installation is easy and time and effort required for work can be reduced.

Since the driving wheel can be fixed from the outside while the driving wheel is mounted on the vertical bar of the serving cart, the work is easy and the installation work can be performed more conveniently.

By covering and protecting the driving wheel by the connector, it is possible to prevent rust or damage due to exposure of the main part of the driving wheel to the outside.

The connection between the connector and the bracket of the driving wheel is tightly fixed to prevent the driving wheel from shaking due to external shock during use, minimizing damage to the driving wheel, and improving driving stability when in use.

1 is a schematic exploded perspective view showing a serving cart having a driving wheel fixing device according to the present embodiment.
Figure 2 is a schematic perspective view showing a driving wheel fixing device according to the present embodiment.
3 is a schematic perspective view showing a state in which a driving wheel is mounted on the fixing device according to the present embodiment.
4 is a cross-sectional view of a driving wheel fixing device according to the present embodiment.
5 is a schematic view showing a fastening nut fixing structure of the driving wheel fixing device according to the present embodiment.
6 is a schematic cross-sectional view showing a device for fixing a driving wheel according to another embodiment.

Hereinafter, an embodiment of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later. The embodiments described later may be modified in various forms without departing from the concept and scope of the present invention. As far as possible, the same or similar parts are indicated using the same reference numerals in the drawings.

The terminology used below is only for referring to specific embodiments, and is not intended to limit the present invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising" as used in the specification specifies a specific characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component and/or group It does not exclude the existence or addition of

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the following examples are only preferred examples of the present invention and the present invention is not limited to the following examples.

Hereinafter, the present embodiment will be described by way of example of a structure for fixing a driving wheel to a serving cart. The fixing device of the present embodiment is not limited to the serving cart, and can be applied to all of the various moving structures on which the driving wheels are mounted.

1 shows a serving cart according to this embodiment.

As shown, the serving cart 100 of this embodiment includes a plurality of shelves 110 arranged horizontally so as to place articles, and a vertical frame 120 supporting and supporting the shelves 110. It can be made of a frame structure. A handle 130 may be provided on the top of the serving cart 100.

The vertical frame 120 is disposed at the corner of the serving cart 100 to form a vertical skeleton. In this embodiment, the vertical frame 120 may be separated into a plurality of cylindrical pipe structures, and may be fitted and coupled between the ends. The shelf 110 may be installed between the vertical frames by being coupled to the fastener 140 installed by being fitted to the vertical frame 120. Accordingly, the shelf 110 may be coupled to the fastener 140 installed in accordance with the set position of each vertical frame and disposed horizontally. The shape or structure of the serving cart 100 and the structure for assembling the shelf 110 including the fastener 140 may be variously modified.

Driving wheels 150 are installed at the bottom of each vertical frame 120.

In the following description, the term “lower” or “lower” refers to a lower direction along the z-axis direction in FIG. 2 in a direction toward the ground on which the serving cart is placed, and “up” or “upper” means an upward direction along the z-axis direction in the opposite direction. .

As shown in Fig. 2, the driving wheel 150 includes a driving wheel 151, a shaft member 152 supporting the rotation axis of the driving wheel 151, and a bracket rotatably installed on the shaft member 152 ( 153), the bolt shaft 154 extending vertically to the bracket 153, the elastic member 155 inserted into the bolt shaft 154, and the elastic member 155 inserted into the bolt shaft 154 to support the lower end of the elastic member 155 It may include a washer 156 and a tightening nut 157 that is screwed to the bolt shaft 154 to pressurize the elastic member 155 to elastically deform it.

The shaft member 152 is bent to both sides of the driving wheel 151 to support the rotation shaft so that the driving wheel 151 is rotatable. A bracket 153 may be rotatably installed on an upper portion of the shaft member 152 via a bearing (158 in FIG. 4).

In this embodiment, the bracket 153 has a groove recessed in an arc shape on an inner circumferential surface along the circumferential direction to surround the bearing 158 installed between the shaft member 152. By forming a groove in the inner surface of the bracket as described above, the mounting portion 159 is formed by protruding outward from the upper portion of the bracket 153 and having an arc-shaped cross-sectional shape. The seating portion can be understood as a deformed protruding portion of the bracket to form a bearing seating space inside the bracket.

The bracket 153 has a multi-angled outer circumferential surface to form a ranch unit 160. For example, the ranch unit 160 may have a regular octagonal shape. The ranch unit 160 is a portion to which a wrench tool is coupled to rotate the bracket 153. The bolt shaft 154 fixedly installed on the bracket 153 can be easily rotated by using the ranch unit 160. When a tool such as a ranch is hooked on the ranch unit 160 and rotated, the bolt shaft 154 installed on the bracket 153 can be rotated.

The bolt shaft 154 is vertically extended to the upper part of the bracket 153 and fixedly installed. The bolt shaft 154 is formed with a screw thread on the upper outer circumferential surface to be screwed with the tightening nut 157. An elastic member 155 is fitted to the bolt shaft 154 and installed.

The elastic member 155 forms a cylindrical shape through which the center is penetrated along the axial direction. The elastic member 155 may be formed of a material that is elastically deformable against an external force. For example, the elastic member 155 may be formed of a rubber or silicone material.

The lower and upper ends of the elastic member 155 are supported in contact with the washer 156 and the tightening nut 157 installed on the bolt shaft 154, respectively. The washer 156 is fitted to the bolt shaft 154 to support and support the lower end of the elastic member 155.

The tightening nut 157 is screwed to the upper end of the bolt shaft 154 to closely support the upper end of the elastic member 155. The tightening nut 157 presses the elastic member 155 while being tightened or loosened along the bolt shaft 154 to move.

The elastic member 155 is elastically deformed by being pressed in the axial direction by a tightening nut 157 that is tightened along the bolt shaft 154. Accordingly, the elastic member 155 is deformed outward while being contracted by receiving a force in the axial direction. Therefore, the elastic member 155 can be firmly fixed to the connector 10 by expanding its outer diameter while bulging outward. The tightening nut 157 is in close contact with the upper end of the elastic member 155 and can move like the elastic member 155. The structure of the tightening nut 157 will be described in more detail later.

In this embodiment, the driving wheel 150 may be fixedly installed at the bottom of the vertical frame 120 through the connector 10.

Hereinafter, a fixing structure for installing the driving wheel 150 on the vertical frame 120 will be described with reference to FIGS. 3 and 4.

The connector 10 is installed at the bottom of the vertical frame 120 to fix the driving wheel 150, and has a structure to cover and protect the bracket 153 of the driving wheel 150.

To this end, the connector 10 of this embodiment is formed at the top and is integrally formed with the coupling portion 12 coupled to the vertical frame 120 and the lower coupling portion 12, and the elastic member of the driving wheel 150 therein The body 14 having the coupling hole 15 to which the 155 is inserted and coupled, is formed at the bottom of the body 14 and extends to the outer peripheral portion of the bracket 153 of the driving wheel 150 to cover the upper part of the bracket 153 (16) may be included.

The connector 10 may be formed of a non-metallic material. For example, the connector 10 may be formed of a thermosetting resin material. Thus, it is easy to manufacture and prevent rust from occurring.

In this way, according to the present embodiment, the driving wheel 150 can be more conveniently mounted on the vertical frame 120 by using the connector 10. In addition, by covering the bracket 153 at the upper end of the driving wheel 150 by the cover portion 16 at the lower end of the connector 10, it is possible to prevent the bracket 153 from being rusted or damaged because it is not exposed to the outside.

The connector 10 may be elongated along the vertical direction and may form a cylindrical shape through which the inside is penetrated. The body 14 of the connector 10 may be formed with a diameter corresponding to the outer diameter of the vertical frame 120. Accordingly, the connector 10 may be smoothly connected to the fastener 140 for installing the vertical frame 120 or the shelf 110 of the serving cart 100.

A coupling hole 15 is formed along the central axis at the bottom of the body 14. The elastic member 155 of the driving wheel 150 is inserted into the coupling hole 15 to be coupled. The coupling hole 15 may be formed with a diameter in which the elastic member 155 can be smoothly fitted.

The coupling portion 12 may be formed on the top of the body 14 and be coupled to the vertical frame 120. The coupling portion 12 is formed to have a relatively smaller diameter than the body 14 to form a stepped portion with the body 14 and extend upward. Accordingly, the coupling part 12 may be fitted to the lower end of the vertical frame 120, or a fastener 140 for fixing the shelf 110 may be fitted outside the coupling part 12 to be combined. 4 illustrates a structure in which the fastener 140 is fitted and installed outside the coupling portion 12 of the vertical frame 120 and the connector 10. In addition to this structure, the connector 10 may be installed by fitting the coupling part 12 directly to the bottom of the vertical frame 120.

As shown in FIG. 4, a nut member 13 for coupling with the vertical frame 120 may be installed inside the hole formed through the center of the coupling part 12. The nut member 13 may be inserted and provided during injection molding of the connector 10. Accordingly, the coupling part 12 may be fastened and fixed to the fastening bolt 122 installed at the lower end of the vertical frame 120 through the nut member 13. Therefore, while the nut member 13 of the coupling portion 12 is fastened to the fastening bolt 122 of the vertical frame 120, the connector 10 can be firmly fixed to the bottom of the vertical frame 120.

The cover 16 is integrally formed under the body 14. The cover portion 16 is a portion whose diameter is relatively larger than that of the body 14 and may be formed to have a size such that it can cover the upper part of the bracket 153 of the driving wheel 150. The cover unit 16 may be variously deformed in shape or size of a structural surface capable of covering the upper part of the bracket 153 as a whole.

Accordingly, when the elastic member 155 of the driving wheel 150 is inserted into the coupling hole 15 of the connector 10, the lower end of the connector 10 is in close contact with the upper part of the bracket 153 of the driving wheel 150 (16) covers the bracket 153 as a whole. Accordingly, the upper portion of the bracket 153 is covered by the cover 16 and is not exposed to the outside.

The connector 10 covers and protects the upper bracket 153 of the driving wheel 150, thereby preventing damage to the bracket 153 from the outside. For example, water flowing down along the vertical frame 120 is discharged to the outside along the lid 16 under the connector 10 and does not flow into the bracket 153. In this way, the bracket 153 is covered by the cover portion 16 and protected without being exposed to the outside by the connector 10 of the present embodiment, so that rust or damage can be prevented.

The lower end of the connector 10, that is, the lower end of the cover portion 16 of the body 14 may be formed in a shape corresponding to the cross-sectional shape of the upper end of the bracket 153 to be in close contact with the upper end of the bracket 153.

As shown in FIG. 4, the connector 10 of this embodiment may have a recessed portion 17 recessed in an arc shape at the lower end corresponding to the upper end shape of the bracket 153.

As mentioned, the bracket 153 has an arc-shaped seating portion 159 protruding for seating of a bearing provided between the shaft member 152. In response to the seating portion 159 of the bracket 153, the recessed portion 17 is formed at the bottom of the cover portion 16, so that the lower end of the connector 10 may be more closely contacted with the upper end of the bracket 153. . Accordingly, the connector 10 is more rigidly coupled to the upper end of the bracket 153 to prevent the driving wheel 150 from shaking even when vibration or external force is applied. Accordingly, damage to the driving wheel 150 is minimized, and driving stability can be improved when used.

In a state in which the driving wheel 150 is mounted on the connector 10 of the present embodiment, the elastic member 155 may be elastically deformed from the outside of the connector 10 to be fixed. Thus, it is possible to more easily mount the driving wheel 150.

The driving wheel 150 is fixed by pressing in close contact with the inside of the coupling hole 15 of the connector 10 as the elastic member 155 is elastically deformed by an external force and the outer diameter is expanded. The elastic member 155 is inserted into the bolt shaft 154 and supported between the washer 156 and the tightening nut 157, and as the tightening nut 157 is rotated and tightened with respect to the bolt shaft 154, It is compressed and elastically deformed outward.

The tightening nut 157 moves together with the elastic member 155 in a state in which the elastic member 155 is pressed in close contact with the upper end. Accordingly, when the elastic member 155 is in close contact with the inner circumferential surface of the coupling hole 15 and does not move, the tightening nut 157 also does not move like the elastic member 155. The elastic member 155 is forcibly inserted into the coupling hole 15 of the connector 10 in a state in which the outer diameter is expanded to some extent by tightening the tightening nut 157 so that it can be in close contact with the coupling hole 15 of the connector 10. I can lose.

Therefore, when the bolt shaft 154 is rotated by rotating the bracket 153 from the outside of the connector 10 while the elastic member 155 is forcibly fitted into the connector 10, the coupling hole 15, the tightening nut 157 As the bolt shaft 154 is relatively rotated, the tightening nut 157 is tightened. That is, since the elastic member 155 is in close contact with the coupling hole 15, it is not rotated, and the tightening nut 157 is also in close contact with the elastic member 155 and is not rotated, and only the bolt shaft 154 is rotated. 157 is moved along the bolt shaft 154 to be tightened. Accordingly, the elastic member 155 is elastically deformed while being compressed in the vertical direction by the tightening nut 157. Therefore, as the elastic member 155 expands to the outside, it is firmly fixed and installed by pressing in close contact with the coupling hole 15 of the connector 10.

In this way, by rotating the bracket 153 while the driving wheel 150 is mounted on the connector 10, the elastic member 155 is deformed, so that the driving wheel 150 can be fixed.

The tightening nut 157 of this embodiment has a structure capable of being in close contact with the front end of the elastic member 155.

As shown in Figure 5, the tightening nut 157 of the present embodiment is formed extending outward from the lower end of the head 161 and the head 161 to form a flange portion 162 in close contact with the front end of the elastic member 155. Can include.

Accordingly, the tightening nut 157 is in close contact with the upper end of the elastic member 155 in a wider area by the flange portion 162 to be firmly fixed to each other. Therefore, the tightening nut 157 is firmly fixed to the elastic member 155 so that it can move as if it were the elastic member 155 and one body 14. Accordingly, when the bolt shaft 154 is rotated, the tightening nut 157 is not rotated, and the state in close contact with the upper end of the elastic member 155 can be maintained.

In addition, the present embodiment may further include a fixing part for preventing rotation of the tightening nut 157 when the bolt shaft 154 is rotated for mounting the driving wheel 150. By controlling the rotation of the tightening nut 157 more reliably through the fixing part, only the bolt shaft 154 can be rotated outside the connector 10. Accordingly, when the bolt shaft 154 is rotated, the tightening nut 157 is not rotated but is tightened or loosened to the bolt shaft 154 to elastically deform the elastic member 155.

As shown in FIG. 5, the fixing part may include at least one protrusion 20 protruding from the lower end of the tightening nut 157 and pressed against the distal end of the elastic member 155. A plurality of protrusions 20 may be formed to protrude at intervals along the circumferential direction at the lower end of the flange portion 162 of the tightening nut 157. The protrusion 20 may have a structure that sharply protrudes outward so that it can penetrate into the elastic member 155. The protrusion 20 may be formed to lie in a direction perpendicular to the rotational direction of the tightening note, that is, a circumferential direction. Accordingly, movement in the rotational direction between the elastic member 155 and the tightening nut 157 may be more regulated. The shape or number of protrusions 20 may be variously modified.

At least one or more grooves 22 configured to engage with the protrusion 20 may be formed at an upper end of the elastic member 155 in contact with the tightening nut 157. The groove portion 22 is formed in the upper end of the elastic member 155 is recessed. The groove 22 may be formed in a shape corresponding to the protrusion 20. Like the protrusion 20, the groove 22 may also extend in a direction perpendicular to the circumferential direction of the elastic member 155.

Thus, when the tightening nut 157 is in close contact with the upper end of the elastic member 155, the protrusion 20 is fixed more firmly while being caught in the groove 22 so that it can move like the elastic member 155. Therefore, when the bolt shaft 154 is rotated, the tightening nut 157 is not rotated more reliably, and is attached to the elastic member 155 to maintain a fixed state.

6 shows another embodiment for fixing a driving wheel.

In the embodiment shown in FIG. 6, except for the structure of the lower cover part of the connector and the fixing part for the tightening nut, the other components are the same as those previously described. Accordingly, the same reference numerals are used for the configurations already described, and detailed descriptions thereof are omitted.

As shown in Fig. 6, the connector 10 of this embodiment has a structure in which the cover part 30 at the lower end sufficiently covers the upper end of the bracket 153 to the inside. The concave portion 32 formed at the bottom of the cover portion 30 is also formed to cover the seating portion 159 formed in the bracket 159 as a whole. Accordingly, the contact area between the connector 10 and the bracket 153 is further increased, so that the bonding force between the two can be increased.

Therefore, the driving wheel 150 is more tightly fixed to the connector 10 to prevent damage to the driving wheel 150 due to external shock or vibration during the use process, and improve driving stability.

The fixing part of the present embodiment is formed at the inner upper end of the coupling hole 15 of the connector 10 and includes an end 40 in contact with the tightening nut 157 to regulate the rotation of the tightening nut 157. The end 40 is, for example, when the elastic member 155 of the driving wheel 150 is inserted into the coupling hole 15 of the connector 10, so that the tightening nut 157 can contact the connector 10 It may mean a thickly formed part. Rotation may be restricted by frictional force while the tightening nut 157 is in contact with the end 40. Accordingly, when the bolt shaft 154 rotates, the tightening nut 157 in contact with the end portion 40 is limited in rotation and only the bolt shaft 154 can be rotated.

In addition, the fixing portion may include a fitting groove 42 formed in a shape corresponding to the head portion 161 of the tightening nut 157 so as to be fitted and coupled to the head portion 161. The fitting groove 42 may be formed on the inner upper end of the coupling hole 15 of the connector 10. When the driving wheel 150 and the elastic member 155 are completely inserted into the connector 10 and the coupling hole 15, the fitting groove 42 is formed at a position corresponding to the tightening nut 157, the head 161, and the head It can be engaged with the part 161.

The fitting groove 42 may be formed as a hexagonal groove, for example, corresponding to the hexagonal head 161 of the tightening nut 157. Accordingly, rotation of the tightening nut 157 is regulated by fitting the head 161 into the fitting groove 42.

Accordingly, when the driving wheel 150 is inserted into the connector 10, the head 161 of the tightening nut 157 is engaged with the fitting groove 42, and rotation of the tightening nut 157 is prevented. By rotating only the bolt shaft 154 while the tightening nut 157 is reliably restricted in rotation, the tightening nut 157 can be tightened to elastically deform the elastic member 155.

As described above, in this embodiment, by rotating the bracket 153 from the outside of the connector 10 in a state in which the driving wheel 150 is mounted on the connector 10, the elastic member 155 of the driving wheel 150 is simply It is possible to pressurize close contact with the connector 10.

Although the exemplary embodiments of the present invention have been shown and described as described above, various modifications and other embodiments may be made by those skilled in the art. These modifications and other embodiments are all considered and included in the appended claims and will not depart from the true spirit and scope of the present invention.

10: connector 12: coupling portion
14: body 15: coupling hole
16,30: cover 17,32: recess
20: protrusion 22: groove
40: end 42: fitting groove
100: serving cart 110: shelf
120: vertical frame 122: fastening bolt
140: fastener 150: driving wheel
153: bracket 154: bolt shaft
155: elastic member 157: tightening nut
160: ranch part 161: head
162: flange portion

Claims (8)

It is installed at the bottom of the vertical frame of the moving structure to fix the driving wheel and includes a connector to cover and protect the bracket of the driving wheel,
The driving wheel includes a driving wheel, a shaft member supporting the rotating shaft of the driving wheel, a bracket rotatably installed on the shaft member, a bolt shaft extending perpendicularly to the bracket, and an elastic member fitted to the bolt shaft. , A washer fitted to the bolt shaft to support and support the lower end of the elastic member, and a tightening nut screwed to the bolt shaft to pressurize the elastic member to elastically deform,
The connector is formed on the upper end, a coupling portion coupled to the vertical frame of the moving structure, a body integrally formed under the coupling portion, and having a coupling hole through which an elastic member of the driving wheel is inserted and coupled therein, and at the bottom of the body It is formed and extends to the outer circumference of the bracket of the driving wheel and includes a cover portion covering the upper bracket
Further comprising a fixing portion for preventing the rotation of the tightening nut when the bolt shaft rotates,
The fixing part is a driving wheel fixing device comprising at least one protrusion protruding from the lower end of the tightening nut and pressing the front end of the elastic member. The method of claim 1,
The lower end of the connector is formed in a shape corresponding to the cross-sectional shape of the upper end of the bracket, the driving wheel fixing device in close contact with the upper end of the bracket. The method of claim 2,
The bracket is rotatably installed on the shaft member via a bearing, and the bracket is formed with an arc-shaped seating portion on which the bearing is seated protrudes upward, and the connector is formed in the protruding seating groove of the bracket at the bottom of the cover portion. A driving wheel fixing device in which concave portions recessed in a corresponding arc shape are formed. The method of claim 1,
The tightening nut includes a head portion and a flange portion extending outwardly from the lower end of the head portion to be in close contact with the upper end of the elastic member, and having a structure that moves in close contact with the elastic member by the flange portion to move like the elastic member. Driving wheel fixing device. delete The method of claim 1,
The fixing unit further comprises at least one groove portion formed on the front end of the elastic member so as to be engaged with the protrusion. It is installed at the bottom of the vertical frame of the moving structure to fix the driving wheel and includes a connector to cover and protect the bracket of the driving wheel,
The driving wheel includes a driving wheel, a shaft member supporting the rotating shaft of the driving wheel, a bracket rotatably installed on the shaft member, a bolt shaft extending perpendicularly to the bracket, and an elastic member fitted to the bolt shaft. , A washer fitted to the bolt shaft to support and support a lower end of the elastic member, and a tightening nut screwed to the bolt shaft to pressurize the elastic member to elastically deform,
The connector is formed on the upper end, a coupling portion coupled to the vertical frame of the moving structure, a body integrally formed under the coupling portion, and having a coupling hole through which an elastic member of the driving wheel is inserted and coupled therein, and at the bottom of the body It is formed and extends to the outer circumference of the bracket of the driving wheel and includes a cover portion covering the upper bracket,
Further comprising a fixing portion for preventing the rotation of the tightening nut when the bolt shaft rotates,
The fixing unit is formed in a shape corresponding to the head of the tightening nut on the inner upper end of the coupling hole of the connector, and includes a fitting groove to which the head is fitted and coupled. A plurality of vertical frames, fasteners installed in the vertical frame, shelves connected between the fasteners and disposed horizontally between the vertical frames, driving wheels coupled to the bottom of the vertical frame, and installed at the bottom of the vertical frame for driving And a connector for fixing the wheel and covering and protecting the bracket of the driving wheel,
The driving wheel includes a driving wheel, a shaft member supporting the rotating shaft of the driving wheel, a bracket rotatably installed on the shaft member, a bolt shaft extending perpendicularly to the bracket, and an elastic member fitted to the bolt shaft. , A washer fitted to the bolt shaft to support and support a lower end of the elastic member, and a tightening nut screwed to the bolt shaft to pressurize the elastic member to elastically deform,
The connector is formed on the upper end, a coupling portion coupled to the vertical frame of the moving structure, a body integrally formed under the coupling portion, and having a coupling hole through which an elastic member of the driving wheel is inserted and coupled therein, and at the bottom of the body It is formed and extends to the outer circumference of the bracket of the driving wheel and includes a cover portion covering an upper portion of the bracket, and a fixing portion preventing rotation of the tightening nut when rotating the bolt shaft,
The fixing portion is formed in a shape corresponding to the head of the tightening nut on the inner upper end of the coupling hole of the connector, the serving cart including a fitting groove to which the head is inserted and coupled.

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