KR20220087760A - A cart - Google Patents

Abstract

The present invention relates to a cart capable of manipulating the moving direction with left and right operation levers (311,310) and first and second cables (320,330). The left and right wheels of the cart are connected to each other by a link 240 . The straightness of the cart is restored by any one of the left and right return springs 260 and 270 and the left and right compression springs 316 . According to the present invention as described above, the direction change of the cart is made easily even with a small force, the accuracy of the operation is increased, and the direction change of the cart is made quickly.

Description

cart{A cart}

The present invention relates to a cart, and more particularly, to a cart equipped with a steering device and capable of manually operating the moving direction.

A cart is a cart that can carry goods. In general, large marts or daily necessities stores are equipped with carts for the convenience of consumers.

Carts described in the prior art documents below are equipped with a steering device to enable manual direction change. The moving direction is controlled by the cable connecting the control lever and the wheel.

However, in the carts of the prior art literature, the restoration device to have straightness again after changing the direction operates unstable, so when the wheel regains the front direction, it is inconvenient to use. There is a problem that it cannot operate and the operation is delayed, and the working distance of the lever is also increased.

In addition, when the lever is operated, one wheel rotates in the moving direction but the other wheel rotates 360°, so there is a problem that the wheel to which no operating force is applied actually acts as a brake, preventing the cart from changing direction.

Republic of Korea Patent No. 1138202 (cart with direction change device installed, published on June 16, 2011) Republic of Korea Patent No. 0994281 (Manual direction control transfer device, 2010.11.12. Announcement)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cart capable of changing direction without applying a large force, recovering straightness well, and reducing motion delay.

Another object of the present invention is to provide a steering device that can be mounted without changing the shape of the existing cart.

Another object of the present invention is to provide a cart configured so that the front wheels are lifted from the floor when a plurality of carts are stacked and moved.

According to a feature of the present invention for achieving the above object, the present invention provides a main body having a loading space and a handle, a driving unit that supports the main body and is movable by at least two wheels, and a steering device for controlling the movement direction of the main body wherein the steering device includes a left lever provided on the left side of the handle, a right lever provided on the right side of the handle, a first cable connecting the right lever and a front end of a front left wheel holder of the driving unit, the left side A second cable connecting the lever and the front end of the right wheel holder of the front wheel of the driving unit, a link connecting the right wheel holder and the left wheel holder to each other, installed at the rear of the link and moving the rear end of the right wheel holder toward the center of the body It includes a right return spring for pulling, a left return spring installed at the rear of the link and pulling the rear end of the left wheel holder toward the center of the main body, and when the left lever is pulled, it turns left, and when the right lever is pulled, it turns right and by the link The front wheels are interlocked with each other.

A left lever restoring device allowing the linear movement of the left lever and providing a restoring force at the same time, and a right lever restoring device allowing the linear movement of the right lever and providing a restoring force at the same time are further included, the left lever restoring device and the right lever restoring device The device is installed on the handle and is characterized in that it has a linear bushing and a compression spring, respectively.

A cable receiving unit for covering the first and second cables is further included in some sections of the first and second cables.

A roller is installed at a position where the first and second cables are bent.

A lifting guide member for lifting the front wheel away from the floor is installed to protrude from the bottom of the loading space.

According to the present invention, the direction change of the cart is made easily even with a small force, the accuracy of the operation is increased, and the direction change of the cart is made quickly. In addition, it is economical because the steering system can be applied without applying a large deformation to the existing cart.

According to the present invention, the front wheels are interlocked and the rectilinearity recovery is assured by the restoring force of the return spring, and thus the durability of the device is improved.

1 is a perspective view showing an overall appearance as an embodiment of the present invention.
Figure 2 is a plan view schematically showing the configuration of the steering device in the embodiment of the present invention.
Figure 3 is an exploded perspective view showing an enlarged area A of Figure 1;
4 is an operation state diagram when proceeding in the left direction.
5 is an operation state diagram when proceeding in the right direction;
Figure 6 is a perspective view showing a state that the lifting guide member is installed on the cart.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a cart according to an embodiment of the present invention in a perspective view, FIG. 2 schematically shows only the configuration of a steering device installed on the cart (shown of the cart is omitted), and FIG. 3 is a view A of FIG. The configuration of the region is shown in an exploded perspective view.

The cart includes a main body 100 having a loading space 120 , a driving unit 200 that supports the main body 100 and is movable, and a steering device 300 that adjusts the moving direction of the main body 100 .

The loading space 120 of the main body 100 is partially opened so that the user can contain the items that need to be transported. According to the shape of the loading space 120, it is divided into a stroller, a shopping cart, and the like. Cable receiving parts 125 extending in the vertical direction are provided on both sides of the rear of the loading space 120 in this embodiment. The cables 320 and 330, which will be described later, pass through the cable receiving unit 125 so that the cables 320 and 330 do not interfere with objects contained in the loading space 120 .

A handle 130 is provided at the rear upper portion of the main body 100 so that a user can apply an operating force to the main body 100 . A right lever 310 is further installed on the right side of the handle 130 , and a left lever 311 is further installed on the left side of the handle 130 . One end of a first cable 320 to be described later and a right lever restoring device 312 ′ are connected to the right lever 310 . One end of the second cable 330 to be described later and the left lever restoring device 312 are also connected to the left lever 311 .

The driving unit 200 includes a support frame 201 for supporting the main body 100 and a wheel assembly (without reference numeral) coupled to an end of the support frame 201 . In the present embodiment, the driving unit 200 has two front wheels and two rear wheels, a total of four wheel assemblies, which are operated by the left and right levers 311 and 310 are wheel assemblies of the front wheels.

The left wheel assembly includes a left wheel 210 and a left wheel holder 215 for accommodating the left wheel 210 to rotate. The left wheel holder 215 is coupled to the end of the support frame 201 and is rotatable 360° using the wheel holder shaft 216 as a rotation axis. Likewise, the right wheel assembly includes a right wheel 230 and a right wheel holder 235 for accommodating the right wheel 230 to rotate. The right wheel holder 235 is coupled to the end of the support frame 201 and is rotatable 360° using the wheel holder shaft 236 as a rotation axis.

On the other hand, the connecting bar 250 connects the left and right sides of the support frame 201 . A fixing part 258 for holding one end of the return springs 260 and 270 to be described later is installed in the center of the connecting bar 250 .

Subsequently, one end of the first and second cables 320 and 330 cross each other in an X-shape and are connected to the left wheel holder 215 and the right wheel holder 235, which are front wheels. The other ends of the first and second cables 320 and 330 are connected to the left and right levers 311 and 310, respectively. Therefore, the direction change of the cart can be adjusted by controlling the rotation of the left wheel holder 215 and the right wheel holder 235 by operating the left and right levers 311 and 310 .

The configurations of the steering device 300 will be described in detail.

1 and 2, the steering device 300 includes left and right levers 311 and 310 installed on both sides of the cart handle 130, and a lever restoring device for restoring the position of the left and right levers 311 and 310 (312, 312'), First and second cables 320 and 330 that cross and connect the left and right levers 311 and 310 and the left and right wheel holders 215 and 235 in an X-shape, a link 240 that connects the left and right wheel holders 215 and 235 with each other, the connecting bar A left return spring 260 connecting the fixing portion 258 of the 250 and the left wheel holder 215, and a right return connecting the fixing portion 258 of the connecting bar 250 and the right wheel holder 235 It includes a spring 270 .

Referring to FIG. 2 , the lever restoration devices 312 and 312 ′ are devices that help the left and right levers 311 and 310 linearly move, and a linear bushing 314 through which a lever shaft extending orthogonally from the left and right levers 311 and 310 passes through, and the left and right and a compression spring 316 disposed between the levers 311 and 310 and the linear bushing 314 to provide restoring force to the left and right levers 311 and 310 .

Rollers 390 are installed at positions where the first and second cables 320 and 330 are bent. In addition, it is preferable that the cable accommodating part 125 be installed in some sections of the first and second cables 320 and 330 , particularly in a position where interference with objects stored in the loading space 120 may occur.

Hereinafter, the connection structure of the left return spring 260 and the left wheel holder 215 will be described with reference to FIG. 3 . In FIG. 1, it is indicated by area A.

First, the fastening boss 262 is connected to the left wheel holder 215 and is located at the rear side of the link 240 . The fastening boss 262 is installed in the left wheel holder 215 in a rotatable state by the bearing 261 . A locking portion 263 having a hole formed thereon protrudes from the upper portion of the fastening boss 262 . The left return spring 260 passes through the hole of the locking part 263 , and a washer 264 that prevents the left return spring 260 from falling out of the hole of the locking part 263 is installed at the end of the left return spring 260 . are combined

One end of the left return spring 260 is fixed to the fixing portion 258 of the connecting bar 250 , and the other end of the left return spring 260 passes through the hole of the locking portion 263 . Accordingly, when the left wheel holder 215 rotates counterclockwise, the locking part 263 may move toward the fixing part 258 (see FIG. 4 ). Conversely, when the left wheel holder 215 rotates clockwise as shown in FIG. 5 , this time the locking part 263 moves in a direction away from the fixing part 258, and at this time, the washer 264 moves the locking part ( 263), the left return spring 260 is extended and a restoring force is generated so that the left wheel holder 215 is directed in the straight direction.

Since the connection structure of the right return spring 270 and the right wheel holder 235 is the same as that of the left, a description thereof will be omitted.

Next, a process for installing the steering device 300 on the cart will be described.

The steering device 300 has a structure that can be installed in the cart without significantly applying deformation to the existing cart. The left lever restoring device 312 is fixed to the left side of the handle 130 , and the right lever restoring device 312 ′ is fixed to the right side of the handle 130 , respectively. After passing the first cable 320 extending from the right lever 310 to the right side of the cart body 100, connect it to the right side of the connecting bar 250 with a roller, and connect the end of the first cable 320 to the left It is fixed to the tip of the wheel holder (215).

In the same way, the second cable 330 extending from the left lever 311 is passed through the left side of the cart body 100 , and then connected to the left side of the connecting bar 250 with a roller and the second cable 330 is The end is fixed to the front end of the right wheel holder (235). A roller may be further installed at a position where the first and second cables 320 and 330 are bent. In addition, some sections of the first and second cables 320 and 330 may be covered by the cable receiving unit 125 .

Next, the left end of the link 240 is connected directly behind the wheel rotation shaft 216 of the left wheel holder 215 . The right end of the link 240 is connected to the rear of the wheel rotation shaft 236 of the right wheel holder 235 .

Finally, one end of the left return spring 260 is fixed to the fixing part 258 , and the other end is fastened to the fastening boss 262 in the configuration of FIG. 3 , and the fastening boss 262 is the back of the link 240 . A bearing 261 is placed on the pole and connected to the left wheel holder 215 .

One end of the right return spring 270 is fixed to the fixing part 258 , and the other end is fastened to the fastening boss 262 in the configuration of FIG. 3 , and the fastening boss 262 is a bearing on the back of the link 240 . (261) is placed and connected to the right wheel holder (235).

According to the cart according to the embodiment of the present invention, since the front wheels are connected by a link, when the carts are rotated by overlapping a plurality of carts, the front wheels each act as a brake to inhibit straightness. Therefore, it is necessary to temporarily block the front wheel movement method during the cart collection operation.

A device was added that lifts the front wheels of the cart when the carts overlap to prevent front wheel movement. That is, as shown in FIG. 6 , a lifting guide member 500 was installed on the front bottom surface of the cart body 100 . The lifting guide member 500 has a structure protruding a predetermined height downward of the cart body 100 .

When the cart body 100 is inserted toward the front from the rear of the other cart body, the front wheel of the cart body 100 is lifted because there is a lifting guide member 500 of the cart body 100 . Then, multiple carts in the nested state will move only with the rear wheels.

Hereinafter, a method and operation of a card according to an embodiment of the present invention will be described. 2 is a plan view showing a state when the cart moves straight. 4 shows an operation when the cart rotates left, and FIG. 5 shows an operation when the cart rotates right.

To make a left turn in the straight forward state of FIG. 2 , the left lever 311 is pulled as shown in FIG. 4 . When the left lever 311 is pulled, the second cable 330 is pulled so that the front of the right wheel holder 235 rotates to the left. At this time, since the link 240 is connected, the front side of the left wheel holder 215 rotates to the left. On the other hand, since the rear of the right wheel holder 235 moves away from the fixing part 258, the right return spring 270 is extended. At the same time, the rear of the left wheel holder 215 and the fastening boss 262 move along the left return spring 260 to the closer to the fixing part 258, so that the fastening boss 262 and the left return spring 260 are connected to the left wheel. It does not interfere with the rotation of the holder 215 . Meanwhile, as the left wheel holder 215 rotates to the left, the left wheel holder 215 pulls the first cable 320 so that the right lever 310 moves forward while compressing the right compression spring 316 .

When the left lever 311 is released in this state, the cart moves straight again by the restoring force of the left compression spring 316 in the extended state, the right return spring 270 in the stretched state, and the right compression spring 316 in the compressed state. will be placed in a state

The state and operation in which the cart rotates to the right of FIG. 5 differs from the state and operation and the direction in which the cart rotates to the left, and thus the rest of the operation is the same, so a detailed description will be omitted.

The scope of the present invention is not limited to the embodiments described above, but is defined by the claims, and a person of ordinary skill in the art may make various modifications and adaptations within the scope of the claims. It is self-evident that it can

100: body 120: loading space
130: handle 200: driving unit
201: support frame 210: left wheel
215: left wheel holder 230: right wheel
235: right wheel holder 236: wheel holder shaft
240: link 250: connecting bar
258: fixed portion 260: left restoration spring
270: right restoration spring 300: steering device
310: right lever 311: left lever
312, 312': left and right lever restoration device 320: first cable
330: second cable 500: lifting guide member

Claims (5)

The body 100 having a loading space 120 and a handle 130,
A driving unit 200 that supports the main body 100 and is movable with at least two wheels,
and a steering device 300 for controlling the moving direction of the main body 100,
The steering device 300 includes a left lever 311 provided on the left side of the handle 130 , a right lever 310 provided on the right side of the handle 130 , the right lever 310 , and the driving unit 200 . ) a first cable 320 connecting the front end of the left wheel holder 215 of the front wheel, and a second cable connecting the end of the left lever 311 and the front right wheel holder 235 of the driving unit 200 ( 330), a link 240 connecting the right wheel holder 235 and the left wheel holder 215 to each other, installed at the rear of the link 240 and attaching the rear end of the right wheel holder 235 to the main body 100 It includes a right return spring 270 that pulls toward the center of the left return spring 260, which is installed at the rear of the link 240 and pulls the rear end of the left wheel holder 215 toward the center of the body 100, and ,
When the left lever (311) is pulled, it rotates left, and when the right lever (310) is pulled, it turns right, and the front wheel is linked by the link (240). According to claim 1, wherein the left lever restoration device (312) that allows the linear movement of the left lever (311) and provides a restoring force at the same time, and the right lever restoration that allows the linear movement of the right lever (310) and provides a restoring force at the same time. A device 312' is further included,
The left lever restoring device (312) and the right lever restoring device (312') are installed on the handle (130) and have a linear bushing (314) and a compression spring (316), respectively. According to claim 2, wherein a portion of the first and second cables (320, 330) the first and second cables (320, 330) a cable receiving portion (125) for covering the cart further included. The cart according to claim 3, wherein rollers are installed at positions where the first and second cables (320,330) are bent. [Claim 5] The cart according to any one of claims 1 to 4, wherein a lifting guide member (500) for lifting the front wheel away from the floor is installed to protrude from the bottom of the loading space (120).

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