KR20170055761A - A cart having caster wheel - Google Patents

A cart having caster wheel Download PDF

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Publication number
KR20170055761A
KR20170055761A KR1020150158938A KR20150158938A KR20170055761A KR 20170055761 A KR20170055761 A KR 20170055761A KR 1020150158938 A KR1020150158938 A KR 1020150158938A KR 20150158938 A KR20150158938 A KR 20150158938A KR 20170055761 A KR20170055761 A KR 20170055761A
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KR
South Korea
Prior art keywords
frame
center shaft
caster
cart
rotation center
Prior art date
Application number
KR1020150158938A
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Korean (ko)
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KR101743363B1 (en
Inventor
민경균
Original Assignee
(주)머케인
민경균
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Application filed by (주)머케인, 민경균 filed Critical (주)머케인
Priority to KR1020150158938A priority Critical patent/KR101743363B1/en
Publication of KR20170055761A publication Critical patent/KR20170055761A/en
Application granted granted Critical
Publication of KR101743363B1 publication Critical patent/KR101743363B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B2301/00—Wheel arrangements; Steering; Stability; Wheel suspension
    • B62B2301/04—Wheel arrangements; Steering; Stability; Wheel suspension comprising a wheel pivotable about a substantially vertical axis, e.g. swivelling castors

Abstract

The purpose of the present invention is to provide a cart capable of switching a direction with very little power. The cart of the present invention comprises: a frame (12) capable of supporting objects; and front casters (20) installed on the underside of the frame and composed of a rotary center shaft (24), a caster bracket (22) supported to be able to rotate around the rotary center shaft, and a caster wheel (28) which drives on the ground, and supported to be able to rotate by the caster bracket. A slot (14) is formed in the front caster (20). The rotary shaft (24) is installed to be able to move a predetermined distance in a longitudinal direction inside the slot (14). Springs (40A, 40B) are installed in front and rear sides of the rotary center shaft (24), thereby making the rotary center shaft (24) return to its initial position. If an external force for switching a direction is applied, the rotary center shaft (24) moving in a front side of the caster wheel (28) is moved toward a direction where the slot (14) is desired to rotate in advance than the caster wheel (28) while the rotary center shaft (24) moves inside the slot (14). Accordingly, a slip is prevented maximally and less power is needed when the cart switches a direction.

Description

A cart having caster wheel < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cart having a caster, and more particularly to a cart having a caster configured to be smoothly rotated even when a heavy load is loaded.

As shown in FIG. 1, a cart is mounted on a bottom surface of a frame 4 in a state where a plurality of objects are placed on the frame 4, and is moved using a plurality of casters 2 rolling on the ground surface Device. Such carts are being used in various forms, such as carrying out moving objects such as parts in an industrial field, as well as being used by ordinary consumers in shopping at a large shopping mall. In addition to this, a stroller and the like can be said to be substantially the same concept as a cart.

As described above, the frame 4 can be supported in a state in which the object is placed on the ground, and the caster 2 performs rolling contact with the ground so as to allow the frame 4 to travel. The casters (2) are often used for such carts. The caster 2 includes a caster bracket 2a that rotates in the horizontal direction around a rotary shaft 8 connected to the frame 4 and a caster bracket 2a that is coupled to the caster bracket 2a (2b).

Here, the caster bracket 2a has a tilted inclination angle, which is called a caster angle. The presence of such a caster angle means that there is a certain distance from the center of the rotating shaft 8 and the center of the caster wheel 2b (that is, the center of the portion in contact with the ground) This distance is called a caster offset. The use of the casters 2 in this manner can be said to be because the straight running can be secured by preventing the shimmy phenomenon and the straight running function can be recovered more easily when the rotation is completed.

In general, a cart having a widely used caster wheel can be referred to as a manual cart. In a cart having such a caster wheel, straight forward is not a big difficulty in any case, but it is pointed out that it is inconvenient when it rotates. In other words, in the straight-ahead state, there is no problem that all the caster wheels 2b will roll because of the rolling motion with respect to the ground. However, when the cart is rotated leftward or rightward, the slip substantially occurs, so that a greater force is required compared to the straight running.

Referring to FIG. 2, the cart is provided with a front wheel 2bf and a rear wheel 2br which are spaced at regular intervals. Considering the case where the cart is rotated rightward in the C direction by using a handle provided on the upper portion of the rear wheel 2br, this direction component is referred to as a straight direction component Y ) And a transverse component (X) having a right angle with the immediately preceding component.

Here, the front wheel 2bf is allowed to perform rolling motion with respect to the ground by a distance corresponding to the straight component corresponding to the right rotation direction, but it corresponds to the lateral component X corresponding to the right rotation direction The movement of the subject is caused by the slip. This slip will occur in the range of the contact area 2c in contact with the ground at the front wheel 2bf. Since the aforementioned slip in the manual cart is substantially generated by the user's force, It is said that it enters more.

In this case, the user who uses the cart operates by holding the handle 6 provided on the upper portion of the rear wheel 2br, so that the slip generated in the rear wheel is not a big problem. However, it is apparent that the slip generated in the front wheel 2bf having the inter-shaft distance Ds, which is a considerable distance between the rear wheel 2br and the rear wheel 2b, actually acts as a burden on the user. It can be seen that the burden of the force felt by the user during the steering operation is significantly greater in the inter-shaft distance Ds than the wheel distance Dw of the cart.

That is, in order to rotate the cart, the force of the user must act on the handle 6, and then, through the frame 4, push the direction of rotation of the rotary shaft 8. Here, the rotary shaft 8 is located forward of the length of the caster offset than the front wheel 2bf, and thus the front wheel 2bf is slip-free. The slip thus generated is to be made by the force of the user able to overcome the frictional force between the front wheel 2bf and the ground, so that the user becomes more forceful.

Further, it is relatively easy to apply a force required for such rotation to the rotary shaft 8, but it can not be applied to the handle 6 located rearward by the distance Ds. That is to say, a force must be applied to the rotary shaft 8 in the lateral direction component X. This is because the force exerted on the rotary shaft 8 is directly applied to the rotary shaft 8 by using the handle 6 located rearward by the inter- It is more difficult to apply force to the rotary shaft 8. In this manner, the force required to change the direction of the rotary shaft 8 for the rotation of the cart becomes larger in proportion to the inter-shaft distance Ds. In this specification, the front wheel 2bf means a caster wheel installed in front of the cart, and the rear wheel 2br means a caster wheel installed in the rear.

In order to make the manual cart as described above a motorized cart using a motor, it is sufficient to incorporate a hub motor in the above-described pair of rear wheels 2br. However, even if the hub motor is built in this way, the disadvantage of requiring a larger force in steering as described above can not be solved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cart which can be easily rotated even under a heavy load.

According to an aspect of the present invention, there is provided a cart including: a frame capable of supporting an object; A front caser provided on a bottom surface of the frame, the front casters being composed of a rotation center shaft, a caster bracket rotatably supported by the rotation center shaft, and a caster wheel rotatably supported by the caster bracket and running on the ground; Supporting means for supporting the rotational center axis of the front casters so as to be movable in the front-rear direction with respect to the frame at regular intervals; And return means for returning the rotation center shaft supported by the support means to a predetermined position.

A cart of another embodiment includes: a frame capable of supporting an object; A front caser provided on a bottom surface of the frame, the front casters being composed of a rotation center shaft, a caster bracket rotatably supported by the rotation center shaft, and a caster wheel rotatably supported by the caster bracket and running on the ground; Supporting means for supporting the rotational center axis of the front casters so as to be movable rearward relative to the frame at regular intervals; And a returning means for returning the rotation center shaft supported by the supporting means to a predetermined position.

The supporting means in the present invention may be constituted by a slot or a longitudinal groove formed in the forward and backward direction in front of the frame so that a rotation center shaft supported at a constant height with respect to the frame can be inserted.

The returning means in the present invention may be constituted by a forward spring and a rearward spring provided in front of and behind the rotational center axis in the slot or the longitudinal groove. Or the returning means may be constituted by a spring provided only on the rear side of the rotation center shaft. It is preferable that the front casters of the cart according to the present invention are constituted by a pair.

According to the present invention having the above-described configuration, it is possible to expect an advantage in that it is very convenient to change a direction such as a left turn or a right turn even when a heavy object is loaded. Since the cart of the present invention requires a very small force when turning, it will be advantageous that the ease of use can be significantly improved when applied to a manual cart. When the present invention is applied to a motorized cart using a driving motor, even if a motor having a smaller force is used, it is possible to have an advantage that the motor does not incur any difficulty in changing direction.

According to the present invention, it is also possible to expect that the impact applied to the front casters can be absorbed to a certain level by the spring. Also, according to the present invention, it is expected that the caster in the rear of the vehicle can perform the rolling motion even in the process of compression of the spring, so that the cart itself stops immediately due to the obstacle or the inconvenience at the time of restarting due to the obstacle.

1 is an exemplary perspective view showing one of a conventional cart;
Fig. 2 is an explanatory view for explaining a caster wheel of a conventional cart and resistance during traveling. Fig.
3 is an exemplary perspective view of the cart of the present invention.
4 is a cross-sectional exemplary view of the cart according to the present invention.
5 is an explanatory view for explaining the operation of the cart in rotation according to the present invention;

Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. The cart of the present invention comprises a frame 12 on which an object can be placed and a plurality of casters 20 that travel while supporting the frame 12 against the ground. Here, the frame 12 is formed so as to be able to load a moving object, and has a function as a basic base in the cart of the present invention.

The frame 12 is provided with a plurality of casters 20 so that it can run in a rolling contact with the ground. The caster 20 is composed of a caster bracket 22 and a caster wheel 28 rotatably supported on a wheel rotation shaft 26 in a horizontal direction provided in the caster bracket 22. Here, the caster bracket 22 is rotatably installed with respect to a vertically installed rotation center shaft 24, which means that the caster bracket 22 is rotatable about a vertical axis (rotation support shaft) with respect to the horizontal plane .

And the caster wheel 28 is connected to the caster bracket 22 through the support shaft 26. [ In the present invention, since the caster bracket 22 has a constant inclination (a caster angle), there is substantially a gap between the rotation center shaft 24 and the wheel rotation shaft 26, that is, a caster offset. That is, assuming that the cart is traveling straight, the rotation center axis 24 precedes the wheel rotation axis 26 by the caster offset. Here, the configuration of such a caster 20 itself is substantially the same as the general one.

According to the present invention, the rotation center shaft 24 rotatably supports the caster bracket 22 and is supported so as to be movable at a predetermined interval in the running direction with respect to the frame 12. Further, the rotation center shaft 24 is configured to return to a predetermined position with respect to the frame 12 (position in forward and backward directions). That is, according to the present invention, the rotary shaft 24, which rotatably supports the caster 20 on the horizontal plane with respect to the frame 12, can move back and forth in the front and rear direction at certain intervals and return to the predetermined position It is resiliently supported.

3 and 4, a frame 14 having a predetermined length is formed in the frame 12 at a position corresponding to the front caster 20, have. And a rotation center shaft 24 which rotatably supports the caster bracket 22 is installed inside the slot 14 so that the rotation center axis 24 is substantially located inside the slot 14 , And can be said to be installed so as to be movable in a certain range in the forward and backward directions.

And the rotation center shaft 24 supported in the slot 14 is supported by a spring 40. [ A forward spring 40A is provided in the slot 14 corresponding to the front of the rotation center shaft 24. A forward spring 40A is provided on the inner periphery of the slot 14 corresponding to the rear of the rotation center shaft 24. [ 40B are provided. Therefore, it can be seen that the rotation center shaft 24 is supported by the springs 40 in all the front and rear directions.

As described above, according to the embodiment shown in FIGS. 3 and 4, the slot 14 can be a means for allowing the rotation center shaft 24 to move in a forward and backward direction within a certain range . And the spring 40 has a meaning as means for returning the rotation center shaft 24 moved backward or forward by the external force back to the original position inside the slot 14. [

Also in the illustrated embodiment, it is natural that the rotation center shaft 24 should be able to be supported at a predetermined height with respect to the frame 12. [ That is, the turning center shaft 24 must be able to be supported at a certain height with respect to the frame 12 so that it can be rotatably supported with respect to the caster bracket 22, and between the caster bracket 22 and the frame 12 It is a matter of course that friction or interference due to any contact should not occur. In the substantially illustrated embodiment, the configuration in which the rotation center shaft 24 is supported at a constant height with respect to the frame 12 is omitted.

The configuration in which the rotation center shaft 24 is directly or indirectly supported at a constant height with respect to the frame 12 is a matter of course for a person skilled in the art. For example, when a support protruding portion capable of contacting the bottom surface of the frame 12 is formed at an intermediate portion of the rotation center shaft 24 and a roller is provided on the support protruding portion, the rotation center shaft 24 is supported by the frame 12 ) At a predetermined height. Needless to say, any structure known in the art can be used for the structure in which the rotation center shaft 24 is supported on the frame at a predetermined height.

The front casters 20 can be moved forward or rearward within a certain range within the slots 14 as in the case of the rotation center shaft 24 inserted into the slots 14 And it is possible to move within the range of the slot 14 by, for example, external force of some form.

The present invention does not set any limitations or conditions for the rear casters 30 substantially. It is of course possible to use wheels having a caster offset or other types of wheels. In addition, the structure of the present invention may be implemented in a manual cart that is substantially pushed by the user while holding it by hand, and may be applied to a motorized cart using a motor. For example, if a pair of rear casters 30 is implemented by a wheel incorporating a hub motor, an electric cart capable of advancing, reversing, and cornering will be realized, and application of the structure of the present invention to such an electric cart It is possible.

Hereinafter, the operation of the cart of the present invention will be described. It can be said that the straight running performance of the cart of the present invention is similar to that of the conventional cart. However, since the rotation center shaft 24, to which the caster bracket 22 is rotatably supported, can move within a predetermined range in the forward and backward directions, the shock absorbing effect on the external force received in the running direction is smaller than that in the straight traveling of the conventional cart It will be appreciated that it can be said to be a remarkable action effect.

Fig. 5 shows an example of the case where the cart of the present invention rotates to the right. In order to explain the superiority of the cart's rotating action of the present invention, rotation under the extreme conditions is shown. In other words, Fig. 5 shows a state in which the center C between the pair of rear casters 30 is used as a reference to turn right by 90 degrees.

Before describing the operation of the cart according to the present invention, considering the direction of rotation in the conventional cart, rotating the pair of rear caster 30 substantially at the center C will cause a slight slip However, it is possible with a relatively small force. As shown in FIG. 5, however, the pair of casters 20, which are installed substantially in front, are moved along a large arc. At this time, a large force that can overcome the frictional force slips the casters 20 do.

However, according to the present invention, it is possible to achieve a smooth transition as follows. The principle of the present invention is briefly described. The force required for rotating the front caster 20 by the external force without generating a force by itself, but without moving at one position, (Which may include rolling contact but at least move in the sense of including movement by slip), a considerably smaller force is required.

First, when a force is applied to the handle 16 or a hub motor provided in the rear casters 30 is operated to rotate about the center C in the stop state shown in (a), as shown in (b) Likewise, the center axis of rotation 24 of the front casters 20 is pushed rearwardly within the slots 14 of the frame 12. Therefore, the rear spring 40B is compressed, and accordingly, the front spring 40A is stretched.

When the force applied to the handle 16 of the cart or the force of the hub motor built in the rear casters 30 (hereinafter referred to as an external force acting on the cart) is applied, the front casters 20 move to another position The rotation center shaft 24 inside the slot 14 of the frame 12 rotating by the external force causes the slot 14 to move inside. That is, when the frame 12 is rotated by the external force, the rotation center shaft 24 moves in the opposite direction in accordance with the movement of the slot 14. At this time, It is not able to move by the resistance by the friction force, but it rotates only in the place.

That is, even if the external force that rotates the frame 12 rightward when the cart is rotated is not a large force (external force) for moving the caster 20 to another place, the force that the caster 20 can rotate in place This is because the force by which the frame 12 is rotated moves the rotating center shaft 12 in advance in the rotating direction through the slot 14 so as to precede the rotating direction as shown in (b) can do.

When the rotation of the frame 12 is started by the external force, the front part of the frame 12 starts to rotate to one side (for example, right side as in FIG. 5). The moment the rotation begins, the caster wheel 28 is subjected to frictional forces with the ground, and the center of rotation axis 24 within the slot 14 of the frame 12 moves in accordance with the guidance of the slot 14 do.

At this time, since the force required for the rotation center shaft 24 to move along the slot is significantly smaller than the force required for the front caster 20 to slip and move, the rotation center shaft 24 is moved first in the rotation direction along the slot . And, in accordance with this movement, the caster wheel 28 is only turned in its direction. When the direction of the caster wheel 28 is changed as the rotation center axis 24 precedes, the whole of the cart substantially becomes ready for rolling contact in the direction to be rotated.

As described above, in the present invention, the magnitude of the force required for the caster 20 to rotate in place is such that the caster 20 is moved to another place (except for the linear movement due to pure rolling contact, It can be seen that the rotation center axis 24 preceding the inside of the slot 14 when the frame 12 rotates is moved in the rotating direction first because it is significantly smaller than the magnitude of the force required to rotate the frame 12 .

Therefore, it is possible to rotate the frame 12 by a direction in which the external force is to be rotated, and it is considered that it is also possible to rotate the frame 12 at a substantially right angle, for example, as shown in Fig. In the case where the front casters 20 are constituted as a pair, the casters on the side where the turning radius is large at the time of rotation will be pushed further backward and the corresponding rear springs will be further compressed.

When the desired degree of rotation is completed, the external force will push the frame 12 substantially in the straight direction. In this state, since the force against the left-right rotation direction is lost, the spring 40 will return the rotation center shaft 24 to the original state by the elastic restoring force. As described above, it can be seen that the pair of springs 40A and 40B operate as a returning means for straightening. Also, in the present invention, the slot 14 has a meaning as means for moving the rotation center shaft 24 to the rotation direction side in advance based on the direction of the frame 12 due to external force.

The front casters 20 of the present invention can be most suitably applied to a pair of casings as shown in the drawings. However, the front casters 20 may be limited by the number of casters installed in front of the cart having the rear driving source It will not be possible. It will also be understood that, in the cart of the present invention, no limitation is imposed on the rear cast 30.

Next, another embodiment of the present invention will be considered. The rotation center shaft 24 of the front caster 20 is installed in the slot 14 of the frame 12 so as to be movable in the forward and backward direction (running direction) along the slot there was. However, it can be said that there is a substantial need for the present invention to constitute the caster itself so as to be able to move at regular intervals along the running direction.

Therefore, even if the slot 14 is not formed in the frame 12 of the cart, it is sufficient if the rotation center shaft 24 of the caster 20 is supported so as to be movable in the forward and backward direction with respect to the frame 12. Of course, even in such a case, it is preferable that the rotation center shaft 24 of the caster 20 is supported by a spring so that the caster 20 can be quickly returned straight after the change of direction.

As described above, in the description of the embodiment of the present invention, illustration and description are omitted for the specific configuration in which the rotation center shaft 24 can be supported at a constant height with respect to the frame 12, It is a matter of course that a variety of configurations can be made by those skilled in the art. For example, by having a structure in which the rotation center shaft is vertically supported with respect to the frame, the rotation center shaft can be configured to be movable at regular intervals in the running direction while maintaining a predetermined height with respect to the frame.

For example, the rotation center axis may be configured so as to be movably supported in the front-rear direction on the bottom surface of the frame. It is a matter of course that the forward and backward movement of the rotation center shaft can be made in a separate casing provided on the bottom surface of the frame.

In the illustrated embodiment, it is understood that the rotation center shaft is supported by the front spring and the rear spring. It will be appreciated from FIG. 5 that the rear spring is mainly operated when the rear spring travels substantially forward. In the case of rotating while traveling backward, on the contrary, it is natural that the forward spring will compress and perform its function.

In the illustrated embodiment, the springs are provided in front of and behind the rotational center axis, respectively. However, considering only the case of traveling in the future, it is also possible to provide a spring only in the rear of the center axis of rotation, and this configuration is expected to have a sufficient effect on the left-right rotation in the forward traveling.

In the illustrated embodiment, the configuration in which the rotation center shaft is movable in the forward and backward direction at a constant distance is the slot 14. However, as shown in the drawing, instead of a slot formed so as to pass through the upper and lower portions of the frame 12, a longitudinal groove having a predetermined length formed in the longitudinal direction at the bottom surface of the frame is constituted, It may be constructed so as to be supported so as to be movable in the longitudinal direction inside.

While the invention has been shown and described with reference to certain embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined by the appended claims. It is to be understood that the scope of protection of the present invention should be construed on the basis of the description of the appended claims.

12 ..... frame
14 ..... Slot
16 ..... handle
20 ..... front casters
22 ..... Casters bracket
24 ..... center of rotation axis
26 ..... wheel rotating shaft
28 ..... castor wheel
40 ..... spring
40A ..... front spring
40B ..... rear spring

Claims (6)

A frame capable of supporting the object;
A front caser provided on a bottom surface of the frame, the front casters being composed of a rotation center shaft, a caster bracket rotatably supported by the rotation center shaft, and a caster wheel rotatably supported by the caster bracket and running on the ground;
Supporting means for supporting the rotational center axis of the front casters so as to be movable in the front-rear direction with respect to the frame at regular intervals; And
And return means for returning the rotation center shaft supported by the support means to a predetermined position.
A frame capable of supporting the object;
A front caser provided on a bottom surface of the frame, the front casters being composed of a rotation center shaft, a caster bracket rotatably supported by the rotation center shaft, and a caster wheel rotatably supported by the caster bracket and running on the ground;
Supporting means for supporting the rotational center axis of the front casters so as to be movable rearward relative to the frame at regular intervals; And
And return means for returning the rotation center shaft supported by the support means to a predetermined position.
3. The cart according to claim 1 or 2, wherein the supporting means comprises a slot or a longitudinal groove formed in the forward and backward direction in front of the frame so that a rotation center shaft supported at a constant height with respect to the frame can be inserted.
The cart according to claim 3, wherein the returning means comprises a front spring and a rear spring installed in front of and behind the rotational center shaft in the slot or the longitudinal groove.
3. The apparatus according to claim 2, wherein the supporting means is constituted by a slot or a longitudinal groove formed in the forward and backward direction in front of the frame so that a rotation center shaft supported at a constant height with respect to the frame can be inserted, And a rear spring installed inside the longitudinal groove and behind the rotational center axis.
5. The cart according to claim 4, wherein the front casters are formed as a pair.
KR1020150158938A 2015-11-12 2015-11-12 A cart having caster wheel KR101743363B1 (en)

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KR1020150158938A KR101743363B1 (en) 2015-11-12 2015-11-12 A cart having caster wheel

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107757662A (en) * 2017-10-31 2018-03-06 徐林韵 A kind of smart supermarket hand-cart for shopping
KR102088289B1 (en) * 2018-09-27 2020-03-13 이수곤 Hand cart

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3023333B2 (en) * 1997-06-30 2000-03-21 ニチハ株式会社 Building boards and their painting methods
KR200377232Y1 (en) * 2004-10-20 2005-03-11 유우섭 An attach device of caster wheel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107757662A (en) * 2017-10-31 2018-03-06 徐林韵 A kind of smart supermarket hand-cart for shopping
KR102088289B1 (en) * 2018-09-27 2020-03-13 이수곤 Hand cart

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