KR101930679B1 - Caster applicable to transport trucks and their trucks - Google Patents

Abstract

The present invention relates to a transport cart and a caster applied to the transport cart, and more specifically, to a transport cart capable of safely and easily passing obstacles such as a bump on a floor when driving the transport cart, and a caster applied to the transport cart. The present invention provides the transport cart including: a support; a handle unit lifting unit; and a caster, wherein the lifting unit includes: a cover unit; a rotation guide bracket; a rotation bracket; a rotation restoring spring; a lifting unit; and a foot load unit. In addition, the present invention provides the caster including: a fixing plate; a caster housing; a first wheel of a rotation body; a brake pad; and an elastic spring.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a caster applicable to a carrier truck and a carrier truck thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a caster to be applied to a transportation vehicle and a transportation vehicle, and more particularly, to a caster which can stably and easily move an obstacle such as an unevenness to a floor at the time of traveling, The present invention can be applied to a carrier truck that is capable of loading and unloading a box containing a large amount of goods or objects, and which is capable of firmly locking and unlocking the wheels as well as enhancing the durability of the casters that drive the carrier trucks, Castors.

In general, items that are difficult to carry with a human hand are usually manually transported using a carrier truck.

On the other hand, when the operator loads the object to be transported and pushes the transport truck to the destination, if there is an obstacle such as unevenness protruding from the floor during the transportation of the truck, There is a problem that the carriage is excessively shaken in the process of pushing the carriage to the obstacle and the objects that have been loaded on the carriage collapse.

In addition, when the height of the obstacle such as the unevenness is high, the wheel is caught by the obstacle and can not travel. To solve these problems, two or more workers are needed. This is because one worker lifts the front part of the carriage and the other operator pushes the carriage forward and can overcome obstacles. Accordingly, there is a problem that the efficiency of the work is inferior because two or more workers must always work in a set.

In general, a caster which is freely rotatable in the left and right direction is used at the lower end of a cart or a cart for carrying articles. In particular, when the place of use is a place having a slope as well as a plain place, the brake is mounted on the caster.

However, in order to realize the function of such a brake, a folding pedal is used. The folding pedal is mounted on one side of the caster housing on which the wheels are mounted from below the bracket in order to freely rotate the caster 360 °. The caster housing equipped with the folding pedal for brake implementation has a bracket mounted on a carriage or a cart and is freely rotatable mounted at 360 ° so that the direction of the folding pad, which implements the brake function to be folded back and forth, is changed from time to time.

Further, since the structure of the conventional brake is a structure in which the pressing portion that is interlocked by the press pedal in which the brake is folded back and forth pushes or releases the wheel, there is a problem that the pressing portion is loosened frequently during use and the lock is released easily.

In addition, the conventional casters have wheels mounted on a caster housing fixedly coupled to a lower portion of a transportation truck. At this time, since the center of the wheel is offset with respect to the center of the caster housing, the force of removing the wheel due to the weight load is increased, and the range of the weight load is centered, There is a problem.

Korea Utility Model Registration No. 20-0463603 has been registered. Korean Patent Registration No. 10-0378213 has been registered.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide an air conditioner which can stably and easily pass obstacles such as concavo- The present invention relates to a caster which is capable of carrying a large number of objects or objects by connecting the cages to each other so as to be able to connect at least one of them, And a caster which is applied to the carriage.

According to an aspect of the present invention, there is provided a portable terminal comprising: a pedestal on which a box containing articles or objects is loaded; A handle portion detachably coupled to the pedestal to manipulate the running of the pedestal; An elevating unit detachably coupled to a lower end of the pedestal to elevate the pedestal; And a caster which is mounted on the lower end of the pedestal and runs the pedestal, wherein the pedestal includes: a cover part coupled to a lower end of the pedestal by a coupling means; A rotation guide bracket fixedly coupled to the inside of the upper portion of the cover portion and guiding a rotation operation of the lift portion and the foot rod portion; A rotation bearing coupled to the rotation guide bracket by a first hinge so as to be rotatable; A rotation restoring spring having one end fixed to the rotation guide bracket and the other end fixed to the rotation bearing; A lift unit coupled to one side of the rotation bearing by a first rotation guide shaft so as to be able to pivot; And a foot rod portion coupled to the other side of the rotation bearing by a second rotation guide shaft so as to be rotatable to manipulate the rotation operation of the lift portion.

The rotation guide bracket includes a rotation guide plate having a rotation hinge coupled to the rotation guide bracket by a first hinge so that the rotation bearing is rotatable. The first and second rotation guide shafts are respectively inserted into the rim of the rotation guide plate, And the first and second rotation guide grooves are formed so that the first and second rotation guide grooves are rotatably engaged.

In addition, a seating groove is formed on the inner side of the rotation bearing to receive a rotation restoration spring, and an inner side surface of the seating groove is formed with a fitting hole to which the other end of the rotation restoration spring is fitted, And a plurality of through holes through which the first and second rotation guide shafts are respectively inserted.

The lift portion may include a lift bar having one end of the rotation bearing and the other end thereof rotatably coupled by a first rotation guide shaft; A lifting bracket coupled to one end of the lift bar by a fixing shaft and having an elevation guide shaft at an upper portion thereof and being vertically moved up and down; An elevation guide bracket fixedly coupled to the inside of the upper portion of the cover portion and having elevation guide grooves hooked on the elevation guide shafts of the elevation brackets at both ends thereof to guide upward and downward movement of the elevation bracket; And a second wheel rotatably coupled to the one end of the lift bar by a fixing shaft together with the lifting bracket.

The foot rod portion may include a foot rod bar having one end rotatably coupled to the other side of the rotational bearing by a second rotation guide shaft; And a presser foot which is rotatably coupled to the other end of the foot rod bar by a second hinge.

In addition, the pedestal is formed in a rectangular shape as a whole, and each of the corners has a coupling bracket provided on the handle portion and a coupling portion coupled to the coupling bracket through a coupling means, and the coupling portion has a through- .

Further, the pedestal is characterized in that at least two or more of the pedestals can be connected by using a hook member.

Further, the handle portion may include a handle fixing portion cover; A coupling bracket provided at both ends of a front side of the handle fixing portion cover and detachably coupling the coupling portion of the pedestal; And a handle rotatably provided on an upper portion of the handle fixing portion cover.

According to another aspect of the present invention, there is provided a caster which is applied to a carrier truck, comprising: a stationary plate coupled to a pedestal of a carrier truck; A caster housing coupled to a lower portion of the fixing plate through a coupling cylinder and having first and second engaging protrusions formed on both ends thereof and having a latching groove formed at one side of the first engaging recess; A rotating body provided at an upper end of the caster housing to rotate the caster housing 360 degrees; A first wheel rotatably coupled to the inside of the caster housing through a hinge bolt; A brake pad coupled to the outside of the caster housing by a hinge bolt together with the first wheel to lock and unlock the first wheel; And an elastic spring having one end fixedly connected to the caster housing and the other end fixedly connected to the brake pad.

A plurality of brake blades protrude outward from both ends of upper ends of the upper and lower ends of the brake pads. The brake pawls protrude inwardly from the middle between the brake blades, The hinge bolt is formed in a lower portion of each of the second engaging recesses, and a slot for restricting the hinge bolt is formed on the lower portion of the second engaging recess. And an axial passage hole through which a spring support shaft is fixed is fixed to each end of the rear end of the elastic spring.

Further, each of the center axes of the fixed plate, the caster housing and the first wheel is positioned on the same vertical line on the same vertical line.

According to the present invention, since the elevating unit provided at the lower end of the pedestal of the transporting car lifts up the one end of the pedestal, it is possible to stably and easily move the transporting car when there is an obstacle such as unevenness on the floor at the time of traveling.

In addition, since a plurality of carrier trucks and a carrier truck can be connected to each other and used, a large amount of goods or boxes can be stacked and transported, thereby increasing the efficiency of the operation.

Also, by providing a caster that can restrain the 'X', 'Y', and 'Z' directions of the wheels, the wheels can be firmly locked.

In addition, since the fixed plate, the caster housing, and the first axle of the first wheel are arranged in parallel on the same vertical line, the durability of the caster is increased, so that the weight load applied to the pedestal is distributed in all directions to cause warping or twisting in the pedestal Can be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view for explaining a transportation carriage according to the present invention; Fig.
Fig. 2 is a perspective view of the coupling of Fig. 1; Fig.
3 is a perspective view for explaining a pedestal applied to the present invention;
4 is a rear view for explaining a handle portion applied to the present invention;
5 is an exploded perspective view for explaining an elevating unit applied to the present invention.
FIG. 6 is an assembled perspective view of FIG. 5; FIG.
FIG. 7 is a perspective view of FIG. 6 as viewed from below; FIG.
8 is a perspective view showing a state in which the cover portion is removed in the state of FIG. 6;
Fig. 9 is a side view of Fig. 8, showing a state before (a) operation and (b) being in an activated state.
Fig. 10 is a view schematically showing the state of use of the elevating unit. Fig. 10 (a) is a state before passing an obstacle such as unevenness, Fig. 10 to be.
11 is a perspective view showing a state in which a plurality of transport buggies are connected according to the present invention.
Fig. 12 is a use state view of the transportation vehicle according to the present invention; Fig.
13 is an exploded perspective view of the caster as viewed from the rear side of the present invention.
FIG. 14 is a perspective view for explaining a caster according to the present invention, wherein (a) shows a state in which the brake pad is unlocked, and (b) in which the brake pad is locked.
Fig. 15 is a view for explaining a state of use of the caster according to the present invention. Fig. 15 (a) is a state in which the third wheel is unlocked, (b) (C) is a state in which the third wheel is locked by pressing the brake wing of the brake pad against the foot in the state of (b).
16 is a side view showing the center shaft of the fixed plate, the caster housing and the first wheel with the caster applied to the present invention installed on the carrier.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms.

The terms used herein are used only for the purpose of distinguishing one element from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

Hereinafter, a description will be made of a transportation truck 10 applied to the present invention with reference to the accompanying drawings.

FIG. 3 is a perspective view for explaining a pedestal applied to the present invention, and FIG. 4 is a cross-sectional view of the handle according to the present invention. FIG. 5 is an exploded perspective view for explaining the elevation unit applied to the present invention, Fig. 6 is an assembled perspective view of Fig. 5, Fig. 7 is a perspective view of Fig. 6 as viewed from below, Fig. 9 is a view for explaining the connection relationship between the components of the elevating unit. Fig. 9 (a) shows the state prior to the operation, Fig. 9 (b) shows the state before the operation, Fig. 9 is a side view of Fig. 8, showing a state before (a) operation and (b) being in an activated state.

1 to 9, a carrier truck 10 according to the present invention includes a pedestal 100, a handle unit 200, a lift unit 300, and a caster 400.

The pedestal 100 applied to the present invention supports a box in which objects or objects are accommodated and supported. The pedestal 100 is formed in a rectangular shape as a whole. At each corner, And a coupling part 110 detachably coupled to the base 220.

At this time, a plurality of first bolt holes 111 are formed in each of the coupling portions 110 so as to be coupled to the coupling bracket 220 using bolts and nuts as coupling means.

Each of the engaging portions 110 is formed with at least two pedestal 100 and a hook member connecting hole 112 through which a hook member 160 for connecting and fixing the pedestal 100 is inserted.

The hook member 160 is provided with first and second hooks 161 and 162 each having a semicircular shape and a hook groove 161a is formed at both ends of the first hook 161, Hook protrusions 162a are formed at both ends of the first and second hooks 162 and 162 so as to be inserted into the hook grooves 161a and one ends of the first and second hooks 161 and 162 are fixed to each other .

A reinforcing rib 120 may be formed on the upper surface of the pedestal 100 to improve the strength.

Further, the left and right edges of the pedestal 100 are closely contacted with the outer surface of the lower end of the loaded box, so that the escape prevention wall 130 for preventing the box from being detached to the outside can be protruded upward to a predetermined height.

A mounting portion 140 is detachably mounted on the front and rear edges of the pedestal 100 so as to detachably mount the panel supporting member 150 supporting the panel 170.

At this time, a plurality of fitting insertion grooves 141 are formed in the mounting portion 140 so that the plurality of fitting protrusions 152 are inserted into the panel supporting member 150.

The panel supporting member 150 is formed with a panel mounting groove 151 to which the panel 160 is detachably mounted at an upper end portion and a fitting protrusion 152 into which the fitting insertion groove 141 is inserted, .

In addition, a plurality of second bolt holes 180 through which bolts, which are coupling means, pass through along the longitudinal direction of the center of the pedestal 100 are formed.

Meanwhile, in the state where the bolt, which is a coupling means, is mounted on the second bolt hole 180, the foreign matter is prevented from penetrating into the second bolt hole 180 on the outer side of the upper part of the second bolt hole 180, (Not shown in the figure) that prevents the box containing the object or the goods loaded in the box (not shown) from sliding may be covered.

The pedestal 100 is preferably made of a synthetic resin material such as plastic which is strong in durability, but is not limited thereto and may be made of various materials.

The handle part 200 of the present invention is detachably coupled with the pedestal 100 to operate the pedestal. The handle part 200 includes a handle fixing part 210, A coupling bracket 220 provided at both ends of the front side of the cover 210 for detachably coupling the coupling portion 110 of the pedestal 100 and a coupling bracket 220 rotatably mounted on the upper portion of the handle fixing cover 210 And a handle 230 provided thereon.

A plurality of opening holes 211 may be formed in the rear surface of the handle fixing cover 210 so that the rope ring 231 formed at the lower end of the handle 230 can be used by hanging the rope 231a from the outside.

The coupling bracket 220 is integrally formed in a U shape and includes a first bolt hole 111 formed in a coupling portion 110 of the pedestal 100 and a third bolt hole 221 corresponding to the first bolt hole 111 formed in the coupling portion 110 of the pedestal 100, .

A rope ring 231 may be formed on the lower end of the handle 230 so that the rope 231a can be used.

The handle unit 200 may be provided with a folding unit 240 so that the handle 230 can be folded and rotated to the left and right. Omit it.

The elevating unit 300 according to the present invention is detachably coupled to the center of the lower end of the pedestal 100 to elevate and lower the pedestal 100. The elevating unit 300 is mounted on the lower end of the pedestal 100, And a cover portion 310 coupled to the coupling portion by a bolt and a nut.

A plurality of fourth bolt holes 311 through which bolts for coupling the pedestal 100 with the rotation guide bracket 320 and the elevation guide bracket 352 are formed at the upper end of the cover portion 310.

An inlet port 312 is formed at one side of the lower end of the cover 310 to allow the second wheel 354 of the lift unit 350 built in the cover 310 to be pulled out.

And a rotation guide bracket 320 fixedly coupled to the inside of the upper portion of the cover unit 310 to guide the rotation operation of the lift unit 350 and the foot rod unit 360.

A rotation guide plate 321 is provided at the center of the rotation guide bracket 320.

The first and second rotary guide shafts 370 and 380 are respectively passed through the first and second rotary guide grooves 321a and 321a 321b are formed.

A spring stopper portion 322 is formed on the outer surface of the upper portion of the rotation guide plate 321 to which the one end of the rotation restoration spring 340 is fixed.

A hooking shaft 361a provided at a middle portion of the foot rod 361 is hooked to the rear end of the rotation guide bracket 320 to support the foot rod 361, 323 are provided.

At this time, a plurality of grooves 323a are formed on the inner lower end surface of the retainer 323 so that the retaining shaft 361a is hooked according to the positional change of the foot rod 361 with respect to the rotation angle.

In addition, a plurality of fifth bolt holes 324 through which the bolts pass are formed at the upper end of the rotation guide bracket 320.

And a rotation bearing 330 coupled to the rotation guide bracket 320 by a first hinge 335 rotatably.

At this time, a seating groove 331 into which the rotation restoration spring 340 is inserted is formed inside the rotation bearing 330.

In addition, a fitting hole 332 is formed in the inner surface of the seating groove 331 in which the other end of the rotation restoration spring 340 is fitted.

The first and second through holes 333 and 334 through which the first and second rotation guide shafts 370a and 370b are inserted are formed in the outer periphery of the seating groove 331, respectively.

A plurality of first and second through holes 333 and 334 through which the first and second rotation guide shafts 370 and 380 are inserted are respectively formed on the outer periphery of the seating groove 331. [

And a rotation restoring spring 340 fixed at one end to the rotation guide bracket 320 and having the other end fixed to the rotation bearing 330.

More preferably, the rotation restoration spring 340 is seated in the seating groove 331 of the rotation bearing 330, and the other end is inserted and fixed in the insertion hole 332 formed in the seating groove 331, The one end of the spring 340 is bent into the 'A' shape so that it is hooked on the spring stopper portion 322 formed on the rotation guide plate 321 and is always kept fixed.

That is, one end of the rotation restoration spring 340 is fixed to the rotation guide bracket 320 at all times. As the pushing plate 362 is pressed, the rotation bearing 330 is rotated in either direction, 362 is released, the rotating bearing 330 which has been rotated is returned to its original position.

And a lift unit 350 coupled to one side of the rotation bearing 330 by a first rotation guide shaft 370 so as to vertically move the pedestal 100.

The lift unit 350 includes a lift bar 351 which is rotatably coupled to one side of the rotation bearing 340 by a first rotation guide shaft 370 at the other end.

Further, a lifting bracket 352 coupled to the one end of the lift bar 351 by a fixing shaft 352a and moving up and down is provided.

At this time, an elevation guide shaft 352b for hanging an elevation guide groove 353a formed on the elevation guide bracket 353 is provided inside the upper part of the elevation bracket 352. On the other hand, both ends of the lifting guide shaft 352b are preferably fixed on the lifting bracket 352 by a snap ring 352c.

Further, an elevation guide bracket 353 fixed to the inside of the upper portion of the cover part 310 by bolts and nuts serving as engaging means and guiding the up-and-down movement of the above-described lifting bracket 352 is provided.

At both ends of the elevation guide bracket 353, elevation guide grooves 353a are formed to be hooked on the elevation guide shaft 352b provided on the elevation bracket 353 described above.

In addition, a plurality of sixth bolt holes 353b through which the bolts as the engaging means are inserted are formed at the upper end of the elevation guide bracket 353.

Further, a second wheel 354 is provided at one end of the lift bar 351 to be coupled with the lifting bracket 352 and rotated by the fixed shaft 352a.

And a foot rod portion 360 coupled to the other side of the above-described rotary bearing 330 by a second rotation guide shaft so as to be rotatable to manipulate the rotation operation of the lift portion 350.

The foot rod unit 360 includes a foot rod bar 361 which is coupled to the other side of the rotational bearing 330 by a second rotation guide shaft 380 so that one end of the foot rod unit 360 is rotatable.

A center axis of the foot rod bar 361 is provided with a latching shaft 361a which is hooked to the retaining bracket 323 provided on the rotation guide bracket 320 described above.

The other end of the foot rod bar 361 is provided with a presser foot 362 which can be stepped on.

At this time, the presser foot 362 is rotatably coupled to the other end of the foot rod 361 by a second hinge 362a, and can be folded and used.

The elevating unit 300 configured as described above presses the pressing foot 362 by stepping on the foot as shown in FIG. 9A. 9B, the second rotation guide shaft 380, which is located at the lower portion of the second rotation guide groove 321b, is rotated in the direction of the upper portion of the second rotation guide groove 321b as the rotation bearing 330 is rotated in one direction, And the first rotation guide shaft 370 located at the upper portion of the first rotation guide groove 321a descends to the lower portion of the first rotation guide groove 321a. The lift bar 351 is lowered and the lift bracket 352 coupled to the one end of the lift bar 351 is detached from the lift guide bracket 353 and is lowered to lower the front portion of the support 100 And lift it up to the top.

When the foot of the presser foot 362 is removed in the above state, the rotation bearing 330 is rotated in the other direction by the restoring force of the rotation restoring spring 340, so that the upper part of the second front guide groove 321b The first rotation guide shaft 370 located at the lower portion of the first rotation guide groove 321a and the second rotation guide shaft 380 positioned at the lower portion of the second rotation guide groove 321b are moved downward And is raised to the top of the rotation guide shaft 370. The lifting bracket 352 coupled to one end of the lift bar 351 is engaged with the lifting guide bracket 353 so that the front part of the lifting bar 351 is lowered do.

In other words, as shown in FIG. 10A, if there is an obstacle such as an unevenness on the floor during traveling of the transportation truck 10, the pressing footboard is stepped on as shown in FIG. 10B, so that the one end of the transportation truck 10 is lifted up. Then, the caster 400 is pushed forward through the second wheel 354 which is in close contact with the floor, and the caster 400 is placed on an obstacle such as an uneven surface. Then, the stepped foot of the presser foot 362 is pushed out and moved forward, It is beyond the obstacles.

As shown in FIG. 11, at least two carrier trucks 10 and a carrier truck 10 may be connected to each other. In addition, as shown in FIG. 12, the carrier truck 10 ).

Hereinafter, a caster 400 according to the present invention will be described with reference to the accompanying drawings.

FIG. 13 is an exploded perspective view of the caster according to the present invention viewed from the rear, FIG. 14 is a perspective view for explaining a caster according to the present invention, wherein (a) shows a state in which the brake pad is unlocked, (b) Is in a locked state.

The caster 400 according to the present invention will be described with reference to Figs. 13 and 14. Fig.

A plurality of casters 400 according to the present invention are mounted on the lower end of the pedestal 100 of the transportation truck 10 to run the transportation truck 10. Such a casters 400 can be installed on the pedestal 100, And a fixing plate 410 which is coupled and fixed to the lower end of the corner.

In the center of the fixing plate 410, a coupling cylindrical hole 411 through which the coupling cylinder 470 passes is formed.

In addition, a plurality of seventh bolt holes 412 through which a bolt as a coupling means passes are formed on the outer surface of the coupling cylindrical hole 411.

And a caster housing 420 coupled to a lower portion of the fixing plate 410 via a coupling cylinder 470. [

At both ends of the caster housing 420, the second locking projections 453 of the brake pads 450 and the corresponding first locking projections 421 are protruded.

An engaging groove 422 is formed at one side of the first engaging protrusion 421 so that the engaging piece 452 of the brake pad 450 is inserted and hooked.

At this time, it is preferable that the upper side of the engaging groove 422 is formed to be slightly narrower than the width of the engaging piece 452. The reason for this is that the locking pawl 452 is securely inserted into the upper side of the locking groove 422 so that the brake pad 450 can be firmly fixed.

In addition, a hinge bolt hole 423 is formed in the center of the caster housing 420 so that the hinge bolt 480 can penetrate and be nut-coupled.

In addition, a spring retaining groove 424 may be formed on the outer surface of the upper portion of the caster housing 420, to which an end of an elastic spring 460 to be described later is fixed by being hooked.

The upper end of the caster housing 420 is provided with a rotating body 430 for rotating the caster housing by a predetermined angle, and the predetermined angle may be 360 degrees.

Meanwhile, the rotating body 430 is a ball bearing used in general, and a detailed description thereof will be omitted.

Also, a first wheel 440 rotatably coupled to the inside of the caster housing 420 through a hinge bolt 480 is provided.

The brake pad 450 is coupled to the outer side of the caster housing 420 by the hinge bolt 480 together with the first wheel 440 to lock and unlock the first wheel 440.

At this time, brake pawls 451 are protruded outwardly from both ends of upper ends of both ends of the brake pads 450 so that the brake pads 450 in a locked state can be stepped on and released.

At the center between the respective brake blades 451, a retaining piece 452 which is fitted in each of the retaining grooves 422 formed in the caster housing 420 is protruded inward.

A second engaging projection 453 is formed on one side of each engaging piece 452 so as to be in close contact with the first engaging projection 421 and protrude therefrom.

A hinge bolt 480 penetrates under each second locking projection 453 and a long hole 454 for restricting the hinge bolt 480 while moving up and down with respect to the through hinge bolt 480 is formed do.

In addition, an axial passage hole 455 through which a spring support shaft 490 is fixed is formed at each of the rear end portions, to which the other end of the elastic spring 460 is fixed.

Further, an auxiliary vane 456 may be further provided on the front portion of the brake pad 450 so that the brake pad 450 can be lifted up.

Hereinafter, the use method and operation of the caster 400 according to the present invention will be described in detail.

First, in a state as shown in FIG. 15A, the front portion of the brake pad 450 is hit or lifted by foot as shown in 15b. Both ends of the hinge bolt 480 penetratingly coupled to the first wheel 440 are closely attached to the inside of the lower portion of each of the slots 454 formed in the brake pad 450 to constrain the hinge bolt 480. That is, the 'Z' direction of the first wheel 440.

The engaging pieces 452 formed on the brake pads 450 positioned below the engaging grooves 422 formed in the caster housing 420 are forcedly inserted into the upper portions of the engaging grooves 422 and the brake pads 450 The one side of the protruding second locking projection 453 is in close contact with the other side of the first locking projection 421 protruding from the caster housing 420 so that the first and second wheels 440 and 440 ' .

As described above, the brake pads 450 can securely lock the wheels by restricting the first wheels 440 in the 'X', 'Y', and 'Z' directions.

Conversely, in order to unlock the brake pad 450, the brake wing 451 is stepped on and lowered as shown in FIG. 15C. Then, the locking piece 452, which is inserted in the upper part of the locking groove 422, is released, thereby releasing the lock in the state as shown in FIG. 15A.

At this time, when the brake pad 450 is unlocked, the elastic spring 460 tilts up a certain height as the rear end portion of the brake pad 450 is pulled, and the upper end of the second locking projection 453 is tilted to the first locking projection 421, so that the locked state is maintained.

16, the center axes of the fixed plate 410, the caster housing 420, and the first wheel 440 are positioned on the same vertical line on the same vertical line. The reason for this is to minimize the occurrence of warping or twisting of the pedestal 100 by dispersing the weight load applied to the pedestal 100 in four directions by increasing the durability of the castor.

The technical idea of the caster to be applied to the carrier truck of the present invention and the carrier truck thereof is that the same result can be repeatedly practically practiced. In particular, by implementing the present invention as described above, technological development can be promoted to contribute to industrial development, have.

10: Cargo truck
100: Base
110: engaging portion 111: first bolt hole 112: hook member connecting hole
120: reinforcing rib
130:
140: mounting portion 141: fitting insertion groove
150: panel supporting member 151: panel mounting groove 152:
160: hook member 161: first hook 162: second hook 163:
170: Panel
180: second bolt hole
200:
210: handle fixing part cover 211: opening hole
220: coupling bracket 221: third bolt hole
230: handle 231: rope loop
240: Folding means
300: lift unit
310: cover part 311: fourth bolt hole 312: inlet port
320: rotation guide bracket 321: rotation guide plate
321a: first rotation guide groove 321b: second rotation guide groove 322:
323: Retaining ring 323a: groove 324: fifth bolt hole
330: rotation bearing 331: seat groove 332: insertion hole 333: first through hole
334: second through hole 335: first hinge
340: rotation restoring spring
350: lift portion 351: lift bar 352: lift bracket 352a:
352b: an elevation guide shaft 352c: a snap ring 353: an elevation guide bracket
353a: an elevation guide groove 353b: a sixth bolt hole 354: a second wheel
360: foot rod portion 361: foot rod bar 361a:
362: Presser foot 362a: Second hinge
370: first rotation guide shaft
380: second rotation guide shaft
400: castor
410: fixing plate 411: engaging cylindrical hole 412: seventh bolt hole
420: caster housing 421: first locking projection 422:
423: Hinge bolt hole 424: Spring hook groove
430: rotating body
440: First wheel
450: Brake pad 451: Brake blade 452:
453: second stumbling block 454: long hole 455: shaft hole 456:
460: Elastic spring
470:
480: Hinge Bolt
490: spring support shaft

Claims (9)

A pedestal on which a box containing objects or objects is loaded;
A handle portion detachably coupled to the pedestal to manipulate the running of the pedestal;
An elevating unit detachably coupled to a lower end of the pedestal to elevate the pedestal; And
And a plurality of casters mounted on a lower end portion of the pedestal to run the pedestal,
The elevating unit includes:
A cover portion coupled to a lower end portion of the pedestal by a coupling means;
A rotation guide bracket fixedly coupled to the inside of the upper portion of the cover portion and guiding a rotation operation of the lift portion and the foot rod portion;
A rotation bearing coupled to the rotation guide bracket by a first hinge so as to be rotatable;
A rotation restoring spring having one end fixed to the rotation guide bracket and the other end fixed to the rotation bearing;
A lift unit coupled to one side of the rotation bearing by a first rotation guide shaft so as to be able to pivot; And
And a foot rod portion coupled to the other side of the rotation bearing by a second rotation guide shaft so as to be rotatable to manipulate the rotation operation of the lift portion.
The method according to claim 1,
The first and second rotation guide shafts are respectively inserted into the rim of the rotation guide plate so that both ends of the rotation guide plate pivot Wherein the first and second rotation guide grooves are formed so that the first and second rotation guide grooves are engaged with each other.
The method according to claim 1,
Wherein an inner circumferential surface of the rotation restoration spring is formed with an insertion groove on the inner side of the rotation bearing and on which an rotation restoration spring is inserted and seated, 1 and the second rotation guide shaft are inserted through the through holes.
The method according to claim 1,
The lift unit includes:
A lift bar on one side of the rotation bearing, the other end of which is rotatably coupled by the first rotation guide shaft;
A lifting bracket coupled to one end of the lift bar by a fixing shaft and having an elevation guide shaft at an upper portion thereof and being vertically moved up and down;
An elevation guide bracket fixedly coupled to the inside of the upper portion of the cover portion and having elevation guide grooves hooked on the elevation guide shafts of the elevation brackets at both ends thereof to guide upward and downward movement of the elevation bracket; And
And a second wheel rotatably coupled to one end of the lift bar by a fixing shaft together with the lifting bracket.
The method according to claim 1,
The footload unit includes:
A foot rod bar coupled to the other side of the rotation bearing by the second rotation guide shaft so as to be rotatable at one end thereof; And
And a presser foot which is rotatably coupled to the other end of the foot rod bar by a second hinge.
The method according to claim 1,
The bracket is formed in a rectangular shape as a whole. Each corner is formed with a coupling bracket provided on a handle portion and a coupling portion coupled with a coupling means, and the coupling portion is formed with a through hole through which a hook member passes Cargo truck.
The method according to claim 1,
The caster includes: a stationary plate coupled to a pedestal of the transportation truck;
A caster housing coupled to a lower portion of the fixed plate through a coupling cylinder, having first and second locking projections formed on both ends thereof, and a locking groove formed on a side of each of the first locking projections;
A rotating body provided at an upper end of the caster housing to rotate the caster housing by a predetermined angle;
A first wheel rotatably coupled to the inside of the caster housing through a hinge bolt;
A brake pad coupled to the outside of the caster housing by the hinge bolt together with the first wheel to lock and unlock the first wheel; And
And an elastic spring having one end fixedly connected to the caster housing and the other end fixedly connected to the brake pad.
8. The method of claim 7,
A plurality of brake blades protruding outwardly from both ends of upper ends of both ends of the brake pads, respectively, a latching piece fitted in the latching grooves is protruded inward in the middle between the respective brake blades, And a second engagement protrusion formed on the first engagement protrusion so as to be in close contact with the first engagement protrusion. Each of the second engagement protrusions has a hole through which the hinge bolt penetrates, and a slot for restricting the hinge bolt, And an axial passage hole through which a spring support shaft is fixed is fixed to each end of the rear end of the elastic spring.
8. The method of claim 7,
Wherein each of the center axes of the stationary plate and the caster housing and the first wheel are positioned on the same vertical line.

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