KR101964447B1 - Goods transportation cart - Google Patents

Abstract

The present invention relates to a cart for transporting articles, which allows a user to be grasped or pushed to simply move after loading a small transport article. The present invention includes: a lower frame formed in a flat square board shape so as to load articles on an upper side, having a plurality of penetration holes vertically penetrated in a line, respectively having moving means on lower sides of each corner; and a handle formed in a reverse u shape and fixedly installed thereon after being slidingly moved in a horizontal direction on a back end of the lower frame.

Description

Goods delivery truck {GOODS TRANSPORTATION CART}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bogie for transporting goods, and more particularly, to a bogie for transporting goods, which can be easily held by a user after holding a small article.

The conveying cart designed for the purpose of conveying the loaded goods is provided with a conveying means for conveying the various items in the redistribution plate and moving the redistribution plate in the corresponding direction by the conveying wheel installed on the bottom when the conveyor pulls the direction in which the handle is to be conveyed. to be.

In case of such a carriage, it is necessary to provide a safe transport in the transport of the loaded goods, to load the proper weight of the goods so that the transportation operation of the carrier is easy, and to prevent the visibility in the transportation operation The height of the goods had to be set at the level.

However, in the case of conventional transport bills including the conventional art, there are many restrictions and inconveniences as the goods are loaded and transported in a structure already equipped regardless of the type of the carrier or the goods to be carried, There is a problem that this is caused.

In addition, since the articles mounted on the loading plate of the transportation truck are simply stacked in multiple layers or bundled by separate fixing means and transported, various types of loading space and loading method can not be provided, The transfer could not be carried out and the loaded goods could be easily taken off by carelessness of the carrier.

On the other hand, the background art described above is technical information acquired by the inventor for the derivation of the present invention or obtained in the derivation process of the present invention, and can not necessarily be a known technology disclosed to the general public before the application of the present invention .

Korean Patent No. 10-1785453 Korean Patent No. 10-1143593

One aspect of the present invention provides a bogie for transporting goods, which is implemented so that a user can hold it by hand or push it with ease after loading a small article.

According to another aspect of the present invention, there is provided a bogie for carrying goods, which can be lifted or lowered by a frame on which a load is lifted according to a user's need.

The technical problem of the present invention is not limited to the technical problems mentioned above, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided a goods transporting bogie, which is formed in the form of a flat rectangular plate so that an object can be placed on the upper side thereof, a plurality of through holes formed through the up and down direction are formed in rows, A lower frame on which moving means are respectively formed; And a handle which is formed in the shape of "P" and slidably moved in the left and right direction from the rear end of the lower frame and fixedly installed.

In one embodiment, the lower frame includes: a front end frame installed at a front end; A rear end frame spaced apart from the front end frame and provided at a rear end thereof; Three intermediate frames provided between the front end frame and the rear end frame on both sides in the longitudinal and longitudinal directions; And two support plates formed in a space between two intermediate spaces formed by the three intermediate frames, the rear frame being formed in a shape of a rectangular plate in which a plurality of through holes are formed in rows, A first vertical frame provided on one side of the upper end of the rear end frame; A second vertical frame installed on the other side of the upper portion of the rear frame; And a horizontal frame extending from an upper side of the first vertical frame to an upper side of the second vertical frame so as to be held by a user by the user, wherein the first vertical frame or the second vertical frame has a lower side, At least one column which is slidably moved along the groove in the left and right direction and which is fixed to one side or the other side of the rear frame by a bracket of the "C " An upper frame supported by the at least one post and disposed in parallel with the lower frame to load the object on the upper side; And a hydraulic jack installed between the lower frame and the upper frame for lifting and lowering the upper frame using an external force provided by a user to lift and lower an object seated on the upper frame, A main body in which an inner cylinder and a lifting piston are disposed; A pressure piston provided outside the main body and communicating with the main body to maintain a closed state, and a pressure piston is formed inside the main body, and when the pressure piston is lowered after the working fluid is sucked as the pressure piston rises, An outer cylinder for providing a working fluid to the inner cylinder; A pressure lever connected to the pressure piston disposed inside the outer cylinder to transmit an external force provided by the user to the pressure piston; And a release valve releasing the pressure of the inner cylinder according to an operation of a user to cause the working fluid introduced into the inner cylinder to be recovered to the main body, wherein the outer cylinder is provided in a plurality of outer cylinders, Comprises a first outer cylinder formed along a central axis coaxial with the pressure lever and at least one second outer cylinder disposed about the diameter of the first outer cylinder, the first outer cylinder and the at least one second cylinder 2 The sum of the diameters of the outer cylinders is 1/3 or less of the diameter of the inner cylinder and the first outer cylinder and at least one of the second outer cylinders are connected through an inflow pipe And the hydraulic jack is connected to the main body, and the hydraulic jack is formed in each of the first outer cylinder and the at least one second outer cylinder Selectively opening and closing the inlet pipe of the can may further include a control means for varying the strength W of the pressure piston.

According to one aspect of the present invention, a small article is loaded, and then the user grips or pushes the article with ease, and the frame on which the load is mounted is lifted or lowered according to the user's need, So that the efficiency of the work can be improved.

FIG. 1 is a diagram showing a schematic configuration of an individual inherent perceptual frequency tuning device according to an embodiment of the present invention.
FIG. 2 is a view showing a lower frame of FIG. 1. FIG.
Figure 3 is a view showing the handle of Figure 1;
FIG. 4 is a view showing a schematic configuration of a goods transportation truck according to another embodiment of the present invention.
5 is a perspective view showing a specific configuration of the hydraulic jack shown in Fig.
FIG. 6 is a conceptual diagram for explaining the internal construction and operation principle of the hydraulic jack shown in FIGS. 4 and 5. FIG.
7 is a view showing an outer cylinder and a connecting portion.
8 is a view showing a schematic configuration of a goods transportation truck according to another embodiment of the present invention.
9 to 11 are perspective views showing a hydraulic jack according to another embodiment of the present invention.
Fig. 12 is a view showing a schematic configuration of a goods transportation truck according to still another embodiment of the present invention.
13 is a view showing the elastic support portion of FIG.
14 is a view showing the first plate of Fig.
15 is a flowchart illustrating a method of producing a plastic sheet for producing the plastic sheet of the present invention.
FIG. 16 is a view showing the load distribution unit of FIG. 12;

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

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

1 is a view showing a schematic configuration of a goods transportation truck according to an embodiment of the present invention.

Referring to FIG. 1, a goods transporting truck 10 according to an embodiment of the present invention includes a lower frame 100 and a handle 200.

The lower frame 100 is formed in the shape of a flat rectangular plate so that an object can be placed on the upper side, and a plurality of through holes 141 (see FIG. 2) A moving means 150 (see FIG. 2) is formed on the lower side, and a handle 200 is provided on the rear side.

The lower frame 100 can be made to move more easily by reducing the overall weight as the through holes 141 are formed, and when the water flows down from the loaded object, the lower frame 100 falls downward to corrode the present invention by moisture It can be effectively prevented.

In addition, the lower frame 100 can be moved more easily even when a heavy object is loaded using the moving means 150 formed of a roller or the like.

The handle 200 is formed in the shape of "P" and is slidably moved laterally from the rear end of the lower frame 100, and is fixedly installed.

The goods conveying truck 10 having the above-described structure can be easily moved by holding or pushing a small article after it is loaded by the user, and by lifting or lowering the frame on which the load is loaded according to the user's needs, In addition, the lifting and lowering can be simplified and the efficiency of the work can be improved.

FIG. 2 is a view showing a lower frame of FIG. 1. FIG.

2, the lower frame 100 includes a front frame 110, a rear frame 120, three intermediate frames 130-1, 130-2 and 130-3, two support plates 140- 1 and 140-2, and a moving means 150. [

The front frame 110 is spaced apart from the rear frame 120 and is provided at the front end and three intermediate frames 130-1, 130-2 and 130-3 are provided between the front frame 110 and the rear frame 120. [

The rear end frame 120 is spaced apart from the front end frame 110 and is provided at the rear end and three intermediate frames 130-1, 130-2, and 130-3 are provided between the front end frames 110. [

In one embodiment, the rear end frame 120 may be formed with a sliding groove 121 formed in the left and right longitudinal direction.

The intermediate frames 130-1, 130-2 and 130-4 are provided on both sides in the longitudinal and longitudinal directions between the front end frame 110 and the rear end frame 120, And a support plate 140 is installed in each space.

The support plates 140-1 and 140-2 are formed in a rectangular plate shape in which a plurality of through holes 141 are formed in rows and are installed in two spaces defined by three intermediate frames 130 do.

Figure 3 is a view showing the handle of Figure 1;

Referring to FIG. 3, the handle 200 includes a first vertical frame 210, a second vertical frame 220, and a horizontal frame 230.

The first vertical frame 210 is spaced apart from the second vertical frame 220 on one side of the upper frame 120 and a horizontal frame 230 is installed on the upper side.

The second vertical frame 220 is spaced apart from the first vertical frame 210 on the other side of the upper frame 120 and a horizontal frame 230 is installed on the upper side of the second vertical frame 220.

In one embodiment, the first vertical frame 210 or the second vertical frame 220 is slid downward along the sliding groove 121 in the left and right direction, And may be fastened by fastening means 250 such as a bolt to one side or the other side of the frame 120.

The horizontal frame 230 extends from the upper side of the first vertical frame 210 to the upper side of the second vertical frame 220 so as to be held by the user.

FIG. 4 is a view showing a schematic configuration of a goods transportation truck according to another embodiment of the present invention.

Referring to FIG. 4, a goods transportation truck 20 according to another embodiment of the present invention includes a lower frame 100, a handle 200, at least one column 310, an upper frame 320, and a hydraulic jack 400 ). Here, since the lower frame 100 and the handle 200 are the same as those of FIG. 1, their description will be omitted.

At least one column 310 is provided on the upper surface of the lower frame 100, and the length thereof is variable.

As shown in the figure, the pillars 310 may be provided at four corners of the lower frame 100, but the number of the pillars 310 is not limited.

The pillars 310 may be provided in such a form that the length thereof can be varied. For example, the column 310 may include an outer column having a first diameter and an inner column having a diameter smaller than the first diameter and inserted into the outer column and sliding along the longitudinal direction of the outer column. In this case, if the inner column is slid in the direction of insertion into the outer column, the entire length of the column 310 is shortened, and if the inner column is slid in a direction protruding from the outer column, the overall length of the column 310 may be increased. However, it is needless to say that the column 310 is not limited to the above-described configuration, and can be replaced with other conventional structures as long as the length can be varied by an external force.

The upper frame 320 may be supported from the lower frame 100 by at least one column 310 and disposed in parallel with the lower frame 100. When the length of the column 310 is increased, the upper frame 320 moves up and down from the ground while the upper frame 320 is seated on the upper frame 320 .

That is, the goods transporting truck 20 having the above-described configuration can provide a structure that can simply raise or lower the upper frame 320 on which the various loads are placed, , The upper frame 320 can be lifted or lowered according to the height of the loaded article, thereby facilitating the unloading operation more easily and easily.

The hydraulic jack 400 is a device that provides a boost to the column 310. The hydraulic jack 400 is installed between the lower frame 100 and the upper frame 320 and adjusts the length of the pillar 310 by using an external force provided by the user in order to raise / The upper frame 320 can be raised and lowered. In this regard, the description will be made with reference to Figs. 5 to 7 together.

FIG. 5 is a perspective view showing a specific configuration of the hydraulic jack 400 shown in FIG. 4, and FIG. 6 is a conceptual diagram for explaining an internal configuration and operation principle of the hydraulic jack 400 shown in FIGS.

Specifically, the hydraulic jack 400 according to one embodiment of the present invention includes a main body 410, an outer cylinder 420, a press lever 430, and a release valve 440.

The main body 410 is a cylindrical member, and a space in which a working fluid can be stored is formed, and an inner cylinder 411 and an elevating piston 412 can be disposed therein.

The inner cylinder 411 is a cylindrical member formed inside the main body 410. A working fluid may be stored between the main body 410 and the inner cylinder 411. [

The lifting piston 412 is a member provided on the inner cylinder 411 and reciprocating along the longitudinal direction of the inner cylinder 411. That is, when the working fluid is supplied to the inner cylinder 411, the lifting piston 412 is raised by the pressure of the working fluid to increase the length of the column 310, The upper frame 320 can rise from the ground.

The outer cylinder 420 is a member for supplying fluid to the inner cylinder 411 and may be connected to the main body 410 through a fastening bracket 415 so as to maintain the sealed state with the main body 410. A pressure piston 421 is formed inside the pressure piston 421 and the pressure piston 421 can be raised or lowered by the pressure lever 430.

The pressure lever 430 is connected to the pressure piston 421 and transmits the external force provided by the user to the pressure piston 421.

7 is a view showing an outer cylinder 420 constituting the hydraulic jack 400 and a connecting portion 422 for engaging the pressure piston 421 and the pressure lever 430 of the outer cylinder 420, The pressure piston 421 formed inside the piston 420 is physically coupled to the pressure lever 430 through the connection portion 422. Due to such a structural feature, the pressure piston 421 is pressed by the pressure lever 430, An external force can be delivered.

The press lever 430 is formed with a through hole for engaging a member such as a pipe or the like that can be held by the user. The user moves the pipe up and down in a state where the pipe is coupled to the press lever 430 An external force may be applied to the pressure lever 430. [ In another embodiment of the present invention, the pressure lever 430 may include the pipe described above or may be provided integrally with the pipe.

A specific operation principle of the hydraulic jack 400 according to an embodiment of the present invention is as follows. When a user pushes the pressing lever 430 in a state where an object to be raised by the hydraulic jack 400 is seated on the upper frame 320 A negative pressure is formed in the outer cylinder 420 while the pressure piston 421 is lifted. Accordingly, the working fluid stored between the main body 410 and the inner cylinder 411 can flow into the outer cylinder 420 along the suction pipe 451.

Thereafter, when the user presses the pressure lever 430, the pressure piston 421 descends and applies pressure to the working fluid sucked into the outer cylinder 420. Thus, the working fluid sucked into the outer cylinder 420 can move to the inner cylinder 411 along the supply pipe 452. [ At this time, a check valve is provided at one end of the suction pipe 451 connected to the outer cylinder 420 so that the working fluid can be fed only along the supply pipe 452. The lift piston 412 rises by the pressure of the working fluid flowing into the inner cylinder 411. As the pressure of the inner cylinder 411 gradually increases, the lift piston 412 gradually rises, and the lift piston 412 is gradually lifted up by the pressure of the lift piston 430. As a result, 412) to lift the object placed on the top.

The release valve 440 is formed at one end of the supply pipe 452 and is a valve-shaped member for releasing the pressure of the inner cylinder 411 according to the user's operation. That is, when the user desires to lower the object to its original position, when the release valve 440 is opened, the high-pressure filled working fluid flowing into the inner cylinder 411 receives the gravity of the object through the recovery pipe 530 The pressure of the lifting piston 412 is returned to the main body 410 and the pressure of the inner cylinder 411 is lowered so that the lifting piston 412 is lowered by the gravity of the object and the object can descend to the original position .

As described above, the hydraulic jack 400 according to the embodiment of the present invention can lift or lower heavy objects by using a small force repeatedly applied from the user to the pressure lever 430. [

Meanwhile, in another embodiment of the present invention, the user can adjust the magnitude of the pressure provided to the lifting piston 412 according to the type of object and the type of work to be performed. In this regard, the description will be made with reference to Figs. 8 to 11 together.

8 is a view showing a schematic configuration of a goods transportation truck according to another embodiment of the present invention.

The object transporting cart 30 according to another embodiment of the present invention includes a lower frame 100, a handle 200, at least one pillar 310, an upper frame 320, and a hydraulic jack 400a do.

The lower frame 100, the handle 200, the at least one column 310 and the upper frame 320, which constitute the goods transporting truck 30 according to another embodiment of the present invention shown in FIG. 8, 4 are the same as the lower frame 100 and the upper frame 320 constituting the portable lifting device 420 having the hydraulic jack according to the embodiment of the present invention shown in FIG.

4, the hydraulic jack 400 according to an embodiment of the present invention, which constitutes the goods transporting carriage 30 shown in FIG. 4, And is replaced with the hydraulic jack 400a according to the example. In this regard, the description will be made with reference to Figs. 9 to 11 together.

9 to 11 are perspective views illustrating a hydraulic jack 400a according to another embodiment of the present invention.

FIG. 9 is a perspective view of a hydraulic jack 400a according to another embodiment of the present invention, FIG. 10 is a view comparing external cylinders constituting the hydraulic jack 400a of FIG. 9, and FIG. 11 is a cross- 400a in accordance with an embodiment of the present invention.

The hydraulic jack 400a according to another embodiment of the present invention includes a main body 410, outer cylinders 420a, 420b, 420c, 620d, 620e, 620f, a press lever 430, and a release valve 440 .

The main body 410, the press lever 430 and the release valve 440 constituting the hydraulic jack 400a according to another embodiment of the present invention shown in FIG. The pressurizing lever 430 and the release valve 440 constituting the hydraulic jack 400 according to the embodiment of the present invention will be omitted.

The hydraulic jack 400a according to another embodiment of the present invention may include a plurality of outer cylinders 420 shown in FIG. That is, in the hydraulic jack 400a according to another embodiment of the present invention, a plurality of outer cylinders 420a, 620b, 420c, 420d, 420e, 420f, and 420g may be connected to the pressure lever 430. [ Referring to FIG. 8, the hydraulic jack 400a according to another embodiment of the present invention includes six outer cylinders 420b, 420c, and 420c around a first outer cylinder 420a formed along a central axis coaxial with the push lever 430, 420d, 420e, 420f, and 420g are arranged along the circumference of the first outer cylinder 420a. However, the present invention is not limited thereto, and the number of the outer cylinders is not limited to two or more.

Each of the outer cylinders 420a, 420b, 420c, 420d, 420e, 420f, and 420g is provided in a cylindrical shape, and a pressure piston is formed therein. That is, when the user applies an external force to the hydraulic jack 400a by operating the pressure lever 430, the pressure lever 430 transmits the external force to the external cylinders 420a, 420b, 420c, 420d, 420e, 420f, 420g ).

When the outer cylinders 420a, 420b, 420c, 420d, 420e, 420f, and 420g are designed to have the same diameter, they are transmitted to the respective outer cylinders 420a, 420b, 420c, 420d, 420e, 420f, and 420g Can be uniformly dispersed. As another example, when the outer cylinders 420a, 420b, 420c, 420d, 420e, 420f, and 420g are designed to have different diameters, the external force can be distributed and transmitted in proportion to the size of the diameter.

The total sum of diameters of all the outer cylinders 420a, 420b, 420c, 420d, 420e, 420f, and 420g constituting the hydraulic jack 400a may be designed to be smaller than the diameter of the inner cylinder 411, The sum of the diameters of the outer cylinders 420a, 420b, 420c, 420d, 420e, 420f, 420g is preferably less than 1/3 of the diameter of the inner cylinder 411. [ When the diameter of the outer cylinder is larger than the diameter of the inner cylinder 411, a force smaller than the magnitude of the external force applied to the outer cylinder can be transmitted to the inner cylinder 411.

A specific operation principle of the hydraulic jack 400a according to another embodiment of the present invention will be described with reference to FIG.

11, the hydraulic jack 400a according to another embodiment of the present invention is shown to include three outer cylinders 420a, 420b, and 420c. However, as described above, FIG. 9 illustrates the hydraulic jack 400a of FIG. In a conceptual view for explaining the operation principle, the case where two external cylinders or four or more external cylinders are provided may be the same as or similar to the operation principle described later.

When the user lifts the pressure lever 430 in a state where the hydraulic jack 400a is in contact with an object at a lower portion of the object to be raised, the pressure pistons 421a, 421b, and 421c of the outer cylinders 420a, 420b, and 420c A negative pressure is formed in the outer cylinder 420. [ Accordingly, the working fluid stored between the main body 410 and the inner cylinder 411 can flow into the outer cylinders 420a, 420b and 420c along the suction pipes 451a, 451b and 451c.

Thereafter, when the user presses the pressure lever 430, the pressure pistons 421a, 421b, and 421c descend and apply pressure to the working fluid sucked into the outer cylinders 420a, 420b, and 420c. Accordingly, the working fluid sucked into the outer cylinders 420a, 420b, and 420c can move to the inner cylinder 411 along the supply pipes 452a, 452b, and 452c. The lift piston 412 rises by the pressure of the working fluid flowing into the inner cylinder 411. As the pressure of the inner cylinder 411 gradually increases, the lift piston 412 gradually rises, and the lift piston 412 is gradually lifted up by the pressure of the lift piston 430. As a result, 412) to lift the object placed on the top.

The hydraulic jack 400a according to another embodiment of the present invention controls the opening and closing of the shutoff valves 4511a, 4511b and 4511c and the shutoff valves 4511a, 4511b and 4511c installed at one end of the suction pipes 451a, 451b and 451c And may further include control means (not shown).

Control means (not shown) may be provided in the form of a control circuit disposed inside the fastening bracket 415, and may be electrically connected to the shutoff valves 4511a, 4511b, and 4511c. In this case, the control means (not shown) can open / close the shutoff valves 4511a, 4511b and 4511c in accordance with the user's operation.

The above formula (1) is a formula representing the force W exerted on the lifting piston 412. The lifting force W applied to the lifting piston 412 is a force acting on the lifting piston 412 against the diameter D of the lifting piston 412 The sum of the diameters d of the pistons 421a, 421b and 421c and the external force w applied to the pressure pistons 421a, 421b and 421c.

That is, when the user transmits a certain amount of external force w through the pressure lever 430 to the hydraulic jack 400, the lifting force of the lifting piston 412 is transmitted to the pressure piston 412 against the diameter D of the lifting piston 412 421a, 421b, and 421c, respectively. Here, the diameter D of the lifting piston 412 is determined according to the diameter of the inner cylinder 411, and the sum d of the diameters of the pressure pistons 421a, 421b and 421c is equal to the sum of the outer cylinders 420a, 420b and 420c The upward force W applied to the lifting piston 412 is determined by the ratio of the diameters of the outer cylinders 420a, 420b and 420c to the diameter of the inner cylinder 411 Can be varied.

Accordingly, the hydraulic jack 400a according to another embodiment of the present invention can selectively open / close the shutoff valves 4511a, 4511b, and 4511c by control means (not shown) It is possible to adjust the amount of the working fluid to be introduced and to increase the strength of the lifting piston 412 by applying pressure to the working fluid only through the pressure pistons 421a, 421b and 421c with the shutoff valves 4511a, 4511b and 4511c being opened .

For example, when only the first shut-off valve 4511a is closed in response to the user's control means (not shown), the external force applied to the working fluid acts when all the shut-off valve valves 4511a, 4511b and 4511c are opened Only two-thirds of the external force w applied to the fluid can be delivered. In other words, according to the control of the control means (not shown), the diameter of the outer cylinders 420a, 420b, and 420c is varied to control the lifting force W of the lifting piston 412, The lifting height of the hydraulic jack 400 according to one operation of the pressure lever 430 can be adjusted according to the type of object to be lifted or the type of work to be performed after the object is lifted.

In some other embodiments, the control means (not shown) may automatically determine the shutoff valve valves 4511a, 4511b, 4511c to be opened or closed.

For example, the control means (not shown) may only open one shutoff valve valve 4511a, 4511b, 4511c until the pressure lever 430 is operated a predetermined number of times from the initial operation time of the hydraulic jack 400a, It is possible to control the plurality of shutoff valve valves 4511a, 4511b, and 4511c to be opened from the time when the pressure lever 430 is operated more than the predetermined number of times. More specifically, the control means (not shown) allows only the first shut-off valve 4511a to be opened until the first presser lever 430 is operated five times, and until the pusher lever 430 is operated six to ten times The first shutoff valve 4511a and the second shutoff valve 4511b are opened and all the shutoff valves 4511a, 4511b and 4511c are opened from 11 times or more. In general, when the object is lifted using the hydraulic jack 400a, there are not many kinds of operations that can not be performed at a low height. Therefore, if the object is raised at a high speed in the early stage and then raised to a proper height, Need to be finely adjusted. At this time, according to the above-described features of the present invention, when only one shut-off valve is opened, the object is raised at a high speed in a comparatively short time, and then gradually increases as the number of shut- The rising speed can be reduced. Therefore, the user has the effect of varying the elevation height of the object even if the hydraulic jack 400a is always operated with a constant force.

As another example, the control means (not shown) can automatically determine the shutoff valve valves 4511a, 4511b, and 4511c to be opened or closed according to the weight of the object disposed above the hydraulic jack 400a.

To this end, the hydraulic jack 400a according to still another embodiment may further include weight sensing means (not shown).

The weight sensing means (not shown) senses the weight of the object disposed on the upper portion of the hydraulic jack 400a and transmits the sensed weight to a control means (not shown) It is possible to determine whether the shutoff valve valves 4511a, 4511b, and 4511c are opened or closed, respectively.

For example, if the control means (not shown) determines that the weight of the object is included in the first critical section, which is relatively light in weight, all of the shutoff valves 4511a, 4511b, 4511c are opened, It is possible to control the lift height of the hydraulic jack 400 according to the turning operation to be relatively low. On the other hand, if the control means (not shown) confirms that the object is included in the relatively heavy second critical section, the at least one shut-off valve 4511a, 4511b, 4511c is opened, It is possible to control the lift height of the hydraulic jack 400 to be relatively low. This is because when the weight of the object is relatively light, the object can be removed from the hydraulic jack 400a during the ascending process. If the weight of the object is relatively heavy, the possibility of leaving the hydraulic jack 400a during the ascending process is relatively low. This is because a lot of upward force is needed.

As described above, the hydraulic jack 400a according to another embodiment of the present invention can vary the lifting force of the lifting piston 412 according to the kind of the object, the type of work, etc., so that the efficient operation using the hydraulic jack 400a can be performed .

Fig. 12 is a view showing a schematic configuration of a goods transportation truck according to still another embodiment of the present invention.

The object transporting truck 40 according to another embodiment of the present invention includes a lower frame 100, a handle 200, at least one pillar 310, an upper frame 320, a hydraulic jack 400a, Prevention unit 700. [0035]

12, the lower frame 100, the handle 200, the at least one column 310, the upper frame 320, and the upper frame 320 constituting the goods transporting truck 40 according to another embodiment of the present invention, The hydraulic jack 400a is the same as the lower frame 100, the handle 200, the at least one column 310, the upper frame 320, or the hydraulic jack 400a shown in FIG. 4 or 8, It will be omitted.

The drop preventing portions 700 are respectively provided on both sides of the hydraulic jack 400 to support the upper frame 320 when the upper frame 320 is dropped to prevent the hydraulic jack 400 from being broken.

In one embodiment, the drop preventing portion 700 may include an elastic supporting portion 500 and a load dispersing portion 600.

13, the elastic supporter 500 is installed on the upper side of the load dispersing unit 600 to prevent the damper from colliding with the hydraulic jack 400 and damaging the hydraulic jack 400, A plurality of vibration absorbing parts 520, a plurality of connecting plates 530, a plurality of extension plates 540, and a plurality of vibration absorbing parts 540. The supporting parts 510, Four swivel portions 550 and two support bars 560. In the embodiment shown in FIG.

The support portion 510 includes a first plate 511, a second plate 512, a third plate 513, and a fourth plate 514 formed of an "a" shaped plate.

At this time, the first plate 511, the second plate 512, the third plate 513, and the fourth plate 514 are spaced apart from each other so as to face each other, And the vibration absorbing part 520 is installed in each of the spaced spaces to absorb the vibration transmitted to each plate.

The vibration absorbing part 520 is installed between each plate of the support part 510 and the other plate to absorb vibration.

In one embodiment, the vibration absorbing portion 520 may be formed by means of an elastic material such as a spring or rubber, which absorbs impacts. However, if the material absorbs shocks, Will be possible.

The connecting plate 530 is disposed between the upper portion of the first plate 511 and the upper portion of the second plate 512, between the front end of the second plate 512 and the front end of the third plate 513, Between the lower portion of the fourth plate 514 and the lower portion of the fourth plate 514 and between the front end of the fourth plate 514 and the front end of the first plate 511. The first plate 511, The second plate 512, the third plate 513 and the fourth plate 514 are connected and installed in a "+" form.

That is, the connecting plate 530 can form an overall appearance by interconnecting the upper, lower, or front ends of the respective plates, and at the same time, By adjusting the angle of connection, vibration or shock can be absorbed more efficiently.

That is, when the first plate 511, the second plate 512, the third plate 513 and the fourth plate 514 are fixed to each other by the connecting plate 530, However, if a critical vibration or a critical impact is applied, the coupling plate 530 connected to each plate can not be maintained, and the original function will not be able to be performed.

Accordingly, the connecting plate 530 according to the present invention can be manufactured by connecting the first plate 511, the second plate 512, the third plate 513, and the fourth plate 514 so as to be movable to some extent , It is possible to maintain the fastening effectively to the vibration or impact more than the case described above.

The extension plate 540 is connected to the upper end of the first plate 511 and the front end (i.e., the front end) of the first plate 511, the upper end and the front end of the second plate 512, And the lower portion of the fourth plate 514 and the upper portion or the lower portion from the front end.

In one embodiment, the extension plate 540 can be pivoted by connecting upper or lower portions to a pivot shaft formed at one side of the pivot portion 550.

In one embodiment, the extension plate 540 includes a second upper locking groove 5113 or a second upper locking groove 5113 so as to be able to slide in the vertical direction in the second upper locking groove 5113 or the second front locking groove 5115. [ A vertical sliding groove 541 (see FIG. 14) can be formed at a lower portion connected to the front end fastening groove 5115.

The pivoting unit 550 is connected to the upper or lower portions of the extension plates 540 extending from the respective plates so as to be opposed to and rotatable with respect to each other and installed on each inner side of the supporting bars 560 facing each other For example, using fastening means such as screw bolts, welding or rivets.

The support bar 560 is provided with an upper side or a lower side of the rotary part 550. The support bar 560 located on the upper side is spaced apart from the lower side of the upper frame 320, And is supported by the pivoting portion 550 to be spaced apart in the up-and-down direction, thereby providing the respective constructions of the resilient supporting portions 500.

When the upper frame 320 is dropped, the elastic support 500 having the above-described structure supports the upper frame 320 by using an elastic force, so that the fallable object collides with the hydraulic jack 400, Thereby preventing breakage.

14 is a view showing the first plate of Fig.

14, the first plate 511 includes a plate body 5111, two first upper engagement grooves 5112, a second upper engagement groove 5113, two first shear engagement grooves 5114, And a second shear locking groove 5115. [

The plate body 5111 is formed of an "a" shaped plate, and two first upper fastening grooves 5112 and a second upper fastening groove 5113 are formed in the upper blade, Shear fastening grooves 5114 and second shear fastening grooves 5115 are formed.

The first upper fastening groove 5112 is formed on the upper blade of the plate body 5111 formed in the upward direction and is connected to the front end of the connecting plate 530 so as to be rotatable.

The second upper fastening groove 5113 is formed between the first upper fastening groove 5112 and is connected to the lower portion of the extension plate 540 so as to be rotatable.

The first shear locking groove 5114 is formed at the front end of the plate body 5111 formed in the front end direction and is connected to the upper portion of the connecting plate 530 so as to be rotatable.

The second shear engagement groove 5115 is formed between the first shear engagement grooves 5114 and is connected to the lower end of the extension plate 540 so as to be rotatable.

In one embodiment, the extension plate 540 includes a second upper locking groove 5113 or a second upper locking groove 5113 so as to be able to slide in the vertical direction in the second upper locking groove 5113 or the second front locking groove 5115. [ A vertical sliding groove 541 can be formed at a lower portion connected to the front end fastening groove 5115.

The connection plate 530 may also have a sliding groove having the same structure as the sliding groove 541 of the extension plate 540 described above.

The first plate 511 having the above-described structure may be applied to the second plate 512, the third plate 513, or the fourth plate 514, Description of the second plate 512, the third plate 513, or the fourth plate 514 will be omitted.

The support bar 560 of FIG. 13 according to the present invention can be made of a plastic sheet having superior moldability and durability than a plastic sheet produced by using PET resin alone.

The plastic sheet according to the present invention is produced by the following method for producing a plastic sheet.

15, a method for producing a plastic sheet for producing a plastic sheet according to the present invention comprises: 100 parts by weight of a polyethylene terephthalate (PET) resin, 2 to 4 parts by weight of a polyurethane dispersant, 0.1 to 0.2 part by weight of polyethylene dioxythiophene polystyrene sulfonate, 3 to 5 parts by weight of polystyrolsulfonic acid, N-methyl-2-pyrrolidone, 0.1 to 0.3 parts by weight of triethylamine, 42 to 45 parts by weight of isopropyl alcohol and 50 to 52 parts by weight of water to prepare a mixed composition (S110); A second step (S120) of preheating the mixed composition; A third step (S130) of removing moisture from the preheated mixed composition; A fourth step (S140) of heating the moisture-removed mixed composition; A fifth step (S150) of removing foreign substances from the heated mixed composition; A sixth step (S160) of stretching the mixed composition from which the foreign substances have been removed while cooling it to produce a plastic sheet; And a seventh step (S170) of applying silicone to the plastic sheet and drying the plastic sheet.

The present invention can produce a plastic sheet having excellent moldability and durability by preheating, dehumidifying, heating and cooling by mixing various additives with conventional PET resin.

In the first step S110, as a mixing step of the raw materials, polyethylene terephthalate (PET) resin is used as a base resin, and a polyurethane dispersant, polyethylene dioxythiophene polystyrene sulfonate ), Polystyrolsulfonic acid, N-methyl-2-pyrrolidone, triethyl amine, isopropyl alcohol and water. .

The PET resin is a base resin, which has excellent thermal stability and high crystallinity, can be recycled, and is manufactured in a master batch form. The polyurethane dispersant functions to improve the compatibility with other components. Polyethylene dioxythiophene polystyrene sulfonate, polystyrolsulfonic acid, N-methyl-2-pyrrolidone, and triethyl amine. Function as an antistatic agent. Since the plastic sheet for producing the plastic container is generally an electrical insulator, static electricity is generated by friction charging, and if it is seriously damaged by discharge or electric conduction, it may lead to an accident such as explosion or fire, so it is preferable to add a charging agent . Isopropyl alcohol functions as an antifogging agent. The anti-fogging agent can inhibit the formation of water droplets due to the water vapor which may be generated when a plastic container is used to store a fruit or the like by using a plastic sheet.

In one embodiment, the above ingredients are mixed with 100 parts by weight of a polyethylene telephthalate (PET) resin, 2 to 4 parts by weight of a polyurethane dispersant, polyethylene dioxythiophene polystyrene sulfonate ), 0.4 to 0.6 parts by weight of polystyrolsulfonic acid, 3 to 5 parts by weight of N-methyl-2-pyrrolidone, 0.1 to 5 parts by weight of triethylamine amine in an amount of 0.1 to 0.3 part by weight, 42 to 45 parts by weight of isopropyl alcohol and 50 to 52 parts by weight of water. When added beyond the above-mentioned range, various problems may occur. Particularly, in the case of an antistatic agent, when mixed over the respective ranges, the plastic surface to be produced may be sticky, the sealing property and printability may be deteriorated, and in the case of white plastic, yellowing may occur.

In addition, the first step (S110) can further mix various additional components in the raw materials to enhance the functionality of the plastic sheet.

In one embodiment, the boron-based binder may be further mixed. The boron (B) type binder is used for bonding the respective components, and the boron type binder is preferably mixed in 2 to 10 parts by weight with respect to 100 parts by weight of the PET resin. When the content of the boron-based binder is less than 2 parts by weight, the raw material or the like can not be effectively bonded, and when the content of the boron-based binder exceeds 70 parts by weight, it is uneconomical.

In one embodiment, the garlic extract may be further mixed. The garlic extract is a natural adhesive component, which together with the boron-based binder functions as a binder which improves the compatibility with other constituents. The garlic extract is peeled and crushed, and 2 to 3 parts by weight of water is added per 1 part by weight of garlic. After heating at 80 to 100 캜 for 5 hours or more, the liquid component is extracted and filtered, The liquid component can be prepared by concentrating at 55 to 60 占 폚. The garlic extract is preferably mixed in 5 to 10 parts by weight with respect to 100 parts by weight of the PET resin. When the content of the garlic extract is less than 5 parts by weight, the raw material components may not be properly entangled so that the surface of the plastic sheet may not be uniformly formed. When the amount of the garlic extract is more than 10 parts by weight, There is a risk of degradation.

In one embodiment, the apatite powder may be further mixed. The apatite powder functions as a filler and can maintain the shape of the plastic sheet, thereby improving workability and improving strength and corrosion resistance. Apatite is an inorganic substance present in bone. It is important to use a small amount of particles, a high residual amount of carbonate, and low crystallinity for use as a filler. Preferably, the size of the apatite granules is 200 to 400 탆. For this purpose, it is important to carry out the sintering process at 500 to 700 ° C. When sintering at less than 500 ° C, there is a disadvantage in that the desired granule size and crystallinity can not be obtained. When sintering exceeds 700 ° C, there is a disadvantage in that the remaining amount of carbonate is low and the crystallinity becomes too high. The apatite powder is preferably mixed in 20 to 30 parts by weight with respect to 100 parts by weight of the PET resin. When the content of the apatite powder is less than 20 parts by weight, there is a disadvantage in that the adhesive strength is lowered, and when it exceeds 30 parts by weight, the impact resistance is weakened.

In one embodiment, the cork powder may be further mixed. Cork powder can improve the durability of the plastic sheet with apatite powder. The cork powder can be prepared by removing the shell of oak oak and then crushing it. For the cork powder to be mixed with the PET resin and the like, it is preferable to use fine pulverized particles which have been passed through a mesh of 400 mesh or more. The cork powder is preferably mixed in 15 to 25 parts by weight with respect to 100 parts by weight of the PET resin. When the cork powder is less than 15 parts by weight, improvement in durability is insignificant. When the cork powder is more than 25 parts by weight, porosity may be formed in the production of plastics, and durability may be lowered.

In one embodiment, the Sorghum extract can be further mixed. Sorghum extract not only acts as an antimicrobial agent but also inhibits the yellowing of white plastic sheets. Rumex crispus is a genus of Rumex spp. It is a perennial herb that grows well in moist places of various places. It uses the lysoon as a food in the private sector. In the oriental medicine, it is called a yosei, and it is categorized into various diseases including cystitis, gallbladder disease, bile secretion disorder, spleen disease, It is used as an adjuvant treatment for tumors and cancer. Sorghum extract extracted from Sora japonica has antimicrobial and antioxidant effects against various microorganisms. When mixed with a small amount of sulfur, it has an excellent effect on skin itching. It has been reported that saponins, tannins, flavonoids, essential oils and chrysophanol, and anthraquinone derivatives such as emodin, are known to be useful components of the present invention. The extracts of Sorae Seedlings were washed in 80% (v / v) methanol for 3 days as an extraction solvent by washing the collected Sorghum wells and then drying them on the shade and dividing them into the ground part (except the root) and the root part (root part) After soaking, the extract is filtered with a membrane filter (pore size 0.5 mu m) to separate the solid, and the methanol extract can be prepared by concentrating the extract at 50 DEG C using a rotary evaporator. It is preferable that the Sorghum extract is mixed in 3 to 8 parts by weight with respect to 100 parts by weight of the PET resin. When the content of the extract is less than 3 parts by weight, the antimicrobial activity is insufficient in preventing yellowing, and when it is more than 8 parts by weight, it is uneconomical.

The second step (S120) is a step of preheating the mixed composition, and heat is applied to the mixed material so that the materials are stably mixed.

The third step (S130) is a dehumidifying step for removing moisture present in the preheated mixed composition, and the desiccation is preferably performed in a temperature range of 150 to 180 ° C. If the amount is less than or more than the above range, the dehumidification may not be sufficiently performed, or the durability of the plastic may be adversely affected.

The fourth step (S140) is a step of heating the mixed composition from which moisture has been removed, and the heating temperature is preferably controlled to 260 to 270 ° C in order to melt and maintain the mixed composition.

The fifth step S150 is a step of removing foreign matter from the heated mixed composition. The foreign matter may be removed from the inside of the mixed composition by passing through a screen in the form of a mesh.

The sixth step (S160) is a step of cooling the mixed composition from which foreign matters have been removed to prepare a plastic sheet, which is then stretched in two stages using a cooling roll. The primary stretching takes place in the longitudinal direction through a chill roll maintained at 16-17 캜 and the secondary stretching takes place in the width direction (vertical direction in the longitudinal direction) through a cooling roll maintained at 20-23 캜. The reason for raising the temperature of the secondary elongation to be higher than the primary elongation temperature is to prevent the plasticizability of the solidified plastic sheet from being dried and to improve the durability and moldability of the plastic sheet by alternately stretching the longitudinal direction and the width direction .

The seventh step (S170) is a step of applying silicone to the plastic sheet and then drying it, so that the antistatic effect can be obtained while the silicone is applied and finished. It is preferable that silicone is applied using a diluted coating liquid in a concentration range of 5 to 25%, coated with silicone, and then dried at 160 to 215 캜. Further, it is preferable that the anti-fogging agent component is mixed with the silicone-containing coating liquid in order to suppress the water phenomenon formed in the produced plastic container.

Hereinafter, the structure and effects of the present invention will be described in more detail with reference to specific examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

[Examples and Comparative Examples]

After preparing a mixed composition according to the composition shown in the following Table 1, plastic sheets were prepared by preheating, dehumidifying, heating, removing foreign matter, cooling, stretching and drying to prepare Examples and Comparative Examples. For each material, commercially available materials were used, and garlic extract and Sorghum extract were prepared as described in the detailed description of the invention.

[Table 1]

[Experimental Example 1]

The compositions of Examples 1 to 3 and Comparative Examples were secondarily drawn to prepare a plastic sheet having a thickness of 10 mm, and the uniformity of the sheet surface was measured and reported in Table 2 below. At this time, the primary drawing was performed at 16 占 폚 and the secondary drawing was performed at 21 占 폚. The uniformity was measured using a laser sensor (N2 laser, oscillation wavelength 337.1 nm, UDHO Laser., Japan), and 30 points were randomly selected and their surface roughness was measured , A value equal to or less than 0.3 was considered to be uniform, and a value exceeding 0.3 was evaluated to be non-uniform. Here, Examples 1 to 3 were stretched in the transverse direction after stretching in the longitudinal direction, and stretched only in the longitudinal direction in the Comparative Example.

[Table 2]

As shown in Table 2, in Examples 1 to 3, uniformity was more excellent than Comparative Example.

[Experimental Example 2: Torsion Test]

The compositions of Examples 1 to 3 and Comparative Examples were secondarily stretched to prepare a plastic sheet having a thickness of 2 mm and then molded to produce 100 plastic products, and the completeness of the plastic sheets was evaluated. Here, Examples 1 to 3 were stretched in the transverse direction after stretching in the longitudinal direction, and stretched only in the longitudinal direction in the Comparative Example.

[Table 3]

As shown in Table 3, in the case of Examples 1 to 3, 90% or more of the normal product could be made, but the comparative example had a relatively high defect rate.

[Experimental Example 3: yellowing test]

The compositions of Examples 1 and 3 were secondarily stretched to prepare a plastic sheet having a thickness of 2 mm and then molded to prepare 100 white plastic products. Ten months later, discoloration was visually observed, . At this time, a part changed to yellow color was evaluated as poor.

[Table 4]

As shown in Table 4, in Example 3, it was confirmed that almost all the products were not discolored. On the other hand, Example 1 showed good results, but had a higher discoloration rate than Example 3.

[Experimental Example 4: Anti-Fogging Test]

The composition of Comparative Example and Example 3 was secondarily drawn to prepare a plastic sheet having a thickness of 2 mm and then molded to produce 100 white plastic products. The spinach was stored inside, and after one day, The results are shown in Table 5 below.

[Table 5]

As shown in Table 5, in the case of Example 3, almost no water droplets were formed, but in the comparative example, it was confirmed that water droplets enough to be visually recognized were formed.

The support bar 560 made of the above-described plastic sheet can be more excellent in moldability and durability than that produced by using PET resin alone.

Accordingly, when the support bar 560 is worn or damaged due to continuous vibration, it can be easily re-manufactured and replaced by using the above-described plastic sheet to ensure continuous use of the apparatus.

16, the load distributor 600 includes a ball housing 610 provided below the support portion 630 for supporting the lower side of the elastic supporter 500 and having a hollow portion 615 therein, A plurality of small balls 620 for support placed in the portion 615 and a ground ball 645 having a fixing bolt 646 extending upward from the center of the ground plane 645 and the ground plane 645 at the top, 640).

The load dispersing unit 600 can disperse the load applied from the outside and partially absorb the load, and can transmit the load q smaller than the load P externally applied.

The load dispersing unit 600 disperses the load applied from the outside of the ball housing 610 inside the ball housing 610 and finally transmits the load smaller than the load externally applied to the ball housing 610 . The load exerted from the outside of the ball housing 610 is dispersed by the plurality of small balls 620 for support and the ground ball 640 located in the hollow portion 615. Part of the load is applied to the ball housing 610 And the remaining load can be transmitted to the outside of the ball housing 610.

The ball housing 610 may be fixed to the surface using concrete or the like and may be provided with a hollow portion 615 in which a plurality of small balls 620 for support and a ground ball 640 are accommodated .

The ball housing 610 is made of a material having a certain strength such as iron, concrete, wood, plastic or the like in order to support a load dispersed by a plurality of small balls 620 for support and a ground ball 640 ≪ / RTI >

The shape of the ball housing 610 may be various shapes such as a polygonal shape and a spherical shape. However, the hollow portion 615 may be formed in a spherical shape corresponding to the shape of the ground ball 640.

The plurality of small balls 620 for support and the ground ball 640 may be accommodated in the hollow portion 615 and may be formed in a spherical shape.

The plurality of small balls 620 for support can be regularly arranged and received so as to abut each other along the outer circumferential surface of the hollow portion 615. The ground ball 640 may be received in the hollow portion 615 in a state of being put on a plurality of small balls for support 620 and may be supported in a point contact state with a plurality of small balls 620 for support.

The plurality of small balls 620 for support and the ground balls 640 are regularly arranged so that the outer circumferences thereof are in contact with each other. By the contact points between the plurality of small balls 620 for support and the ground balls 640, The external load may be dispersed while pressing the hollow portion 615, that is, the inner wall of the ball housing 610, finally disposed at the outermost position. In this embodiment, a plurality of small balls 620 for support are regularly arranged and the ground balls 640 are arranged on a plurality of small balls 620 for support to arrange a plurality of small balls for support The number of contact points between the ball 620 and the ground ball 640 can be increased and the load transmission can be regularized to enhance the load transfer effect between the balls. In addition, the ground ball 640 is supported in a point contact state by a plurality of small balls 620 for support, so that wear can be minimized.

The plurality of small balls for support 620 and the ground ball 640 may be made of a material having strength capable of withstanding a load due to a contact point between them and may be made of iron, have.

Meanwhile, the ground ball 640 may have a ground plane 645 on the top. A fixing bolt 646 is provided at the center of the ground plane 645 and inserted into the lower side of the supporting portion 630 to fix the supporting portion 630 to the ground ball 640.

At this time, the fixing bolt 646 may be formed in a non-patterned shape without forming a separate projection on the outer side, but may be formed in the lower side of the supporting portion 630 by forming a thread along the outer side surface It is preferable to tighten the bolts more strongly.

As described above, the load dispersing unit 600 is provided below the elastic supporting unit 500 to support the elastic supporting unit 500, thereby assuring the stability of the support of the upper frame 320 by the elastic supporting unit 500 can do.

It will be apparent to those skilled in the art that the above-described embodiments are for illustrative purposes only and that those skilled in the art will readily understand that other embodiments can be readily modified without departing from the spirit or essential characteristics of the embodiments described above You will understand. It is therefore to be understood that the above-described embodiments are to be considered in all respects only as illustrative and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

It is to be understood that the scope of the present invention is defined by the appended claims rather than the foregoing description and should be construed as including all changes and modifications that come within the meaning and range of equivalency of the claims, .

10, 20, 30, 40: goods conveyance truck 100: lower frame
110: shear frame 120: rear frame
121: sliding groove 130: intermediate frame
140: support plate 150; transportation
200: handle 210; The first vertical frame
220: second vertical frame 230: horizontal frame
240: Cramp 310: Column
320: upper frame 400, 400a: hydraulic jack
500: elastic support part 600: load distribution part
700: Drop prevention part

Claims (2)

A lower frame which is formed in the shape of a flat rectangular plate so that an object can be placed on the upper side thereof, a plurality of through holes formed through the upper and lower direction and a plurality of heaters are formed, And
And a handle which is formed in the shape of "P" and is fixedly installed after being slid in the left and right direction from the rear end of the lower frame,
The lower frame includes: a front end frame installed at a front end; A rear end frame spaced apart from the front end frame and provided at a rear end thereof; Three intermediate frames provided between the front end frame and the rear end frame on both sides in the longitudinal and longitudinal directions; And two support plates which are formed in a rectangular plate shape in which a plurality of through holes are formed by heat and are installed in two spaces formed by the three intermediate frames,
The rear end frame has a sliding groove formed in the left and right longitudinal direction at an upper portion thereof,
The handle may include: a first vertical frame installed at an upper side of the rear frame; A second vertical frame installed on the other side of the upper portion of the rear frame; And a horizontal frame extending from an upper side of the first vertical frame to an upper side of the second vertical frame so as to be held by a user,
The first vertical frame or the second vertical frame is slid downward along the sliding groove in the left and right directions and is fastened to one side or the other side of the rear frame by a bracket of the "
At least one column disposed on an upper surface of the lower frame and having a variable length; An upper frame supported by the at least one post and disposed in parallel with the lower frame to load the object on the upper side; And a hydraulic jack installed between the lower frame and the upper frame to elevate and lower the upper frame using an external force provided by a user to elevate and lower an object seated on the upper frame,
The hydraulic jack includes a main body in which a working fluid is stored and in which an inner cylinder and a lifting piston are disposed; A pressure piston provided outside the main body and communicating with the main body to maintain a closed state, and a pressure piston is formed inside the main body, and when the pressure piston is lowered after the working fluid is sucked as the pressure piston rises, An outer cylinder for providing a working fluid to the inner cylinder; A pressure lever connected to the pressure piston disposed inside the outer cylinder to transmit an external force provided by the user to the pressure piston; And a release valve releasing the pressure of the inner cylinder according to an operation of a user to return the working fluid introduced into the inner cylinder to the main body,
Wherein the plurality of outer cylinders are provided with a first outer cylinder formed along a central axis coaxial with the pressure lever and at least one second outer cylinder arranged along the diameter of the first outer cylinder, Wherein the sum of diameters of the first outer cylinder and the at least one second outer cylinder is 1/3 or less of the diameter of the inner cylinder,
Wherein the first outer cylinder and the at least one second outer cylinder are connected to the main body through an inflow pipe for introducing a working fluid stored in the main body,
Wherein the hydraulic jack further comprises control means for selectively opening and closing a plurality of inlet pipes formed in each of the first outer cylinder and the at least one second outer cylinder to vary the strength of the pressure piston.
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