KR100930085B1 - Transfer cart - Google Patents

Abstract

PURPOSE: A transfer cart is provided to control the height of a loading box automatically according to the weight of stack. CONSTITUTION: A transfer cart(100) comprises a base part(10), a loading part(20), a support unit(30), an elevating unit(50), and an air pressure control part. A transfer wheel(11) is installed to the base part. The loading part is installed in the upper part of the base part. The support unit supports the loading part against the base part to allow it to lift. The elevating unit is installed in the base part. The connection part or the loading part is lifted according to the weight of stack loaded on the loading part. The air pressure control part controls the down height of the loading part per unit weight of unit stack to be loaded according to the specific gravity of stack loaded on the loading part.

Description

Transfer cart {transfer cart}

The present invention relates to a transfer bogie, and more particularly, to a transfer bogie configured to automatically lower or lift a loading portion for loading a load according to the load of the load.

In general, the transport cart is for transporting a load, and includes a loading box for loading a load and a wheel for moving the loading box.

The transfer cart is formed in various sizes or shapes of the loading box according to the object to be loaded.

Transfer carts are also used in many different types of workplaces, often used to transport parts and tools to the workbench.

By the way, the conventional transport cart has a fixed height of the carrying box is fixed, when the user moves the load, there was an inconvenience to bend the waist or legs according to the loading height of the load.

In order to solve this problem, Korean Patent Publication No. 10-0306632 discloses a device for adjusting the height of a truck.

The conventional transport cart disclosed is to be able to adjust the height of the top plate by the pneumatic pressure entered through the operation of the push lever.

By the way, the transfer cart of the prior art has a problem that the efficiency of the work is reduced because the user must adjust the height of the top plate directly.

Therefore, there is a need for a transfer truck that can maximize the convenience of the operator by placing the loads at the same height regardless of the load of the loads. there was.

The present invention is to meet the above necessity, it is an object of the present invention to provide a transport cart that can maximize the convenience of work by automatically adjusting the height of the loading box according to the loading amount of the load.

The transport cart according to the present invention for achieving the above object is a base portion provided with a transfer wheel, a mounting portion which is installed to be spaced apart a predetermined distance upwards and the loading portion, and the loading portion is elevated relative to the base portion And a support unit supporting the support unit, wherein the support unit is connected to the loading unit and the base unit so as to elevate mutually, and the connecting unit is installed in the base unit and is connected to the connection unit or the loading unit according to the weight of the load loaded on the loading unit. Or lifting means for lowering or lifting the load.

Each of the connection parts includes two pivoting rods each of which is slidably coupled along a first direction in which a lower end extends in parallel with a longitudinal direction of the base part, and is rotatably coupled to each other in an X (X) shape. And first and second link members installed to be spaced apart from each other by a predetermined distance along a second direction crossing the first direction, and a rotation shaft member interconnecting intersection points of the rotation rods of the first and second link members. Lifting means is preferably connected to the rotating shaft member is formed to lower or lift the rotating shaft member.

And a guide member for guiding the lifting direction of the loading part so that the loading part does not flow in the front-rear direction or the left-right direction when the loading part is lowered or lifted, the guide member is fixed to the base part and extends in the vertical direction. A plurality of guide rods spaced apart from each other in the front-rear direction or the left-right direction, and a guide roller which is fixed to the loading section and rotates in contact with the outer circumferential surface of the guide rod when the loading section is lowered or lowered. It is preferable that the support groove in which the guide rod can be drawn in a predetermined depth in a shape corresponding to the outer circumferential surface of the rod is formed to extend in the circumferential direction.

In addition, the elevating means includes a pneumatic cylinder installed in the base portion to support the loading portion or the connection, the pneumatic cylinder is mounted on the base by the built-in air in the air state as a base and extending in the vertical direction inside And a cylinder body having an air inlet communicating with the elevating groove on one side of the lower portion thereof, and being installed to be able to elevate along the elevating groove on the cylinder body. The cylinder rod is provided with a groove, the upper end is supported on the upper surface of the spring mounting groove, the lower end is supported on the bottom surface of the cylinder body may include an elastic spring for elastically biasing the cylinder rod upwards, It is further provided with an air pressure control unit for adjusting the pressure, the air pressure control unit is connected to the cylinder body It may be provided with an extension pipe for providing an air movement path through which the air flowing in and out through the air inlet port, and a regulator for adjusting the internal pressure of the pneumatic cylinder is installed on one side of the extension pipe.

The transport cart according to the present invention has an advantage of maximizing the convenience of the operator because the height of the stacker is automatically adjusted according to the weight of the load being loaded.

Hereinafter, with reference to the accompanying drawings will be described in more detail the transport cart according to the present invention.

1 to 4 show a first embodiment of the transfer bogie 100 according to the invention.

Referring to the drawings, the transfer cart 100 includes a loading portion 20 for loading a load, a base portion 10 on which the transfer wheel 11 is installed, and a loading portion 20 with respect to the base portion 10. It is provided with a support unit 30 for supporting the lifting in accordance with the weight of.

The base portion 10 is provided with a transfer wheel 11 on the lower surface, in this embodiment, the transfer wheel 11 is applied as a directional caster, the transfer wheel 11 is used in addition to the environment or load of the place of use Various wheels can be applied depending on the type.

In addition, the handle 12 is coupled to the rear of the base portion 10, the handle 12 is two vertical bars 13 and a vertical bar 13 extending a predetermined length upward from the rear of the base portion 10, 13 Including the holding member 14 to interconnect the two vertical bars 13 at the top of the), the operator is to hold the holding member 14 and to easily move the transport cart (100).

On the upper surface of the base portion 10, the lower guide rails 15 are installed at both edges so as to extend along the longitudinal direction (hereinafter referred to as the first direction 1) of the base portion 10, and the lower guide rails 15 ) Is provided four at each of the front and rear sides of the base portion 10, respectively.

The upper portion of the lower guide rail 15 is formed so that the buffer member 16 protrudes a predetermined length upward, the buffer member 16 is a loading portion when the loading portion 20 to be described later is lowered by the loading of the load; It is for alleviating the impact applied to the mounting portion 20 in contact with the lower surface of the (20).

In the center of the upper surface of the base portion 10, the elevating means 50 of the support unit 30 described later is provided.

The loading part 20 is installed on the upper part of the base part 10 and provides a loading space in which loads are loaded. Like the base part 10, the upper part guide rails 21 are provided at both front and rear sides of the lower part. It is formed to extend along the direction (1).

Since the loading part 20 of the present embodiment is to load a plate, there is no separate separation preventing member installed on the upper surface, but the rolling part moves from the loading part 20 when the transfer cart 100 moves like a roller or a spherical member. When used to load the load that may be separated may be formed a separate edge along the edge, in addition to the shape or shape of the load 20 may be variously formed according to the characteristics of the load.

The support unit 30 supports the mounting portion 20 to be elevated relative to the base portion 10, and the connecting portion 31 supporting the base portion 10 and the loading portion 20 spaced apart in the vertical direction. It is coupled to the connection portion 31 includes a lifting means 50 for lowering or lifting the loading unit 20.

The connecting portion 31 includes first to fourth link members 32, 33, 37, and 38 and a rotation shaft member 36, wherein the first and second link members 32 and 33 are rotated so as to be rotatable. (X) has a rotating rod (34) coupled to intersect in a shape and is formed on the upper surface of the base portion 10 so as to be spaced apart at predetermined intervals along a second direction (2) orthogonal to the first direction (1). .

A roller member 35 is coupled to the lower end of each pivot rod 34, and the roller member 35 is coupled to the lower guide rails 15 so as to be slidable along the first direction 1.

Accordingly, the first and second link members 32 and 33 are rotated at the intersections of the respective rotation rods 34 so that the lower ends slide in a direction away from or near each other along the guide rails. The height will be lowered or raised.

The pivot shaft member 36 is provided to extend along the second direction 2 to interconnect the intersections of the pivot rods 34 of the first and second link members 32 and 33.

The third and fourth link members 37 and 38 are coupled to the first and second link members 32 and 33, respectively, and the third link member 37 has a lower end of the first link member 32, respectively. And two coupling rods 39 rotatably coupled to the upper ends of the rotation rods 34 and hinged to each other in an X-shape, and the fourth link member 38 also includes a rotation rod of the second link member 33. The upper end of the 34 is provided with a coupling rod 39, the lower end of which is rotatably coupled and hinged in mutual X-shape.

In addition, the reinforcing member extending along the second direction 2 to interconnect the coupling portions of the first and third link members 32 and 37 and the coupling portions of the second and fourth link members 33 and 38. 40 is provided, between the first and third link members 32 and 37 and the second and fourth link members 33 and 38 when a load is loaded on the mounting portion 20 to receive a load downward. Make sure that the separation distance is kept constant.

The coupling rods 39 of the third and fourth link members 37 and 38 are also provided with roller members 35 at their upper ends, and slide on the upper guide rails 21 installed at the lower surface of the loading part 20. Possibly combined.

The elevating means 50 is to lower or elevate the loading unit 20 according to the weight of the load loaded on the loading unit 20. The lifting unit 50 is installed on the upper surface of the base unit 10 as described above, and the upper end of the rotating shaft member ( A hydraulic shock absorber 51 supporting the 36 and a compression spring 56 installed on the hydraulic shock absorber 51 are included.

The hydraulic shobar 51 is formed on the upper end of the cylinder 52 installed in the base portion 10, the pullout rod 53 coupled to the cylinder 52 so as to be pulled out upward, and the top of the pullout rod 53. A contact portion 54 in contact with the member 36.

The compression spring 56 surrounds the lead rod 53 and the upper and lower ends thereof are supported by the contact portion 54 and the cylinder 52, respectively, so that the lead rod 53 is maintained in the drawn state from the cylinder 52. Let's do it.

On one side of the cylinder 52 is provided with an adjustment lever 55 for adjusting the damping force of the hydraulic shock absorber 51, through the control lever 55 to expand or narrow the flow path of the fluid moving in the cylinder 52 By adjusting the damping force of the hydraulic shock absorber 51, the damping force of the hydraulic shock absorber 51 is appropriately adjusted according to the specific gravity of the load to be loaded.

That is, in the case of metals such as iron, the damping force is increased because the specific gravity is large, and the damping force is lowered in the case of a load formed of a material having a relatively low specific gravity such as plastic.

For example, when the metal roller and the plastic roller of the same volume each have a weight of 1 kg per metal roller and 0.2 kg of plastic roller, when the loads are loaded into the loading part 20, 100 metal rollers are 100 kg But 100 plastic rollers are only 20kg.

Therefore, assuming that the damping force is set equally and that the same number of metal rollers and plastic rollers are loaded in the stacking section 20, the stacking section 20 on which the metal rollers are loaded is drastically lowered than when the plastic rollers are stacked. .

Therefore, it is necessary to adjust the damping force in order to make the falling speed of the loading part 20 which the operator can easily work regardless of the kind or specific gravity of the load.

The adjusting lever 55 for adjusting the damping force of the showbar 51 extends toward the handle 12 through extension rods 62 connected by the universal joint 61, and is the last end supported by the handle 12. The extension rod 62 is provided with a rotation lever 63, so that the operator can rotate the rotation lever 63 to appropriately adjust the damping force of the show bar 51.

Preferably, a number or a separate mark for displaying the magnitude of the damping force is displayed on the rotary lever 63, and a reference point that is a reference to the handle 12 is displayed to indicate the magnitude of the damping force through the numerical display corresponding to the reference point. It can be easily identified by the operator.

In this embodiment, as the elevating means 50, the hydraulic shock absorber 51 and the compression spring 56 is applied, but unlike the pneumatic shock absorber may be applied, that is, not to convey various loads, that is, one kind of product However, if only the material is transported, it is not necessary to adjust the damping force separately, so it can be installed as a shock absorber member without damping force adjusting function.

In addition, the lifting means 50 may be formed to lower or raise the loading unit 20 only by the elastic force of the compression spring 56 without having a show bar. In this case, the damping force cannot be adjusted, but when the load is loaded, the compression spring 56 is compressed by the load applied from the load 20 so that the load 20 is lowered, and the load 20 is removed by removing the load. When the load applied to the load becomes smaller, the loading unit 20 is elevated by the elastic restoring force of the compression spring 56.

Referring to the driving process of the feed cart 100 of the present embodiment are as follows.

First, the operator appropriately adjusts the damping force of the showbar 51 in accordance with the specific gravity of the load to be loaded via the rotary lever 63, and then loads the load to the loading unit 20.

The support unit 30 lowers the loading unit 20 according to the load of the load loaded on the loading unit 20, and is coupled to the loading unit 20 as the load of the load applied to the loading unit 20 increases. The upper end of the coupling rod 39 and the lower end of the rotation rod 34 coupled to the base portion 10 is slid along the first direction 1 so as to be far from each other, the rotation rod 34 and the coupling rod 39 By the rotation of the loading unit 20 is gradually lowered.

Therefore, even if the load is continuously loaded, the height of loading the load on the loading unit 20 is kept constant so that the operator can conveniently perform the work.

When unloading the load by moving the transfer cart 100, the operator unloads from the topmost load, the load applied to the loading unit 20 is reduced every time the load is unloaded, so that the compression spring 56 The loading unit 20 is gradually raised by the elastic restoring force.

In more detail, the compression spring 56 causes the compression spring 56 to pull out the lead rod 53 of the showbar 51 upward by the elastic restoring force of the compression spring 56, and the contact portion 54 upwards the pivot shaft rod. Will be pushed up.

Since the pivot shaft rods connect the intersection points of the pivot rods 34 of the first and second link members 32 and 33, the intersection of the pivot rods 34 also moves upward as the pivot shaft rods are elevated. And, the upper and lower ends of the rotation rods 34 are moved in a direction closer to each other.

Since the upper ends of the rotation rods 34 are adjacent to each other, the coupling rod 39 also rotates so that the lower and upper ends thereof are adjacent to each other, and the loading unit 20 is gradually raised and lowered through this process.

Thus, since the height of the loading part 20 is lowered or raised according to the load of the loaded goods, the transport cart 100 according to the present embodiment has a predetermined height regardless of the amount of the load loaded on the loading part 20. Since it is located, when the worker loads or unloads the load or removes the loads one by one, the height of the uppermost load loaded on the loading unit 20 can be kept constant, thereby maximizing work convenience. do.

5 shows a second embodiment of the transport cart 200, the transport cart 200 of the present embodiment includes a guide member 70 protruding upward along the upper edge of the base portion 10.

The guide member 70 flows along the second direction 2 during the lowering or lifting of the loading unit 20 so that the load is separated or damaged by the first to fourth link members 32, 33, 37, and 38. In order to prevent this from happening, the loading part 20 guides the lifting direction so that the lifting part 20 can be lowered and raised along the vertical direction.

In addition, the guide member 70 is formed so that the height of the upper end is relatively higher than the height when the mounting portion 20 is located at the top by the support unit 30, the roller or the Loading spherical members prevents the load from leaving.

In the present exemplary embodiment, the guide member 70 has a rectangular pillar shape in which an upper surface extending continuously along the upper edge of the base portion 10 is open. Alternatively, a plurality of unit members may be used to define the edge of the base portion 10. Therefore, it may be installed to be spaced apart from each other by a predetermined interval.

And when the load is a plate shape that does not have a possibility of detachment because the guide member only need to guide the lifting direction of the mounting portion 20 may be formed to extend a predetermined length on each side of the base portion 10, respectively.

The guide member may be formed by attaching a separate member, but the vertical bar 13 of the handle 12 extends from both sides of the base 10 material, respectively, so that the loading part 20 is provided by the vertical bar 13. The lifting direction of may be guided.

The remaining components of the embodiment shown in FIG. 5 are the same in form and function as the components of the embodiment shown in FIGS.

6 to 9 illustrate a third embodiment of the feed cart 300.

Referring to the drawings, the transport cart 300 of the present embodiment is the base portion 310, the loading portion 320, the connecting portion 31, the loading portion (connecting the base portion 310 and the loading portion 320 mutually) Lifting means 330 for lowering and lifting the 320 and the guide member 360 for guiding the lifting direction of the stacking portion (320).

The base portion 310 has a transfer wheel 311 is mounted on the lower surface, the pneumatic cylinder 331 of the elevating means 330 to be described later is mounted on the upper surface.

In addition, four lower roller guide grooves 312 are formed in the upper surface of the base portion 310 downwardly and are extended in the front-rear direction. The width of the lower roller guide grooves 312 is defined by the connection portion 31. It is formed to correspond to the width of the roller member mounted on the rotation rod (34).

The roller member is limited in the moving direction and the moving distance by the lower roller guide groove (312). Base portion 310 of the present embodiment has the advantage that the structure is simple and easy to manufacture because the guide rail for guiding the roller member is not separately installed as in the first embodiment.

A stopper 313 is provided at four corners of the upper portion of the base portion 310, and the stopper 313 is provided with a first rod 314 and a second rod 315 which can be elevated in and out of the first rod 314. ) And a compression spring 316 surrounding the outer circumferential surface of the second rod 315.

The compression spring 316 has a lower end supported by the upper end surface of the first rod 314, and an upper end supported by the contact portion provided at the upper end of the second rod 315.

Accordingly, when the loading part 320 is lowered, the lower end of the loading part 320 contacts the contact part to alleviate the shock applied to the pneumatic cylinder 331 described later due to the lowering of the loading part 320, thereby preventing damage. When the loading unit 320 is lifted and lifted again by the pressure of the air contained in the pneumatic cylinder 331, the restoring force by the compression spring 316 is prevented. To help the ascent to 320).

The loading part 320 is installed to be supported by the connection part 31 spaced upwards from the base part 310 by a predetermined distance. Although not shown, the loading part 320 guides the roller member of the connection part 31. The upper roller guide groove is formed, the cargo is loaded on the upper surface of the loading portion (320).

In addition, a plurality of coupling grooves 321 are formed on the upper surface of the loading part 320, which is for fastening the release preventing plates 322.

When the cargo to be loaded is formed in a ball or a cylindrical shape and rolls and moves from the upper part of the loading part 320, the cargo may be separated from the loading part 320, so that the release preventing plate 322 may be removed from the loading part 320. Tighten to the top to prevent the departure of cargo.

Of course, if there is no possibility that the cargo loaded on the loading unit 320 is not separated from the loading unit 320 without installing the separation prevention plate 322, the separation prevention plate 322 may be separated and stored separately. Therefore, only the front and rear of the mounting portion 320 may be installed to prevent the departure prevention plate 322 or the left and right side separation prevention plate may be installed.

Since the connection part 31 has the same structure as the connection part 31 of the first embodiment, the same reference numerals are used, and detailed description thereof will be omitted.

Guide member 360 of the present embodiment, when the loading portion 320 is lifted by the connecting portion 31 and the lifting means 330 to be described later, the loading portion (320) so as not to flow in the front and rear or left and right directions ( It is for guiding the lifting direction of 320).

The guide member 360 includes two guide rods 361 extending upward from the base portion 310, and guide rollers 363 installed on the loading part 320 and lowered and elevated along the guide rods 361. Include.

The guide rod 361 has a lower end fixed to the base portion 310 and extends in a vertical direction, respectively, and extends adjacent to the left and right sides of the loading part 320.

The upper end of the guide rod 361 is extended to correspond to the highest point where the loading unit 320 is located in the absence of cargo loaded on the loading unit 320, the connecting rod connecting the upper end of the guide rod 361 A 362 is provided so that the worker grasps when the transfer rod 300 is moved by using the connection rod 362 as a handle.

The guide rollers 363 are rotatably installed in the roller housings 365 which are fixed to the lower part of the loading part 320. Each of the guide rollers 363 is provided with the inner surfaces of the guide rods 361 facing each other. It is supposed to be in contact.

Since the two guide rollers 363 are respectively fixed to the loading part 320 to rotate along the guide rod 361, the guide part 361 does not flow in the left and right directions during the lowering or lifting of the loading part 320. It is possible to stably move up and down along the up and down extension direction.

And the outer circumferential surface of the guide roller 363 is formed with a support groove 364 extending in the circumferential direction.

The support groove 364 is to allow the guide rod 361 to be inserted a predetermined depth toward the center of rotation of the guide roller 363 corresponding to the shape of the guide rod 361.

In the present embodiment, since the guide rod 361 is formed in a cylindrical shape, the support groove 364 is formed in a semicircular cross section, and the guide roller 363 is inserted into the support groove 364. ) Moves along the guide rod 361 so that the loading part 320 is prevented from flowing in the front-rear direction as well as in the left-right direction in the process of descending or lifting.

In the present embodiment, the guide rod 361 is cylindrical and the support groove 364 is also formed as a groove having a U-shaped cross section corresponding thereto, but the guide rod 361 may be formed in a prismatic shape. In addition, the support groove 364 corresponds to the shape of the guide roller 363 so that the guide roller 363 can be rotated with the guide rod 361 inserted in a predetermined depth toward the center of rotation of the guide roller 363. It can be formed in various forms.

Lifting means 330 of the present embodiment is a pneumatic cylinder 331 for supporting the rotating shaft member 36 of the connecting portion 31, and an air pressure control unit 350 for adjusting the pressure in the pneumatic cylinder 331 Include.

The pneumatic cylinder 331 includes a cylinder body 331, a cylinder rod 336 mounted to the cylinder body 331 to be elevated, and an elastic spring 341 for elastically biasing the cylinder rod 336 upwards. Inside the pneumatic cylinder 331, air in the atmospheric state is incorporated.

Thus, the pneumatic cylinder 331 of the present embodiment has an environment-friendly configuration because there is no possibility of contamination due to the leakage of oil or gas components that can cause environmental pollution because it is driven using the air in the atmosphere.

The cylinder body 331 is fixed to the base portion 310, and is provided with a lifting groove 333 that is drawn downward on the upper surface. In addition, an air inlet 334 communicating with the lifting groove 333 and the outside is formed at one lower side of the cylinder body 331.

The cylinder rod 336 is inserted into the elevating groove 333 and is elevated. The piston 338 is elevated in the elevating groove 333 at the lower end thereof. The cylinder rod 336 is in contact with the rotating shaft member 36 at the upper end thereof. The shaft support part 339 which supports the member 36 is provided.

The piston 338 is provided with an O-ring 340 and a U-packing 340a for blocking the movement of air between the upper and lower portions of the lifting groove 333 around the piston 338, The O-ring 340 is also provided in the cylinder body 331 at the contact portion with the cylinder rod 336. The cylinder rod 336 is formed with a spring mounting groove 337 which is drawn upward on the lower surface.

The elastic spring 341 is for elastically biasing the cylinder rod 336 upwards and is installed inside the cylinder body 331 and the cylinder rod 336.

That is, the elastic spring 341 is applied to the compression spring 316, the lower end is supported on the bottom surface of the lifting groove 333 of the cylinder body 331, the upper end of the spring mounting groove of the cylinder rod 336 ( 337) It is installed in the vertical direction to be supported by the top surface.

When the load is loaded on the loading unit 320 and the cylinder rod 336 is lowered, the elastic spring 341 is compressed. When the load disappears, the cylinder rod 336 is upward again by the restoring force of the elastic spring 341. While moving up and down, the rotating shaft member 36 is pushed upward.

Generally, in the pneumatic cylinder, a spring for elevating the cylinder rod 336 upwards is often installed to surround the outer circumferential surface of the rod. In this case, the upper end of the spring is supported by the upper end of the rod, and the lower end is attached to the upper end of the cylinder body. Supported.

However, in the structure of such a general pneumatic cylinder, for example, if a spring having a length of 100 cm needs to be used in consideration of the restoring force or elastic force required of the spring, the spring can be installed only when the length of the rod extending upward from the cylinder body is 100 cm. As a result, the space in which the rod can be lowered and inserted must be increased, so the length of the cylinder body must also be increased, so the total length of the pneumatic cylinder must be 200 cm or more.

On the other hand, in the pneumatic cylinder 331 of the present invention, the elastic spring 341 is installed inside the cylinder body 331, and in particular, the spring mounting groove 337 extending upward in the cylinder rod 336 is formed, the elastic spring The length of the cylinder rod 336 and the entire cylinder body 331 can be reduced than when the 341 is installed to surround the outer circumferential surface of the cylinder rod 336.

By lowering the height of the pneumatic cylinder 331, it is possible to lower the installation height of the rotating shaft member 36 supported by the pneumatic cylinder 331, so that the installation height of the loading part 320 can be prevented from being too high. In designing and manufacturing, there is an advantage in that it is possible to both increase or decrease the height of the loading part 320 as necessary.

The air pressure control unit 350 is for adjusting the height of the lowering of the loading unit 320 in accordance with the weight of the cargo to be loaded by adjusting the pressure inside the cylinder body 331.

Even if the cargo of the same weight, the bulky load should have a longer falling length of the loading unit 320, on the contrary, the smaller load should have a shorter falling length of the loading unit 320 so that the worker carries or uses the loaded cargo. Because it is easier to work with.

The air pressure regulating unit 350 includes an extension pipe 351 and a regulator 352 installed on one side of the extension pipe 351.

The extension pipe 351 is installed to communicate with the air inlet 334 in the cylinder body 331, and provides a movement path through which the air discharged from the inside of the cylinder body 331 moves through the air inlet 334.

And one side of the extension pipe 351 is provided with a regulator 352, as shown in Figure 6 regulator 352 is fixed to one side of the edge of the base portion 310 to facilitate the operator's operation for pressure adjustment have.

Of course, the installation position of the regulator 352 may be selectively installed at various points convenient for operation to increase the operability of the operator, the extension pipe 351 can also adjust the extension direction correspondingly.

The end of the extension pipe 351 further extended from the regulator 352 is used as a storage tank of air used for pressure control inside the cylinder body 331 by the regulator 352.

The process of descending and elevating the loading unit 320 by the elevating means 330 is as follows.

When the load is loaded on the loading unit 320, the cylinder rod 336 is lowered by the weight of the load, and thus the connection part 31 connecting the base part 310 and the loading part 320 is also linked. The loading unit 320 is rotated to allow the lowering.

When the cylinder rod 336 is lowered, air at the lower part of the piston 338 is discharged to the connecting pipe through the air inlet 334, and the upper part of the piston 338 is maintained in a vacuum state due to the lowering of the piston 338. do.

At this time, since the pressure inside the cylinder body is regulated by the regulator 352, the falling height at which the cylinder rod 336 falls with respect to the same load according to the pressure adjusted by the regulator 352 may be set differently.

Subsequently, when the loaded cargo is removed and the load gradually decreases, the cylinder rod 336 is raised upward by the restoring force of the elastic spring 341 and the internal residual pressure of the pneumatic cylinder 331, and the air inlet 334 The air discharged through the gas flows back into the cylinder.

Thus, the transport cart 300 of the present embodiment is to adjust the falling distance of the loading unit 320 per unit weight according to the specific gravity of the cargo to be loaded through the air pressure control unit 350 can increase the work efficiency of the operator, the guide Since the loading part 320 does not flow in the front-rear and left-right directions in the process of descending or lifting by the member 360, the cargo may be stably lifted.

1 is a perspective view showing a first embodiment of a transport cart according to the present invention;

Figure 2 is an exploded perspective view showing the loading portion and the connecting portion of FIG.

3 is a partial excerpt perspective view showing the base of FIG.

4 is a cross-sectional view of the feed cart of FIG.

5 is a partially cutaway perspective view showing a second embodiment of a feed cart having a guide member;

6 is a partially cutaway perspective view showing a third embodiment of the feed cart;

7 is a partial excerpt perspective view showing a guide member of a third embodiment;

8 is a front view illustrating a state in which the guide member of FIG. 7 is supported by a guide rod;

Fig. 9 is a partially cutaway front view showing the lifting means of the third embodiment.

<Explanation of symbols for the main parts of the drawings>

100; Transport bogie

10; Base part

20; Loading section

30; Support unit

31; Connection

50; Lifting means

70; Guide member

Claims (5)

A base part provided with a transfer wheel; A loading unit installed to be spaced apart a predetermined distance upward from the base unit and configured to load a load; And a support unit for supporting the loading unit to be elevated relative to the base unit. The support unit is slidably coupled in a first direction, the lower end of which extends in parallel with the longitudinal direction of the base part, and two rotating rods that are rotatably coupled to each other in an X (X) shape. And a rotational shaft configured to interconnect the first and second link members and the intersection points of the rotation rods of the first and second link members, the first and second link members being installed to be spaced apart from each other along a second direction crossing the first direction. A connecting part including a member to connect with each other so that the loading part and the base part can be elevated; It is installed on the base portion is connected to the connecting portion or the loading portion to lower or lift the connecting portion or the loading portion in accordance with the weight of the load loaded on the loading portion, mounted on the base portion and extending in the vertical direction inside A groove is formed, and a cylinder body having an air inlet communicating with the lifting groove at one lower side thereof, and being installed to be liftable along the lifting groove on the cylinder body, has an upper end supporting the connection part or the loading part and upwards from the lower part. A cylinder rod provided with a spring mounting groove extending a predetermined depth, and an upper end is supported on the upper surface of the spring mounting groove, the lower end is supported on the bottom surface of the cylinder body and has an elastic spring to elastically bias the cylinder rod upwards. Compression in the cylinder body without power from an external power source And a pneumatic cylinder for supporting the loading part at a predetermined distance from the base part through a balance between the pressure of the air and the force between the elastic force of the elastic spring and the load of the load loaded on the loading part. Lifting means and According to the specific gravity of the load to be loaded in the loading unit is provided with an air pressure control unit for adjusting the pressure in the cylinder body in order to adjust the height of the lowering of the loading unit per unit weight of the load to be loaded, The air pressure control unit is connected to the cylinder body at one end thereof to provide an air movement path through which air flows in and out through the air inlet, and is installed at one side of the extension tube to adjust the internal pressure of the pneumatic cylinder. Transfer cart characterized in that it comprises a regulator. delete The method of claim 1, A detachment prevention plate that is detachably installed on an upper surface of the loading unit and prevents the load from being separated from the loading unit when the loading of the load capable of rolling motion; A first rod installed at four upper edges of the base portion so as to extend in an up and down direction, and installed to be liftable into the interior of the first rod, and having an upper end configured to be in contact with a lower surface of the loading portion loaded with a load; A second rod is wrapped around an outer circumferential surface of the second rod, and a lower end thereof is supported by an upper end surface of the first rod and an upper end thereof is supported by a lower surface of a contact portion provided at an upper end of the second rod. 1, a stopper including a compression spring elastically biased so as to remain drawn out from the top of the rod, Further provided with a guide member for guiding the lifting direction of the loading unit to move up and down, without flowing in the front and rear or left and right directions when the loading unit is lowered or raised, The guide member is fixed to the base portion extends in the vertical direction and is spaced apart from each other in the front-rear direction or the left-right direction of the mounting portion, and is fixed to the loading portion, when the It includes a guide roller that rotates in contact with the outer peripheral surface of the guide rod, And a support groove on the outer circumferential surface of the guide roller that is formed to extend along the circumferential direction so that the support groove into which the guide rod can be inserted in a predetermined depth has a shape corresponding to the outer circumferential surface of the guide rod. delete delete

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