KR20050041292A - Balance apparatus for cart - Google Patents

Abstract

The present invention relates to a balance maintaining device to maintain the balance of the carrier portion of the cart even if the ground shakes uneven while the cart is moving, in particular the balance maintaining device according to the present invention can be used as an auxiliary wheel of a conventional wheelbarrow In this case, stable driving is possible even in a path with a lot of obstacles, and when a means for adjusting wheel spacing is further provided, a stable stop is possible.

Balance maintenance device according to the invention is installed on the frame of the cart, the connecting means having a rotating shaft; wheel; An upper end rotatably connected to a rotation shaft of the connecting means, and a support connected to the lower end of the wheel; And a rotation angle limiting means of the support, which is moved around the rotation axis of the connecting means.

Description

BALANCE APPARATUS FOR CART}

The present invention relates to a balance maintaining device to maintain the balance of the carrier portion of the cart even if the ground shakes uneven while the cart is moving, in particular the balance maintaining device according to the present invention can be used as an auxiliary wheel of a conventional wheelbarrow In this case, stable driving is possible even in a path with a lot of obstacles, and when a means for adjusting wheel spacing is further provided, a stable stop is possible.

As shown in FIG. 1, in which only the skeleton is omitted, the conventional wheelbarrow 200 having a wheel 210 in the front and two stops 220 in the rear is a barn, a furrow, a farm road, or the like. It is convenient to move the narrow passage. However, if the load is heavy and heavy, or if the type of load is fluid, such as water, the load of the cart will be biased to one side as the cart moves through uneven passageways or obstacles with obstacles. It's hard to keep and driving a wagon isn't easy.

Crop cultivation using a greenhouse (aka 'vinyl house') is widely used to supply fruits and vegetables regardless of the season, and the chemical solution is applied to the wheelbarrow 200 as shown in FIG. A chemical liquid spreading device has been developed in which a tank and a pumping means are mounted to spray the chemical liquid to a crop through a nozzle.

Examples of the conventional chemical liquid spraying apparatus using a wheelbarrow, Republic of Korea Patent Registration No. 0271433 (2000.08.16.) Developed and filed by the inventor of the present invention 『Valet House Sprayer for Vinyl Houses』 and Republic of Korea Utility Model Registration No. 0257505 Korean Utility Model Registration No. 014205 (1999.03.06.), `` Spray Working Machine '', Utility Model Publication No. 2000-0018785 (2000. 10.25.) Grape pesticide spreaders.

However, the use of the wheelbarrow 200 as shown in FIG. 1 of the conventional chemical liquid spraying device still has a problem that it is difficult to balance the wheelbarrow on the road.

In addition to the wheelbarrow shown in FIG. 1, in the case of two wheels, three wheels, or four wheels, there is a constraint that a relatively wide passage for a wheel gap is required to move.

In addition, the chemical spraying device using a wheel or two wheels, three wheels or four wheels as described above is spraying the chemical liquid using a plurality of nozzles arranged on a certain portion of the nozzle block fixed to both sides of the cart, the passage is uneven, the cart Tilted to either side, the nozzles may collide with the crops and damage the crops. Even if the crop is not damaged, the nozzle stem is inclined to one side, so that the nozzle is too close to the crop and the chemical liquid is not evenly sprayed.

The present invention has been proposed to solve the problems of the conventional wheelbarrow as described above, in particular the problem with the chemical spraying apparatus using a conventional wheelbarrow.

Accordingly, the present invention is provided with a rotating shaft on a portion connected to the cart, and the object is to provide a balance maintaining device that is rotated on the rotating shaft and provided with a support having a wheel and a means for limiting the rotation angle of the support. do.

In addition, an object of the present invention is to provide a spacing control means capable of opening and closing two supports when the wheel and the support of the balance maintaining device are two each.

In order to achieve the above object, the balance maintaining device according to the present invention is installed on a frame of a wheelbarrow and has a rotation shaft; wheel; An upper end rotatably connected to a rotation shaft of the connecting means, and a support connected to the lower end of the wheel; And a rotation angle limiting means of the support, which is moved around the rotation axis of the connecting means.

In addition, the chemical liquid spraying device according to the present invention; A chemical tank fixed to the cart; Pumping means connected to the chemical tank through a pipe and fixed to the cart; It is connected through the pumping means and the pipe, and comprises a nozzle fixed to the cart.

Hereinafter, with reference to the accompanying drawings to be described in detail the balance maintaining apparatus and the chemical liquid spraying apparatus using the same. Like reference numerals in the drawings denote members having the same function.

In the description of the balance maintaining device and the chemical liquid spraying device according to the present invention with respect to the direction, as shown in Fig. 2 is provided with a connecting means 10 for connecting to the wagon in the balance maintaining device (A) The upper side, the wheel (Wa) (Wb) side is called the lower side, the side on which the variable means 34 of the wheel gap adjusting means 30 is arranged rear, the opposite direction is called the front, perpendicular to the rotation axis (S1) Set the axial direction to the left and right.

First, the balance keeping device will be described. As shown in FIG. 2, the balance keeping device A according to the present invention includes connecting means 10 and wheels Wa and Wb, which are largely installed in the frame of the cart 50. And means 30 for limiting the rotation angle of the supports 20a and 20b connected to the wheel and the connecting means, and the supports 20a and 20b rotated on the rotation shaft S1 provided in the connecting means 10. )

The connecting means may be in various forms such as plates, and in some cases, the frame itself may be designed to be used as a connecting means.

However, in the present invention, for the sake of convenience, the shapes shown in FIGS. 2 and 3A will be described by taking the connecting means 10 having a rectangular shape by welding the angled rods as an example.

The connecting means 10 is coupled to the lower portion of the frame of the cart 50 using welding or bolts and nuts. In the center of the connecting means 10 is provided with a rotating shaft (S1), in the drawing, the rotating shaft (S1) is inserted into the coupling hole 13 formed in the connecting ring 11 and welded.

Supports 20a and 20b for connecting the connecting means 10 and the wheels Wa and Wb are rotatably connected to the pivot shaft S1. In the drawings, the wheel and the support are shown as a pair, respectively, even if the wheel and the support are each one, the balance maintaining device according to the present invention can exhibit the function, the number of wheels and the support and the wheel and the support The present invention is not limited by the form of connection.

In FIGS. 2 and 3a, the support bases 20a and 20b have connecting rings 21a and 21b formed with insertion holes 23a and 23b into which the pivot shaft S1 is inserted at the upper end thereof. Is connected to the support by connecting means. The connecting means is in the form of pieces 22a, 22b.

In particular, the ring 21a in the connecting piece 22a is connected to the connecting pieces 22a and 22b so that the tracks of the supports 20a and 20b moving while being engaged with each other left and right form an imaginary coplanar surface. It is biased, and the ring 21b is biased rearward at the connecting piece 22b.

Since this structure is for the wheel spacing means 30 to be described below, it is not an essential configuration for the balance maintaining device. Therefore, even when there are two wheels, the two wheels are fixed to one connecting plate, and the connecting plate may be rotatably coupled to the pivot shaft S1 of the connecting means 10 of FIG. 2.

The support members 20a and 20b are connected to the shafts of the wheels Wa and Wb, and the lower members 20a2 and 20b2 connected to the wheel connecting portions 24a and 24b, which are bent left and right, and the lower members. It consists of the upper member (20a1) (20b1) coupled to the left side and the right side, respectively. In this way, the support 20a (20b) is made of two members by dropping the upper member 20a1 (20b1) to a certain distance from each other, the variable shaft (S2) of the connecting table 31 forming the wheel spacing control means 30 is The spacing protrusion 34b of the variable means 34 to be inserted is to be positioned between the two upper members 20a1 and 20b1. Therefore, the shape of the supports 20a and 20b can be used in any form that ensures a space in which the spacing protrusion 34b can be inserted between the two supports.

2 and 3a, the balance maintaining device according to the present invention is connected to the cart 50 through the connecting means 10. When the ground is uneven while the cart is running, the balance maintaining device A maintains the balance of the bearing part of the cart by pivoting the supports 20a and 20b from side to side with the pivot shaft S1 as the axis. Is not perpendicular to the ground and is tilted left and right.

Even when the support is inclined, the bearing part of the cart 50 is leveled with respect to the ground due to the balance maintaining device. At this time, it is necessary to maintain the stability of the cart 50 by preventing the support from being excessively rotated.

To this end, the balance maintaining device of the present invention requires a means for limiting the angle of rotation of the supports 20a, 20b.

The illustrated rotation angle limiting means has one end connected to the support unit 20a and 20b below the connecting means 10 with the cart 50, and the other end is left and right of the support when the support unit is rotated. The rotation angle contacting the right side surface is in the form of limiting rods 15a and 15b. Length adjusting bolts 17a and 17b are screwed to the other end of the limiting rods 15a and 15b to retract the adjusting bolts 17a and 17b so as to adjust the rotation angle of the appropriate supports 20a and 20b. It is possible to secure the adjusted bolts 17a and 17b by tightening the fixing nuts 19a and 19b. In addition, if a spring-like shock absorbing means 17A, 17B is provided between the ends of the limiting rods 15a, 15b and the supports 20a, 20b, the balance maintaining device suddenly passes through the curved road surface. The shaking phenomenon can be prevented.

Alternatively, the rotation angle limiting means may be a shock absorber of a pneumatic, hydraulic or spring type connecting the connecting means 10 and the supports 20a and 20b.

As shown, a balance maintaining device A having two supports 20a, 20b and wheels Wa and Wb is provided with wheels Wa and Wb that are swung apart from side to side. ) A gap adjusting means 30 is provided.

As a component of the wheel spacing control means 30, first, the upper end is rotatably coupled to the rotation shaft (S1) provided in the connecting means (10) and the variable shaft (S2) is fixed to the lower portion ( 31). The upper end of the connecting table 31 is provided with a connecting ring 32 in which an insertion hole 33 into which the pivot shaft S1 is fitted is formed.

Next, the variable means 34 is formed with a central hole 34a into which the variable shaft S2 of the connecting table 31 is fitted. The front surface of the variable means 34 is formed with a gap maintaining protrusion 34b having a hole concentric with the center hole 34a. After the variable means 34 are inserted into the variable shaft S2, the fixing ring 39a may be inserted into the variable shaft S2, and then the swing of the variable means 34 may be prevented by using the fixing bolt 39b. .

The variable means 34 includes guide holes 35a and 35b into which the support protrusions 20a and 20b are inserted, particularly the adjustment protrusions 25a and 25b positioned behind the upper members 20a1 and 20b1. Is formed. The guide holes 35a and 35b are formed to be curved outwardly from the center portion.

In the vicinity of the edge of the variable means 34 is formed a plate-shaped lever 38 protruding substantially symmetrically to the rear. As shown in FIGS. 3A and 3B, when the lever 38 is rotated to rotate the variable means 34, the protrusions 25a and 25b of the supports 20a and 20b are guide holes 35a and 35b. ) And the wheels (Wa) (Wb) connected to the support according to the occlusal motion.

Thus, as shown in FIGS. 2 and 4 to assist the interlocking operation of the wheels Wa and Wb by the wheel gap adjusting means 30, elastic means are provided between the two supports 20a and 20b. .

In particular, the illustrated elastic means is intended to assist the engagement operation of the wheel (Wa) (Wb), the through hole formed in the support (20a, 20b), in particular the left upper member (20a1) of the upper member (20a1, 20b1) ( One end is inserted and fixed (e.g., welded) to 26a), and the guide rod 41 has the other end inserted into the through hole 26b formed in the right upper member 20b1.

Coil spring 40 is fitted to the guide rod 41, so that the wheel Wa (Wb) is reduced due to the repulsive force of the spring 40 even if a small force is applied to the lever 38 of the wheel interval adjusting means 30. The movements that take place with each other are made easy.

The guide rod 41 is bent in accordance with the movement trajectory of the supports 20a and 20b to be engaged with the rotation shaft S1 as the axis.

When the wheel spacing adjusting means as described above is provided, the balance of the wheels Wa and Wb is fixed as shown in FIG. 3a and the wheels Wa and Wb are opened as shown in FIG. 3b. Stability in driving and stopping of the cart using the device can be achieved. In the present invention, a means for fixing the bite state of the wheel Wa (Wb) is introduced into the guide holes (35a) 35b of the variable means (34).

That is, as shown in the front view inside the circle C1 of Figure 2, the guide hole (35a, 35b) of the variable means 34 of the wheel spacing adjusting means 30 in the recesses (36a, 36b) (37a, 37b) Is formed.

Due to this, as shown in Figure 3a, the adjusting projections (25a, 25b) of the support (20a, 20b) is located in the outer direction by the elastic force of the spring 40 when located on both inner ends of the guide hole (35a) (35b) The concave indentations 36a and 36b (see circle C1 in Fig. 2) are formed. 3B, the adjustment protrusions 25a and 25b enter the concave portions 37a and 37b (refer to circle C1 in Fig. 2) when they are located at the outer ends of the guide holes 35a and 35b.

Thus, the adjustment projections 25a (25b) located in each recess 36a, 36b (37a, 37b) is not easily released by the elastic force of the spring 40, thereby the wheel (Wa) (Wb) The engagement state can be fixed.

The shape of the recessed portion of the guide holes 35a and 35b shown is that the elasticity of the spring 40 acts on the operation of opening the wheels Wa and Wb as shown in FIG. 3B. However, if the elasticity of the spring acts to retract the wheel (Wa) (Wb), the recessed portion of the guide hole must be indented inward to function.

In addition, although the recess is formed on both ends of the guide hole, if necessary, it is possible to adjust the bite gap between the wheel (Wa) (Wb) by forming a recess in the middle or other positions of the guide hole.

The balance maintaining device according to the present invention described above can be used in all conventionally known carts, including wheels, two wheels, three wheels, four wheels. In this case, the balance maintaining device according to the present invention can be used in the form of replacing all or part of the wheels of the conventional various carts. In addition, the wheel of the balance maintaining device according to the present invention may be one or a pair as shown in Figure 2 or less.

For example, when the wheel and the support provided in the balance maintaining device of the present invention is one by one and the wheelbarrow is a wheelbarrow 200 shown in FIG. 1, the control device of the present invention can be used instead of the wheel 210 of the wheelbarrow. have. Of course, a balance retainer with a pair of wheels and supports as shown in FIG. 2 can also be used in place of the wheel 210 of the cart.

In addition, a balance maintaining device according to the present invention may be provided in place of the stop 220 in a position where the stop 220 is arranged in the conventional wheelbarrow 200 shown in FIG. 1. In this case, the wheel of the balance maintaining device is used as an auxiliary wheel of the outer wheel 210.

If the balance maintaining device A having two wheels Wa and Wb is used in place of the stop 220 as shown below in Fig. 2, the wheelbarrow becomes substantially three wheelbarrow, Due to the 30, the wagon is convenient to move the narrow passage, and the stop state of the wagon is stable when the wheel Wa (Wb) intervals are opened as shown in FIG. 3B.

In applying the balance maintaining device according to the present invention to a wheelbarrow, in particular, a chemical spraying device using a wheelbarrow, as shown in FIG. 6 or less, the balance maintaining device having two wheels functions as an auxiliary wheel of a conventional wheelbarrow. It is preferable for the convenience of narrow passageway driving and the stability of the stopped state.

Next, FIG. 6 shows a float-type chemical liquid spraying device B equipped with the balance maintaining apparatus of the present invention described above. The cart 50 of FIG. 6 is a form in which a balance maintaining device A is provided at a portion of the stop 220 of the conventional wheelbarrow 200 shown in FIG. 1.

In Figure 6, the chemical liquid spraying device (B) according to the present invention is largely equipped with a wheel (W) wheel (50), the chemical tank (63) and the pumping means (60) installed in the cart (50), It consists of a nozzle 65 for spraying the chemical liquid discharged by the pumping means, and a balance maintaining device attached to the rear lower portion of the cart.

In connection with the cart 50 shown in FIG. 6, reference numeral 51 denotes the main wheel (W) fixing frame, 52 denotes a handle, 53 denotes a pumping means 60 mount, 54 denotes a chemical tank 63 mount, and 55 and 56 denotes the vertical mounting portions of the nozzle posts 64a and 64b or the mounting bases 71a and 71b for the nozzle posts.

6 and 7, the pumping means 60 is composed of a pump 61 and a pump operating means 62. The pumping means 60 is arranged in the mounting portion 53 of the cart 50, pumping the chemical liquid supplied from the chemical tank 63 is also arranged in the mounting portion 54 of the cart 50 and sprayed to the nozzle. The pump operating means 62 may be an internal combustion engine, a battery, or the like.

In FIG. 7, P1 is a chemical liquid supply pipe among the pipes connecting the pump 61 and the tank 63, and P2 returns the remaining filtrate pumped from the pump 61 to the tank 63 and maintains the pressure in the tank 63. U-turn tube.

6 and 7 the chemical liquid discharged from the pump 61 is supplied to the branch pipe (P4) through the pipe P3, the chemical liquid is six connection pipes (P5a, P5b, P5c) connected to the branch pipe (P4) It is injected through six nozzles 65a, 65b, 65c (65d, 65e, 65f) via (P5d, P5e, P5f). The number of nozzles and connecting pipes can be adjusted as needed.

The six nozzles 65a, 65b, 65c (65d, 65e, 65f) are arranged in two nozzle units 65a, 65b which are arranged in pairs and fixed by three, and the nozzle units are nozzle unit mounting means 70. It is fixed to the cart 50 through).

The nozzle unit mounting means 70 is an auxiliary mount (71a) (71b) arranged in the vertical fixing portion 55, 56 of the cart 50, and a connecting rod connected to one end rotatably with the auxiliary mount ( 72) and 73, and a fixing rod 74 which is rotatably connected to the other end and one end of the connecting rod. The rear end of the fixing member 74 is fixed to the handle 61a of the pump 61 of the pumping means 60 by the fixing means F.

The operation and effects of the balance maintaining device according to the present invention described above and the chemical spraying device using the balance maintaining device will be described in detail as a main example as shown in FIG. 6 when the balance maintaining device is used as an auxiliary wheel of a conventional wheelbarrow. .

In the chemical liquid spraying device (B) according to the present invention, the balance maintaining device (A) provided in the cart (50) at the time of stopping is used as the auxiliary wheel (Wa) by using the wheel gap adjusting means (30) as shown in FIG. (Wb) It is advantageous to pass the narrow passage by narrowing the distance between the wheels (Wa) by turning the variable means 34 to the right by pressing the lever (38) while running in the spaced apart state.

In FIG. 6, when spraying the chemical liquid in the greenhouse, it is common to move the cart 50 forward while holding and pushing the handle 52, but according to the user, the handle 52 may be held by the handle 52 in order to drain the chemical liquid. Another method is to drag 50) to move backwards. 6 and 7, when the chemical liquid is sprayed, the pump 61 operating means 62 is operated so that the chemical liquid supplied from the tank 63 is sprayed from the nozzles 65a, 65b, 65c and 65d, 65e, 65f. do. At this time, if a valve is provided on the connecting pipe, all of them should be opened.

When the chemical liquid spreading device (B) moves while the ground passes through an uneven place, the pumping means (60) loaded on the wagon 50 and the wagon may not swing due to the balance maintaining device (A). 64a) 64b may also be balanced.

As shown in FIG. 5A, when the right side of the cart 50 is lowered and is inclined, the balance maintaining device A may be rotated by the wheels Wa and the supports 20a and 20b. It is tilted from the state of ① to ② of the center. The angle of the support 20a, 20b is inclined in the ② state is the end of the limiting bar 15a while the shock absorbing means 17A (constructing the length adjustment bolt 17a is omitted in Figure 2) provided at the end of the rotation angle limiting bar 15a Is limited by being close to the side of the support 20a.

In addition, as shown in FIG. 5B, when the left side of the cart 50 is lowered and is inclined, the wheels Wa and the support bases 20a and 20b are in the state of ① around the pivot shaft S1. Tilt to the state of. In addition, the angle of the support 20a, 20b is inclined in the ③ state is the buffering means 17B (constructing the length adjustment bolt 17b is omitted in Figure 2) provided at the end of the rotation angle limiting rod 15b of the limiting rod 15b The end is limited by being close to the side of the support 20b.

Due to the operation of the balance maintaining device (A) as described above, the chemical spray device (B) is capable of running with a sense of stability even when the path is as steep as the wheelbarrow 50 does not tilt left and right.

When the vehicle is stopped, the vehicle may be stopped by spreading the wheels Wa and Wb by using the wheel spacing adjusting means 30 in the state of FIG. 3a.

As described above, the balance maintaining device according to the present invention includes wheels (Wa) and (Wb) supports 20a and 20b which are arranged to be rotated about the rotation shaft S1 of the connecting means 10 connected to the cart. It is possible to run in a state in which the cart remains balanced without oscillating from side to side as much as possible, and the wheel gap adjusting means 30 can provide stability at stopping and driving.

When the balance maintaining device of the present invention is introduced into a chemical spraying apparatus using a float, the spraying of the chemical spraying can be performed without significantly changing the angle of the nozzle units 64a and 64b provided with the nozzles while the nozzle is inclined during the spraying operation. It is possible to solve the problem that the nozzles and crops collide, or the chemical spray is concentrated on a part of the crop group.

Various features of the balance adjusting device of the present invention described above with reference to the accompanying drawings and the chemical liquid spraying apparatus using the same may be variously modified and combined by those skilled in the art, but such modifications and combinations are within the protection scope of the present invention. Should be interpreted as belonging.

1 is a perspective view showing a skeleton of a conventional wheelbarrow,

2 is an exploded perspective view of a balance maintaining device according to the present invention;

Figure 3a and Figure 3b is a perspective view of the operation state of the wheel spacing means provided in the balance maintaining apparatus according to the present invention from the rear,

4 is a perspective view of the balance maintaining device from the front,

5a and 5b is a front view as seen from the front of the operating state of the balance maintaining device,

6 is a perspective view of a chemical liquid spraying device having a balance maintaining device according to the present invention;

Figure 7 is a schematic plan view showing the piping relationship between the tank, the pumping means and the nozzle in the chemical liquid spreading apparatus according to the present invention.

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

S1: rotating shaft S2: variable shaft

Wa, Wb, W: Wheels

10: connecting means 11: connecting ring

13: coupling hole 15a, 15b: rotation angle limited bar

17a, 17b: Length adjusting bolt 19a, 19b: Fixing nut

20a, 20b: support 21a, 21b: connecting ring

22a, 22b: connecting piece 23a, 23b: insertion hole

24a, 24b: Wheel connection 25a, 25b: support gap adjustment protrusion

26a, 26b: through hole

30: wheel spacing adjusting means 31: connecting rod

32: Link 33: Insertion hole

34: variable means 34a: center hole

34b: spacing protrusion 35a, 35b: guide hole

36a, 36b, 37a, 37b: recessed part 38: lever

40: spring 41: guide rod

50: wheelbarrow 51: main wheel fixing part

52: handle 53: pumping means mounting

54: tank mounting portion 55, 56: vertical fixing portion

60: pumping means 61: pump

62: pump operating means 61a: handle

63: chemical tank 63a: lid

64a, 64b: nozzle stand

65a, 65b, 65c, 65d, 65e, 65f: nozzle

66: fixing means 67: clip

68: nozzle slot insert 69: lever

70: nozzle unit connecting rotation means 71a, 71b: auxiliary mounting table

72,73: connecting rod 74: holding base

P1, P2, P3, P4 (Branch), P5a, P5b, P5c, P5d, P5e, P5f: Connection piping

Claims (11)

A connecting means installed on the frame of the cart and having a rotating shaft; An upper end rotatably coupled to a rotation shaft of the connecting means, and a lower end of which is provided with a wheel; And Balanced device for a wheelbarrow comprising a rotation angle limiting means of the support moving around the pivot axis of the connecting means. The method of claim 1, Balanced device for a wheelbarrow, characterized in that the wheel and the support consists of a pair. The method of claim 2, Balance maintenance device for a wheelbarrow, characterized in that it further comprises a wheel spacing means for adjusting the spacing of the pair of wheels. According to claim 3, wherein the wheel spacing means A pair of supports freely coupled to the rotation shaft; An upper end portion rotatably coupled to the pivot shaft, and a connecting rod having a variable shaft fixed to the lower portion thereof; A variable means having a center hole into which the variable shaft of the connecting rod is fitted and a guide hole extending from the center to the outside; A control projection coupled to the support to be inserted into the guide hole of the variable means; And Balance maintenance device for a wheelbarrow, characterized in that it comprises a lever for the rotation of the variable means. According to claim 4, wherein the wheel spacing means Balanced device for a cart, characterized in that it further comprises an elastic means arranged between the pair of supports. The method of claim 5, wherein Wherein the elastic means is a coil spring, the balance retainer for a float, characterized in that the guide rod is inserted into the through hole formed at one end of the support and the other end is formed in the other support in the center of the spring. The method of claim 5, wherein Two guide holes of the variable means are formed in the recess corresponding to each other, the cart is characterized in that the adjustment projection of the support carried by the elastic means is inserted into the recess so that the position is not easily separated Balancer for The method according to any one of claims 1 to 7, The rotation angle limiting means is a balance maintaining device for a wheelbarrow, characterized in that the rotational angle limiting bar is formed between the connecting means and the support. The method of claim 8, The rotation angle limiting bar is a balance maintaining device for a wheelbarrow, characterized in that it is provided with a length adjusting bolt. The method of claim 8, And a cushioning means provided between the end of the rotational angle limiting rod and the support. The method according to any one of claims 1 to 7, The rotation angle limiting means is a balance maintaining device for a wheelbarrow, characterized in that the shock absorber connecting between the connecting means and the support.