JP6853224B2 - Transport trolley - Google Patents

Description

The present invention relates to a transport trolley for loading and transporting materials and the like.

Conventionally, the transport trolley described in Patent Document 1 is known as a trolley for loading and transporting various materials and the like at a construction site or the like. This transport trolley is provided near four corners on the back surface of the loading platform, and is provided at a universal wheel whose traveling direction can be freely changed and at a substantially central portion of the universal wheel, and the traveling direction of the wheel is fixed. It has fixed wheels.

When the direction of the transport trolley is changed, the loading platform rotates with the fixed wheels as the fulcrum, and the rotation operability is good. Also, when traveling straight on a slope, the fixed wheels try to go straight, which improves straight-line stability. It was excellent.

Japanese Unexamined Patent Publication No. 2001-80517

In the dolly described in Patent Document 1, a frictional force is generated between the fixed wheels and the traveling surface when the dolly is turned around the fixed wheels, and friction is particularly needed to turn the dolly when transporting a heavy object. It was necessary to apply a turning force that resisted the force. Further, when the bogie turns, the friction between the fixed wheel and the floor surface may leave a tire mark of the fixed wheel on the traveling surface.

Therefore, an object of the present invention is to provide a transport trolley capable of raising and lowering fixed wheels in order to solve the above-mentioned problems.

The transport trolley according to the present invention includes a trolley main body, a plurality of free wheels attached to the lower part of the trolley main body, a fixed wheel device attached to the lower part of the trolley main body, and an elevating / lowering device for raising and lowering the fixed wheel device. The fixed wheel device includes means, a base attached to the lower part of the bogie body, an arm portion swingably attached to the base, and fixed wheels attached to the arm portion. It is provided with an urging means connected between the base and the arm portion to urge the fixed wheels downward, and the elevating means includes a plurality of guide members arranged in the lower part of the trolley body. One end is attached to the arm portion side, the other end is attached to the base side, and the intermediate portion is moved by the wire rod guided by the guide member and at least one of the guide members to move the guide member. interval to adjust the tension of the wire by varying the, and further comprising a moving means for lifting the front Symbol fixed vehicle wheels through the wire.

Further, the transport carriage according to the present invention is characterized in that the wire rod is in a relaxed state when the universal wheel and the fixed wheel are in contact with the traveling surface at the same time.

Further, the transport trolley according to the present invention is characterized in that the urging means is arranged so that the direction of the elastic restoring force is parallel to the traveling surface.

According to the transport trolley of the present invention, it is possible to provide a transport trolley in which fixed wheels can be raised and lowered.

Further, according to the transport trolley of the present invention, since the fixed wheels are lowered by the weight of the fixed wheel device due to the loose wire, the urging force of the urging means can be small, and therefore the urging force applied to the fixed wheels. This prevents the transport trolley from floating, and can stably transport the materials and the like stacked on the transport trolley.

Further, according to the transport trolley of the present invention, by making the elastic restoring force of the urging means different from the urging force of the wheels, it is possible to prevent the transport trolley from being lifted by the excessive urging force applied to the wheels. , It is possible to stabilize the transportation and stacking of transportation trolleys.

It is a left rear side perspective view of the transport trolley which shows Example 1 of this invention. It is the right rear side perspective view of the transport trolley. It is the cross-sectional view of the transport trolley which shows the descending state of a fixed wheel. FIG. 3 is a cross-sectional view of a transport trolley showing a state in which the fixed wheels are further lowered from the state of FIG. It is the cross-sectional view of the transport trolley which shows the ascending state of a fixed wheel. It is the bottom side perspective view of the bogie body which omitted the fixed wheel device. The same is a perspective view of the fixed wheel device.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the content of the present invention described in the claims. Moreover, not all of the configurations described below are essential requirements of the present invention.

In FIGS. 1 to 7, reference numeral 1 denotes a transport carriage, which includes a carriage main body 2, a universal wheel 3, a fixed wheel device 4, and an operation handle 5.

The bogie body 2 has a front side rod 11, a rear side rod 12, a left side rod 13, and a right side rod 14, and is formed in a frame shape having a substantially rectangular shape in a plan view. The front side rod 11, the rear side rod 12, the left side rod 13, and the right side rod 14 are formed in a square tubular shape. The front side rod 11 and the rear side rod 12 are formed to have the same length, and the left side rod 13 and the right side rod 14 are formed to have the same length. The left side rod 13 and the right side rod 14 are formed longer than the front side rod 11 and the rear side rod 12.

The front rod 11 is connected to the left front insertion portion 15 and the right front insertion portion 16, and the rear rod 12 is connected to the left rear insertion portion 17 and the right rear insertion portion 18. The left rod 13 is connected to the left front insertion portion 15 and the left rear insertion portion 17, and the right rod 14 is connected to the right front insertion portion 16 and the right rear insertion portion 18.

The left front insertion part 15, the right front insertion part 16, the left rear insertion part 17, and the right rear insertion part 18 are formed in a substantially square tubular shape, the upper side is completely opened, and the lower side is partially closed by the bottom part (not shown). ing. A push rod (not shown) or a metal pipe (round pipe or square pipe) (not shown) is inserted into the left front insertion portion 15, the right front insertion portion 16, the left rear insertion portion 17, and the right rear insertion portion 18. However, it is also possible to move or stop the transport trolley 1 by grasping the push rod or the like and applying a force. The bottom of the push rod and the like is prevented from falling downward from the left front insertion portion 15, the right front insertion portion 16, the left rear insertion portion 17, and the right rear insertion portion 18.

On the front side and the left side of the outer surface 19 of the left front insertion portion 15, cushioning members 20 for cushioning the impact when the transport carriage 1 collides with another object are provided. Further, cushioning members 22 are also provided on the front side and the right side of the outer surface 21 of the right front insertion portion 16. Further, buffer members 25 and 26 are also provided on the left outer surface 23 of the left rear insertion portion 17 and the right outer surface 24 of the right rear insertion portion 18.

A mounting base portion 27 having a rectangular shape in a plan view is fixed to the left side rod 13 and the right side rod 14. The upper surface 28 of the mounting base 27 is formed flat, and is substantially flush with the upper surface 29 of the left side rod 13 and the upper surface 30 of the right side rod 14. Materials and the like are loaded on the mounting base 27. A gap 31 is formed between the front side rod 11 and the mounting base portion 27, and a gap 32 is similarly formed between the rear side rod 12 and the mounting base portion 27.

The left front mounting plate portion 33 and the right front mounting plate portion 34 to which the wheels 3 are attached are fixed to the lower surface of the front rod 11 and the lower surface of the mounting base portion 27. The left front mounting plate portion 33 and the right front mounting plate portion 34 are formed in a substantially rectangular plate shape. The left front wheel 3 is fixed to the lower surface of the left front mounting plate portion 33, and the right front wheel 3 is fixed to the lower surface of the right front mounting plate portion 34.

The left rear mounting plate portion 35 and the right rear mounting plate portion 36 to which the wheels 3 are attached are fixed to the lower surface of the rear side rod 12 and the lower surface of the mounting base portion 27. The left rear mounting plate portion 35 and the right rear mounting plate portion 36 are formed in a substantially rectangular plate shape. The left rear wheel 3 is fixed to the lower surface of the left rear mounting plate portion 35, and the right rear wheel 3 is fixed to the lower surface of the right rear mounting plate portion 36.

The free wheel 3 is rotatable and swivelable, and all four free wheels 3 have the same shape.

A plurality of transport trolleys 1 of this embodiment can be stacked, and the wheels 3 of the upper transport trolley 1 are arranged in the gaps 31 and 32, and the left front mounting plate portion 33 and the right front mounting plate portion 33. 34, it is mounted on the left rear mounting plate portion 35 and the right rear mounting plate portion 36. Since the gaps 31 and 32 are surrounded by the front side rod 11, the rear side rod 12, the left side rod 13, the right side rod 14, and the mounting base portion 27, the wheels 3 of the upper transport trolley 1 are the lower transport trolleys. It is designed not to drop out from 1.

As shown in FIGS. 3 to 5 and 7, the fixed wheel device 4 is arranged at the center of the lower surface of the mounting base 27 so as to be the center position of the four free wheels 3. The fixed wheel device 4 is capable of traveling only in the front-rear direction of the transport carriage 1.

The fixed wheel device 4 includes a base 37 provided in the central portion of the lower surface of the mounting base 27, an arm 38 rotatably supported by the base 37, and a pair provided at the tip of the arm 38. It is equipped with fixed wheels 39.

The base 37 is attached to a base frame 40 provided on the lower surface of the mounting base portion 27. As shown in FIG. 6, the foundation frame 40 has a front frame 41 made of L-shaped steel parallel to the left-right direction of the trolley 1 at the center of the lower surface of the mounting pedestal portion 27, and a trolley at the rear end portion of the lower surface of the mounting pedestal portion 27. A rear frame 42 made of L-shaped steel parallel to the left-right direction of 1 and a left frame 43 and a right frame 44 made of L-shaped steel provided between the front frame 41 and the rear frame 42 parallel to the front-rear direction of the trolley 1, respectively. The left side frame 43 and the right side frame 44 are provided with a space in the left-right direction, and mounting holes 45 and 46 are bored in the lower surface portions of the left side frame 43 and the right side frame 44, respectively. The base 37 can be attached to the left side frame 43 and the right side frame 44 by fixing means (not shown) such as bolts and nuts.

The base 37 has a side piece 47A, 47B made of a pair of left and right metal plates, an upper connecting rod 48 connecting the upper parts of the side pieces 47A, 47B, and a lower connecting rod 48 connecting the lower parts of the side pieces 47. It has 49 and. The side pieces 47A and 47B include mounting portions 50A and 50B whose upper portions are horizontally bent, and rear end portions 51A and 51B whose lower portions extend rearward. The mounting portions 50A and 50B of the base 37 are mounted on the left side frame 43 and the right side frame 44 via fixing means (not shown) such as bolts and nuts. The lower connecting rod 49 connects the rear end portions 51A and 51B to each other.

The arm portion 38 is formed of a single metal plate material including an upper surface portion 52 and a left side surface portion 53 and a right side surface portion 54 having both left and right ends of the upper surface portion 52 extending downward, respectively, and the left side surface portion 53. And the base ends 53A and 54A of the right side surface portion 54 are rotatably supported by the shaft portions 55A and 55B on the side surface pieces 47A and 47B of the base 37, respectively, and the tip end 53B and the right side surface portion 54 of the left side surface portion 53. The tip 54B of the fixed wheel 39 is connected by the axle 56 of the fixed wheel 39.

Further, the base 37 and the arm portion 38 have an arm portion side pin 57 that connects the middle of the left side surface portion 53 and the right side surface portion 54 of the arm portion 38, and a tension coil spring 58 that is an urging means for the lower connecting rod 49. Both ends of the are connected.

Here, under the shaft portions 55A and 55B of the side surface pieces 47A and 47B, a male screw member screwed into either or both of the side surface pieces 47A and 47B (in this embodiment, the left side surface piece 47A). The rotation control unit 59 is provided.

When the arm portion 38 rotates backward (counterclockwise in FIGS. 3 to 5) about the shaft portions 55A and 55B, the arm portion 38 comes into contact with the rotation restricting portion 59 to restrict the rearward rotation and upward. When it rotates (clockwise in FIGS. 3 to 5), it comes into contact with the upper connecting rod 48 and its upward rotation is restricted.

With the above configuration, the arm portion 38 is rotatably restricted between the rotation restricting portion 59 and the upper connecting rod 48, and the tips 53B and 54B of the arm portion 38 are rotated in front of the shaft portions 55A and 55B. In addition to the configuration, the intermediate portion of the arm portion 38 and the lower portion of the side pieces 47A and 47B below the shaft portions 55A and 55B are elastically connected by the tension coil spring 58, so that the tension coil spring 58 is substantially rearward in the horizontal direction. When the tips 53B, 54B of the arm portion 38 rotate downward with the shaft portions 55A, 55B as the center of rotation due to the elastic restoring force of the arm portion 38, the fixed wheels 39 provided on the tips 53B, 54B side of the arm portion 38 are the shaft portions 55A, 55B. When the wheel rotates downward along the rotation locus X centered on the above and touches the traveling surfaces F and S, the above-mentioned elastic restoring force of the tension coil spring 58 is applied downward to the fixed wheel 39 via the arm portion 38. Granted as a force. Here, the direction of the urging force is expressed as downward, but since the direction of the urging force is almost equal to the tangential direction of the rotation locus X when the fixed wheel 39 touches the ground, the rotation locus X of the fixed wheel 39 descends. It changes from substantially vertical downward to diagonally backward and downward corresponding to the tangential direction.

The upper surface portion 52 of the arm portion 38 is provided with the first chain bolt 60, and the second chain bolt 62 is provided on the upper portion of the mounting plate 61 provided on the rear surface portion of the upper connecting rod 48. A first sprocket 63 is attached to the front of the front frame 41. A second sprocket 64 is attached to the front of the rear frame 42 via a toggle clamp 65 as a means of transportation. The toggle clamp 65 is attached to the rear frame 42 in a state of being inserted into a mounting hole 66 formed in the rear frame 42.

The toggle clamp 65 is provided with a shaft 68 that can move forward and backward toward the inside of the base frame 40 via a predetermined toggle mechanism (link mechanism) (not shown) based on the rotation operation of the handle portion 67. As shown in FIG. 3, when the handle portion 67 is rotated upward to be in a substantially horizontal state, the shaft 68 advances to the front side, and as shown in FIG. 5, the handle portion 67 is rotated downward. When the shaft 68 is turned downward, the shaft 68 retracts to the rear side. Since the detailed description of the toggle clamp 65 is a known technique, the description thereof will be omitted here. A second sprocket 64 is attached to the tip of the shaft 68.

The roller chain 69 (hereinafter referred to as a chain 69) as a wire rod is hung on the first chain bolt 60, the first sprocket 63, the second sprocket 64, and the second chain bolt 62. The chain 69 is laid between the first sprocket 63 and the second sprocket 64 by being wound around the outer periphery of the first sprocket 63 and the second sprocket 64 and engaged with the chain 69, and is guided in the base frame 40. An opening 70 for guiding the chain 69 into the base frame 40 is formed in the central portion of the front frame 41.

As shown in FIG. 3, when the second sprocket 64 is moved forward, the distance between the first sprocket 63 and the second sprocket 64 is narrowed to the interval L1 and the chain 69 is relaxed, the fixed wheel 39 descends due to its own weight. In addition, as shown in FIG. 5, the second sprocket 64 is moved backward, the distance between the first sprocket 63 and the second sprocket 64 is widened to the interval L2, and the chain 69 is pulled backward while being in a tense state. And the fixed wheel 39 is in an ascending state. The relationship between the interval L1 and the interval L2 is L1 <L2.

The chain 69, the first sprocket 63, the second sprocket 64, and the toggle clamp 65 constitute an elevating means 71 for raising and lowering the fixed wheel 39 of the fixed wheel device 4.

Further, as shown in FIG. 3, when the universal wheel 3 and the fixed wheel device 4 are in contact with the flat traveling surface F (horizontal traveling surface in the drawing) at the same time, the tension coil spring 58 is substantially on the traveling surface F. It is in a state parallel to (in the figure, a substantially horizontal state), and the chain 69 is in a relaxed state.

A cylindrical extension handle body 72 having a total length longer than that of the handle portion 67 is fitted onto the handle portion 67, and the extension handle body 72 is bent downward at an intermediate portion. Further, a cover body 73 that protects the toggle clamp 65 from above is provided above the central portion of the gap 32.

The operation handle 5 is composed of a left handle 5A provided at the left rear end of the carriage body 2 and a right handle 5B provided at the right rear end of the carriage body 2. The left-hand drive 5A and the right-hand drive 5B are paired left and right.

Explaining the relative vertical movement amount of the fixed wheel 39 with respect to the free wheel 3, in this embodiment, as shown in FIG. 4, the front free wheel 3 and the rear free wheel 39 in the lowered state of the fixed wheel 39 are described. The vertical downward movement amount M1 of the fixed wheel 39 with respect to the virtual line (single point chain line Y in the drawing) connecting with 3 is set to 50 mm, and the upward movement amount M2 of the fixed wheel 39 in the raised state of the fixed wheel 39 shown in FIG. However, regarding the amount of movement M2, if the fixed wheels 39 are separated from the traveling surfaces F and S even a little, the transport trolley 1 can travel only with the free wheels 3, and the amount of movement M1 is higher than that of the amount M1. It can be set small. The movement amount M1 and the movement amount M2 can be changed as appropriate.

As shown in FIG. 6, the first front side guide pin 74 and the first rear side guide pin 75 are provided inside the left side rod 13 with a distance in the front-rear direction, and inside the right side rod 14 The second front guide pin 76 and the second rear guide pin 77 are provided with a distance in the front-rear direction. Then, as shown in FIGS. 3 to 5, the fixed wheel device 4 is arranged between the front guide pins 74 and 76 and the rear guide pins 75 and 77. Then, when inserting the claw portion of a lift device such as a forklift or a hand lift into the lower part of the transport trolley 1 in order to transport the transport trolley 1, to insert from the left side of the transport trolley 1, the left front side guide To insert the claws so that they pass outside the pin 74 and the left rear guide pin 75, and to insert from the right side of the transport trolley 1, the right front guide pin 76 and the right rear guide pin 77, respectively. By inserting the claw portion so as to pass through the outside, the claw portion of the lift device can be inserted without contacting the fixed wheel device 4. By providing the second chain bolt 62 above the lower surfaces of the left side rod 13 and the right side rod 14, it is possible to prevent the claw portion of the lift device from coming into contact with the chain 69.

The operation and effect of the transport trolley having the above configuration will be described. As shown in FIG. 3, the handle portion 67 is in a substantially horizontal state, the shaft 68 is advanced toward the first sprocket 63, the distance between the first sprocket 63 and the second sprocket 64 is narrowed, and the first sprocket 63 is used. When the chain 69 hung on the second sprocket 64 is left in a relaxed state, the fixed wheel 39 of the fixed wheel device 4 has the urging force of the tension coil spring 58, the fixed wheel 39, etc. via the arm portion 38. Since the fixed wheel device 4 is urged downward by its own weight, the fixed wheel device 4 can be constantly grounded on the traveling surfaces F and S. The arm portion 38 is provided so as to be inclined so as to lower the tips 53B and 54B.

Further, as shown in FIG. 4, even when the transport trolley 1 moves from the horizontal traveling surface F to the inclined traveling surface S, play occurs in the rotation operation of the arm portion 38 due to the slack of the chain 69. The fixed wheel device 4 is caused by the natural descent of the fixed wheel 39 due to the weight of the arm portion 38 and the fixed wheel 39, and the forced descent of the fixed wheel 39 due to the urging force of the tension coil spring 58. The vertical position of the fixed wheel 39 can be automatically adjusted according to the traveling surfaces F and S so that the fixed wheel device 4 can be grounded.

When the fixed wheel 39 of the fixed wheel device 4 is lowered, in addition to the downward urging force by the tension coil spring 58 via the arm portion 38, the arm portion 38 and the fixed wheel 39 naturally fall due to their own weight. The spring constant of the tension coil spring 58 can be set smaller than that of the descent of the fixed wheel 39 due only by the urging force of the tension coil spring 58.

Further, as shown in FIG. 5, when raising the fixed wheel device 4, when the operator steps forward on the extension handle body 72 from the operation handle 5 side, the handle portion 67 faces downward and the shaft 68 retracts. The chain 69 is pulled backward by the two sprockets 64 in a tense state, and the fixed wheels 39 are in an ascending state separated from the traveling surfaces F and S.

Here, in order to turn the handle portion 67 downward, it is necessary to step on the extension handle body 72 with a foot against the weight of the arm portion 38 and the fixed wheel 39 and the urging force of the tension coil spring 58, and the tension coil spring. By reducing the spring constant of 72 and further forming a hole 74 (see FIG. 7) in the arm portion 38 to reduce the weight, the extension handle body 72 can be easily operated. When the handle portion 67 is returned to the substantially horizontal state from the state shown in FIG. 5, the fixed wheels 39 are lowered and the transport trolley 1 can be returned to the lowered state shown in FIG.

As described above, in the transport sprocket 1 of the present embodiment, the sprocket body 2, the plurality of free wheels 3 attached to the lower part of the sprocket body 2, and the fixed wheel device 4 attached to the lower part of the sprocket body 2 The fixed wheel device 4 includes an elevating means 71 for raising and lowering the fixed wheel device 4, and the fixed wheel device 4 includes a base 37 attached to the lower part of the sprocket body 2 and an arm portion 38 swingably attached to the base 37. The elevating means 71 includes a fixed wheel 39 attached to the arm portion 38 and an urging means 58 connected between the base 37 and the arm portion 38 to urge the fixed wheel 39 downward. The first sprocket 63 and the second sprocket 64, which are a plurality of guide members arranged at the lower part of the trolley body 2, one end is attached to the arm portion 38 side, the other end is attached to the base 37 side, and the intermediate portion is attached. The distance between the first sprocket 63 and the second sprocket 64 can be changed by moving the chain 69, which is a wire rod guided by the first sprocket 63 and the second sprocket 64, and the second sprocket 64, which is at least one of the guide members. By providing a toggle clamp 65 which is a moving means for raising and lowering the fixed wheel 39 via the chain 69 by adjusting the tension of the chain 69, it is possible to provide a transport sprocket capable of raising and lowering the fixed wheel. it can.

Further, in the transport carriage 1 of the present embodiment, the chain 69 is in a relaxed state when the universal wheels 3 and the fixed wheels 39 are in contact with the traveling surfaces F and S at the same time, so that the chain 69 is loosened. Since the fixed wheels 39 are lowered by the weights of the arm portion 38 and the fixed wheels 39, the urging force of the tension coil spring 58 is small, so that the trolley 1 is lifted by the urging force applied to the fixed wheels 39. It is possible to prevent the materials and the like stacked on the transport trolley 1 from being stably transported.

Further, in the transport carriage 1 of the present embodiment, the tension coil spring 58 is arranged so that the direction of the elastic restoring force is parallel to the traveling surfaces F and S, so that the elastic restoring force of the tension coil spring 58 is increased. By setting the direction different from the urging force of the fixed wheels 39, it is possible to prevent the transport trolley 1 from floating due to the excessive urging force applied to the fixed wheels 39, and to stabilize the transportation and stacking of the transport trolley 1. ..

The present invention is not limited to the above examples, and various modifications can be made within the scope of the gist of the present invention. For example, the mechanism for moving the second sprocket is not limited to the toggle clamp. Further, in the lifting means, in addition to the combination of the chain and each sprocket, a combination of a wire rod such as a toothed belt or a wire and a pulley may be used. In addition, the number of sprockets and the layout of the chain and sprockets can be changed as appropriate. Further, the configuration may be such that the first sprocket is moved, or both the first sprocket and the second sprocket may be moved.

1 Transport trolley 2 trolley body 3 Swivel wheel 4 Fixed wheel device 37 Base 38 Arm part 39 Fixed wheel 58 Tensile coil spring (biasing means)
63 First sprocket (guide member)
64 Second sprocket (guide member)
65 toggle clamp (means of transportation)
69 chain (wire)
71 Lifting means

Claims (3)

It is provided with a bogie body, a plurality of free wheels attached to the lower part of the bogie body, a fixed wheel device attached to the lower part of the bogie body, and an elevating means for raising and lowering the fixed wheel device.
The fixed wheel device includes a base attached to the lower part of the bogie body, an arm portion swingably attached to the base, fixed wheels attached to the arm portion, and the base and the above. It is provided with an urging means connected to the arm portion to urge the fixed wheel downward.
The elevating means has a plurality of guide members arranged at the lower part of the bogie body, one end of which is attached to the arm portion side, the other end of which is attached to the base side, and an intermediate portion is guided by the guide member. and wire rod, by moving at least one of said guide member, to adjust the tension of the wire by varying the spacing of the guide member, moving means for lifting the front Symbol fixed vehicle wheels through the wire A trolley for transportation, which is characterized by being equipped with. The transport carriage according to claim 1, wherein the wire rod is in a relaxed state when the universal wheel and the fixed wheel are in contact with the traveling surface at the same time. The transport trolley according to claim 1 or 2, wherein the urging means is arranged so that the direction of the elastic restoring force is parallel to the traveling surface.

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