JPH0647075U - Carrier - Google Patents

Abstract

(57) [Summary] [Purpose] A trolley with multiple wheels on the underside of the pedestal, which moves forward when towed, but can also be moved to the left or right as necessary, for example, when it is moved to the left. It can be so. [Structure] The pedestal 12 is provided with free wheels 16, 18 on the front side, and a fixed wheel 20 and a free wheel 22 are provided on the rear side, and the pedestal 12 is rotated in the left-right direction at an intermediate position between the free wheel 16 and the fixed wheel 20. Lifting wheels 24 are provided, and lifting wheels 24 are used during towing.
Is positioned at a retracted position where it does not come into contact with the floor surface, and is stably towed by the other four wheels. At the time of width-shifting, the lift-up mechanism 50 causes the lifting wheel 24 to protrude toward the floor surface to fix the fixed wheel 20 and the universal wheel 16 to the floor. It is located at an operating position where it is floated from the surface, and the three wheels including the lifting wheels 24 support the carrier 10 to move it in the left-right direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carrier truck on which an object to be transported such as a work is towed, and more particularly, to a structure of a carrier truck capable of changing a carrying direction.

[0002]

[Prior art]

 In an automobile assembly line, etc., when supplying a relatively large number of workpieces to the assembly area in an appropriate number, a plurality of trolleys carrying the workpieces are connected and pulled by a towing vehicle such as a tractor to a predetermined size. It is carried out along the transportation route. The carriage used in this case includes a pedestal on which a work (object to be transported) is placed, and a plurality of wheels arranged on the lower, front, rear, left, and right sides of the pedestal. Such a plurality of wheels are provided on the left and right sides of the front of the pedestal and rotate in a desired direction on the floor, and a pair of wheels are provided on the left and right sides of the rear of the pedestal. It is often composed of a pair of fixed wheels that rotate above the pedestal only in the front-back direction. FIG. 15 is a schematic view showing an example of such a carriage, and a pair of free wheels 116 and a pair of fixed wheels 120 arranged under the pedestal 112 are used in the pulling direction indicated by the white arrow in the figure. Each carrier truck can run smoothly along almost any transportation route. The reason why the rear wheels are fixed wheels is to prevent each carriage from slipping laterally and deviating from the transportation route when a plurality of carriages are connected and towed.

[0003]

[Problems to be solved by the device]

 However, such a conventional carriage cannot change the carrying direction from the front-back direction of the pedestal to the right-left direction at right angles to it at any time. For example, after being separated from the towing vehicle on a transportation route that is separated from the assembly line by a certain distance, it is structurally necessary to move the vehicle closer to the assembly line in the direction perpendicular to the immediately preceding traveling direction. Have difficulty. That is, since the pair of fixed wheels rotate without resistance in the front-rear direction of the pedestal, but cannot rotate in the direction substantially perpendicular thereto, the front portion of the pedestal on which the pair of free wheels are disposed cannot be moved. However, the rear part where the fixed wheel was installed was not able to move laterally, and the only way to move the width was to move it back and forth little by little.

The present invention has been made in view of the above circumstances. The purpose of the present invention is to advance to the front when towing, but to move it to the left and right as necessary, for example, when pulling the vehicle. Is to be able to.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the gist of the present invention is that a pedestal on which an object to be transported is placed and a plurality of wheels arranged on the lower surface side of the pedestal are provided, and the vehicle is towed by a towing vehicle or an operator. And (a) a pair of front free wheels that are respectively disposed on the left and right sides of the front side of the pedestal and that rotate in an arbitrary direction on the floor surface. (B) a fixed wheel that is arranged on either the left or right side of the rear side of the pedestal and rotates on the floor only in the front-back direction of the pedestal; and (c) the fixed ring on the rear side of the pedestal. A rear free wheel which is disposed on the opposite side in the left-right direction and rotates in any direction on the floor surface; and (d) an intermediate position in the front-rear direction of the pedestal and the same as the fixed wheel in the left-right direction. It is located on the side and the evacuation means prevents the floor from contacting the floor. And a state in which one of the fixed wheel and one of the front self-supporting wheels located on the same side as the fixed wheel in the left-right direction is floated from the floor surface while protruding downward from the retracted position and abutting on the floor surface. And an elevator wheel that can be rotated at least in the left-right direction of the pedestal on the floor surface in the operating position.

[0006]

[Action]

 In the above-mentioned carrier, when the lifting wheels are located at the retracted position, the pedestal is supported by four wheels: a pair of front free wheels on the front side of the pedestal and a fixed wheel and a rear free wheel on the rear side of the pedestal. Therefore, even when a plurality of trolleys are connected and towed, each of the trolleys is towed while changing the direction in an arbitrary direction by the action of the front free wheel, and the route deviates due to the sideways action by the action of the fixed wheel. Is prevented and the vehicle is towed well following the towing vehicle. On the other hand, when the lifting wheels are located in the operating position, the pedestal is supported by the other of the front free wheels, the rear free wheels, and the lifting wheels, and the lifting wheels move on the floor surface at least in the left-right direction of the pedestal. Since it can rotate, it is possible to move the transport cart in parallel in the left-right direction.

[0007]

[Effect of device]

 As described above, according to the transporting vehicle of the present invention, by arranging the lifting wheels at the retracted position, it is possible to favorably pull them by the towing vehicle or the like in a state in which a plurality of the lifting wheels are connected, and the lifting wheels are moved to the operating position when necessary. It is possible to make parallel movement in the left-right direction by positioning it at, which greatly improves operability.

[0008]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an outline of a carrier 10 according to an embodiment of the present invention and its usage, and is on a carrier path C beside a component supply space B provided in front of an assembly line A. This is a state in which a plurality of carrier vehicles 10 are connected and towed. The carrier vehicle 10 is loaded with a large number of assembly parts (not shown) that are objects to be transported at other places, and is towed by a towing vehicle (not shown) to carry these assembly parts along a predetermined transport route C. As indicated by the solid line 1 in Fig. 1, the part is separated from the towing vehicle on the transport route C, and from that state, it is moved by the operator to the position shown by the chain double-dashed line in the part supply space B, and the assembly parts are attached to the assembly line A. Are to be supplied. The outline arrow direction in FIG. 1 indicates the pulling direction, and the broken arrow indicates the width-shifting direction.

FIG. 2 is a bottom view showing a part of the carriage 10 in which a pedestal 12 of the carriage 10 is composed of a base frame 14 formed of a steel material such as a square steel pipe into a rectangular frame shape. The longitudinal direction is the front-back direction that matches the pulling direction. The base frame 14 includes a pair of vertical members 14a arranged in the front-rear direction on both left and right (upper and lower sides in the figure), and a pair of vertical members 14a connecting the front end and the rear end of the vertical member 14a. The horizontal member 14b and the horizontal member 14c which connects a pair of vertical members 14a in the center of the front-back direction are provided. A plurality of wheels (a total of five in this embodiment) are arranged at the four corners of the lower surface of the base frame 14 and at the upper portion of the lateral member 14c in FIG. Specifically, on the front side in the pulling direction, that is, on the left side in FIG. 2, front free wheels 16 and 18 that can rotate on the floor surface in any direction (in FIG. 1, left side in the pulling direction is 16 and right side is 18). 2 is disposed on the rear side of the pulling direction, that is, on the right side of FIG. 2, a fixed wheel 20 that is rotatable only on the floor in the front-back direction and a rear side that is rotatable on the floor in any direction. A free wheel 22 (in FIG. 1, the left side with respect to the pulling direction is 20 and the right side is 22) is provided, and further, at an intermediate position in the front-rear direction and on the same side as the fixed wheel 20 in the left-right direction. Elevating wheels 24 are provided that are rotatable on the floor surface only in the left-right direction.

FIG. 3 is a perspective view seen from above the front side of the carriage 10. As shown in the drawing, the base frame 14 has a front end portion, a rear end portion, and an intermediate portion on the pair of vertical members 14a. A column member 26 is erected at each of the above positions, and a pair of beam members 28 are integrally fixed to the column member 26 substantially horizontally in the front-rear direction. A large number of component receiving members 30 are fixedly mounted on the beam member 28 at predetermined intervals in the front-rear direction. These many component receiving members 30 are made of plastic foam and are resin-molded in advance in conformity with the shape of the assembling components, and even during transportation, the many assembling components do not interfere with each other and are stable. It is supposed to be retained. The beam member 28 on the right side in FIG. 3, that is, on the left side with respect to the pulling direction, is provided with a handle 32 for being gripped by an operator and moving the carriage 10 manually. A mesh net 34 made of wire material such as wire is stretched on the upper surface of the base frame 14.

On the other hand, as shown in each of the above figures, connectors 36 and 38 for connecting the carriage 10 are respectively provided at the front and rear ends of the pedestal 12 so as to project forward and backward from the pair of lateral members 14b. Are arranged. FIG. 4 is a perspective view of the connector 38. The connector 38 is fixed to the lower rear of the lateral member 14b via a bracket 40. At the time of connection, the connector 38 of the carriage 10 located at the front and the connector 36 of the carrier 10 located at the rear are brought close to each other, and the engaging member 42 of the connector 36 is fitted into the fitting hole 44 of the connector 38. When the pin 46 is positioned and the pin 46 is inserted from above, both can be connected so as to be relatively rotatable about the pin 46. In addition, the connector 36 is configured such that the engaging member 42 can be retracted and stored inside.

FIGS. 5 to 7 show the lifting means for positioning the lifting wheels 24 in the retracted position where they do not come into contact with the floor surface 48 and the operating position where they project downward from the retracted position and contact the floor surface 48. It is a figure which shows the lift-up mechanism 50 as this. 5 is a cross-sectional view seen from the front end side of the pedestal 12, FIG. 6 is a bottom view seen from the floor surface 48 side, and FIG. 7 is a VII-VII cross-sectional view in FIG. It shows the state of being positioned. In these drawings, the lifting wheels 24 are rotatably supported by bearings (not shown) around a shaft 54 supported at both ends by the saddle-shaped member 52, and the shaft 54 is parallel to the front-back direction of the pedestal 12. Since the saddle-shaped member 52 is fixedly mounted on the rotating base 56 so that the floor surface 48 comes into contact with the floor surface 48 (see FIG. 8) when the saddle member 52 is positioned at the operating position, the floor surface It is designed so that it can rotate on the left and right directions that are perpendicular to the front-back direction. The rotating base 56 has a pin 58 penetrating one end thereof in the front-rear direction of the pedestal 12 and rotatably supported around a shaft center by a pair of brackets 60 fixed to the lateral member 14c. It is arranged rotatably around the pin 58, and the lifting wheels 24 are moved up and down between the retracted position and the operating position as the other end is moved up and down.

A pair of brackets 66 is fixedly provided on the lower side of the vertical member 14a of the base frame 14, and a rotary shaft 68 parallel to the pin 58 is pivotally supported about an axis. A pedal 64 is integrally fixed to the rotating shaft 68 so that the pad 62 at the tip end extends outward from the pedestal 12 in the left-right direction, and the pedal 64 can be rotated around the rotating shaft 68. There is. A pin 70 is fixedly provided in the middle of the pedal 64 in parallel with the pin 58, and a pair of bearings 72 are arranged on the pin 70 so as to be located on both sides of the pedal 64. . On the other hand, a pair of U-shaped guide members 76 mounts the pedal 64 on the upper surface of the rotating base 56 on the other end side so that a guide groove 74 having a predetermined width is formed between the upper surface and the upper surface. The bearings 72 are sandwiched and the pair of bearings 72 are engaged inside the pair of guide members 76, respectively.

A pair of tension coil springs 78 are stretched between the pair of guide members 76 and the column member 26 via locking members 80 and 82, and the tension coil springs 78 are used to rotate the base 56. 5 is urged so as to rotate counterclockwise of the pin 58 in FIG. 5, so that the lifting wheels 24 are positioned at the retracted position where they are floated from the floor surface 48, as shown in FIG. However, when the pedal 64 is depressed against the biasing force of the tension coil spring 78, the pedal 64 rotates clockwise in FIG. 5 and the bearing 72 presses the upper surface of the rotation base 56. As the rotary base 56 rotates to the right in FIG. 5 as it rolls to the left side of the figure, the lifting wheels 24 project downward and abut the floor surface 48. The turning force of the turning base 56 at this time is determined by the lever ratio of the distance between the turning shaft 68 and the pad 62 in the pedal 64 and the distance between the turning shaft 68 and the pin 70, and the turning shaft 6 on the pedal 64 side. Since the lever ratio of the distance between the 8-pin 70 and the distance between the contact point between the pin 58 and the bearing 72 on the side of the rotation base 56 and the intersection angle thereof is amplified at a high magnification, the operation pedal force at the time of lift-up is increased. The burden is relatively small. When the bearing 72 moves to the moving end on the left side in FIG. 5 in the guide groove 74, the pedal 64 reaches a position where the pedal 64 has surpassed the point of consideration of rotation, and a so-called toggle mechanism self-locking action is obtained. The bearing 72 remains at the left side moving end even if the stepping force is released. In FIG. 8 showing this state, the lifting wheels 24 are located at the operating position, and the fixed wheel 20 and the front free wheel 16 on the same side as the lifting wheels 24 in the left-right direction of the pedestal 12 are removed from the floor surface 48. It will be in a floating state.

That is, in a state where the pedals 64 of the lift-up mechanism 50 are pulled up and the lifting wheels 24 are located at the retracted position, the pair of front side own wheels 16 and 18 on the front side of the pedestal 12 and the rear rear wheels of the pedestal Since the pedestal 12 is supported by the four wheels of the fixed wheel 20 and the rear free wheel 22 on the side, the plurality of connected carriages 10 are oriented in any direction by the action of the front free wheels 16 and 18, respectively. While being pulled, the fixed wheel 20 prevents the vehicle from deviating from the transportation route due to sideways movement, and the vehicle is towed well following the towing vehicle. On the other hand, when the ascending / descending wheel 24 is positioned at the operating position by depressing the pedal 64, the fixed wheel 20 and the free wheel 16 are floated from the floor surface 48, and the pedestal 12 is moved to the front free wheel 18 and the rear wheel. It is supported by the three wheels of the universal wheel 22 and the lifting wheels 24, and since the lifting wheels 24 can rotate on the floor 48 in the left-right direction of the pedestal 12, the rotational directions of the universal wheels 18, 22 change. Thus, the carriage 10 can be moved in parallel in the left-right direction.

Thus, when a plurality of connected carriages 10 are towed by the towing vehicle to the position shown by the solid line in the transportation route C in FIG. 1, a large amount of transportation is performed with each lifting wheel 24 being in the retracted position. In addition, when the operator moves the carriages 10 to the positions shown by the chain double-dashed line in the component supply space B, the elevator wheels 24 are respectively placed in the operating positions so that the left and right directions are maintained. It is easy to move the parts to other parts, greatly improving the operability and efficiency in parts supply. Note that this horizontal movement may be performed by separating the plurality of carriages 10 into one when the number of workers is one, and connecting the carriages 10 when there are multiple workers. It can be done as it is.

Further, in the lift-up mechanism 50 arranged in the carriage 10, the operation pedal force when the pedal 64 is stepped on to perform lift-up is amplified at a high ratio, so that the lift-up mechanism 50 is relatively large. Even when a heavy assembly component is loaded, the operator can easily lift up the carrier 10 and the self-locking operation of the toggle mechanism can maintain the operating position of the lifting wheels 24. Even in this respect, excellent operation performance and safety performance can be obtained.

Next, another embodiment of the present invention will be described. The same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

9 to 13 are views showing details of a mode in which a lift-up mechanism 51, which is an improvement of the lift-up mechanism 50, is provided as an elevating means, and FIG. 9 is seen from the front end side of the pedestal 12. 10 is a bottom view seen from the floor 48 side, FIG. 11 is a cross section seen from the rear end side of the pedestal 12, and FIG. 12 shows the lifting wheels 24 in the operating position in FIG. FIG. 13 is a sectional view taken along line XIII-XIII in FIG. In these figures, one end of a pin 59 rotatably supported by the pair of brackets 60 in a state of penetrating one end of the rotation base 56 extends toward the front of the pedestal 12. At the same time, a pin 71 fixedly provided in the middle of the pedal 65 and pivotally supporting the pair of bearings 72 has one end extending in the front direction of the pedestal 12, and the pin 71 with respect to the rotation base 56. A damper 84 is disposed between the pin 59 and the pin 71 on the front side of the pedestal 12, that is, on the upper side of the rotation base 56 in FIG. The damper 84 has a damping action when the rod 86 is pulled out from the main body side, and when the rotating base 56 is rotated counterclockwise in FIG. 9 by the urging force of the tension coil spring 78. Functions to absorb the shock of. This prevents an impact load from being applied to the bearing 72, prevents generation of impact noise, and improves the life of the device.

On the other hand, the pedal 65 provided with the pad 63 exclusively for stepping operation is rotatably supported around a shaft by a pair of brackets 67 fixed to the lower side of the vertical member 14 a of the base frame 14. It is integrally fixed to the rotating shaft 69. The rotating shaft 69 has one end extending rearward in the rear direction of the pedestal 12 and an engaging portion 88 bent into a hook shape at the tip end side thereof. With the rotation, it is rotated to the positions shown in FIGS. 11 and 12, respectively. A release pedal 90 is provided on the side opposite to the damper 84 with the turning base 56 interposed therebetween, that is, on the lower side of the turning base 56 in FIG. It is arranged at a position corresponding to the joining portion 88. The release pedal 90 can be pulled up like the pedal 64 in the above-described embodiment by rotating the rotary shaft 69 together with the engaging portion 88 clockwise in FIG. 12 by depressing the pedal. Instead, it is for moving the lifting wheels 42 from the operating position to the retracted position. As apparent from FIGS. 10 and 13, the release pedal 90 integrally includes a pair of pins 92 in the front-rear direction of the pedestal 12, and the pair of pins 92 are fixed to the vertical member 14a. The release pedal 90 can be rotated in the same plane as the engaging portion 88 by being rotatably supported by the bracket 94 so as to be rotatable about an axis parallel to the rotating shaft 69.

In the state shown in FIG. 12 in which the lifting wheels 24 are in the operating position, the stepping end portion 96 of the release pedal 90 is held in the rotating position where it is in a state of being projected outward in the left-right direction of the pedestal 12. Further, the release pedal 90 is engaged with the engaging portion 88 of the rotating shaft 69. On the other hand, in the state of FIG. 11 in which the lifting wheels 24 are in the retracted position, the engaging portion 88 is engaged with the release pedal 90 when the pedal 65 is stepped on while the foot end 96 is located relatively downward. In order to be able to rotate, the release pedal 90 has its own weight brought into contact with the rotation shaft 69 at the position defining end 98 on the opposite side of the stepping end 96. That is, the release pedal 90 can be rotated in the direction opposite to the rotation of the pedal 65, and the release pedal 90 can be alternately depressed corresponding to the position of the lifting wheels 24. is there.

In this case, when the lifting wheels 24 are in the operating position, the force corresponding to the weight of the pedestal 12 causes the pedal 65 to rotate toward the retracted position due to the self-locking action of the toggle mechanism. The pin 71 and the pin 71 that rotate together with the engaging portion 88 are actuated in the hindrance direction, but by releasing the release pedal 90 to rotate the engaging portion 88 clockwise from the position of FIG. When the bearing 72 moves in the guide groove 74 and goes over the thought point, the force of the self-locking action reverses and acts in the unlocking direction to urge the pedal 65 toward the retracted position. Therefore, the rotation base 56 is rotated until the weight of the pedestal 12 is supported by the fixed wheel 20 and the front free wheel 16. It should be noted that the engagement between the release pedal 90 and the engaging portion 88 is maintained at least until the point of getting over the above consideration. Then, thereafter, it is rotated exclusively by the urging force of the tension coil spring 78, and the ascending / descending wheel 24 is completely moved to the retracted position while the momentum is absorbed by the damping action of the damper 84. At this time, the operation pedal force is amplified by the lever ratio of the lever ratio of the distance between the pin 92 and the stepping end portion 96 of the release pedal 90 and the distance between the pin 92 and the engaging point of the engaging portion 88. It is possible to easily release the lock by depressing the release pedal 90 against the self-locking force.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above-described embodiment, the posture of each of the carrier vehicles 10 in the component supply space B of FIG. 1 is the same as that of when the vehicle is towed, but the lifting wheels 24 are located at the operating position. In this case, since it is possible to rotate the carriage 10 around the lifting wheels 24 while moving it in the left-right direction, for example, when moving the carriage 10 from the carriage route C to the component supply space B ′, as shown in FIG. In addition to disconnecting the carriages 10 from each other in advance, the carriages 10 can be moved in an arc in the component supply space B ', and the carriages 10 can be easily and quickly moved to the positions shown by the two-dot chain lines in the figure. Both are possible. In such a case, the carriage 10 can be sequentially moved to the front of the assembly area D in the assembly line A to supply the components.

Further, in the above-described embodiment, the lifting wheels 24 which are rotatable on the floor surface only in the left-right direction of the pedestal 12 are provided, but the floor surface is also supported in other directions including the left-right direction. There is no problem even if an elevating wheel that can rotate is installed. For example, when the free wheel is arranged as an elevating wheel, it is possible to move the elevating wheel in the front-rear direction without positioning it in the retracted position after the width is adjusted to the state shown by the chain double-dashed line in FIG. Therefore, as shown in FIG. 14, parts can be supplied by sequentially sending the carts to the assembly area D.

Further, in the above-described embodiment, the lift-up mechanism 50 using the rotation base 56 and the pedal 64, or the lift-up mechanism 51 in which the damper 84 and the release pedal 90 are added to the lift-up mechanism 51 is configured as the elevating means. However, various known mechanisms such as a jack type and a manual hydraulic type may be used in place of the lift-up mechanisms 50 and 51 as long as the lifting mechanism can obtain a boosting effect to some extent.

Further, in the lift-up mechanisms 50 and 51 in the above-described embodiment, the self-locking action for holding the elevator wheels 24 in the operating position is obtained, but the above self-locking action is not necessarily obtained. It is not necessary to be provided, and various lock mechanisms may be additionally provided according to the lifting wheels. Further, although the lifting wheel 24 is held in the retracted position by the urging force of the tension coil spring 78, other urging means or locking mechanism may be provided.

Further, in the lift-up mechanism 51 in the above-described embodiment, the release pedal 90 rotates the rotating shaft 69 until the pin 71 and the bearing 72 pass the imaginary point from the state where the lifted wheel 24 is located at the operating position. In addition to this, a release pedal having, for example, a cam groove or a cam surface that engages with the pin 71 is rotatably provided on the rotation base 56, and the release pedal is depressed. It is also possible to configure so that the pin 71 is pulled toward the moving end on the right side of FIG. 9 in accordance with the inserting operation.

Further, in the lift-up mechanism 51 in the above-described embodiment, the damper 84 is disposed between the pin 59 and the pin 71, but the locking end of the damper 84 on the pin 59 side is the base frame 14. The horizontal member 14c may be connected to an arbitrary position, or the locking end on the pin 71 side may be connected to an arbitrary member that rotates together with the rotating shaft 69.

Further, in the above-described embodiment, only one lifting wheel 24 is disposed below the lateral member 14c at the center of the pedestal 12 in the front-rear direction, but the fixed wheel 20 and the front side in the front-rear direction are freely movable. It is sufficient that the pedestal 12 can be supported regardless of how many elevating wheels are arranged at an intermediate position with respect to the wheel 16, and the arrangement position and the number of elevating wheels can be appropriately changed. As for wheels other than the elevating wheels, it is possible to additionally provide free wheels and fixed wheels as long as they do not hinder the movement of the pedestal 12.

Although not illustrated one by one, the present invention can be carried out in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of a carrier truck according to an embodiment of the present invention and a usage state thereof.

FIG. 2 is a bottom view showing a part of the carrier truck of FIG.

FIG. 3 is a perspective view of the carrier of FIG. 1 seen from the front upper side.

FIG. 4 is a perspective view showing one of the couplers in the carrier of FIG. 1.

5 is a view for explaining a lift-up mechanism provided in the transport carriage of FIG. 1, and is a cross-sectional view showing a state in which lifting wheels are located at a retracted position.

FIG. 6 is a bottom view of the lift-up mechanism of FIG.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a cross-sectional view showing a state where the lifting wheels are located at the operating position by the lift-up mechanism of FIG.

9 is a view showing another embodiment of the present invention and is a cross-sectional view corresponding to FIG. 5 for explaining another aspect of the lift-up mechanism provided in the carriage of FIG.

FIG. 10 is a bottom view of the lift-up mechanism of FIG.

11 is a cross-sectional view of the lift-up mechanism of FIG. 9 viewed from the rear end side of the pedestal.

FIG. 12 is a cross-sectional view showing a state in which the lifting wheels are located at the operating position by the lift-up mechanism of FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a plan view showing an outline of different usage states of the carrier of FIG. 1.

FIG. 15 is a plan view illustrating an example of a conventional carrier truck.

[Explanation of symbols]

 10: Carrier 12: Pedestal 16, 18: Front free wheel 20: Fixed wheel 22: Rear free wheel 24: Lifting wheel 48: Floor surface 50, 51: Lift-up mechanism (lifting means)

Claims (1)

[Scope of utility model registration request] 1. A carrier for transporting an object to be transported, comprising: a pedestal on which an object to be transported is mounted; and a plurality of wheels arranged on a lower surface side of the pedestal, the vehicle being towed by a towing vehicle or an operator. A trolley, which is disposed on each of the left and right sides of the front side of the pedestal, and which is disposed on either one of the left and right sides of the rear side of the pedestal, which is a pair of front free wheels that rotate on the floor surface in any direction A fixed wheel that rotates on the surface only in the front-rear direction of the pedestal, and a rear free wheel that is disposed on the rear side of the pedestal on the side opposite to the fixed wheel in the left-right direction and that rotates on the floor surface in any direction. And an intermediate position in the front-rear direction of the pedestal and on the same side as the fixed wheel in the left-right direction, and by the elevating means, a retracted position that does not contact the floor surface and a downward protrusion from the retracted position. Contacting the floor surface, and The front free wheel, which is located on the same side as the fixed wheel in the left-right direction, is positioned in an alternative to an operating position in which one of the front free wheels is floated from the floor surface, and in the operating position, at least the floor surface is at least A carrier truck having lift wheels that can rotate in the left-right direction of the pedestal.