JPH09315335A - Cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cart having a small difference in inside wheels. SOLUTION: When a tow bar 55 attached on a connection bar 50 which is shaft supported by a shaft 51 is turned in a direction of an arrow R1, the connection plate 52 is turned in a direction of the arrow R1, the connection arm 52 and the connection arm 61b are moved in a direction of the arrow R2 while a right front wheel 40 and a left front wheel are turned to a direction of an arrow L. With the rotation of the connection plate 52 in the direction of an arrow R1, a link plate 64 is turned in a direction of an arrow Y2 so that the link rod 76 is moved in a direction of an arrow F1, and a link plate 72 is shaft supported by a shaft 68 is moved in a direction of an arrow Y4. Consequently, the connection plate 67 is moved in a direction of an arrow R3 so that connection arms 65a and 65b are moved in a direction of an arrow R4, a right rear wheel 44 and a left rear wheel 46 are turned to a direction of an arrow R which is reverse to the direction of the front wheel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley which is suitable for being towed by a towing vehicle to bend a corner of a narrow passage.

[0002]

2. Description of the Related Art As a conventional truck, there is known one in which the front wheels turn in the pulling direction. FIG. 8 shows a state in which a plurality of trucks are connected to a towing vehicle to turn a corner. As shown in the figure, a towing vehicle 92 pulls a plurality of trucks 98 to pass the passage 90.
When the towing vehicle 92 turns to the left while trying to turn left at the corner 96 while traveling on the vehicle, each succeeding truck 98 turns its front wheel to the left and turns to the left.

[0003]

However, in the above-mentioned prior art, since the dolly 98 has an inner ring difference and the turning radius becomes smaller toward the rear dolly, the dolly 98 comes into contact with the wall 93, or the dolly 98 shows an arrow. There is a problem that it may not be possible to turn at the corner 96 by turning in the direction of L5. The above problem can be solved by reducing the number of towings of the carriage 98 or widening the width of the passage 90. For example, when the parts used in the automobile assembly line are conveyed by the carriage 98, When the number of tow trucks 98 is reduced, there arises a problem that the efficiency of component supply is reduced. Further, if the width of the passage 90 is widened, there arises a problem that the area occupied by the passage 90 in the factory increases. In addition, actual Kaihei 4
In Japanese Patent Laid-Open No. 1071-1071, a turning shaft provided on a plurality of wheels is connected to a turning shaft via a link, and a handle is provided on the turning shaft to move the cart in the front-back direction or by operating the handle.
Although there is described a hand truck that can run in the left-right direction, this hand truck is used alone, and it is not possible to solve the problem of reducing the turning trajectory of the connecting carriage. Absent. Further, Japanese Utility Model Publication No. 63-26291 discloses a technique relating to a four-wheel steering system for an automobile, in which front wheels and rear wheels are connected by a link device and the front wheels and the rear wheels are turned in mutually opposite directions. However, this is a four-wheel steering mechanism for a single independent vehicle, and cannot solve the problem of reducing the turning locus when a plurality of vehicles are connected.

Therefore, an object of the present invention is to realize a trolley in which the difference between the inner wheels is reduced by turning the rear wheels in the opposite direction to the front wheels turning in the pulling direction.

[0005]

In order to achieve the above-mentioned object, the present invention provides a cargo bed, a front wheel supporting a front portion of the cargo bed, and a rear portion of the cargo bed according to the first aspect of the invention. In a truck having a rear wheel and a towing member attached to the cargo bed and rotatable in the towing direction of the cargo bed, the front wheel is turned in the turning direction in association with the rotation of the towing member. The technical means is provided that includes front wheel steering means and rear wheel steering means that turns the rear wheels in a direction opposite to the turning direction of the front wheels in association with the rotation of the pulling member.

According to a second aspect of the present invention, in the trolley according to the first aspect, the front wheel steering means includes first rotating means which rotates in association with the rotation of the pulling member. The first rotation means is connected to the front wheel, and the first rotation means is connected to the first wheel.
Front wheel turning means for turning the front wheels in the turning direction of the towing member in association with the turning of the turning means of the turning means, and the rear wheel steering means is provided rotatably on the luggage carrier. Second turning means, and a rear wheel turning means that connects the second turning means and the rear wheel to turn the rear wheel in conjunction with turning of the second turning means. , The first rotating means and the second rotating means are connected to each other so that the second rotating means is interlocked with the first rotating means, and the rear wheel is in the turning direction of the front wheel. The technical means that the interlocking means for turning in the opposite direction is provided.

[0007]

According to the present invention, the front wheel steering means for interlocking with the rotation of the pulling member attached to the bed to turn the front wheels in the rotating direction, and the interlocking movement of the pulling member. Then, there is provided rear wheel steering means for turning the rear wheels in a direction opposite to the turning direction of the front wheels. That is, the rear wheels can be turned in the direction opposite to the turning direction of the front wheels. Therefore, the difference in the inner ring can be made smaller than that in the case where the rear wheel turns in the same direction as the front wheel and the case where the rear wheel does not turn, so that it is possible to turn the corner which could not be bent due to the difference in the inner wheel in the past.

In particular, in the invention according to claim 2, the front wheel steering means includes a first rotating means which rotates in association with the rotation of the pulling member, and the first rotating means. Front wheel turning means is provided for connecting the front wheels and for turning the front wheels in the turning direction of the traction member in conjunction with the turning of the first turning means. Therefore, when the pulling member rotates in the pulling direction, the first rotating means rotates to rotate the front wheels in the pulling direction, so that the loading platform can be directed in the pulling direction.

Further, the rear wheel steering means is provided with a second turning means rotatably provided on the luggage carrier, and the second turning means and the rear wheel are connected to each other to provide the second turning means. The rear wheel turning means for turning the rear wheel in conjunction with the turning of the turning means, the first turning means and the second turning means are connected to each other to form the first turning means. There is provided interlocking means for interlocking the second rotating means and for turning the rear wheel in a direction opposite to the turning direction of the front wheel. Therefore, when the first rotating means is rotated by the rotation of the pulling member, the second rotating means is rotated, and the rear wheel can be turned in the direction opposite to the turning direction of the front wheel. The difference can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view seen from above with the front portion of the truck of the present embodiment left, FIG. 2 is a left side explanatory view of the truck, FIG.
4 is a rear view of the truck, FIG. 4 is a cross-sectional view taken along the line BB of FIG. 1, and FIG. 5 is an enlarged view of the A section of FIG. In the following description, the side with the right rear wheel 44 in FIG.
The side with the left rear wheel 46 is the left side. First frame 20
The configuration of will be described. As shown in FIG. 1, the trolley | bogie 10 is equipped with the frame 20 formed in the rectangular frame shape. The frame 20 is attached to an outer frame 21, a front plate 22 attached to a front portion of the outer frame 21, a central plate 23 attached to the center of the outer frame 21, and a rear portion of the outer frame 21. And the rear plate 24. In the present embodiment, each of the plates is formed by an L-shaped member formed by bending an iron plate-shaped member into an L-shaped cross section.

Between the outer frame 21 and the front plate 22,
Right front wheel mounting base 25, connecting bar mounting base 26,
The left front wheel mounting base 27 is mounted. A right rear wheel mounting base 28, a tow hook mounting base 29, and a left rear wheel mounting base 30 are mounted between the outer frame 21 and the rear plate 24. The right front wheel mount 31 is located below the right front wheel mount base 25, the left front wheel mount 32 is located below the left front wheel mount base 27, and the right rear wheel mount 33 is located below the right rear wheel mount base 28. Rear wheel mounting base 3
A left rear wheel receiver 34 is rotatably attached to the lower part of 0 by a rotary shaft 35.

Now, the wheel mounting structure will be described with reference to the left front wheel with reference to FIGS. 3 and 5. As shown in FIG. 5, the left front wheel receiver 32 includes a plate 32a having a rotary shaft 35 inserted therethrough, a plate 32b vertically formed downward from a rear end of the upper plate 32a, and a rear end of a lower end of the plate 32b. Plate 32 formed horizontally to
c, and plates 32d, 32d each having a substantially inverted triangular shape formed below the right and left sides of the plate 32a.

The left front wheel 4 is provided between the plates 32d and 32d.
A wheel 42a forming part 2 is rotatably supported by a wheel shaft 42b. Further, a wheel bearing 35a having a bearing 35b therein is interposed between the left front wheel mounting base 27 and the plate 32a, and the rotary shaft 35 is inserted through the wheel bearing 35a. That is, the left front wheel 42 can rotate left and right around the rotation shaft 35. Further, the right front wheel 40, the right rear wheel 44, and the left rear wheel 46 also have the same mounting structure as the left front wheel 42, and can rotate right and left around the rotation shaft 35. The left front wheel mounting base 32, the wheels 42
The left front wheel 42 is configured by a and the wheel shaft 42b, and the same applies to the right front wheel 40, the right rear wheel 44, and the left rear wheel 46. Further, in the present embodiment, each of the wheels has a structure in which rubber is formed on the outer circumference of an iron wheel.

Next, the mounting structure of the connecting bar 50 will be described with reference to FIG. A hanging rod 53 having a U-shaped cross section is fixed to the base end of the connecting bar 50.
The base end of the connecting plate 52 is fixed to the upper surface of the.
A shaft 51 is provided on the upper surface of the base end of the connecting plate 52, and a flange portion 51 a formed on the upper surface of the shaft 51.
Is fixed to the lower surface of the connecting bar mounting base 26.
A protrusion 51b is formed on the lower surface of the shaft 51,
The projecting portion 51b penetrates the base end of the connecting plate 52 and is screwed. In addition, the ball bearing 51 is provided at a portion where the inside of the connecting plate 52 and the protruding portion 51b contact each other.
c is interposed. That is, the connecting bar 50 and the hanging rod 5
The 3 and the connecting plate 52 are integrally rotatable with each other about the shaft 51 in the left and right directions (the direction of the arrow L and the direction of the arrow R shown in FIG. 1).

The connecting bar 50 is formed by bending an iron plate member into a square pole shape.
Hinge pin insertion holes 50a, 50a are formed at the tip of the. Of the hinge pin insertion holes 50a, 50a, only the left hinge pin insertion hole 50a is shown in FIG. 5, but in reality, the right hinge pin insertion hole 50a is formed at a position facing the left hinge pin insertion hole 50a. ing. As shown in FIG. 1, both side surfaces of the tip portion of the connecting bar 50 are covered with mounting pieces 55a, 55a formed on both side surfaces of the rear end of the tow bar 55, and the hinge pin insertion holes formed on these mounting pieces are inserted. The hinge pin 54 is inserted in the holes (not shown) and the hinge pin insertion holes 50a, 50a provided in the connecting bar 50.
Is fixed by being inserted, and the tow bar 55 is connected to the connecting bar 50.

That is, the tow bar 55 has the hinge pin 54.
It can be rotated up and down around the axis. Also,
The rear end of the tow bar 55 is supported by the support plate 50b formed to project from the lower surface of the tip of the connecting bar 50, so that the tow bar 55 does not rotate downward from the horizontal position. . Further, a hook 56 attached to a towing member 80 (see FIG. 1) attached to the rear portion of the towing vehicle 92 and the trolley 94 (see FIG. 7) is provided at the tip of the towing bar 55.

Next, the steering mechanism of the carriage 10 will be described. As shown in FIG. 1, a link bolt 62a is attached to the rear upper surface of the right front wheel receiver 31, and one end of a connecting arm 61a is connected to the link bolt 62a. The other end of the connecting arm 61a is connected to a shaft 63 rotatably attached to the upper surface of the rear end of the connecting plate 52. A link bolt 62b is attached to the rear upper surface (plate 32c) of the left front wheel receiver 32, and one end of a connecting arm 61b is connected to the link bolt 62b. The other end of the connecting arm 61b is connected to the shaft 63 described above. That is, in conjunction with the rotation of the connecting plate 52 accompanying the rotation of the connecting bar 50,
The right front wheel 40 and the left front wheel 42 have the same direction and angle.

On the other hand, the rear end of the connecting plate 67 is rotatably fixed to the tow hook mounting base 29 by a shaft 68, and the shaft 6 is attached to the upper surface of the front end of the connecting plate 67.
9 is rotatably attached. Also, the right rear wheel receiver 3
A link bolt 66a is attached to the upper surface of the front part of the connection member 3, and the link arm 65a is attached to the link bolt 66a.
Are connected at one end. The other end of the connecting arm 65a is connected to the shaft 69. A link bolt 66b is attached to the front upper surface of the left rear wheel receiver 34, and one end of a connecting arm 65b is connected to the link bolt 66b. The other end of the connecting arm 65b has a shaft 69.
It is connected to. That is, the right rear wheel 44 and the left rear wheel 46 are oriented at the same angle in association with the rotation of the connecting plate 67.

As shown in FIG. 1, one end of a link plate 64 is fixed to the bearing 51 orthogonal to the connecting plate 52, and a link bolt 70 is attached to the other end of the link plate 64. (See Figure 4). Also,
One end of a link plate 72 is fixed to the shaft 68 at right angles to the connecting plate 67.
A link bolt 74 is attached to the other end of 2.
The link bolt 74 and the link bolt 70 are connected by a link rod 76. That is, the link plate 64 and the link plate 72 are linked by the link rod 76.

The shaft 51, the flange portion 51a, the protruding portion 51
b, the ball bearing 51c, the connecting plate 52 and the hanging rod 53 correspond to the first rotating means of the present invention, and the shaft 68 and the connecting plate 72 correspond to the second rotating means of the present invention. Further, the shaft 63, the connecting arms 61a and 61b, the link bolts 62a and 62b are the front wheel turning means of the present invention, and the shaft 69, the connecting arms 65a and 65b, the link bolts 66a and 66b are the rear wheel turning means of the present invention. The link plates 64 and 72, the link bolts 70 and 74, and the link rod 76 correspond to the interlocking device of the present invention. Further, the tow bar 55 and the connecting bar 50 correspond to the tow member of the present invention.

Next, the operation of each component of the truck 10 will be described with reference to FIGS. 1 and 6. FIG. 6 shows a state in which the tow bar 55 has rotated in the direction of arrow L from the state shown in FIG. When the tow bar 55 rotates in the direction of arrow L (turns left), the connecting bar 50 also rotates in the direction of arrow L, so that the connecting plate 52 rotates in the direction of arrow R1. As a result, the connecting arm 61a is pushed in the direction of arrow R2, and the right front wheel 40 turns in the turning direction L of the tow bar 55. At this time, since the connecting arm 61b is pulled in the direction of arrow R2, the left front wheel 42 is also turned in the turning direction L of the tow bar 55. That is, the right front wheel 40 and the left front wheel 42 are also turned in the arrow L direction (leftward) in conjunction with the rotation (left turn) of the tow bar 55 in the arrow L direction.

On the other hand, since the link plate 64 rotates in the direction of the arrow Y2 in conjunction with the rotation of the tow bar 55 in the direction of the arrow L, the link rod 76 is pushed in the direction of the arrow F1. As a result, the link plate 72 rotates in the arrow Y4 direction, and the connecting plate 67 rotates in the arrow R3 direction. As a result, the connecting arm 65a is pushed in the direction of arrow R4, so that the left rear wheel 44 turns in the direction of arrow R, which is the direction opposite to the direction of rotation of the tow bar 55. At this time, since the connecting arm 65b is pulled in the direction of arrow R4, the left rear wheel 46 also turns in the direction of arrow R. That is, the right rear wheel 44 and the left rear wheel 46 are in the opposite direction to the turning direction of the right front wheel 40 and the left front wheel 42 in association with the rotation (left turn) of the tow bar 55 in the arrow L direction. Turn to the R direction (to the right).

When the tow bar 55 rotates in the direction of arrow R, the right front wheel 40 and the left front wheel 42 move to the tow bar 55.
The right rear wheel 44 and the left rear wheel 46 turn in the direction of the arrow L opposite to the tow bar 55. As described above, according to the bogie 10, the front wheels can be turned in the pulling direction and the rear wheels can be turned in the direction opposite to the pulling direction. That is, the inner ring difference can be reduced.

FIG. 7 shows a state in which a plurality of trucks 94 are connected after the truck 10 and parts are supplied to an automobile assembly line or sheet metal line. As shown in FIG.
However, if you turn left at the corner 96 while traveling through the aisle 90,
The front wheel of 0 turns to the left, but the rear wheel turns to the right,
The front wheels and the rear wheels can always turn left on the same trajectory, that is, without causing a difference in the inner wheels. Therefore, since the plurality of carriages 94 following the carriage 10 are towed in the direction toward the rear of the carriage 10, it is possible to wrap around the same trajectory as the carriage 10 and make a left turn.
It is possible to prevent the contact with No. 3 and the inability to turn left at the corner 96.

As described above, according to the trolley 10, more trolleys than the conventional trolleys can be towed to bend the corners, so that the efficiency of supplying components to the assembly line or the sheet metal line can be improved. it can. In addition, since the corner can be bent even in a narrow passage, the area occupied by the passage in the factory for the assembly line and the sheet metal line can be reduced. The turning angles of the front wheels and the rear wheels can be adjusted by appropriately changing the angle formed by the link plate 64 and the connecting plate 52 or the angle formed by the link plate 72 and the connecting plate 67.

[0026]

As described above, according to the present invention, it is possible to realize a truck with a small inner ring difference.

[Brief description of drawings]

FIG. 1 is an explanatory view seen from above with a front portion of a cart according to an embodiment of the present invention left.

FIG. 2 is a left side view of the truck.

FIG. 3 is a rear view of the dolly.

4 is a cross-sectional view taken along the line BB of FIG.

5 is an enlarged explanatory view of a portion A of FIG. 2. FIG.

FIG. 6 is an explanatory diagram showing a state in which the carriage 10 has rotated in the direction of arrow L from the state shown in FIG.

FIG. 7 is an explanatory diagram showing a state in which a plurality of carriages 94 are connected after the carriage 10 and turn left.

FIG. 8 is an explanatory diagram showing a state in which a plurality of conventional carts are towed and turn left.

[Explanation of symbols]

10 bogie 20 frame 35 rotating shaft 40 right front wheel 42 left front wheel 44 right rear wheel 46 left rear wheel 50 connecting bar 51 shaft 52, 67 connecting plate 55 towing bar 61a, 61b, 65a, 65b connecting arm 62a, 62b, 63, 66a , 66b, 69, 70,
74 link bolt 64, 72 link plate 76 link rod 80 tow hook 90 passage 92 tow vehicle 93 wall 94, 98 bogie 96 square

Claims (2)

[Claims] 1. A luggage carrier, a front wheel supporting a front portion of the luggage carrier, a rear wheel supporting a rear portion of the luggage carrier, and a traction member attached to the luggage carrier and rotatable in a towing direction of the luggage carrier. And a front wheel steering means for turning the front wheels in the turning direction in association with the turning of the towing member, and a direction opposite to the turning direction of the front wheels in association with the turning of the towing member. A rear wheel steering means for turning the rear wheels, and a bogie. 2. The front wheel steering means includes a first rotation means that rotates in association with rotation of the pulling member, the first rotation means and the front wheel are connected to each other, and Front wheel turning means for turning the front wheels in the turning direction of the towing member in association with the turning of the turning means of No. 1, and the rear wheel steering means is turnable to the loading platform. Second rotation means provided, and rear wheel turning means for connecting the second rotation means and the rear wheel to turn the rear wheel in conjunction with the rotation of the second rotation means. And connecting the first rotating means and the second rotating means so that the second rotating means is interlocked with the first rotating means, and the rear wheel is turned to the front wheel. The trolley according to claim 1, further comprising: interlocking means for turning in a direction opposite to the direction.