JP2018079759A - Conveying truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying truck capable of changing the moving direction of the truck without employing an additional fixed wheel.SOLUTION: A fixed wheel changing mechanism 60 changes the restricted moving direction of a part of fixed wheels 40a among a plurality of fixed wheels 40 from a first direction to a second direction, and changes remaining fixed wheels 40b among the plurality of fixed wheels 40 to a free wheel free from the restriction of the moving direction. Therefore, an additional fixed wheel with a moving direction restricted to the second direction is unnecessary to be provided separately from the first fixed wheels 40a with a moving direction restricted to the first direction, allowing the moving direction of a truck 10 to change without employing an additional fixed wheel.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a carriage for use in conveying parts and the like.

  Patent Document 1 is a transporting carriage having a fixed wheel whose movement is fixed only in the vertical direction and a free wheel whose direction is freely changeable. Discloses a transporting carriage that can move in the lateral direction when the fixed wheels for lateral movement are lowered and grounded.

The transportation carriage disclosed in Patent Document 1 has the following problems.
A fixed wheel for lateral movement is required, which is different from a fixed wheel whose movement is fixed only in the vertical direction, and the carriage needs a space for storing the fixed wheel for lateral movement. End up.

Japanese Patent Laid-Open No. 7-40836

The objective of this invention is providing the trolley | bogie for conveyance which can change the moving direction of a trolley | bogie, without using a new fixed wheel.

The present invention for achieving the above object is as follows.
(1) A transport carriage having a plurality of fixed wheels whose movement direction is restricted only in a first direction and free wheels whose movement direction is not restricted,
The movement direction in which some of the fixed wheels are regulated is changed from the first direction to a second direction different from the first direction, and the fixed wheels A transporting carriage provided with a fixed wheel changing mechanism for changing the remaining fixed wheels to free wheels whose movement direction is not restricted.

According to the carrier cart of (1) above, the following effects can be obtained.
The fixed wheel changing mechanism changes the restricted moving direction of some of the fixed wheels from the first direction to the second direction, and the remaining fixed of the plurality of fixed wheels. The wheel is changed to a free wheel whose movement direction is not restricted. Therefore, it is not necessary to newly provide a fixed wheel whose movement direction is restricted to the second direction separately from the fixed wheel whose movement direction is restricted to the first direction. Therefore, the moving direction of the carriage can be changed without using new fixed wheels.

  Since the fixed wheel changing mechanism changes the remaining fixed wheels of the plurality of fixed wheels to free wheels whose movement direction is not restricted, the remaining fixed wheels of the plurality of fixed wheels are also moved in the second direction. Unlike the case where the moving direction is restricted, that is, when all the fixed wheels are restricted by changing the moving direction from the first direction to the second direction by the fixed wheel changing mechanism, the movement of the carriage can only be linear. It is possible to suppress the application of such regulations. Therefore, when it is necessary to correct the track of the bogie, the track of the bogie can be easily corrected.

It is a side view in case the moving direction in which the fixed wheel of the conveyance trolley | bogie of this invention is controlled is a 1st direction. It is a side view in the case where the moving direction in which the fixed wheel is restricted by the fixed wheel changing mechanism is changed to the second direction of the transport carriage of the embodiment of the present invention. It is a bottom view of the trolley | bogie for conveyance in the state of FIG. FIG. 3 is a bottom view of the transport carriage in the state of FIG. 2. It is the schematic of the state in which the moving direction of the remaining fixed wheels of the several fixed wheels in the state of FIG. 1 is controlled by the 1st direction. It is the schematic of the state currently changed to the free wheel of the remaining fixed wheels in the state of FIG. It is a schematic diagram which shows the state which moves a trolley | bogie to a 2nd direction away from a tow vehicle.

  Below, with reference to drawings, the conveyance trolley | bogie of the Example of this invention is demonstrated. In the figure, FR indicates the front of the carriage, and UP indicates the upper side of the carriage.

  A transport cart (hereinafter also simply referred to as a cart) 10 according to an embodiment of the present invention is used for transporting goods such as parts in a factory, and is a traction vehicle or a work in a single state or a plurality of units connected. It is a trolley that is pulled by a person. However, the cart 10 may be a towing vehicle or a cart that is moved by being pushed by an operator.

As shown in FIG. 1, the cart 10 includes a platform part 20, a connecting rod 30, a fixed wheel 40, a free wheel 50, and a fixed wheel changing mechanism 60.

  A load 70 to be transported is placed on the platform 20. As shown in FIG. 3, the platform 20 has a rectangular plate shape with the longitudinal direction of the carriage 10 as the longitudinal direction. The base part 20 has a frame-shaped frame part 21 for increasing strength and rigidity. The frame portion 21 includes front and rear, left and right rectangular frame portions 21a, 21b, 21c, and 21d that are provided along the peripheral edge of the base portion 20, and further, the rectangular frame portions 21a, 21b, 21c, An inner frame portion 21e is provided between the left and right frame portions 21c and 21d in parallel with the front and rear frame portions 21a and 21b. In the illustrated example, three inner frame portions 21e are provided at equal intervals between the front and rear frame portions 21a and 21b. However, at least one inner frame portion 21e may be provided, and two inner frame portions 21e may be provided. It may be the above.

  As shown in FIGS. 1 and 2, the connecting rod 30 is attached to the front end portion of the base portion 20 and the central portion in the left-right direction so as to be rotatable (may be swung) in the vertical direction. The connecting rod 30 may have a one-part configuration or a multi-part configuration. As shown in FIG. 7, the connecting rod 30 is provided to connect the cart 10 to the towing vehicle 80 or the preceding cart. The connecting rod 30 extends in a horizontal direction (including a substantially horizontal direction) forward from the base portion 20 (see FIGS. 1 and 3), and rotates upward from the horizontal position 30a to a vertical direction (substantially vertical). A vertical position 30 b (see FIGS. 2 and 4) extending in a direction (including a direction) is rotatable with respect to the base portion 20.

  The fixed wheel 40 is a wheel whose movement direction is restricted. A plurality of fixed wheels 40 are provided as shown in FIG. The number of the fixed wheels 40 will be described as an example in the case of two in this embodiment and the illustrated example, but three or more may be provided.

The moving direction of the fixed wheel 40 is restricted only in the front-rear direction of the carriage 10. That is, the “first direction” in the claims is the front-rear direction of the carriage 10 in this embodiment. The fixed wheel 40 is provided at the rear end portion of the lower surface of the base portion 20 and at each end portion in the left-right direction. The fixed wheel 40 includes a wheel main body 41 that is grounded and rotates, and a wheel support portion 42 that is attached to the base 20 and supports the wheel main body 41 around the axis of the wheel main body 41. The moving direction of the fixed wheel 40 is restricted by restricting the rotation of the wheel support part 42 relative to the base part 20.

The free wheel 50 is a wheel that can rotate in any direction with respect to the carriage 10 and whose movement direction is not restricted. A plurality of free wheels 50 are provided. The number of the free wheels 50 will be described by taking two cases as an example in the present embodiment and the illustrated example, but three or more free wheels 50 may be provided.

The free wheel 50 is provided at the front end portion of the lower surface of the base portion 20 and at each end portion in the left-right direction. That is, the fixed wheel 40 and the free wheel 50 are provided at the four corners of the lower surface of the platform 20. The free wheel 50 includes a wheel body 51 that is grounded and rotates, and a wheel support portion 52 that is attached to the base portion 20 and supports the wheel body 51 around the axis of the wheel body 51. In the free wheel 50, the rotation of the wheel support part 52 relative to the base part 20 is not restricted.

The fixed wheel changing mechanism 60 changes the restricted moving direction of some fixed wheels of the plurality of fixed wheels 40 from the first direction, that is, the front-rear direction, to the second direction, for example, the left-right direction. This is a mechanism for changing the remaining fixed wheels of the fixed wheels 40 to free wheels whose movement direction is not restricted. In the present embodiment, the case where there are two fixed wheels 40 is described. Therefore, in this embodiment, the fixed wheel changing mechanism 60 changes the restricted moving direction of one fixed wheel (hereinafter referred to as the first fixed wheel) 40a out of the two fixed wheels 40, and the two Among the fixed wheels 40, the remaining one fixed wheel (hereinafter referred to as second fixed wheel) 40b is a mechanism that changes to a free wheel.

The fixed wheel changing mechanism 60 includes a front / rear direction link bar 61 that is movably supported only in the front / rear direction on the platform 20, a connection link mechanism 62 that connects the front / rear direction link bar 61 and the first fixed wheel 40a, And a stopper mechanism 63 for restricting the rotation of the fixed wheel 40b with respect to the base 20.

The front-rear link rod 61 includes a front-rear extension 61a extending in the front-rear direction, and a left-right extension 61b extending to the left and right sides of the rear end of the front-rear extension 61a.

The longitudinally extending portion 61a is an intermediate portion in the longitudinal direction (extending direction) of the longitudinally extending portion 61a, and is supported by a link rod support portion 22 provided on the lower surface of the base portion 20 so as to be slidable in the longitudinal direction. The front end portion of the front-rear direction extending portion 61a may or may not protrude forward from the front end of the base portion 20. The rear end portion of the front / rear extending portion 61a is below the middle portion of the base portion 20 in the front / rear direction, and is located behind the free wheel 50 and ahead of the fixed wheel 40. The longitudinally extending portion 61a is coupled to the coupling rod 30 at a position different from the rotational axis of the coupling rod 30 using a coupling member 61c that is a member constituting the longitudinally extending portion 61a. Accordingly, by rotating the connecting rod 30 from the horizontal position 30a to the vertical position 30b, the front / rear direction link rod 61 can be moved forward with respect to the base portion 20, and the connecting rod 30 can be moved horizontally from the vertical position 30b. By rotating to the position 30 a, the front-rear direction link rod 61 can be moved rearward with respect to the base portion 20.

The left-right direction extending part 61b may be formed integrally with the front-rear direction extending part 61a, or may be formed separately and fixed to the front-rear direction extending part 61a. The left and right direction extending portions 61b are provided to extend from the rear end portion of the front and rear direction extending portion 61a to both sides in the left and right direction. End portions 61b1 and 61b2 in the extending direction of the left and right extending portion 61b are below the base portion 20 and do not protrude outward in the left and right direction from the base portion 20. One end 61b1 in the extending direction of the left and right extending portion 61b is in front of the first fixed wheel 40a, and the other end 61b2 in the extending direction of the left and right extending portion 61b is in front of the second fixed wheel 40b.

The connecting link mechanism 62 connects one end portion 61b1 (including the vicinity thereof) of the extending portion 61b in the left-right direction of the front-rear direction link rod 61 and the first fixed wheel 40a, and the front-rear direction of the front-rear direction link rod 61 This is a mechanism for rotating the first fixed wheel 40a with respect to the pedestal portion 20 in accordance with the movement to.

  The connection link mechanism 62 may have a one-part configuration or a multi-part configuration. The connecting link mechanism 62 is rotatably connected to one end portion 61b1 in the extending direction of the left and right extending portion 61b of the front / rear direction link rod 61 at one end portion. Further, the connecting link mechanism 62 is rotatably connected to the wheel support portion 42 of the first fixed wheel 40a at the other end, or directly via an arm 62a that is a member constituting the connecting link mechanism 62. . As a result, the front / rear direction link rod 61 moves forward to rotate the first fixed wheel 40a from the front / rear direction to the left / right direction with respect to the base portion 20, and the front / rear direction link rod 61 moves rearward. The 1 fixed wheel 40a can be rotated with respect to the base part 20 from the left-right direction to the front-back direction. That is, it is possible to change the restricting direction of the movement of the first fixed wheel 40a. Note that the connecting link mechanism 62 is bent, for example, in a “V” shape in a horizontal plane, and the front-rear direction link bar 61a has a small amount of movement in the front-rear direction, so that it can be viewed from the front-back direction of the first fixed wheel 40a. The amount of rotation in the left-right direction is amplified so as to be obtained reliably.

  The stopper mechanism 63 is a mechanism that locks / unlocks the rotation of the wheel support portion 42 of the second fixed wheel 40b with respect to the base portion 20 as the front / rear link rod 61 moves in the front / rear direction.

As shown in FIGS. 5 and 6, the stopper mechanism 63 extends from the other end 61b2 in the extending direction of the left / right extending portion 61b of the front / rear direction link rod 61 (including the vicinity thereof) to the second fixed wheel 40b side (rear). A stopper piece 63a that extends, a groove 63b that is provided in the wheel support portion 42 of the second fixed wheel 40b and that allows the stopper piece 63a to enter and exit, a stopper piece support portion 63c that supports the stopper piece 63a, and a stopper piece 63a that serves as a stopper A stopper piece urging spring 63d that urges the piece support portion 63c backward (in a direction approaching the second fixed wheel 40b).

  The stopper piece 63a is supported by the other end portion 61b2 in the extending direction of the left and right extending portion 61b of the front / rear direction link rod 61 via the stopper piece supporting portion 63c. Since the stopper piece 63a is supported by the front-rear direction link rod 61, the front-rear direction link rod 61 moves forward, so that the stopper piece 63a can be moved forward and can be removed from the groove 63b. As a result, the stopper piece 63a can be moved backward to enter the groove 63b.

  The groove 63b is formed by recessing (notching) a part of the outer peripheral edge of the wheel support portion 42 of the second fixed wheel 40b. A stopper piece 63a can enter and leave the groove 63b. When the stopper piece 63a enters the groove 63b, the rotation of the second fixed wheel 40b relative to the base 20 is restricted, and the second fixed wheel 40b becomes a fixed wheel whose movement direction is restricted in the front-rear direction. Further, when the stopper piece 63a is removed from the groove 63b, the rotation restriction on the base portion 20 of the second fixed wheel 40b is released, and the second fixed wheel 40b becomes a free wheel whose movement direction is not restricted.

  The stopper piece support portion 63c is provided at the other end portion 61b2 in the extending direction of the left and right extending portion 61b of the front / rear direction link rod 61. The stopper piece support 63c movably supports the stopper piece 63a in the front-rear direction (the direction in which the stopper piece 63a approaches and separates from the second fixed wheel 40b).

  The stopper piece urging spring 63d is, for example, a coil spring. However, the stopper piece biasing spring 63d is not limited to a coil spring, and may be a leaf spring or the like. The stopper piece urging spring 63d returns the second fixed wheel 40b to the fixed wheel whose movement direction is restricted in the front-rear direction again after the stopper piece 63a is removed from the groove 63b and the second fixed wheel 40b becomes a free wheel. Provided for. explain in detail. When the second fixed wheel 40b becomes a free wheel and rotates with respect to the base portion 20, the circumferential position of the groove 63b changes even if the front / rear direction link rod 61 is moved backward, so that the stopper piece 63a cannot enter the groove 63b, and the stopper piece 63a is only pressed against the outer peripheral edge of the wheel support portion 42 of the second fixed wheel 40b by the urging force of the stopper piece urging spring 63. However, when the direction of the second fixed wheel 40b, which is a free wheel, is moved in the front-rear direction by moving the carriage 10 in the front-rear direction, the groove 63b is positioned directly behind the stopper piece 63a, and the stopper piece 63a is The stopper piece urging spring 63d automatically enters the groove 63b by the urging force of the stopper urging spring 63d. Therefore, the 2nd fixed wheel 40b used as the free wheel can be automatically returned to the fixed wheel by which the moving direction was controlled by the front-back direction.

  Here, the operation and effect of the embodiment of the present invention will be described.

(A) When the connecting rod 30 is in the horizontal position 30a (FIGS. 1 and 3)
The first fixed wheel 40a is a fixed wheel whose moving direction is the front-rear direction. Further, the second fixed wheel 40b is a fixed wheel in which the stopper piece 63a of the stopper mechanism 63 enters the groove 63b and the moving direction is the front-rear direction. Since both the first and second fixed wheels 40a and 40b are fixed wheels whose movement direction is the front-rear direction, the cart 10 is pulled by connecting the connecting rod 30 to the towing vehicle 80 or the preceding cart. Can be moved back and forth.

(B) When rotating the connecting rod 30 to the vertical position 30b side (upward) (FIGS. 2 and 4)
When the connecting rod 30 is removed from the towing vehicle 80 or the front carriage and rotated to the vertical position 30b side, the front / rear direction link rod 61 of the fixed wheel changing mechanism 60 is connected to the connecting rod 30. The rod 61 moves forward with respect to the base 20. Accordingly, (a) the connecting link mechanism 62 of the fixed wheel changing mechanism 60 is connected to the front / rear direction link rod 61 and the first fixed wheel 40a. 40a is rotated with respect to the base part 20, and the moving direction in which the first fixed wheel 40a is restricted is changed from the front-rear direction to the left-right direction. In addition, (b) the stopper piece 63a of the stopper mechanism 63 moves forward with respect to the base portion 20 together with the front-rear direction link rod 61, so that it comes out of the groove 63b and the second fixed wheel 40b becomes a free wheel.

  Since the first fixed wheel 40a is a fixed wheel whose movement direction is restricted in the lateral direction and the second fixed wheel 40b is a free wheel, as shown in FIG. Can be thrown in.

(C) When the connecting rod 30 at the vertical position 30b is rotated to the horizontal position 30a (downward), the connecting rod 30 at the vertical position 30b is rotated toward the horizontal position 30a, that is, in FIGS. When the state is changed to the state shown in FIGS. 1 and 3, the front / rear direction link bar 61 of the fixed wheel changing mechanism 60 is connected to the connection bar 30, so that the front / rear direction link bar 61 moves rearward with respect to the base part 20. . Accordingly, (a) the connecting link mechanism 62 of the fixed wheel changing mechanism 60 is connected to the front / rear direction link rod 61 and the first fixed wheel 40a. 40a is rotated with respect to the base part 20, and the movement direction in which the first fixed wheel 40a is regulated is changed (returned) from the left-right direction to the front-rear direction (the original direction, the direction in the state (A)). ). Further, (b) the stopper piece 63a of the stopper mechanism 63 moves backward with respect to the base portion 20 together with the front / rear direction link rod 61, so that it enters the groove 63b and the second fixed wheel 40b restricts the moving direction in the front / rear direction. Fixed wheels (returned). Depending on the orientation of the second fixed wheel 40b, the stopper piece 63a may not enter the groove 63b. However, as described above, when the second fixed wheel 40b faces in the front-rear direction, the stopper piece biasing spring 63d Since the stopper piece 63a automatically enters the groove 63b by the urging force, no problem occurs.

  In the embodiment of the present invention, the fixed wheel changing mechanism 60 changes the movement direction in which some fixed wheels (first fixed wheels) 40a among the plurality of fixed wheels 40 are regulated from the front-rear direction (first direction). While changing to the left-right direction (2nd direction), the remaining fixed wheels (2nd fixed wheel) 40b of the some fixed wheels 40 are changed to the free wheel whose movement direction is not controlled. Therefore, it is not necessary to newly provide a fixed wheel whose movement direction is regulated in the left-right direction (second direction) separately from the first fixed wheel 40a whose movement direction is regulated in the front-rear direction (first direction). Therefore, the moving direction of the carriage can be changed without using new fixed wheels.

  Since the fixed wheel changing mechanism 60 changes the remaining fixed wheel (second fixed wheel) 40b among the plurality of fixed wheels 40 to a free wheel whose movement direction is not restricted, the remaining of the plurality of fixed wheels 40 The fixed wheel (second fixed wheel) 40b is also restricted in the moving direction in the left-right direction (second direction), that is, all the fixed wheels 40 are moved back and forth (first direction) by the fixed wheel changing mechanism 60. Unlike the case where the movement direction is changed from left to right (second direction) and the movement is restricted, it is possible to prevent the movement of the carriage 10 from being restricted only by a straight line. Therefore, when the track of the carriage 10 needs to be corrected, the track of the carriage 10 can be easily corrected.

  The fixed wheel changing mechanism 60 changes the movement direction in which some fixed wheels (first fixed wheels) 40a among the plurality of fixed wheels 40 are restricted from the front-rear direction (first direction) to the left-right direction (second direction). Direction) and the remaining fixed wheels (second fixed wheels) 40b among the plurality of fixed wheels 40 are changed to free wheels whose movement direction is not restricted, so that all the fixed wheels 40 are changed to free wheels. Unlike the case where it does, the direction stability at the time of a movement is bad, and it can suppress that force is needed for the track correction of the trolley | bogie 10. FIG.

  Since the fixed wheel changing mechanism 60 is operated by raising and lowering the connecting rod 30, it is advantageous in terms of space saving of the carriage 10 as compared with a case where another operation member is newly provided. It can suppress that a process increases.

  In the embodiment of the present invention, the connecting rod 30 has a role of an operation lever for operating the fixed wheel changing mechanism 60, but is different from a switch for operating the fixed wheel changing mechanism 60 and the connecting rod 30. An operation lever (both not shown) may be provided to operate the fixed wheel changing mechanism 60.

DESCRIPTION OF SYMBOLS 10 Transfer trolley 20 Base part 21 Frame part 30 Connecting rod 30a Horizontal position 30b Vertical position 40 Fixed wheel 40a 1st fixed wheel 40b 2nd fixed wheel 41 Wheel main body 42 Wheel support part 50 Free wheel 51 Wheel main body 52 Wheel support part 60 Fixed wheel changing mechanism 61 Front / rear direction link rod 61c Connecting member 62 Connecting link mechanism 63 Stopper mechanism 63a Stopper piece 63b Groove 63c Stopper piece support portion 63d Stopper piece biasing spring 70 Luggage 80 Towing vehicle S Space

Claims (1)

A carriage for transportation having a plurality of fixed wheels whose movement direction is restricted only in the first direction and free wheels whose movement direction is not restricted;
The movement direction in which some of the fixed wheels are regulated is changed from the first direction to a second direction different from the first direction, and the fixed wheels A transporting carriage provided with a fixed wheel changing mechanism for changing the remaining fixed wheels to free wheels whose movement direction is not restricted.

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