JP2010095143A - Truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a truck having wheels in at least four corners of a deck and capable of suppressing the generation of meandering and also the generation of inner wheel difference and outer wheel difference in a simpler constitution. <P>SOLUTION: The first and third sets of casters from a front direction are universal casters JC, the second set of casters from the front direction are fixed casters KC, and the first set of casters are mounted on the deck 10. Right side casters of the second sets and the third sets and left side casters of the second set and the third sets are mounted on each of connecting members RB arranged in the longitudinal direction, respectively. Each of the connecting members includes a shaft member J1 having a rotary shaft extending in a right and left direction at a substantially center of the longitudinal direction in the connecting members, and is divided into a front connecting member FR located on a front side of the shaft member and a rear connecting member RR located on a rear side of the shaft member. Rotation in a direction for approaching to the deck 10 is regulated with a regulation means SU provided in advance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a carriage that is used for transporting luggage and that is pulled by a towing vehicle in a single state or in a state in which a plurality are connected.

Conventionally, at production sites such as factories and luggage collection and delivery centers, parts and luggage are carried on one or more trucks connected to the towing vehicle, and each truck has a trajectory of the towing vehicle. Is towed to trace.
In a general cart wheel configuration, casters are provided at the four corners. The front and left and right swivel wheels can turn in any direction, and the rear and right and left wheels are fixed to the front and rear. A fixed caster is provided. However, this configuration is the same as the configuration of the wheels of a passenger car, and an inner ring difference always occurs when turning left and right. There are cases where towed vehicles travel in narrow passages, etc., especially when there are a large number of connected trolleys. is there.

  Therefore, in the prior art described in Patent Document 1, as shown in the example of FIG. 5A (plan view), one free caster JC is provided at the front central portion in the traveling direction of the carriage 100, and the rear central portion is provided. A cart 100 having a four-wheel configuration has been proposed in which one universal caster JC, a position between the front and rear universal casters JC, and a pair of fixed casters KC on the left and right sides of the center of gravity G of the cart 100 are provided. In this bogie 100, the track does not bulge outward during turning even at the end of the connection (in addition, the occurrence of an inner ring difference is suppressed by the front and rear free casters JC). 5A to 5C, the X-axis is the pulling direction (the horizontal direction, indicating the front-rear direction), the Z-axis is the vertically upward direction, and the Y-axis is the direction perpendicular to the X-axis and the Z-axis ( The horizontal direction indicates the left-right direction).

  Moreover, in the prior art described in Patent Document 2, as shown in the example of FIG. 5B (plan view), the free casters JC are provided at the four corners of the carriage 110, and are provided in the front part of the carriage to be pulled. A four-wheel configuration that mechanically steers the traveling direction of each universal caster JC according to the direction of the traction arm AR via link members LF, LR, LL from the traction arm AR (connection member) that moves to the left and right according to A dolly 110 has been proposed. In this carriage 110, each of the four wheels is steered to an appropriate steering angle in accordance with the direction of the traction arm AR, and both the inner wheel difference and the outer wheel difference are suppressed. In addition, when the hand is pushed, a switching mechanism is provided that fixes the front wheels in the traveling direction and allows the rear wheels to rotate in the horizontal direction.

Further, in the prior art described in Patent Document 3, as shown in the example of FIG. 5C (side view), a total of six casters, each paired at three locations in the front-rear direction of the traveling direction of the carriage 120, are provided. The two sets of casters located at the front and rear ends are set as the free casters JC, and the middle set of casters is set as the fixed casters KC. During normal conveyance, the intermediate fixed caster KC is pushed down so as to protrude below the other free casters JC, and the four free casters JC and the two fixed casters KC at the front and rear ends are provided. During the nesting operation, the intermediate fixed caster KC is lifted above the other universal casters JC so that the four universal casters JC at the front and rear ends are grounded. A cart 120 that can be switched between nesting operations has been proposed (the configuration is six wheels or the grounding is four wheels).
JP 2005-96602 A JP-A-2005-75063 JP 2006-321412 A

In the prior art described in Patent Document 1 (see FIG. 5A), the occurrence of the inner ring difference and the outer ring difference is suppressed and the meandering is also suppressed. However, since there are no wheels at the four corners of the loading platform, When an object is relatively heavy, if the load is biased to any of the four corners of the loading platform, the loading platform may be inclined and the loaded item may fall. Therefore, when the front and rear universal casters JC are paired on the left and right, and the universal casters JC are arranged at the four corners, and the cart is composed of six casters together with the intermediate fixed casters KC, the carriage will meander even if pulled straight and stable. do not do. (In order to avoid this, in the prior art described in Patent Document 3 (see FIG. 5C), the two free casters JC and the two fixed casters KC are grounded during normal transportation. ) Further, a cart having only four universal casters JC arranged at the four corners meanders even if it is pulled straight and is not stable.
Moreover, in the prior art described in Patent Document 2 (see FIG. 5B), the occurrence of an inner ring difference and an outer ring difference is suppressed and meandering is suppressed, but the structure is complicated.
In the prior art described in Patent Document 3 (see FIG. 5C), the two free casters JC and the two fixed casters KC are grounded during normal transportation. An outer ring difference will occur.
The present invention was devised in view of the above points, and has wheels at least at the four corners of the cargo bed, and with a simpler structure, the occurrence of meandering is suppressed, and the occurrence of an inner ring difference and an outer ring difference also occurs. It is an object to provide a cart that can be suppressed.

As means for solving the above-mentioned problems, the first invention of the present invention is a cart as described in claim 1.
The cart according to claim 1 is a cart provided with three sets of a loading platform and a pair of casters on the right and left sides in the front-rear direction. The second set of casters from the front is a fixed caster in which the direction of the wheels is fixed in the front-rear direction, and the first set of casters is attached to the loading platform.
The second set and the third set of casters are the front and rear of the second set of right casters and the third set of right casters, and the second set of left casters and the third set of left casters. Attached to each of the connecting members arranged in the direction, each of the connecting members comprises a shaft member having a pivot shaft extending in the left-right direction at a substantially central portion in the front-rear direction of the connecting member, It is divided into a front connecting member located on the front side with respect to the shaft member and a rear connecting member located on the rear side with respect to the shaft member.
The second set of casters is attached to the front of the front connecting member, the third set of casters is attached to the rear of the rear connecting member, and each of the shaft members is below the loading platform. It is attached to each of the extending support members, and each of the front connecting member and the rear connecting member is rotatable around the shaft member, and is provided in advance for rotation in a direction approaching the loading platform. It is regulated by regulation means.

Moreover, the 2nd invention of this invention is a trolley | bogie as described in Claim 2.
The cart according to claim 2 is the cart according to claim 1, wherein the restriction means is a stopper member provided on the front coupling member or the rear coupling member, and the front coupling member and the rear When the connecting member is viewed from the left-right direction, when the front connecting member or the rear connecting member is rotated in a direction approaching the cargo bed from a U-shaped state, the front connecting member and the rear connecting member are When it becomes substantially straight, the stopper member comes into contact with the rear connecting member or the front connecting member to stop the rotation of the front connecting member or the rear connecting member.

Moreover, the 3rd invention of this invention is a trolley | bogie as described in Claim 3.
The cart according to claim 3 is the cart according to claim 1 or 2, wherein an elastic member is provided between the front connection member and the rear connection member at the rear position of the front connection member. The front connecting member or the rear connecting member has a force in a direction to move away from the cargo bed by the elastic member when the distance to the cargo bed is equal to or less than a predetermined distance for rotation in a direction approaching the cargo bed. Receiving structure.

Moreover, the 4th invention of this invention is a trolley | bogie as described in Claim 4.
The cart according to claim 4 is the cart according to any one of claims 1 to 3, wherein the front connecting member and the rear connecting member are rotated in a direction away from the cargo bed. Collision preventing means is provided to prevent the casters attached to the front connecting member and the casters attached to the rear connecting member from colliding with each other.

According to the cart of claim 1, the fixed caster provided in the front connecting member rotatable around the shaft member extending in the left-right direction and the free connecting member provided in the rear connecting member rotatable around the shaft member. The caster can be configured such that the six wheels are always in contact with the unevenness of the ground contact surface. And at least at the four corners of the loading platform (with the first and third sets of casters), with a simpler structure, the occurrence of meandering is suppressed, and the occurrence of inner ring difference and outer ring difference is also suppressed. Can do.
Further, by including the restricting means, the load from the support member can be received by the front connecting member and the rear connecting member that rotate around the shaft member.

  Moreover, according to the cart of Claim 2, a control means is realizable with a simple structure.

  Further, according to the carriage of the third aspect, since the caster provided in the front connecting member or the rear connecting member can be pressed against the ground surface by the elastic member, the follower of the caster with respect to the ground surface is improved, and the meandering Can be suppressed.

  Moreover, according to the cart of Claim 4, it is convenient when stacking and storing the cart.

The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a plan view (FIG. 1 (A)) and a left side view (FIG. 1 (B)) in an embodiment of a carriage 1 of the present invention.
In all the drawings described below, the X-axis, Y-axis, and Z-axis are orthogonal to each other, the X-axis direction indicates the horizontal traveling direction (forward direction), and the Y-axis direction is the horizontal left direction. Direction, and the Z-axis direction indicates the vertically upward direction.

● [Overall structure of cart 1 (Fig. 1)]
FIGS. 1A and 1B show the types of casters (free casters JC, fixed casters KC) used in the cart 1, the mounting positions of the casters, and the structures at the mounting positions.
The cart 1 includes a cargo bed 10 and three pairs of left and right casters in the front-rear direction.
The first set of casters from the front direction is a free caster JC that can turn in any direction, and is attached to the loading platform 10 via an elastic member B2.
The second set of casters from the front is a fixed caster KC in which the direction of the wheels is fixed in the front-rear direction, and the third set of casters from the front is a free caster JC.
The second set of right fixed casters KC and the third set of right casters JC are attached to a connecting member RB disposed in the front-rear direction. Similarly, the second set of left fixed casters KC and the third set of left casters JC are attached to a connecting member RB arranged in the front-rear direction. Thereby, the cart 1 includes casters at at least four corners of the loading platform 10.

Each of the left and right connecting members RB includes a shaft member J1 having a rotating shaft extending in the left-right direction at a substantially central portion in the front-rear direction, and a front connecting member FR positioned on the front side with respect to the shaft member J1, It is divided into a rear connection member RR located rearward with respect to the shaft member J1 (see FIG. 2A).
A fixed caster KC, which is a second set of casters, is attached to the front of the front connecting member FR, and a universal caster JC, which is a third set of casters, is attached to the rear of the rear connecting member RR. Further, when pulling in the traveling direction, the distance L1 from the shaft member J1 to the rotation axis of the second set of casters (fixed casters KC) and the rotation from the shaft member J1 to the rotation axis of the third set of casters (universal caster JC) The distance L2 is set to be substantially the same.

Each of the left and right shaft members J1 is attached to each of the support members A extending below the loading platform 10.
The front connecting member FR and the rear connecting member RR can rotate around the shaft member J1, but when a load is applied from the cargo bed, both are upward (direction approaching the cargo bed 10) until the support member A hits the ground. It will turn to. Therefore, the front connecting member FR and the rear connecting member RR can be freely rotated with respect to the direction away from the loading platform 10, and the rotation in the direction approaching the loading platform 10 is provided in advance. By the restriction means provided, it can be rotated only to a predetermined position.

● [Structure of connecting member RB (front connecting member FR and rear connecting member RR) and restricting means (FIG. 2)]
Next, the structure of the connecting member RB (the front connecting member FR and the rear connecting member RR) and the restricting means will be described with reference to FIGS. 2A shows a perspective view of the connecting member RB, and FIGS. 2B to 2D show left side views of the connecting member RB. 2A to 2D omit illustrations of the loading platform 10, the support member A, casters, and the like.
As shown in FIG. 2A, a shaft holding member F1 having a through hole F2 through which the holding shaft S1 holding the elastic member B1 is inserted is attached in front of the front connecting member FR (FIG. 3). reference).

Further, a stopper member SU, which is a restricting means for restricting the rotation in the direction approaching the loading platform 10, is attached to the upper side of the front connecting member FR on the rear side of the shaft member J1. Thus, each of the front connecting member FR and the rear connecting member RR can be rotated around the shaft member J1, and the rotation in the direction approaching the loading platform 10 is restricted by the presence of the stopper member SU. ing.
Further, a stopper member SD which is a collision preventing means for restricting the rotation in the direction away from the loading platform 10 is attached to the lower side of the front connecting member FR in front of the shaft member J1. The stopper member SD may be omitted. When the stopper member SD is omitted, each of the front connecting member FR and the rear connecting member RR is free to rotate in a direction away from the loading platform 10. .

2B to 2D are left side views illustrating a state in which the rear connection member RR is rotated around the shaft member J1 in a state where the front connection member FR is held at a fixed position. (C) shows the movable range of rotation of the rear connecting member RR. FIG. 2B shows a limit position of rotation in the direction in which the rear connecting member RR contacts the stopper member SU and approaches the loading platform 10, and FIG. 2D shows the rear connecting member RR as the stopper member. The limit position of the rotation in the direction in contact with SD and away from the loading platform 10 is shown.
In the cart 1 according to the present embodiment shown in FIG. 1 (B), the connecting member RB does not move even if the load from the loading platform 10 is applied to the shaft member J1 and the connecting member RB via the support member A. 2B, the front connecting member FR and the rear connecting member RR are both restricted from rotating in a direction approaching the loading platform 10.

In this way, when the front connecting member FR and the rear connecting member RR are viewed from the left and right directions, the carriage 1 moves in a direction in which the front connecting member FR or the rear connecting member RR approaches the loading platform 10 from the “he” shape. When the front connecting member FR and the rear connecting member RR are substantially linear when rotated, the stopper member SU comes into contact with the rear connecting member RR or the front connecting member FR, and the front connecting member FR or the rear connecting member. It has a structure in which the rotation of RR is stopped.
In addition, when the stopper member SD is lifted, for example, when the carriage 1 is stacked and stored, the fixed caster KC attached to the front connecting member FR and the free caster JC attached to the rear connecting member RR collide. This is a collision preventing means for preventing this.
The example in which the stopper member SU and the stopper member SD are attached to the front connecting member FR has been described above. However, the stopper member SU and the stopper member SD may be attached to either the front connecting member FR or the rear connecting member RR. Good. Further, the stopper member SD may be omitted.

● [Mounting method and operation of elastic member B1 (FIG. 3)]
Next, the method for attaching the elastic member B1 to the connecting member RB and the operation of the attached elastic member B1 will be described with reference to FIGS. 3A to 3C are left side views of the connecting member RB to which the elastic member B1 is attached, and the description of casters and the like is omitted.
For example, the elastic member B1 is a coil spring, the holding shaft S1 is inserted, and one end of the holding shaft S1 is fixed to the loading platform 10 with a nut N1 or the like. The other end of the holding shaft S1 is inserted into a through hole F2 formed in the shaft holding member F1, and a nut N2 or the like having a diameter larger than the diameter of the through hole F2 is fixed to the tip. Yes.
3A to 3C show an example in which the elastic member B1 is provided in front of the front connecting member FR, the elastic member B1 may be provided behind the rear connecting member RR. Moreover, you may provide in both the front of the front connection member FR and the back of the back connection member RR.

  FIG. 3A shows a state in which the fixed caster KC attached to the front connecting member FR and the universal caster JC attached to the rear connecting member RR are in contact with the flat ground (the ground of the same height). Is shown. In this state, the elastic member B1 has a substantially natural length, and neither the force in the compressing direction nor the force in the pulling direction is applied to the loading platform 10 and the front connecting member FR.

FIG. 3B shows a state where the fixed caster KC attached to the front connecting member FR is in contact with the ground contact surface at a higher position than the universal caster JC attached to the rear connecting member RR. In this state, the fixed caster KC attached to the front coupling member FR rotates in a direction approaching the loading platform 10, but the rear coupling member RR is separated from the loading platform 10 because the regulating means (stopper member SU) is provided. Rotate in the direction. Then, a force in the compressing direction is applied to the elastic member B1, and the fixed caster KC attached to the front connecting member FR is urged in a direction to press it against the ground surface. Thereby, the follower | trackability of the caster with respect to a ground surface can improve, and generation | occurrence | production of meandering can be suppressed.
As described above, the front connecting member FR has a structure that receives a force in a direction away from the loading platform 10 by the elastic member B1 when the distance to the loading platform 10 is less than a predetermined distance with respect to the rotation in the direction approaching the loading platform 10. ing.

  FIG. 3C shows a state where the fixed caster KC attached to the front connecting member FR is in contact with the ground contact surface at a position lower than the universal caster JC attached to the rear connecting member RR. In this state, the fixed caster KC attached to the front connecting member FR rotates in a direction away from the loading platform 10 until the stopper member SD comes into contact with the rear connecting member RR and reaches the lower limit position of rotation (FIG. 3). In the example of (C), the nut N2 can be rotated (until it abuts against the shaft holding member F1).

  As described above, the cart 1 according to the present embodiment described with reference to FIGS. 1 to 3 is meandering even if all the casters of the six wheels are always in contact with the unevenness of the ground surface and a plurality of vehicles are connected to the towing vehicle. The generation of the inner wheel difference and the outer wheel difference of each carriage 1 is suppressed even during turning, and very excellent traction characteristics can be realized.

In addition, with respect to the carriage 1 described in the present embodiment shown in FIG. 1, the carriages 201 to 203 shown in FIGS. 4A to 4C are structures of various carriages that the inventors have experimented, 1 to 3, and the carriages 201 to 203 are inferior to the carriage 1.
In the cart 201 shown in FIG. 4A, the universal casters JC are attached to the four corners of the loading platform 10 without using the connecting member RB, and the fixed casters KC are attached to the loading platform 10 at appropriate positions before and after. . Elastic members B <b> 2 to B <b> 4 are provided between the casters and the loading platform 10. In this configuration, meandering is likely to occur.
Moreover, as for the trolley | bogie 202 shown to FIG. 4 (B), the connection member R is not divided | segmented into the front connection member and the back connection member. This configuration also tends to meander.
4C, the connecting member R is divided into a front connecting member FR and a rear connecting member RR, but the stopper members SU and SD are not provided, and the front connecting member FR and Each of the rear connection members RR is provided with an elastic member B5 and an elastic member B6. In this configuration, the spring coefficient of the elastic members B5 and B6 is large for a cart that has a large change in weight between loading and unloading, and a cart that has various loads and a large variation in weight when loading. Adjustment (adjustment of spring coefficient with respect to load) is very difficult.

  The cart 1 of the present invention is not limited to the appearance, configuration, structure, and the like described in the present embodiment, and various modifications, additions, and deletions can be made without changing the gist of the present invention. For example, in the description of the present embodiment, the description of the connecting member between the trucks for connecting to another truck is omitted, but the connecting members between the trucks of various shapes and structures are provided before and after the loading platform 10. Good.

It is the top view and left view explaining the example of the whole structure of the trolley | bogie 1 of this invention. It is a figure explaining structure of connecting member RB (front connecting member FR and back connecting member RR) and a control means. It is a figure explaining the attachment method and operation | movement of elastic member B1. It is a figure explaining the trolley | bogie 201-203 of another structure with respect to the trolley | bogie 1 shown in FIG. It is a figure explaining the example of the conventional trolley | bogie.

Explanation of symbols

1 cart 10 loading platform A support member B1 to B6 elastic member J1 shaft member JC universal caster KC fixed caster RB connection member FR front connection member RR rear connection member S1 holding shaft N1, N2 nut F1 shaft holding member F2 through hole SU, SD stopper Element

Claims (4)

In a truck equipped with a loading platform and three pairs of casters on the left and right in the front-rear direction,
The first and third sets of casters from the front direction are free casters that can turn the direction of the wheel in any direction,
The second set of casters from the front is a fixed caster in which the direction of the wheels is fixed in the front-rear direction.
The first set of casters is attached to a cargo bed,
The second set and the third set of casters are the front and rear of the second set of right casters and the third set of right casters, and the second set of left casters and the third set of left casters. Attached to each of the connecting members arranged in the direction,
Each of the connecting members includes a shaft member having a pivot shaft extending in the left-right direction at a substantially central portion in the front-rear direction of the connecting member, and a front connecting member positioned on the front side with respect to the shaft member; , And a rear connecting member located on the rear side with respect to the shaft member,
The second set of casters is attached to the front of the front connecting member, and the third set of casters is attached to the rear of the rear connecting member,
Each of the shaft members is attached to each of the support members extending below the loading platform,
Each of the front connecting member and the rear connecting member is rotatable around the shaft member, and the rotation in the direction approaching the cargo bed is regulated by a regulating means provided in advance.
Trolley. The cart according to claim 1,
The restricting means is a stopper member provided on the front connecting member or the rear connecting member,
When the front connecting member and the rear connecting member are viewed from the left-right direction, when the front connecting member or the rear connecting member rotates in a direction approaching the cargo bed from a U-shaped state, the front connecting member And when the rear connecting member is substantially linear, the stopper member comes into contact with the rear connecting member or the front connecting member to stop the rotation of the front connecting member or the rear connecting member. Having
Trolley. The carriage according to claim 1 or 2,
An elastic member is provided between the front connection member and the back position of the rear connection member between the cargo bed,
The front connecting member or the rear connecting member has a structure for receiving a force in a direction away from the cargo bed by the elastic member when the distance to the cargo bed is equal to or less than a predetermined distance for rotation in a direction approaching the cargo bed.
Trolley. The carriage according to any one of claims 1 to 3,
When the front connecting member and the rear connecting member rotate in directions away from the loading platform, a caster attached to the front connecting member and a caster attached to the rear connecting member collide with each other. Equipped with anti-collision means to prevent
Trolley.

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