JP5692507B2 - Trolley - Google Patents

Description

  The present invention relates to a carriage having four main traveling wheels provided on the lower surface of the mounting table and auxiliary traveling wheels provided at positions surrounded by the main traveling wheels.

  When changing the direction of travel by turning this during traveling of the carriage, it is desirable that the turning radius be as small as possible. As described above, by reducing the turning radius, that is, improving the turning performance, the carriage can be smoothly driven even on a narrow traveling path. For the purpose of enhancing such turning performance, for example, in the cart described in Patent Document 1, main traveling wheels are provided at the four corners of the lower surface of the mounting table, and auxiliary traveling wheels are provided near the center of the lower surface of the mounting table. Thus, by providing the auxiliary traveling wheels in addition to the main traveling wheels, the mounting table can be easily rotated around the auxiliary traveling wheels, so that the turning performance of the carriage can be improved.

Japanese Patent Laid-Open No. 10-315981

  However, if there is unevenness on the traveling surface of the carriage, the ground contact pressure between the auxiliary traveling wheel and the traveling surface is extremely small, and the effect of improving the turning performance by the auxiliary traveling wheel as described above. May not be obtained sufficiently, and conversely, the auxiliary traveling wheel may contact the traveling surface with an excessive ground pressure and deteriorate the straight traveling performance of the carriage.

  An object of the present invention is to provide a cart capable of maintaining high turning performance without deteriorating straight running performance even when traveling on a traveling surface having unevenness.

  [1] According to one form of the carriage according to the present invention, a mounting table, four main traveling wheels that are arranged on a rectangular shape on the lower surface side of the mounting table and are free-wheeling wheels that support the mounting table; A support portion attached to the mounting table and disposed on a lower surface side of the mounting table; and a wheel mounting table attached to the support portion and rotatable with respect to the support portion around a rotation axis along a vehicle width direction; An auxiliary traveling wheel that is a fixed type wheel that is disposed at a diagonal center of the four main traveling wheels, is attached to the wheel mounting base and is rotatable with respect to the wheel mounting base, and the wheels around the rotation axis An elastic member that generates a reaction force so that the mounting base rotates toward the traveling surface side, and the support member is attached to the support portion, and the position relative to the support portion can be changed. Limit position that can be rotated A and a stopper to decide.
  [2] According to an example of the carriage, the support portion includes a pair of support walls extending downward, and a shaft that is supported by the pair of support walls, has the rotating shaft, and is attached to the wheel mounting base. Prepare.
  [3] According to an example of the carriage, the stopper is attached to the rear surface of the support wall, and the attachment position of the stopper with respect to the support wall can be changed.
  [4] According to one example of the carriage, the carriage further includes a second stopper that determines a limit position where the wheel mounting base can rotate on the lower surface side of the mounting table around the rotation axis, and the second stopper includes It arrange | positions between the pair of support walls, and is attached to the pair of support walls.
  [5] According to an example of the carriage, the support plate is disposed on the lower surface side of the mounting table on the rear side of the support portion and attached to the lower surface of the mounting table, and is supported by the support plate. And an adjustment rod movable relative to the support plate in the front-rear direction of the mounting table, wherein one end of the elastic member is connected to the wheel mounting base, and the other end of the elastic member is the adjustment rod. Connected to
  [6] According to one example of the carriage, the pair of auxiliary traveling wheels arranged in the vehicle width direction, the pair of elastic members attached to the pair of auxiliary traveling wheels, and the connection attached to the adjustment rod A rod is further provided, and the other end of the pair of elastic members is coupled to the coupling rod.
  [7] According to one example of the cart, the front mounting portion is attached to the front portion of the mounting table and connected to another cart, and is attached to the rear portion of the mounting table and connected to another cart. And a rear connecting part.

  According to the cart of [1], the following effects can be obtained.
  According to this cart, the elastic deformation amount of the elastic member changes according to the unevenness of the traveling surface, and the auxiliary traveling wheel easily contacts the traveling surface with appropriate pressure due to the reaction force generated by the elastic member. For this reason, when a trolley | bogie drive | works the driving | running | working surface where an unevenness | corrugation exists, the fall of a straight advance is suppressed and high turning property is easy to be maintained.
  Further, according to the present carriage, by changing the position of the stopper with respect to the support portion, it is possible to change the maximum separation distance that is the distance when the auxiliary traveling wheel is most separated from the mounting table. For this reason, for example, by setting the maximum separation distance short when the traveling surface with small unevenness is made to travel on the carriage, and setting the maximum separation distance long when traveling the traveling surface with large unevenness to the carriage, the wheel mounting base is The range that can be rotated with respect to the mounting table can be changed according to the unevenness of the running surface. For this reason, it is easier to obtain the effect of suppressing a decrease in straightness and maintaining high turning performance.
  According to the cart of [5], the following effects can be obtained.
  The contact pressure between the main traveling wheel and the traveling surface varies depending on the weight of the load placed on the placing table. On the other hand, the contact pressure between the auxiliary traveling wheel and the traveling surface is determined mainly based on the reaction force of the elastic member. On the other hand, when the contact pressure between the auxiliary traveling wheel and the traveling surface is small relative to the contact pressure between the main traveling wheel and the traveling surface due to the large weight of the load, the effect of improving the turning performance by the auxiliary traveling wheel is obtained. May not be obtained. On the other hand, if the contact pressure between the auxiliary traveling wheel and the traveling surface is large relative to the contact pressure between the main traveling wheel and the traveling surface due to the small weight of the load, the straight traveling performance of the carriage may be reduced.
  According to this carriage, by adjusting the magnitude of the reaction force generated by the elastic member, the ground contact pressure between the auxiliary traveling wheel and the traveling surface is appropriately increased according to the weight of the luggage placed on the placing table. Can be adjusted. For this reason, the possibility that the turning performance is lowered due to the large weight of the load is reduced, and the possibility that the straight traveling performance is lowered due to the small weight of the load is reduced.
  According to the cart of [6], the following effects can be obtained.
  According to this cart, the frictional force generated between the traveling surface and the auxiliary traveling wheels is increased as compared with the case where the number of auxiliary traveling wheels is one. For this reason, it is possible to prevent the cart from slipping due to the side force generated when the traveling direction of the cart is changed, and the turning performance of the cart can be further improved.
  According to the cart of [7], the following effects can be obtained.
  According to this bogie, it can be used in connection with one or more other bogies.

  According to one form of the carriage, high turning performance can be maintained without lowering the straight traveling performance even when traveling on a traveling surface having unevenness.

It is a bottom view of the cart of an embodiment. It is a side view of FIG. (A) is a perspective view of the wheel mounting base of FIG. (B) is the lower limit stopper of FIG. It is a perspective view. (A) is sectional drawing which shows the state in which the auxiliary traveling wheel of FIG. 2 was most separated from the mounting base. The (B) is sectional drawing which shows the state in which the auxiliary | assistant driving | running | working wheel of FIG. 2 was closest to the mounting base. It is an enlarged view of the adjustment mechanism of FIG. It is a side view of the back side connection part of FIG. It is a perspective view of the lower limit stopper of a modification.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In each of these drawings, the traveling direction and the vehicle width direction of the carriage are shown as necessary.
First, with reference to FIG.1 and FIG.2, the main structures of a trolley | bogie are demonstrated.

  The carriage is provided near the center of the bottom surface of the mounting table 10, the rectangular mounting table 10 on which the luggage is mounted, the four main traveling wheels 21, 22, 23, 24 provided on the lower surface of the mounting table 10. In addition to the pair of auxiliary traveling wheels 31A and 31B, an urging mechanism 40 that urges the auxiliary traveling wheels 31A and 31B toward the traveling surface is provided. Further, the urging mechanism 40 includes an adjustment mechanism 50 for adjusting the urging force and a support portion 60 that supports the auxiliary traveling wheels 31A and 31B so as to be close to and away from each other.

  The main traveling wheels 21 to 24 are universal wheels that can change the extending direction of the axle, and are fixed to the four corners of the lower surface of the mounting table 10 in a rectangular shape. On the other hand, the auxiliary traveling wheels 31 </ b> A and 31 </ b> B are fixed wheels with the axle extending direction fixed, and are provided on the lower surface of the mounting table 10. Here, these auxiliary traveling wheels 31A and 31B are provided at the diagonal centers of the main traveling wheels 21 to 24. That is, a diagonal line connecting the main traveling wheel 21 disposed in the forward direction of the carriage and leftward in the vehicle width direction and the main traveling wheel 24 disposed in the rearward direction of the carriage and rightward in the vehicle width direction. L1 is connected to a main traveling wheel 22 disposed in front of the carriage in the traveling direction and to the right in the vehicle width direction, and a main traveling wheel 23 disposed in the rear in the traveling direction and to the left in the vehicle width direction. The auxiliary traveling wheels 31A and 31B are disposed in the vicinity of the intersection with the diagonal line L2.

  The support portion 60 of the urging mechanism 40 includes a substrate 61 fixed to the lower surface of the mounting table 10 and a pair of support walls 62A and 62B fixed to the substrate 61. These support walls 62A and 62B extend below the mounting table 10, that is, toward the traveling surface, and are provided at a predetermined interval in the vehicle width direction. Further, insertion holes (not shown) are formed in the support walls 62A and 62B, and a shaft 66 is inserted into the insertion holes, and the shaft 66 is fixed to the support walls 62A and 62B through fastening with a nut 65. . Note that the shaft 66 is fixed to the support walls 62A and 62B in this manner, so that the shaft 66 extends in parallel with the vehicle width direction.

  A wheel mounting base 32 is provided between the support walls 62A and 62B, and auxiliary traveling wheels 31A and 31B are fixed to a lower surface 32A of the wheel mounting base 32. These auxiliary traveling wheels 31A and 31B are adjacent to each other in a state where the respective axles are positioned on a straight line parallel to the vehicle width direction. The wheel mounting base 32 has a rectangular shape, and a pair of collars 67 are fixed to the edge located forward of the traveling direction of the carriage. A shaft 66 is loosely inserted into these collars 67. Thereby, the rear side portion of the wheel mounting base 32 in the traveling direction of the carriage can swing around the shaft 66. That is, the auxiliary traveling wheels 31 </ b> A and 31 </ b> B fixed to the wheel mounting base 32 are supported in such a manner that they can approach and separate from the mounting table 10.

  An upper limit stopper 63 is provided between the support walls 62A and 62B. The upper limit stopper 63 has an L-shaped cross section and extends parallel to the shaft 66, and each end thereof is fixed to the support walls 62A and 62B. The upper limit stopper 63 limits the distance when the ground contact surface with the traveling surface of the auxiliary traveling wheels 31 </ b> A and 31 </ b> B comes closest to the mounting table 10.

  On the other hand, a lower limit stopper 64 is provided on the side surface of the support wall 62A for limiting the distance when the ground contact surface with the traveling surface of the auxiliary traveling wheels 31A and 31B is farthest from the mounting table 10.

  In the following description, the distance when the ground contact surface with the traveling surface of the auxiliary traveling wheels 31A and 31B is closest to the mounting table 10 is the “minimum separation distance”, and the contact with the traveling surface of the auxiliary traveling wheels 31A and 31B. The distance when the ground is farthest from the mounting table 10 is defined as “maximum separation distance”.

  The adjustment mechanism 50 includes a pair of tension springs (hereinafter simply referred to as “springs”) 41 that expand and contract in the traveling direction of the carriage, and an adjustment rod 51 that adjusts the elastic force (tensile force) of these springs 41. . A support plate 52 having an L-shaped cross section is fixed to the lower surface of the mounting table 10. The adjustment rod 51 is inserted into an insertion hole (not shown) formed in the support plate 52 at the rear end in the traveling direction of the carriage, and is attached to the support plate 52 by a pair of nuts 53 so as to sandwich the support plate 52. ing. By being attached to the support plate 52 in this way, the adjustment rod 51 is in a state of extending in the traveling direction of the carriage.

  Further, in the adjustment rod 51, a connecting rod 42B extending in the vehicle width direction is fixed to an end portion in the forward direction of the carriage. End portions of the springs 41 located at the rear of the carriage in the traveling direction are attached to the connecting rod 42B. On the other hand, a connecting rod 42 </ b> A is fixed to the spring mounting plate 33 fixed to the wheel mounting base 32. The end of each spring 41 positioned in the forward direction of the carriage is attached to the connecting rod 42A. For this reason, the wheel mounting base 32 is urged toward the traveling surface by the elastic force of each spring 41. As a result, the auxiliary traveling wheels 31A and 31B are biased toward the traveling surface by the springs 41.

  As shown in FIG. 2, the mounting table 10 is provided with a front connecting part 11 in the front and a rear connecting part 12 in the rear in the traveling direction of the carriage. The rear connecting portion 12 is provided with a receiving portion 12C into which the front end portion of the front connecting portion 11 can be inserted, and a pair of connecting holes 12A into which pins 12B can be inserted. On the other hand, a connecting hole 11A into which the pin 12B can be inserted is formed at the tip of the front connecting portion 11. A handle 70 is provided in front of the mounting table 10 in the traveling direction.

  Next, with reference to FIGS. 3 and 4, the swinging mode of the auxiliary traveling wheels 31 </ b> A and 31 </ b> B will be described. In FIG. 3, illustration of auxiliary traveling wheels 31 </ b> A and 31 </ b> B provided on the wheel mounting base 32 is omitted for convenience of explanation.

  As shown in FIG. 3A, on the side surface of the support wall 62A, there are provided three attachment holes 68A, 68B, 68C formed with screws for fixing the lower limit stopper 64 to the support wall 62A. On the other hand, as shown in FIG. 3B, the lower limit stopper 64 is provided with a protrusion 64A that can come into contact with the wheel mounting base 32 when the wheel mounting base 32 swings.

  When the wheel mount 32 rotates about the shaft 66 to the position shown by the solid line in FIG. 3, the protrusion 64A of the lower limit stopper 64 comes into contact with the lower surface 32A of the wheel mount 32 so that the swinging thereof is restricted. Become. As a result, the auxiliary traveling wheels 31A and 31B are no longer separated from the mounting table 10, and the maximum distance between the auxiliary traveling wheels 31A and 31B is limited as shown in FIG.

  On the other hand, when the wheel mounting base 32 rotates about the shaft 66 to the position of the two-dot chain line in FIG. 3, the upper limit stopper 63 comes into contact with the upper surface 32B of the wheel mounting base 32 and the swinging thereof is restricted. . As a result, the auxiliary traveling wheels 31A, 31B and beyond are no longer close to the mounting table 10, and as shown in FIG. 4B, the minimum distance between the auxiliary traveling wheels 31A, 31B is limited.

  Further, as shown in FIG. 3 (B), the lower limit stopper 64 is attached to the support wall 62A by selectively screwing the lower limit stopper 64 into arbitrary mounting holes 68A to 68C with bolts 69, thereby assisting. It is possible to adjust the maximum separation distance between the traveling wheels 31A and 31B. Specifically, the maximum separation distance between the auxiliary traveling wheels 31A and 31B becomes longer in the order of the mounting holes 68A, 68B and 68C. For this reason, when the carriage travels on a traveling surface with small irregularities, the maximum separation distance is shortened, while when traveling on a traveling surface with large irregularities, the maximum separation distance is increased. It can adjust appropriately with the aspect according to the condition of an unevenness | corrugation.

Next, with reference to FIG. 5, the aspect of adjustment of the elastic force of the spring 41 by the adjustment mechanism 50 will be described. 5 is an enlarged view of the vicinity of the support plate 52 in FIG.
As described above, the adjustment rod 51 is fixed to the support plate 52 by the pair of nuts 53. In the state shown in FIG. 5A, the adjustment rod 51 protrudes from the support plate 52 by a predetermined length (hereinafter referred to as “projection length X”) toward the rear in the traveling direction. Here, the contact pressure between the auxiliary traveling wheels 31A and 31B and the traveling surface can be changed by appropriately changing the protrusion length X. For example, when it is desired to increase the contact pressure between the auxiliary traveling wheels 31 </ b> A and 31 </ b> B and the traveling surface, the nut 53 is loosened, the adjustment rod 51 is pulled backward in the traveling direction, and the adjustment rod 51 is fixed again with the nut 53. That is, the protrusion length X is increased as shown in FIG. As a result, the elastic force of the spring 41 connected to the adjusting rod 51 increases, and as a result, the urging force toward the traveling surfaces of the auxiliary traveling wheels 31A and 31B can be increased.

Next, with reference to FIG. 6, the connection aspect of the front connection part 11 and the back connection part 12 is demonstrated.
As shown in FIG. 6, when connecting both the connecting portions 11 and 12, after inserting the distal end portion of the front connecting portion 11 into the receiving portion 12 </ b> C of the rear connecting portion 12, the pin 12 </ b> B is connected to each of the connecting holes 11 </ b> A and 12 </ b> A. To penetrate. Thereby, the front connection part 11 and the back connection part 12 are connected.

  When the cart is used alone as a hand cart, the handle 70 is gripped and pushed in the direction opposite to the traveling direction in the figure to run. On the other hand, when a plurality of trucks are connected and towed, as described above, the front connecting part 11 and the rear connecting part 12 are connected and pulled by the tow car to travel forward in the traveling direction in the figure.

According to this embodiment described above, the following effects can be obtained.
(1) In the cart described above, the auxiliary traveling wheels 31A and 31B are urged away from the mounting table 10 toward the traveling surface by the elastic force of the spring 41, so that even if the traveling surface is uneven. The amount of elastic deformation of the spring 41 changes according to the unevenness. The auxiliary traveling wheels 31A and 31B can be grounded to the traveling surface with appropriate pressure by the urging force generated thereby. Therefore, even when the carriage travels on a traveling surface having unevenness, high turning performance can be maintained without deteriorating straight traveling performance. Furthermore, the operator can adjust the maximum separation distance between the auxiliary traveling wheels 31A and 31B by selecting the attachment holes 68A to 68C. For this reason, the maximum separation distance is shortened when traveling on a traveling surface with small irregularities, while the maximum separation distance is increased when traveling on a traveling surface with large irregularities. It can be appropriately adjusted depending on the mode. Therefore, the effect of maintaining high turning performance without deteriorating the straight running performance as described above can be made more effective. The main traveling wheels 21 to 24 are all freely adjustable wheels that can change the extending direction of the axle, and the auxiliary traveling wheels 31A and 31B are fixed wheels that are fixed in the vehicle width direction. Therefore, it is possible to further enhance the effect of maintaining high turning performance without reducing straightness.

  (2) Since the auxiliary traveling wheels 31A and 31B are configured by a pair of adjacent fixed wheels in which the axle is positioned on a straight line parallel to the vehicle width direction, compared to a configuration in which only one auxiliary traveling wheel is provided. The frictional force generated between the traveling surface and the auxiliary traveling wheels 31A and 31B can be increased. Therefore, it is possible to suppress a side slip from being generated in the carriage due to the side force generated when the traveling direction of the carriage is changed, and it is possible to further improve the turning performance.

  (3) The main traveling wheels 21 to 24 are disposed in a rectangular shape on the lower surface of the mounting table 10, and the auxiliary traveling wheels 31 </ b> A and 31 </ b> B are disposed on the lower surface of the mounting table 10 at the diagonal center of these main traveling wheels. Has been. For this reason, since the mounting table 10 is easy to turn around the auxiliary traveling wheels 31A and 31B, the turning performance of the carriage can be further improved. Furthermore, since the auxiliary traveling wheels 31A and 31B disposed at the diagonal centers of the main traveling wheels 21 to 24 are biased toward the ground, the carriage turns around the auxiliary traveling wheels 31A and 31B as fulcrums. Therefore, it is possible to suppress an increase in the inner ring difference when the carriage turns. This effect is particularly remarkable when the truck is connected and pulled, as compared with a truck that does not have auxiliary traveling wheels.

(4) The contact pressure between the main traveling wheels 21 to 24 and the traveling surface varies depending on the weight of the load placed on the placing table 10. On the other hand, the ground contact pressure between the auxiliary traveling wheels 31A and 31B and the traveling surface is an urging force when the auxiliary traveling wheels 31A and 31B are urged toward the traveling surface by the urging mechanism 40, in other words, attached. Since it is uniquely determined based on the elastic force of the spring 41 for generating the force, it is constant regardless of the load of the load. Here, when the ground contact pressure between the auxiliary traveling wheels 31A and 31B and the traveling surface is excessively small with respect to the ground contact pressure between the main traveling wheels 21 to 24 and the traveling surface because the weight of the load is large, the above-described case is described. It becomes difficult to maintain high turning performance by the auxiliary traveling wheels 31A and 31B. On the other hand, if the contact pressure between the auxiliary traveling wheels 31A and 31B and the traveling surface becomes excessively large relative to the contact pressure between the main traveling wheels 21 to 24 and the traveling surface because the weight of the load is small, the vehicle goes straight. There is a risk that the traveling of the carriage becomes unstable, such as deterioration of the performance.
In this respect, in the cart according to the present embodiment, by adjusting the elastic force of the spring 41, the auxiliary traveling wheels 31A, 31A, The contact pressure between 31B and the running surface can be adjusted to an appropriate magnitude. Therefore, it is possible to further improve the stability of traveling of the carriage while maintaining high turning performance.

  (5) Since the mounting table 10 is provided with the front connecting portion 11 and the rear connecting portion 12 for connecting other carts to both the front and rear in the traveling direction, it can be used alone as a hand cart. Of course, a cart can also be used in a mode in which a plurality of carts are connected and pulled according to the situation.

(Other embodiments)
In addition, the embodiment of the present invention is not limited to the embodiment exemplified in the above-described embodiment, and the embodiment may be modified as shown below, for example. The following modifications are not applied only to the above-described embodiment, and different modifications can be combined with each other.

  In the above embodiment, the lower limit stopper 64 is attached to the attachment holes 68A to 68C in order to adjust the maximum separation distance between the auxiliary traveling wheels 31A and 31B, but the attachment mode of the lower limit stopper 64 is changed as follows. Can do.

  That is, as shown in FIG. 7, the lower limit stopper 64 may be fixed at a predetermined position of one long hole 83 with the washer 81, the bolt 82, and the nut 84. According to this configuration, the maximum separation distance between the auxiliary traveling wheels 31A and 31B and the mounting table 10 can be adjusted steplessly.

  In the above embodiment, the main traveling wheels 21 to 24 are free-wheeling wheels, but the main traveling wheels 21 and 22 provided in the front in the traveling direction are fixed wheels, and the main traveling wheels provided in the rear in the traveling direction. 23 and 24 can be free wheel. Further, the main traveling wheels 21 and 22 provided in the front in the traveling direction can be free-wheeling wheels, and the main traveling wheels 23 and 24 provided in the rear in the traveling direction can be fixed-type wheels. Also with this configuration, the effects according to the above (1) to (5) can be obtained.

  In the above embodiment, the auxiliary traveling wheels 31A, 31B are a pair of adjacent fixed wheels whose axles are positioned on a straight line parallel to the vehicle width direction. However, the auxiliary traveling wheels are one or more wheels. Can also be configured. Also with this configuration, the effects according to the above (1) to (5) can be obtained.

  In the above embodiment, four main traveling wheels are provided. However, any number of the main traveling wheels may be provided as long as at least four main traveling wheels are provided. Also with this configuration, the effects according to the above (1) to (5) can be obtained.

  In the above embodiment, the auxiliary traveling wheels 31A and 31B are arranged at the diagonal center of the main traveling wheels 21 to 24 arranged in a rectangular shape on the lower surface of the mounting table 10, but the auxiliary traveling wheels 31A and 31B are What is necessary is just to be in the area | region of the main driving | running | working wheels 21-24 arrange | positioned in these rectangular shapes. Also with this configuration, the effects according to the above (1) to (5) can be obtained.

  In the above embodiment, the main traveling wheels 21 to 24 are arranged in a rectangular shape at the four corners of the lower surface of the mounting table 10, but these main traveling wheels may be arranged in other forms such as a trapezoidal shape. . Also with this configuration, the effects according to the above (1) to (5) can be obtained.

  DESCRIPTION OF SYMBOLS 10 ... Mounting stand, 11 ... Front connection part, 11A ... Connection hole, 12 ... Back connection part, 12A ... Connection hole, 12B ... Pin, 12C ... Receiving part, 21 ... Main traveling wheel, 22 ... Main traveling wheel, 23 ... Main traveling wheel, 24 ... main traveling wheel, 31A ... auxiliary traveling wheel, 31B ... auxiliary traveling wheel, 32 ... wheel mounting base, 32A ... lower surface, 32B ... upper surface, 33 ... spring mounting plate, 40 ... biasing mechanism, 41 ... Spring, 42A ... connecting rod, 42B ... connecting rod, 50 ... adjusting mechanism, 51 ... adjusting rod, 52 ... support plate, 60 ... support section, 61 ... substrate, 62A ... support wall, 62B ... support wall, 63 ... upper limit stopper 64 ... Lower limit stopper, 64A ... Stopper body, 64B ... Stopper tip, 65 ... Nut, 66 ... Shaft, 67 ... Collar, 68A ... Mounting hole, 68B ... Mounting hole, 68C ... Mounting hole, 70 ... Handle, 81 ... Washer , 82 ... Belt, 83 ... hole, 84 ... nut.

Claims (7)

  A mounting table;
  Four main traveling wheels that are arranged on a rectangular shape on the lower surface side of the mounting table and are free-wheeling wheels that support the mounting table;
  A support unit attached to the mounting table and disposed on the lower surface side of the mounting table;
  A wheel mounting base attached to the support portion and rotatable relative to the support portion around a rotation axis along a vehicle width direction;
  An auxiliary traveling wheel that is a fixed wheel that is arranged at the diagonal center of the four main traveling wheels, is attached to the wheel mounting base, and is rotatable with respect to the wheel mounting base;
  An elastic member that generates a reaction force so that the wheel mount rotates to the traveling surface side around the rotation axis;
  A stopper which is attached to the support portion and is capable of changing a position relative to the support portion, and determines a limit position where the wheel mounting base can rotate to the traveling surface side around the rotation axis;
  Dolly equipped with.   The support portion includes a pair of support walls extending downward, and a shaft that is supported by the pair of support walls, has the rotating shaft, and is attached to the wheel mounting base.
  The cart according to claim 1.   The stopper is attached to the rear side surface of the support wall, and the attachment position of the stopper with respect to the support wall can be changed.
  The cart according to claim 2.   A second stopper for determining a limit position where the wheel mount can rotate on the lower surface side of the mounting table around the rotation axis;
  The second stopper is disposed between the pair of support walls and attached to the pair of support walls.
  The cart according to claim 2 or 3.   The support plate is arranged on the lower surface side of the mounting table on the rear side of the support portion, and is attached to the lower surface of the mounting table, and is supported by the support plate. And a movable adjustment rod,
  One end of the elastic member is connected to the wheel mount, and the other end of the elastic member is connected to the adjustment rod.
  The trolley | bogie as described in any one of Claims 1-4.   A pair of auxiliary traveling wheels arranged in the vehicle width direction, a pair of elastic members attached to each of the pair of auxiliary traveling wheels, and a connecting rod attached to the adjustment rod;
  The other end of the pair of elastic members is connected to the connecting rod.
  The cart according to claim 5.   A front connecting portion attached to the front portion of the mounting table and connected to another cart, and a rear connecting portion attached to the rear portion of the mounting table and connected to another cart.
  The trolley | bogie as described in any one of Claims 1-6.

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