JP2015199395A - Transportation vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a main body to be smoothly moved down without receiving shock when releasing a mode of parallel movement.SOLUTION: Adjustable wheels 15F and 15R and a fixed wheel 16 are respectively arranged at both front and rear ends of a bottom part 18 of a transportation vehicle main body 10 and between the adjustable wheels. The fixing wheel 16 and the adjustable wheel 15R at either end of the front and rear ends are installed directly on a main body bottom part 18, and on the main body bottom part 18 is also pivotally supported an arm 25 slidably that is extended toward an opposite end part with an end part installed with the adjustable wheel 15R as a base end. The other adjustable wheel 15F is installed on a floating member 30 provided on an extending end of the arm 25. Between the floating member 30 and the main body bottom part 18 is interposed a jack 41 whose rod 44 is extended vertically by stepping force operation of a pedal 48; and between the extending end side of the arm 25 and the main body bottom part 18 is interposed a damper 60 with biasing force in a direction in which the main body bottom part 18 is lifted up.

Description

  The present invention relates to a transport vehicle such as a distribution vehicle.

In the distribution car used for distributing meals at hospitals, etc., both the front and rear ends along the direction of travel are intended to provide excellent stability when moving in a corridor etc. and cornering when turning corners. Generally, a wheel arrangement structure is provided in which a free wheel whose direction is variable around the vertical axis and a fixed wheel whose direction is fixed in the direction along the traveling direction are provided at an intermediate position between the two free wheels.
On the other hand, when handling a layout car, the side with the entrance of the layout car is attached to the wall, or when the layout cars are arranged side by side, the so-called width-shifting is performed. You may want to

Therefore, the applicant of the present application has proposed the technique described in Patent Document 1 below as a means for simplifying the shifting operation. The fixed wheel and either the front or rear universal ring are directly attached to the bottom of the main body, and the bottom of the main body extends to the opposite end side with the end side where the free wheel is attached as the base end. The extended arm is pivotally supported so as to be swingable, and the other universal ring is attached to the floating member provided at the extended end of the arm. Between the floating member and the bottom of the main body, the pedal It has a structure in which a jack is provided in which the rod extends in the vertical direction by a stepping pressure operation.
And when the pedal of the jack is depressed, the rod is extended and pressed against the floating member attached with the free wheel, and since the free wheel is on the running surface, the main body is pushed up while the arm swings, Since the fixed wheel attached to the bottom of the main body is lifted from the running surface, if a pressing force or the like is applied to the transport vehicle in a direction perpendicular to the traveling direction, the front and rear free wheels change direction in the same direction. Can be translated as it is.

Japanese Patent Laid-Open No. 2001-270445

In the above-described conventional device, in order to cancel the parallel movement mode, the rod is contracted by releasing the pressure of the release pedal provided on the jack and the rod is contracted, so that the connection between the bottom of the main body and the levitation member is achieved. Since the paddle disappears, the main body sinks due to its own weight while swinging the arm in the opposite direction to the above, and the main body takes a normal horizontal posture when the fixed wheel hits the running surface. When the main body sinks, the impact force increases especially when the weight of the main body is large, such as a layout car, and therefore further improvement has been desired to alleviate the impact force.
The present invention has been completed based on the above circumstances.

  In the present invention, a universal ring whose direction is variable around the vertical axis is provided at both front and rear ends along the traveling direction at the bottom of the main body of the transport vehicle, and a position between these universal wheels is directed in a direction along the traveling direction. The fixed wheels and either of the front and rear universal wheels are directly attached to the bottom of the main body, and the bottom of the main body is attached to the end of the universal wheel. An arm extending from the base end to the opposite end side is pivotally supported, and the other universal ring is attached to the floating member provided at the extended end of the arm. A jack is interposed between the member and the bottom of the main body so that the rod extends in the vertical direction by a pedaling operation of the pedal, and between the extension end side of the arm and the main body bottom, the main body bottom With a biasing force in the direction of lifting Lymph characterized by where is interposed.

When the pedal of the jack is depressed, the rod extends and is pressed against the levitation member with the free wheel attached. Since this free wheel is on the running surface, the arm is swung up and the main body is pushed up and attached to the bottom of the main body. The fixed wheel lifted from the running surface. Therefore, if a pressing force or the like is applied to the transport vehicle in a direction perpendicular to the traveling direction, the transport vehicle can be translated as it is while the front and rear free wheels change direction.
When releasing the above-mentioned parallel movement mode, when the jack rod is contracted, there is no connection between the bottom of the main body and the levitation member, so the main body until the fixed wheel hits the running surface and takes a horizontal posture. However, since the levitation member is provided with a damper, the main body is prevented from slowly sinking and receiving an impact against the urging force provided to the damper.

The following configuration may also be used.
(1) The damper includes a cylinder filled with a working liquid, a piston slidably fitted in the cylinder and having a piston rod projecting on the front surface, and the piston in a direction in which the piston rod projects. A liquid damper comprising: a spring member that moves and energizes; and a valve mechanism that can switch a size of the flow path provided in the piston when the piston moves forward and when the piston moves backward. is there.
When the main body sinks, the load is received by the liquid damper, and the main body sinks slowly while the piston rod moves backward at a low speed by the function of the liquid damper. That is, the main body can be lowered smoothly without receiving an impact.
On the other hand, since the piston rod of the liquid damper has a high speed characteristic when it is extended, when the main body is lifted by depressing the pedal of the jack, the extension force of the piston rod can be used as an assisting force for lifting. The pressure can be kept smaller.

(2) The liquid damper is attached to the levitation member in a form in which the tip of the piston rod faces the bottom of the main body so as to be able to come into contact therewith.
(3) The liquid damper is attached to the bottom of the main body in a form in which the tip end of the piston rod faces the extended end side of the arm so as to be able to come into contact therewith.

  According to the present invention, the main body can be smoothly lowered without receiving an impact when releasing the parallel movement mode.

1 is a side view of a distribution vehicle according to Embodiment 1 of the present invention. Perspective view showing the bottom structure of the main body Perspective view of the bottom plate before the arm unit is attached Perspective view of arm unit Jack's perspective view Partial cutaway side view before rod extension Partial cutaway side view after rod extension Partially cutout schematic front view of liquid damper Side view of the bottom of the main unit with the main unit lifted Side view of the bottom of the main unit with the main unit returned to its original position The side view of the main-body bottom part of the state by which the main body which concerns on Embodiment 2 was lifted Side view of the bottom of the main unit with the main unit returned to its original position

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, an arrangement vehicle is illustrated.
Referring to FIG. 1, the overall structure of the arrangement vehicle is provided with a storage chamber body 10 (hereinafter simply referred to as a main body 10) composed of a rectangular heat-insulating box whose both front and back surfaces are open. As will be described later, wheels 15 and 16 for movement are provided at the bottom.
Inside the main body 10, a warm room 12 and a cold room 13 are formed on both the left and right sides of the heat insulating partition wall 11, and two sets of left and right are formed, and the hot food and the cold food are placed separately. A tray 14 that can be used is capable of being accommodated across both the chambers 12 and 13 while penetrating the partition wall 11. This wheelchair is basically moved along the length direction by being pulled or pushed by a handle provided on one side surface of the main body 10 in the length direction (left-right direction in FIG. 1). It has become so. In the following description, an end side (left side in FIGS. 1 and 2) where jacks 41 and 41A to be described later are disposed will be described as a front end side.

Then, the structure of the bottom part of the main body 10 is demonstrated. As shown in FIG. 2, a pair of left and right universal wheels 15 </ b> F and 15 </ b> R are provided at the front and rear ends, and a pair of left and right fixed wheels 16 are provided at an intermediate position on the bottom of the main body 10.
Specifically, as shown in FIG. 3, bearing brackets 19 are attached to the left and right edges of the intermediate position in the front-rear direction of the bottom plate 18 of the main body 10, and the fixed ring 16 is supported by the shaft 20 in each bearing bracket 19. ing. Both the fixed wheels 16 are rotatable about the shaft 20, while the direction is fixed in the direction along the traveling direction.

  A mounting bracket 22 is provided across the width direction on the rear end side (the right side in FIG. 2) of the bottom plate 18, and a pair of rear universal wheels 15 </ b> R are attached to the left and right ends of the mounting bracket 22. Each of the rear universal wheels 15R is rotatably supported by the shaft 24 with respect to the movable bearing body 23 that can rotate about the longitudinal axis 23A, and the position where the rear universal wheel 15R is in contact with the traveling surface X of the rear universal wheel 15R is the movable bearing body 23. It is eccentric from the vertical axis 23A, and the rear universal wheel 15R can change its direction as the movable bearing body 23 rotates about the vertical axis 23A.

As shown also in FIG. 4, an arm 25 is provided to extend to the front end side of the bottom plate 18 from an intermediate position in the length direction of the mounting bracket 22 to which the pair of rear universal wheels 15R are attached. The arm 25 has a channel shape, and a base end thereof is swingably supported by a shaft 27 passed between a pair of left and right bearing bodies 26 provided on the mounting bracket 22.
A floating member 30 is fixed to the extension end side of the arm 25. The levitation member 30 is formed in a shallow dish shape having a square shape slightly narrower than the bottom plate 18 of the main body 10. A pair of front universal wheels 15F are attached to the left and right ends of the lower surface of the levitation member 30 as with the rear side. The front universal wheel 15F is also rotatably supported by the shaft 24 with respect to the movable bearing body 23 rotatable about the longitudinal axis 23A, and the position where the front universal wheel 15F is in contact with the traveling surface X of the front universal wheel 15F is the movable bearing body 23. It is decentered from the vertical axis 23A, and changes its direction as the movable bearing body 23 rotates about the vertical axis 23A.

The front end of the bottom plate 18 of the main body 10 is opposed to the upper surface of the levitation member 30 described above, and in the state where the front universal wheel 15F is in contact with the running surface X as shown in FIG. Since the front end portion of the bottom plate 18 of the main body 10 is received by the upper surface of the levitation member 30, the main body 10 can take a horizontal posture with respect to the running surface X.
As shown in FIG. 3, two insertion rods 33 are vertically arranged on both the left and right ends of the front end side of the bottom plate 18 of the main body 10 and correspond to the front end side of the levitation member 30. A long hole 35 through which the insertion rod 33 is inserted is opened at a position where the insertion rod 33 is inserted.
A spring seat 37 is provided around each insertion rod 33 on the lower surface of the bottom plate 18 of the main body 10, a compression coil spring 38 is fitted around the insertion rod 33, and an upper end side thereof is fitted outside the spring seat 37. At the same time, the lower end is applied to the bottom surface of the levitation member 30, and the urging force in the direction in which the bottom plate 18 and the levitation member 30 are separated is applied by the spring force.

  As shown in FIG. 4, a window hole 28 is opened at a position near the right side of the levitation member 30 as viewed from the front, and a receiving member 29 is attached to the lower surface side of the window hole 28. The receiving member 29 is formed in a box shape having an opening 29A on the front surface. On the other hand, as shown in FIG. 3, a first jack 41 for floating is attached to a position corresponding to the upper side of the window hole 28 in the bottom plate 18 of the main body 10, and the lower end side of the first jack 41 is connected to the window hole 28. Is inserted into the receiving member 29.

The structure of the first jack 41 will be described with reference to FIGS. A rod 44 provided with a pressing plate 45 at its tip is fitted in a lower end portion of the cylindrical main body 42 provided with a mounting plate 43 on the upper surface so that the rod 44 can be moved back and forth. The moving force in the direction is urged, and the support shaft 46 penetrating the rod 44 hits the lower edge of the cylindrical main body 42 to stop the retreat.
The first jack 41 is provided with a pedal pressure pedal 48 and a release pedal 54. The stepping pedal 48 is formed in a square shape, and its bent portion is rotatably supported by the support shaft 46. A step pressure portion 49 is provided on one end side of the step pressure pedal 48, and the other end and the mounting plate 43 are connected via a link mechanism 50 including a crank / slide mechanism. When the rod 44 is in the retracted position, as shown in FIG. 6, the treading pressure portion 49 takes an obliquely upward position, and the link mechanism 50 moves the connecting portion (the position of the pin 52) backward (right side in FIG. 6). It is set to take the posture of the shape you want to project.

  The release pedal 54 is formed in a square shape that is slightly smaller than the stepping pressure pedal 48, and is generally disposed inside the stepping pressure pedal 48. A bent portion of the release pedal 54 is loosely fitted to the above-described support shaft 46 and is rotatably supported. A treading pressure portion 56 is provided on one end side, and a fulcrum pin 57 is provided on the other end side. ing. Further, a connecting pin 58 is provided at a position slightly closer to the other end side than the shaft support position of the pedal pressure pedal 48 described above, and this connection pin 58 is slightly on the other end side from the shaft support position of the release pedal 54. It penetrates the close position with a clearance. When the rod 44 is in the retracted position, as shown in FIG. 6, the both ends of the release pedal 54 are inclined obliquely upward so as to substantially overlap the stepping pressure pedal 48.

The first jack 41 is used with the mounting plate 43 at the upper end fixed, and when the stepping portion 49 of the stepping pedal 48 is depressed from the state in which the rod 44 in FIG. The rod 44 pivots downward as the pivot 46 descends while the other end of the stepping pedal 48 pivots counterclockwise around the pivot 46 as a center. Advance.
When the other end of the stepping pedal 48 and the link 51 are beyond the thought point where they are aligned in a straight line, and the stepping pedal 48 is further pressed down to the position shown in FIG. The spring force that bends in the opposite direction and urges the rod 44 to retreat acts to further bend the connecting portion while rotating the stepping pressure pedal 48 counterclockwise. When the stopper plate 59 provided on the connection end side with the 48 comes into contact with the peripheral surface of the cylindrical main body 42, further rotation of the stepping pedal 48 is restricted, and the stepping pedal 48 is brought into the depressed position shown in FIG. The rod 44 is also locked in the forward position.
The release pedal 54 is slightly rotated counterclockwise, and the fulcrum pin 57 is in contact with the peripheral surface of the cylindrical main body 42. The stepping pressure portion 49 protrudes upward from one end side of the stepping pressure pedal 48 of the stepping pressure pedal 48.

On the other hand, when the stepping pressure portion 56 of the release pedal 54 is depressed from the state shown in FIG. 7, the release pedal 54 rotates in the counterclockwise direction of the drawing around the fulcrum pin 57 that is in contact with the cylindrical main body 42. Accordingly, the pedal pressure pedal 48 is rotated in the clockwise direction via the connecting pin 58. As a result, the other end of the pedal pressure pedal 48 and the link 51 cross the thought point from the opposite direction, and the lock at the depression position of the pedal pressure pedal 48 and the lock at the forward position of the rod 44 are released.
Then, the link 44 is rotated counterclockwise about the pin 53 and the pedal pressure pedal 48 is rotated clockwise about the support shaft 46 by the spring force for backward biasing of the rod 44, and the rod 44. Retreats upward, and the support shaft 46 stops at the original position when it hits the lower edge of the cylindrical main body 42.

  In order to attach the first jack 41 as described above, a mounting portion 39 protrudes from the bottom surface of the bottom plate 18 of the main body 10 of the distribution vehicle as shown in FIG. A mounting plate 43 of the jack 41 is mounted in a suspended state and faces the receiving member 29 from the window hole 28 of the levitation member 30. The pressing plate 45 at the lower end of the rod 44 faces just above the bottom plate of the receiving member 29, and the treading pressure portions 49, 56 of both pedals 48, 54 protrude forward through the opening 29A.

As shown in FIG. 2, a second jack 41 </ b> A for stopping the main body 10 is attached to the side of the attachment position of the receiving member 29 on the lower surface of the levitation member 30. The second jack 41A has the same structure as the first jack 41 for levitation described above.
For attachment of the second jack 41A, as shown in FIG. 4, an attachment portion 39A is provided on the lower surface of the floating member 30 so as to protrude downward, and the attachment plate 43 of the second jack 41A is provided on the attachment portion 39A. Is mounted in a suspended state. When the rod 44 is in the retracted position, the pressing plate 45 at the lower end is lifted from the traveling surface X, and when the rod 44 is extended to the advanced position, the pressing plate 45 is pressed against the traveling surface X.

  In the present embodiment, as will be described in detail later, after the main body 10 is lifted by the first jack 41, means intended to alleviate the impact force when returning to the original horizontal posture is taken. Therefore, as shown in FIGS. 4 and 9, a liquid damper 60 that functions as a pair of left and right speed controllers is provided at a position near the rear end of the above-described levitation member 30.

  As schematically shown in FIG. 8, the liquid damper 60 includes a cylinder 62 in which a working liquid 61 such as silicone oil is sealed, and a slidably fitted inside the cylinder 62, and a piston rod 64 projecting from the front surface. The piston 63, the return spring 65 that moves and urges the piston 63 in the direction in which the piston rod 64 extends, and the flow provided in the piston 63 when moving forward and when moving backward. A valve mechanism 67 capable of switching the size of the channel 66 is provided.

In this liquid damper 60, when the piston rod 64 contracts, it is necessary to resist the urging force of the return spring 65 and to allow the working liquid 61 to pass through the narrow flow passage 66. When the piston rod 64 is extended, the piston rod 64 is biased by the return spring 65, and the working liquid 61 has only to pass through the wide flow passage 66, so that the speed is high.
In addition, the advance / retreat speed of the piston rod 64 can be adjusted by changing the spring force of the return spring 65 with the adjusting portion 68 provided at the rear end of the cylinder 62.

The liquid damper 60 described above is mounted in an upward posture at both left and right end portions on the rear end side of the levitation member 30, and the tip of the piston rod 64 can come into contact with the left and right side edges of the bottom plate 18 of the main body 10. It comes to oppose.
Specifically, as shown in FIG. 9, the liquid damper 60 passes through the mounting hole opened in the bottom plate 30 </ b> A of the levitation member 30, and the bottom plate 30 </ b> A is secured by the upper and lower nuts 69 screwed to the outer periphery of the cylinder 62. By being pinched and tightened, the height can be adjusted.
As shown in FIG. 10, when the main body 10 takes a horizontal posture, the piston rod 64 is mounted at a height position so as to be pushed to the rear end position under the load of the main body 10. Further, as shown in FIG. 9, when the front end of the main body 10 is lifted to the maximum, the forward position of the piston rod 64 comes into contact with the bottom plate 18 of the main body 10 or stays slightly in front. It is desirable to set such a position.

This embodiment has the structure as described above, and the operation thereof will be described subsequently.
In a state where both the jacks 41 and 41A are unlocked, as shown in FIG. 10, the front and rear free wheels 15F and 15R and the fixed wheel 16 therebetween are on the running surface X. By pulling or pushing the handle provided on the front end surface, the trolley can be driven straight and stably, and when turning corners, the free wheels 15F and 15R change smoothly while turning. In the case where the front and back (left and right) surfaces provided with the entrance / exit 10A of the distribution vehicle are reversed, the center of the main body 10 can be rotated as an axis.

On the other hand, when attaching the front and back surfaces provided with the entrance / exit 10A of the arrangement car to the wall or arranging the arrangement cars side by side, the arrangement car is translated in a direction perpendicular to the traveling direction, so-called width adjustment. As follows.
When the stepping pressure pedal 48 of the first jack 41 for levitation is stepped on as shown in FIG. 9, the rod 44 extends and the pressing plate 45 at the lower end thereof is pressed against the bottom surface of the receiving member 29 provided on the levitation member 30. . Here, since the front universal wheel 15F is placed on the running surface X, the levitation member 30 cannot be lowered, so that an upward force acts on the bottom plate 18 of the main body 10 with the extension of the rod 44, and the arm 25 is moved. The front end side of the main body 10 is lifted while relatively swinging around the shaft 27.
When the stepping pressure pedal 48 is depressed to a predetermined position, the rod 44 is locked in the extended state. Further, since the lifting of the main body 10 is assisted by the elasticity of the compression coil spring 38 interposed between the bottom plate 18 of the main body 10 and the levitation member 30, the stepping pressure of the stepping pressure pedal 48 in the first jack 41 is compared. Small enough.

As the front end side of the main body 10 is lifted, the piston rod 64 of the liquid damper 60 is quickly extended by removing the load. When the front end portion of the main body 10 is lifted to the maximum, the piston rod 64 is moved to the forward position. It has advanced and its tip abuts against the bottom plate 18 of the main body 10 or stays slightly in front.
When the front end side of the main body 10 is lifted, the fixed wheel 16 is lifted from the traveling surface X while the front and rear universal wheels 15F and 15R are in contact with the traveling surface X. Therefore, when the main body 10 is pressed from the side orthogonal to the length direction, the front and rear free wheels 15F and 15R change the direction around the vertical axis 23A in the same direction, and the laying wheel is translated as it is.

To release the parallel movement mode, when the release pedal 54 of the first jack 41 is depressed, the lock is released and the rod 44 contracts. As a result, there is no contact between the bottom plate 18 of the main body 10 and the levitation member 30 due to the rod 44 of the first jack 41, so that the front end side of the main body 10 is moved while the arm 25 is swung in the opposite direction. The body 10 sinks due to its own weight, and the fixed wheel 16 hits the running surface X, so that the main body 10 takes a normal horizontal posture.
When the main body 10 sinks, the load of the main body 10 is received by the liquid damper 60 provided on the levitation member 30, and the piston rod 64 is retracted at a low speed by the function of the liquid damper 60, while the front end side of the main body 10 is moved. The vehicle height slowly falls and finally takes a horizontal posture. During this time, the compression coil spring 38 also functions as a buffer material, and the main body 10 is smoothly lowered without receiving an impact.

Regardless of whether or not the main body 10 is floating, when the stepping pressure pedal 48 of the second jack 41A for stopping is depressed, the rod 44 extends and the lower end pressing plate 45 is pressed against the running surface X. Since the levitation member 30 and the running surface X can be connected to each other, the arrangement vehicle can be held in a stopped state.
When the release pedal 54 of the second jack 41A is depressed, the lock is released, the rod 44 contracts, the pressing plate 45 escapes above the running surface X, and there is no stickiness, so the stopped state is released.

According to this embodiment, the following effects can be obtained.
When releasing the parallel movement mode, when the release pedal 54 of the first jack 41 is depressed, the rod 44 contracts to eliminate the connection between the bottom plate 18 of the main body 10 and the levitation member 30. The front end side of the main body 10 sinks by its own weight until the wheel 16 hits the running surface X and takes a horizontal posture. However, since the liquid damper 60 is provided in the levitation member 30, the load is reduced when the main body 10 sinks. The piston rod 64 is retracted at a low speed by the function of the liquid damper 60 and the vehicle height on the front end side of the main body 10 is slowly lowered and finally becomes a horizontal posture. That is, the main body 10 can be smoothly lowered without receiving an impact.
Therefore, it is prevented that the soup in the tableware accommodated in the main body 10 is spilled. In addition, the thought that the operator's foot that has thrust onto the release pedal 54 of the first jack 41 may be pinched between the bottom plate 18 of the main body 10 by slowly lowering the main body 10. Is done.

Further, since the piston rod 64 of the liquid damper 60 has a high speed characteristic when the piston rod 64 is extended, when the main body 10 is lifted by depressing the stepping pedal 48 of the first jack 41, the extension force of the piston rod 64 is increased. This can be used as an assisting force, and the stepping pressure of the first jack 41 can be further reduced.
Since the adjustment portion 68 of the liquid damper 60 is attached so as to protrude into the space on the lower surface side of the levitation member 30, the operation of adjusting the forward / backward speed of the piston rod 64 can be easily performed.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the arrangement position of the liquid damper 60 is changed.
In the present embodiment, one liquid damper 60 faces downward via the bracket 70 at a position slightly behind the position where the floating member 30 is disposed on the bottom plate 18 of the main body 10 and at a position corresponding to the position directly above the arm 25. It is attached with the posture. The distal end of the piston rod 64 is opposed to the bottom plate 25A on the extending end side of the arm 25 so as to be able to come into contact therewith.

  More specifically, as shown in FIG. 12, when the main body 10 takes a horizontal posture, the piston rod 64 is attached to a height position that receives a load from the arm 25 side and is pushed to the rear end position. Yes. Further, as shown in FIG. 11, when the front end portion of the main body 10 is lifted to the maximum, the forward position of the piston rod 64 is brought into contact with the bottom plate 25A of the arm 25 or stays slightly ahead. It is desirable to set it at such a position.

For the parallel movement mode, when the stepping pressure pedal 48 of the first jack 41 for levitation is depressed as shown in FIG. 11, an upward force is similarly applied to the bottom plate 18 of the main body 10 as the rod 44 extends. Then, the front end side of the main body 10 is lifted while relatively swinging the arm 25 around the shaft 27. When the pedal 44 is depressed to a predetermined position, the rod 44 is locked in the extended state, and the main body 10 is held in an oblique posture in which the fixed wheel 16 is lifted from the running surface X.
As the front end side of the main body 10 is lifted, the piston rod 64 of the liquid damper 60 is quickly extended by removing the load. When the front end portion of the main body 10 is lifted to the maximum, the piston rod 64 is moved to the forward position. The tip is advanced and the tip of the arm 25 comes into contact with the bottom plate 25A of the arm 25 or stays slightly in front.

To release the parallel movement mode, when the release pedal 54 of the first jack 41 is depressed, the lock is released and the rod 44 contracts. As a result, there is no contact between the bottom plate 18 of the main body 10 and the levitation member 30 due to the rod 44 of the first jack 41, so that the front end side of the main body 10 is moved while the arm 25 is swung in the opposite direction. The body 10 sinks due to its own weight, and the fixed wheel 16 hits the running surface X, so that the main body 10 takes a normal horizontal posture.
When the main body 10 sinks, the load of the main body 10 is received by the liquid damper 60 suspended from the bottom plate 18 of the main body 10, and the piston rod 64 is retracted at a low speed by the function of the liquid damper 60, and the front end of the main body 10. The vehicle height on the side slowly decreases, and finally it becomes a horizontal posture.

Similar to the first embodiment, the main body 10 can be smoothly lowered without receiving an impact.
Further, the extension force of the piston rod 64 of the liquid damper 60 can be used as an assisting force when the pedal 10 of the first jack 41 is depressed to lift the main body 10.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first embodiment, the location where the liquid damper is attached upward is not limited to the levitation member, but may be the extended end of the arm.
(2) When the liquid damper is attached downward to the bottom of the main body in the second embodiment, the liquid damper may be provided at a position near the front end of the main body bottom so that the piston rod faces the levitation member. May be provided at both left and right ends. The further away the liquid damper is from the fulcrum of the arm, the more efficiently the damper function can be exerted. If two liquid dampers are arranged, the main body can be received more stably.
(3) In the above embodiment, the liquid damper is exemplified as the damper, but other types of dampers such as a pneumatic damper may be applied.
(4) The present invention can be widely applied not only to a trolley car but also to a general transport vehicle including moving wheels.

  DESCRIPTION OF SYMBOLS 10 ... Storage-chamber main body (transport vehicle main body) 15F, 15R ... Swivel wheel 16 ... Fixed wheel 18 ... Bottom plate (bottom part of main body) 25 ... Arm 25A ... Bottom plate of (arm 25) 27 ... Shaft 30 ... Lifting member 30A ... (Floating) The bottom plate 41 of the working member 41 ... the first jack 44 ... the rod 48 ... the pedal pressure pedal 50 ... the link mechanism 54 ... the release pedal 60 ... the liquid damper (damper) 61 ... the working fluid 62 ... the cylinder 63 ... the piston 64 ... the piston rod 65 ... the return Spring (spring member) 66 ... flow passage 67 ... valve mechanism 68 ... adjusting part 69 ... nut 70 ... bracket X ... running surface

Claims (4)

The free wheel whose direction is variable around the vertical axis is fixed to the front and rear ends along the traveling direction at the bottom of the transport vehicle body, and the direction is fixed in the direction along the traveling direction at a position between these two free wheels. Each fixed ring is arranged,
The fixed wheel and either the front or rear universal wheel are directly attached to the bottom of the main body, and the bottom of the main body extends to the opposite end side with the end side to which the universal wheel is attached as a base end. The extended arm is pivotally supported so that it can swing, and the other universal ring is attached to the levitation member provided at the extended end of this arm,
Between the levitation member and the bottom of the main body, a jack is interposed in which the rod extends in the vertical direction by depressing the pedal.
A damper having an urging force in a direction to lift the main body bottom portion is interposed between the extending end side of the arm and the main body bottom portion. The damper includes a cylinder filled with a working liquid, a piston slidably fitted in the cylinder and having a piston rod projecting on the front surface, and a biasing movement of the piston in a direction in which the piston rod projects. And a valve mechanism capable of switching the area of the flow passage provided in the piston when the piston moves forward and when the piston moves backward. The transport vehicle according to claim 1, wherein 3. The transport vehicle according to claim 2, wherein the liquid damper is attached to the levitation member in a form in which a tip end of the piston rod faces the bottom of the main body so as to come into contact therewith. 3. The transport vehicle according to claim 2, wherein the liquid damper is attached to the bottom of the main body in a form in which a tip end of the piston rod is opposed to an extension end side of the arm so as to come into contact therewith.

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