JP2001260888A - Dolly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dolly easy to pull up and sure to stop. SOLUTION: On a mounting bracket 22 of a rear free wheel 15R, an arm 25 extended to a front end is oscillatingly supported at its base end by a shaft 27. A floating member 30 is provided at the extended end thereof on which a front free wheel 15F is mounted. A first jack 41 is mounted between the floating member 30 and a bottom plate 18, with its rod elongated up and down by footing a pedal 48. A second stopping jack 41A having the same structure as the first jack 41 is provided adjacent to the first jack 41 on the lower face of the floating member 30. When the pedal 48 of the first jack 41 is footed, a body is pushed up at its front end while the arm 25 is oscillated, causing a fixed wheel 16 to be floated from a travel plane and a meal service vehicle to be moved in parallel. When the foot pedal 48 of the second jack 41A is footed, the rod is elongated to cause a prop to be formed between the floating member 30 and the travel plane and the meal service vehicle to be held in a stopped condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier such as a catering truck.

[0002]

2. Description of the Related Art Conventionally, as a wheel arranging structure of a serving truck used for serving meals in a hospital or the like, a free wheel whose direction is variable around a vertical axis is provided at both front and rear ends along a traveling direction. In general, a structure is provided in which a fixed wheel whose direction is fixed in the direction along the traveling direction is provided at an intermediate position of the fixed wheel.
Such a wheel arrangement structure is excellent in that it is excellent in stability when the catering car moves linearly in a corridor or the like, cornering property when turning a corner, and enables rotational movement around the center of the body. It has a reputation.

[0003]

On the other hand, when handling the serving trucks, the serving trucks are perpendicular to the traveling direction, such as when attaching the side of the serving truck with an entrance to a wall or arranging the serving trucks side by side. There is a case where the user wants to translate in the direction, that is, to perform so-called width adjustment. However, the conventional one has a fixed wheel whose direction is fixed in the direction along the traveling direction, so that parallel movement cannot be performed suddenly, and particularly in narrow places, it is necessary to perform width adjustment while repeatedly turning over. There was a problem that it was troublesome. SUMMARY OF THE INVENTION The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a transport vehicle that can easily perform a side-to-side operation and reliably perform a stop operation.

[0004]

As means for achieving the above-mentioned object, the invention according to claim 1 is characterized in that a direction around a vertical axis is variable at both front and rear ends along the traveling direction at the bottom of the carrier body. In a transport vehicle, in which a fixed wheel is arranged at a position between these two free wheels in a direction along a traveling direction, the fixed wheel and one of the front and rear free wheels are provided. Is attached directly to the bottom of the main body, and a base end of an arm extending to the end side opposite to the side to which the free wheel is mounted is pivotally supported on the bottom of the main body so that the arm can swing. The other free wheel is attached to a levitation member provided at the extension end of the fin. When a jack is interposed Moni, characterized by the lower surface of the floating member, also where the rod by treading operation pedal is further jack for stopping is provided extending in the vertical direction. The invention according to claim 2 is characterized in that, in the invention described in claim 1, the stepping portions of the pedals of the two jacks are aligned with a predetermined edge of the bottom of the main body.

[0005]

When the pedal of the jack for lifting is depressed, the rod is extended and pressed against the floating member to which the free wheel is attached, and the free wheel rests on the running surface. Therefore, the main body is pushed up while the arm swings, and the fixed wheel attached to the bottom of the main body rises from the running surface. For this reason, 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 are turned in the same direction. On the other hand, when you depress the pedal of the jack for stopping,
The rod is extended to engage the levitation member and the running surface, and the transport vehicle is held at rest. In both the normal moving state and the parallel moving state, the floating member has a free wheel provided thereon mounted on the running surface and is always at a fixed position from the running surface. Since the jack is provided, the stopping jack can be reliably used and held in the stopped state regardless of the normal moving state or the parallel moving state. <Invention of claim 2> Both the lifting and stopping jacks can be depressed at predetermined positions on the main body, and can be operated efficiently.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a serving car will be described below with reference to FIGS. First, the overall structure of the serving car will be described. As shown in FIG.
A storage room main body 10 (hereinafter, simply referred to as a main body) composed of a rectangular heat-insulating box body with both front and back surfaces opened is provided. Wheels 15 and 16 for movement are provided at the bottom of the main body 10 as described later in detail. Is equipped. In the main body 10, a warming room 12 and a cold room 13 are formed on both left and right sides of the heat-insulating partition wall 11, and two sets of left and right rooms are formed, and hot and cold foods are separately placed. Possible tray 14
However, it can be accommodated in both chambers 12 and 13 while penetrating the partition wall 11. This serving car is basically pulled or pushed by a handle provided on one side surface in the length direction of the main body 10 (the left-right direction in FIG. 1),
It is adapted to be moved along the length direction. In the following description, the end side (left side in FIGS. 1 and 2) where the jacks 41, 41A described later are disposed will be described in detail as the front end side.

[0007] Next, the structure of the bottom side of the main body 10 will be described. As shown in FIG. 2, a pair of left and right free wheels 15F and 15R are provided at the front and rear ends of the main body 10, and a pair of right and left fixed wheels 16 are provided at an intermediate position therebetween. Specifically, as shown in FIG. 3, a rectangular tubular bearing bracket 19 having a rectangular cross section elongated in the front-rear direction is attached to the left and right side edges of the bottom plate 18 of the main body 10 at the intermediate position in the front-rear direction. In each of the bearing brackets 19, a fixed wheel 16 is supported on a shaft 20 extending between left and right side plates. The two fixed wheels 16 are rotatable about the shaft 20, while being fixed in a direction along the traveling direction.

At the rear end side of the bottom plate 18 (right side in FIG. 2), a mounting bracket 22 is provided across the width direction.
At the left and right ends of the mounting bracket 22, the rear free wheel 15
R is attached. The rear free wheel 15R is connected to a movable bearing 23 rotatable about a longitudinal axis 23A by a shaft 24.
Is rotatably supported, and the position in contact with the running surface X of the rear free wheel 15R is eccentric from the longitudinal axis 23A of the movable bearing body 23, and the movable bearing body 23 rotates around the longitudinal axis 23A. The rear free wheel 15R can change its direction.

As shown in FIG. 4, an arm 25 is provided extending from the intermediate position in the longitudinal direction of the mounting bracket 22 to which the rear free wheel 15R is mounted, toward the front end of the bottom plate 18. The mounting bracket 22 is provided with a pair of left and right bearings 26, and the base end of the arm 25 is swingably supported by a shaft 27 extending between the two bearings 26. At the extension end side of the arm 25, a floating member 30
Is fixed. As shown in FIG. 5, the floating member 30 is formed in a shallow dish shape as a whole, and has a width slightly smaller than the width of the bottom plate 18 of the main body 10. A pair of front free wheels 15F are attached to the left and right ends of the lower surface of the floating member 30, similarly to the rear side. This front free wheel 15F is also rotatably supported by a shaft 24 with respect to a movable bearing body 23 rotatable about a longitudinal axis 23A, and the position of contact with the running surface X of the front free wheel 15F is determined by the position of the movable bearing body 23. It is eccentric from the longitudinal axis 23A, and changes its direction with the rotation of the movable bearing body 23 around the longitudinal axis 23A.

At the left and right ends of the upper surface of the floating member 30,
As shown in FIG. 5, a receiving portion 31 that receives the bottom plate 18 of the main body 10 is protruded, and the bottom plate 18 of the main body 10 is
By being received at 1, the main body 10 can take a horizontal attitude with respect to the running surface X. Further, as shown in FIG. 3, two insertion rods 33 are provided side by side at both left and right end portions on the front end side of the bottom plate 18 of the main body 10. The insertion rod 33 is stepped at the upper end and threaded, and is attached in a drooping manner by being screwed into a nut 34 fixed to the upper surface of the bottom plate 18 as shown in FIGS. Have been. On the other hand, the floating member 30
As shown in FIG. 4, a long hole 35 through which the insertion rod 33 is inserted is opened at a corresponding position on the front end side of the. The long hole 35 has a long shape in the front-rear direction to allow the insertion rod 33 to relatively move in the front-rear direction when the main body 10 is lifted as described later.

Around the insertion rods 33 on the lower surface of the bottom plate 18 of the main body 10, a spring seat 37 having a U-shape is fixedly fastened together, as shown in FIG.
, A compression coil spring 38 is fitted around the upper end of the compression coil spring 38, the lower end of the compression coil spring 38 is fitted on the upper surface of the floating member 30, and the bottom plate 18 and the floating member An urging force is applied in a direction in which the gap 30 is separated. As shown in FIG. 7, a connecting plate 39 is provided and screwed between adjacent protruding ends of the left and right adjacent insertion rods 33 on the lower surface side of the floating member 30.

In this embodiment, the compression coil spring 38 is provided only around the outer insertion rod 33 on each of the left and right sides.
Is installed. A window hole 28 is opened at a position closer to the right side as viewed from the front in the above-mentioned floating member 30, and a receiving member 29 is attached to a lower surface side of the window hole 28 as shown in FIG. 5. . This receiving member 29
It is formed in a box shape having an opening 29A on the front surface. On the other hand, a first jack 41 for floating is attached to the bottom plate 18 of the main body 10 at a position corresponding to the position above the window hole 28, and the lower end of the first jack 41 is inserted into the receiving member 29 through the window hole 28. Have been.

The first jack 41 has a structure shown in FIGS. A rectangular mounting plate 43 is provided on the upper surface of the cylindrical main body 42, and a rod 44 provided with a pressing plate 45 at the tip is fitted on the lower end side so as to be able to advance and retreat. The rod 44 is always urged to move in the retreating direction by a spring elastic force (not shown), and the rod 44 is retracted by a support shaft 46 provided in a middle position of the rod 44 penetrating the lower edge of the cylindrical main body 42. Has been stopped.

The jack 41 is provided with a pedal pressure pedal 48 and a release pedal 54. The pedaling pedal 48 is formed by pressing one end of a pair of levers 49 formed in a rectangular shape with a pedaling portion 50.
The lever 49 is disposed so as to sandwich the rod 44, and the bent portion of the lever 49 is rotatably supported by the support shaft 46. A short link 51 is provided between the other ends of both levers 49 and the lower surface of the mounting plate 43 and connected by pins 52 and 53. The lever 49 and the link 51 constitute a crank / slide mechanism which is a kind of the link mechanism A. Note that a stopper plate 59 (see FIG. 10) is provided on the connection end side of the two links 51 with the lever 49. When the rod 44 is at the retracted position, as shown in FIG. 9, the treading portion 50 of the lever 49 takes an obliquely upward position, and the other end of the lever 49 and the link 51 form a connecting portion. It is set so as to take a posture of a letter shape to be projected backward (to the right in FIG. 9).

One release pedal 54 is a pedal pressure pedal 48.
It is one size smaller than that, and is arranged approximately inside the pedaling pedal 48. The release pedal 54 is formed by connecting one end sides of a pair of short levers 55 also formed in a U-shape with a stepping portion 56, and the bent portion of the lever 55 has a clearance with respect to the support shaft 46. It is penetrated and rotatably supported. A fulcrum pin 57 extends between the other ends of both levers 55. A connecting pin 58 is provided at a position slightly closer to the other end than the pivotal support position of both levers 49 of the pedaling pedal 48, and the connecting pin 58 is connected to both levers 55 of the release pedal 54. It penetrates with a clearance at a position slightly closer to the other end than the pivot position. When the rod 44 is at the retracted position, as shown in FIG.
8 so that both ends of the lever 55 are inclined obliquely upward.

This jack 41 is used by fixing the mounting plate 43 at the upper end. When the pedal 44 in FIG. The link mechanism A causes the link 51 to rotate clockwise around the pin 53, and the lever 49 to rotate counterclockwise around the support shaft 46, thereby lowering the support shaft 46. , The rod 44 advances downward.

Beyond the point where the other end of the lever 49 and the link 51 are aligned on a straight line, the pedaling pedal 48 is
When the pedal is depressed to the position of 0, the connecting portion between the other end of the lever 49 and the link 51 bends in the opposite direction, and the spring force urging the rod 44 backward rotates the lever 49 counterclockwise. The connection portion acts to bend further, while the stopper plate 59 provided on the connection end side of the link 51 with the lever 49 abuts on the peripheral surface of the cylindrical main body 42, so that the lever 49 is further extended. Rotation is regulated,
The depression pedal 48 is locked at the stepping position shown in the drawing, and the rod 44 is also locked at the forward position. The release pedal 54 rotates slightly counterclockwise, and the fulcrum pin 57
Is in contact with the peripheral surface of the cylindrical main body 42. Stepping part 5
6 protrudes above the lever 49 of the pedaling pedal 48.

On the other hand, from the state shown in FIG.
Is depressed, the lever 5 of the release pedal 54 is depressed.
5 rotates counterclockwise in FIG. 5 around a fulcrum pin 57 that is in contact with the cylindrical main body 42, and accordingly rotates the lever 49 of the pedal depression pedal 48 clockwise through the connecting pin 58. . As a result, the lever 49 and the link 51 cross over the conceivable point from the opposite direction, and the lock at the stepping position of the pedaling pedal 48 and the lock at the forward position of the rod 44 are released. Then, the link 44 is rotated counterclockwise around the pin 53 and the lever 49 is rotated clockwise around the support shaft 46 by the spring force for urging the rod 44 to retract. It is retracted upward, and stops at the original position when the support shaft 46 hits the lower edge of the tubular main body 42.

In order to attach the first jack 41 as described above, an attaching portion 61 is provided on the lower surface of the bottom plate 18 of the serving car 10 as shown in FIG. The mounting plate 43 of the first jack 41 is mounted in a suspended state, and faces the receiving member 29 from the window hole 28 of the floating member 30. The pressing plate 45 at the lower end of the rod 44 is opposed immediately above the bottom plate of the receiving member 29, and the pressing portions 50, 56 of the pedals 48, 54.
Project forward through the opening 29A.

A second jack 41A for stopping the main body 10 is mounted on the lower surface of the floating member 30 on the side of the mounting position of the receiving member 29. The second jack 41A has the same structure as the first jack 41 for floating. In order to attach the second jack 41A, as shown in FIG. 4, an attachment portion 61A is provided on the lower surface of the floating member 30 so as to protrude downward.
The mounting plate 43 of the second jack 41A is attached to 1A in a suspended state. When the rod 44 is in the retracted position, the pressing plate 45 at the lower end is floating from the running surface X, and when the rod 44 is extended to the forward position, the pressing plate 45 is pressed against the running surface X.

As shown in FIG. 7, the receiving member 29 accommodating the first jack 41 has an opening 29A on the front surface thereof.
A restricting plate 63 for restricting an operator's foot from entering the back more than necessary is stretched so as to cover the upper end of the second jack 41A, and a similar restricting plate 63A is also provided at the installation position of the second jack 41A. It is stretched. On the first jack 41 side, as shown in FIG. 6, a T-shaped regulating plate 64 is provided below the regulating plate 63 so as to vertically penetrate the release pedal 54 and the pedaling pedal 48. Pedal 54, 48
It is regulated that the foot enters more than necessary during the period. As shown in FIG. 2, the above-mentioned floating member 30 is provided on both left and right edges of the lower surface of the bottom plate 18 of the main body 10 on the front end side.
A lateral displacement regulating plate 65 capable of sandwiching the left and right side surfaces of the rim is projected. Here, it is desirable that the lateral displacement restricting plate 65 has a height dimension that is always in a sandwiched state in a range where the floating member 30 relatively moves up and down as described later. It is desirable to apply a surface treatment to the sliding contact surface with the regulating plate 65 so as to reduce the frictional resistance.

This embodiment has the above-described structure,
Subsequently, the operation will be described. In a state where the locks of the jacks 41 and 41A are released, the front and rear free wheels 15F and 15R and the fixed wheel 16 therebetween are in a state of being placed on the running surface X as shown in FIG. By pulling or pushing with the handle provided on the front end surface, the catering car can be run straight and stably, and when turning a corner, the free wheels 15F and 15R change directions and smoothly. Bend, and 10A entrance of the serving car
In the case of reversing the front and back (left and right) surfaces provided with, it can be handled such that the main body 10 is rotated around the center.

On the other hand, when the front and back surfaces provided with the entrance and exit 10A of the catering car are attached to a wall, the catering cars are arranged side by side, etc.
Translate the serving truck in a direction perpendicular to the direction of travel,
In the case of so-called width adjustment, the following is performed. When the pedaling pedal 48 of the first jack 41 for levitation is depressed as shown in FIG. 12, the rod 44 is extended 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 floating member 30 cannot be lowered because the front free wheel 15F is on the running surface X, 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 rises while relatively swinging about the shaft 27. In addition,
When the depression pedal 48 is depressed to a predetermined position, the rod 44
Is locked in the extended state. Also, the bottom plate 18 of the main body 10
Coil spring 3 interposed between the helical member 30 and the floating member 30
Since the lifting of the main body 10 is assisted by the elasticity of 8, the first
The stepping force of the stepping pedal 48 in the jack 41 can be relatively small.

When the front end of the main body 10 is lifted as described above, the fixed wheel 16 floats from the running surface X while the front and rear free wheels 15F and 15R are in contact with the running 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 are moved along the vertical axis 23A.
The serving truck is translated as it is while turning around in the same direction. To release the mode of the parallel movement, when the release pedal 54 of the first jack 41 is depressed, the lock is released and the rod 44 contracts. As a result, the connection between the bottom plate 18 of the main body 10 and the floating member 30 is eliminated, so that the arm 25 is swung in the opposite direction to the above while the main body 1 is being swung.
The front end side of the sun sinks due to its own weight, and the fixed wheel 16 hits the running surface X, so that the main body 10 takes a regular horizontal posture. When the main body 10 sinks, the compression coil spring 38 functions as a cushioning material, and the main body 10 descends smoothly without receiving an impact.

Further, irrespective of whether the main body 10 is floating or not, the treading pedal 48 of the second jack 41A for stopping is stopped.
When the pedal is depressed, the rod 44 is extended and the pressing plate 45 at the lower end is extended.
Is pressed against the running surface X, and a catch is formed between the floating member 30 and the running surface X, so that the serving truck can be held in a stopped state. When the release pedal 54 of the second jack 41A is depressed, the lock is released and the rod 44 contracts, and the pressing plate 45 escapes above the running surface X and there is no blockage, so that the stop position is released.

As described above, according to the present embodiment,
After the fixed wheel 16 is lifted by depressing the treading pedal 48 of the first jack 41 for floating, the serving wheel can be easily moved to the side by pushing the serving vehicle from the side.
On the other hand, when the treading pedal 48 of the second jack 41A for stopping is depressed, the rod 44 is extended to engage the floating member 30 and the running surface X, and the serving truck is held in a stopped state. The normal moving state where the main body 10 is
In any of the parallel moving states in which the lifting member 30 is pushed up, the floating member 30 has the front free wheel 15F provided on the running surface X and is always at a fixed position from the running surface X. Second jack 41A for stopping on the lower surface of
Is provided, the second jack 41A for stopping can be reliably used and held in the stopped state regardless of the normal moving state or the parallel moving state. Also, both jacks 41, 41A for lifting and stopping
Since the stepping pedal 48 and the like are arranged protrudingly side by side on the front side where the handle is provided, the operator can concentrate and perform each moving operation and stopping operation at a predetermined location, and can operate efficiently.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) The present invention can be widely applied not only to a catering car but also to a general carrier equipped with wheels for movement.

[Brief description of the drawings]

FIG. 1 is a side view of a serving truck according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a bottom structure of the main body.

FIG. 3 is a perspective view of a bottom plate before an arm unit is attached.

FIG. 4 is a perspective view of an arm unit.

FIG. 5 is a perspective view of a floating member.

FIG. 6 is a perspective view of the state in which the bottom of the main body is lifted, as viewed from the front.

FIG. 7 is a perspective view of a front end side in a state where a bottom portion of the main body is lowered to an original position.

FIG. 8 is a perspective view of a jack.

FIG. 9 is a partially cutaway side view before the rod is extended.

FIG. 10 is a partially cutaway side view after the rod is extended.

FIG. 11 is a side view of the main body bottom in a normal running state.

FIG. 12 is a side view of the bottom of the main body in a parallel movement state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Storage room main body 15F, 15R ... Free wheel 16 ... Fixed ring 18 ... Bottom plate 19 ... Bearing bracket 22 ... Mounting bracket 23 ... Movable bearing body 23A ... Vertical axis 25 ... Arm 27 ... Shaft 30 ... Floating member 41 ... First Jack 41A ... Second jack 44 ... Rod 48 ... Tread pressure pedal 50 ... Tread pressure part 54 ... Release pedal 56 ... Tread pressure part X ... Travel surface

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidemasa Anzai 3-16 Sakaemachi Minamikan, Toyoake-shi, Aichi Prefecture Inside Hoshizaki Electric Co., Ltd. (72) Inventor Koichi Ito 3-16-16 Sakaemachi Minamikan, Toyoake-shi, Aichi Inside Electric Co., Ltd. (72) Inventor Fumiyuki Hori 3-16, Sakaemachi Minamikan, Toyoake-shi, Aichi Hoshizaki Electric Co., Ltd. F-term (reference) 3D050 AA01 BB05 DD03 EE11 FF03

Claims (2)

[Claims] 1. At the front and rear ends along the traveling direction at the bottom of the carrier body, there are adjustable wheels whose directions around the longitudinal axis are variable, and at positions between these two free wheels in the direction along the traveling direction. In a transport vehicle having fixed wheels fixed in direction, the fixed wheel and one of the front and rear free wheels are directly attached to the bottom of the main body, and the free wheel is attached to the bottom of the main body. The base end of the arm extending to the end side opposite to the side on which the arm is extended is pivotally supported, and the other free wheel is attached to a floating member provided at the extending end of this arm, A lifting jack is provided between the lifting member and the bottom of the main body. The lifting jack extends the rod in the vertical direction by the pedal pressure operation of the pedal. Up the rod Truck, characterized in that another jack for stop extending direction. 2. The transport vehicle according to claim 1, wherein the stepping portions of the pedals of both jacks are aligned with a predetermined edge of the bottom of the main body.