JP2002104660A - Loader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loader so formed that first, a shape is formed in a flat state and in a compact manner, and safety, working efficiency, and loading efficiency are improved, a risk on damage and breakage is eliminated, there is no trouble on a storage place, secondly, constitution is simplified and facilitated, motion stability, strength, durability are excellent, the occurrence of failure in operation is reduced and maintenance and management are facilitated, weight is decreased, and the loader is excellent in a cost. SOLUTION: The loader 1 is formed such that each inclining guide part 18 on the cargo receiving table approximately in a case-form state is held on a roller shaft 12 on the roller frame 2 side approximately in a case-form state. A link device 5 to move frontward and rearward and elevate the cargo receiving table 3 on a basis of the roller frame 2 is deposed in a containing space 15 of the roller frame 2. A link device 5 is provided with a link plate 24 situated between a crank part 23 on which the lower part of the roller frame 2 is pivotally mounted and the cargo receiving table 3, and an insertion hole 27 for an operation lever 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a loader.
That is, the present invention relates to a loader which is disposed on a floor surface of a freight vehicle or a warehouse, and is used for a cargo handling operation for transporting and taking out cargo.

[0002]

2. Description of the Related Art << Technical Background >> A cargo handling device such as a loader is used for carrying and unloading cargo on the floor of a cargo vehicle or a warehouse on which the cargo is placed. As this type of cargo handling device, for example, a loader that lifts, transports, and removes cargo using a groove formed in a floor surface, and various other cargo handling devices are used. First, there has been used a cargo handling device of a type in which rollers are disposed over the entire groove formed on the floor surface, and a load is carried on each of the rollers which always protrudes above the floor surface, and is carried and loaded and unloaded. However, this type has a drawback that the luggage is not placed directly on the floor surface, and the luggage is always movable, which is unstable. Therefore, a loading / unloading device such as a loader that can move up and down between an upper position where the load is raised above the floor and the load is lifted off the floor and a lower position where the load is lowered below the floor and the load is placed on the floor. But development,
Had been used.

<< Conventional Example >> For example, see
No. 2913 discloses that a loading frame with an inclined surface is placed on a roller of a roller frame that can travel and move in a rail groove on the floor surface, and the loading frame can be lifted and lowered by relative movement between the two. Type is shown. However, this type has a drawback that the relative movement between the roller frame and the loading frame is not easy when the load is loaded, and the lifting and lifting of the loading frame is not smooth. Therefore, Japanese Patent Application Laid-Open No.
As described in Japanese Patent No. 7246, a load engaging element with an inclined member is placed on a roller of a bogie body capable of traveling and moving in a rail groove, and a lever operating crank (bell crank) or a link is rotated by an operating lever. There has been developed a type of loader that moves a bogie body to move a load engaging element up and down by moving the bogie body. A loader conforming to this type is commercially available and widely used.

On the other hand, Japanese Patent Application Laid-Open No. 8-143121 discloses a rail sliding plate, an elevating rail, an inclined portion, rollers with a frame, and the like arranged in order from the bottom, and moving the elevating rail by moving means. The type in which each roller is moved up and down by being moved is shown. JP-A-2000-44
No. 025 discloses a type in which a roller frame having a load receiving roller is mounted on a base frame via an inclined guide, and the roller frame is moved up and down via a fixed frame by rotating a screw rod of an actuator. It is shown.

[0005]

[Problem to be Solved by the Invention] <First Problem> The following problems have been pointed out in such a conventional cargo handling device such as a loader. First, each of the above-mentioned conventional examples, particularly the loader disclosed in Japanese Patent Application Laid-Open No. 8-67246, and many commercially available loaders of a type equivalent thereto, are all difficult to handle compactly. The problem was pointed out. That is, in these loaders, the link device for moving / elevating, that is, the mounting position of the operating lever, the lever operating crank, the link, etc., are indispensable from the end of the loader body (bogie body or cargo engaging element). The structure is always large and protrudes upward. Accordingly, the storage portion of such a link device always has a shape protruding high above the loader body and the rail groove regardless of whether the link device is moved up and down. Therefore, a. There is a danger that the worker during the cargo handling work may easily trip over the projecting shape of the loader projecting from the rail groove of the floor. b. Therefore, this loader must be pulled out and removed from the rail groove on the floor of cargo vehicles and warehouses, and stored separately, even when not in use during cargo handling as well as after cargo handling. Is bad. c. During such pull-out, removal, and storage operations, the loader is accidentally dropped onto the ground or the like, and the loader is often damaged or damaged. d. In particular, in the case of a freight vehicle, there was a problem with the storage location of the loader pulled out and removed from the rail groove. e. It has also been pointed out that when a loader is stored on the floor of a freight vehicle or warehouse, the space for loading the luggage is limited by that much, which reduces the loading and storage capacity of the luggage and lowers the loading efficiency. Was.
f. In particular, in the case of a van type vehicle as a freight vehicle, if the loader has a protruding shape that protrudes from the floor surface, when loading with a forklift or the like, the pallet (load) contacts the protruding shape portion, The loader was sometimes damaged or damaged. In addition, a problem may occur in the load capacity of the load due to restrictions from above and below the projecting portion of the loader and the ceiling (rear opening surface) of the van type vehicle.

<< Second Problem >> Secondly, each of the conventional examples described above, for example, those disclosed in JP-A-8-143121 and JP-A-2000-44025 has complicated mechanisms and structures. Was pointed out.
That is, these loading and unloading devices are of the type of lifting and transporting loads by rollers, and their moving mechanism and lifting mechanism are very complicated. There is a question about the smoothness and stability of the lifting operation, and b. It is easy to be damaged and broken by the local load of the luggage, and there are problems in strength and durability,
c. Maintenance is troublesome due to many failures, d. Problems such as heavy weight and high cost have been pointed out.

<Regarding the Present Invention> In view of such circumstances, the present invention has been made in order to solve the above-mentioned problems of the conventional example, and is provided on each roller shaft on the roller frame side having a substantially box shape. A link device for holding and placing the respective guide portions on the side of the load receiving table in a substantially box shape and for moving the load receiving table back and forth and up and down with respect to the roller frame is disposed in a storage space formed in the roller frame. . The link device is characterized by comprising a crank portion having a lower portion pivotally attached to the roller frame, a link plate between the load receiving table, and an insertion hole for the operation lever. Accordingly, the present invention aims to propose a loader for cargo handling work having such a configuration, firstly, having a flattened and compact shape, and secondly, a simplified configuration. I do.

[0008]

[Means for Solving the Problems] << Technical Means >>
The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows.
In other words, the loader according to claim 1 is capable of moving rail tracks formed in front and rear parallel with respect to the floor surface of a cargo vehicle or a warehouse on which cargo is placed, and a lower roller frame and an upper receiving tray. , Has. The roller frame includes a plurality of rollers, is capable of traveling in the rail groove, and is provided with a link device. The receiving platform is
While being placed on the roller frame via the guide portion, at least the upper part is raised on the rail groove to lift the load from the floor surface, and the load is lowered into the rail groove and the load is placed on the floor surface. It can be moved up and down to a lower position where it can be placed. The guide portion has a shape inclined forward and backward. The link device is disposed in a storage space formed at a rear end of the roller frame, and performs a link operation based on an operation. The load receiving table can move forward and backward with respect to the roller frame based on the link operation of the link device, and can move up and down to the upper position and the lower position by being guided by the guide unit by the forward and backward movement. Is characterized by the following.

Next, claim 2 is as follows. That is, in the loader according to the second aspect, in the loader according to the first aspect, the roller frame has a substantially box shape with at least an upper surface opened. The receiving table has a substantially box shape with at least a lower surface opened, and at least an upper portion protrudes above the roller frame at the upper position, and is housed in the roller frame at the lower position. The guide portions are respectively formed at lower end edges of both left and right side surfaces of the load receiving tray, and are formed in a left-right pair and a plurality of front and rear portions are held on a roller shaft of each of the rollers on the roller frame side. It is characterized by the following.

Next, claim 3 is as follows. That is, in the loader according to the third aspect, in the loader according to the first aspect, the link device includes a crank portion having a lower portion pivotally connected to the roller frame with a horizontal axis, and one end portion having a horizontal portion at an upper portion of the crank portion. A link plate pivotally attached to a shaft and having the other end pivotally attached to a rear portion of the loading table by a horizontal axis; and an insertion hole formed in the crank portion, into which a tip of an operation lever can be inserted. It becomes. When the operation lever inserted into the insertion hole is in the vertical position, the crank portion and the link plate are completely stored in the storage space of the roller frame, and the loading tray takes the lower position. Further, when the operation lever inserted into the insertion hole is in a tilted posture, at least the upper portion of the crank portion or the link plate projects above the storage space of the roller frame, and the load receiving table assumes the upper position. It is characterized by the following.

<< Operation >> The present invention is configured as described above, and is as follows. When the operation lever is in the vertical position, the crank portion of the link device and the link plate have an extended link relationship, and are completely stored in the storage space of the roller frame. The load receiving table is pushed forward by the link plate, moves forward, and is guided by the guide portion to take a lower position in which it is lowered into the rail groove, and is stored in the roller frame. On the other hand, when the operating lever is in the inclined position, the crank portion of the link device and the link plate have a bent link relationship, and the upper portion protrudes into the storage space of the roller frame. The load receiving table is pulled back by the link plate and retreats, and is guided by the guide portion, takes an upper position where the upper portion protrudes above the roller frame, and rises above the rail groove.

Therefore, when carrying a load to the floor of a freight vehicle or a warehouse, first, a loader having the load receiving table at a lower position is placed in a rail groove below the load once placed on the floor exit side from the outside. After the insertion, the load is lifted with the operation lever in the tilted position and the loading tray in the upper position. Then, after the loader is moved forward to carry the load to the center or the back of the floor, the load is placed on the floor with the operation lever in the vertical position and the receiving tray at the lower position. On the other hand, when unloading cargo from the floor of a freight vehicle or warehouse, first install a loader with the loading table at the lower position in the rail groove under the luggage placed on the center side or the back side of the floor. After the insertion, the load is lifted with the operation lever in the tilted position and the loading tray in the upper position. Then, after the loader is moved backward to carry the load to the floor exit side, the operation lever is set to the vertical position, the loading tray is set to the lower position, and the load is temporarily placed on the floor exit side, and then carried out. .

[0013] First, the load receiving table and the link device of the loader protrude above the roller frame only when lifting and carrying the load, and have a substantially box shape when the load is not lifted or when not in use. Completely stored inside the roller frame. That is, the shape of the loader is always flat and compact. Second, this loader combines a roller frame having rollers, a storage space, and the like, a loading table having a guide portion, and a link device having a crank portion, a link plate, an insertion hole, and the like. , Consisting of a simple configuration.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS << About Drawings >>
This will be described in detail based on an embodiment of the invention shown in the drawings. 1, 2, 3, 3, 4, 5, 6, 7, etc.
An embodiment of the present invention will be described. FIG. 1 is a plan view showing a case where the receiving tray is at a lower position, and FIG.
FIG. 3 is a partially cutaway side view showing the case where the loading tray is at the lower position, and FIG. 3 is a partially broken side view showing the loading tray at the upper position. FIG. 4 is a front sectional view, and FIG.
(2) The figure shows a case where the receiving table is at the upper position. FIG.
Indicates a roller frame, (1) is a plan view,
(2) The figure is a side view. FIG. 6 shows the receiving platform,
(1) is a plan view, and (2) is a side view. FIG. 7 (1) is a side view showing a cargo handling step of a freight vehicle, FIG. 7 (2) is a side view showing another step of the cargo handling, and FIG. 7 (3) is a floor rail. The plan view of the groove and the like, and FIG. 4D is a front sectional view of the rail groove on the floor surface.

<< Regarding the Loader 1 >> As shown in FIG. 7, the loader 1 is formed to be parallel to the floor C of the cargo vehicle B on which the load A is placed and the floor C of the warehouse. The rail groove D can be moved. That is, freight vehicle B
, A plurality of, for example, two parallel rail grooves D are formed in the floor surface C in the front-rear direction and the longitudinal direction. The rail groove D has a concave shape in cross section, and the loader 1 is disposed inside the rail groove D with a slight left-right space.
The rail groove D is formed by embedding and attaching a member having a concave cross section to the floor surface C, or by directly notching a groove having a concave cross section on the floor surface C. In the figure, E is a pallet on which the load A is placed, and F is a forklift, which transports the load A placed on the pallet E to the floor C of the freight vehicle B. And the loader 1 is a lower roller frame 2
And an upper receiving table 3 made of, for example, stainless steel. Hereinafter, such a loader 1 will be described in detail.

<< Roller Frame 2 >> First, the roller frame 2 will be described. The roller frame 2 of the loader 1 has a substantially box shape with at least an upper surface opened. The roller frame 2 includes a plurality of rollers 4, can run in the rail groove D, and has a link device 5 attached to a rear portion.

With respect to such a roller frame 2,
This will be described in more detail with reference to FIG. 5 and FIGS. 1, 2, 3 and 4. As shown in FIG.
Has a substantially box shape with an open top. That is, as shown in FIG. 4, the left and right width dimension and the height dimension are set slightly smaller than the left and right width dimension and the depth dimension of the rail groove D, as shown in FIG. 4. , And have a length sufficient to travel in the rail groove D (see also FIG. 7). On the bottom surface 6 of the roller frame 2 having such a shape, as shown in FIG. 5A, a plurality of openings 7 for the rollers 4 are provided at intervals in the longitudinal direction.
Are formed in a number corresponding to the number. In FIG. 5A, reference numeral 8 is used when assembling the loader 1.
An attachment opening 9 is an opening corresponding to a position below the link device 5.

As shown in FIG. 5 (2), a plurality of shaft holes 11 are formed on both side surfaces 10 of the roller frame 2 so as to form a pair of left and right sides and are spaced apart in the front and rear longitudinal directions. Is formed. As shown in FIG. 2, FIG. 3, FIG. 4, etc., roller shafts 12 are disposed between the left and right shaft holes 11, respectively. Rollers 4 are attached to the central portion, respectively. The plurality of rollers 4 disperse and hold the load of the loader 1 and the load of the loaded luggage A, while passing through the opening 7 of the floor 6 of the roller frame 2 on the floor of the rail groove D. It is possible to travel. For example, seven roller shafts 12 and four rollers 4 are arranged in front and rear. Further, as shown in FIG. 5 (2), a pair of left and right set slots 13 are formed on both side surfaces 10 of the roller frame 2, and the set slots 13 are lowered before and after. Highly inclined. Then, as shown in FIGS.
Both ends of the set shaft 14 on the side are the roller frame 2
It is attached to this set slot 13 on the side so as to be able to move back and forth. With the set slot 13 and the set shaft 14, the load receiving table 3 that moves back and forth and moves up and down with respect to the roller frame 2 is regulated so as not to come off.

As shown in FIG. 1, FIG. 2, FIG. 3, etc., a roller frame 2 having a substantially box shape with an open upper surface includes:
The forward / backward movable load receiving table 3 is internally fitted and stored, and the rear end portion is a dedicated space for storing a link device 5 described later. In other words, most of the front, center, and rear portions of the roller frame 2 are storage spaces for the loading tray 3 that allow for forward and backward movement, but the rear end of the rear portion is a storage space dedicated to the link device 5. The space 15 is secured. Further, as shown in FIGS. 1, 2, 3, etc., at the front end of the roller frame 2, the support frame 16 is provided with side rollers 17 on the vertical axis in a left-right pair. .
In the illustrated example, the front surface of the roller frame 2 is closed by such a support frame 16 and the like, and the rear surface is closed by a rear wall. The roller frame 2 is configured as described above.

<< Receiving Table 3 >> Next, the receiving table 3 will be described. The load receiving table 3 serving as a load receiving frame of the loader 1 has a substantially box shape with at least an open lower surface, and is mounted on the roller frame 2 via a guide portion 18.
Then, the loading tray 3 has an upper position G at which the upper part at least rises above the rail groove D and can lift the load A from the floor surface C,
It can be moved up and down to the lower position H where it can descend into the rail groove D and place the load A on the floor surface C. At the upper position G, at least the upper part protrudes above the roller frame 2, and at the lower position H, the roller frame 2
Is stored inside. Further, based on the link operation of the link device 5, the receiving table 3 can move back and forth with respect to the roller frame 2, and is guided by the guide portion 18 by this forward and backward movement, and moves to the upper position G and the lower position H. It can be moved up and down.

The receiving table 3 will be described in more detail with reference to FIG. 6 and FIGS. 1, 2, 3 and 4. As shown in FIG. 6, the receiving table 3 has a substantially box shape with the lower surface and the rear surface opened. That is, as shown in FIG. 4, the width of the left and right sides and the height of the roller frame 2 are substantially box-shaped with an open top as described above. In addition, sliding contact, internal fitting, and storage are set. The length of the receiving table 3 is set slightly shorter than that of the roller frame 2. In other words, as mentioned above,
The roller frame 2 is set to be storable in consideration of the space for the forward and backward movement and the space of the storage space 15 for the link device 5. The luggage A (see FIG. 7) is to be placed on the upper surface 19 of the loading tray 3 having such a shape. Guide portions 18 described below are cut out on both side surfaces 20 of the loading tray 3.

As shown in FIG. 2, FIG. 3, FIG. 4, and FIG.
The roller frame 2 is formed on the lower end edge of the roller frame 2, and is formed on the roller shaft 12 of each roller 4 on the roller frame 2 side.
In the illustrated example, a total of 14 guide portions 18 are formed, two on the left and right and seven on the left and right at intervals in the longitudinal direction.
Each of the guide portions 18 is formed as a notch inclined forward and rearward and lower and higher forward and rearward. Each is attached. Each guide portion 18 is placed and held on each of the right and left ends of the roller shaft 12 on the roller frame 2 side.

As described above, the loading tray 3 is placed on the roller shaft 12 and the roller frame 2 via the guides 18 on the side surfaces 20. And the receiving platform 3
Moves back and forth with respect to the roller frame 2,
The guide section 18 interposed therebetween allows the roller frame 2 to move up and down. First, as shown in FIG. 1, FIG. 2 and FIG. That is, when the load receiving table 3 moves forward with respect to the roller frame 2, the load receiving table 3 is held and supported by the roller shafts 12 and the roller frames 2 at the stopper portions 22 at the rear higher positions of the guide portions 18. And the receiving platform 3
Takes the lower position H. Next, as shown in FIG. 3 and FIG. That is, when the receiving table 3 moves backward with respect to the roller frame 2, the receiving table 3
At the front lower stopper portion 21 of each guide portion 18, it is held and supported by each roller shaft 12 and the roller frame 2, so that the receiving table 3 takes the upper position G.

The receiving table 3 at the lower position H is, as shown in FIG.
It is lowered and stored in the roller frame 2, and of course,
It descends in the rail groove D and below the floor surface C. So,
When the load A exists over the load receiving table 3 of the loader 1 and the floor C of the freight vehicle B or the like, the load A is placed on the floor C instead of the loader 1. Will be placed. On the other hand, as shown in the drawing, the upper part of the cargo receiving table 3 at the upper position G has an upper surface 19 or the like protruding above the roller frame 2, rising above the rail groove D and floating above the floor surface C. Thus, when the load A is present over the load receiving table 3 of the loader 1 and the floor C of the freight vehicle B or the like, the load A is not on the floor C but on the loader 1. Will be placed on the

When the load receiving table 3 is moved back and forth, it is moved up and down by being guided by the inclination of the guide portion 18, and is stopped at the stopper portion 21 or 22 to thereby control the upper position G or the lower position H. I take the. The forward / backward movement and the vertical movement of the receiving table 3 are realized by linking the link device 5 described below. The receiving table 3 is configured as described above.

<< Regarding Link Device 5 >> Next, the link device 5 will be described. The link device 5 of the loader 1
Storage space 15 formed at the rear end of roller frame 2
And performs a link operation based on an operation. That is, the link device 5 includes a crank portion 23 having a lower portion pivotally attached to the roller frame 2 with a horizontal axis, and a crank portion 23.
A link plate 24, one end of which is pivotally mounted on the upper portion of the operation lever 25 at the horizontal axis, and the other end of which is pivotally mounted on the rear portion of the load receiving table 3 by a horizontal axis. And an insertion hole 27 through which the can be inserted. When the operation lever 25 inserted into the insertion hole 27 is in the vertical position J, the crank portion 23 and the link plate 24 are completely stored in the storage space 15 of the roller frame 2 and the load receiving table 3 is in the lower position H. I take the. When the operation lever 25 inserted into the insertion hole 27 is in the tilted posture K,
And at least the upper portion of the link plate 24 protrudes above the storage space 15 of the roller frame 2, and the loading tray 3 takes the upper position G.

With respect to such a link device 5, FIG.
This will be described in more detail with reference to FIGS. The crank portion 23 of the link device 5 is disposed at the rearmost end in a storage space 15 formed at the rear end of the roller frame 2. A first shaft 28, which is a horizontal axis on the left and right, is inserted through the lower portion of the crank portion 23,
The roller frame 2 is rotatably attached to a lower portion of the left and right side surfaces 10 of the roller frame 2 forming the storage space 15. On both left and right ends of the first shaft 28, rollers for rotating around the axis are provided. The link plate 24 as a connecting plate of the link device 5 is formed of a pair of left and right long plates. And both link boards 2
Reference numeral 4 denotes a common second shaft 29, which is a common left and right horizontal axis, and has a rear end, which is one end thereof, slidably in contact with the front upper portion of the crank portion 23 so as to be sandwiched from both sides. Have been. The second shaft 29 is inserted through the crank part 23. In the illustrated example, a front end portion, which is the other end portion of each of the link plates 24, is connected to a rear portion of the receiving table 3 through a stay 30, and a third shaft 31 which is a common left and right horizontal axis inserted therethrough.
And is rotatably mounted. The stay 30 has a front portion attached to and fixed to a rear portion of the loading tray 3 and a rear portion projecting rearward from the loading tray 3 in the form of a pair of left and right vertical long plates. For both rears,
The distal ends of both link plates 24 are slidably contacted with each other, and are rotatably mounted on a third shaft 31 inserted therethrough.

Note that the left and right ends of the first shaft 28 penetrating the crank portion 23 are respectively provided with running rollers 32.
Is mounted, and can run on the floor surface of the rail groove D via the opening 9 (see FIG. 5 (1)) formed in the bottom surface 6 of the roller frame 2 described above. In the figure, reference numeral 33 denotes a side guide plate, which is formed with a guide elongated hole 34 which is low at the front and tilted high at the rear. The side guide plates 33 are attached and fixed respectively to the inner surfaces of both side surfaces 10 forming the storage space 15 of the roller frame 2. , Is to be guided. At both left and right ends of the third shaft 31,
A roller for rotation about the axis is provided.

In the illustrated example, the insertion hole 27 of the link device 5 is formed through the central portion of the crank portion 23 at an angle perpendicular to the first shaft 28 and the second shaft 29. And for such an insertion hole 27,
The distal end 26 of the operation lever 25 for manual operation can be inserted. Step portions are formed before and after the distal end portion 26. The operation lever 25 has a function of elevating and lowering the load receiving table 3 and is also used for pushing the loader 1 forward as a whole and for pulling the loader 1 backward as a whole.

When the operation lever 25 inserted into the insertion hole 26 is in the vertical posture J as shown in FIGS. I take the.
That is, when the operation lever 25 is in the vertical posture J, the crank part 23 and the link plate 24 of the link device 5 both take a horizontal posture, are completely stored in the storage space 15, and are substantially linear in the front-rear direction. It becomes an extended positional relationship, and becomes a link relationship that is separated back and forth about the second shaft 29. As a result, the loading tray 3 is pushed forward by the link plate 24 and the stay 30, and assumes a position moved forward with respect to the roller frame 2. Along with such a forward movement, the receiving table 3 is held against the roller shaft 12 and the roller frame 2 at the stopper portion 22 located at the rear higher position of the guide portion 18, so that the receiving table 3 takes the lower position H. .

On the other hand, as shown in FIGS. 3 and 4 (2) and the like, the operation lever 2 inserted into the insertion hole 26 is not shown.
In the case where 5 is the tilting posture K that has been pulled down rearward, the loading tray 3 takes the upper position G. That is, when the operation lever 25 is in the tilting posture K, the crank portion 23 and the link plate 24 of the link device 5 take the first shaft 28 as a fulcrum, take a vertical posture, and both upper portions protrude above the storage space 15. At the same time, approaching around the protruding second shaft 29,
Bending, overlapping positional relationship, and link relationship. As a result, the load receiving tray 3 is pulled rearward with respect to the roller frame 2 via the link plate 24 and the stay 30, and assumes a position where it has moved backward. Along with such retreating, the loading tray 3 is held against the roller shaft 12 and the roller frame 2 at the lower front stopper portion 21 of the guide portion 18, and the loading tray 3 assumes the upper position G. Link device 5
Is like this.

<< Operations and the Like >> The loader 1 of the present invention comprises:
The configuration is as described above. Then, it becomes as follows. Rail groove D is provided on freight vehicle B and warehouse floor C.
The loader 1 is disposed in each rail groove D, and can move the rail groove D back and forth, respectively (see FIG. 7). Having. The lower roller frame 2 has a substantially box shape with an open upper surface (see FIG. 5 and the like).
It is provided with a plurality of rollers 4 and can travel in the rail groove D of the floor surface C.
A link device 5 is provided (see FIG. 1, FIG. 2, FIG. 3, FIG. 4, etc.). The upper receiving tray 3 has a substantially box shape with an open lower surface (see FIG. 6 and the like), and is placed on the roller frame 2 via the guide portion 18 (see FIGS. 2, 3 and 4 and the like). ). The guide portion 18 has a shape inclined forward and backward, and is formed at the lower end edge of each of the left and right side surfaces 20 of the loading tray 3, and is formed in a left-right pair and a plurality of front and rear portions.
Each roller 4 on the roller frame 2 side is held on a roller shaft 12.

Therefore, when carrying out the cargo handling work of transporting the cargo A to and from the cargo vehicle B and the floor C of the warehouse, the loader 1 is arranged in the rail groove D below the cargo A, respectively.
Each is used as follows (see FIG. 7). First, the distal end portion 26 of the operation lever 25 is inserted into the insertion hole 27 of the crank portion 23 of the link device 5. And operation lever 2
When the vertical posture J is 5 (FIG. 1, FIG. 2, FIG. 4, (1)
The crank portion 23 and the link plate 24 of the link device 5 have a link relationship extended based on the link operation, and are completely stored in the storage space 15 of the roller frame 2 (see the drawings). Then, the loading tray 3 is pushed by the link plate 24, and is located at a position where the loading tray 3 is moved forward with respect to the roller frame 2, and is guided by the guide portion 18 to be in the rail groove D and below the floor surface C. Take the lower position H,
It is stored in the roller frame 2. Thus, the luggage A can be placed on the floor C.

On the other hand, when the operation lever 25 is tilted
(See FIGS. 3 and 4 (2) and the like), the crank portion 25 of the link device 5 and the link plate 24 have a link relationship bent based on the link operation, and the upper portion is a roller frame. 2 and protrudes above the storage space 15. The load receiving table 3 is pulled by the link plate 24 and is at a position where it is retracted rearward with respect to the roller frame 2, and is guided by the guide portion 18, and
It takes an upper position G where the upper part protrudes upward, rises above the rail groove D, and floats on the floor surface C. Thus, the load A can be lifted from the floor C and transported.

Therefore, when carrying the cargo A to the cargo vehicle B or the floor C of the warehouse (see also FIG. 7 (1)), first, the cargo A is carried in from the outside and temporarily placed on the exit side of the floor C. The loader 1 with the load receiving table 3 at the lower position H is inserted into the rail groove D below the luggage A (see FIGS. 1, 2 and 4 (1)). Then, the load A is lifted on the upper surface 19 of the loading tray 3 by moving the operation lever 25 from the vertical attitude J to the tilting attitude K and raising the loading tray 3 from the lower position H to the upper position G (FIG. 3, FIG. (See FIG. 4 (2)). Thereafter, by moving the loader 1 forward and moving as it is (pushing the load A or pressing the operation lever 25), the load A is moved to the center side or the back side of the floor surface C. (See FIG. 7 (1)). And operation lever 2
5 is changed from the tilting posture K to the vertical posture J, and the receiving table 3 is moved to the upper position G.
, The luggage A is placed on the center side or the back side of the floor C from above the upper surface 19 of the loading tray 3 (see FIGS. 1, 2 and 4). (1) Refer to the figures etc.). Thus, the load A is carried in.

On the other hand, when unloading the cargo A from the cargo vehicle B or the floor C of the warehouse (see also FIG. 7 (1)), first, the cargo A is placed on the center side or the back side of the floor surface C. The loader 1 with the receiving stand 3 in the lower position H in the rail groove D below the loaded luggage A
(Refer to FIG. 1, FIG. 2, FIG. 4, (1) diagram, etc.).
Then, by moving the operation lever 25 from the vertical position J to the tilting position K and raising the load receiving table 3 from the lower position H to the upper position G, the luggage placed on the center side or the back side of the floor surface C is obtained. A is lifted on the upper surface 19 of the loading tray 3 (FIGS. 3 and 4).
(See FIG. 2 (b)). Thereafter, the loader 1 is moved backward and moved as it is (the load A).
Or pulling by pulling the operation lever 25) to carry the load A to the floor C exit side. Then, by moving the operation lever 25 from the tilted position K to the vertical position J and lowering the load receiving table 3 from the upper position G to the lower position H, the load A can be moved from the upper surface 19 of the previous load receiving table 3 to the floor C. Place once on the exit side (see FIGS. 1, 2 and 4 (1), etc.). Then, the package A is carried out.

<< Regarding compactness, etc. >>
The loader 1 has the following first and second configurations. First
In the loader 1, only when the load A is lifted and transported, the load receiving table 3 and the link device 5 are connected to the roller frame 2 only.
It protrudes upward (see FIGS. 3 and 4 (2) and the like), and the luggage A
When the lifter is not carried up or is not used, the load receiving platform 3 and the link device 5 keep the roller frame 2 having a substantially box shape.
(See FIGS. 1, 2 and 4 (1)). In other words, the shape of the loader 1 is always flat and compact. Therefore, for example, the loader 1 already arranged in the rail groove D can move under the load A newly placed next on the floor C (see FIG. 7B). ), The cargo handling operation by the forklift F (see FIG. 7A) is not interrupted.

<< Simplification of Configuration >> Secondly, this loader 1 has a substantially box-shaped roller frame 2 provided with rollers 4, a storage space 15 and the like, and a substantially box-shaped roller frame 2 provided with a guide portion 18. It has a simple configuration by using a combination of the receiving table 3 and the link device 5 having the crank portion 23, the link plate 24, the insertion hole 27, and the like.

[0039]

<< Characteristics of the present invention >> As described above, the loader according to the present invention has the respective guides on the substantially box-shaped load receiving table side on the respective roller shafts on the substantially frame-shaped roller frame side. A link device is provided in the storage space formed in the roller frame for holding and placing the unit, and for moving the load receiving table back and forth with respect to the roller frame, and ascending and descending. The following effects are exhibited by configuring the link device with the link portion between the crank portion whose lower portion is pivotally attached to the roller frame, the load receiving table, and the operation lever insertion hole.

<< First Effect >> First, the shape is made flat and compact. That is, in this loader, a storage space is formed at the rear end of a substantially box-shaped roller frame having an open upper surface, and a link device is disposed in the storage space. The link device is configured such that the lower part of the crank portion is pivotally attached to the roller frame, and when the receiving table is placed in the lower position and stored in the roller frame, it is completely stored in the storage space of the roller frame. In other words, like the above-mentioned conventional loader,
The link device and its storage part do not always protrude greatly upward at all times. With this loader, only when the load is lifted and carried, the load receiving cradle and the link device protrude above the roller frame to lift the load. When not in use or when not in use, the receiving table and the link device are stored in a roller frame or a rail groove having a substantially box shape.

As described above, the loader is always flat and compact in shape. Thus, this loader comprises: a. Workers during loading and unloading work do not trip, and safety is improved. b. Therefore, it is not necessary to pull out, remove, and separately store the loader from the rail groove on the floor surface during and after the cargo handling work, and accordingly, the work is speeded up and the working efficiency is improved. c. The danger of damage or breakage due to dropping of the loader, which was pointed out during the pulling, removing, and storing operations, is also eliminated. d. The storage location of the loader when not in use can be in the rail groove, and there is no problem with the storage location. In particular, it is good to turn it over and store it in the rail groove. e. Since the loader does not need to be stored on the floor of the freight vehicle or the warehouse, the load / storage capacity of the load increases, and the load efficiency improves. f. In particular, in the case of a van type vehicle as a freight vehicle, the risk of the loader being damaged or damaged due to contact with a pallet (load) when loading with a forklift or the like is eliminated. Further, in addition to the restriction from above due to the ceiling (rear opening surface) of the van type car, the shape of the loader does not restrict the load capacity of the load from below, and the load capacity of the load increases accordingly. g. Further, since the loader can pass under the load placed on the floor, the loading operation by the forklift is not interrupted, the loading operation is continuous, and the work efficiency is improved from this aspect.

<< Second Effect >> Secondly, the configuration is simplified and simplified. In other words, this loader includes a substantially box-shaped roller frame having rollers, a storage space, and the like,
It has a configuration in which a substantially box-shaped receiving tray provided with a guide portion and a link device provided with a crank portion, a link plate, an insertion hole and the like are combined. That is, the mechanism for moving and lifting / lowering is simple and easy as compared with the above-described conventional loader and cargo handling device of this type. A. Lifting and lowering operation is smooth and stable; b. It is not damaged or broken by the local load of luggage, has excellent strength and durability, and c. Low maintenance and easy maintenance, d. Light weight and excellent in cost, e. Existing rail grooves in freight vehicles and warehouses can be used as they are, and this is also excellent in cost. As described above, the effects exhibited by the present invention are remarkable and large, for example, all the problems existing in this type of conventional example are solved.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an embodiment of a loader according to the present invention, and shows a case where a loading tray is at a lower position.

FIG. 2 is a partially cutaway side view for explaining the embodiment of the present invention, and shows a case where the loading tray is at a lower position.

FIG. 3 is a partially cutaway side view for explaining the embodiment of the present invention, and shows a case where the loading tray is at an upper position;

FIG. 4 is a front sectional view for explaining the embodiment of the present invention, and FIG.
(2) The figure shows a case where the receiving table is at the upper position.

5A and 5B are views for explaining the embodiment of the present invention, showing a roller frame, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

6A and 6B are views for explaining an embodiment of the present invention, showing a loading tray, wherein FIG. 6A is a plan view and FIG. 6B is a side view.

FIGS. 7A and 7B are explanatory views of an embodiment of the present invention, in which FIG. 1A is a side view showing a cargo handling step in a freight vehicle, and FIG. FIG. 3 (3) is a plan view of a rail groove or the like on a floor surface,
(4) The figure is a front sectional view of the rail groove on the floor surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loader 2 Roller frame 3 Receiving stand 4 Roller 5 Link device 12 Roller shaft 15 Storage space 18 Guide part 20 Side surface 23 Crank part 24 Link plate 25 Operation lever 26 Tip part 27 Insertion hole 28 First shaft (axis) 29 Second shaft (Axis) 31 Third shaft (Axis) A Luggage B Freight vehicle C Floor surface D Rail groove G Upper position H Lower position J Vertical posture K Tilt posture

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[Procedure amendment]

[Submission date] November 5, 2001 (2001.11.
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Loader

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a loader.
That is, the present invention relates to a loader which is disposed on a floor surface of a freight vehicle or a warehouse, and is used for a cargo handling operation for transporting and taking out cargo.

[0002]

2. Description of the Related Art << Technical Background >> A cargo handling device such as a loader is used for carrying and unloading cargo on the floor of a cargo vehicle or a warehouse on which the cargo is placed. As this type of cargo handling device, for example, a loader that lifts, transports, and removes cargo using a groove formed in a floor surface, and various other cargo handling devices are used. First, there has been used a cargo handling device of a type in which rollers are disposed over the entire groove formed on the floor surface, and a load is carried on each of the rollers which always protrudes above the floor surface, and is carried and loaded and unloaded. However, this type has a drawback that the luggage is not placed directly on the floor surface, and the luggage is always movable, which is unstable. Therefore, a loading / unloading device such as a loader that can move up and down between an upper position where the load is raised above the floor and the load is lifted off the floor and a lower position where the load is lowered below the floor and the load is placed on the floor. But development,
Had been used.

<< Conventional Example >> For example, see
No. 2913 discloses that a loading frame with an inclined surface is placed on a roller of a roller frame that can travel and move in a rail groove on the floor surface, and the loading frame can be lifted and lowered by relative movement between the two. Type is shown. However, this type has a drawback that the relative movement between the roller frame and the loading frame is not easy when the load is loaded, and the lifting and lifting of the loading frame is not smooth. Therefore, Japanese Patent Application Laid-Open No.
As described in Japanese Patent No. 7246, a load engaging element with an inclined member is placed on a roller of a bogie body capable of traveling and moving in a rail groove, and a lever operating crank (bell crank) or a link is rotated by an operating lever. There has been developed a type of loader that moves a bogie body to move a load engaging element up and down by moving the bogie body. A loader conforming to this type is commercially available and widely used.

On the other hand, Japanese Patent Application Laid-Open No. 8-143121 discloses a rail sliding plate, an elevating rail, an inclined portion, rollers with a frame, and the like arranged in order from the bottom, and moving the elevating rail by moving means. The type in which each roller is moved up and down by being moved is shown. JP-A-2000-44
No. 025 discloses a type in which a roller frame having a load receiving roller is mounted on a base frame via an inclined guide, and the roller frame is moved up and down via a fixed frame by rotating a screw rod of an actuator. It is shown.

[0005]

[Problem to be Solved by the Invention] <First Problem> The following problems have been pointed out in such a conventional cargo handling device such as a loader. First, each of the above-mentioned conventional examples, particularly the loader disclosed in Japanese Patent Application Laid-Open No. 8-67246, and many commercially available loaders of a type equivalent thereto, are all difficult to handle compactly. The problem was pointed out. That is, in these loaders, the link device for moving / elevating, that is, the mounting position of the operating lever, the lever operating crank, the link, etc., are indispensable from the end of the loader body (bogie body or cargo engaging element). The structure is always large and protrudes upward. Accordingly, the storage portion of such a link device always has a shape protruding high above the loader body and the rail groove regardless of whether the link device is moved up and down. Therefore, a. There is a danger that the worker during the cargo handling work may easily trip over the projecting shape of the loader projecting from the rail groove of the floor. b. Therefore, this loader must be pulled out and removed from the rail groove on the floor of cargo vehicles and warehouses, and stored separately, even when not in use during cargo handling as well as after cargo handling. Is bad. c. During such pull-out, removal, and storage operations, the loader is accidentally dropped onto the ground or the like, and the loader is often damaged or damaged. d. In particular, in the case of a freight vehicle, there was a problem with the storage location of the loader pulled out and removed from the rail groove. e. It has also been pointed out that when a loader is stored on the floor of a freight vehicle or warehouse, the space for loading the luggage is limited by that much, which reduces the loading and storage capacity of the luggage and lowers the loading efficiency. Was.
f. In particular, in the case of a van type vehicle as a freight vehicle, if the loader has a protruding shape that protrudes from the floor surface, when loading with a forklift or the like, the pallet (load) contacts the protruding shape portion, The loader was sometimes damaged or damaged. In addition, a problem may occur in the load capacity of the load due to restrictions from above and below the projecting portion of the loader and the ceiling (rear opening surface) of the van type vehicle.

<< Second Problem >> Secondly, each of the conventional examples described above, for example, those disclosed in JP-A-8-143121 and JP-A-2000-44025 has complicated mechanisms and structures. Was pointed out.
That is, these loading and unloading devices are of the type of lifting and transporting loads by rollers, and their moving mechanism and lifting mechanism are very complicated. There is a question about the smoothness and stability of the lifting operation, and b. It is easy to be damaged and broken by the local load of the luggage, and there are problems in strength and durability,
c. Maintenance is troublesome due to many failures, d. Problems such as heavy weight and high cost have been pointed out.

<Regarding the Present Invention> In view of such circumstances, the present invention has been made in order to solve the above-mentioned problems of the conventional example, and is provided on each roller shaft on the roller frame side having a substantially box shape. A link device for holding and placing the respective guide portions on the side of the load receiving table in a substantially box shape and for moving the load receiving table back and forth and up and down with respect to the roller frame is disposed in a storage space formed in the roller frame. . Then, the link device is in a positional relationship in which the link device projects or is completely stored with respect to the roller frame. , And is characterized by. Accordingly, the present invention provides the first
Secondly, it is an object of the present invention to propose a loader for cargo handling work having a flattened and compact shape, and secondly, a simplified configuration.

[0008]

[Means for Solving the Problems] << Technical Means >>
The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows.
In other words, the loader according to claim 1 is capable of moving rail tracks formed in front and rear parallel with respect to the floor surface of a cargo vehicle or a warehouse on which cargo is placed, and a lower roller frame and an upper receiving tray. , Has. The roller frame includes a plurality of rollers, is capable of traveling in the rail groove, and is provided with a link device. The receiving platform is
While being placed on the roller frame via the guide portion, at least the upper part is raised on the rail groove to lift the load from the floor surface, and the load is lowered into the rail groove and the load is placed on the floor surface. It can be moved up and down to a lower position where it can be placed. The guide portion has a shape inclined forward and backward. The link device is disposed in a storage space formed at a rear end of the roller frame, and performs a link operation based on an operation. The load receiving table can move forward and backward with respect to the roller frame based on the link operation of the link device, and can move up and down to the upper position and the lower position by being guided by the guide unit by the forward and backward movement. Is characterized by the following.

[0009] Claim 2 is as follows. That is, in the loader according to the second aspect, in the loader according to the first aspect, the height of the roller frame is set slightly smaller than that of the rail groove. In the upper position, at least the upper portion of the receiving table protrudes above the roller frame, and at the lower position, the receiving table is housed in the roller frame. At the upper position of the loading tray, the linking device projects at least an upper part on the roller frame, and at a lower position of the loading tray, the link device is completely housed in the roller frame. , Is characterized. Next, claim 3 is as follows. That is, in the loader according to the third aspect, in the loader according to the second aspect, the roller frame has a substantially box shape with at least an upper surface opened. The receiving table has a substantially box shape with at least a lower surface opened, and at least an upper portion protrudes above the roller frame at the upper position, and is housed in the roller frame at the lower position. The guide portions are respectively formed at lower end edges of both left and right side surfaces of the load receiving tray, and are formed in a left-right pair and a plurality of front and rear portions are held on a roller shaft of each of the rollers on the roller frame side. It is characterized by the following.

Next, claim 4 is as follows. That is, in the loader according to the fourth aspect, in the loader according to the second aspect, the link device includes a crank portion having a lower portion pivotally connected to the roller frame with a horizontal axis, and a control lever formed on the crank portion. And an insertion hole into which the tip can be inserted. In addition, a rear portion of the load receiving table is pivotally mounted on an upper portion of the crank portion via a horizontal axis guided by a long guide hole inclined forward and backward. Then, when the operation lever inserted into the insertion hole is in the vertical position, the crank portion is completely stored in the storage space of the roller frame, and the load receiving table is in the lower position. Further, when the operation lever inserted into the insertion hole is in a tilted posture, at least an upper portion of the crank portion projects above a storage space of the roller frame, and the loading tray takes the upper position. Features. Next, claim 5 is as follows. That is, in the loader according to the fifth aspect, in the loader according to the second aspect, the link device includes a crank portion having a lower portion pivotally connected to the roller frame with a horizontal axis, and an end portion having an upper end on the crank portion. A link plate pivotally mounted on the horizontal axis and having the other end pivotally mounted on the rear portion of the loading table on a horizontal axis, and an insertion hole formed in the crank portion, into which a tip of an operation lever can be inserted. Be prepared. When the operation lever inserted into the insertion hole is in the vertical position, the crank portion and the link plate are completely stored in the storage space of the roller frame, and the loading tray takes the lower position. Further, when the operation lever inserted into the insertion hole is in a tilted posture, at least the upper portion of the crank portion or the link plate projects above the storage space of the roller frame, and the load receiving table assumes the upper position. It is characterized by the following.

<< Operation >> The present invention is configured as described above, and is as follows. When the operation lever is in the vertical position, the link device, for example, has a link relationship in which the crank portion and the link plate are extended, and the link device is completely stored in the storage space of the roller frame. The loading table is pushed forward by, for example, a link plate and moves forward,
It is guided by the guide portion and takes a lower position lowered into the rail groove, and is stored in the roller frame. On the other hand, when the operation lever is in a tilted posture, for example, the crank portion of the link device and the link plate have a bent link relationship, and the upper portion of the link device protrudes above the storage space of the roller frame. The load receiving table is pulled backward by, for example, a link plate and retreats, and is guided by the guide portion to take an upper position where the upper portion protrudes above the roller frame, and rises above the rail groove.

Therefore, when carrying a load to the floor of a freight vehicle or a warehouse, first, a loader having the load receiving table at a lower position is placed in a rail groove below the load once placed on the floor exit side from the outside. After the insertion, the load is lifted with the operation lever in the tilted position and the loading tray in the upper position. Then, after the loader is moved forward to carry the load to the center or the back of the floor, the load is placed on the floor with the operation lever in the vertical position and the receiving tray at the lower position. On the other hand, when unloading cargo from the floor of a freight vehicle or warehouse, first install a loader with the loading table at the lower position in the rail groove under the luggage placed on the center side or the back side of the floor. After the insertion, the load is lifted with the operation lever in the tilted position and the loading tray in the upper position. Then, after the loader is moved backward to carry the load to the floor exit side, the operation lever is set to the vertical position, the loading tray is set to the lower position, and the load is temporarily placed on the floor exit side, and then carried out. .

[0013] First, the load receiving table and the link device of the loader protrude above the roller frame only when lifting and carrying the load, and have a substantially box shape when the load is not lifted or when not in use. Completely stored inside the roller frame. That is, the shape of the loader is always flat and compact. Second, this loader combines a roller frame having rollers, a storage space, and the like, a loading table having a guide portion, and a link device having a crank portion, a link plate, an insertion hole, and the like. , Consisting of a simple configuration.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS << About Drawings >>
This will be described in detail based on an embodiment of the invention shown in the drawings. 1, 2, 3, 3, 4, 5, 6, 7, etc.
An embodiment of the present invention will be described. FIG. 1 is a plan view showing a case where the receiving tray is at a lower position, and FIG.
FIG. 3 is a partially cutaway side view showing the case where the loading tray is at the lower position, and FIG. 3 is a partially broken side view showing the loading tray at the upper position. FIG. 4 is a front sectional view, and FIG.
(2) The figure shows a case where the receiving table is at the upper position. FIG.
Indicates a roller frame, (1) is a plan view,
(2) The figure is a side view. FIG. 6 shows the receiving platform,
(1) is a plan view, and (2) is a side view. FIG. 7 (1) is a side view showing a cargo handling step of a freight vehicle, FIG. 7 (2) is a side view showing another step of the cargo handling, and FIG. 7 (3) is a floor rail. The plan view of the groove and the like, and FIG. 4D is a front sectional view of the rail groove on the floor surface.

<< Regarding the Loader 1 >> As shown in FIG. 7, the loader 1 is formed to be parallel to the floor C of the cargo vehicle B on which the load A is placed and the floor C of the warehouse. The rail groove D can be moved. That is, freight vehicle B
, A plurality of, for example, two parallel rail grooves D are formed in the floor surface C in the front-rear direction and the longitudinal direction. The rail groove D has a concave shape in cross section, and the loader 1 is disposed inside the rail groove D with a slight left-right space.
The rail groove D is formed by embedding and attaching a member having a concave cross section to the floor surface C, or by directly notching a groove having a concave cross section on the floor surface C. In the figure, E is a pallet on which the load A is placed, and F is a forklift, which transports the load A placed on the pallet E to the floor C of the freight vehicle B. And the loader 1 is a lower roller frame 2
And an upper receiving table 3 made of, for example, stainless steel. Hereinafter, such a loader 1 will be described in detail.

<< Roller Frame 2 >> First, the roller frame 2 will be described. The roller frame 2 of the loader 1 has a substantially box shape with at least an upper surface opened. The roller frame 2 includes a plurality of rollers 4, can run in the rail groove D, and has a link device 5 attached to a rear portion.

With respect to such a roller frame 2,
This will be described in more detail with reference to FIG. 5 and FIGS. 1, 2, 3 and 4. As shown in FIG.
Has a substantially box shape with an open top. That is, as shown in FIG. 4, the left and right width dimension and the height dimension are set slightly smaller than the left and right width dimension and the depth dimension of the rail groove D, as shown in FIG. 4. , And have a length sufficient to travel in the rail groove D (see also FIG. 7). On the bottom surface 6 of the roller frame 2 having such a shape, as shown in FIG. 5A, a plurality of openings 7 for the rollers 4 are provided at intervals in the longitudinal direction.
Are formed in a number corresponding to the number. In FIG. 5A, reference numeral 8 is used when assembling the loader 1.
An attachment opening 9 is an opening corresponding to a position below the link device 5.

As shown in FIG. 5 (2), a plurality of shaft holes 11 are formed on both side surfaces 10 of the roller frame 2 so as to form a pair of left and right sides and are spaced apart in the front and rear longitudinal directions. Is formed. As shown in FIG. 2, FIG. 3, FIG. 4, etc., roller shafts 12 are disposed between the left and right shaft holes 11, respectively. Rollers 4 are attached to the central portion, respectively. The plurality of rollers 4 disperse and hold the load of the loader 1 and the load of the loaded luggage A, while passing through the opening 7 of the floor 6 of the roller frame 2 on the floor of the rail groove D. It is possible to travel. For example, seven roller shafts 12 and four rollers 4 are arranged in front and rear. Further, as shown in FIG. 5 (2), a pair of left and right set slots 13 are formed on both side surfaces 10 of the roller frame 2, and the set slots 13 are lowered before and after. Highly inclined. Then, as shown in FIGS.
Both ends of the set shaft 14 on the side are the roller frame 2
It is attached to this set slot 13 on the side so as to be able to move back and forth. With the set slot 13 and the set shaft 14, the load receiving table 3 that moves back and forth and moves up and down with respect to the roller frame 2 is regulated so as not to come off.

As shown in FIG. 1, FIG. 2, FIG. 3, etc., a roller frame 2 having a substantially box shape with an open upper surface includes:
The forward / backward movable load receiving table 3 is internally fitted and stored, and the rear end portion is a dedicated space for storing a link device 5 described later. In other words, most of the front, center, and rear portions of the roller frame 2 are storage spaces for the loading tray 3 that allow for forward and backward movement, but the rear end of the rear portion is a storage space dedicated to the link device 5. The space 15 is secured. Further, as shown in FIGS. 1, 2, 3, etc., at the front end of the roller frame 2, the support frame 16 is provided with side rollers 17 on the vertical axis in a left-right pair. .
In the illustrated example, the front surface of the roller frame 2 is closed by such a support frame 16 and the like, and the rear surface is closed by a rear wall. The roller frame 2 is configured as described above.

<< Receiving Table 3 >> Next, the receiving table 3 will be described. The load receiving table 3 serving as a load receiving frame of the loader 1 has a substantially box shape with at least an open lower surface, and is mounted on the roller frame 2 via a guide portion 18.
Then, the loading tray 3 has an upper position G at which the upper part at least rises above the rail groove D and can lift the load A from the floor surface C,
It can be moved up and down to the lower position H where it can descend into the rail groove D and place the load A on the floor surface C. At the upper position G, at least the upper part protrudes above the roller frame 2, and at the lower position H, the roller frame 2
Is stored inside. Further, based on the link operation of the link device 5, the receiving table 3 can move back and forth with respect to the roller frame 2, and is guided by the guide portion 18 by this forward and backward movement, and moves to the upper position G and the lower position H. It can be moved up and down.

The receiving table 3 will be described in more detail with reference to FIG. 6 and FIGS. 1, 2, 3 and 4. As shown in FIG. 6, the receiving table 3 has a substantially box shape with the lower surface and the rear surface opened. That is, as shown in FIG. 4, the width of the left and right sides and the height of the roller frame 2 are substantially box-shaped with an open top as described above. In addition, sliding contact, internal fitting, and storage are set. The length of the receiving table 3 is set slightly shorter than that of the roller frame 2. In other words, as mentioned above,
The roller frame 2 is set to be storable in consideration of the space for the forward and backward movement and the space of the storage space 15 for the link device 5. The luggage A (see FIG. 7) is to be placed on the upper surface 19 of the loading tray 3 having such a shape. Guide portions 18 described below are cut out on both side surfaces 20 of the loading tray 3.

As shown in FIG. 2, FIG. 3, FIG. 4, and FIG.
The roller frame 2 is formed on the lower end edge of the roller frame 2, and is formed on the roller shaft 12 of each roller 4 on the roller frame 2 side.
In the illustrated example, a total of 14 guide portions 18 are formed, two on the left and right and seven on the left and right at intervals in the longitudinal direction.
Each of the guide portions 18 is formed as a notch inclined forward and rearward and lower and higher forward and rearward. Each is attached. Each guide portion 18 is placed and held on each of the right and left ends of the roller shaft 12 on the roller frame 2 side.

As described above, the loading tray 3 is placed on the roller shaft 12 and the roller frame 2 via the guides 18 on the side surfaces 20. And the receiving platform 3
Moves back and forth with respect to the roller frame 2,
The guide section 18 interposed therebetween allows the roller frame 2 to move up and down. First, as shown in FIG. 1, FIG. 2 and FIG. That is, when the load receiving table 3 moves forward with respect to the roller frame 2, the load receiving table 3 is held and supported by the roller shafts 12 and the roller frames 2 at the stopper portions 22 at the rear higher positions of the guide portions 18. And the receiving platform 3
Takes the lower position H. Next, as shown in FIG. 3 and FIG. That is, when the receiving table 3 moves backward with respect to the roller frame 2, the receiving table 3
At the front lower stopper portion 21 of each guide portion 18, it is held and supported by each roller shaft 12 and the roller frame 2, so that the receiving table 3 takes the upper position G.

The receiving table 3 at the lower position H is, as shown in FIG.
It is lowered and stored in the roller frame 2, and of course,
It descends in the rail groove D and below the floor surface C. So,
When the load A exists over the load receiving table 3 of the loader 1 and the floor C of the freight vehicle B or the like, the load A is placed on the floor C instead of the loader 1. Will be placed. On the other hand, as shown in the drawing, the upper part of the cargo receiving table 3 at the upper position G has an upper surface 19 or the like protruding above the roller frame 2, rising above the rail groove D and floating above the floor surface C. Thus, when the load A is present over the load receiving table 3 of the loader 1 and the floor C of the freight vehicle B or the like, the load A is not on the floor C but on the loader 1. Will be placed on the

When the load receiving table 3 is moved back and forth, it is moved up and down by being guided by the inclination of the guide portion 18, and is stopped at the stopper portion 21 or 22 to thereby control the upper position G or the lower position H. I take the. The forward / backward movement and the vertical movement of the receiving table 3 are realized by linking the link device 5 described below. The receiving table 3 is configured as described above.

<< Regarding Link Device 5 >> Next, the link device 5 will be described. The link device 5 of the loader 1
Storage space 15 formed at the rear end of roller frame 2
And performs a link operation based on an operation. That is, the link device 5 includes a crank portion 23 having a lower portion pivotally attached to the roller frame 2 with a horizontal axis, and in the illustrated example, one end portion is pivotally attached to the upper portion of the crank portion 23 with a horizontal axis. It has a link plate 24 whose part is pivotally attached to the rear part of the load receiving table 3 by a horizontal axis, and an insertion hole 27 formed in the crank part 23 and into which the tip part 26 of the operation lever 25 can be inserted. Then, the operation lever 2 inserted into the insertion hole 27
5 is in the vertical position J, the crank portion 23 and the link plate 24
Is completely stored in the storage space 15 of the roller frame 2, the link device 5 is completely stored in the roller frame 2, and the loading tray 3 takes the lower position H. When the operation lever 25 inserted into the insertion hole 27 is in the tilting posture K, at least the upper portions of the crank portion 23 and the link plate 24 protrude above the storage space 15 of the roller frame 2, and at least the upper portion of the link device 5 is At the same time as projecting above the roller frame 2, the receiving table 3 takes the upper position G.

With respect to such a link device 5, FIG.
This will be described in more detail with reference to FIGS. The crank portion 23 of the link device 5 is disposed at the rearmost end in a storage space 15 formed at the rear end of the roller frame 2. A first shaft 28, which is a horizontal axis on the left and right, is inserted through the lower portion of the crank portion 23,
The roller frame 2 is rotatably attached to a lower portion of the left and right side surfaces 10 of the roller frame 2 forming the storage space 15. On both left and right ends of the first shaft 28, rollers for rotating around the axis are provided. The link plate 24 as a connecting plate of the link device 5 is formed of a pair of left and right long plates. And both link boards 2
Reference numeral 4 denotes a common second shaft 29, which is a common left and right horizontal axis, and has a rear end, which is one end thereof, slidably in contact with the front upper portion of the crank portion 23 so as to be sandwiched from both sides. Have been. The second shaft 29 is inserted through the crank part 23. In the illustrated example, a front end portion, which is the other end portion of each of the link plates 24, is connected to a rear portion of the receiving table 3 through a stay 30, and a third shaft 31 which is a common left and right horizontal axis inserted therethrough.
And is rotatably mounted. As described above, in the illustrated example, the link plate 24 is interposed between the upper portion of the crank portion 23 and the rear portion of the loading tray 3, and the upper portion of the crank portion 23 and the rear portion of the loading tray 3 are connected to the side guide plate 33. Guide slot 3
It is pivotally connected via a third shaft 31 which is a horizontal axis guided at 4. The stay 30 has a front portion attached to and fixed to a rear portion of the loading tray 3 and a rear portion projecting rearward from the loading tray 3 in the form of a pair of left and right vertical long plates. The front ends of both link plates 24 are slidably contacted with both rear portions, and are rotatably mounted on a third shaft 31 inserted therethrough.

Note that the left and right ends of the first shaft 28 penetrating the crank portion 23 are respectively provided with running rollers 32.
Is mounted, and can run on the floor surface of the rail groove D via the opening 9 (see FIG. 5 (1)) formed in the bottom surface 6 of the roller frame 2 described above. In the figure, reference numeral 33 denotes a side guide plate, which is formed with a guide elongated hole 34 which is low at the front and tilted high at the rear. The side guide plates 33 are attached and fixed respectively to the inner surfaces of both side surfaces 10 forming the storage space 15 of the roller frame 2. , Is to be guided. At both left and right ends of the third shaft 31,
A roller for rotation about the axis is provided.

In the illustrated example, the insertion hole 27 of the link device 5 is formed through the central portion of the crank portion 23 at an angle perpendicular to the first shaft 28 and the second shaft 29. And for such an insertion hole 27,
The distal end 26 of the operation lever 25 for manual operation can be inserted. Step portions are formed before and after the distal end portion 26. The operation lever 25 has a function of elevating and lowering the load receiving table 3 and is also used for pushing the loader 1 forward as a whole and for pulling the loader 1 backward as a whole.

When the operation lever 25 inserted into the insertion hole 27 is in the vertical position J as shown in FIGS. 1, 2 and 4 (1), the load receiving table 3 is in the lower position H. I take the.
That is, when the operation lever 25 is in the vertical posture J, the crank part 23 and the link plate 24 of the link device 5 both take a horizontal posture, are completely stored in the storage space 15, and are substantially linear in the front-rear direction. It becomes an extended positional relationship, and becomes a link relationship that is separated back and forth about the second shaft 29. As a result, the loading tray 3 is pushed forward by the link plate 24 and the stay 30, and assumes a position moved forward with respect to the roller frame 2. Along with such a forward movement, the receiving table 3 is held against the roller shaft 12 and the roller frame 2 at the stopper portion 22 located at the rear higher position of the guide portion 18, so that the receiving table 3 takes the lower position H. .

On the other hand, as shown in FIGS. 3 and 4 (2) and the like, the operation lever 2 inserted into the insertion hole 27
In the case where 5 is the tilting posture K that has been pulled down rearward, the loading tray 3 takes the upper position G. That is, when the operation lever 25 is in the tilting posture K, the crank portion 23 and the link plate 24 of the link device 5 take the first shaft 28 as a fulcrum, take a vertical posture, and both upper portions protrude above the storage space 15. At the same time, approaching around the protruding second shaft 29,
Bending, overlapping positional relationship, and link relationship. As a result, the load receiving tray 3 is pulled rearward with respect to the roller frame 2 via the link plate 24 and the stay 30, and assumes a position where it has moved backward. Along with such retreating, the loading tray 3 is held against the roller shaft 12 and the roller frame 2 at the lower front stopper portion 21 of the guide portion 18, and the loading tray 3 assumes the upper position G. Link device 5
Is like this.

<< Operations and the Like >> The loader 1 of the present invention comprises:
The configuration is as described above. Then, it becomes as follows. Rail groove D is provided on freight vehicle B and warehouse floor C.
The loader 1 is disposed in each rail groove D, and can move the rail groove D back and forth, respectively (see FIG. 7). Having. The lower roller frame 2 has a substantially box shape with an open upper surface (see FIG. 5 and the like).
It is provided with a plurality of rollers 4 and can travel in the rail groove D of the floor surface C.
A link device 5 is provided (see FIG. 1, FIG. 2, FIG. 3, FIG. 4, etc.). The upper receiving tray 3 has a substantially box shape with an open lower surface (see FIG. 6 and the like), and is placed on the roller frame 2 via the guide portion 18 (see FIGS. 2, 3 and 4 and the like). ). The guide portion 18 has a shape inclined forward and backward, and is formed at the lower end edge of each of the left and right side surfaces 20 of the loading tray 3, and is formed in a left-right pair and a plurality of front and rear portions.
Each roller 4 on the roller frame 2 side is held on a roller shaft 12.

Therefore, when carrying out the cargo handling work of transporting the cargo A to and from the cargo vehicle B and the floor C of the warehouse, the loader 1 is arranged in the rail groove D below the cargo A, respectively.
Each is used as follows (see FIG. 7). First, the distal end portion 26 of the operation lever 25 is inserted into the insertion hole 27 of the crank portion 23 of the link device 5. And operation lever 2
When the vertical posture J is 5 (FIG. 1, FIG. 2, FIG. 4, (1)
In the illustrated example, the link portion 5 has a link relationship extended by the crank portion 23 and the link plate 24 based on the link operation, and the link device 5 is completely stored in the storage space 15 of the roller frame 2. Is done. And the receiving platform 3
Is pushed by the link plate 24 and the roller frame 2
, And is lowered to a lower position H in the rail groove D and below the floor C guided by the guide portion 18, and stored in the roller frame 2. Thus, the luggage A can be placed on the floor C.

On the other hand, when the operation lever 25 is tilted
(See FIGS. 3 and 4 (2) and the like), in the illustrated example, the crank portion 25 of the link device 5 and the link plate 24
Becomes a link relationship bent based on the link operation,
The upper part of the link device 5 projects above the storage space 15 of the roller frame 2. The loading tray 3 is pulled by the link plate 24 and is at a position where it is retracted rearward with respect to the roller frame 2, and is guided by the guide portion 18 so that an upper portion thereof protrudes above the roller frame 2. It takes position G, rises on rail groove D, and floats on floor C. Thus, the load A can be lifted from the floor C and transported.

Therefore, when carrying the cargo A to the cargo vehicle B or the floor C of the warehouse (see also FIG. 7 (1)), first, the cargo A is carried in from the outside and temporarily placed on the exit side of the floor C. The loader 1 with the load receiving table 3 at the lower position H is inserted into the rail groove D below the luggage A (see FIGS. 1, 2 and 4 (1)). Then, the load A is lifted on the upper surface 19 of the loading tray 3 by moving the operation lever 25 from the vertical attitude J to the tilting attitude K and raising the loading tray 3 from the lower position H to the upper position G (FIG. 3, FIG. (See FIG. 4 (2)). Thereafter, by moving the loader 1 forward and moving as it is (pushing the load A or pressing the operation lever 25), the load A is moved to the center side or the back side of the floor surface C. (See FIG. 7 (1)). And operation lever 2
5 is changed from the tilting posture K to the vertical posture J, and the receiving table 3 is moved to the upper position G.
, The luggage A is placed on the center side or the back side of the floor C from above the upper surface 19 of the loading tray 3 (see FIGS. 1, 2 and 4). (1) Refer to the figures etc.). Thus, the load A is carried in.

On the other hand, when unloading the cargo A from the cargo vehicle B or the floor C of the warehouse (see also FIG. 7 (1)), first, the cargo A is placed on the center side or the back side of the floor surface C. The loader 1 with the receiving stand 3 in the lower position H in the rail groove D below the loaded luggage A
(Refer to FIG. 1, FIG. 2, FIG. 4, (1) diagram, etc.).
Then, by moving the operation lever 25 from the vertical position J to the tilting position K and raising the load receiving table 3 from the lower position H to the upper position G, the luggage placed on the center side or the back side of the floor surface C is obtained. A is lifted on the upper surface 19 of the loading tray 3 (FIGS. 3 and 4).
(See FIG. 2 (b)). Thereafter, the loader 1 is moved backward and moved as it is (the load A).
Or pulling by pulling the operation lever 25) to carry the load A to the floor C exit side. Then, by moving the operation lever 25 from the tilted position K to the vertical position J and lowering the load receiving table 3 from the upper position G to the lower position H, the load A can be moved from the upper surface 19 of the previous load receiving table 3 to the floor C. Place once on the exit side (see FIGS. 1, 2 and 4 (1), etc.). Then, the package A is carried out.

<< Regarding compactness, etc. >>
The loader 1 has the following first and second configurations. First
In the loader 1, only when the load A is lifted and transported, the load receiving table 3 and the link device 5 are connected to the roller frame 2 only.
It protrudes upward (see FIGS. 3 and 4 (2) and the like), and the luggage A
When the lifter is not carried up or is not used, the load receiving platform 3 and the link device 5 keep the roller frame 2 having a substantially box shape.
(See FIGS. 1, 2 and 4 (1)). In other words, the shape of the loader 1 is always flat and compact. Therefore, for example, the loader 1 already arranged in the rail groove D can move under the load A newly placed next on the floor C (see FIG. 7B). ), The cargo handling operation by the forklift F (see FIG. 7A) is not interrupted.

<< Simplification of Configuration >> Secondly, this loader 1 has a substantially box-shaped roller frame 2 provided with rollers 4, a storage space 15 and the like, and a substantially box-shaped roller frame 2 provided with a guide portion 18. It has a simple configuration by using a combination of the receiving table 3 and the link device 5 having the crank portion 23, the link plate 24, the insertion hole 27, and the like.

[0039]

<< Characteristics of the present invention >> As described above, the loader according to the present invention has the respective guides on the substantially box-shaped load receiving table side on the respective roller shafts on the substantially frame-shaped roller frame side. A link device is provided in the storage space formed in the roller frame for holding and placing the unit, and for moving the load receiving table back and forth with respect to the roller frame, and ascending and descending. Then, the link device is in a positional relationship in which the link device projects or is completely stored with respect to the roller frame. , The following effects are exhibited.

<< First Effect >> First, the shape is made flat and compact. That is, in this loader, a storage space is formed at the rear end of a substantially box-shaped roller frame having an open upper surface, and a link device is disposed in the storage space. The link device is configured such that the lower part of the crank portion is pivotally attached to the roller frame, and when the receiving table is placed in the lower position and stored in the roller frame, it is completely stored in the storage space of the roller frame. In other words, like the above-mentioned conventional loader,
The link device and its storage part do not always protrude greatly upward at all times. With this loader, only when the load is lifted and carried, the load receiving cradle and the link device protrude above the roller frame to lift the load. When not in use or when not in use, the receiving table and the link device are stored in a roller frame or a rail groove having a substantially box shape.

As described above, the loader is always flat and compact in shape. Thus, this loader comprises: a. Workers during loading and unloading work do not trip, and safety is improved. b. Therefore, it is not necessary to pull out, remove, and separately store the loader from the rail groove on the floor surface during and after the cargo handling work, and accordingly, the work is speeded up and the working efficiency is improved. c. The danger of damage or breakage due to dropping of the loader, which was pointed out during the pulling, removing, and storing operations, is also eliminated. d. The storage location of the loader when not in use can be in the rail groove, and there is no problem with the storage location. In particular, it is good to turn it over and store it in the rail groove. e. Since the loader does not need to be stored on the floor of the freight vehicle or the warehouse, the load / storage capacity of the load increases, and the load efficiency improves. f. In particular, in the case of a van type vehicle as a freight vehicle, the risk of the loader being damaged or damaged due to contact with a pallet (load) when loading with a forklift or the like is eliminated. Further, in addition to the restriction from above due to the ceiling (rear opening surface) of the van type car, the shape of the loader does not restrict the load capacity of the load from below, and the load capacity of the load increases accordingly. g. Further, since the loader can pass under the load placed on the floor, the loading operation by the forklift is not interrupted, the loading operation is continuous, and the work efficiency is improved from this aspect.

<< Second Effect >> Secondly, the configuration is simplified and simplified. In other words, this loader includes a substantially box-shaped roller frame having rollers, a storage space, and the like,
It has a configuration in which a substantially box-shaped receiving tray provided with a guide portion and a link device provided with a crank portion, a link plate, an insertion hole and the like are combined. That is, the mechanism for moving and lifting / lowering is simple and easy as compared with the above-described conventional loader and cargo handling device of this type. A. Lifting and lowering operation is smooth and stable; b. It is not damaged or broken by the local load of luggage, has excellent strength and durability, and c. Low maintenance and easy maintenance, d. Light weight and excellent in cost, e. Existing rail grooves in freight vehicles and warehouses can be used as they are, and this is also excellent in cost. As described above, the effects exhibited by the present invention are remarkable and large, for example, all the problems existing in this type of conventional example are solved.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an embodiment of a loader according to the present invention, and shows a case where a loading tray is at a lower position.

FIG. 2 is a partially cutaway side view for explaining the embodiment of the present invention, and shows a case where the loading tray is at a lower position.

FIG. 3 is a partially cutaway side view for explaining the embodiment of the present invention, and shows a case where the loading tray is at an upper position;

FIG. 4 is a front sectional view for explaining the embodiment of the present invention, and FIG.
(2) The figure shows a case where the receiving table is at the upper position.

5A and 5B are views for explaining the embodiment of the present invention, showing a roller frame, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

6A and 6B are views for explaining an embodiment of the present invention, showing a loading tray, wherein FIG. 6A is a plan view and FIG. 6B is a side view.

FIGS. 7A and 7B are explanatory views of an embodiment of the present invention, in which FIG. 1A is a side view showing a cargo handling step in a freight vehicle, and FIG. FIG. 3 (3) is a plan view of a rail groove or the like on a floor surface,
(4) The figure is a front sectional view of the rail groove on the floor surface.

[Explanation of Signs] 1 Loader 2 Roller frame 3 Loading table 4 Roller 5 Link device 12 Roller shaft 15 Storage space 18 Guide part 20 Side surface 23 Crank part 24 Link plate 25 Operation lever 26 Tip part 27 Insertion hole 28 First shaft (shaft) ) 29 2nd shaft (axis) 31 3rd shaft (axis) A Luggage B Cargo vehicle C Floor surface D Rail groove G Upper position H Lower position J Vertical posture K Tilt posture

Claims (3)

[Claims] 1. A loader capable of moving a rail groove formed in front and rear parallel with respect to a floor surface of a cargo vehicle or a warehouse on which cargo is placed, comprising: a lower roller frame and an upper cargo receiving stand. The roller frame includes a plurality of rollers, is capable of traveling in the rail groove, is provided with a link device, and the load receiving table is mounted on the roller frame via a guide portion, An upper position where at least an upper part is raised on the rail groove and the load can be lifted from the floor surface, and a lower position where the load can be lowered into the rail groove and the load can be placed on the floor surface. The guide unit has a shape inclined forward and backward, and the link device is disposed in a storage space formed at a rear end of the roller frame, and performs a link operation based on an operation. The receiving platform is Based on the link operation of the link device, the link device can move forward and backward with respect to the roller frame, and can be moved up and down to the upper position and the lower position by being guided by the guide portion by the forward and backward movement. , Characterized by the loader. 2. The loader according to claim 1, wherein the roller frame has a substantially box shape with at least an upper surface opened, and the loading table has a substantially box shape with at least a lower surface opened. At least the upper portion protrudes above the roller frame at the position, and is accommodated in the roller frame at the lower position. The guide portions are formed at lower end edges of both left and right side surfaces of the loading tray, respectively, and form a left-right pair and Wherein the plurality of rollers are held on a roller shaft of each of the rollers on the roller frame side. 3. The loader according to claim 1, wherein the link device includes a crank portion having a lower portion pivotally attached to the roller frame with a horizontal axis, and one end portion pivotally attached to an upper portion of the crank portion with a horizontal axis. A link plate, the other end of which is pivotally attached to the rear part of the loading table by a horizontal axis, and an insertion hole formed in the crank part, into which a tip of an operation lever can be inserted. When the operation lever inserted into the insertion hole is in the vertical position, the crank portion and the link plate are completely stored in the storage space of the roller frame, and the loading tray takes the lower position. When the operation lever inserted into the roller is in a tilted posture, at least the upper part of the crank portion and the link plate protrudes above the storage space of the roller frame, and the loading tray takes the upper position. Loader to do.