JPH0511228Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an improvement of a pallet loader suitable for handling pallets attached to vehicles such as trucks and trailers.

b. Conventional technology Conventionally, cargo handling operations associated with vehicles such as trucks and trailers that have closed loading bays, such as refrigerators in refrigerated vehicles and freezers in refrigerated vehicles, have been carried out using cargo loading/unloading ports. There is only one location and it is not easy if the cargo to be handled is heavy or large.
Work efficiency was poor. For this reason, pallet loaders have been developed and improved with the aim of increasing the efficiency of pallet handling operations using the above-mentioned vehicles.

FIG. 8 is a partially cutaway view of a loading shed showing an application example of the conventional pallet loader installed in the vehicle.
In the figure, the loading shed 2 of the vehicle 1 includes a moving body 5 that moves within a plurality of groove-shaped rails 4 formed on the floor surface 3 from the cargo loading/unloading entrance at the rear to the back. is driven by a drive device (not shown).
Driven through the chain 6, the cargo 7 is placed on the moving body 5 together with the pallet A and moved. The moving body 5 consists of a cart and a pedestal, and the moving body 5
When the cargo 7 is placed on the pallet and moved, as the cart advances, the platform is raised from the platform by the platform lifting means installed in the moving body 5, and the top surface of the platform is raised above the floor surface above the bottom surface of the pallet. The moving body 5 moves accordingly.

FIG. 6 is an explanatory diagram conceptually showing the operation of this pedestal elevating means. , and rollers 102 for raising and lowering the pedestal, which are pivoted to a truck (not shown) so as to come into contact with this cam, and the rollers 102 are configured to move the truck forward (proceeding from the cargo loading/unloading entrance toward the back of the warehouse). ), the roller 102 is moved to the pedestal lifting cam 101.
Roll forward on the inclined surface 101a of the pedestal 10.
0 is raised to the position shown by the dashed line.

c Problems that the invention aims to solve By the way, when the weight of the cargo 7 increases, distortion occurs in the pallet A, which comes into contact with the floor surface 3 of the loading shed, making it difficult to transport the cargo smoothly. However, it was often hot. For this reason, various improvements have been made in the past to increase the lifting distance h of the pedestal 100, but the size of the pedestal elevating means with the above structure is limited due to its structure. .

That is, in order to increase the distance h, the slope of the slope 101a of the cam for raising and lowering the pedestal can be made steeper, or the relative moving distance l between the pedestal and the cart can be increased. In the former case, a large load will be applied to the drive means when the platform is raised, and in the latter case, there will be design constraints due to the various components arranged inside the platform. There was a problem.

This invention was created in view of the above problems.
The purpose is to provide a pallet loader that allows the lifting distance of the pedestal to be increased without increasing the relative movement distance between the pedestal and the cart or increasing the load on the drive means. be.

d Means for Solving the Problems The present invention for solving the above problems consists of a truck that runs within a groove-shaped rail formed on the floor of a loading shed, and a receiver mounted on the truck. a pedestal elevating and lowering cam that is fixed to the pedestal and has a gently ascending slope; and a pedestal elevating and lowering roller that is in contact with the sloping surface of the cam and is pivotally attached to the trolley. In the pallet loader, the platform is configured to move up and down with respect to the platform by rolling the roller on the inclined surface of the cam as the platform moves, and the top surface of the platform is configured to move up and down with respect to the platform. In the pallet loader, a steep slope is formed at the rear end of the cam in order to rapidly raise the pedestal until just before the cam reaches the floor surface.

e. Embodiment Hereinafter, an embodiment of the pallet loader according to the present invention will be described in detail with reference to the accompanying drawings.

First, to give an overview, this pallet loader consists of rails 4 with a concave cross section formed on the floor surface 3 from the entrance end to the back of the loading shed 2 shown in FIG.
A trolley 8 traveling above, a pedestal 9 mounted on the trolley 8, and a pedestal 9 at the front and rear of the trolley 8, respectively, for raising and lowering the cradle 9 relative to the trolley 8 as the trolley 8 travels. A pedestal elevating mechanism 10 is provided, and a first locking mechanism 11 is provided at the front of the cart 8 to restrain the cart 8 and the pedestal 9 and maintain the pedestal 9 in the raised state when carrying out cargo. , a restraining mechanism 12 for preventing the lock mechanism 11 from operating when loading cargo, and a second lock for restraining the trolley 8 and the pedestal 9 to prevent the pedestal 9 from rising when running idle. It is composed of a mechanism 13. The mechanisms other than the pedestal elevating mechanism 10 and the first locking mechanism 11 are constructed the same as those proposed in Utility Model Application No. 62-43604 by the present applicant.

The trolley 8 is constructed by connecting two sets of front and rear carts 8a and 8b via a connecting member 8c, and these carts 8a and 8b have left and right side walls formed by overlapping an outer plate 8d and an inner plate 8e. At the same time, a shaft 14 is installed between these side walls, and a running roller 15 is attached. This truck 8 has connecting members 17a attached to both front and rear ends by a connecting shaft 16,
By connecting the chain 6 to 17b and connecting this chain 6 to a drive device (not shown), the rail 4
It is designed to run back and forth on the top.

The pedestal 9 is a member having a generally U-shaped cross section and whose overall length is longer than that of the truck 8 by a predetermined length, and is placed slidably on the truck 8.

The pedestal elevating mechanism 10 includes a set of two pedestal elevating cams 18-1 and 18-2 fixed to the lower surface of the pedestal 9.
and each of the above-mentioned carts 8 so as to come into contact with these cams.
a, 8b and a pair of rollers 1 for lifting and lowering the pedestal
9. And these cams 1
On the lower surface side of 8-1 and 18-2, there is a slope 18a having a gentle upward slope, a steep slope 18b extending behind the slope 18a, and a flat surface extending in front of the slope 18a. 18c is formed,
As shown in FIGS. 3 to 5, as the rollers 19 roll on these surfaces, the pedestal 9 moves up and down with respect to the carriage 8.
The boundary 18d between the inclined surface 18a and the steeply inclined surface 18b is located just before the pedestal 9 rises and its upper surface 9a reaches the floor 3, as shown in FIG. It is located at a position where it passes through.

Further, each of the front and rear carts 8a, 8b is provided with a guide mechanism 5.
By coupling with the pedestal 9 through 0, the pedestal 9 is prevented from separating from the carts 8a, 8b. As shown in FIG. 1, this is a guide groove 8f formed in the outer plate 8d of the carts 8a, 8b following the inclination of the cam 18 for raising and lowering the pedestal, and a receiver that engages with the guide groove 8f while sliding therein. It consists of a guide pin 9a protruding from the stand 9. (Note that this mechanism 50 is not shown for the rear truck 8b.) Reference numeral 20 indicates a rear end of the pedestal 9 for locking the luggage 7 placed on the pedestal 9 rearward. This is a protrusion that protrudes from the part.

On the other hand, a pedestal 9 is provided at the longitudinal center of the bottom plate 21.
A sliding member 23 is protruded and loosely fitted into a guide member 22 having an H-shaped cross section and fixed to the lower surface of the holder. That is, the bottom plate 21 is directed to be movable in the vertical direction relative to the pedestal 9, and when the pedestal 9 is lowered,
Each of the traveling rollers 15 is in contact with the upper surface of the bottom plate 21 as shown in FIG.
1 rubs against the bottom surface of the rail 4, and when the pedestal 9 is raised, the running roller 15 protrudes from the rectangular opening 24 of the bottom plate 21 and comes into contact with the bottom surface of the rail 4.

Cam 18 for raising and lowering the pedestal provided on the rear truck 8b
A restraining mechanism 12 is provided in front of the carriage 8 to prevent the carriage 8 from moving forward relative to the pedestal 9. This restraining mechanism 12 includes a stopper A25 which is fixed to the lower surface of the pedestal 9 in front of the elevating cam 18, and a stopper A25 that is fixed to the lower surface of the pedestal 9 in front of the elevating cam 18.
Adjustment stopper 26 interposed in the space between
The adjustment stopper 26 and the operating lever 28 are mutually connected via the rod 27, and the stopper B29 is fixed between the inner plates 8e in front of the lifting roller 19.

That is, as shown in FIG. 7, when the truck 8 is moved forward (in the direction of the arrow in the figure) with the adjustment stopper 26 interposed below the space, the truck 8 moves past the stopper B29. The carriage 8 can only be moved to the position where it contacts the adjustment stopper 26, but when it is removed from below the space (indicated by the dashed line in the figure), the carriage 8
can be moved to a position where the stopper B29 comes into contact with the stopper A25.

The first lock mechanism 11 includes a pair of left and right engaging pins 30 inserted into a connecting member 17a connected to the front truck 8a, and a pair of left and right engaging pins 30 that are inserted into the connecting member 17a connected to the front truck 8a.
A pair of locking members 31 are fixed to both corners of the pedestal 9 to engage with the engaging portions 30a of the cradle 9. This locking member 31 is formed into a substantially U-shape by bending an elastic linear member with a rectangular cross section.
A tie portion 31b is formed to restrain the engaging portion 30a of the engaging pin 30 therein. Further, in order to smoothly engage the engaging portion 30a with the locking member 31, a guide 31c is formed that extends from the tethered portion 31b to the opening end. In addition, on the lower surface side of the connecting member 17,
A chain attachment putout 6a is connected by this engagement pin 30.

That is, when the cart 8 is moved forward relative to the pedestal 9, the engaging portion 30a comes into contact with the guide portion 31c and enters the inside of the locking member 31 while pushing the piece 31a outward. and is restrained in this position. In this restrained state, even if a force is applied to push the engaging portion 30a to the outside, it will be prevented from passing by the tied portion 31b; however, if the size exceeds a limit value, The engaging portion 30a is pushed out while expanding outward against the elastic force of the portion 31c, thereby releasing the restraint state.

The second lock mechanism 13 is composed of a spring plate 32 and a guide member 33 fixed to the lower surface of the pedestal 9, and a lock pin 34 fixed between the two connecting members 8c. cradle 9
When the guide member 33 is lowered, it engages with the spring plate 32 while coming into contact with the lower surface of the guide member 33, and is restrained by the elastic force of the spring plate 32. In addition,
When a force exceeding the restraint limit of the spring plate 32 is applied to the lock pin 34, the lock pin 34 escapes the restraint of the spring plate 32 and is pushed forward.

The operation of this embodiment will be explained below.

When loading the cargo 7 into the cargo storage 2, the moving body 5 is moved to the end of the loading/unloading entrance of the cargo storage 2 prior to loading the cargo 7. At this time, the pedestal lifting roller 19 moves the pedestal lifting cam 1 as shown in FIG.
8, and the upper surface 9a of the pedestal 9 is located lower than the floor surface FL.

Next, the pallet A carrying the cargo 7 is carried into the loading/unloading entrance end of the loading shed 2 using a cargo handling device such as a forklift, and is lowered to the position where the movable body 5 is placed. When the movable body 5 is advanced toward the back of the cargo storage 2 (in the direction indicated by the arrow in the figure) via the chain 6 by a drive device (not shown), the protrusion 20 at the rear end of the cradle 9 is moved. Since the receiver 9 cannot move after hitting the cargo 7, the lock pin 34 of the second lock mechanism 13 moves forward while sliding on the lower surface of the guide member 33 and escapes from the restraint by the spring plate 32.
Therefore, only the cart 8 runs, and the rollers 19 for raising and lowering the pedestal roll on the steeply inclined surface 18a of the cam 18 for raising and lowering the pedestal, and the upper surface 9a of the pedestal 9 is slightly below the floor surface 3. Raise it rapidly until it reaches . By the way, when the upper surface 9a of the pedestal reaches the floor surface 3, the roller 19 rolls on the inclined surface 18a beyond the boundary 18d of the cam, as shown in FIG. , the pedestal 9 can be raised to this position without applying a large load to the driving means.

Then, while the pedestal elevating roller 19 rolls on the inclined surface 18c of the pedestal elevating cam, the pedestal 9 floats the pallet A placed thereon above the floor surface 3. Further, as the trolley 8 moves, the pedestal lifting roller 19 reaches the flat surface 18c of the pedestal lifting cam, and at this position, the stopper B of the stopping mechanism 30
29 comes into contact with the adjustment stopper 26, and from then on the carriage 8 moves together with the pedestal 9. At this time, the engaging portion 30a of each engaging pin of the first locking mechanism 11 stops just before the opening 31c of the locking member 31, and the first locking mechanism 11 restrains the carriage 8 and the pedestal 9. It never happens. And trolley 8
As the cargo progresses, the cradle 9 carries the cargo 7 while lifting it to the back of the cargo storage 2.

After transporting the luggage 7 to a predetermined position, the cart 8 may be moved backward. Then, the pedestal lifting roller 1
9 rolls on the inclined surface 18a of the pedestal lifting cam 18 to lower the pedestal 9, and the lock pin 34 moves against the spring plate 3.
2 and is pressed against the lower surface of the guide member 33, the carriage 8 and the pedestal 9 are connected to the second lock mechanism 1.
3 will be restrained again. As a result, the baggage 7 comes into contact with the floor surface 3, and thereafter only the movable body 5 is pulled back, leaving the baggage 7 at the back of the cargo storage 2 and completing the loading.

Next, when carrying out the luggage 7, the restraining device 12
The adjustment stopper 26 is removed from below the space by rotating the operating lever 28 clockwise, and the movable body 5 is moved to the pallet A on which the cargo 7 is placed.
send it below. At this time, the cart 8 and the pedestal 9 are restrained by the second lock mechanism 13 and move as one. Therefore, the pedestal elevating cam 18 and the pedestal elevating roller 19 of the pedestal 9 do not move relative to each other at all, and the pedestal 9 enters the lower part of the cargo 7 without rising.

When the movable body 5 enters the lower part of the cargo 7 and the protrusion 20 at the rear end of the pedestal 9 hits the cargo 7 and the movement of the pedestal 9 is blocked, the lock pin 34 of the second lock mechanism 13 A force exceeding the restraint limit of the spring plate 32 acts on the spring plate 32, and the engagement of the lock pin 34 is released, and only the truck 8 moves forward. Further, when the cart 8 is advanced, the pedestal 9 rises and the cargo 7 is lifted off the floor 3, as in the case of carrying in the cargo described above.

In this case, the stopper B of the restraining mechanism 12 is
29 can be moved to a position where it passes below the adjustment stopper 26 and comes into contact with the stopper A25,
The pedestal lifting roller 18 reaches the front part of the flat surface 18a of the pedestal lifting cam, and the engaging portion 30a of the engaging pin 30 engages with each lock member 31 of the first locking mechanism 11. FIG. 9 shows this restrained state.

If the movable body 5 is pulled back in this state, the movable body 5 will move with the pedestal 9 raised.
This means that the cargo 7 can be transported to the loading/unloading entrance. Incidentally, since the pedestal 9 is restrained to the truck 8 by the first lock mechanism 11, there is no risk that the pedestal 9 will fall while the vehicle is traveling.

Then, when the pedestal 9 reaches the end of the rail 4 on the cargo storage entrance side and its movement is blocked, the engagement pin 3
A force exceeding the restraint limit of the locking member 31 acts on the engaging portion 30a of the
0a is pushed backwards. As a result, trolley 8
Then, the restraint on the pedestal 9 is released, and the pedestal lifting roller 19 rolls on the inclined surface 18a of the pedestal lifting cam to reach the steeply inclined surface 18b. Along with this, the pedestal 9 gradually descends, and the pallet A on which the cargo 7 is placed comes into contact with the floor surface 3. Thereafter, the cargo 7 will be carried out of the warehouse using the cargo handling device. Note that when the pedestal lifting roller 19 reaches the steeply inclined surface 18b, the pulling of the cart 8 by the driving means is stopped.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. For example, as shown in FIG. 11, a stepped portion 18d may be provided at the front end of the pedestal elevating cam 18, and the pedestal elevating roller 19 may be depressed thereto to restrain the pedestal 9. In that case, the first locking mechanism 11 becomes unnecessary.

Although the drive means for the trolley 8 is carried out via the chain 6 in this embodiment, it may generally be towed by a wire, and the loading shed 2 is not limited to vehicles, but can be used for warehouses, etc. Of course, it can be applied to any situation.

f. Effect of the invention According to the invention, while the pedestal is rising without load (until the top surface reaches the floor), the steeply inclined surface provided at the rear end of the pedestal elevating cam above,
The rollers for raising and lowering the pedestal can roll and raise the pedestal rapidly, so the pedestal can be raised rapidly without increasing the relative movement distance between the pedestal and the cart or increasing the load on the drive means. This makes it possible to increase the distance of lift.

[Brief explanation of the drawing]

Each drawing except FIG. 6 shows an embodiment of the pallet loader according to the present invention, in which FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a sectional view taken along line A-A shown in FIG. 1, and FIG. 5 to 5 are explanatory diagrams for explaining the operation of the pedestal lifting means provided on the pallet loader, respectively, FIG. 6 is an explanatory diagram for explaining the operation of the same means provided on the conventional pallet loader, and FIG. Figure 7 is a sectional view taken along the line B-B shown in Figure 1, Figure 8 is a partially cutaway perspective view showing how the pallet loader is used, and Figure 9 is a restrained state when the pedestal is raised when carrying out cargo. 10th longitudinal sectional view showing
The figure is a sectional view taken along line C-C shown in Figure 1.
FIG. 1 shows a modification of the first locking mechanism. 8... Cart, 9... Pedestal, 10... Pedestal elevating mechanism, 11... First lock mechanism, 12... Stopping mechanism, 13... Second lock mechanism, 18... Pedestal elevating mechanism. Cam, 18a... Inclined surface of the cam for raising and lowering the pedestal,
18b... Steep slope of the cam for raising and lowering the pedestal, 18c...
...Flat surface of the cam for raising and lowering the pedestal, 19...Roller for raising and lowering the pedestal.

Claims (1)

[Scope of utility model registration request] A truck that runs in a groove-shaped rail formed on the floor of a loading shed, a pedestal mounted on the pedestal, and a pedestal fixed to the pedestal and having a gently ascending slope. A pedestal elevating cam and a pedestal elevating roller abutting the sloping surface of the cam and pivotally attached to the cart, the roller being moved onto the sloping surface of the cam as the cart travels. In a pallet loader configured such that the pedestal moves up and down with respect to the cart by rolling the pedestal, in order to rapidly raise the pedestal until just before the top surface of the pedestal reaches the floor surface, A pallet loader characterized by forming a steeply sloped surface at the rear end of the cam.