JPS5856935A - Cargo elevator for cargo-handling truck - Google Patents

Abstract

PURPOSE:To simplify the overall structure and the operation mode of each link mechanism by performing the revolution and elevation of a bed using each independent hydroulic cylinder. CONSTITUTION:A parallelogram link mechanism is formed by rotatively supporting the base ends of an expansion link 4 and a hydraulic cylinder 5 on the right place of the chassis at the lower part of the rear of a bed 1 and their other ends on the base end of a bed 7. Besides, the chassis is provided with an elevating hydraulic cylinder 10 that swings the link 4 and the cylinder 5 round the chassis side rotative point of the link 4 or the cylinder 5. As a result, the revolution and elevation of the bed 7 are performed independently using the hydraulic cylinder 5 and the elevating hydraulic cylinder 10.

Description

[Detailed Description of the Invention] The present invention relates to a loading/unloading device for a cargo handling vehicle, which allows a loading/unloading platform to be raised and lowered between the ground and the loading platform floor while maintaining the horizontal position during loading/unloading work, and after the work is completed. This refers to a load lifting device that stores the loading platform below the loading platform, so the rear door of the loading platform can be opened and closed freely, and is particularly suitable for cargo handling vehicles with double-opening rear doors such as refrigerated vehicles. be.

These types of loading/unloading devices have been proposed in the past, but in the case of these devices, all operations such as rotation and lifting/lowering of the loading platform are performed by a single fluid pressure cylinder. As a result, the structure of the attached link mechanisms and their operation becomes extremely complicated, which poses problems in terms of durability and manufacturing.

This invention has been made in view of the above points, and is configured so that the rotation and elevation of the loading platform are performed by independent hydraulic cylinders, thereby simplifying the overall structure and allowing the operation of each link mechanism. Simplify the aspect and locally #I1
The purpose of the present invention is to provide a load lifting and lowering device that does not apply excessive force, is easy to manufacture, and is highly durable.

Embodiments of the present invention will be described below with reference to the drawings.

(1) is a loading platform -2- of a cargo handling vehicle equipped with a rear door (2), and a pair of brackets 1 to (3) are set at a predetermined interval in the lateral direction at appropriate positions on the vehicle body at the lower rear of this loading platform (1). () and fix it to both brackets 1 (3) respectively by #1
The telescoping link (1) is placed inward, and the telescoping link (1) is placed inward, and the telescoping link (/I) is placed on both sides. i-! The end pivots are connected by a support 1+ll (6) so that the telescopic link (/l) swings when the support shaft (6) rotates. .

Then, the telescopic link <4
) and the tip of the fluid pressure cylinder (5) are pivoted and spaced apart from each other by 11 degrees, forming a parallel link 1 structure.

In addition, the telescopic link (/I) is a flat container that can be placed on the cargo receiving platform (7) in a folded state in an inverted state.
',>-J It consists of a link body (/la) that extends to the right on two sides, and an auxiliary rod (/11) that can freely protrude from this main body (4a)/), and the loading platform (7) is parallel to the ground. It is the longest when held in the position, and the R is short when it is approximately equal to the 111-folded cargo tray/stand-3- (7) length.
A stopper (4G) (4d) is provided on the auxiliary rod (4b), and the tip of the auxiliary phase ib) is bent upward at a substantially right angle in the direction G.

(8) is a fixed shaft fixedly installed between the brackets + and (3) parallel to the support shaft (6) and spaced apart in front thereof;
A pair of support pieces (9) are provided projecting from the center of the fixed shaft (8) with a gap iQ therebetween, and the main body of the lifting hydraulic cylinder (10) is pivotally mounted between both support pieces (9). In addition, the support shaft (6
) A pair of support pieces (11) are provided with a gap in the center of the support pieces (11), and a fluid pressure cylinder (10) is provided between the support pieces (11).
) is pivoted at the tip of the rod, and the support shaft (6) is rotated by the expansion and contraction movement of the cylinder (10), swinging the expansion and contraction link (4) up and down.

Next, the mode of operation of the load lifting device having the above structure will be explained.

In Fig. 1, the solid line portion indicates the state where the unfolded loading platform (7) is at its lowest position, and in this state, the fluid pressure cylinder (10
), the support shaft (6)-4- rotates and moves the telescoping link (4) and the hydraulic cylinder (5) upwards around the pivot point on the vehicle body side of the telescoping link (/l). Hold the loading platform (7) horizontally and raise it to a height that is flush with the floor of the loading platform (1). Now, in its uppermost position, if the hydraulic cylinder (10) is contracted, it will hold the cargo platform (7) horizontally and touch the ground.In this way, the cargo can be Loading and unloading work is carried out by lifting and lowering the loading platform (7).1! do.

After the loading and unloading work is completed, to store the loading platform (7), as shown in Figures 2 and 3, place it in the lowest position a3 and fold the loading platform (7) in two. Furthermore, the flow (*) E cylinder (5) is extended until the tip pivot point of A passes the dead point (on the extension of the 0"1 line connecting the base pivot point and the tip pivot point of the telescopic link (4)). Then the loading platform (
7) is lowered and exceeds the dead point 1~, and conversely, if the fluid pressure cylinder (5) is contracted, the loading platform (7)
rotates upward around the base end pivot point of the telescoping link (/I) and abuts against the main body -5- (-18) of the telescoping link (4).

Here, the fluid pressure cylinder (5) is further contracted continuously.
When the telescopic link (4) begins to contract, the loading platform (7)
slides upward along the body (4a) of the telescopic link (4) and becomes parallel to the telescopic link (4).

Therefore, if the lifting hydraulic cylinder (10) is then extended, the contracted telescopic link (4) and the fluid pressure cylinder (5) will move upwards about the pivot point of the telescopic link (4) on the vehicle body side. The load receiving platform (7) is moved to the position shown by the dashed line at the lower rear of the loading platform (1) in FIG. 1 and stored.

Therefore, even when the loading platform (7>) is stored, the rear door (2) of the loading platform can be freely opened and closed.

As explained above, the load lifting device of the present invention pivots the base ends of the telescoping link and the hydraulic cylinder at appropriate positions on the vehicle body below the rear of the loading platform, and pivots their other ends to the base end of the loading platform. The vehicle body is equipped with 14 hydraulic cylinders for lifting and lowering, supporting the cylinder to form a parallel link mechanism, and swinging them around the pivot skin +:;i on the vehicle body side of the link or cylinder. Since the rotating operation and storage/lowering operation of the cradle are made to be performed by separate hydraulic cylinders, the hydraulic cylinders of the telescopic link forming the parallel link mechanism cannot be swung up and down. ,
Or Δ to pure operation of f111, such as expansion and contraction movement.
4/4 construction is very simple and requires only 4 parts, and IYJ construction is easy, as it achieves the following objectives: loading and unloading work of JF goods, storing the cradle, etc. Cost 1- is also cheap and there are few failures.
7-11 cradle 1;1. ``It is stored in the lower part of the rear of the IWi stand. 1) It is convenient to freely open and close the rear door when storing it.
If you set it to lI, the storage space will be small and C will be played.
Efforts such as f8 can be easily achieved by installing equipment on the role wheels.

[Brief explanation of drawings]

The drawings show embodiments of the present invention. 1. Figure 1 is an overall schematic front view, Figures 2 and 3 are explanatory views of the storage mode of the loading platform (7), and Figures 4-7. = The figure is a perspective view with the loading platform (7) and lifting hydraulic cylinder (10) removed. 1... Loading platform, 2... Rear door, 3... To bracket 1, 4... Telescopic link, 5... Fluid pressure cylinder, 6... Support shaft, 7... Loading platform, 8・
...Fixed shaft, 9.11...Support piece, 10...Fluid pressure cylinder for lifting/lowering. -8- Procedural amendment (formality) 1. Display of the case 1981 Patent Application No. 1553
11 No. 2, Title of the invention Load lifting device for cargo handling vehicles 3, Relationship with each case to be amended Patent Representative of applicant: Tsuneji Tamagawa 4, Agent 〒650

Claims (2)

[Claims] (1) One end of a telescoping link and a fluid pressure cylinder are respectively pivoted to appropriate positions on the vehicle body below the rear of the loading platform, and their (17) ends are pivoted to the base end of the loading platform to form a parallel link mechanism. Also, a cargo lifting device for a cargo handling vehicle, characterized in that the vehicle body is equipped with a lifting cylinder that swings the links or cylinders around a pivot point on the vehicle body side. (2) The cargo lifting device for a cargo handling vehicle according to claim 1, wherein the cargo receiving platform is foldable into two in the front and back direction.