JPS6142669B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for vertically lifting and lowering a side plate of a cargo bed in a truck.

The side plate for the truck load is commonly referred to as a fan, and the lower end of the side plate is generally pivoted to the side of the loading platform with a hinge so that it can rotate freely. However, when unloading or loading cargo on a narrow road, such as when the side plate is unloading or loading very close to the wall of a building, even if you try to lower it by rotating the side plate, it may get caught on the building wall. This causes the inconvenience of having to put it away. In order to eliminate this inconvenience, a system has been proposed in which the side plate is moved up and down vertically while remaining vertical, instead of being rotated as described above. In order to be able to do this easily under nearly no-load conditions, it has been proposed that the side plates are suspended from wires via pulleys, and the ends of the wires are connected to coiled springs. However, with this side plate lifting device, a relatively large pulley must be installed at the top of the side of the loading platform, which poses an obstacle to unloading and loading, and the wires are subject to repeated bending loads on the pulleys, making them susceptible to breakage. There is a drawback. Since the elastic force of the coiled spring changes as the lift of the further side plate changes, it is also difficult to vertically move the side plate over the entire lift in a substantially unloaded state.

The purpose of the present invention is to solve the above-mentioned problems, to make loading and unloading on narrow roads easier by making the side plates vertically movable, and to create a mechanism for vertically raising and lowering the side plates using wires and pulleys. By preventing the lifting and lowering mechanism from becoming a hindrance to loading and unloading or causing wire breakage, the side plate can be lifted and lowered with virtually no load. An object of the present invention is to provide a device for vertically lifting and lowering a side plate of a cargo bed in a truck.

A vertical lifting device for a side plate of a truck according to the present invention, which achieves the above object, has a side plate of the cargo platform that is movable in the vertical direction, one end of which is engaged with the side plate so that the side plate can be moved vertically together with the side plate, and another The present invention is characterized in that a rod is provided whose end is engaged with a horizontal guide below the loading platform and is movable in the horizontal direction, and the intermediate portion of the rod is interlocked and connected to a spring fixed below the loading platform via a link mechanism. It is something.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 is a front view of a vertical lifting device for a side plate of a loading platform according to an embodiment of the present invention, FIG. 2 is a side view seen from the right side in FIG. 1, and FIG. 3 is a cross section taken along the line A-A in FIG. 1. 4 are diagrams showing the same device in skeleton form.

In the figure, reference numeral 1 denotes a loading platform of a truck, and a guide rail 2 is fixed to the underside of the loading platform 1 with bolts 3. The guide rail 2 is composed of an upper frame 2u, a lower frame 2d, and fixed plates 2s fixed to both sides thereof, and a horizontal guide groove 2g is formed between the upper frame 2u and the lower frame 2d. ing. This guide groove 2
In g, a guide roller 5 rotatably provided at the upper end of a pair of left and right rods 4, 4 is installed in a guide groove 2g.
It is fitted so that it can move freely in the horizontal direction along the
Also, guide pins 6, 6 are attached to the lower ends of the rods 4, 4.
is fixed so that it protrudes laterally. The guide pins 6, 6 at the lower ends of the rods 4, 4 are engaged by fitting into engagement holes 8a of an arm 8 provided at the lower end of the side plate 7 of the truck bed. Side plate 7
As shown in FIG. 5, a guide roller 14 is provided at the upper end via an arm 13, and this guide roller 14 is guided by a guide groove 15g provided vertically in a column 15 erected at the corner of the loading platform. They fit together as shown. Therefore, the side plate 7 has the guide groove 15
It is now possible to move vertically along g. In addition, the guide groove 15g is bent inward at the upper end of the loading platform and then extended upwards with a different phase, so that the side plate 7 is moved toward the inner side of the loading platform at the uppermost end as shown by the chain line, and is further raised upward to engage. It is made so that it can be stopped. Further, for this purpose, the engagement hole 8a on the lower end side is formed into a long hole so that it can be moved laterally. Further, the lock hole 2l of the guide rail 2 is for locking the upper end of the rod 4 to lock the side plate 7 in the upper position.

The ends of a pair of links 9, 9 are rotatably connected to the intermediate portions of the rods 4, 4 in the longitudinal direction via pins 10, 10, and the other ends of the links 9, 9 are connected to the guide groove 2g. It is rotatably supported on a pin 11 fixed to the right end of. Therefore, when the side plate 7 is vertically moved up and down along the guide groove 15g of the support column 15, the lower ends of the rods 4, 4 are vertically moved up and down via the guide pins 6, 6, and the rods 4, 4 are The upper end of the guide roller 5 moves along the guide groove 2g in the horizontal direction. At this time, the rods 4, 4 are connected to the pins 10, 10 in the middle.
The link 9 swings using the pin 11 as a fulcrum to change the inclination angle, and the link 9 swings using the pin 11 as a fulcrum.

In the above embodiment, the lengths of the rod 4 and the link 9 are set in a 2:1 relationship, and the pin 1
Since the position of 0 is set at the center that is half the length of the rod 4, the rods 4, 4 theoretically change from the horizontal state along the guide groove 2g to the vertical state perpendicular to this during the above-mentioned movement. It is designed to allow displacement up to.

On the other hand, plate-shaped frames 12, 12 are fixed to both sides of the lower frame 2d of the guide rail 2 by welding or the like, and plates 12a, 12 are attached to the end faces thereof.
It is connected and fixed by 2a. Plate frame 1
A spring housing 17 into which a spring 16 is inserted is fixed to the second plate 12a. A rod 18 is provided so as to pass through the center of the spring 16, and a nut 19 is attached to one end of the rod 18.
The end face of the spring 16 is locked by a seat plate 20 fixed by a seat plate 20, and the other end of the rod 18 is rotatably connected to links 21, 21 via a pin 22. The lower ends of the links 21, 21 are plate-shaped frames 1
2 and 12 by pins 23 so as to be rotatable.

Also, links 24, 24 are rotatably connected to the intermediate portions of the links 9, 9 in the length direction via pins 25, 25, and the other ends of the links 24 are connected to the plate frames 12, 12. The ends of the links 26, 26 are pivotally supported via a pin 27, and are rotatably connected via a pin 28. Furthermore, the links 26, 26 and the links 21, 21 that engage with the spring 16 described above are rotatably connected by a link 29 and pins 30, 31.

32 is an auxiliary spring, and the stopper 33 that engages with this auxiliary spring 32 is inserted into the guide groove 2g.
I try to let it come inward. This auxiliary spring 32 is designed to apply an auxiliary elastic force via a stopper 33 when the guide roller 5 at the upper end of the rods 4, 4 moves to the right end.

In the apparatus configured as described above, when the operator vertically moves the side plate 7 up and down along the guide groove 15g, the side plate 7 has the rod 4 and the links 9, 24,
Since the elastic force of the spring 16 acts as a reaction force of the downward gravity of the side plate 7 through the link mechanisms of 26, 29, and 21, it is possible to move up and down extremely easily without applying a large force. Side plate 7
In the lifting and lowering operation, the elastic force of the spring 16 itself is compressed and becomes larger when the lifting height of the side plate 7 becomes downward, and expands and becomes smaller when the lifting height of the side plate 7 becomes upward. The pins 6, 6 at the lower ends of the rods 4, 4 are adjusted so that the force is approximately constant regardless of the lifting height of the side plate 7. Therefore, there is no imbalance such that the side plate 7 is heavy when moved to the upper position and becomes lighter when moved to the lower position, and the side plate can be raised and lowered with almost no load over the entire lifting range.

To explain more specifically with reference to the skeleton diagram in FIG.
At position 0a, a weight of 2W is applied.
This weight acts on the link 26 via the links 9 and 24, but the force acting on the link 26 increases as the angle θ that the link 9 makes with the guide groove 2g increases, that is, the lift of the side plate 7 decreases. It will decrease as time goes on. On the other hand, as the angle θ increases, the link 26 is displaced in the direction of expanding (compressing in the case of FIG. 1) the spring 16, so the elastic force of the spring 16 increases. Therefore, in order to balance the force of the link 26, which decreases as the angle θ increases, with the elastic force of the spring 16, which increases,
It is necessary to reduce the elastic force of the spring and transmit it between the link 26 and the spring 16. The links 29 and 21 are connected for this purpose, and the elastic force of the spring 16 is controlled and transmitted to the link 26. Such control can be optimally adjusted by appropriately selecting the lengths and positions of the links 21 and 29.

Figure 6 shows the distance between pins 27 and 30 of link 26 of 70 mm, the distance between pins 30 and 31 of link 29 of 90 mm, the distance between pins 23 and 31 of link 21 of 100 mm, and the distance between pins 23 and 27 of the above-mentioned device. Deflection amount of spring 16 and pin 3 when the gap is set to 98mm
1 shows the relationship with the force applied to 1. As shown in this figure, it is preferable that the relationship between the amount of deflection of the spring and the force changes approximately linearly.

Figure 7 shows the relationship between the lifting height of the side plate 7 obtained by the link set in Figure 6 and the reaction force applied to the pin 6 at the lower end of the rod 4. The reaction force remains almost constant over time. In FIG. 7, the curve indicated by the broken line A is the curve when the elastic force of the auxiliary spring 32 shown in FIG. This is supplemented by force, so that the reaction force is substantially uniform throughout. Therefore, if such an auxiliary spring is used, it is possible to make the lifting operation almost completely unloaded over the entire range of the lift height of the side plate, which is a more preferable configuration.

As described above, the vertical lifting device for the side plate of the loading platform according to the present invention is provided with the side plate of the loading platform so as to be movable in the vertical direction, one end of which is engaged with the side plate so as to be movable in the vertical direction together with the side plate, and the other end is A rod is provided that can move freely in the horizontal direction by engaging with a horizontal guide below the loading platform, and the middle part of the rod is interlocked and connected to a spring fixed below the loading platform via a link mechanism, so that the side plate can be moved freely. Vertical movement makes loading and unloading on narrow roads easier as the side plates do not become an obstacle, and the use of a link mechanism eliminates the need for pulleys and wires, allowing the lifting mechanism itself to be moved below the loading platform. Because of their positioning, they do not become an obstacle to loading or unloading, or they do not become inoperable due to broken wires, and the side panels can be raised and lowered with virtually no load. do.

[Brief explanation of the drawing]

FIG. 1 is a front view of a vertical lifting device for a loading platform side plate according to an embodiment of the present invention, FIG. 2 is a side view seen from the right side in FIG. 1, and FIG. 3 is a cross section taken along the line A-A in FIG. 1. Fig. 4 is a schematic diagram showing the device in skeleton form, Fig. 5 is a side view of the side plate, Fig. 6 is a relation between the amount of deflection of the spring and the force applied to the pin 31, and Fig. 7 is a diagram of the side plate. FIG. 6 is a diagram showing the relationship between the lift height and the reaction force applied to the guide pin 6. FIG. 1... Loading platform, 2... Guide rail, 2g... Guide groove, 4... Rod, 5... Guide roller, 6
... Guide pin, 7 ... Side plate, 8a ... Engagement hole,
9, 21, 24, 26, 29...link, 11...
...Pin, 12...Plate frame, 15g...Guide groove, 16...Spring, 18...Rod.

Claims (1)

[Claims] 1. A side plate of the loading platform is provided to be movable in the vertical direction, one end is engaged with the side plate to make it movable vertically together with the side plate, and the other end is engaged with a horizontal guide below the loading platform to move horizontally. 1. A vertical lifting device for a side plate of a loading platform in a truck, characterized in that a movable rod is provided, and the intermediate portion of the rod is operatively connected to a spring fixed below the loading platform via a link mechanism.