JPH0143648B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding loading truck,
The purpose is to allow the loading platform itself to act as a footboard when loading and unloading cargo onto the loading platform.

Conventionally, in order to enable one truck to be used for multiple purposes, a truck has already been proposed in which the loading platform itself is tilted backwards so that it doubles as a footboard. In the above conventional example, a fixed table is supported so as to be able to rise and fall freely above the rear wheels of the truck frame via a hinge in the vehicle width direction, and a movable table can be slid back and forth on guide rails on both left and right edges of the fixed table. A hydraulic cylinder is disposed between the fixed table and the movable table for sliding the movable table back and forth, and another hydraulic cylinder is disposed between the fixed table and the frame for tilting the fixed table. There is.

(Problems to be Solved by the Present Invention) However, in this case, two types of hydraulic cylinders are essential, one for longitudinal sliding and one for tilting, making the structure complex and expensive. The need to provide guide rails for the movable table separately from the frame also increases costs.

(Means for Solving the Problems) The present invention provides a front frame supported by a front wheel and a rear wheel, a rear frame pivotally connected to the rear end of the front frame via a hinge, and a rear frame disposed on the top of both frames. The lower surface of the loading platform is integrally provided with a vertical joist that extends back and forth and is slidably supported by the rear frame, and the rear frame lands on the ground when the loading platform is tilted. In a sliding platform truck equipped with supporting legs, the rear frame and the vertical joist are connected by a hydraulic cylinder that is extendable back and forth, and a joist stopper is provided for regulating the amount by which the platform slides rearward by the hydraulic cylinder. An arm mechanism is provided on the vertical joist and linked to the vertical root stopper to tilt the loading platform, and the arm mechanism includes a support shaft in the vehicle width direction supported by both frames, and a support shaft that rotates around the support shaft. A movable arm, a roller supported at the tip of the arm and abutting against the joist stopper, and an arm stopper for regulating the amount of rotation of the arm, and the arm rotates in a direction to tilt the loading platform. By providing a spring member that suppresses the rotational force during the loading, the hydraulic cylinder for tilting the loading platform can be omitted.This will be explained next with reference to the drawings.

(Example) First diagram showing the left side of a truck to which the present invention is applied.
In the figure, a cabin 4 is mounted on the front part of a front frame 3 supported by front wheels 1 and rear wheels 2, and a cabin 4 is mounted on the rear end of the front frame 3 in the vehicle width direction (perpendicular to the plane of the paper in Figure 1). A rear frame 6 is pivotally attached via a hinge 5 (hidden by a spring receiver 5') in the direction (direction) so as to be able to rise and fall freely. The front frame 3 is a ladder-shaped frame similar to the conventional one, and the pair of left and right side members 3a are press-molded into a U-shape that opens toward the center of the vehicle body as shown in Figure 4, and are spaced apart in the longitudinal direction. The left and right side members 3a form a ladder structure via a plurality of cross members 3b. The rear frame 6 also has a ladder-shaped structure similar to the front frame 3, and the side members 6a are U-shaped pressed parts that open toward the center of the vehicle body as shown in Figure 3, and are integrated by two front and rear cross members 6b. It has become The hinge 5 has a structure in which a hinge bracket (not shown) provided on the front frame 3 and a hinge bracket provided on the rear frame 6 are connected by a hinge pin. A rail 7 made of a thick steel band plate that also serves as reinforcement is welded to the upper surface of the side member 3a, and this rail 7 has a plurality of holes (not shown) for letting out the rivets protruding from the upper surface of the side member 3a. has. Note that C16 is a support leg provided at the rear end of the rear frame 6, and as described later, the hinge 5
This is for supporting the rear frame 6 by landing on the ground 26 when the rear frame 6 rotates about the axis.

Two front and rear cross members 6b in the rear frame 6
(Fig. 3) has support stands 9 on the upper surface of both left and right ends, respectively.
A support shaft 10 extending in the vehicle width direction (horizontal direction in FIG. 3) protrudes from the upper outer surface of the support base 9, and a steel roller 11 is rotatably supported at the tip of the support shaft 10. , the roller 11 is fitted into a groove 13 in a vertical joist 12 of a channel-made platform. The vertical joist 12 is a strength member that is fixed to the lower surface of the loading platform 14 and extends in the front-rear direction, and is located directly above the side member 6a, and the groove 13 has a U-shaped cross section that opens toward the center of the vehicle. Therefore, the left and right vertical joists 12 of the loading platform 14 are supported on the rear frame 6 via two rollers 11 at the front and rear so as to be slidable in the front and rear directions.
In order to prevent the loading platform 14 from shifting laterally with respect to the rear frame 6, guides 15 are welded to the outer surfaces of the left and right side members 6a. The illustrated guide 15 is a channel, and the lower half is the side member 6.
a, and the upper half is slightly attached to the vertical joist 12.
They are facing each other with a gap between them.

An H-shaped arm 18 is supported on the front frame 3 in front of the rear wheel 2 via a support shaft 17 in the vehicle width direction that constitutes the arm mechanism of the present invention, and is movable up and down.
A support shaft 19 protrudes in the vehicle width direction from the outer surface of the tip of the left and right arms 18, and a steel roller 20 is rotatably supported at the tip of the support shaft 19, and this roller 20 is fitted into the groove 13 of the vertical joist 12 of the platform. It matches. A joist stopper 21 that closes the groove 13 is welded to the front end of the vertical joist 12 of the loading platform.
is opposed to the roller 20 in the groove 13, and plays the role of colliding with the roller 20 and pulling up the arm 18, which is in the forward upward position, in the direction of arrow A when the loading platform 14 is horizontally retreated a certain amount by a hydraulic cylinder 28, which will be described later. fulfill. Arm stoppers 22 are provided inside the left and right side members 3a to regulate the storage position of the arms 18.
An arm stopper 23 for regulating the standing posture of the arm 18 is fixed thereto. When the arm 18 is in the retracted position where it abuts against the stopper 22, the roller 20 and the two rollers 11 at the front and rear are connected to the loading platform vertical joist 1.
2 can be supported slightly above the rail 7,
The position of the stopper 22 is determined. That is, while the loading platform 14 is moved back a certain amount from the position indicated by the solid line in FIG.
2 is supported by the rollers 20, and at the same time, the two rollers 11 provided at the front and rear of the rear frame 6 are fitted into the grooves 13 of the vertical joists 12, so that the vertical joists 12 are connected to the rails 7. Designed to avoid sliding friction. When the arm 18 is in abutment with the stopper 23, the roller 20 supports the vertical joist 12 at the stopper 21, and the roller 20 supports the vertical joist 12 and the loading platform 14.
is inclined as shown by the two-dot chain line, the rear gate 24 at the rear end of the loading platform 14 is opened in the direction of arrow B using the hinge 25 as a fulcrum, and the stopper 23 is positioned so that the tip of the rear gate 24 can be placed on the ground 26. and the length of the arm 18 is determined. Reference numeral 27 denotes a tension spring (spring member), which is disposed between the arm 18 and the front frame 3 in front of it. The arm 18 is biased in a direction (opposite to the direction of arrow A) that suppresses the rotational force. By providing this tension spring 27, even if a hydraulic cylinder 28, which will be described next, suddenly drives the loading platform 14 backward due to an erroneous operation, the arm 18 will gently tilt the loading platform 14 due to the spring force. Also roller 2
0 and the vertical joist 12 are increased, and it is possible to prevent rattling noise when the loading platform 14 is moved forward.

The hydraulic cylinder 28 shown in FIG. 2 has its rear end connected to a bracket 29 provided on the rear cross member 6b of the rear frame 6, and the front end of the rod 30 connected to the loading platform
A control lever 32 for the hydraulic cylinder 28 is connected to a bracket 31 provided on the lower surface of the front end of the hydraulic cylinder 28, and is provided at the rear of the cabin 4 or within the cabin 4.

Hydraulic pressure is supplied to the hydraulic cylinder 28, and the rod 30
When the loading platform 14 is extended and stored as shown by the solid line in FIG.
The front portion of the loading platform 14 is fitted to prevent the front portion of the loading platform 14 from shaking vertically while traveling. Also, the protrusion 33 is the receiver 34
When the loading platform is stored, the roller 20 is connected to the vertical joist 1.
The vertical joist 12 is fitted into a notch 35 (FIG. 5) provided on the upper side 12a of the vertical joist 2 or a downwardly opening recess 36 provided on the upper side 12a of the vertical joist 12, so that the vertical joist 12 descends and comes into pressure contact with the top of the rail 7.

When loading civil engineering construction machinery or other cargo onto the loading platform 14, the control lever 32 is operated to stop the hydraulic pressure supply to the hydraulic cylinder 28, and the hydraulic cylinder 2
Tighten rod 30 of No.8. Then, the vertical joist 12 first starts to retreat horizontally, and the notch 35 (Fig. 5)
Alternatively, the recess 36 (FIG. 6) rides over the roller 20, the protrusion 33 escapes backward from the support 34, the vertical joist 12 floats on the rail 7, and the front part is moved by the rollers 20, one each on the left and right, or The rear part is supported by two rollers 11 provided at the front and rear, which are fitted into grooves 13 of the vertical joists 12, and are horizontally retreated by a certain amount. When the stopper 21 collides with the roller 20 at the tip of the arm 18 in the retracted position, the arm 1
8 receives a moment in the direction of arrow A, rotates in the direction of arrow A around the support shaft 17, and begins to stand up. At that time, the length of the arm 18 and the length between the support shaft 17 and the hinge 5 correspond to the amount of operation of the hydraulic cylinder 28.
A triangle consisting of the length between the roller 20 and the hinge 5 is determined, and the inclination angle α of the loading platform 14 is determined by the hydraulic cylinder 2.
It changes in a one-to-one relationship with the operating amount of No. 8. Arm 1
8 collides with the rear stopper 23, the loading platform 14
The inclination angle α becomes maximum, and the rod 30 of the hydraulic cylinder 28 stops. During this time, the rear frame 6 rotates around the hinge 5, and the supporting legs 16 land on the ground 26, causing the rear frame 6 and the loading platform 12 on the vertical joists 12 to
support. Next, the rear gate 24 is opened in the direction of arrow B using the hinge 25 as a fulcrum, the rear gate 24 is placed on the ground 26, and in this state, machinery is placed on the loading platform 14 by itself or a heavy object is pushed by a forklift or the like. After loading the cargo, the rear gate 24 is raised and the lever 32 is operated so as to extend the rod 30 of the hydraulic cylinder 28. Then, the loading platform 14 moves forward and through the reverse stroke to the inclination angle α
decreases, and after the arm 18 rotates in the reverse A direction and collides with the stopper 22, the vertical joist 12 moves toward the rail 7.
The notch 3 is moved forward approximately horizontally while being supported by the roller 20 and the two front and rear rollers 11 at a slight distance from the notch 34.
5 or the recess 36 fits into the roller 20, and the vertical joist 1
2 is tightly fitted onto the rail 7 and locked in the storage position.

(Effect of the invention) As explained above, in the present invention, the front wheel 1
and a front frame 3 supported by the rear wheels 2, a rear frame 6 pivotally attached to the rear end of the front frame 3 via a hinge 5, and a cargo platform 14 disposed on the upper part of both frames 3 and 6. The lower surface of the loading platform 14 is integrally provided with a vertical joist 12 that extends back and forth and is supported by the rear frame 6 so as to be slidable back and forth, and the rear frame 6 lands on the ground 26 when the loading platform is tilted. In a sliding cargo platform truck equipped with supporting legs 16, the rear frame 6 and the vertical joists 12 are connected by a hydraulic cylinder 28 that is extendable back and forth, and the amount by which the cargo platform 14 slides rearward is controlled by the hydraulic cylinder 28. A joist stopper 21 is provided on the vertical joist 12, and an arm mechanism is provided that is linked to the joist stopper 21 to tilt the loading platform 14. A support shaft 17, an arm 18 rotating around the support shaft 17, and a roller 2 supported by the tip of the arm 18 and abutting against the joist stopper 21.
0, and arm stoppers 22 and 23 for regulating the amount of rotation of the arm 18, and the arm 18 has:
Since it is equipped with a spring member (tension spring 27) that suppresses the rotational force when the loading platform 14 rotates in the direction of tilting, the arm Mechanism (spindle 17, arm 18, arm stopper 22,
23, tension spring 27, etc.), the loading platform 14 can be tilted. Therefore, a dedicated hydraulic cylinder for tilting the loading platform 14 can be omitted, making the structure simple and inexpensive. Moreover, the arm mechanism of the present invention includes a support shaft 17 in the vehicle width direction supported by the front frame 3, an arm 18 that rotates around the support shaft 17, and a joist stopper supported by the tip of the arm 18. 21, and arm stoppers 22 and 23 that restrict the amount of rotation of the arm 18.
Reference numeral 8 denotes a spring member (tension spring 27) that suppresses the rotational force when the loading platform 14 rotates in the direction of inclination.
Even if the hydraulic cylinder 28 suddenly moves the loading platform 14 backward due to an erroneous operation, the arm 18 will move slowly to the loading platform 14 due to the spring force.
Tilt. Therefore, there is no need to commonly control the hydraulic cylinder 28 and the arm mechanism by means such as electricity or valve adjustment. It is possible to perform loading platform tilting work. Moreover, in this work of tilting the loading platform, when the joist stopper 21 of the vertical joist 12 collides with the roller 20 constituting the arm mechanism, the arm 18 rotates around the support shaft 17 to tilt the vertical joist 12 and the loading platform 14. Therefore, while adopting a simple arm mechanism,
It is possible to perform cargo platform tilting work without waste.

Further, according to the present invention, the rear frame 6 is pivotally connected to the rear end of the front frame 3 supported by the front wheels 1 and the rear wheels 2 via the hinge 5. Therefore, since the rear frame 6 is arranged at the rear of the spring receiver 5' described in the embodiment, even if it is rotatable around the hinge 5, it does not affect the support of the front frame 3, and moreover, The frame 6 is given the function of a guide member for the vertical joists 12. Therefore, a sliding loading platform can be obtained without increasing the number of parts.

Moreover, since the rear frame 6 supports the loading platform vertical joists 12 so as to be able to slide back and forth, there is no need to provide long guide rails to support the vertical joists 12, and the structure is simplified. When tilting, the rear frame 6 descends backwards from the hinge 5, so it is easy to give a large inclination angle α to the vertical joist 12 by just slightly raising the front end of the vertical joist 12 with the arm 18, and when the loading platform 14 is stored The height of the vehicle is also reduced, the overall center of gravity can be lowered, stability can be increased, and cargo can be easily loaded and unloaded onto the platform 14.

Further, according to the present invention, since the support leg 16 is provided which lands on the ground when the loading platform is tilted, a large load is applied between the hinge 5 and the rear end of the loading platform while the loading platform 14 acts as a footboard. The vertical joist 1 can also be supported by the supporting legs 16, maintaining high durability.
2. The loading platform 14 can be supported.

(Another embodiment) As shown in FIGS. 7 and 8, a chevron-shaped guide rail 40 is attached to the inside of the rear half of the front frame 3, and a vertical joist 12 is installed above the guide rail 40.
When the rollers 41 attached to the inside of the rollers 41 are allowed to run, the vertical joists between the hinges 5 and the rollers 20 can be supported by the rollers 41 while the inclined loading platform 14 is being advanced to the horizontal storage position. The frictional resistance between the frame 3 and the vertical joist 12 is reduced, and the sudden drop of the loading platform and the impactful seating of the vertical joist 12 on the front frame 3 (knocking phenomenon), which tend to occur when the frictional resistance between the two is large, are reliably prevented. It can be prevented. Moreover, in order to allow the vertical joists 12 to be brought into close contact with the front frame 3 when the loading platform is stored, a notch 3 is provided on the upper side 12a (FIG. 5) of the vertical joists 12.
5 and the recess 36 (FIG. 6) can be omitted.

Outriggers 43 (second
Attaching the (Fig.) will increase the stability when the loading platform is tilted.

[Brief explanation of drawings]

Fig. 1 is a schematic left side view of a truck to which the present invention is applied, Fig. 2 is a schematic plan view of the portion viewed from the - arrow in Fig. 1, and Figs. 3 and 4 are - and - in Fig. 2.
5 is an enlarged longitudinal sectional view of a part of FIG. 1, FIG. 6 is a drawing corresponding to FIG. 5 to show another embodiment, and FIG. 7 is a diagram showing still another embodiment. A schematic left side view for showing the embodiment, FIG. 8 is the same as that shown in FIG.
It is an enlarged cross-sectional view. 1...Front wheel, 2...Rear wheel, 3
... Front frame, 5 ... Hinge, 6 ... Rear frame, 12 ... Vertical joist, 14 ... Loading platform, 16 ... Support leg, 17 ... Support shaft (part of arm mechanism), 18 ...
... Arm (part of the arm mechanism), 20 ... Roller (part of the arm mechanism), 21 ... Joist stopper,
22...Arm stopper (part of the arm mechanism),
23...Arm stopper (part of the arm mechanism),
26...Ground, 27...Tension spring (an example of a spring member of the arm mechanism), 28...Hydraulic cylinder.

Claims (1)

[Claims] 1 A front frame 3 supported by a front wheel 1 and a rear wheel 2, a rear frame 6 pivotally attached to the rear end of the front frame 3 via a hinge 5, and both frames 3, 6.
The lower surface of the loading platform 14 is integrally provided with a vertical joist 12 that extends back and forth and is supported by the rear frame 6 so as to be slidable back and forth. 1 is a sliding platform truck equipped with supporting legs 16 that land on the ground 26 when the platform is tilted, the rear frame 6 and the vertical joist 1
2 are connected to each other by a hydraulic cylinder 28 that is extendable back and forth, and the joist stopper 21 regulates the amount by which the loading platform 14 slides rearward by the hydraulic cylinder 28.
is provided on the vertical joist 12, and the joist stopper 2
1 is provided to tilt the loading platform 14, and the arm mechanism includes a support shaft 17 in the vehicle width direction that is pivotally supported by both frames 3, and an arm 18 that rotates around the support shaft 17. , a roller 20 supported by the tip of the arm 18 and abutting against the joist stopper 21, and arm stops 22 and 23 for regulating the amount of rotation of the arm 18, and the arm 18 tilts the loading platform 14. A sliding loading truck characterized by comprising a spring member 27 that suppresses the rotational force when rotating in the direction.