JP3745053B2 - Loading platform lock mechanism for mobile vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a loading platform mobile vehicle having a loading platform moving device that moves a loading platform back and forth on a chassis frame or a subframe (hereinafter referred to as a frame) that is tiltably connected to the chassis frame and a rear portion thereof. The present invention relates to a lock mechanism for a loading platform for locking.
[0002]
[Prior art]
The loading platform mobile vehicle, which allows the loading and unloading work to be performed easily by moving the loading platform back and forth on the frame and tilting it, locks the loading platform to the frame at the storage position so that the loading platform does not move during traveling, The lock needs to be released so that the platform can move.
[0003]
As shown in FIG. 5, a conventional loading platform locking mechanism for a loading platform mobile vehicle is provided with a hook 21 detachable from a loading platform pin 20 on the frame side, and this hook 21 is connected to a PTO by a spring 22 and a lock cable 23. As shown in FIG. 6, when the PTO handle 26 is operated and the push-pull cable 27 is pulled to switch the PTO 24 to ON as shown in FIG. 6, as the shifter lever 25 rotates. The lock cable 23 and the spring 22 are pulled, and the hook 21 is rotated counterclockwise in the drawing to be detached from the pin 20 and unlocked. When the PTO handle 26 is pushed in and the PTO 24 is switched to OFF, the shifter lever 25 returns to the position shown in FIG. 5 and the lock cable 23 is loosened along with its rotation, and the hook 21 is rotated clockwise in FIG. The loading platform is locked to the frame.
[0004]
[Problems to be solved by the invention]
However, since this lock mechanism operates the hook 21 by the lock cable 23, the operation is unstable, and there are cases where the lock mechanism cannot be securely locked or released. Further, when the PTO 24 is switched by the PTO handle 26, the lock is released at the same time, so that the operation of the PTO handle 26 becomes heavy. Further, the shifter lever 25 may move due to the weight of the hook 21 and the force of the spring 22, and the PTO 24 may be cut.
[0005]
The present invention solves the above-mentioned problem in the loading platform locking mechanism of the loading platform mobile vehicle, and provides a loading platform locking mechanism of the loading platform mobile vehicle capable of reliably and easily locking and releasing the loading platform. For the purpose.
[0006]
[Means for Solving the Problems]
The present invention relates to a loading platform mobile vehicle having a loading platform moving device that moves the loading platform back and forth on the frame, and the cylinder of the loading platform moving device provided between the frame and the loading platform is connected to the loading platform by a mounting pin, The pin hole into which the pin is inserted has at least one of the loading platform side or the cylinder side as a long hole in the front-rear direction , a stopper is provided on the frame, and the loading platform engages with the stopper in the retracted position. The cylinder is provided with a guide for turning the hook upward when extended, and the long hole does not hold until the lock is released even if the cylinder starts to extend when the load is in the retracted position. The lock mechanism of the loading platform of the loading platform mobile vehicle is configured by the length that does not move .
[0007]
When the loading platform is in the retracted position, the cylinder of the loading platform moving device is in a shortened state, and the hook is engaged with the stopper, and the loading platform is locked so as not to move on the frame.
[0008]
When unloading work, the cylinder is extended. When the cylinder starts to extend, first, a guide provided in the cylinder rotates the hook upward to disengage it from the stopper and unlock the loading platform. The pin hole into which the mounting pin is inserted is a long hole in the front-rear direction, and the length thereof is also appropriately selected . Therefore, the loading platform does not move until the lock is released. When the cylinder further extends, the loading platform moves backward.
[0009]
When the loading / unloading work is completed, the cylinder is shortened and the loading platform is moved forward. When the cylinder is shortened, the guide moves forward and the hook rotates downward, and when the loading platform returns to the retracted position, the hook engages with the stopper and the loading platform is locked. It becomes possible to run.
[0010]
When the hook is provided with a roller guided by a guide, the hook is smoothly rotated upward.
In addition, if the urging means for urging the hook toward the stopper side is provided, the loading platform is more reliably locked in the retracted state.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view of a loading mechanism of a loading platform mobile vehicle according to an embodiment of the present invention, FIG. 2 is a plan view of the loading mechanism of the loading platform mobile vehicle, and FIGS. 3 and 4 are loading platforms. It is explanatory drawing of the action | operation of this locking mechanism.
[0012]
A loading platform 2 is placed on the frame 1 of the loading platform mobile vehicle so as to be movable back and forth (left and right in the figure), and a cylinder 3 of the loading platform moving device is provided between the frame 1 and the loading platform 2. . The tube 4 of the cylinder 3 is connected to the front portion of the frame 1 by a mounting pin (not shown), and the rod 5 of the cylinder 3 is connected to the clevis 10 of the loading platform 2 by a mounting pin 9. Here, the pin hole 11 on the clevis 10 side into which the mounting pin 9 is inserted is a long hole in the front-rear direction. The pin hole on the rod 5 side may be a long hole.
[0013]
At the rear end of the frame 1, a support base 14 with a stopper 6 standing is fixed in the vicinity of the cylinder 3. A hook 7 is pivotally attached to a hook clevis 15 of the loading platform 2 by a hook pin 13 so as to be rotatable up and down. The hook 7 has an inclined portion 7A formed on the lower side of the tip. The rear side of the inclined portion 7A is stepped, and engages with the stopper 6 when the loading platform 2 is in the retracted position.
[0014]
On the cylinder 3 side of the hook 7, a roller 12 is rotatably supported by a support shaft 16. Further, a guide 8 is fixed to the rod 5 of the cylinder 3 so as to contact the roller 12 and rotate the hook 7 upward.
A spring 17 that biases the hook 7 downward is provided between the loading platform 2 and the hook 7.
[0015]
When the loading platform 2 is in the retracted position, the cylinder 3 is in a shortened state, and the hook 7 is rotated downward about the hook pin 13 as a rotation axis by its own weight and the bias of the spring 17. The hook 7 engages with the stopper 6 and the loading platform 2 is locked so as not to move on the frame 1.
[0016]
When performing the loading / unloading operation of the load, the cylinder 3 is extended. When the cylinder 3 starts to expand, first, the guide 8 provided on the rod 5 pushes the roller 12, and as shown in FIG. 3, the hook 7 is rotated upward to be detached from the stopper 6 to lock the loading platform 2. To release. At this time, since the roller 12 rolls on the guide 8, the hook 7 rotates smoothly.
[0017]
Since the pin hole 11 into which the mounting pin 9 is inserted is a long hole in the front-rear direction, the mounting pin 9 abuts on the rear end of the pin hole 11 while the cylinder 3 extends until the lock is released. The loading platform 2 does not move. When the cylinder 3 further extends, as shown in FIG. 4, the mounting pin 9 contacts the rear end of the pin hole 11 and pushes the clevis 10, so that the loading platform 2 moves rearward.
[0018]
When the loading / unloading operation is completed, the cylinder 3 is shortened and the loading platform 2 is moved forward. When the cylinder 3 is shortened, the guide 8 moves forward, so that the hook 7 rotates downward until the mounting pin 9 contacts the front end of the pin hole 11. When the cylinder 3 is further shortened, the loading platform 2 moves forward. While the loading platform 2 is returning to the retracted position, the hook 7 that is rotating downward contacts the stopper 6, but compared with the force that rotates downward due to the weight of the hook 7 and the bias of the spring 17, Since the expansion / contraction force is much larger, the hook 7 rotates upward so that the inclined portion 7A gets over the stopper 6, and the loading platform 2 returns to the retracted position. When the loading platform 2 returns to the storage position, the hook 7 rotates downward to engage with the stopper 6 and the loading platform 2 is locked. Therefore, the platform mobile vehicle can travel safely.
[0019]
【The invention's effect】
As described above, in the loading platform locking mechanism of the loading platform mobile vehicle according to the present invention, when the loading platform is moved backward, the loading platform is configured to move after the lock is reliably released. It does not cause time malfunction. Moreover, since the lock is released only by the operation of moving the cargo bed, it is safe and easy to operate.
[0020]
When the hook is provided with a roller guided by a guide, the hook is smoothly rotated upward.
In addition, if the urging means for urging the hook toward the stopper side is provided, the loading platform is more reliably locked in the retracted state.
[Brief description of the drawings]
FIG. 1 is a side view of a loading mechanism locking mechanism for a loading platform mobile vehicle according to an embodiment of the invention.
FIG. 2 is a plan view of a loading mechanism locking mechanism of the loading platform mobile vehicle.
FIG. 3 is an explanatory view of the operation of the loading platform locking mechanism.
FIG. 4 is an explanatory view of the operation of the loading mechanism locking mechanism.
FIG. 5 is an explanatory view of the operation of a conventional loading platform locking mechanism.
FIG. 6 is an explanatory view of the operation of a conventional loading platform locking mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame 2 Carriage 3 Cylinder 4 Tube 5 Rod 6 Stopper 7 Hook 8 Guide 9 Mounting pin 10 Clevis 11 Pin hole 12 Roller 13 Hook pin 14 Supporting base 15 Hook clevis 16 Support shaft 17 Spring

Claims (3)

In a load carrier mobile vehicle equipped with a carrier moving device that moves the carrier back and forth on the frame, the cylinder of the carrier moving device provided between the frame and the carrier is connected to the carrier by the mounting pin, and the mounting pin is inserted. The pin hole to be made has at least one of the loading platform side or the cylinder side as a long hole in the front-rear direction , a stopper is provided on the frame, and the loading platform is provided with a vertically rotatable hook that engages with the stopper at the storage position. Is provided with a guide to turn the hook upward during extension, and the long hole is the length that the carrier does not move until the lock is released even if the cylinder starts to extend when the carrier is in the retracted position. loading platform locking mechanism of the loading platform traveling vehicle, characterized in that it.   2. A loading platform locking mechanism for a loading platform mobile vehicle according to claim 1, wherein the hook is provided with a roller guided by a guide.   3. A loading mechanism for a loading platform mobile vehicle according to claim 1, further comprising a biasing means for biasing the hook toward the stopper side.

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