JP4633917B2 - Rear entry prevention device for vehicle tilting vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is attached to the rear end portion of a vehicle in which the load platform is tilted rearward when the load is lowered and the load is slid down and discharged from the rear end portion of the load platform, and prevents entry of a low-height vehicle from the rear. The present invention relates to a rear entry prevention device.
[0002]
[Prior art]
As a vehicle for tilting the loading platform backward when unloading the cargo and causing the load to slide down from the rear end of the loading platform, for example, there are a dump truck, a self-loader, other heavy equipment, and a transport vehicle. An example of a conventional dump truck is shown in FIG. In this conventional dump truck, the loading platform 5 rotates from the normal state shown in FIG. 5A to the inclined state shown in FIG. 5B around the loading platform rotation shaft 4 provided at the rear end of the chassis 2. The load in the loading platform 5 is slid down and discharged. At this time, if the inrush prevention bumper 14 is fixed, the bumper 14 and the inclined loading platform 5 collide. Therefore, in the conventional rear entry prevention device 40, as shown in the figure, a rotation shaft 47 for the entry prevention bumper is separately provided at the rear end portion of the chassis 2, and the support is rotatably supported around the rotation shaft 47. The inrush prevention bumper 14 is fixed to the rear end of the rod 48, the support rod 48 and the loading platform 5 are supported via the link rod 49, and the bumper 14 is rotated downward from a predetermined position as the loading platform 5 is inclined. It was configured to move.
[0003]
On the other hand, such dump trucks are also used for transporting grains and the like. In such a case, it is required to feed the load directly to the upper entrance of the container 20 or the like placed on the traveling surface. ing.
[0004]
[Problems to be solved by the invention]
However, in such a case, the conventional rear-entry prevention device has a problem that the support rod or bumper collides with an arrangement such as a container when it is rotated downward as shown in FIG. there were. For this reason, conventionally, it has also been a problem for a vehicle user to remove or attach the rear entry prevention device as necessary.
[0005]
Therefore, the main problem of the present invention is that the vehicle can be firmly fixed at a predetermined entry prevention position when traveling or parked on the road with the cargo bed not inclined, while the rear edge of the cargo bed is lower when the cargo bed is inclined. An object of the present invention is to provide a rear intrusion prevention device capable of avoiding a collision with an arrangement on the side.
[0006]
[Means for Solving the Problems]
The present invention that has solved the above-mentioned problems is a rear entry preventing device that is attached to the rear part of a vehicle with a cargo bed tilting that causes the cargo bed to tilt backward and slides and discharges the load from the rear edge of the cargo bed;
A pair of left and right guide cylinders fixed to the rear end of the vehicle chassis and extending linearly along the front-rear direction;
Connecting the front ends of these guide cylinders to each other, and a connecting rod fixed to the chassis;
A pair of left and right support rods extending in a straight line along the front-rear direction and being linearly slidable in the front-rear direction while being guided while being inserted into the guide tube,
An intrusion prevention bumper that connects the rear ends of these support rods, and
Between the pair of left and right guide cylinders, provided between the connecting rod and the intrusion prevention bumper in the front-rear direction, and using the connecting rod as a reaction force receiver, the intrusion prevention bumper is guided by the guide tube by the guide rod. A single bumper jack that slides relative to the chassis between a predetermined entry prevention position below the rear end of the vehicle and a front position thereof linearly along the longitudinal direction according to the cylinder;
Equipped with a,
A rear entry prevention device for a vehicle with an inclined carrier , wherein the guide cylinder, the support rod, the bumper, and the connecting rod are configured to always form a rectangular frame along the horizontal direction .
[0007]
In this way, the bumper bumper is supported by the expansion / contraction mechanism, and along with the expansion / contraction, it slides linearly in the front-rear direction between a predetermined entry prevention position below the rear end of the vehicle and its front position. When the vehicle is parked or stopped on the road when the cargo bed is not tilted, it can be firmly fixed at the predetermined entry prevention position, but when the cargo bed is tilted, it can avoid a collision with the arrangement below the rear edge of the cargo bed. It becomes like this. In the present invention, since the bumper is slid linearly, it is easy to make the sliding mechanism of the intrusion prevention bumper simple and strong as compared with a structure with rotation. The Ru can minimize the moving distance of the bumper.
[0008]
The telescopic mechanism of the present invention, the structure is very simple, easy to secure the strength, it is easy attachment to existing vehicles.
[0009]
[0010]
As a more specific aspect,
A pair of outer through-lock holes respectively formed on both side walls of each guide cylinder;
An inner through-lock hole formed along a transverse direction in a portion between the pair of outer through-lock holes in each of the support rods;
A pair of left and right lock members that are individually provided for each of the support rods and are inserted into and extracted from the pair of outer through lock holes and inner through lock holes in each of the support rods ;
Wherein provided along the lateral direction on the lower side of the guide tube so as to intersect with the bumper jacks, while keeping the reaction force against the guide tube, gives a driving force of the penetration and extraction with respect to said locking member With a rock jack,
We recommend the one with
[0011]
In the present invention, for example, at least prior to running, with the bumper jack being extended, the bumper is positioned at the intrusion prevention position, and the lock member is inserted into the through lock hole of each guide cylinder and the inner through lock hole therebetween by the lock jack. By penetrating inward, the support rod is locked so as not to move in the front-rear direction, whereby the rush preventing bumper at the rear end portion of the support rod can be locked in the rush preventing position. In particular, when locking each support rod, the lock member penetrates from the through lock hole on the one side wall of the guide tube to the through lock hole on the other side wall through the through lock hole on the other side wall. The rush prevention effect is also enhanced.
[0012]
On the other hand, when unloading the load, the bumper jack contracts with the lock jack removed from at least the inner through-lock hole of each support rod with the lock jack as the load bed tilts or prior to the load bed tilt. Thus, the bumper can be slid linearly to the front position along the front-rear direction, thereby avoiding a collision with an arrangement at the lower rear end of the loading platform.
[0013]
In this case, it is preferable to provide a control means for controlling these operations and automatically move the inrush prevention bumper back and forth.
[0014]
On the other hand, in particular, when a cargo such as grain as described above is directly input from a cargo bed to a container or the like having an input port, according to the invention described in claim 6, It is recommended to provide an openable / closable discharge chute that penetrates inside and outside. When unloading, if the loading platform is tilted so that the exit portion of the discharge chute faces the inside or inside of the loading port, it is possible to load the load smoothly and reliably.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to an example of a dump truck.
1 to 3 show a dump truck 1 equipped with a rear intrusion prevention device according to the present invention. In the dump truck 1, the rear end 2 b of the chassis 2 extends rearward from the rear wheel 3, and the loading platform rotating shaft 4 is provided in the extended portion 2 b, and the loading platform 5 is supported by the loading platform rotating shaft 4. The rear entry preventing device 10 according to the present invention is attached to the lower side of the center in the width direction of the chassis rear end 2b.
[0016]
As shown in FIGS. 4 to 6, the rear intrusion prevention device 10 is configured as follows. That is, a pair of left and right guide cylinders 11 and 11 extending linearly along the front-rear direction are fixed to the lower surface of the chassis rear end 2b via the mounting base 12, respectively. , 11 are inserted into the support rods 13, 13 extending linearly along the front-rear direction. The pair of left and right support rods 13 and 13 are parallel to each other. A rush prevention bumper 14 is fixed between the rear end portions so as to connect the rear end portions of the pair of left and right support rods 13 and 13, while the front end portions of the guide cylinders 11 and 11 are connected to each other. A connecting rod 15 is fixed between the front end portions so as to be connected. This connecting rod 15 is also connected and fixed to the chassis 2. Thus, the pair of support rods 13 and 13 are slidable linearly in the front-and-rear direction (that is, not moved in the vertical direction) while being guided by the guide cylinders 11 and 11, so that the intrusion-preventing bumper connected thereto. 14 also operates in the same manner. In particular, with this configuration, the guide cylinders 11, 11, the support rods 13, 13, the bumpers 14, 14 and the connection rod 15 always form a rectangular frame along the horizontal direction, so that the strength against a collision from the rear is extremely high. There is also an advantage that becomes higher. However, the connecting rod 15 can be omitted in the present invention. The guide cylinders 11 and 11 can be directly connected and fixed to the rear end 2b of the chassis 2 without using the pedestal 12.
In addition, a hydraulically-returned bumper jack 16 is rotatably connected via a pin across the central portion of the connecting rod 15 and the central portion of the inrush prevention bumper 14 in parallel with the guide cylinders 11 and 11. The In the illustrated example, the bumper jack 16 causes the intrusion prevention bumper 14 to move along the front and rear direction along the support rods 13 and 13 along with the support rods 13 and 13 and below the rear end of the vehicle. It is possible to slide between a predetermined entry prevention position (in the illustrated example, directly below the rear end of the loading platform) and its front position. The sliding range of the bumper 14 may be determined as appropriate, but when the loading platform 5 protrudes rearward from the rear end of the chassis 2 and the loading platform rotation shaft 4 is located at the chassis rear end 2b as in this example. In this case, the forward movement limit is preferably the rear end of the chassis 2, and the sliding range in that case is normally 500 to 1000 mm.
[0018]
Furthermore, outer side through-lock holes 11h and 11h are formed in both side walls of the guide cylinders 11 and 11 along a transverse direction orthogonal to the guide cylinders 11 and 11, respectively, and the bumper 14 is in a predetermined entry prevention position. Inner through-lock holes 13h are respectively formed along the transverse direction at the base end portion of the support rod 13 corresponding to the space between the outer through-lock holes 11h and 11h. Then, lock members 17 and 17 that penetrate the guide cylinders 11 and 11 from one side of the outer through-locking hole 11h through the through-locking hole 13h of the support rods 13 and 13 into the through-locking hole 11h on the other side wall, respectively. Has been placed. The lock member 17 in the illustrated example has a common base shaft portion 17p supported by shaft support portions 18 and 18 provided on the lower surfaces of the guide cylinders 11 and 11, respectively. The base shaft portion 17p and one shaft support portion 18 are provided. The hydraulic backward-actuated lock jacks 19 are connected to each other through pins so as to be rotatable. Therefore, the lock jack 19 can be expanded and contracted so that the lock member 17 can be integrally inserted into and extracted from the lock holes 11h and 13h on each side.
[0019]
On the other hand, although not shown, a hydraulic unit for the bumper jack 16 and the lock jack 19 and a computer for controlling the hydraulic unit (these constitute the control means of the present invention) are mounted on the dump truck.
[0020]
In the present apparatus example having the above-described configuration, the inrush prevention bumper 14 can be operated as follows.
That is, when traveling, for example, prior to traveling, with the bumper jack 16 extended as shown in FIG. 6 and the bumper 14 positioned at the entry prevention position, the lock jack 19 is extended to lock the lock members 17, 17. The guide cylinders 11 are inserted into the through-lock holes 11h and 11h and the inner through-lock holes 13h therebetween, and the support rods 13 and 13 are locked so as not to move in the front-rear direction. The rush prevention bumper 14 is controlled to be locked at the rush prevention position. In particular, when the support rods 13 and 13 are locked, the lock members 17 and 17 are inserted into the through lock holes 11h on the other side wall from the through lock holes 11h on the one side wall of the guide tubes 11 and 11 through the through lock holes 13h on the support rod. So that a very strong lock is possible. FIG. 7A shows this state.
[0021]
On the other hand, when unloading or the like, as shown in FIG. 8, the lock jack is first contracted as shown in FIG. , 13 is extracted from the inner through-locking holes 13h, 13h to release the lock. Thereafter, in this state, the bumper jack 16 is contracted linearly along the front-rear direction by contraction of the bumper jack 16, as shown in FIG. Slide to the front retracted position. As a result, the bumper 14 does not exist at the unloading position below the rear end of the loading platform 5, so that the loading platform 5 can be tilted backward without colliding with the bumper 4, and the container 20 or the like is positioned at this position. Even if it does not collide with the bumper 14.
[0022]
On the other hand, in the above example, since the left and right lock members 17 and 17 are integrated via the base shaft portion 17p, the lock member 17 is integrally inserted into and extracted from the lock holes 11h and 13h on the left and right sides. As shown in FIG. 9, the left and right lock members 17 and 17 and the base shaft portions 17P and 17P are separated from each other as shown in FIG. The drive means such as the jacks 19 and 19 can be provided individually, and the left and right sides can be individually locked. In this case, it is natural that the lock members 17 and 17 are locked at different times, but they can also be locked at the same time, and in particular, the lock means on one side is clogged with foreign matter in the lock holes 11h and 13h. Even when it becomes unusable due to the above reason, there is an advantage that the locking by the lock means on the other side is possible.
[0023]
The example shown in FIG. 10 is a reference example not included in the present invention, and a base end member 31 that is pivotally supported via a pin with respect to the connecting rod 15 having one end fixed to the chassis 2, and other base end members 31. A pair of link mechanism portions 30A and 30B comprising a tip member 32, one end of which is rotatably connected to the end via a pin and the other end is pivotally supported via a pin with respect to the intrusion prevention bumper 14 are provided. This is a link device that expands and contracts in the vehicle longitudinal direction in a pantograph manner. The pantograph type link device of the illustrated example is attached to the lower side of the chassis 2 in a posture along a plane (normally horizontal plane) along the front-rear direction and the left-right direction, and extends and contracts along the plane as shown by a two-dot chain line. It does not swell up and down. Further, the link mechanism portions 30A and 30B are configured such that the left and right widths expand when contracted, but do not expand until the vehicle width is exceeded. As a telescopic drive source, a hydraulic backward-acting bumper jack 16 extending in the front-rear direction is provided across the central portion of the connecting rod 15 and the central portion of the inrush prevention bumper 14 in the same manner as in the above example. .
[0024]
<Others>
(B) The vehicle to which the present invention device is applied is not particularly limited in shape and size as long as it is of a type in which the loading platform is inclined backward and the load is slid down and discharged from the rear end of the loading platform. In addition, a self-loader, other heavy equipment, a transport vehicle, etc. can be employed.
[0025]
(B) When transporting grains and the like, it is required to load the cargo directly from the loading platform into a container or the like having a slot. Therefore, in order to deal with such a case, it is recommended that an openable / closable discharge chute 30 penetrating into and out of the loading platform 5 is provided at the bottom of the rear end portion of the loading platform 5 as shown in FIGS. 11 and 12. The lower end of the discharge chute 30 in the illustrated example is formed so as to be positioned on the upper side of the rear entry prevention device 10 (the support rod 11) of the present invention in a state where the loading platform is not inclined. When unloading, the bumper 14 is pulled forward, and the loading platform 5 is inclined so that the outlet of the discharge chute 30 faces the inside of the inlet 21 (FIG. 11) or above the inlet 21 (FIG. 12). By doing so, it becomes possible to smoothly and surely load the cargo.
[0026]
(C) In particular, the container 20 shown in FIG. 12 has a lower part 22 projecting laterally from the peripheral wall of the upper inlet 21, and the conventional rear entry preventing device collides with the projecting part 22. In the present invention, the bumper 14 is retracted together with or prior to the inclination of the loading platform 5, and the bumper 14 does not exist below the rear end of the loading platform, so that such a collision does not occur.
[0027]
(D) In the above example, the bumper jack 16 is driven by the bumper 14 and the lock jack 19 is driven by the lock member 17. However, in the present invention, the lock member 17 is operated manually. it can.
[0028]
【The invention's effect】
As described above, according to the present invention, the rear entry prevention device can be firmly fixed at a predetermined entry prevention position during traveling, but can avoid collision with an arrangement below the rear end of the carriage when tilting the carriage. .
[Brief description of the drawings]
FIG. 1 is a side view of a dump truck to which an example of an apparatus according to the present invention is applied.
FIG. 2 is a plan view showing only a loading platform portion of a dump truck to which an example of an apparatus according to the present invention is applied.
FIG. 3 is a rear view of the dump truck to which the device example according to the present invention is applied.
FIG. 4 is a side view of an example apparatus according to the present invention.
FIG. 5 is a plan view of an example apparatus according to the present invention.
FIG. 6 is a rear view of an example of an apparatus according to the present invention.
FIG. 7 is a schematic diagram for explaining the operation of an example of an apparatus according to the present invention.
FIG. 8 is a rear view for explaining the operation of the apparatus example according to the present invention.
FIG. 9 is a rear view of a form in which another locking means is employed.
FIG. 10 is a plan view of a form in which another expansion / contraction mechanism is employed.
FIG. 11 is a schematic diagram for explaining the operation of another example of the apparatus according to the present invention.
FIG. 12 is a schematic diagram for explaining the operation of another example of the apparatus according to the present invention.
FIG. 13 is a rear view for explaining the operation of the conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Dump truck, 2 ... Chassis, 3 ... Rear wheel, 4 ... Loading platform rotation axis, 5 ... Loading platform, 10 ... Rear part intrusion prevention apparatus, 11 ... Guide cylinder, 12 ... Mounting base, 13 ... Supporting rod, 14 ... Intrusion prevention Bumper, 15 ... connecting rod, 16 ... bumper jack, 17 ... lock member, 18 ... shaft support, 19 ... lock jack.

Claims (3)

A rear intrusion prevention device attached to the rear of a vehicle with a cargo bed tilting to tilt the cargo bed backward and slide the load from the rear edge of the cargo bed;
A pair of left and right guide cylinders fixed to the rear end of the vehicle chassis and extending linearly along the front-rear direction;
Connecting the front ends of these guide cylinders to each other, and a connecting rod fixed to the chassis;
A pair of left and right support rods extending in a straight line along the front-rear direction and being linearly slidable in the front-rear direction while being guided while being inserted into the guide tube,
An intrusion prevention bumper that connects the rear ends of these support rods, and
Between the pair of left and right guide cylinders, provided between the connecting rod and the intrusion prevention bumper in the front-rear direction, and using the connecting rod as a reaction force receiver, the intrusion prevention bumper is guided by the guide tube by the guide rod. A single bumper jack that slides relative to the chassis between a predetermined entry prevention position below the rear end of the vehicle and a front position thereof linearly along the longitudinal direction according to the cylinder;
Equipped with a,
The rear entry prevention device for a vehicle with a tilted carrier , wherein the guide cylinder, the support rod, the bumper, and the connecting rod are configured to always form a rectangular frame along the horizontal direction . A pair of outer through-lock holes respectively formed on both side walls of each guide cylinder;
An inner through-lock hole formed along a transverse direction in a portion between the pair of outer through-lock holes in each of the support rods;
A pair of left and right lock members that are individually provided for each of the support rods and are inserted into and extracted from the pair of outer through lock holes and inner through lock holes in each of the support rods ;
Wherein provided along the lateral direction on the lower side of the guide tube so as to intersect with the bumper jacks, while keeping the reaction force against the guide tube, gives a driving force of the penetration and extraction with respect to said locking member With a rock jack,
The rear entry prevention device according to claim 1, further comprising: At least prior to travel, with the bumper jack extended, the bumper is positioned at the intrusion prevention position, and the lock jack causes the lock member to be inserted into the through lock hole of each guide cylinder and the inner through lock hole therebetween. Control to lock the support rod so that the support rod does not move in the front-rear direction, thereby locking the entry bumper at the rear end of the support rod at the entry prevention position;
With the loading platform tilting or prior to loading platform tilting, the locking member is pulled out from at least the inner through-lock hole of each support rod by the locking jack, and the bumper jack is retracted by the contraction of the bumper jack in the unlocked state. comprising a control means for performing control to slide linearly to the forward position along the longitudinal direction, the rear inrush prevention apparatus bin tip vehicle according to claim 1 or 2, wherein.

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