JP2007176465A - Truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a constitution to lower a spare tire, which is suitable for a vehicle transportation car, by making the most of an elevating device 100 of a bumper 14. <P>SOLUTION: A bumper device 10 is constituted of the bumper 14 and the elevating device 100. The elevating device 100 has a bumper driving part 11, a reverse preventing mechanism part 12 and a power part 13. The bumper driving part 11 is constituted of an oscillating arm 15, a bumper arm 16, an auxiliary connecting member 17 and a fixture 18 to substantially form a parallel link. A spare tire 101 is mounted on the bumper arm 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transport vehicle having a function of moving a part of a cargo bed part or lowering a part of a cargo bed part to the ground, such as a vehicle truck, a container truck, and a dump truck.

  Spare tires are mounted on cars such as passenger cars and trucks. In relatively small vehicles such as passenger cars, spare tires may be installed in the trunk room, but in large vehicles such as vehicle transporters, most spare tires are externally attached to the underside of the vehicle body. is there. For example, Patent Document 1 shows a configuration in which a spare tire is externally attached to the lower surface of a vehicle body.

  In addition, a freight vehicle having a function of changing the attitude of the loading platform or lowering the loading platform to the ground is known. For example, Patent Document 2 discloses a body loading / unloading vehicle. The body loading and unloading vehicle disclosed in Patent Document 1 is used when a vehicle such as a passenger car or a civil engineering machine is transported, and is equipped with a lift frame and a slidable body. In the vehicle disclosed in Patent Document 2, the lift frame is tilted and the body can be slid to lower the body to the ground.

Bumpers must be installed on cargo vehicles. In order to ensure safety when a pedestrian or other vehicle collides, the bumper must protrude backward from the vehicle body to some extent.
By the way, the above-mentioned vehicle transporter or the like functionally tilts the posture of the loading platform part backward or lowers it from the rear to the ground, and the bumper is attached in a state of protruding to the rear of the vehicle. The bumper gets in the way when tilting the door.
Therefore, a structure has been proposed in which a bumper is accommodated on the vehicle body side when performing operations such as loading and unloading (Patent Document 3).
Utility Model Registration No. 3097050 JP 2000-108768 A JP 2000-326807 A

As described above, in a large automobile such as a vehicle transporter, a spare tire is externally attached to the lower surface of the vehicle body. If the tire on the axle punctures, drop the spare tire from the underside of the car body and replace it with a punctured tire.
However, tires mounted on large automobiles are quite large and heavy. Therefore, it is difficult to remove the spare tire in the conventional vehicle transport vehicle, and it is practically impossible for one person to lower the spare tire.

In recent years, the performance of tires has improved, and the frequency of tire punctures is low. For this reason, it is uneconomical for a vehicle carrier to have a special configuration only for removing a spare tire.
Accordingly, the present invention focuses on the above-described problems of the prior art, and an object of the present invention is to develop a structure for removing a spare tire using another functional member.

As a result of intensive studies to solve the above-mentioned problems, the inventors have come up with the idea that a mechanism for moving the bumper is also used for removing the spare tire.
That is, as described above, in a freight vehicle having a function of changing the attitude of the loading platform or lowering the loading platform to the ground, there is a problem that the bumper becomes an obstacle when the loading platform is inclined. For this reason, in a vehicle transport vehicle or the like, it is desirable to temporarily retract the bumper when the loading platform is lowered to the ground. Therefore, the bumper is retracted to the ground side by the lifting device, and the spare tire is lifted and lowered by the bumper lifting device.

  The invention according to claim 1, which has been completed based on the above-described concept, is a lifting vehicle that raises and lowers a bumper in a transport vehicle including a vehicle body, a bumper attached to the vehicle body, and a loading platform that is movable relative to the vehicle body. A transport vehicle comprising a device, wherein a spare tire is attached to the lifting device.

According to the transport vehicle of the present invention, it is possible to change the position of the bumper to a traveling position suitable for traveling and a working position suitable for a predetermined work. Therefore, the bumper does not get in the way when working.
Moreover, since the spare tire is also lowered by lowering the bumper, the spare tire can be easily lowered.

  The invention according to claim 2 is the transport vehicle according to claim 1, wherein the lifting device includes an arm for holding a bumper, and a spare tire is attached to the arm.

  The invention according to claim 3 is the transport vehicle according to claim 1, wherein the lifting device includes two arms for holding a bumper, and a spare tire is attached between the arms. .

  In the transport vehicle according to the present invention, since the spare tire is attached to the dead space between the two arms, it is not necessary to secure a dedicated installation space for the spare tire.

  According to a fourth aspect of the present invention, the elevating device or the elevating device and the bumper are provided with a frame, and the frame is located near the bottom surface of the vehicle body when the bumper is in the raised position, and a spare tire is attached to the frame. The transport vehicle according to any one of claims 1 to 3, wherein the transport vehicle is provided.

  In the present invention, since the frame to which the spare tire is attached is located near the bottom surface of the vehicle body when the bumper is in the raised position, the total height of the lifting device and the spare tire is low, and the minimum ground clearance of the transport vehicle is kept high. be able to.

  According to a fifth aspect of the present invention, the elevating device has a link mechanism, the elements constituting the link mechanism have a three-dimensional frame, and a spare tire is attached to the frame. It is a transport vehicle in any one of thru | or 3.

  In the transport vehicle of the present invention, the lifting device has a link mechanism, and elements constituting the link mechanism form a three-dimensional framework, and a spare tire is attached to this framework. Therefore, the lifting device has high rigidity and can hold the spare tire firmly.

  The invention according to claim 6 is the transport vehicle according to any one of claims 1 to 6, wherein the elevating device has a drive source independent of the drive source for moving the loading platform.

  In the transport vehicle of the present invention, the drive source of the lifting device is different from the drive source of the cargo bed, and both are independent. Therefore, the spare tire can be attached and detached without moving the loading platform.

  According to a seventh aspect of the present invention, the lifting device includes a transmission mechanism that transmits the driving source and the movement of the driving source to the bumper to move the bumper, and at least one of the elements constituting the transmission mechanism is received from the bumper side. 7. The conveyance according to claim 1, wherein there is a thought point where two kinds of movements can occur with respect to force, and the element moves beyond the thought point when raising or lowering a bumper. Device.

The present invention includes a configuration for preventing the spare tire from descending. As mentioned above, the spare tire has a considerable weight, so it must be avoided that the spare tire falls or descends during traveling. Here, a configuration in which pins or the like are inserted in order to prevent the spare tire from descending can be considered. However, according to this configuration, a cylinder or the like for driving the pins or the like is required, and the number of parts increases.
In view of this, the present invention provides a function of preventing the spare tire from being lowered by suppressing an excessive increase in the number of parts.
That is, in the transport vehicle of the present invention, at least one of the elements constituting the transmission mechanism has a thought point that two types of motion can occur with respect to the force received from the bumper side. And when raising and lowering the bumper, the element moves beyond the thought point. For example, if the movement direction of the element when moving the bumper from the lowered position to the raised position is the positive direction, the element moves in the positive direction when moving the bumper from the lowered position to the traveling position. Over.
On the other hand, when force is applied to the bumper or spare tire, this force is transmitted to the transmission mechanism. As described above, since at least one of the elements is in a position beyond the thought point, when a force is applied from the bumper or the spare tire side, the element further tries to move in the positive direction. Therefore, the force from the bumper side can be resisted, and the spare tire is prevented from descending.

  A pivot member that pivots about a rotation axis can be employed for the element having a thought point.

  According to a ninth aspect of the present invention, the elevating device has a chain mechanism including a swing arm, a bumper arm that holds the rear bumper, an auxiliary connecting member, and a fixing member. When the swing arm is moved from the position to the travel position, the swing arm is moved from the suspended position toward the horizontal position, the auxiliary connecting member moves in parallel with the movement of the swing arm, and the bumper arm is substantially horizontal. The transport vehicle according to any one of claims 1 to 8, wherein the transport vehicle rises in a state where the posture is maintained.

Here, the “posture in which the swing arm is suspended” means that a portion (for example, a pin) connected to another member is positioned vertically, and is related to the external shape of the swing arm. Absent. For example, if the swing arm is circular and one pin is at the center, the appearance does not change even if the swing arm posture changes, but the positional relationship with the other pin is vertical. If there is, it is “the posture where the swing arm is suspended”.
In the transport vehicle according to the present invention, when the swing arm is moved from the lowered position to the raised position, the swing arm is moved from the suspended position toward the horizontal position. Therefore, in the transport vehicle of the present invention, the height of the bumper has a large drop before and after the movement, and the spare tire also has a large drop before and after the movement. Therefore, it becomes easier to remove the spare tire.
That is, when the movement of the arm according to the configuration disclosed in Patent Document 3 described above is viewed, the arm reaches a posture that hangs down from a posture inclined to one side, and further assumes a posture inclined in the opposite direction. Therefore, the height of the bumper decreases once from a high position and then increases again. Therefore, even if a spare tire is attached to the configuration disclosed in Patent Document 3, the spare tire cannot be lowered to the ground.
On the other hand, in the transport vehicle of the present invention, when moving from the working position to the traveling position, the swing arm moves from the suspended position toward the horizontal position. For this reason, the bumper (spare tire) always tends to rise from the lowest position. Of course, in the case of moving from a raised position suitable for traveling to a lowered position suitable for removing the spare tire, the swing arm moves from a state close to a horizontal posture toward a suspended posture.

  In the transport vehicle of the present invention, the spare tire can be easily removed. Further, the transport vehicle of the present invention removes the spare tire using a device for moving the bumper, and the number of parts is small.

Hereinafter, embodiments of the present invention will be described. In the following description, the “front and rear” relationship is based on the front and rear of the vehicle unless otherwise specified. That is, the driver's seat side is the front and the reverse is the back.
FIGS. 1-7 shows the vehicle carrier of this invention, (a) is the front view, (b) is a right view.
The vehicle carrier 1 has a structure as shown in FIGS. 1 to 7, and a vehicle loading device 2 is mounted on a vehicle body 4 of a truck (vehicle carrier) 1. The vehicle loading device 2 is roughly composed of a lift frame 3, a tilt mechanism 5 and a slide body (loading platform) 6.
The lift frame 3 is installed on the subframe 7 of the truck 1 and swings around a pin (not shown) provided on the rear end side of the truck. That is, the inclined posture can be taken as shown in FIGS.

  The tilt mechanism 5 is composed of a cylinder 5a and a link mechanism 5b, and is used to place the lift frame 3 in an inclined posture.

  The slide body (loading platform) 6 is slidably attached to the lift frame 3 described above, and a chain (not shown) is suspended and moves linearly along the lift frame 3. A tread board 8 is provided at the rear end of the slide body 6. The tread board 8 is attached to the rear end of the slide body 6 via a hinge (not shown), and can swing with respect to the main body portion of the slide body 6.

  A gate-shaped reinforcing frame 34 is provided at the front end of the slide body (loading platform) 6. A rear warning device 33 is attached to the back side of the reinforcing frame 34. The rear warning device 33 is specifically a hazard lamp, a reflector, or the like, and is a device that notifies the vehicle or the like approaching from the rear of the vehicle loaded vehicle 1.

When the vehicle 1 is traveling, the lift frame 3 is in a horizontal posture as shown in FIG. 1, and the slide body (loading platform) 6 is pulled up on the lift frame 3. The tread plate 8 provided on the slide body 6 travels in an upright state.
When loading and unloading the vehicle, after lowering the bumper 14 as shown in FIG. 2, the slide body (loading part) 6 is moved to the rear end side of the vehicle as shown in FIG. Raise up to the maximum angle.
Then, the slide body (loading platform) 6 is further moved to the rear side of the vehicle, and the slide body (loading platform) 6 is landed on the ground at the rear end as shown in FIG. 5, and the slide body (loading platform) 6 is lowered.
When the entire bottom surface of the slide body (loading section) 6 has landed as shown in FIG. 6, the tread plate 8 is placed in a horizontal posture as shown in FIG. 8, and the vehicle is carried in or out.

A bumper device 10 is attached to the rear end portion of the vehicle-mounted vehicle 1. The bumper device 10 includes a lifting device 100 and a bumper 14. A spare tire 101 is attached to the lifting device 100 with a bolt (not shown). A hazard lamp (rear warning member) 56 is attached to the bumper 14 as shown in each figure (b).
The lifting device 100 of the bumper device 10 employs a parallel link as will be described later, and can move the bumper 14 and the spare tire 101 in parallel.
That is, the bumper 14 can be moved from the traveling position as shown in FIG. 1 to the working position as shown in FIG. In the traveling position, the bumper 14 protrudes rearward of the vehicle loaded vehicle 1 and has a height close to the loading platform. The spare tire 101 is within the projected area of the vehicle body, and is at the lower part of the cargo bed and close to the cargo bed.
On the other hand, the working position is on the front side of the vehicle, and its height is extremely low near the ground.
The height of the bumper and spare tire 101 at the working position is preferably as low as possible, and ideally is near the ground as described above. In other words, when the height of the bumper at the working position is not much different from the position at the time of traveling, specifically, when the difference between the two is less than twice, the rear warning device on the bumper side only by slightly tilting the lift frame 3 56 is hidden. Also, when removing the spare tire 101, the spare tire 101 should have a low height.

Next, operation | movement of the vehicle loading vehicle 1 is demonstrated along a daily work procedure.
For example, in the case of collecting a failed vehicle stopped on the road, the vehicle-loaded vehicle 1 is driven in the state shown in FIG.
That is, the lift frame 3 is set in a horizontal posture, and the slide body (loading platform) 6 is pulled up on the lift frame 3. The tread board 8 provided on the slide body 6 is in an upright state.
The bumper 14 is in the traveling position. That is, the bumper 14 is fixed at a height close to the loading platform.

  When the vehicle arrives at the site, the rear warning device 33 provided on the slide body (loading platform) 6 and the rear warning member 56 attached to the bumper 14 are turned on. Specifically, each of the rear warning devices 33 and 56 is a hazard lamp, and is a yellow electric lamp that blinks at a constant interval.

  When the state at this time is observed from the rear, it is as shown in FIG. That is, the rear warning device 33 provided on the slide body 6 is in a state where it is difficult to confirm from the rear due to the tread 8 being in the way, but the rear warning member 56 attached to the bumper 14 can be clearly seen, A vehicle approaching from behind can know the presence of the vehicle-loaded vehicle 1.

And a driver | operator drives the raising / lowering apparatus 100 of the bumper apparatus 10 by predetermined | prescribed operation, and moves the bumper 14 to the working position like FIG. That is, the height of the bumper 14 is lowered and the bumper 14 is moved to a position close to the ground.
At this time, in this embodiment, since the bumper 14 is moved using the parallel link, the posture of the bumper 14 does not change during and after the movement. Therefore, the rear warning member 56 attached to the bumper 14 always faces backward.
When the state at this time is observed from the rear, it is as shown in FIG. That is, the rear warning device 33 provided on the slide body 6 is still in a state where it is difficult to confirm from the rear because the tread plate 8 is in the way, but the rear warning member 56 attached to the bumper 14 can be clearly seen. A vehicle approaching from the rear can know the presence of the vehicle 1.

Subsequently, as shown in FIG. 3, the slide body (loading platform) 6 is moved to the vehicle rear end side, and the lift frame 3 is tilted.
When the state at this time is observed from the rear, as shown in FIG. 3B, the lift frame 3 is inclined and the front side of the slide body (loading part) 6 is lifted. As a result, the height of the rear warning device 33 attached to the slide body (loading part) 6 exceeds the height of the tread board 8, and the rear warning device 33 can be confirmed from the rear.
In the state of FIG. 3, the angle of the lift frame 3 does not reach the maximum angle, and there is a gap between the slide body 6 and the ground. Therefore, the rear warning member 56 attached to the bumper 14 can also be visually recognized from the rear.

  If the lift frame 3 is further inclined and the rear end of the slide body (loading part) 6 lands as shown in FIG. 4, the rear warning member 56 attached to the bumper 14 is hidden as shown in FIG. 4B. The rear warning device 33 attached to the slide body (loading part) 6 can be confirmed from the rear.

  Thereafter, as shown in FIG. 5, the slide body 6 is lowered by landing the slide body 6 on the ground at the rear end. In this state, the slide body 6 is inclined and the rear warning device attached to the slide body 6. Since the height of 33 exceeds the height of the tread board 8, the rear warning device 33 can be confirmed from behind.

Then, after the entire area of the slide body (loading part) 6 is landed on the ground as shown in FIG. 6, the tread 8 is brought into a horizontal posture as shown in FIG.
When the tread board 8 is set to the horizontal posture, there is no obstacle blocking the rear warning device 33 attached to the slide body 6, so that the rear warning device 33 can be confirmed from behind.

Next, an operation procedure when the tire of the vehicle-mounted vehicle 1 is punctured will be described.
When the tire of the vehicle-mounted vehicle 1 is punctured during traveling, the vehicle-loaded vehicle 1 is stopped on the road shoulder and stopped as usual. Of course, the rear warning device 33 provided on the slide body 6 and the rear warning member 56 attached to the bumper 14 are turned on to notify the subsequent vehicle that the vehicle-loaded vehicle 1 is stopped.
Then, the spare tire 101 attached to the lifting device 100 of the bumper device 10 is lowered.
Specifically, an operation for moving the bumper 14 to the working position is performed, and the spare tire 101 is lowered together with the bumper 14.
Then, a bolt (not shown) is removed, and the spare tire 101 is removed from the lifting device 100.

Subsequently, the vehicle is lifted with a jack or the like (not shown), the punctured tire is removed, and a spare tire is attached to the axle to change the tire.
Then, the punctured tire is attached to the lifting device 100. Thereafter, the lifting device 100 is activated to raise the bumper 14 to the traveling position, and the punctured tire together with the bumper 14 is raised.

The general configuration and operational effects of the transport vehicle of the present invention have been described above. Next, the specific configuration of the bumper device 10 and the lifting device 100 as a component member of the bumper device will be described.
The bumper device 10 is attached to the rear end portion of the vehicle transport vehicle 7 described above.
Although the bumper device 10 is provided with a three-dimensional link mechanism as will be described later in actual design, the structure of the bumper device 10 will be described with a planar skeleton diagram for easy understanding.

(Embodiment 1)
8 and 9 are front views of the bumper device according to the first embodiment of the present invention. FIG. 8 shows a state when the bumper is in the working position, and FIG. 9 shows the bumper in the traveling position. The state of time is shown.
10 to 12 are skeleton diagrams of the bumper device according to the first embodiment of the first embodiment of the present invention. FIG. 10 shows a state when the bumper is in the working position, and FIG. FIG. 12 shows a state when the bumper is in the traveling position.

The bumper device 10 according to this embodiment includes a lifting device 100, a bumper 14, and a spare tire 101. The lifting device 100 includes a bumper drive unit 11, a reverse rotation prevention mechanism unit 12, and a power unit 13. A bumper 14 and a roller 19 are attached to the bumper drive unit 11 of the lifting device 100. A spare tire 100 is attached to the bumper drive unit 11.
The bumper 14 is made by pressing steel in the same manner as a known one, and is attached with a reflector, a hazard lamp, and the like. The roller 19 is a rubber wheel that freely rotates.

In the present embodiment, the bumper drive unit 11 of the lifting device 100 is a chain mechanism that includes a swing arm 15, a bumper arm 16, an auxiliary connecting member 17, and a fixing member 18. That is, the lifting device 100 has a link mechanism that includes the swing arm 15, the bumper arm 16, the auxiliary connecting member 17, and the fixing member 18. Moreover, this Renk mechanism actually has a three-dimensional structure as will be described later.
The fixing member 18 constituting the link mechanism is a member welded to the rear portion of the subframe 7 of the track 1 and is integral with the subframe 7 of the track 1 and does not relatively move.
The bumper arm 16 has a bumper 14 attached to the tip thereof. A spare tire 101 is fixed to the bumper arm 16 with a bolt or the like (not shown).
The swing arm 15 is attached to the fixed member 18 by a pin 20, and the proximal end side of the swing arm 15 can swing with respect to the fixed member 18.
Further, the base end portion of the bumper arm 16 is connected to the tip end side of the swing arm 15 via a pin 21.
The swing arm 15 is provided with a grounding member 24. The grounding member 24 is integrally attached to the swing arm 15, and when the bumper device 10 is in a working posture as shown in FIGS. 8 and 10, the column portion 24 a of the grounding member 24 is in a substantially vertical posture. .

  An auxiliary connecting member 17 is attached between the intermediate portion of the bumper arm 16 and the fixing member 18. The coupling between the bumper arm 16 and the auxiliary coupling member 17 and the coupling between the fixing member 18 and the auxiliary coupling member 17 are both performed by pins 22 and 23.

In the bumper drive unit 11 of the lifting device 100, the swing arm 15, a part of the bumper arm 16, the auxiliary connecting member 17 and the fixing member 18 form a substantially parallel link. That is, the length between the pins 20 and 21 of the swing arm 15 is equal to the length between the pins 22 and 23 of the auxiliary connecting member 17 which is an opposing element.
Further, the length between the pins 20 and 23 of the fixing member 18 is equal to the length between the pins 21 and 22 of the bumper arm 16 which is an opposing element. In addition, between the pins 20 and 23 of the fixing member 18 is parallel to the vehicle body 4 of the truck 1, and when the truck 1 is stopped on a horizontal plane, the pins 20 and 23 of the fixing member 18 are horizontal.

  In the present embodiment, as described above, the swing arm 15, a part of the bumper arm 16, the auxiliary connecting member 17, and the fixing member 18 form a substantially parallel link. When one element is exercised, the other elements exercise limitedly. Further, as described above, the bumper drive unit 11 forms a parallel link, and the pins 20 and 23 of the fixing member 18 are parallel to the vehicle body 4 of the truck 1. During this time, the vehicle always moves in a parallel posture with respect to the vehicle body 4 of the truck 1.

When the swing arm 15 is suspended as shown in FIGS. 8 and 10, the position of the bumper arm 16 is on the lower side in the vertical direction and on the front side in the front-rear direction of the track 1.
When the inclination posture of the swing arm 15 is changed, the position of the bumper arm 16 gradually rises and moves backward in the front-rear direction of the track 1.

Next, the reverse rotation prevention mechanism unit 12 and the power unit 13 of the lifting device 100 will be described.
The reverse rotation prevention mechanism unit 12 includes a rotation member 25 and a connecting link 26. The rotating member 25 is attached to the subframe 7 of the track 1 by a pin 28 and rotates around the pin 28. The shape of the rotating member 25 is substantially triangular, and a fan-shaped concave portion 37 is provided on one side. There is a small recess 36 in the long side. The concave portion 36 functions as an engaging portion, and is in a position where it can engage with a part of the slide body (loading portion) 6 during traveling, as will be described later.
The power unit 13 has a hydraulic cylinder 27 (drive source) as a main member.

In the present embodiment, a connecting link 26 is provided between the rotation member 25 of the reverse rotation prevention mechanism unit 12 and the bumper driving unit 11, and the rotation member 25 has a rod 30 of the hydraulic cylinder 27 of the power unit 13. Is connected.
That is, the base end portion of the connecting link 26 is rotatably connected to a part of the rotating member 25 via the pin 29, and the tip end portion of the connecting link 26 is connected to the swing arm of the bumper driving unit 11 via the pin 31. 15 is connected to the middle part.
The hydraulic cylinder 27 is attached to the subframe 7 of the track 1 on the cylinder end side via a pin 32, and the tip of the rod 30 is attached to the rotating member 25 via a pin 35.

Here, the bumper device 10 of the present embodiment is characterized in the mounting positional relationship and mounting angle between the rotating member 25 and other members.
That is, in the bumper device 10 of the present embodiment, the rotating member 25 is rotated by expanding and contracting the rod 30 of the hydraulic cylinder 27, and the connecting link 26 is moved according to the rotation of the rotating member 25. The bumper drive unit 11 is moved by changing the inclination angle of the bumper 14 to move the bumper 14 and the spare tire 101. While the bumper 14 and the spare tire 101 perform a series of moving operations, the rotating member 25 Rotates beyond the point of thought.

Next, attachment positions of the rotating member 25 and other members will be described.
13 to 15 are skeleton diagrams in which the part of the rotating member 25 is enlarged in the skeleton diagram of the bumper device illustrated in FIGS. 10 to 12. FIG. 13 illustrates a state when the bumper is in the working position. FIG. 14 shows a state where the bumper is halfway from the working position to the traveling position, and FIG. 15 shows a state when the bumper is in the traveling position.

Briefly, when the bumper 14 is in the working position (FIG. 13) when virtually divided into upper and lower areas A and B with the rotation center (pin) 28 of the rotating member 25 as a boundary, the hydraulic pressure The position of the pin 35 on the cylinder 27 side and the position of the pin 29 on the swing arm 15 side are in different regions. That is, at this time, the position of the pin 35 on the hydraulic cylinder 27 side is in the region B below the rotation center (pin) 28, and the pin 29 on the swing arm 15 side is above the rotation center (pin) 28. In region A.
Therefore, when the hydraulic cylinder 27 contracts, torque is applied to the rotating member 25 in the direction of arrow E (the direction of arrow E may be referred to as the positive direction in the description). Further, the reaction force from the bumper 14 side (the connecting link 26) gives a torque in the direction opposite to the arrow E direction to the rotating member 25.

  More precisely, the vector a generated when the hydraulic cylinder 27 contracts passes through the lower area D with the rotation center (pin) 28 as a boundary when the vector a is extended. On the other hand, the reaction force vector b from the bumper 14 and spare tire 101 side passes through the opposite area C with the rotation center (pin) 28 as a boundary. In this way, the vector a generated by the hydraulic cylinder 27 and the reaction force vector b from the spare tire 101 side pass through opposite regions with the rotation center (pin) 28 as a boundary. The force gives the rotating member 25 a torque in the direction opposite to the direction of the arrow E.

  On the other hand, when the bumper 14 and the spare tire 101 are in the running position, the above-described relationship is lost, and the position of the pin 35 on the hydraulic cylinder 27 side and the pin 29 on the swing arm 15 side as shown in FIG. The position is in the same area. That is, at this time, the position of the pin 35 on the hydraulic cylinder 27 side is in the region B below the rotation center (pin) 28, and the pin 29 on the swing arm 15 side is also below the rotation center (pin) 28. It is in the area B on the side.

  More specifically, the vector a generated when the hydraulic cylinder 27 contracts passes through the lower area D with the rotation center (pin) 28 as a boundary when extended, and from the bumper 14 and spare tire 101 side. The reaction force vector also passes through the same area D with the rotation center (pin) 28 as a boundary. Thus, the vector a generated by the hydraulic cylinder 27 and the vector b of the reaction force from the spare tire 101 pass through the same region with the rotation center (pin) 28 as a boundary. Applies a torque in the same direction as the arrow E direction to the rotating member 25.

During this time, the rotating member 25 passes the thought point. The thought point is that the rotating member 25 can rotate both forward and backward with respect to the force received from the bumper 14 and the spare tire 101 side.
The thought point is a position where the position of the pin 29 on the swing arm 15 side reaches the vicinity of the height of the rotation center (pin) 28 as shown in FIG. More precisely, the extension line of the connecting link 26 is a position passing through the rotation center (pin) 28. That is, in actuality, since both the position and the inclination angle of the connecting link 26 change, the exact thought point cannot be specified only by the position of the pin 29, the position of the pin 29 moves up and down, and the swing arm 15 further moves. The position where the extension line of the connecting link 26 passes through the rotation center (pin) 28 is a thought point.

Next, the main operation of the bumper device 10 of this embodiment will be described.
8 and 10 show the state when the bumper is in the working position as described above. In this state, the bumper 14 is located at the lowest position in the up-down direction and is on the front side in the front-rear direction of the track 1. That is, the bumper 14 and the spare tire 101 are located in the vicinity of the ground in the orthographic projection plane of the body of the truck 1. Therefore, the bumper 14 and the spare tire 101 do not get in the way when the vehicle is loaded or lowered.
At this time, the posture of the swing arm 15 is in a suspended state. That is, the tip-side pin 21 is in the lower position. Moreover, the rotation member 25 has a posture in which a triangular projecting portion sinks into the loading platform.

Turning to the power unit 13, the hydraulic cylinder 27 is in a state where the rod 30 is extended.
When the bumper 14 and the spare tire 101 are moved to the travel position from this state, the rod 30 of the hydraulic cylinder 27 is contracted. As a result, the rotating member 25 rotates in the arrow E direction around the pin 28.

When the rotation member 25 rotates in the direction of arrow E, the connecting link 26 connected to the rotation member 25 is pushed out to the bumper 14 side (vehicle rear side).
For this reason, the connecting link 26 pushes the middle part of the swing arm 15 toward the bumper 14 (rear side of the vehicle) and tilts the swing arm 15.
Here, as described above, the swing arm 15 forms a parallel link together with the bumper arm 16, the auxiliary connecting member 17 and the fixing member 18, so that the auxiliary connecting member 17 tilts as the swing arm 15 tilts. The bumper arm 16 is pushed to the rear of the track 1. The bumper arm 16 also rises in the height direction. Along with this, the spare tire 101 also rises.

As a result, the bumper 14 protrudes toward the rear end side of the truck 1, and its height approaches the vicinity of the vehicle body 4, and finally reaches the traveling position. Specifically, the bumper 14 protrudes further rearward from the rear end of the vehicle in the length direction of the vehicle, and stops near the vehicle body 4 in the height direction.
The height of the spare tire 101 also approaches the vicinity of the vehicle body 4. However, the position of the spare tire 101 in the front-rear direction is within the orthographic projection plane of the body.
Further, during these series of operations, the rotating member 25 rotates beyond the thought point.
When the rod 30 of the hydraulic cylinder 27 is fully retracted, the bumper 14 and the spare tire 101 have reached positions suitable for traveling.

In normal work, the truck starts to run.
Here, the load applied to the bumper 14 and the spare tire 101 during traveling is a vertical load due to gravity or the like and a horizontal load due to inertia during traveling or braking.
In any case, these loads act to direct the bumper 14 and the spare tire 101 from the travel position to the work position. More specifically, the traveling force acts in a direction in which the swing arm 15 is in the hanging posture, and acts in a direction to push the connecting link 26 back to the cylinder 27 side.

Here, when the positional relationship between the rotating member 25 and the other members at the traveling position is confirmed again, the rotating member 25 exceeds the thought point during the period from the working position to the traveling position. When the spare tire 101 is in the traveling position, the position of the pin 35 on the cylinder 27 side and the position of the pin 29 on the swing arm 15 side are in the same region. More precisely, the vector of the connecting link 26 passes through the lower area D with the rotation center (pin) 28 as a boundary, and the vector generated when the cylinder 27 side functions in the contraction direction is also the rotation center (pin). It passes through the lower area D with 28 as a boundary. Therefore, this force acts in the direction in which the cylinder 27 is contracted. However, when the bumper 14 and the spare tire 101 are in the travel position, the rod 30 of the hydraulic cylinder 27 is already contracted, so the hydraulic cylinder 27 cannot be contracted any further, and the rotating member 25 is locked.
Therefore, the bumper 14 and the spare tire 101 do not move.

When the vehicle is loaded or when the tire is punctured and replaced with the spare tire 101, the rear warning device 33 attached to the rear of the cab 9 and the hazard lamp attached to the bumper 14 are turned on. Stop 1 Then, hydraulic pressure is supplied to the cylinder 27 to extend the rod 30.
As a result, the rotating member 25 rotates in the direction opposite to the arrow E, contrary to the previous operation, and the connecting link 26 moves by the rotation of the rotating member 25. Then, the swing arm 15 changes from the horizontal posture to the vertical posture, and the bumper 14 and the spare tire 101 are lowered.

  Here, in this embodiment, the swing arm 15, a part of the bumper arm 16, the auxiliary connecting member 17 and the fixing member 18 form a substantially parallel link, and between the pins 20 and 23 of the fixing member 18. Is parallel to the vehicle body of the truck 1, the bumper 14 and the spare tire 101 always move in a horizontal posture. Therefore, a rear warning device such as a hazard lamp attached to the bumper 14 always maintains a posture facing backward. Therefore, the vehicle coming from behind can confirm the presence of the truck (vehicle carrier) 1.

Thereafter, similarly to the known vehicle transporter, the slide body (loading part) 6 is moved to the rear end side of the vehicle, the lift frame 3 is tilted, and the slide body (loading part) 6 is further moved to the rear side of the vehicle so as to be on the ground. Land.
When the entire bottom surface of the slide body (loading part) 6 has landed, the tread plate 8 is placed in a horizontal posture as shown in FIG. 7, and the vehicle is carried in or out.

Next, detailed operation of the bumper device of the present embodiment will be described.
In the bumper device 10 of this embodiment, the grounding member 24 is provided on the swing arm 15 as described above. The grounding member 24 is a columnar member and is attached to a part of the swing arm 15. The grounding member 24 moves integrally with the swing arm 15, and when the swing arm 15 is in the suspended state, the grounding member 24 is in a posture facing the top-and-bottom direction.
The lower end of the ground member 24 is positioned below the tip of the swing arm 15 when the swing arm 15 is in the suspended state.

The function of the grounding member 24 is to prevent the front wheel of the truck 1 from floating.
That is, the truck (vehicle transport vehicle) 1 is for loading a vehicle having a considerable weight, and the slide body (loading section) 6 moves in the axial direction. Therefore, a local concentrated load may be applied to the vehicle body 4 of the truck 1. If the position where the concentrated load is applied is between the front and rear wheel trains, there is no major problem. However, if the load is applied further rearward than the rear train wheels, the entire track looks like a seesaw. May swing around the fulcrum and the front row wheels may float.
Therefore, in the present invention, the grounding member 24 is provided on the swing arm 15 of the bumper device 10, and when the load is applied and the rear wheel side sinks, the grounding member 24 is landed on the ground to support the load.

That is, in the bumper device 10 of the present embodiment, the bumper device 10 is caused to function in the case of unloading work and the bumper 14 is moved downward and forward. At this time, the swing arm 15 is in a posture facing the top-and-bottom direction. Therefore, the grounding member 24 is also in a downward state. When the truck 1 receives a load and the vehicle body 4 sinks, the grounding member 24 moves down together with the swing arm 15 and comes into contact with the ground. As a result, the load of the vehicle body 4 is directly applied to the grounding member 24 to prevent the vehicle body 4 from descending.
In particular, in the present embodiment, the grounding member 24 is attached to the swing arm 15, and the swing arm 15 is in a suspended posture during loading and unloading work. It can be borne directly as a compression weight. In other words, the load received by the grounding member 24 is straight in the axial direction and has few eccentric components. Therefore, the grounding member 24 is difficult to buckle and withstands a high load. Further, since the attachment portion of the swing arm 15 can be easily structured with high rigidity, a large load can be supported.

In the present embodiment, a special shape is adopted for the rotating member 25.
In other words, the essential function of the rotating member 25 is to transmit the force of the hydraulic cylinder 27 to the bumper drive unit 11 and limit the force in the reverse direction. It doesn't matter what it is. For example, it may be disk-shaped, quadrangular, or polygonal, such as a star shape.
In the bumper device 10 of the present embodiment, the triangular turning member 25 is used in order to prevent the vehicle loading device 2 from moving when the truck 1 is traveling.
That is, as described above, the vehicle loading device 2 has the slide frame (loading section) 6 attached to the lift frame 3, and the slide body 6 moves during work.
On the other hand, during travel, the slide body (loading platform) 6 is fixed so as not to move by a locking means (not shown).

However. In the unlikely event that this locking means is out of order and the slide body (loading platform) 6 moves during traveling and the slide body 6 falls off, it may lead to a major accident.
Therefore, in the present embodiment, during traveling, the protruding end of the rotating member 25 is protruded toward the vehicle body 4 side.
The slide body (loading platform) 6 has a floor surface made of expanded metal, punching metal, or the like, but an aggregate that supports the floor is provided on the back side. In the bumper device 10 of the present embodiment, the posture of the rotating member 25 is a posture in which the protrusion side (engagement portion 36 side) is up and the engagement portion 36 is directed forward during traveling. Therefore, even if the slide body (loading part) 6 is unlocked and the slide body (loading part) 6 moves, the aggregate provided on the back side collides with the protrusion side (engaging part 36), and the slide body ( (Loading part) 6 is stopped. Therefore, even if the locking means of the slide body (loading part) 6 breaks down, there is no risk that the slide body (loading part) 6 will drop off.

  During the work, the bumper 14 is lowered as described above. At that time, the rotating member 25 is rotated, and the protrusion side (engaging portion 36) is sunk in the lower part. Therefore, the protrusion of the rotating member 25 does not get in the way when moving the slide body (loading platform) 6.

(Embodiment 2)
Next, a second embodiment of the invention will be described.
Since the difference between the second embodiment described below and the first embodiment described above is only the bumper drive unit, the description focuses on the points different from the previous embodiment, and the same part is The same numbers are attached to the drawings, and detailed description is omitted.
16 to 18 are skeleton diagrams of the bumper device according to the second embodiment of the present invention. FIG. 16 shows a state when the bumper is in the working position, and FIG. 17 shows the bumper from the working position to the traveling position. FIG. 18 shows a state when the bumper is in the traveling position.
FIG. 19 is a skeleton diagram of the bumper device according to the second embodiment of the present invention, and shows the behavior when it collides with an obstacle. FIG. 20 is a cross-sectional view of an auxiliary connecting member employed in the bumper device of the second embodiment. FIG. 21 is a front view showing a modified example of the auxiliary connecting member.

In the bumper device 10 of the first embodiment described above, the bumper drive unit 11 of the lifting device 100 is configured by a parallel link. That is, in the previous embodiment, the bumper driving unit 11 is a limited chain, and each element always translates with respect to the opposing element.
On the other hand, the bumper device 40 according to the second embodiment described below has a degree of freedom in the upward direction for the movement of the bumper arm 16. In this embodiment as well, the spare tire 101 is fixed to the bumper arm 16 with a bolt or the like (not shown).
In the bumper device 40 of the present embodiment, the auxiliary connecting member 41 has elasticity. More specifically, the auxiliary connecting member 41 has a degree of freedom only in the shrinking direction, prevents the distance between the bumper arm 16 and the fixing member 18 from exceeding a certain distance, and reduces the distance between the two. It is acceptable.

The specific structure of the auxiliary connecting member 41 is as shown in FIG. The auxiliary connecting member 41 is divided into an upper side shaft 44 and a lower side shaft 47, and a shock absorber 43 is provided at an intermediate portion thereof. The shock absorber 43 includes a housing 45 and a spring 52.
A guide member 46 is provided inside the housing 45 of the shock absorber 43, and an opening communicating with the guide member 46 and the lower surface of the housing 45 is provided.
The lower shaft 47 is partially formed with a screw 49, and a nut 48 is fitted to the screw 49. A sliding ring 50 and a sliding collar 51 are slidably mounted on the lower shaft 47.

The above-described upper shaft 44 is attached to the upper side of the housing 45 of the shock absorber 43.
The upper end of the lower shaft 47 is inserted into the lower side of the shock absorber 43. That is, the upper end portion of the lower shaft 47 communicates with the lower surface of the housing 45 and the opening provided in the guide member 46. The upper end of the lower shaft 47 protrudes further above the guide member 46, and a known C-ring 54 is mounted. Therefore, the lower shaft 47 does not fall out of the shock absorber 43.

  Further, a sliding ring 50 is attached to a portion near the upper end of the lower shaft 47 and surrounded by the guide member 46 and the lower surface of the housing 45. The sliding ring 50 can slide with respect to the lower shaft 47. Further, a sliding collar 51 is attached to the lower part of the sliding ring 50. Here, the sliding ring 50 has a larger diameter than the opening provided in the housing 45, and the sliding collar 51 has a smaller diameter than the opening provided in the housing 45. Therefore, the sliding collar 51 can slide over the inside and outside of the housing 45, but the sliding ring 50 stops in the housing 45.

The sliding collar 51 is in contact with the nut 48. The nut 48 is fitted with a screw 49 formed on the lower shaft 47.
Therefore, when the nut 48 is rotated to move the position of the nut 48, the sliding collar 51 and the sliding ring 50 move.

A spring 52 is provided between the sliding ring 50 and the guide member 46.
Therefore, the auxiliary connecting member 41 maintains a certain length when the spring 52 presses the sliding ring 50 of the lower shaft 47 against the lower surface of the housing 45 when no load is applied.
When a force in the pulling direction is applied to the auxiliary connecting member 41, the C ring 54 contacts the guide member 46 of the housing 45, so that the auxiliary connecting member 41 does not extend beyond a certain length.
On the other hand, when the auxiliary connecting member 41 is compressed, the sliding ring 50 moves toward the guide member 46 against the force of the spring 52 and the entire length is reduced.
When the nut 48 is rotated to move the position of the nut 48 and the sliding ring 50 is moved, the entire length of the spring 52 at the time of no load expands and contracts, and the force of the spring 52 can be adjusted.

  The auxiliary connecting member 41 is attached to the fixing member 18 at the tip of the upper shaft 44 via the pin 23. The tip of the lower side shaft 47 of the auxiliary connecting member 41 is connected to the intermediate portion of the bumper arm 16 via the pin 22.

The bumper device 40 according to the present embodiment deals with a case where there is an obstacle in the lower portion, and has a function of preventing the device from being destroyed. That is, when the vehicle is loaded, the rod 30 is extended by supplying hydraulic pressure to the cylinder 27 of the bumper device 40 as described above.
As a result, the swing arm 15 changes from a horizontal posture to a vertical posture, and the bumper arm 16 descends. At this time, the load (gravity load) of the bumper arm 16 is applied downward, and a tensile force is applied to the auxiliary connecting member 41. Therefore, the auxiliary connecting member 41 is in the most extended state, and the swing arm 15, a part of the bumper arm 16, the auxiliary connecting member 41 and the fixing member 18 form a substantially parallel link. Therefore, the bumper arm 16 always descends while maintaining a horizontal posture.

Here, when there are stones, car stops, curbs, etc. on the ground surface, the bumper 14 or the bumper arm 16 may hit them. Here, in the bumper device 40 of the present embodiment, since the auxiliary connecting member 41 has a degree of freedom in the contraction direction, the bumper 14 or the bumper arm 16 escapes upward.
That is, the bumper device 40 of the present embodiment has a function of escaping upward when the bumper 14 or the like receives a force from below. Therefore, the bumper device 40 is not damaged even if there is an obstacle at the bumper destination.

Further, in the bumper device 40 of the present embodiment, since the buffer device 43 is provided in the auxiliary connecting member 41 that is a part of the bumper drive unit 11, vibration of the bumper device 40 during traveling of the vehicle can be reduced. That is, when the vehicle is running, the bumper device 40 is moved to the running position as shown in FIG. 18, but the bumper device 40 is in a cantilever support state and is driven by the vertical movement of the vehicle during running. The part 11 is rolled up and down. However, in this embodiment, since the shock absorber 43 is provided in a part of the bumper drive unit 11, the vertical movement of the vehicle is not transmitted directly, and the bumper drive unit 11 is stabilized.
The strength of the shock absorber 43 can be adjusted by rotating the nut 48 to change the force of the spring 52.

  In the bumper device 40 of this embodiment, the grounding member 24 is provided on the swing arm 15. In the bumper device 40 of this embodiment, as described above, when the bumper 14 or the like receives a force from below, they have a function of escaping upward. However, even if a load is applied to the ground member 24, the ground member 24 Never run away. That is, in the present embodiment, the bumper arm 16 has a degree of freedom in the swing direction, but the swing arm 15 does not expand and contract, and the grounding member 24 is attached to the swing arm 15. Can support vertical loads. Therefore, when a local concentrated load is applied to the vehicle body 4 of the truck 1, this load can be supported, and the front wheel can be prevented from being lifted.

Further, in the present embodiment, the shock absorber 43 having only the spring 52 is illustrated, but a higher function shock absorber such as one having a damper may be used.
Conversely, the shock absorber may be omitted. That is, in the present embodiment, the auxiliary connecting member 41 having a built-in spring is exemplified, but a wire 53 such as a wire or a rope as shown in FIG. 21 may be used. Moreover, it may be a chain or a chain instead of a wire or the like.
In short, any auxiliary connecting member 41 according to the second embodiment can be used as long as the member has the ability to withstand a tensile force and has a degree of freedom in the shrinking direction.
FIG. 22 is a modified example of the bumper device according to the second embodiment of the present invention, and is a skeleton diagram in the case where a wire is employed as the auxiliary connecting member, and shows a state where the bumper is in the working position. FIG. 23 is a modified example of the bumper device according to the second embodiment of the present invention, and is a skeleton diagram in the case where a wire is employed as an auxiliary connecting member, and shows the behavior when it collides with an obstacle.

  Also in the bumper device 40 ′ shown in FIGS. 22 and 23, the wire 53 as the auxiliary connecting member is a member that can withstand the tensile force, and therefore can support the load (gravity load) of the bumper arm 16, and the bumper drive unit 11 can be When operating, the swing arm 15, a part of the bumper arm 16, the auxiliary connecting member (wire 53), and the fixing member 18 form a substantially parallel link. Therefore, the bumper arm 16 always descends while maintaining a horizontal posture.

  When the bumper 14 is lowered, if it hits a curb or the like, the wire 53 is loosened as shown in FIG. 23 and the bumper 14 or the bumper arm 16 escapes upward. Therefore, the bumper device 40 'is not damaged even if there is an obstacle at the bumper descent destination.

  In this embodiment, the bumper 14 and the spare tire 101 do not move during traveling. That is, when the vehicle is driven, the bumper 14 is moved to a predetermined position. Also in this embodiment, the bumper 14 moves upward and backward, and the rotating member 25 is considered while the vehicle moves from the working position to the traveling position. Since the point is exceeded, the rotation member 25 is locked. Therefore, the bumper 14 and the spare tire 101 do not move due to vibration during traveling.

(Embodiment 3)
Next, a third embodiment of the invention will be described.
Also in the third embodiment, since the difference from the first embodiment described above is only the bumper driving unit, the description will be focused on the point different from the previous embodiment, and the same parts are illustrated in the drawings. The same number is attached to and detailed description is omitted.
23 to 26 are skeleton diagrams of the bumper device according to the third embodiment of the present invention. FIG. 24 shows a state when the bumper is in the working position. FIG. 20 shows the bumper from the working position to the traveling position. FIG. 26 shows a state when the bumper is in the traveling position.
FIG. 27 is a perspective view of the engaging means employed in the third embodiment of the present invention.
28 to 30 are explanatory views showing the operation of the bumper device according to the third embodiment of the present invention. FIG. 28 shows the state when the bumper is in the working position, and FIG. 29 shows the bumper from the working position. FIG. 30 shows a state where the bumper is in the traveling position.

In the bumper device 10 of the first embodiment described above, the bumper drive unit 11 is configured by a parallel link, but in the third embodiment, the parallel link is omitted.
That is, the bumper device 55 of the present embodiment has no equivalent to the auxiliary connecting member. In place of this, an engaging means 57 is provided.

The engaging means 57 is constituted by the end face of the swing arm 15 as shown in FIGS. That is, the swing arm 15 and the bumper arm 16 are each made of a square pipe as shown in FIG. The swing arm 15 and the bumper arm 16 are connected to the hinge member 56 at the corners on the bent side.
Therefore, the bumper arm 16 can swing from a parallel posture to a substantially linear posture with respect to the swing arm 15, but when both of them are in a substantially straight posture, the portions facing the hinge members 56 of the both are in contact with each other. The square pipes are in contact with each other. Therefore, the bumper arm 16 cannot have an angle wider than 180 ° in relation to the swing arm 15.
In this embodiment as well, the spare tire 101 is fixed to the bumper arm 16 with a bolt or the like (not shown).

Next, the operation of the bumper device 55 of this embodiment will be described. Also in the bumper device 55 of the present embodiment, the bumper 14 and the spare tire 101 are moved up and down by extending and contracting the hydraulic cylinder 27 of the power unit 13. The operations of the power unit 13 and the reverse rotation prevention mechanism unit 12 are the same as in the previous embodiment.
24 and 27 show a state where the bumper 14 and the spare tire 101 are in the working position as described above. The posture of the swing arm 15 at this time is a suspended state, and the lower end of the swing arm 15 is in the vicinity of the ground.
On the other hand, the roller 19 near the tip of the bumper arm 16 is grounded. Since the swing arm 15 and the bumper arm 16 are coupled by the hinge member 56, the swing arm 15 and the bumper arm 16 are joined at an angle of about 90 °. Further, as described above, the front end portion of the bumper arm 16 (the rear end side with respect to the vehicle) is grounded to the ground by the roller 19, and the swinging arm 15 is also suspended in the hinge member 56 on the other end side. The lower end of the swing arm 15 is in the vicinity of the ground. Therefore, both ends of the bumper arm 16 are near the ground surface, and the bumper arm 16 is in a substantially horizontal posture.

As a result of the rotation of the rotating member 25 in the direction of arrow E, the connecting link 26 connected thereto is pushed out to the bumper 14 side.
Therefore, the connecting link 26 pushes the intermediate portion of the swing arm 15 toward the bumper 14 and tilts the swing arm 15.
That is, the swing arm 15 swings while drawing an arc locus around the pin 20, and the lower end of the swing arm 15 moves toward the rear of the vehicle and rises.

As described above, since the lower end of the swing arm 15 is coupled to the bumper arm 16 by the hinge member 56, the vehicle front side end portion of the bumper arm 16 moves and rises toward the rear of the vehicle. .
However, since the bumper arm 16 can swing with respect to the swing arm 15, the other end side (vehicle rear side) of the bumper arm 16 moves to the vehicle rear side while being grounded. Here, in this embodiment, since the roller 19 is attached to the other end side (vehicle rear side) of the bumper arm 16, even if the bumper arm 16 moves, it will not be damaged.

The angle between the swing arm 15 and the bumper arm 16 opens as the tilt posture of the swing arm 15 approaches horizontal.
When the inclination of the swing arm 15 advances and the swing arm 15 and the bumper arm 16 are in a straight line state, the end surfaces of the swing arm 15 and the bumper arm 16 are brought into contact with each other as shown in FIGS. That is, the end surface of the swing arm 15 that is the engaging means 57 and the end surface of the bumper arm 16 are in contact with each other, the opening degree of the swing arm 15 and the bumper arm 16 is restricted, and the space between the swing arm 15 and the bumper arm 16 is more than this. It will not open.

When the swing arm 15 is further inclined, the roller 19 on the rear side of the bumper arm 16 leaves the ground surface, and the bumper arm 16 is lifted as shown in FIGS. The bumper 14 protrudes toward the rear end side of the truck 1, and the height approaches the vicinity of the vehicle body 4.
In normal work, the truck is started to run. Also in this embodiment, since the bumper 14 moves upward and rearward and the rotating member 25 exceeds the point of thinking while the working position reaches the traveling position, the rotating member 25 is locked. Therefore, the bumper 14 and the spare tire 101 do not move due to vibration during traveling.

When the vehicle is loaded, the truck 1 is stopped, the hydraulic pressure is supplied to the cylinder 27, and the rod 30 is extended.
As a result, the rotating member 25 rotates in the direction opposite to the arrow E, contrary to the previous operation, and the connecting link 26 moves by the rotation of the rotating member 25. As a result, the swing arm 15 changes from the horizontal posture to the vertical posture, and the bumper 14 and the spare tire 101 reach the working position.

Specifically, the swing arm 15 moves from a horizontal posture to a vertical posture, and the bumper arm 16 swings integrally with the swing arm 15 at the beginning. When the roller 19 provided on the bumper arm 16 is installed, the roller 19 side of the bumper arm 16 cannot be further lowered, so that the bumper arm 16 and the swing arm 15 are separated from the hinge member 56 portion. Bends.
When the swing arm 15 further approaches the vertical posture, the bumper arm 16 is pulled toward the front side of the vehicle. Since the roller 19 is attached to the other end side (rear side of the vehicle) of the bumper arm 16, the bumper arm 16 is not damaged even when the bumper arm 16 is pulled toward the front side of the vehicle.

Further, the bumper device 55 of this embodiment also has a function of escaping upward when the bumper 14 or the like receives a force from below. Therefore, even if there is an obstacle at the bumper's descent, the bumper will not be damaged.
That is, the bumper arm 16 has a degree of freedom in the direction of reducing the opening angle with respect to the swing arm 15. Therefore, when the bumper arm 16 is lowered, if there are stones, car stoppers, curbs, etc. on the ground surface, the bumper 14 and the bumper arm 16 come into contact with the bumper arm 16. Escapes upwards.

  In the present embodiment, the end face of the swing arm 15 is made to function as the engaging means 57, but the function of the engaging means can also be exhibited by bringing another part into contact with the bumper arm 16. Further, another member can be attached to the swing arm to function as the engaging means.

As described above, the bumper device of the present invention has been described using the skeleton diagram. However, the bumper device actually mounted on the vehicle has a three-dimensional structure in order to ensure rigidity.
FIG. 31 is a perspective view of the bumper device according to the embodiment of the present invention. FIG. 32 is an exploded perspective view in which the main part of the bumper device shown in FIG. 31 is extracted. FIG. 33 is a cross-sectional view of a spare tire carrier employed in the bumper device of FIG.

  The bumper device shown in FIGS. 31 and 32 has the structure shown in the second embodiment (FIGS. 16 to 18), and the auxiliary connecting member 41 is provided with a shock absorber 43 in the intermediate portion.

  The bumper 14 is made of a steel pipe (round pipe). In the present embodiment, the bumper 14 has the steel pipes 60 arranged horizontally and two hazard lamp units 61 attached to the upper part. A known hazard lamp, a reflector, or the like is attached to the hazard lamp unit 61. The rollers 19 are rubber wheels that freely rotate, and are attached to both ends of the steel pipe 60.

  As described above, the bumper drive unit 11 is a chain mechanism that includes the swing arm 15, the bumper arm 16, the auxiliary connecting member 41, and the fixing member 18. In this embodiment, the swing arm 15, the bumper arm 16, the auxiliary connecting member 41 and the fixing member 18 are all composed of two sets of members, and these are partially coupled to form a three-dimensional structure. Yes.

  That is, the fixing member 18 is attached to the subframe 7 of the truck 1 via the loading platform 62, and in this embodiment, two sets are provided. Specifically, one set of fixing members 18 is provided at both ends of the loading platform 62, and each is constituted by two plates 63.

  The bumper arm 16 is constituted by two square pipes 65, and the bumper 14 described above is attached to both ends. In addition, two crosspieces 104 are provided on the upper surface of the bumper arm 16. Therefore, in this embodiment, the frame body 105 is configured by the two square pipes 65 and the bumper 14, and the above-described two crosspiece members 104 are provided on the upper surface of the frame body 105.

A spare tire carrier 108 is attached on the crosspiece member 104. The spare tire carrier 108 has a known structure, and holds the spare tire 101 by winding up a chain 112 (FIG. 33).
That is, the spare tire carrier 108 incorporates a chain drum and a gear mechanism 118 therein. A handle engaging portion 120 is provided on the outer surface of the spare tire carrier 108, and an internal gear mechanism 118 can be driven by engaging a handle (not shown) with the handle engaging portion 120. A hook (not shown) is provided at the tip of the chain 112.
The procedure for attaching the spare tire 101 is well known. The hook is engaged with the wheel of the tire, the handle is engaged with the handle engaging portion 120, the chain 112 is turned up by turning the handle, and the spare tire 101 is attached to the crosspiece member 104. Keep pressed.

  In the present embodiment, a spare tire 101 is arranged in a frame 105 constituted by two square pipes 65 and a bumper 14. Therefore, in the present embodiment, the spare tire 101 has few portions protruding from the upper surface side of the frame body 105. That is, in this embodiment, the spare tire 101 is accommodated in a space constituted by the two square pipes 65 and the bumper 14, and there is no useless space.

The swing arm 15 has two main members 66 made of square pipes, and the two main members 66 are connected by two crosspieces 67 and 68. Further, the two bars 67 and 68 are coupled to each other by a reinforcing member 69.
The ground member 24 is attached to the lower beam 68. Two sets of grounding members 24 are also provided in this embodiment. When the bumper device 40 is in the working position, the grounding member 24 takes a vertical posture as shown in FIGS. The grounding member 24 is also made of a square pipe, and a grounding plate 71 is attached to the tip.
The upper crosspiece 67 is provided with two continuous member attaching portions 75 at two locations.

In the swing arm 15, the two main members 66 are respectively attached to the fixed member 18 by the pins 20, and the proximal end side of the main member 66 of the swing arm 15 is swingable with respect to the fixed member 18. is there.
A proximal end portion of the bumper arm 16 is connected to the distal end side of the swing arm 15 via a hinge member 70.

  An auxiliary connecting member 41 is attached between the middle portion of each square pipe of the bumper arm 16 and the left and right fixing members 18. The coupling between the bumper arm 16 and the auxiliary coupling member 41 and the coupling between the fixing member 18 and the auxiliary coupling member 41 are both by pins 22 and 23.

The bumper drive unit 11 has a structure in which two parallel links are three-dimensionally joined. That is, a substantially parallel link is formed by the main member 66 of the swing arm 15, the one square pipe 65 of the bumper arm 16, the one fixing member 18, and the one auxiliary connecting member 41. There are two combinations.
The two parallel links are coupled by the two bars 67 and 68 that connect the main members 66 of the swing arm 15 and the bumper 14 that connects the two square pipes 65 of the bumper arm 16, resulting in a three-dimensional structure. Presents.

Next, the reverse rotation prevention mechanism unit 12 and the power unit 13 will be described.
As described above, the reverse rotation prevention mechanism unit 12 is constituted by the rotating member 25 and the connecting link 26, and these also have a three-dimensional structure. That is, the rotating member 25 is a plate member 72 having the same shape and spaced apart. The plate bodies 72 are all substantially triangular. The connecting link 26 is composed of two band irons.

Each plate 72 constituting the rotating member 25 is substantially triangular as described above, and a through hole 73 is provided at the center, and a shaft (pin) 28 is inserted through the through hole 73. Both ends of the shaft (pin) 28 are attached to the subframe 7 of the track via support members 74.
Accordingly, the rotation member 25 rotates about the shaft (pin) 28.
Further, two shafts (pins) 29 and 35 are inserted between the plate bodies 72 of the reverse rotation prevention mechanism 12.
The base end portion of the connecting link 26 is pivotally connected via a pin 29, and the tip ends of the two straps constituting the connecting link 26 are connected to the swing arm 15 via a pin 31. It is connected to the attachment part 75.
Further, as shown in FIG. 8, the hydraulic cylinder 27 is attached to the subframe 7 of the track 1 on the cylinder end side via a pin 32, and the tip end portion of the rod 30 is attached to the rotating member 25 via a pin 35. ing.

The positional relationship and operation of each member in the bumper device 40 of the present embodiment are as described in the above embodiment. By extending and contracting the hydraulic cylinder 27, the bumper 14 and the spare tire 101 are moved in parallel, so Move appropriately between hour positions.
Further, the posture of the bumper 14 when moving is always constant, and the hazard lamp unit 61 always faces backward.
The bumper device 40 of this embodiment has high rigidity and is practical.

  In the above-described embodiment, the spare tire 101 is fixed by the spare tire carrier 108 of the type wound with a chain. However, as shown in FIGS. 34 to 36, the spare tire 101 may be simply fixed by a bolt.

  FIG. 34 is a perspective view of a bumper device according to another embodiment of the present invention. FIG. 35 is an exploded perspective view in which the main part of the bumper device shown in FIG. 34 is extracted. FIG. 36 is an explanatory view showing the relationship between the bumper arm and the spare tire of the bumper device shown in FIG. 34, (a) is a perspective view thereof, and (b) is a side view thereof in the A direction. 37 and 38 are explanatory views showing a relationship between a bumper arm and a spare tire of a bumper device in still another embodiment, (a) is a perspective view thereof, and (b) is a direction A thereof. It is a side view. FIG. 39 is a perspective view of a bumper device according to still another embodiment of the present invention.

  In the bumper device 121 shown in FIG. 34, two crosspiece members 103 are provided on the lower surface of the bumper arm 16.

  Spare tires 101 are placed on the upper surfaces of the two cross members 103, and the spare tires 101 are fixed to the cross members 103 by bolts 106. In this embodiment, since the periphery of the spare tire 101 is surrounded by the frame body 105, the spare tire 101 is prevented from falling even if the bolt 106 may fall off during traveling.

  In the bumper device 121 shown in FIG. 34, the spare tire 101 is arranged in the frame 105 constituted by the two square pipes 65 and the bumper 14. However, as shown in FIG. Or a spare tire 101 may be attached to the upper surface of the frame 105 as shown in FIG.

  Further, in the above-described embodiment, the crosspiece 103 that holds the spare tire 101 is illustrated as connecting the left and right square pipes 65 of the bumper arm 16, but may be a cross-shaped crosspiece 110 as shown in FIG. . In the embodiment shown in FIG. 39, one end of the crosspiece 110 is fixed to a part of the swing arm 15 by a hinge 111.

  In the above-described embodiments, the bumper 14 is moved by the link mechanism, but a structure using a rack and pinion as shown in FIG. 40 or a cylinder as shown in FIG.

In the embodiment described above, the example in which the present invention is applied to the vehicle transport vehicle of the type in which the entire surface of the slide body (loading part) 6 lands on the ground has been described. The present invention can also be applied to a vehicle carrier of the type. That is, the present invention can also be applied to a vehicle transport vehicle having a structure in which the slide body (loading platform) 6 is stopped in an inclined posture and the vehicle is loaded and unloaded in this state. Furthermore, the present invention is not limited to a vehicle carrier, and can be widely applied to vehicles such as dump trucks. It is also possible to adopt a configuration in which the bumper 14 is moved up and down directly.
In the embodiment described above, the lifting device 100 includes a driving source that is independent from the driving source that moves the loading platform, but the driving source of the lifting device 100 and the driving source of the loading platform may be shared. That is, the lifting device 100 may move in conjunction with the lifting and lowering of the gantry.

It is a conceptual diagram which shows schematic structure and operation | movement of a vehicle carrier. It is a conceptual diagram which shows the operation | movement following the schematic structure of a vehicle carrier, and the state of FIG. It is a conceptual diagram which shows the operation | movement following the schematic structure of a vehicle carrier, and the state of FIG. It is a conceptual diagram which shows the operation | movement following the schematic structure of a vehicle carrier, and the state of FIG. It is a conceptual diagram which shows the schematic structure of a vehicle transport vehicle, and the operation | movement following the state of FIG. It is a conceptual diagram which shows the operation | movement following the schematic structure of a vehicle carrier, and the state of FIG. It is a conceptual diagram which shows the schematic structure of a vehicle transport vehicle, and the operation | movement following the state of FIG. It is a front view of the bumper device of a first embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper main body exists in a working position. It is a front view of the bumper device of a first embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper main body exists in a driving | running | working position. It is a skeleton figure of the bumper device of a first embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in a working position. It is a skeleton figure of the bumper device of a first embodiment employ | adopted with the transport vehicle of this invention, and shows the state in the middle of a bumper reaching from the working position to the traveling position. It is a skeleton figure of the bumper device of a first embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in the position at the time of driving | running | working. In the skeleton figure of the bumper device shown in FIG. 10, it is the skeleton figure which expanded the site | part of the rotation member, and shows the state when a bumper exists in the working position. In the skeleton figure of the bumper device shown in FIG. 11, it is a skeleton figure in which the part of the rotating member is enlarged, and shows a state in the middle of the bumper from the working position to the running position. In the skeleton figure of the bumper device shown in Drawing 12, it is a skeleton figure which expanded the part of a rotation member, and shows the state when a bumper exists in the position at the time of a run. It is a skeleton figure of the bumper device of a second embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in the working position. It is a skeleton figure of the bumper device of a second embodiment employ | adopted with the transport vehicle of this invention, and shows the state in the middle of a bumper from the working position to the traveling position. It is a skeleton figure of the bumper device of a second embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in the position at the time of driving | running | working. It is a skeleton figure of the bumper device of a second embodiment employ | adopted with the transport vehicle of this invention, and shows the behavior at the time of colliding with an obstruction. It is sectional drawing of the auxiliary | assistant connection member employ | adopted with the bumper apparatus of 2nd embodiment employ | adopted with the transport vehicle of this invention. It is a front view which shows the modification of the auxiliary | assistant connection member employ | adopted with the transport vehicle of this invention. It is a modification of the bumper apparatus of 2nd embodiment employ | adopted with the transport vehicle of this invention, and is a skeleton figure at the time of employ | adopting a wire as an auxiliary | assistant connection member, Comprising: The state when a bumper exists in the working position is shown. It is a modification of the bumper apparatus of 2nd embodiment employ | adopted with the transport vehicle of this invention, and is a skeleton figure at the time of employ | adopting a wire as an auxiliary | assistant connection member, Comprising: The behavior at the time of colliding with an obstruction is shown. It is a skeleton figure of the bumper apparatus of 3rd embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in the working position. It is a skeleton figure of the bumper device of a third embodiment employ | adopted with the transport vehicle of this invention, and shows the state in the middle of a bumper from the working position to the traveling position. It is a skeleton figure of the bumper apparatus of 3rd embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in the position at the time of driving | running | working. It is a perspective view of the engagement means employ | adopted by 3rd embodiment employ | adopted with the transport vehicle of this invention. It is explanatory drawing which shows operation | movement of the bumper apparatus of 3rd embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in the working position. It is explanatory drawing which shows operation | movement of the bumper apparatus of 3rd embodiment employ | adopted with the transport vehicle of this invention, and shows the state in the middle of a bumper from the working position to the traveling position. It is explanatory drawing which shows operation | movement of the bumper apparatus of 3rd embodiment employ | adopted with the transport vehicle of this invention, and shows a state when a bumper exists in a driving | running | working position. It is a perspective view of the bumper device of the example of the present invention. It is the disassembled perspective view which extracted and extracted the principal part of the bumper apparatus shown in FIG. FIG. 32 is a cross-sectional view of a spare tire carrier employed in the bumper device of FIG. 31. It is a perspective view of the bumper apparatus of the other Example of this invention. It is the disassembled perspective view which extracted and extracted the principal part of the bumper apparatus shown in FIG. It is explanatory drawing which showed the relationship between the bumper arm of the bumper apparatus shown in FIG. 34, and a spare tire, (a) is the perspective view, (b) is the A direction side view. It is explanatory drawing which showed the relationship between the bumper arm of the bumper apparatus and spare tire in the further another Example of this invention, (a) is the perspective view, (b) is the A direction side view. It is explanatory drawing which showed the relationship between the bumper arm of the bumper apparatus and spare tire in the further another Example of this invention, (a) is the perspective view, (b) is the A direction side view. It is a perspective view of the bumper device of further another example of the present invention. It is a perspective view which shows the modification of the bumper apparatus employ | adopted with the transport vehicle of this invention. It is a perspective view which shows the other modification of the bumper apparatus employ | adopted with the transport vehicle of this invention.

Explanation of symbols

1 truck (vehicle carrier)
2 Vehicle loading device 3 Lift frame 5 Tilt mechanism 6 Slide body (loading platform)
7 Subframe 10 Bumper device 11 Bumper drive unit 12 Reverse rotation prevention mechanism unit 13 Power unit 14 Bumper 15 Swing arm 16 Bumper arm 17 Auxiliary connecting member 18 Fixing member 19 Roller 25 Rotating member 26 Connecting link 40, 40 'Bumper device 43 Shock absorber 55 Bumper device 66 Main member 67, 68 Crosspiece 70 Hinge member 75 Continuous member mounting portion 100 Lifting device 101 Spare tire 105 Frame body 108 Spare tire carrier 121 Bumper device

Claims (9)

  In a transport vehicle including a vehicle body, a bumper attached to the vehicle body, and a loading platform that is movable relative to the vehicle body, the vehicle includes a lifting device that lifts and lowers a bumper, and a spare tire is attached to the lifting device. Carrying vehicle.   The transport vehicle according to claim 1, wherein the lifting device includes an arm that holds a bumper, and a spare tire is attached to the arm.   The transporting vehicle according to claim 1, wherein the lifting device includes two arms for holding a bumper, and a spare tire is attached between the arms.   The lifting device or the lifting device and the bumper each include a frame body, and the frame body is located near the bottom surface of the vehicle body when the bumper is in the raised position, and a spare tire is attached to the frame body. The transport vehicle according to any one of 1 to 3.   4. The transport according to claim 1, wherein the elevating device has a link mechanism, and the elements constituting the link mechanism have a three-dimensional frame, and a spare tire is attached to the frame. vehicle.   The lifting device includes a drive source and a transmission mechanism that moves the bumper by transmitting the movement of the drive source to the bumper, and at least one of the elements constituting the transmission mechanism has two types of movement with respect to the force received from the bumper side. 6. The transport vehicle according to claim 1, wherein there is a speculative point that can occur, and the element moves beyond the speculative point when the bumper is moved from the working position to the traveling position. .   The transporting vehicle according to any one of claims 1 to 6, wherein the elevating device has a drive source independent of a drive source that moves the loading platform.   The transport vehicle according to claim 7, wherein the element having a thought point is a rotating member that rotates about a rotation axis.   The lifting device has a chain mechanism composed of a swing arm, a bumper arm that holds the rear bumper, an auxiliary connecting member, and a fixing member, and moves the rear bumper from the working position to the traveling position. Is moved from the position in which the swing arm is suspended toward the horizontal position, the auxiliary connecting member moves in parallel with the movement of the swing arm, and the bumper arm is lifted while maintaining a substantially horizontal position. The transport vehicle according to any one of claims 1 to 8, wherein:

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