JP2567614Y2 - Rear bumper structure of tiltable trailer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rear bumper of a trailer. More specifically, for example, a connecting device is provided on a tractor so as to be able to move up and down, a front portion of a semi-trailer is connected to this connecting device, and the connecting device is raised to tilt the semi-trailer backward. And the structure of a rear bumper of a so-called tiltable trailer.

[0002]

2. Description of the Related Art Conventionally, a semi-trailer connected to a tractor is provided so as to be tiltable, and a load in the semi-trailer can be discharged from a rear section opening.
Rahl's tilting device is known. The trailer equipped with such a tilting device has the rear bumper mounted at a high position from the ground surface, so that the rear bumper does not contact the ground surface even when the semi-trailer is tilted. However, from the viewpoint of safety, the security standards of vehicles were revised, and it was required to lower the height of the rear bumper from the ground surface. Therefore, when the semi-trailer tilts, the lower end of the rear bumper comes into contact with the ground surface.

In order to avoid this, a conventional rear bumper is used.
As shown in FIG. 8 (b), the rear bumper j is pivoted clockwise at an appropriate angle about the pivot pin m so that it floats, and its position can be held by position holding means such as a chain n. I was For this reason, in the conventional rear bumper, the rear bumper is manually operated every time the semi-trailer B is tilted.
The position of j had to be changed, which was a laborious task, as well as labor.

[0004]

When the switch of the solenoid circuit incorporated in the parking brake device of the trailer is operated, the rear bumper can rotate in conjunction with the switch operation, and the trailer is tilted. When you do, the trailer rear bumper
Is rotated in conjunction with the inclination of the trailer so that the turning operation of the rear bumper can be performed safely and easily.

[0005]

SUMMARY OF THE INVENTION A tiltable tray having a rear bumper rotatable clockwise around a pivot pin provided at the rear end of a main frame of the trailer and capable of maintaining a vertical position. The vehicle has a position holding device capable of turning the rear bumper into a rotatable state or a fixed state in conjunction with a switch operation of a solenoid circuit incorporated in the parking brake device of the trailer; -When the vehicle is tilted, the locked state of the position holding device is released simultaneously with the actuation of the parking brake, and the rear bumper is rotated in conjunction with the inclination of the trailer. The pivoting pin 4 provided at the rear end of the main frame of the trailer is rotatable clockwise around a vertical line and can maintain a vertical position, and has a wheel 8 at a lower free end side. Lock pin insertion holes 6a and 6b are formed in both the main frame 1 side and the rear bumper 7 side and are spaced from the support pin 4, and hold the vertical position when the bumper 7 is in the vertical position. The lock pins of the device are inserted into the lock pin insertion holes 6a and 6b, and the lock pin 5 of the vertical position holding device escapes from the lock pin insertion holes 6a and 6b when the trailer tilts backward. The position holding device was configured as follows. Further, the free end of the rear bumper 7 and the main frame 1 are connected by two folded links 12a and 12b, and a link bending cylinder 13 is connected to the tip of the two folded links. By the operation of 13, the two-folded link is bent to rotate the rear bumper forward.

[0006]

FIG. 8 shows a trailer according to the present invention. In FIG. 8, A is a tractor, and a support b is erected on a vehicle body frame a. One end of a link c is pivotally supported at the tip of the support b by a pin d, and one end of an L-shaped link e is pivotally supported by a pin f at the other end of the link c. Further, a coupler g is attached to the other end of the L-shaped link e. A hydraulic cylinder h is connected between an intermediate portion of the link c and the vehicle body frame a or the support b.
The link c can be raised and lowered around the pin d by the expansion and contraction of h. A hydraulic cylinder i is connected between the link c and the L-shaped link e. The expansion and contraction of the hydraulic cylinder i causes the L-shaped link e to rotate around the pin f, thereby causing the trailer B to rotate. Can be pushed upward to incline. j is a rear bumper. As described in the section of the prior art, conventionally, the lock pin k is removed as shown in FIG. 8 (b), and the worker manually turns the pivot pin m around the pivot pin m. −n.

Next, the rear bumper of the present invention will be described with reference to FIGS. 1 is the main frame of the trailer,
A flange portion 1a is partly cut off at the rear end of the main frame 1, and a reinforcing block 2 is fixedly provided below the web 1b. Brackets 3 and 3 are pivotally supported by pivot pins 4 with the reinforcing block 2 interposed therebetween. The bracket 3 has an insertion hole 6a for a lock pin 5 for holding the bracket 3 in a vertical position alongside the pivot pin 4. Further, a pin insertion hole 6b is also formed in the reinforcing block 2 side. When the lock pin 5 is pushed out and inserted into the insertion holes 6a and 6b by the cylinder 11, the rear bumper 7 cannot rotate around the pivot pin 4. Conversely, when the lock pin 5 is pulled out, it becomes possible to rotate around the pivot pin 4.

When the semi-trailer B is tilted after the lock pin 5 is removed from the insertion holes 6a and 6b, the wheel 8 (FIG. 2B) of the rear bumper 7 contacts the ground at a certain angle. When the rear bumper 7 is further tilted, the rear bumper 7 rotates clockwise about the pivot pin 4 as a fulcrum, that is, toward the front of the semi-trailer, and the semi-trailer B tilts to a predetermined angle without any resistance. It becomes possible to discharge the load. In order to return the tilted state to the original state, when the tilting of the semi-trailer B is released, the rear bumper 7 rotates counterclockwise about the pivot pin 4 by its own weight. Finally, the center of gravity G of the bumper 7 is located to the left of the vertical line passing through the center of the pivot pin 4 (FIG. 3).
(b)) and a stopper fixed to the rear of the rear bumper 7
9 is configured to abut the reinforcing block 2. Just at this position, the core of the pin insertion hole 6a of the bracket 3 and the core of the pin insertion hole 6b of the reinforcing block 2 do not match, and the lock pin 5 can be inserted without difficulty.

When the braking of the semi-trailer B is released, the lock pin 5 is pushed by the cylinder 11 and inserted into the insertion holes 6a and 6b, so that the semi-trailer B can run ( FIG. 4 (a)). On the contrary, the lock pin 5 is inserted into the insertion holes 6a and 6b.
(Fig. 4 (b)), the trailer B
The brake force is acting on the brake system 10 of the above, and the semi-trailer B cannot run. In this way, the brake of the semi-trailer B and the operating cylinder 13 of the lock pin 5 are linked to each other, and the hydraulic cylinder h
When (FIG. 8) is operated, the braking circuit of the semi-trailer B operates, and at the same time, the lock pin 5 also operates.

FIGS. 5 and 6 show another embodiment of the present invention.
FIG. 6 is a side view of FIG. 5. The upper end of the vertical member 7a of the rear bumper 7 is pivotally supported by the main frame 1 so as to be able to rotate clockwise, and the other end is connected to one end of a link 12 by a pin. The link 12 has a link 12a and a link 1 that are pin-connected at the center.
The other end of the link 12b is connected to the rod of the cylinder-13. The pivot pin 14 at the intermediate position of the link 12b is attached to an appropriate bracket fixed to the main frame 1, and is expanded and contracted by the cylinder 13 as shown in FIG.
As shown by a two-dot chain line in FIG. 7A, the link 12 is broken, and the vertical member 7a of the rear bumper 7 is rotated clockwise.

FIG. 7 shows that the link 12 'of FIG. 5 is bent rightward (rearward) opposite to that of FIG. 5 so that the rear bumper 7 can be rotated clockwise. Is the same as FIG.

Holding the rear bumper 7 vertically, or
Cylinders 11 and 1 used to enable rotation
The operation of No. 3 is the parking brake equipped on the trailer itself.
It is linked to the key operation. That is, the tractor
When the trailer B is tilted while the trailer A is connected to the trailer B, first, a switch 14 of a solenoid valve provided in the middle of the parking brake on the trailer B side is turned on (FIG. 4). Then, the switching valve 15 switches, the lock pin 5 provided at the tip of the rod of the cylinder 11 comes out of the pin insertion holes 6a and 6b, and the rear bumper 7 becomes rotatable. Thereafter, the semi-trailer B is tilted by operating the lifting cylinder. In the case of the second embodiment in FIGS. 5 and 6, and the third embodiment in FIG.

[0013]

When the switch 14 of the solenoid circuit incorporated in the parking brake device of the trailer B is operated, the rear bumper 7 can be turned or held in the vertical position. When tilting the trailer B, the trailer B
Since the rear bumper 7 automatically turns, the turning operation of the rear bumper 7 becomes easy, and the safety of the rear bumper 7 can be achieved.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a rear bumper according to the present invention;
(a) is a front view, (b) is an enlarged view of a mounting portion of a reinforcing block.

2A and 2B show an operation state of a rear bumper, wherein FIG. 2A shows a running state and FIG. 2B shows a leaning state.

3A and 3B are detailed views of a pivot portion of a rear bumper, wherein FIG. 3A is a perspective view and FIG. 3B is a diagram showing a positional relationship between a pivot pin, a lock pin, and a center of gravity.

4A and 4B are operating system diagrams of the lock pin, wherein FIG. 4A shows a state where the lock pin is fitted into the insertion hole, and FIG. 4B shows a state where the lock pin is removed from the insertion hole.

FIG. 5 is a front view of a second embodiment of the present invention.

FIG. 6 is a right side view of FIG.

FIG. 7 shows still another embodiment of the present invention.

FIGS. 8A and 8B show a known trailer that can be tilted, FIG. 8A is a front view, and FIG. 8B is a rear bumper holding structure.

[Explanation of symbols]

 A Tractor B Trailer 1 Main frame 1a Flange 1b Web 2 Reinforcement block 3 Bracket 4 Pin 5 Lock pin 6,6a, 6b Insertion hole 7 Rear bumper 7a Vertical member 7b Horizontal member 8 Wheel 9 Stopper 10 Blur −Kish− 11 Cylinder− 12,12a, 12b Link 13 Cylinder− 14 Switch 15 Switching valve

Claims (3)

(57) [Scope of request for utility model registration] 1. A tiltable trailer having a rear bumper rotatable clockwise around a pivot pin provided at a rear end of a main frame of the trailer and capable of maintaining a vertical position. The rear bumper interlocks with the switch operation of the solenoid circuit incorporated in the parking brake device of the trailer.
The parking brake of the trailer is actuated to release the locked state of the position holding device at the same time as the parking brake of the trailer is actuated. The structure of the rear bumper of the tiltable trailer, characterized in that it rotates in conjunction with the tilt. 2. A wheel (8) is rotatable clockwise around a pivot pin (4) provided at the rear end of the main frame of the trailer and can be held in a vertical position. Lock pin insertion holes (6a, 6b) are provided on both the main frame (1) side and the rear bumper (7) side and are spaced from the pivot pin (4).
When the bumper (7) is in the vertical position, the lock pin (5) is inserted into the lock pin insertion hole (6a).
And 6b), wherein the lock pin (5) comes out of the lock pin insertion holes (6a and 6b) when the trailer is tilted backward. Item 4. The structure of the rear bumper of the tiltable trailer according to Item 1. 3. A two-fold link (12a, 12b) between the lower free end of the rear bumper (7) and the main frame (1).
3. The structure of a tiltable trailer rear bumper according to claim 2, wherein a link bending cylinder (13) is connected to the tip of said two-folded link.