JPH0526669U - Rear bumper device such as dump truck - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a rear bumper device in which the rear bumper does not interfere with the rear bumper by lowering the traveling position of the rear bumper to the rear end side even when the cargo platform is tilted. . [Structure] The chassis frame and the rear bumper are connected by first link means 11 and 12 so that the rear bumper 6 moves in parallel in the longitudinal direction along the chassis frame 3,
At the end of the first link means on the chassis frame side, a second
One end of the link means 15 is connected, and the second link means has the rear bumper within the predetermined ground height range and the predetermined inside range in the normal position where the loading platform is not tilted, but the loading platform is tilted. Then, it acts on the first link means in relation to the bed operation so as to move the rear bumper inward along the chassis frame beyond the limit range.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rear bumper device for a freight vehicle having a tilting luggage carrier such as a dump truck.

[0002]

[Prior Art]

 The rear bumper of large-sized trucks is restricted by the safety standards of the Road Transport Vehicles Act, and the height from the ground is also limited, and the length range from the rear end of the cargo bed to the inside, that is, the driver's side is also limited. From the perspective of safety, this safety standard has been reviewed and is being limited to a narrower range. In response to such regulations, it is possible to arrange the rear bumper at a low position and on the rear end side in a freight vehicle having a fixed cargo bed like an ordinary freight vehicle, and it is easy to comply with such regulations.

[0003]

[Problems to be solved by the device]

 However, in a freight vehicle such as a dump truck where the loading platform tilts, the rear end of the loading platform inclines toward the ground side, so if the rear bumper extends to the rear end side of the loading platform, the rear end side of the loading platform hits the rear bumper. Doing so may damage the rear bumper or damage the rear end of the loading platform.

Therefore, an object of the present invention is to lower the running position of the rear bumper and to the rear end side even when the loading platform is tilted, such as in a dump truck, and to load the loading platform when the loading platform is tilted. Is to provide a rear bumper device that does not interfere with the rear bumper.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, according to the present invention, there is provided a rear bumper device for a freight vehicle having a tilt luggage carrier, wherein the rear bumper and the rear bumper are arranged so as to move in parallel in the longitudinal direction along the chassis frame. And the first link means are connected to each other, and one end of the second link means is connected to the end portion of the first link means on the chassis frame side. However, the rear bumper is located within the predetermined above-ground height range and within the above-mentioned predetermined inside range, but when the platform is tilted, the rear bumper is moved inward along the chassis frame beyond the limit range. Provided is a rear bumper device for a lorry such as a dump truck, which is characterized in that it acts on the first link means in relation to the operation of the platform.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 discloses a dump truck 1 equipped with a rear bumper device according to a first embodiment of the present invention. The loading platform 2 of the truck 1 is supported by a subframe 4 mounted on a chassis frame 3 extending in the longitudinal direction of the truck, and is pivoted about a tilt hinge point 5 by a well-known dump mechanism (not shown). Tilt. On the rear side of the platform of the chassis frame 3, the rear bumper 6 connected to the chassis frame 3 is located at the ground level (H) within the limit range and at the inner position (D) within the limited range from the rear end of the platform. Have. The length of the rear bumper 6 itself is also regulated to a certain length or more. By the way, according to the current safety standards, the height H is regulated within 700 mm, the inner length D is regulated within 600 mm, and the rear bumper length is regulated over 1500 mm. And, according to the safety standards enforced from April, 1992, the height H is strictly regulated within 550 mm, the inner length D is within 400 mm, and the rear bumper length is over 2100 mm. ..

In general, in a freight vehicle or the like, it is desirable that the ground height of the rear bumper is as high as possible and the inner length of the rear bumper is as long as possible in consideration of traveling. However, from the perspective of safety, the regulations are becoming strict as mentioned above. Under such regulations, in a freight vehicle such as the dump truck 1 in which the luggage carrier is tilted, the rear bumper 6 interferes with the rear edge of the luggage carrier, which is not desirable. Therefore, in the present invention, as shown in FIGS. 2 and 3, the rear bumper 6 tilts the loading platform 2 and moves the rear bumper along the chassis frame 3 inwardly beyond the limit range along the chassis frame. A moving device is provided.

Referring to FIG. 2, a rear bumper device 10 according to the present invention includes a rear bumper 6 and an extension arm 7 of the rear bumper 6 so that the rear bumper 6 moves in parallel in the longitudinal direction along the chassis frame 3. They are connected by link arms 11 and 12 which constitute the first link means. That is, the link arm 11 and the link arm 12 form a horizontal link, and the ends of each arm are pivotally supported by the extension arm 7 of the rear bumper and the mounting bracket 8 of the chassis frame 3, respectively, so that the rear bumper 6 has the chassis frame. 3 can be translated in the longitudinal direction.

In the first embodiment, one of the link arms constituting the first link means is formed into a bent arm. One end, that is, the lower end of the bending arm 12 is pivotally supported by the extension arm 7 of the rear bumper, the bending intermediate portion 13 is pivotally supported by the mounting bracket 8 of the chassis frame, and the other end extends upward. One end of a rod 15 constituting the second link means is connected to the end portion of the bending arm 12 of the first link means on the chassis frame side. The other end of the second link rod 15 is pivotally supported by a bracket 16 on the rear end side of the tilt hinge point 5 of the platform 2.

With such a configuration, as shown in FIG. 2, the rear bumper 6 is in the position of the predetermined ground height H and in the position of the predetermined inner range D in the normal position where the loading platform 2 is not tilted. .. However, as shown in FIG. 3, when the loading platform 2 tilts around the hinge point 5, the rod 15 constituting the second link means pushes the end portion of the bending arm 12 of the first link means to move the first link means. The arms 11 and 12 of the one-link means are moved in parallel, whereby the rear bumper 6 is moved inward along the chassis frame 3 beyond the inner limit range D. Therefore, the rear bumper 6 is pulled inward in conjunction with the tilting of the luggage carrier 2 and the rear end of the luggage carrier does not interfere with the rear bumper. The arms 11 and 12 forming the first linking means, the rod 15 forming the second linking means, and the like are arranged on the left and right sides of the freight vehicle so that the rear bumper 6 is moved in parallel with the chassis frame in the longitudinal direction. Are provided in pairs on the side of.

FIGS. 4 and 5 show a second embodiment of the rear bumper device according to the present invention. 4, in the rear bumper device 20 according to the present invention, the chassis frame 3 and the extension arm 7 of the rear bumper 6 have a first link so that the rear bumper 6 moves in parallel in the longitudinal direction along the chassis frame 3. They are connected by link arms 21 and 22 which constitute the means. That is, the link arm 21 and the link arm 22 form a parallel link, and the ends of each arm are pivotally supported by the extension arm 7 of the rear bumper and the mounting bracket 9 of the chassis frame 3, respectively, and the rear bumper 6 is connected to the chassis frame. 3 can be translated in the longitudinal direction.

In the second embodiment, one end of one of the link arms constituting the first link means is extended. One end, that is, the lower end of this extension arm 21 is pivotally supported by the extension arm 7 of the rear bumper 6, the intermediate portion 23 is pivotally supported by the mounting bracket 9 of the chassis frame 3, and the other end extends upward. One end of a rod 25 forming a part of the second link means is connected to the upper end of the extension arm 21. The second link rod 25 extends to the front side along the chassis frame 3, and its front end portion is pivotally connected to one end of a bending arm 26 which is another member constituting the second link means. It is supported. The bending arm 26 has its middle bending portion 27 pivotally supported by the subframe 4 fixed to the chassis frame 3. A roller 29 is provided at the other end of the bending arm 26. The roller 29 extends forward of the hinge point 5 of the loading platform 2 and below the loading platform in a horizontal posture in which the loading platform 2 is not tilted. The contact member 31 is in contact. As a result of this contact, as shown in FIG. 4, the rod 25 moves to the front side and the arms 21 and 22 of the first link step are formed with a predetermined inclination, so that the rear bumper 6 is moved to a predetermined ground height H. Within a predetermined range and within a predetermined inner range D position.

In the second embodiment, the rod 25, which is a component of the second link means, is provided with a return spring 33 between the rod 25 and the chassis frame. Therefore, the rod 25 is pulled rearward along the chassis frame 3, and in the normal state of FIG. 4, the contact of the contact member 31 with the roller 29 causes the bending arm 26 to be subjected to the force of the spring 33. Against this, the rod 25 is moved forward (on the left side in the drawing). However, as shown in FIG. 5, when the loading platform 2 tilts around the hinge point 5, the abutment member 31 moves away from the roller 29 and the force of the return spring 33 pulling the rod 25 causes the rod 25 to move to the rear side (in the figure). Not only to move the bending arm 26 counterclockwise but also to push the end of the bending arm 21 of the first link means to move the bending arm 26 to the arm 21 of the first link means. 22 is translated. Therefore, since the rear bumper 6 is moved inward along the chassis frame 3 beyond the inner limit range D, the rear bumper 6 is pulled inward in conjunction with the tilting of the luggage carrier 2, and the rear end of the luggage carrier is moved to the rear bumper. It will not interfere. The first link means, the second link means, etc. are provided in pairs on the left and right side surfaces of the freight vehicle, as in the first embodiment.

[0014]

[Effect of the device]

 According to the present invention, the rear bumper is connected by the first link means so as to be translated in the longitudinal direction along the chassis frame, and one end of the second link means is connected to the end portion of the first link means. In the normal position where the platform is not tilted, the rear bumper is within the predetermined ground height range and within the predetermined inside range, but when the platform is tilted, the rear bumper is restricted to the limited range along the chassis frame. Since it is moved inwardly over the vehicle, even in the case of a truck such as a dump truck whose tilting platform is tilted, the position of the rear bumper can be set to a low position at the time of running and at the rear end side, and it can be used during normal running. Ensures that the position of the rear bumper can fully comply with the safety standards that will become more severe in the future, and that the luggage carrier does not interfere with the rear bumper when the luggage carrier is tilted. Accident such as breakage of Yabanpa can be nil.

[Brief description of drawings]

FIG. 1 is a side view of a truck having a tilt platform such as a dump truck according to the present invention.

FIG. 2 is a side view of the rear bumper device according to the first embodiment of the present invention in a normal state.

FIG. 3 is a side view of the rear bumper device of FIG. 2 in a tilted state of the loading platform.

FIG. 4 is a side view of a rear bumper device according to a second embodiment of the present invention in a normal state.

5 is a side view of the rear bumper device in FIG. 4 in a tilted state of the loading platform.

[Explanation of symbols]

 1 dump truck 2 loading platform 3 chassis frame 4 subframe 5 tilt hinge point 6 rear bumper 7 rear bumper extension arm 8 bracket 9 bracket 10 rear bumper device 11 first link means link arm 12 first link means link arm (flexing arm) 15 Rod as Second Link Means 20 Rear Bumper Device as Second Embodiment 21 Link Arm of First Link Means 22 Link Arm of First Link Means 25 Rod of Second Link Means 26 Bending Arm of Second Link Means 29 Roller 31 Contact member 33 Return spring

Claims (3)

[Scope of utility model registration request] 1. A rear bumper connected to the chassis frame is provided at a rear portion of the chassis frame at a height above ground within a limit range and at an inner position within a limit range from a rear end of the cargo frame, wherein the cargo frame is tilted. In a rear bumper device for a freight vehicle such as a dump truck, the chassis frame and the rear bumper are connected by a first link means so that the rear bumper moves in parallel in the longitudinal direction along the chassis frame. One end of the second link means is connected to the end portion of the link means on the chassis frame side, and in the second link means, the rear bumper is within the predetermined ground height range in a normal position where the loading platform is not tilted. Although the position is within the predetermined inner range, the rear bumper is moved inward along the chassis frame beyond the limited range when the platform is tilted. Rear bumper device of lorries such as a dump truck, characterized in that acting on the first link means with respect to the loading platform operation. 2. The rear bumper device according to claim 1, wherein the first link means includes a bending arm pivotally supported at one end by the rear bumper and at the other end by the second link means. The middle portion is pivotally supported by the chassis frame, the other end of the second link means is pivotally supported by the load platform, and when the load platform is tilted, the second link means causes the second end of the bending arm of the first link means to move. The rear bumper device characterized in that the rear bumper is moved inward along the chassis frame by pushing it. 3. The rear bumper device according to claim 1, wherein the second link means is pivotally supported at an end of the first link means, and one end is pivotally supported at an opposite end of the rod. An intermediate portion is composed of a bending arm pivotally supported with respect to the chassis frame, and when the loading platform tilts, the loading platform pushes the other end of the bending arm to pivot the arm, and the pivot pushes the rod. The rear bumper device is characterized in that the end portion of the first link means is pushed in, whereby the rear bumper is moved inward along the chassis frame.