JPS58112882A - Rear dump door opening/closing device for truck - Google Patents

Abstract

PURPOSE:To prevent the trouble of the open/close function of a rear dump door, by mounting a shielding member around the pivot shaft of the rear dump door with predetermined interval against the rear end of a load box. CONSTITUTION:A shielding member A has predetermined gap (L) against the rear end of a load box 3, and it is a pipe formed with a flexible material to be secured to the load box 3 approximatey coaxially with a pivot shaft 7 where the space between the load box 3 and the rear dump door 5 is shielded by said pipe 26. Since such as a sand will drop smoothly, the load such as a soil will never be stored between the dump door 5 and the rear end of the load box 3 and the soil partially accumulated on the pipe 26 and at the lower end of the dump door 5 is scratched by the lower end when the dump door 5 is closed while standing then dropped through the gap (L).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear sliding door opening/closing device for a freight vehicle, and in particular, when a lower hinged, top-opening type rear sliding door is opened to a hanging position, it is possible to prevent the accumulation of dirt, etc. at the lower end of the rear sliding door. This is to ensure that the load on the rear door does not interfere with the operation of the rear sliding door.

The present invention will be explained below using examples. FIG. 1 shows a side view of an embodiment of a rear sliding door opening/closing device according to the present invention.

In this embodiment, the freight vehicle is configured as a dump truck, and a cargo box 3 is mounted on the frame of the dump truck via a subframe 1 so as to be tilted rearward along with a main girder 2 about a horizontal dump shaft 4. has been done. Rear door of cargo box 5
is pivotally supported around a horizontal pivot 7 provided at the rear of the cargo box 6 by a bracket 6 fixed thereto and a bracket 6' fixed to the cargo box 3 so as to be pivotable rearward from the rear end surface of the cargo box.

A bell crank 8 is rotatably supported around a pivot 9 near the front side of the main girder 2, and a roller 8B at the tip of the eight rear arms is arranged so as to hit a stopper 10 below.
The upper end of the upward arm 8C is attached to the tip of the operating lever 11.
It is pivoted by 2.

The operating lever 11 has a spring buffer cylinder 16 in the middle, and is pulled rearward by a return spring 14 suspended from the bottom of the cargo box.

The rear end of the actuating lever 11 is pivotally connected to one end of a relay bell crank 16 whose center is pivotally supported to the main girder 2 by a pin 15 via a pin 17, and the other end of the relay bell crank 16 is connected to the front end of a connecting link 18 by a pin 19. It is pivoted by. The other end of the connecting link 18 is pivotally connected to the front end of the floating link 20A of the four-bar link 20 provided on the main girder 2 by a pin 21, and the rear end of the floating link 20A is pivotally connected to one end of the connecting link 22 by a pin 26. The other end of the connecting link 22 is connected to another plaque (24) and the bottle 25 (fixed to the rear Hatomi Imado 5).
It is pivoted by.

According to the above-described configuration of the opening/closing link mechanism and the operating section connected thereto, when the cargo box 6 starts to tilt backward around the dump truck 4, at the beginning, the roller 8 balances the traction force of the return spring 14. The contact state with Suji and Pa10 is maintained, and the rear fan door is kept closed. When the tilt angle of the cargo box exceeds a certain angle, the roller 8B separates from the stopper 10, and the operating lever 11 is pulled by the return spring 14 and moves to the right in FIG. The link 20A moves to the left, the rear sliding door 5 is opened, and the rear sliding door 5 moves to a state where it hangs down beyond the angle at which it lines up with the bottom surface of the cargo box. When returning from the tilted state, the rear sliding door is closed by performing the operation opposite to the above.

By the way, when the rear sliding door 5 moves to a hanging state in conjunction with the tilting of the loading box 3, loaded materials such as earth and sand get caught between the rear end of the rear field door 5 and the rear end of the loading box 6, making it difficult to open and close the rear sliding door. Operation may be impaired. The introduction of a shielding portion to prevent this will be explained below with reference to FIGS. 2 to 4.

A first embodiment of the shielding member A is shown in FIG.

This shielding member A is made of a flexible material (
It consists of a pipe made of (for example, rubber).

Note that this shielding member A is connected to a connecting link 22 between the left and right ends of the cargo box 6. Plaquet) 6.6' part is arranged.

Therefore, as the cargo box 6 tilts, the load such as earth and sand falls from the rear end of the cargo box 6 through the rear sliding door 5 and onto the ground.
At this time, the space between the cargo box 6 and the rear sliding door 5 is covered by the pipe 26, and the earth and sand slide down on this pipe 26, so that the loaded material such as earth and sand is transferred between the rear sliding door 5 and the rear end of the loading box 3. It never stays in. Incidentally, some of the earth and sand accumulated on the pipe 26 and at the lower end of the rear fan door 5 is scraped off by the lower end when the rear fan door 5 is raised and closed, and falls from the gap 11f.

Next, a second embodiment of the shielding member A will be described based on FIG. 6. In this embodiment, the shielding member A is an integral part of the arcuate cover 2.
7, and is further fixed to the rear end of the cargo box 3 around the pivot 7, and a round bar 28 is fixed to the lower end thereof. A certain gap l is formed between the front end of the arc-shaped integral cover 27 and the rear end of the cargo box 3.

In this embodiment, earth and sand falling from the cargo box 6 when the cargo box is tilted slides down along the arc-shaped integral cover 27 and the rear sliding door 5. Note that some of the earth and sand is only deposited on the lower end of the rear fan door 5 and the arc-shaped cover 26, but this earth and sand is scraped off by the round bar 28 and the rear fan door 5, and is deposited either directly on the ground or through a gap. fall to the ground.

In addition, in the third embodiment (Fig. 4) of the shielding member A, #1 is formed on the arc-shaped cover 29 that is attached to the pivot shaft 7, and its lower end is stretched between the end of the cargo box 3. Due to the biasing force of the spring 30, its upper end is always loaded! 13 is formed so as to be in contact with the back surface of the rear end. A constant gap 1 is formed between the front end of the arc-shaped integral cover 29 and the rear end of the cargo box 6.

Therefore, when the cargo box 3 is tilted, the arcuate cover 29 is always in contact with the cargo box 6 and covers the area around the pivot shaft 7, so that dirt, etc. is reliably on the ground via the arcuate cover 29 and the rear fan door 5. Fall. Some of the earth and sand remains on the arc-shaped cover unit 29, but when the rear fan door 5 is raised and closed, the rear fan door 5 overcomes the force of the spring 30 and rotates the arc-shaped cover unit 29 counterclockwise. To do this, the front end of the arcuate cover is tilted forward and falls from the stop 11111.

As described above, in the present invention, since the shielding member is installed around the axis of the rear sliding door with a constant gap between the rear end of the cargo box and the rear end of the four boxes, the shielding member is installed between the rear sliding door and the rear end of the four boxes. In addition, part of the load such as earth and sand accumulated on the shielding member can be removed from the rear door through the gap formed between the shielding member and the cargo box. When the rear sliding door stands up and closes, it is scraped by the rear sliding door and falls, so there is no problem with the opening and closing operation of the rear sliding door.

[Brief explanation of drawings]

Fig. 1 is a side view of one embodiment of the rear sliding door opening/closing device according to the present invention, Fig. 2 is an enlarged view showing the first embodiment of the shielding member, and Fig. 6 is an enlarged view showing the second embodiment of the shielding member. 4 is an enlarged view showing the sixth embodiment of the shielding member, and FIG. 5 is an enlarged view showing the sixth embodiment of the shielding member.
FIG. 1 is a sectional view taken along line 1. 3... Loading box, 4... Dump shaft, 5... Rear fan door, 7... Pivot, A... Shielding member. Procedural Amendment April 91, 1980 Commissioner of the Patent Office 1. Indication of the case 1982 Patent Application No. 214845 2. Name of the invention Rear sliding door opening/closing device for a truck 3. Person making the amendment Relationship to the case Patent Applicant: 1-5-25 Kozone-cho, Nishinomiya City (235) ShinMaywa Industries Co., Ltd. Representative: Hiruji Tamagawa 4, Attorney's Specification and Country I 6, Contents of Amendments As shown in the attached sheet. Contents of the amendment (1) The last line of page 4 of the specification, "Figure 4", is amended to "Figure 6". (2) "26" on page 6, line 9 of the specification is corrected to "27". (6) On page 7 of the specification, line 8, add the following sentence after ``Falling from the gap @1''. As in the second and sixth embodiments, the shielding member is constructed of an integral arc-shaped cover 61, and furthermore, a cargo box 6 is provided at the 7th position of the pivot axis.
It is fixed to the rear end, and a certain gap l is formed between the front end of the arcuate cover 61 and the rear end of the cargo box 3. The distance between the lower edge of the rear end piece 5 (the locus shown by the two-dot chain line in FIG. 6) and the outer skin of the arcuate cover 31 is smaller than the distance Ill at the front end of the arcuate cover 61, and is equal at the rear thereof. The distance is set to gradually increase so that the rear lower end edge of the arcuate cover 61 is located above the center of the pivot shaft 7. In this embodiment, the dirt that falls from the cargo box 6 when the cargo box is tilted is deposited on the lower end of the rear end piece 5 and the arcuate cover unit 61, but this dirt is scraped off by the rear door 5.
Alternatively, along the arcuate cover 61 or between 11
11 and fall to the ground. (4) Specification page 8, No. 6
Immediately after the line ``Cross-sectional view'', add ``[Figure 6 is an enlarged view showing the fourth embodiment of the shielding member'']. (5) 1 attachment (￥l rhyme qJ illustrative record? addition? L.

Claims (1)

[Scope of Claims] (1) In a freight vehicle in which a rear sliding door is pivotally supported at the lower rear end of a cargo box so as to be able to be freely opened and closed, a shielding member is installed on the pivot support surface of the rear working door, and the shielding member is A rear sliding door opening/closing device for a freight vehicle, characterized in that the line has a constant width from the rear end of a cargo box. (2) The rear sliding door IIIM device for a freight vehicle according to claim 1, wherein the shielding member is formed in a flexible vibrator installed on the pivot face of the rear sliding door. (6) The opening/closing device for a truck according to claim 1, wherein the shielding member is integrally formed with a circular cover installed on the pivot face of the rear sardine door. (4) The shielding member is formed integrally with an arc-shaped cover that is installed in a floating manner on the pivot face of the rear wet door and is pulled so as to be in constant contact with the load ****am. The rear door opening/closing device for a freight vehicle as described in paragraph 1. (5) The rear sliding door opening/closing device for a freight vehicle according to claim 1, wherein the rear sliding door is connected to an opening/closing link mechanism having an operating section.