JPH0567520U - Door opening and closing device for lorries - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a door opening / closing device for a freight vehicle having a narrow turning range, which can accommodate a door that has been opened and closed in the upper part of a packing box in a compact manner. [Structure] The upper end of a first rotating arm 6 is connected to the center of the door 4 so as to be rotatable and movable in the height direction of the door 4. The lower end of the second rotating arm 8 is pivotally attached to the lower portion of the door 4. The pivot arms 6 and 8 are pivotally attached to the luggage box 2, and the door 4 is rotatably provided above the luggage box 2. Further, a rotation transmission mechanism 14 for rotating the first and second rotation arms 6 and 8 in synchronization with each other at a constant angular velocity ratio is provided. [Effect] Both rotating arms 6 and 8 rotate at a constant angular velocity ratio, and when the door 4 is opened, the connection point between the second rotating arm 8 and the door 4 moves relatively below the door 4. And the door 4 is the packing box 2
The door 4 can be smoothly turned along the corner of A, and the door 4 can be opened and closed within a small turning range.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a door opening / closing device for a truck, and more particularly to a door opening / closing device for a truck that stores an opened / closed door in an upper part of a luggage box.

[0002]

[Prior Art]

 Conventionally, this type of luggage box side portion, that is, a side or rear door of the luggage box is stored in the upper portion of the luggage box, for example, as shown in FIG. 10 in Japanese Utility Model Laid-Open No. 58-61622. The upper end of the door A is rotatably provided on the luggage box B by a roof member C that constitutes a part of the roof of the luggage box B, and the lower center part of the door A is pivotally attached to the luggage box B by a pin D. The load box B is rotatably provided through the linked link mechanism E, and the link mechanism E and the vertical rod F are connected to each other by a pivotal joint G, and the vertical rod F is moved up and down to move the door A. It is disclosed that it is configured to open and close.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, the upper side of the door A is moved by the rotation of the roof member C, and the lower center of the door A is moved about the pin D position. Therefore, the entire door A is moved along the upper surface of the roof. It cannot be stored compactly, and the swing range of the door A during opening and closing operations is large, and even when the door A is fully open, the lower part of the door A pops out of the rear part of the luggage box B, so the luggage box In places such as narrow roads where there is no space at the rear of A, there was the problem that not only could Door A not be fully opened, but it would also hinder traffic.

Therefore, an object of the present invention is to provide a door opening / closing device for a freight vehicle, which can compactly store an opened / closed door in the upper part of a luggage box and has a narrow turning range.

[0005]

[Means for Solving the Problems]

 According to the present invention, a door is provided in an opening formed in a packing box, a first rotating arm is connected to a center of the door so as to be rotatable and movable in a height direction of the door, and a second arm is provided below the door. A pivot arm is pivotally mounted, and these pivot arms are pivotally attached to the luggage box, and the door is pivotably provided on the top of the luggage box. The first and second pivot arms are synchronized with each other. It is provided with a rotation transmission mechanism that rotates.

Further, the present invention is configured such that the packing box is divided into upper and lower parts so as to be expandable / contractible in a height direction, and an expanding / contracting device for expanding and contracting the packing box is provided. A link mechanism for rotating the arm is provided, the link mechanism is connected to the lower cargo box, and the door is opened and closed by expanding and contracting the cargo box.

[0007]

[Action]

 With the above configuration, both pivoting arms pivot at a constant angular velocity ratio, and when the door is opened, the connection point between the first pivoting arm and the door moves relatively below the door, and the door is smoothed. The door opens and closes in a small turning range.

Further, by connecting the link mechanism to the lower luggage box, the door provided in the upper luggage box opens and closes as the upper luggage box moves up and down.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 5 show a first embodiment of the present invention, in which an opening 3 is formed on an upper side of a luggage box 2 of a freight vehicle 1 and a door 4 for closing the opening 3 is provided. A guide groove portion 5 is formed in each of the both sides of the door 4 substantially in the center in the height direction, and a guide roller 7 rotatably provided at the lower end of the first rotating arm 6 is provided with the guide groove portion 5. The lower end of the second rotating arm 8 is pivotally attached to the lower portions of both sides of the door 4, and the upper end of the first rotating arm 6 is connected to the luggage box 2 so as to be movable along the inside. A second rotary shaft 10 which is rotatably connected to the load box 2 via a first rotary shaft 9 which is pivotally supported by the second rotary arm 8 and whose upper end is pivotally supported by the load box 2. The door 4 is rotatably connected to the luggage box 2 via the so that the door 4 can pivot from the position of the opening 3 to the upper surface of the luggage box 2. As shown in FIG. 4, the first rotary shaft 9 is formed to have a length substantially equal to the length of the luggage box 2 in the front-rear direction, so that the first rotating arm 6 on the front side of the luggage box 2 can be rotated. The transmission is transmitted to the first rotating arm 6 on the rear side of the box 2. The length of the first rotating arm 6 is slightly longer than the length between the first rotating shaft 9 and the corner portion 2A of the packing box 2, and the length of the second rotating arm 8 is It is set to be slightly longer than the length between the second rotating shaft 10 and the corner portion 2A of the packing box 2. A first sprocket 11 and a second sprocket 12 are axially mounted on the first rotating shaft 9 and the second rotating shaft 10, respectively, and a chain 13 is hung on these both sprockets 11 and 12. The diameter ratio between the two sprockets 11 and 12 is set in inverse proportion to the turning angles θL and θS of the first and second turning arms from the door closed position to the door storage position. The first and second sprockets 11 and 12 and the chain 13 constitute a rotation transmission mechanism 14 for synchronously rotating the first and second rotation arms 6 and 8 at a constant angular velocity ratio. ing. The lower end of the first link rod 15 is fixed to the second rotating shaft 10, and the upper end of the first link rod 15 is pivotally attached to the upper end of the vertically elongated second link rod 16. The lower end of the second link rod 16 is pivotally attached to the tip side of a horizontally long operation lever 17, and the rear end of this operation lever 17 is rotatably provided around a fulcrum 18 at the lower center of the luggage box 2. Reference numeral 19 in the figure denotes a stopper that restricts downward rotation of the operation lever 17. The first and second link rods 15 and 16 and the operating lever 17 constitute an operating portion 20. Further, G in the figure is a slide type door that moves up and down along a pair of posts H, H.

Next, the operation of opening and closing the door will be described. First, when the operation lever 17 is turned downward by holding the tip of the operation lever 17, the second rotary shaft 10 is turned via the second and first link rods 16 and 15, and the front portion of the luggage box 2 is rotated. The second rotation arm 8 of the load box 2 is rotated, and the first rotation arm 6 at the front part of the load box 2 is rotated by the rotation transmission mechanism 14, and the load box 2 is moved through the first rotation shaft 9. The first rotating arm 6 at the rear part is rotated, and the second rotating arm 8 at the rear part of the luggage box 2 is rotated by the rotation transmission mechanism 14. As a result, the front and rear rotating arms 6 and 8 rotate at a constant angular velocity ratio, and the door 4 is stored parallel to the upper surface of the luggage box 2 in a small turning range along the corner 2A. In this case, the lower end of the first rotating arm 6 moves relatively below the door 4 along the guide groove portion 5 due to the rotation, and the door 4 swivels smoothly, and the door 4 moves in the packing box. Rotate upward while passing the shortest distance of the corner portion 2A of 2.

As described above, in the present invention, the door 4 is provided in the opening 3 formed in the luggage box 2, and the first rotating arm 6 is rotated in the center of the door 4 and the door 4 is moved in the height direction. The second pivot arm 8 is pivotally attached to the lower portion of the door 4, and the pivot arms 6 and 8 are pivotally attached to the luggage box 2 so that the door 4 is pivotably provided on the upper portion of the luggage box 2. The first and second rotating arms 6 and 8 are provided with the rotation transmitting mechanism 14 that rotates in synchronization with each other. The door 4 is rotated at a constant angular velocity ratio, and when the door 4 is opened, the connecting portion between the first rotating arm 6 and the door 4 is relatively moved below the door 4, and the door 4 smoothly swivels, The door 4 can be opened and closed within a small swivel range, which allows the door 4 to be opened and closed without any space and can be safely opened without obstructing surrounding traffic. It is possible to perform the opening and closing of the. In addition, the first rotating arm 6 is connected to the center of the door 4 so as to be rotatable and movable in the height direction of the door 4, and the second rotating arm 8 is pivotally attached to the lower part of the door 4 to store the door. At the same time, the entire door 4 can be stored on the roof of the luggage box 2 and the first rotating arm 6 is connected so as to be movable in the height direction of the door 4, so that the door 4 can be placed on the roof of the luggage box 2. Can be stored in parallel.

In addition, as an effect of the embodiment, the first rotating shafts 9 rotate the first rotating arms 6 and 6 at the front and rear of the luggage box 2 at the same time to move the rotating arms 6, 6, 8 and 8. Since it is turned at the same time, the door 4 can be smoothly opened and closed.

6 to 9 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. The carton 2 of the automobile 1 is vertically divided into an upper carton 21 and a lower carton 22, and a hydraulic cylinder 23, which is an expansion and contraction device fixed to the lower carton 22, lifts and lowers the upper carton 21. The box 2 is expandable. The first link rod 15 and the second link rod 16 constitute a link mechanism 24, and the lower end of the second link rod 16 is connected to the front side of the lower cargo box 22 on the fixed side via the pivot 25. is doing. In the figure, 22A is the floor of the packing box 2.

When the upper luggage box 21 is lifted by the hydraulic cylinder 23, the second rotating arm 8 at the front of the upper luggage box 21 is rotated via the link mechanism 24 as shown in FIGS. 6 and 8. . The rotation transmitting mechanism 14 rotates the first rotating arm 6 at the front portion, and further the first rotating arm 6 at the rear portion rotates via the first rotating shaft 9, and thus the rotation transmitting mechanism The second rotating arm 8 at the rear part is rotated by 14. As a result, both the front and rear pivot arms 6 and 8 simultaneously pivot at a constant angular velocity ratio, and the door 4 pivots along the corner 2A in a small pivot range, and as shown in FIG. Stored in parallel.

As described above, according to the present invention, the freight vehicle 1 is provided with the hydraulic cylinder 23 that is an expansion and contraction device that expands and contracts the cargo box 2 by dividing the cargo box 2 into upper and lower parts so as to expand and contract in the height direction. The door 4 is provided in the opening 3 formed on the side of the upper packing box 21, and the first rotating arm 6 is connected to the center of the door 4 so as to rotate and move in the height direction of the door 4. Second pivot arm 8 is pivotally attached to the lower part of 4, and pivot arms 6 and 8 are pivotally attached to luggage box 2 so that door 4 is pivotably provided on top of luggage box 2. A rotation transmission mechanism 14 for rotating the rotation arms 6 and 8 of the second rotation arm 8 in synchronization with each other is provided, and a link mechanism 24 for rotating the second rotation arm 8 is provided. Since the doors 4 are connected to each other to open and close the door 4 by expanding and contracting the cargo box 2, when the upper cargo box 21 is moved up and down, both rotating arms 6 and 8 are moved. The door 4 is rotated at a constant angular velocity ratio, and when the door 4 is opened, the connecting portion between the first rotating arm 6 and the door 4 moves relatively below the door 4 so that the door 4 smoothly turns. The door 4 can be opened and closed in a small turning range, and the same operation and effect as those of the first embodiment can be obtained. Moreover, the operator does not need to operate the lever for opening and closing the door, and the upper and lower loading boxes 21 can be moved up and down. Thus, the door 4 is automatically opened and closed.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, an example was shown in which an opening was formed on the side surface of the packing box, but this opening was formed on the rear surface of the packing box, and the door of the present invention was installed in the opening on the rear surface. Good. Further, in the embodiment, a hydraulic cylinder is used as the expansion / contraction device, but various types such as an air cylinder can be used. The door opening / closing device of the second embodiment has a lower loading box on the fixed side. On the other hand, it can be applied to various types as long as the upper cargo box can be moved up and down. Further, the rotation transmission mechanism can be constituted by a toothed pulley and a toothed belt instead of the sprocket and the chain.

[0017]

[Effect of the device]

 According to the present invention, a door is provided in an opening formed in a packing box, a first rotating arm is connected to a center of the door so as to be rotatable and movable in a height direction of the door, and a second arm is provided below the door. A pivot arm is pivotally mounted, and these pivot arms are pivotally attached to the luggage box, and the door is pivotably provided on the top of the luggage box. The first and second pivot arms are synchronized with each other. Since the swing transmission mechanism is provided, the opened / closed door can be compactly stored in the upper part of the luggage box, and the door opening / closing device of the freight vehicle having a narrow turning range can be provided.

Further, the present invention is configured such that the packing box is divided into upper and lower parts so that the packing box can be expanded and contracted in a height direction, and an expansion and contraction device for expanding and contracting the packing box is provided. A link mechanism for rotating the arm is provided, and the link mechanism is connected to the lower cargo box to open and close the door by expanding and contracting the cargo box. It is possible to provide a door opening / closing device for a freight vehicle that can be compactly stored, has a narrow turning range, and can be opened and closed by expanding and contracting a luggage box.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a first embodiment of the present invention.

FIG. 2 is an enlarged explanatory view showing the first embodiment of the present invention.

FIG. 3 is a diagram for explaining the turning operation of the door according to the first embodiment of the present invention.

FIG. 4 is a perspective view of the first embodiment of the present invention during opening and closing of the door.

FIG. 5 is a perspective view showing a first embodiment of the present invention.

FIG. 6 is an explanatory view showing a second embodiment of the present invention before expansion / contraction of the luggage box.

FIG. 7 is an explanatory view showing the second embodiment of the present invention while the upper luggage box is being raised.

FIG. 8 is an explanatory view showing the second embodiment of the present invention after the upper luggage box is lifted.

FIG. 9 is a perspective view of the second embodiment of the present invention during opening and closing of the door.

FIG. 10 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Lorry 2 Cargo Box 3 Opening 4 Door 6 First Rotating Arm 8 Second Rotating Arm 14 Rotation Transmission Mechanism 20 Operation Unit 21 Upper Packing Box 23 Hydraulic Jack (Extractor) 22 Lower Packing Box 24 Link mechanism

Claims (2)

[Scope of utility model registration request] 1. A door is provided at an opening formed in a packing box, a first rotating arm is connected to a center of the door so as to be rotatable and movable in a height direction of the door, and a first portion is provided at a lower portion of the door. Two pivoting arms are pivotally attached, the pivoting arms are pivotally attached to the luggage box, and the door is pivotably provided on the upper portion of the luggage box. The first and second pivoting arms are synchronized with each other. A door opening / closing device for a freight vehicle, which is provided with a rotation transmission mechanism that rotates. 2. An expansion / contraction device for expanding / contracting the packing box by vertically dividing the packing box so as to expand and contract in the height direction,
A structure is provided in which the door is provided in the upper luggage box, a link mechanism for rotating the rotating arm is provided, the link mechanism is connected to the lower luggage box, and the door is opened and closed by expansion and contraction of the luggage box. The door opening / closing device for a lorry according to claim 1, wherein