JP4823143B2 - Box type rear door sliding device - Google Patents

Description

  The present invention relates to a box-type loading platform mounted on a vehicle such as a truck, and a rear door slide for storing a rear door provided at the rear for loading and unloading cargo by sliding it to the side of the box-type loading platform when opened. It relates to the device.

  Truck loading platforms, which are vehicles for freight transportation, include an uncovered loading platform that opens upward, a hexahedral box-shaped loading platform that has a roof and is hermetically sealed. In recent years, box-type loading platforms, that is, van bodies, that can prevent damage to cargo due to wind and rain, simplify packaging, and easily prevent load slippage, that is, van bodies, have become widespread. Among the box-type loading platforms, there is also a loading platform called a wing body that has a flip-up roof and can load and unload cargo from the side of the loading platform for the purpose of rationalizing loading and unloading operations such as loading and unloading cargo.

  In a box-type loading platform, a double door rear door is usually provided at the rear of the loading platform, and cargo is loaded and unloaded by opening the rear door. A quadrilateral rear frame that attaches the rear door is installed at the rear of the loading platform, and each of the two rear doors is fixed to the pillars on both sides of the rear frame by a plurality of hinges at the side ends of the vehicle. It can be opened in double doors. A lock rod that holds the rear door in the closed position is attached to the end of the two rear doors on the center side of the vehicle. The upper and lower ends of the lock rod are connected to the upper and lower beams of the rear frame when the rear door is closed. It is fixed to a fixed receiver (cam keeper). Such a rear door is also provided on the wing body.

  When loading and unloading cargo by opening the rear door, remove the lock rod from the upper and lower cam keepers, rotate the rear door 270 °, and place the rear door close to the side of the loading platform in parallel. The rear door is held by a fastener. Therefore, when the rear door is opened, a space for rotating 270 ° is required, but there may be no space depending on the place of loading and unloading. For example, in a distribution center or cargo terminal where a platform for loading and unloading cargo is installed, if a large number of trucks are parked side by side with the platform in contact with the rear, and the distance between each other is narrow, adjacent trucks will be obstructed. The rear door cannot be rotated 270 °. Further, when the rear door is opened and closed, the door largely protrudes to the outside of the vehicle, which hinders the passage of other vehicles on the road.

To deal with these problems, when opened, the rear door is rotated 90 ° in parallel with the side of the box-type carrier, and the rear door is slid forward along the side of the carrier, so that the side of the box-type carrier There is a slide device to house. A box-type cargo bed equipped with such a rear door sliding device is disclosed as an example in Japanese Patent Application Laid-Open No. 9-112121, and an example in which a wing body is equipped with a rear door sliding device is a registered utility model. This is disclosed in Japanese Patent No. 2517989. FIG. 8 and FIG. 9 show a box-type cargo bed provided with a sliding device for the rear door disclosed in Japanese Patent Laid-Open No. 9-112121.
As shown in FIG. 8, a quadrilateral rear frame 2 composed of struts 21, 21 and upper beams 22 and lower beams 23 on both sides is installed at the rear of the box-type carrier 1 mounted on the vehicle. The frame 2 is provided with two rear doors 3 and 3 that are fitted into the space of the rear frame 2. A lock rod 4 for closing the door is attached to an end of each rear door 3 on the vehicle center side. The lock rod 4 is a round bar having high rigidity, and is provided with locking cam bodies at the upper and lower ends thereof, and these cam bodies are attached to the upper beam 22 and the lower beam 23 of the rear frame 2 when the door is closed. The cam keepers 41 and 41 are fixed to each other. A gasket for sealing between the rear frame 2 and the rear frame 2 is provided around the rear door 3.

  The rear door 3 is a door that opens and closes in a double-spreading manner, and is configured to slide forward along the side surface of the cargo bed with the door rotated 90 ° and parallel to the side surface of the box-type cargo bed when opened. Has been. Therefore, an upper hinge 5A and a lower hinge 5B are attached to an upper portion and a lower portion of the vehicle side end portion of the rear door 3, and rollers fixed to these hinges are attached to the upper portion and the lower portion of the side panel 6. An upper rail 6A and a lower rail 6B are provided. The upper hinge 5A and the lower hinge 5B are mechanically equivalent. As shown in FIG. 9 of the lower hinge 5B, the door-side hinge piece 51 in which the hinge pin insertion portion is formed, and the hinge pin insertion portion is also the same. The side-side hinge piece 52 is formed, and the hinge pin 53 is inserted into both hinge pin insertion portions and assembled.

Two rollers 54 are attached to the back surface of the side hinge piece 52, and these rollers 54 are fitted into the lower rail 6B. When opening the rear door 3, the lock rod 4 is rotated to disengage the upper and lower cam bodies, and then the door is rotated 90 ° to be parallel to the side surface of the box-type cargo bed. The door-side hinge piece 51 is in a state of a two-dot chain line in the cross section of FIG. When the door is pushed forward in this state, the rear door 3 slides forward along the side surface of the cargo bed and is housed in the side surface while the roller 54 of the side hinge piece 52 is guided by the lower rail 6B and slides. The The hinge pin 53 is extended above the hinge pin insertion portion, and a holding block 24 that accommodates the extension portion is fixed to the support column 21 of the rear frame 2 so that the rear door 3 is closed or rotated. When moving, the position of the hinge pin 53 is positioned by the holding block 24. Further, two intermediate hinges 7 (FIG. 8) are attached between the upper hinge 5A and the lower hinge 5B of the rear door 3. When the rear door 3 is closed, the intermediate hinge 7 is attached to the side panel 6. Engages with the fixed hinge receiver.
JP-A-9-112121 Utility Model Registration No. 2517989

  A box-type carrier of a vehicle receives various loads due to vibrations or the like while the vehicle is running. The rear frame to which the rear door is attached is a quadrilateral frame with beams and struts arranged at the periphery, and the upper frame is secured to improve the workability by securing a space area for loading and unloading cargo. A member having a small rear width (W in FIG. 8) is used for the beam and the right and left columns. Therefore, the rear frame is likely to be deformed due to severe vibration or the like when the vehicle travels on rough terrain. The distortion or deformation of the rear frame may also be caused by loading cargo in a box-type loading platform.

  The rear frame of a normal box-type carrier is fixed to a rigid lock rod through the cam body and cam keeper at the center of the upper and lower beams, and to the rear door by the lock rod. A column is secured to the end of the rear door via a plurality of hinges. Therefore, when the rear frame is deformed by a load caused by vibration or the like, the load is distributed to the rear door via the plurality of hinges and the lock rod. Since the rear door is a flat plate-like body, it has a high resistance to in-plane loads and hardly deforms. That is, in a normal box-type cargo bed, the rear door acts as a reinforcing material and prevents the rear frame from being deformed.

However, in the case of a box-type cargo bed that slides the double doors rear door forward along the side of the cargo bed, the hinges are fixed to the left and right columns of the rear frame because the upper hinge and the lower hinge are slid together with the rear door. (Incidentally, the intermediate hinge 7 in FIG. 8 or the holding block 24 in FIG. 9 is open in one direction for sliding, and does not fix the rear door to a column or the like). For this reason, the rear door cannot be used as a reinforcing member, and the amount of deformation of the rear frame becomes large in a box-type cargo bed provided with a sliding device for the rear door. When the amount of deformation increases, cracks may occur particularly in the corner portion of the rear frame where stress is concentrated, that is, in the joint portion between the upper and lower beams and the left and right columns. Further, the mechanism for rotating and sliding the rear door is deformed, and the operation of the rear door is not smooth. In some cases, the operation itself is impossible.
An object of the present invention is to solve the above-mentioned problems by preventing deformation of a rear frame to which a rear door is attached in a box-type cargo bed provided with a slide device that houses the rear door on the side surface of the cargo bed when opened.

In view of the above problems, the present invention is a box-type cargo bed that is opened and closed by a hinge in a double-spread manner, and has a slidable rear door attached to the rear frame, and integrally fixing the protruding cam body to the hinge piece, Reinforcement structure of the rear frame with a simple structure by fixing the cam holder, which has an opening on the side of the box-type loading platform, and the protruding cam body is fitted when the rear door is closed, to the support of the rear frame Is realized. That is, the present invention
“A box-type loading platform mounted on a vehicle, two slidable rear doors that are opened and closed by hinges, and a rear frame that fits and attaches the rear door when the rear door is closed , With
The hinge has a door-side hinge piece fixed to the rear door, and a side-side hinge piece connected to the door-side hinge piece by a hinge pin,
The door-side hinge piece has a door fixing portion that fixes the rear door and a bent portion that is bent at a right angle from the door fixing portion, and the hinge pin is inserted into a distal end portion of the bent portion,
The side hinge piece slides with the door hinge piece along a rail installed on the side of the box-type cargo bed when the rear door is opened, and the rear door is stored on the side of the box-type cargo bed. In addition,
A protruding cam body is integrally fixed to the bent portion of the door-side hinge piece, and the support of the rear frame has an opening on a side surface of the box-type cargo bed, and the protruding cam body Is fixed so that when the rear door is closed, the protruding cam body is fitted so as to contact the cam holder, and the door-side hinge piece is coupled to the rear frame. ''
It is a box-type cargo bed characterized by this.

  According to a second aspect of the present invention, curved surfaces are formed on both sides of the protruding cam body, and two cylindrical bodies are fixed to the cam receiver, and the protruding cam body is moved when the rear door is closed. It is preferable to fit between the cylindrical bodies, and to connect the door-side hinge piece to the rear frame, with the curved surfaces on both sides of the protruding cam body contacting the side surfaces of the cylindrical bodies.

  According to a third aspect of the present invention, the cam holder is provided with an upper plate and a lower plate, and the distance between the upper plate and the lower plate is slightly smaller than the vertical dimension of the protruding cam body. It is preferable to set a large value.

  The hinge is attached to an upper part and a lower part of the rear door, an intermediate hinge piece fixed to the rear door is attached between the hinges, and the intermediate hinge piece is attached to the rear part. A door fixing portion for fixing the door and a bent portion bent at a right angle from the door fixing portion, and an intermediate hinge protrusion cam body is integrally fixed to the bent portion; The intermediate hinge protrusion cam is closed when the rear door is closed by fixing an intermediate hinge cam receiver having an opening on a side surface of the box-type loading platform and having the intermediate hinge protrusion cam body fitted therein. The body can be fitted in contact with the intermediate hinge cam holder and the intermediate hinge piece can be coupled to the rear frame.

  In a box-type cargo bed that stores a rear door that opens and closes in a double-folded manner by a hinge when the door is opened, the door-side hinge piece fixed to the rear door is generally a side surface that slides along the rail on the side of the box-type cargo bed. A hinge pin is connected to the side hinge piece. In the present invention, the door-side hinge piece has a bent portion into which a hinge pin is inserted at the front end portion, and the protruding cam body is integrally fixed to the bent portion, and the protruding cam body is attached to the column of the rear frame. The cam receiver for fitting is fixed, and when the rear door is closed, the protruding cam body is fitted so as to come into contact with the cam receiver. Therefore, when the vehicle is traveling with the rear door closed, the door-side hinge piece is firmly coupled to the rear frame by the protruding cam body and the cam holder, and the load that deforms the rear frame caused by vibration during traveling is not , Distributed to the rear door through the door-side hinge piece. That is, the rear door functions as a reinforcing member for the rear frame, and deformation of the rear frame is suppressed, so that the occurrence of cracks at the corner portion can be prevented. Further, distortion and deformation of the sliding device for the hinge pin for opening / closing the rear door and the side hinge piece are prevented, and smooth operation of the rear door is ensured.

The door-side hinge piece of the present invention has a bent portion that bends at right angles, and a hinge pin is inserted at the tip thereof, and the hinge pin is disposed on the side of the box-type cargo bed. The total length is not limited by the hinge pin. The protruding cam body is fixed to the bent portion, and the cam receiver into which the protruding cam body is fitted is attached to the support of the rear frame so as to open to the side surface side of the box-type loading platform.
Since the column of the rear frame has a columnar member with a small width on the rear surface of the column in order to widen the cargo loading / unloading opening, the cam holder of the present invention is on the side of the column, so the width of the rear surface However, the cam receiver having a sufficient size and strength can be used. In addition, the opening of the cam receiver on the side face is covered with the rear door when loading and unloading cargo, so the operator's hand is caught in the opening during loading and unloading work etc. There is no fear, and safe work can be performed.

  The invention according to claim 2 is provided with a cam holder that fixes two cylindrical bodies, and when the rear door is closed, the protruding cam body is fitted between the cylindrical bodies, and the door side hinge piece is coupled to the rear frame. Is. In this case, the cam receiver is constituted by two cylindrical bodies, and a cam receiver having a simple structure and high strength and rigidity can be obtained. When the rear door is closed, the curved surfaces formed on both sides of the protruding cam body come into contact with the circumferential surface of the cylindrical body. However, since the cylindrical body has a certain elasticity, the protruding cam body and the cylindrical body are strong against each other. A large frictional force acts between the two by pressure contact, and the door-side hinge piece and the rear frame are firmly coupled. When the upper plate and the lower plate are provided on the cam holder and the distance between the upper plate and the lower plate is set slightly larger than the vertical dimension of the protruding cam body, The relative movement in the vertical direction between the cam body and the cam receiver is mechanically restricted by the upper plate and the lower plate in addition to the frictional force. Therefore, the movement of the protruding cam body is restrained in both the vertical and horizontal directions and is fixed to the cam holder, so that the rear frame is firmly connected to the rear door, and the rear frame is deformed when the vehicle is running. Can be reliably prevented.

According to a fourth aspect of the present invention, the door-side hinge piece for sliding the rear door is attached to the upper part and the lower part of the rear door, an intermediate hinge piece is fixed between them, and the upper and lower doors are closed when the rear door is closed. The support of the rear frame is fixed to the rear door by the intermediate hinge piece together with the side hinge piece. Due to the intermediate hinge piece, the rear frame is coupled to the rear door even at the intermediate portion, and the reinforcing action by the rear door is more reliable.
The intermediate hinge piece does not have a hinge pin, but like the door side hinge piece, it has a bent portion that bends at right angles from the door fixing portion, and the intermediate hinge protrusion cam body is integrally fixed to the bent portion. The intermediate hinge protrusion cam body is fitted into an intermediate hinge cam support provided on the column of the rear frame. The intermediate hinge piece, the intermediate hinge protrusion cam body, and the intermediate hinge cam receiver are equivalent to the door side hinge piece, the protrusion cam body, and the cam holder in terms of function and action, and use common parts. This can reduce manufacturing costs and the like.

  Hereinafter, a sliding device for a rear door of the present invention will be described with reference to the drawings. FIG. 1 partially shows the rear part of a box-type carrier equipped with the slide device of the present invention, but the box-type carrier of the present invention is different from the box-type carrier of FIG. 8 in the basic structure. Instead, in FIG. 1, corresponding parts and the like are denoted by the same reference numerals as those in FIG. 8. In order to facilitate understanding, the rear panel is removed from the side panel.

  The rear frame 2 installed at the rear part of the box-type cargo bed is a quadrilateral frame body including support columns 21 and 21 on both sides, an upper beam 22 and a lower beam 23. As shown in the sectional view of FIG. 2 and the like, the column 21 is formed by joining columnar members extending in the vertical direction with different cross sections by welding or the like. A lock rod 4 for closing the door is attached to the rear door 3 fitted in the rear frame 2, and the upper and lower cam bodies are fixed to the upper and lower portions of the rear frame 2 when the door is closed. It is fixed to the cam keeper 41, 41.

  In FIG. 1, the rear door 3 is a door that can be opened and closed in a double door manner and slid forward along the side surface of the box-type loading platform 1. The upper hinge 5A and the lower hinge 5B are attached. Further, an upper rail 6A and a lower rail 6B having a so-called cross section are provided at the upper and lower portions of the side panel 6, and these hinges and the rear door 3 are connected to the upper rail 6A and the lower rail 6B. Guided and slides forward. Unlike the slide device of FIG. 8, the lower rail 6B of this embodiment is attached in a form embedded in the side panel 6, and this point is common to the method of attaching the upper rail 6A. Therefore, parts having the same shape can be used for the upper hinge 5A and the lower hinge 5B, and the parts can be shared.

The configuration of the upper hinge 5A of the present invention (the same applies to the lower hinge 5B) will be described with reference to FIG. 2, which is a detailed view of the AA cross section of FIG. FIG. 2 shows the state of the upper hinge 5 </ b> A when the rear door 3 is closed. Moreover, the assembly drawing etc. of the main components which comprise the upper hinge 5A are shown in FIGS.
The upper hinge 5 </ b> A has a door-side hinge piece 51 fixed to the rear door 3 and a side-side hinge piece 52 connected to the door-side hinge piece 51 by a hinge pin 53. The door-side hinge piece 51 (see FIG. 3) includes a door fixing portion 51A that is fixed to the rear door 3 with a bolt and a bent portion 51B that is bent at a right angle from the door fixing portion 51A. Fixed to. In this embodiment, the door fixing portion 51A and the bent portion 51B are separate components and are integrally coupled with bolts, but both may be formed as one component. A hinge pin 53 is inserted into the distal end portion of the bent portion 51 </ b> B, and the door-side hinge piece 51 is connected to the side-side hinge piece 52 by the hinge pin 53.

  The side hinge piece 52 (see FIG. 4) includes a connecting portion 52A into which the hinge pin 53 is inserted, and a slide plate 52B integrally coupled to the connecting portion 52A by a bolt, and a roller is provided on the back surface of the slide plate 52B. 54 is attached. The roller 54 is inserted into a recess having a hat-shaped cross section of the upper rail 6A embedded in the side panel 6 and is fitted into a linear rail protrusion formed in the recess. The slide plate 52B and the connecting portion 52A into which the hinge pin 53 is inserted can be formed as one component.

  In the present invention, a tongue-like protruding cam body 51D is integrally fixed to the bent portion 51B of the door-side hinge piece 51, and the position facing the protruding cam body 51D on the side surface side of the column 21 of the rear frame 2 is fixed. Is provided with a cam holder 55 into which the protruding cam body 51D is fitted. The cam receiver 55 (see FIG. 5) includes an upper plate 55A and a lower plate 55B, and an extension for fixing to the support column 21, and two pieces extending in the vertical direction between the upper plate 55A and the lower plate 55B. The cylindrical body 55C is fixed. The distance between the upper plate 55A and the lower plate 55B is set slightly larger (about 1 mm) than the vertical dimension (H in FIG. 3) of the protruding cam body 51D.

  When the rear door 3 is closed, as shown in FIG. 2, the protruding cam body 51D enters between the two cylindrical bodies 55C so that the curved surfaces on both sides thereof are in contact with the side surfaces of the respective cylindrical bodies 55C. . At this time, the protruding cam body 51D slightly widens the interval between the cylindrical bodies 55C, and the two are strongly pressed by the elasticity of the cylindrical body 55C. A large frictional force is generated between them, and the door-side hinge piece 51 and the rear frame column 21 are firmly coupled. Furthermore, the relative movement in the vertical direction between the protruding cam body 51D and the cam receiver 55 is mechanically restricted by the upper plate 55A and the lower plate 55B serving as stoppers. Therefore, the rear door 3 functions as a reinforcing material for the rear frame 2, and deformation of the rear frame 2 due to vibrations during traveling of the vehicle is suppressed, and the occurrence of cracks in the corner portion is prevented. Further, since the load of the rear frame 2 is mainly transmitted to the rear door 3 through the protruding cam body 51D, the distortion of the sliding device of the hinge pin 53 and the side hinge piece 52 is prevented, and the rear door is smoothly operated. Is secured.

  The door-side hinge piece 51 has a bent portion 51B that bends at a right angle, and the hinge pin 53 is disposed on the side of the box-type cargo bed, and it is not necessary to place a space for placing the hinge pin at the rear of the cargo bed. The total length of the box-type carrier for loading the is not limited by the hinge pin. The protruding cam body 51D is fixed to the bent portion 51B, and the cam receiver 55 into which the protruding cam body 51D is fitted is fixed to the rear frame column 21 so as to open to the side surface side of the box-type cargo bed 1. . As a result, the opening of the cam receiver 55 is not exposed, and the width of the rear surface of the column 21 is not increased by the cam receiver 55, so that the opening for unloading cargo is not narrowed.

Next, the operation of the rear door sliding device of the present invention, such as the rear door opening / closing operation, will be described with reference to FIG.
When the rear door 3 in the state of FIG. 2 is opened at the time of closing, the lock rod 4 is rotated to remove the upper and lower cam bodies from the cam keeper 41 and the handle of the lock rod 4 is pulled backward. The rear door 3 and the door-side hinge piece 51 rotate around a hinge pin 53 located on the side surface of the box-type cargo bed. When the state shown in FIG. 6A is reached, the curved surfaces on both sides of the protruding cam body 51D are cam receivers. The engagement between the projection cam body 51D and the cam receiver 55 is released from the side surface of the 55 cylindrical body 55A. When the rear door 3 is rotated by 90 °, the opening is completed, and as shown in FIG. 6B, the rear door 3 is in a state parallel to the side surface of the box-type cargo bed.

  In the position shown in FIG. 6B, the upper hinge 5A including the hinge pin 53 and the like is slidable, and when the rear door 3 is pushed forward, the roller 54 attached to the slide plate 52B of the side hinge piece 52 is moved upward. Sliding along the rail 6A, the rear door 3 is housed on the side surface of the box-type cargo bed. At this time, the protruding cam body 51D moves in the hat-shaped cross-sectional recess of the upper rail 6A together with the hinge pin 53, so that the tip of the protruding cam body 51D does not interfere with the surface of the side panel 6.

In the embodiment of the present invention shown in FIG. 1, two intermediate hinge pieces 7 are provided between the upper hinge 5 </ b> A and the lower hinge 5 </ b> B of the rear door 3. Is shown in FIG. FIGS. 7A and 7B show the closed state of the rear door 3 and the state when the opening is completed.
The intermediate hinge piece 7 has a bent portion bent at a right angle from the door fixing portion, like the door-side hinge piece 51 of the upper hinge and the lower hinge, and the intermediate hinge protrusion cam body 71 is integrally fixed to the bent portion. Is done. However, the intermediate hinge piece 7 does not include a hinge pin, and rotates together with the rear door 3 around the hinge pin 53 of the upper hinge and the lower hinge when the rear door 3 rotates. Further, an intermediate hinge cam receiver 72 is fixed to a position of the rear frame column 21 facing the intermediate hinge protrusion cam body 71, and the intermediate hinge cam receiver 72 is similar to the cam receiver 55 in the vertical direction. Two cylindrical bodies 72A fixed between the plates are provided.

When the rear door 3 is closed, as shown in FIG. 7A, the intermediate hinge protrusion cam body 71 is fitted into the intermediate hinge cam receiver 72, and the curved surfaces on both sides of the intermediate hinge protrusion cam body 71 are on the side surface of the columnar body 72A. Press contact. Therefore, the column 21 of the rear frame is firmly coupled to the rear door 3 even in the middle portion, and the reinforcing action of the rear frame by the rear door 3 becomes more reliable. When the rear door 3 is rotated 90 ° and opened, the state shown in FIG. 7B is obtained, and the intermediate hinge piece 7 moves forward along the side surface of the box-type cargo bed as the rear door 3 slides. To do.
Thus, the intermediate hinge piece 7, the intermediate hinge projection cam body 71, and the intermediate hinge cam receiver 72 are respectively connected to the door side hinge piece 51, the projection cam body 51D, and the cam receiver 55 of the upper hinge in terms of function and action. Corresponding parts are used as corresponding parts. However, since the intermediate hinge protrusion cam body 71 moves on the surface of the side panel 6 when moving forward along the side surface of the loading platform, the intermediate hinge protrusion cam body 71 includes a protrusion cam body in order to avoid interference therebetween. What cut | disconnected the front-end | tip part of 51D is used.

As described in detail above, the present invention is a box-type cargo bed that can slide a rear door that can be opened and closed in a double-spreading manner. The protruding cam body is integrally fixed to the hinge piece for opening and closing, and the rear door is attached. The rear frame support is secured to the side frame of the rear frame by fixing a cam receiving member into which the protruding cam body is fitted when the rear door is closed. By providing two cylindrical bodies in contact with the projecting cam body on the cam receiver, a reinforcing structure for the rear frame can be realized with a simple configuration.
In the above-described embodiment, a normal box-type loading platform has been described, but it goes without saying that the present invention is applicable to a wing body. In addition, for example, the protrusion cam body has a shape in which the vertical dimension decreases as it goes toward the tip, and a slide rail for the lower hinge is installed on the lower side of the box-type loading platform. It is clear that the deformation of is possible.

It is a figure which shows the rear part of the box-type loading platform provided with the rear door slide apparatus of this invention. It is sectional drawing (AA cross section) of the upper hinge part of this invention. It is a figure which shows the door side hinge piece of this invention. It is a figure which shows the side hinge piece of this invention. It is a figure which shows the cam receiver of this invention. It is a figure which shows the action | operation of the upper hinge of this invention. It is a figure which shows the action | operation of the intermediate | middle hinge piece of this invention. It is a figure which shows the box-type loading platform provided with the conventional rear door slide apparatus. It is a figure which shows the hinge part of the conventional rear door slide apparatus.

Explanation of symbols

2 Rear frame 21 Post 3 Rear door 4 Lock rod 5A Upper hinge 5B Lower hinge 51 Door side hinge piece 51A Door fixing part 51B Bent part 51D Projection cam body 52 Side side hinge piece 52B Slide plate 53 Hinge pin 54 Roller 55 Cam holder 55C Cylindrical body 6 Side panel 6A Upper rail 6B Lower rail 7 Intermediate hinge piece 71 Intermediate hinge projection cam body 72 Intermediate hinge cam holder

Claims (4)

A box-type loading platform mounted on a vehicle, comprising : two slidable rear doors that are opened and closed by hinges; and a rear frame that is fitted and attached to the rear door when the rear door is closed. Prepared,
The hinge has a door-side hinge piece fixed to the rear door, and a side-side hinge piece connected to the door-side hinge piece by a hinge pin,
The door-side hinge piece has a door fixing portion that fixes the rear door and a bent portion that is bent at a right angle from the door fixing portion, and the hinge pin is inserted into a distal end portion of the bent portion,
The side hinge piece slides with the door hinge piece along a rail installed on the side of the box-type cargo bed when the rear door is opened, and the rear door is stored on the side of the box-type cargo bed. In addition,
A protruding cam body is integrally fixed to the bent portion of the door-side hinge piece, and the support of the rear frame has an opening on a side surface of the box-type cargo bed, and the protruding cam body The cam receiver into which the door is fitted is fixed, and when the rear door is closed, the protruding cam body is inserted into contact with the cam holder, and the door-side hinge piece is coupled to the rear frame. A featured box-type carrier. Curved surfaces are formed on both sides of the protruding cam body, and two cylindrical bodies are fixed to the cam holder, and the protruding cam body is interposed between the cylindrical bodies when the rear door is closed. The box-type cargo bed according to claim 1, wherein the door-side hinge piece is coupled to the rear frame by being fitted, the curved surfaces on both sides of the protruding cam body being in contact with the side surfaces of the cylindrical bodies, respectively. The cam receiver has an upper plate and a lower plate, and an interval between the upper plate and the lower plate is set to be slightly larger than a vertical dimension of the protruding cam body. Item 3. A box-type cargo bed according to Item 2. The hinge is attached to the upper and lower parts of the rear door, and an intermediate hinge piece fixed to the rear door is attached in the middle of the hinge,
The intermediate hinge piece has a door fixing portion for fixing the rear door and a bent portion bent at a right angle from the door fixing portion, and an intermediate hinge protrusion cam body is integrally fixed to the bent portion. The rear frame column has an opening on the side surface of the box-type loading platform, and an intermediate hinge cam holder into which the intermediate hinge projection cam body is fitted is fixed, and when the rear door is closed, 4. The box-type carrier according to claim 1, wherein the intermediate hinge protrusion cam body is fitted so as to contact the intermediate hinge cam holder, and the intermediate hinge piece is coupled to the rear frame.

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