JP5078859B2 - Container chassis that can load a variety of containers - Google Patents

Description

  The present invention relates to a container chassis configured as a trailer loaded with a container as a transport container and pulled by a tractor, and more particularly, a container chassis configured so that a frame can be expanded and contracted to load various types of containers having different lengths. It is about.

  Containers used as transport containers have a robust structure to protect the cargo to be stored, and can be used repeatedly over a long period of time, making it easy to load and unload cargo. Yes. In addition, since containers can be loaded on various transportation facilities such as ships and vehicles, containers are actively used as containers for transporting various articles. For this reason, the length and other dimensions of containers are determined by international standards, etc. Recently, various types of containers with different lengths or maximum loading capacity have been used according to the diversification of container usage. Tend to be used. For example, in addition to the 20-foot (about 6 m) container and the 40-foot (about 12 m) container that are frequently used in the past, cases where a 45-foot (about 14 m) length container is also used increase. ing.

Containers are large containers, and when transported on land by vehicles, they are loaded and transported on a container chassis that is a chassis that is pulled by a tractor. The container chassis includes a frame composed of two main beams extending in parallel in the front-rear direction over the entire length and a cross member connecting them, and a cross member called a bolster installed at the front end portion and the rear end portion of the frame. At both ends, fasteners for fixing the four corners of the bottom of the container are attached.
Among container chassis, there is a container chassis configured to be able to load containers having different lengths, for example, to be used as a 20-foot container and a 40-foot container. Such a dual-purpose container chassis is long enough to accommodate a 40-foot container, and when a bolster and fasteners are installed in the middle part of the frame to load a 20-foot container, its center Load closer. This distributes the container load to the tractor axle via a coupler (container chassis and tractor connector) as the so-called fifth wheel load, ensuring the driving force of the tractor and overloading the container chassis axle. This is to avoid the axial load from acting.

  However, if a 20-foot container is loaded closer to the center in a dual-purpose container chassis, the rear end of the container cannot be brought close to the platform provided in the facility that handles container cargo. It becomes impossible to carry out cargo handling work while the container is loaded inside the container chassis. Therefore, a dual-purpose container chassis is known in which a slidable slide frame is provided at the rear part of the container chassis, and this can be expanded and contracted. As an example, Japanese Patent Application Laid-Open No. 2008-68790 (Patent) Document 1).

  As shown in FIG. 7, the container chassis disclosed in Patent Document 1 includes a main frame 101 having two main beams 100 extending from the front end to immediately after the rearmost wheel, and a slide mounted on the main frame 101. The frame 102 is divided. The slide frame 102 is assembled to the main frame 101 so as to be manually slidable using a roller or the like. At the front end of the main frame 101 and the rear end of the slide frame 102, container fixing fasteners 103A and 103D are attached to both ends of a laterally extending bolster. When loading a container having a length of 40 feet, it slides. The frame 102 is extended and the container is placed on the entire container chassis. When loading a 20-foot container, it is loaded in the center using the fasteners 103B and 103C installed in the middle of the container chassis, and when loading and unloading cargo, the slide frame 102 is mounted on the main frame 101. Shorten the rear part of the container chassis. Thereby, when the rear end of the 20-foot container is brought close to the platform and a transfer plate or the like is used, a forklift or the like can be inserted into the container from the platform. The container chassis is pulled by a tractor (not shown), and has a king pin 104 connected to a coupler of the tractor at the lower front portion.

While the container chassis disclosed in Patent Document 1 allows the rear frame to be slidable, the front frame can be slidable to expand and contract the entire length to suit different cargo sizes. A trailer that can be set is also known, and is disclosed in Japanese Patent Application Laid-Open No. 2000-62643 (Patent Document 2) as an example.
As shown in FIG. 8, the trailer frame of Patent Document 2 is divided into a rear frame 201 on which trailer wheels are mounted and a front frame 202 on which a so-called gooseneck portion 203 connected to the trailer is formed. . The rear frame 201 and the front frame 202 respectively have main beams 201A and 202A having a hollow rectangular cross section, and the main beam 202A of the front frame is slidably fitted into the main beam 201A of the rear frame. The rear frame 201 is provided with two pins 204 that can be moved by a hydraulic cylinder, and the main beam 202A of the front frame is formed with a plurality of sets of positioning holes 205 that match the interval P of the pins 204. ing. When the trailer frame is expanded and contracted, a tractor is connected to the front frame 202, and the wheels of the rear frame 201 are braked to move the tractor back and forth at a slow speed. When the two pins 204 coincide with the desired positioning hole 205, the tractor is stopped, and the pin 204 is inserted into the positioning hole 205 to fix the trailer to a set length.
JP 2008-68790 A JP 2000-62643 A

  In a dual-purpose container chassis in which a plurality of types of containers can be loaded, it is desirable to divide the frame and slide it so that the entire length can be expanded and contracted. When a short container is loaded on an extendable container chassis, shortening the slide frame at the rear improves the maneuverability of the container trailer and allows parking in a narrow place. However, if the types of containers that can be loaded are increased and the frame is configured to be extendable and retractable, the length of the slide frame becomes long and it is difficult to stably hold the container. For example, when a slide frame is installed at the rear so that three types of containers of 20 feet, 40 feet, and 45 feet can be loaded, the total length of the container chassis when the slide frame is extended is 45 feet. It is necessary to increase the length and weight of the slide frame, which makes it difficult to manually slide the slide frame. Further, since the length of the gooseneck portion increases, when a 20-foot container is loaded on the center portion of the container chassis, the load of the container distributed to the axle of the tractor via the coupler is reduced.

  In order to construct a telescopic container chassis with excellent axle load distribution while increasing the types of containers that can be loaded, a slide frame is provided at the rear of the main frame, and the front frame is also telescopic with respect to the main frame. It can be considered to be free. That is, the container chassis frame is divided into three frames, a main frame, a front frame, and a rear frame, and the front frame and the rear frame are slidably attached to the main frame. In this case, a frame having a relatively small weight that can be manually moved can be adopted as the rear frame.

However, the gooseneck that connects to the tractor and the elevating legs that support the front of the container chassis when detached from the tractor are attached to the front frame. It is impossible to slide with. To slide the front frame with respect to the main frame, as shown in Patent Document 2, the front frame is connected to the tractor by a coupler, and the tractor is moved back and forth at a slow speed while applying a brake to the wheels of the container chassis. At this time, it is extremely difficult for a skilled driver to accurately stop the tractor at the pin point position where the positioning pins and the holes coincide with each other.
An object of the present invention is to provide a container chassis in which a front frame and a rear frame are slidably attached to a main frame so that the container chassis can be expanded and contracted to accommodate various types of containers. It is to facilitate the operation of setting the position and solve the above-mentioned problems.

In view of the above problems, the present invention provides a stopper device at both end positions where the front frame is slid with respect to the main frame so that the front frame is positioned only at both end positions, and the front frame The bolster disposed at the front end of the container is configured to be attachable to different positions in the front-rear direction, and the container fastener is positioned at a plurality of positions corresponding to the length of the container. That is, the present invention
“A container chassis that is pulled by a tractor and can load containers of different lengths.
The container chassis includes a front frame provided with a coupling tool with a tractor, a main frame placed in the center, and a rear frame provided with a container bolster and extending a lateral bolster. Each of the part frame and the rear frame is configured to be stretchable by sliding with respect to the main frame, and
Between the front frame and the main frame, a stopper device is provided for restricting both end positions where the front frame slides, and a positioning device for positioning the front frame at the both end positions is provided,
The front frame is provided with two front and rear bolsters mounted with container fasteners and extending in the front-rear direction. The front-side bolster includes a front end portion of the front frame, a front end portion, and a tractor. It is configured so that it can be attached at a position between it and the connector . ''
The container chassis is characterized by this.

  As a stopper device for regulating the positions of both ends on which the front frame slides, as described in claim 2, two main beams extending parallel to the front-rear direction of the main frame are connected in the lateral direction, and the front device A plurality of cross members formed with spaces through which the part frame passes are provided, and a stopper plate protruding laterally is fixed to the front frame so that the stopper plate abuts the cross member. The position of the front frame can be restricted.

According to a third aspect of the present invention, a positioning device for positioning the rear frame is provided between the rear frame and the main frame at both end positions where the rear frame slides and intermediate positions thereof. It is preferable.

  The container chassis of the present invention is divided into a main frame at the center, a front frame, and a rear frame, and the front frame and the rear frame are slidable with respect to the main frame, and the total length of the container chassis. Is elastic. When the front and rear portions of the container chassis are extended, a long container of, for example, 45 feet can be loaded. When the front frame and the rear frame are accommodated in the main frame and shortened, for example, when a 20-foot container is loaded, the load of the container can be properly distributed to the wheels of the tractor and the loading and unloading of the cargo can be performed. In some cases, the rear end of the container can be brought closer to the platform. Thus, since the container chassis of this invention can load various containers, what is called an empty state reduces and an operation rate improves.

In the container chassis of the present invention, stopper devices are installed at both end positions where the front frame slides with respect to the main frame, and the entire front frame is positioned only at two positions at both ends.
The heavy front frame cannot be slid manually, and it is necessary to connect the tractor to travel at a low speed and to move with its power. In the container chassis of the present invention, when the stopper device provided between the front frame and the main frame comes into contact when the tractor is moved forward or backward at a slow speed, a braking force is applied to the wheels of the container chassis. The tractor stops automatically. The stopped position is a position at which the front frame and the main frame can be fixed by the positioning device, which makes it very easy to position the sliding front frame.

The front frame of the container chassis of the present invention is provided with two bolsters on the front and rear sides to which the container fasteners are attached, and the bolster provided on the front side can be attached to the front end of the front frame. At the same time, it is configured such that it can be attached to the front frame portion and the tractor connector by moving it backward .
Since the bolster itself is not so heavy, it can be moved manually, and the operator can easily position the bolster provided on the front side at an accurate location. Therefore, even if the position of the front frame itself is limited to two positions, that is, the extended position and the shortened position, it is possible to load various containers by changing the mounting position of the front bolster of the front frame. It becomes possible. For example, when loading a 45-foot container, the position of the front bolster is set at the front end of the front frame, and when loading a 40-foot container, the bolster is moved backward. The rear bolster in the front frame is used when the front frame is shortened to load a 20 foot container.
Further, when the bolster provided on the front side is moved rearward, the bolster can be attached between the front end portion of the front frame and the coupling tool of the tractor. According to this structure, if the bolster arrange | positioned at the front side is positioned back and a container is fixed, the front part of the container will be located ahead rather than the coupling tool with a tractor. Therefore, the container load acts directly on the coupler, and a sufficient fifth wheel load can be distributed to the tractor wheels .

  According to the invention of claim 2, as a stopper device for regulating the positions of both ends on which the front frame slides, a stopper plate protruding laterally is fixed to the front frame, and this stopper plate is provided on the main frame. It is made to contact | abut to the some cross member in which the space part which a flame | frame passes was formed. If such a cross member is provided on the main frame, the rigidity of the sliding portion of the front frame increases, and smooth sliding becomes possible. Further, the stopper device has a simple structure, and the two positions of the extended position and the shortened position can be regulated by a single stopper plate.

According to a third aspect of the present invention, a positioning device for an intermediate position is provided so that the rear frame that can slide with respect to the main frame can be set not only at the sliding end positions but also at the intermediate position. In the present invention, the front frame can be set to only two positions of the extended position and the shortened position. However, when the rear frame is set to the intermediate position as in the invention of claim 3 , the intermediate length can be set. By setting the rear end of the container (for example, a 40-foot container) at the intermediate position, the loading position of the intermediate-length container can be freely set to adjust the fifth wheel load. Since the rear frame is much lighter than the front frame and can be slid finely by hand, the operation of positioning the rear frame at the intermediate position is an operation that can be easily performed.

  The present invention will be described below with reference to the drawings. FIG. 1 is a schematic view generally showing an embodiment of a container chassis of the present invention. The container chassis of this embodiment can be loaded with three types of containers having lengths of 45 feet, 40 feet and 20 feet. A state where the container is loaded is indicated by a broken line, and a state where a 20-foot container is loaded is indicated by a two-dot chain line.

  As shown in FIG. 1, the container chassis of the present invention includes a main frame 1 placed in the center, and a front frame 2 and a rear frame 3 placed in front and rear, respectively. Container chassis axles 4A, 4B, and 4C are attached to main frame 1 via a suspension mechanism, and although not shown, equipment necessary for traveling such as a wheel brake device is attached. Yes.

  The front frame 2 and the rear frame 3 are slidably attached to the main frame 1 so that the container chassis is configured such that its full length can be expanded and contracted. As is apparent from the front view, the front portion of the front frame 2 is a so-called gooseneck portion 21 having a high ground height to be connected to a tractor (not shown). The king pin 22 for the coupler is fixed. At the rear end portion of the gooseneck portion 21, an elevating leg portion 23 is attached to support the front portion of the container chassis when separated from the tractor.

  The front frame 2 and the rear frame 3 are provided with fasteners attached to both ends of a bolster extending in the lateral direction of the container chassis in order to fix a container to be loaded. In the container chassis of this embodiment, two bolsters B2F and B2R are arranged on the front frame 2, and the rear bolster B2R is integrally fixed to the front frame 2, whereas the front bolster B2R is fixed to the front frame 2. The bolster B <b> 2 </ b> F is a movable so-called slide bolster, and is configured to be attachable to two positions, that is, the position of the front end portion of the front frame 2 and the position between the front end portion and the king pin 22. On the other hand, one bolster B3 is fixed to the rear frame 3 at the rear end.

  At both ends of each bolster, a fastening tool for fixing the corner portion of the bottom of the container to be loaded is attached. In these fasteners, the fastener 5A attached to the foremost bolster B2F is a fastener called a thread pin, and the fasteners 5B to 5D attached to the other bolsters are fasteners called a twist lock. Yes. By the way, in the container chassis of this embodiment, the bolster B3 of the rear frame 3 is provided with two twist locks 5C and 5D at the front and rear, respectively, and when loading a 20-foot container, the front twist lock Use 5C. The twist lock 5C and the twist lock 5B on the rear side of the front frame 2 employ a twist lock that can be moved downward and stored so as not to protrude upward when a 40-foot or 45-foot container is loaded. The

Here, a method for expanding and contracting the frame corresponding to the length of the container in the container chassis of the present invention will be described.
In the container chassis of the present invention, the front frame 2 can be positioned only at two positions, ie, an extended position and a shortened position, which are both end positions that slide with respect to the main frame 1. Between the main frame 1 and the main frame 1, there are provided a stopper device and a positioning device for restricting both frames to this position. When the front frame 2 is slid, the front frame 2 is connected to the tractor by the king pin 22, and a brake is applied to the wheels of the main frame 1 to advance or reverse the tractor at a slow speed. When the front frame 2 reaches the extended position or the shortened position, the stopper device contacts and the tractor automatically stops. Thereby, even if the front frame 2 is heavy, positioning work becomes very easy. When loading 40-foot and 45-foot containers, the front frame 2 is set to the extended position and the 20-foot container is set to the shortened position.

  Thus, after setting the position of the front frame 2 itself, the operator manually sets the position of the bolster B2F on the front side of the front frame 2 and also sets the position of the rear frame 3 manually. The front bolster B2F and the rear frame 3 are much lighter than the front frame 2 and can be fully slid manually, and accurate positioning is easy with manual operation. Specifically, when loading a 45-foot container, the front bolster B2F is positioned at the front end of the front frame 2, and the rear frame 3 is positioned at the rearmost position where the rear frame 3 can slide. When loading a 40-foot container, the front bolster B2F is positioned at the middle between the front end of the front frame 2 and the king pin 22, and the rear frame 3 is positioned at the middle position of the slide. When the 20-foot container is loaded, the front frame 2 is set to the shortened position and the rear frame 3 is positioned to the forefront (at this time, the bolster B2F is placed between the front end and the king pin 22 as a tractor. In order to avoid interference).

  When the container chassis is expanded and contracted as described above according to the three types of containers and fixed with the corresponding fasteners, the containers are loaded in the manner shown in FIG. According to this loading method, when a 20-foot container is loaded, the front frame 2 can be shortened to distribute the appropriate fifth wheel load to the tractor, and at the same time, the rear end of the container approaches the platform. Can be made. When a 40-foot container is loaded, the position of the center of gravity (center position) of the container is almost the same as when a 45-foot container is loaded, so that an excessive fifth wheel load can be avoided.

  Next, the slide mechanism, stopper device, and the like of the front frame 2 will be described with reference to FIGS. 2A shows the state of the main frame 1 and the front frame 2 when the front frame 2 is placed in the extended position, and FIG. 2B shows the front frame 2 in the shortened position. It shows the state when placed. In FIG.2 (c), the superimposition part of the main frame 1 and the front frame 2 is expanded and shown. 3 (a), 3 (b), and 3 (c) show the AA arrow view, the BB arrow view, and the CC arrow view of FIG. 2 (c), respectively. A cross member, a stopper device, a guide roller, and a positioning device are illustrated.

  As shown in the plan views of FIGS. 2A and 2B, the main frame 1 includes two main beams 11 extending in parallel in the front-rear direction. The front frame 2 also includes two front main beams 24 that extend in parallel in the front-rear direction, and a cross member 25 (in FIG. 1, the cross of the front frame 2 is easy to understand) between them. The members are not shown). As can be seen from FIG. 3, these main beams are made of steel having an I-shaped cross section in which upper and lower flange plates are connected by a central web plate, and the dimensions of the front main beam 24 slide within the main frame 1. Therefore, it is smaller than the size of the main beam 11. As shown in FIG. 2C and the like, three cross members 12A, 12B, and 12C each having a space through which the front frame 2 passes are also installed on the front side portion of the main frame 1 (FIG. 3). (See also (a)). Between the main frame 1 and the front frame 2, a guide roller GR for smoothly sliding the front frame 2 and a positioning device PD for positioning the front frame 2 are provided.

  As shown in FIG. 3A (see also FIG. 2C), a stopper plate 26 is fixed to the web plate of the front main beam 24 by welding in the vicinity of the rear end portion of the front frame 2. The stopper plate 26 protrudes in the lateral direction from the flange plate of the front main beam 24 and is supported by a triangular reinforcing plate (see aa arrow view). When the front frame 2 is set to the shortened position in FIG. 2B, the stopper plate 26 comes into contact with the rear cross member 12C when the tractor connected to the front frame 2 is moved backward at a very low speed. At this position, the tractor stops and the position is regulated. 2A, when the tractor connected to the front frame 2 is moved forward, the tractor stops at the position where the stopper plate 26 abuts against the intermediate cross member 12B, and the position is set. Be regulated. That is, in this stopper device, the two positions of the shortened position and the extended position can be regulated by one stopper plate 26.

  A positioning device shown in FIG. 3C is installed on the main beam 11 of the main frame 1. This positioning device is for positioning the front frame 2 with respect to the main frame 1 by inserting a pin PP with a handle attached to the main beam 11 into a pin insertion hole PH of the front frame 2. The front frame 2 is provided with pin insertion holes PH at two positions facing the pin PP with the handle in the shortened position and the extended position restricted by the stopper device (specifically, the upper and lower flange plates are attached to the front frame 2). A pin insertion hole PH is provided in the plate-shaped bracket to be connected). When the front frame 2 is placed in the shortened position or the extended position, the operator operates the pin PP with the handle and inserts it into the pin insertion hole PH so that the front frame 2 is in a predetermined position with respect to the main frame 1. Fix it.

  Further, as shown in FIG. 3B, a guide roller GR that smoothly slides the front frame 2 is provided between the main frame 1 and the front frame 2. In this guide device, two guide rollers GR are brought into contact with the upper and lower flanges of the front main beam 24, and the guide roller GR is pressed against the front frame 2 by a spring attached to the main beam 11 of the main frame 1. It is. The detailed structure of such a guide device is described in Patent Document 1 according to the application of the present applicant, and when this guide device is employed, the front frame 2 that slides can be stably guided. However, the front frame 2 may be guided by a simple guide roller having a shaft fixed to the main beam.

  FIG. 4 shows the structure of a bolster (slide bolster) B <b> 2 </ b> F that is placed on the front side of the front frame 2 and whose mounting position can be changed. As shown in FIG. 4 (b), this bolster has a bolster body BB made of a hollow bar-like steel material extending in the lateral direction, and a thread pin 5A for fixing the container at both ends is fixed to the lower part of the bolster. At the same time, two positioning tools PD are fixed to the intermediate portion. This positioning tool PD also has a configuration similar to that of the positioning device having a pin with a handle shown in FIG. The front frame 2 is provided with a pin insertion hole for inserting a pin with a handle at the position of the front end portion and the position between the king pin 22 and when loading a 45-foot container, a slide bolster is provided. B2F is attached to the front end portion (upper view of FIG. 4A), and when loading a 40-foot container, it is attached to a position between the king pins 22 (lower view of FIG. 4A). The slide bolster B2F itself is lightweight, and the operation of changing the mounting position can be easily performed manually.

  Next, the slide mechanism and the like of the rear frame 3 will be described with reference to FIGS. FIG. 5A shows the state of the main frame 1 and the rear frame 3 when the rear frame 3 is placed at the extended position and the intermediate position (broken line), and FIG. It shows the state when placed in the shortened position. FIGS. 6A, 6B, and 6C show the AA arrow view, the BB arrow view, and the CC arrow view in the lower view of FIG. 5A, respectively. A member, a guide roller, and a positioning device are illustrated. Note that the slide mechanism and the like of the rear frame 3 are not changed in principle from those of the front frame 2, and here, differences will be mainly described.

  As shown in FIG. 5, the rear frame 3 includes two rear main beams 31 extending in parallel, and a cross member 32 (see FIG. 5B) is positioned between the two in the meantime, in FIGS. 1 and 5A. In order to facilitate understanding, a cross member of the rear frame 3 is omitted). As can be seen from FIG. 6, the front main beam 24 of the front frame 2 is a steel material having an I-shaped cross section, whereas the rear main beam 31 is a steel material having a U-shaped cross section. Further, the width between the two rear main beams 32 is narrower than the width between the front main beams 24. A cross member 12D formed with a space through which the rear frame 3 passes is installed at an appropriate position on the rear portion of the main frame 1 (see also FIG. 6A). Between the main frame 1 and the rear frame 3, as shown in FIGS. 6B and 6C, a guide roller GR and a positioning device PD similar to the slide mechanism of the front frame 2 are provided. However, three pin insertion holes of the positioning device PD are provided in the rear main beam 32 so that the rear frame 3 can be set at an intermediate position in addition to the extended position and the shortened position.

A bolster B3 equipped with a twist lock for fixing the rear end of the loaded container is fixed to the rear end of the rear frame 3. When loading a 45-foot container, the rear frame 3 is positioned at the extended position in FIG. 5A, and for a 40-foot container, the rear frame 3 is positioned at the intermediate position in FIG. The container is fixed using the twist lock 5D. When loading a short 20-foot container, the rear frame 3 is set to the shortened position in FIG. 5B and fixed by the twist lock 5C on the front side of the bolster B3. The twist lock may be omitted, and all containers may be fixed with a common twist lock.
The rear frame 3 is relatively lightweight, and the operator can perform such positioning work manually and accurately. A manual slide mechanism for the rear telescopic frame is also disclosed in Patent Document 1.

  As described above in detail, the present invention is a container chassis in which the front frame and the rear frame are slidably attached to the main frame, and stopper devices are installed at both end positions where the front frame slides with respect to the main frame. The front frame is positioned only at both end positions, and the bolster arranged at the front end of the front frame can be attached to different positions in the front-rear direction. In the above-described embodiment, the container chassis for loading three types of containers of 20 feet, 40 feet, and 45 feet has been described, but it goes without saying that the present invention can be applied to those loading containers of other sizes. Further, it is apparent that various modifications can be made to the embodiment, such as making the gooseneck portion of the front frame narrow as shown in FIG. 7 and increasing the number of attachment points of the guide roller.

It is a figure which shows the whole container chassis of this invention, and a container loading state. It is a figure which shows the relationship between the front part frame and main frame of this invention. It is a principal part cross-sectional arrow view of FIG. It is a figure which shows the bolster placed in the front side of the front part frame of this invention. It is a figure which shows the relationship between the rear part frame and main frame of this invention. It is a principal part cross-sectional arrow view of FIG. It is a figure which shows the conventional container chassis provided with the rear part slide frame. It is a figure which shows the conventional trailer provided with the front part slide frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main frame 11 Main beam 12A-12D Cross member 2 Front frame 21 Gooseneck part 22 Kingpin 24 Front main beam 26 Stopper plate 3 Rear frame 31 Rear main beam 5A-5D Fastener B2F Front bolster (front frame)
B2R rear bolster (front frame)
B3 Bolster at rear end (of rear frame)
PD positioning device GR guide roller

Claims (3)

A container chassis towed by a tractor and capable of loading containers of different lengths,
The container chassis includes a front frame provided with a coupling tool with a tractor, a main frame placed in the center, and a rear frame provided with a container bolster and extending a lateral bolster. Each of the part frame and the rear frame is configured to be stretchable by sliding with respect to the main frame, and
Between the front frame and the main frame, a stopper device is provided for restricting both end positions where the front frame slides, and a positioning device for positioning the front frame at the both end positions is provided,
The front frame is provided with two front and rear bolsters mounted with container fasteners and extending in the front-rear direction. The front-side bolster includes a front end portion of the front frame, a front end portion, and a tractor. A container chassis configured to be attachable to a position between the connection tool . The main frame includes two main beams extending in parallel in the front-rear direction, and a plurality of cross members that connect the two main beams in the lateral direction and have a space through which the front frame passes. And, a stopper plate protruding in the lateral direction is fixed to the front frame,
2. The container chassis according to claim 1, wherein the position of the front frame is regulated by the stopper plate coming into contact with the cross member at both end positions where the front frame slides. Wherein between the rear frame and the main frame, the both end positions and the intermediate position where the rear frame is slid, according to claim 1 or claim 2 positioning device is provided for positioning said rear frame Container chassis.

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