JP6556020B2 - vehicle - Google Patents

Description

  A loading platform is disposed on the traveling vehicle body, and the front horizontal plate of the loading platform can be engaged with and disengaged from the front plate and intersects the load loading surface. Is connected to and supported by the rear horizontal plate so as to be able to swing around the swing axis of the direction, the front horizontal plate extends along the extending direction of the rear horizontal plate, and the front horizontal plate is relative to the rear horizontal plate. The present invention relates to a vehicle configured to be able to change the longitudinal length of a cargo bed to a shortened posture bent so as to intersect.

  As described above, as a vehicle that can change the front and rear length of the loading platform by changing the posture of the front horizontal plate, the bracket fixed to the rear side of the front horizontal plate of the loading platform and the front surface of the rear horizontal plate A fulcrum pin is inserted over a frame fixed to the side, and a structure in which a front horizontal plate is supported in a swingable manner with respect to a rear horizontal plate around a vertical axis is known ( For example, see Patent Document 1).

JP 2009-179253 A (see paragraph “0047”, FIG. 8 and FIG. 9)

The vehicle having the above-described conventional structure is useful in that the front and rear lengths of the loading platform can be easily changed by changing the posture of the front horizontal plate.
In such a vehicle, the suspension spring on the rear wheel side is generally set to be strong so that the suspension spring on the rear wheel side can maintain a moderate cushioning action even when a heavy load is loaded on the loading platform. is there. For this reason, when the cargo bed is in an empty state, the load carrying surface is in a slightly lower front posture, and the axis of the vertical fulcrum pin that pivotally connects the front horizontal plate and the rear horizontal plate is slightly forward. It is tilted.
Therefore, for example, the posture of the loading platform in which the front horizontal plate is in the extended posture along the extending direction of the rear horizontal plate is changed to a shortened posture bent so that the front horizontal plate intersects the rear horizontal plate. Sometimes, the following problems may occur. That is, after the front horizontal plate on one side in the left-right direction of the cargo bed is bent so as to intersect the rear horizontal plate, the front horizontal plate on the other side is bent in the same way by turning around the rear side of the cargo bed. When trying to do so, the front side plate on the one side that has been bent first may be restored to its original extended posture by its own weight.
In order to prevent this, it is necessary to maintain the posture of the front horizontal plate, which has been bent first, with a detent weight, or to maintain the posture by an auxiliary worker. There is room for improvement in this regard.

  The present invention changes the posture of the front horizontal plate to change the longitudinal length of the loading platform, so that the posture of the front horizontal plate can be easily maintained, and the workability associated with the change of the loading platform length is improved. It is to improve.

The vehicle according to the present invention is characterized in that a cargo bed is disposed on a traveling vehicle body, and the cargo bed is in a direction intersecting the cargo loading surface on the front side of the bottom plate and a cargo loading surface. A front plate that is erected, a rear plate that is erected along a direction intersecting the load carrying surface on the rear side of the bottom plate, and the left and right lateral sides of the bottom plate. A pair of left and right horizontal plates erected along a direction intersecting the surface, and formed in a rectangular box shape that is open upward, and the horizontal plate is provided at a position closer to the front side of the loading platform. It is composed of a combination of a front horizontal plate and a rear horizontal plate provided on the rear side of the front horizontal plate, and the front horizontal plate is the front plate of the front horizontal plate and the rear horizontal plate. The rear support plate is connected to the rear lateral plate so that it can be engaged with and disengaged and can swing about a swing axis in a direction intersecting the load carrying surface. The loading platform has an extension posture in which the front horizontal plate extends along the extending direction of the rear horizontal plate and a shortened posture bent so that the front horizontal plate intersects the rear horizontal plate. The front and rear length of the front lateral plate is configured to be changeable, and the front lateral plate, which is released from the connection with the front plate, is restricted from swinging by its own weight at the connection portion between the front lateral plate and the rear lateral plate. Ri Oh provided swinging resistance mechanism of a light load sufficient to the front end portion of the rear lateral plate, Ru Oh provided limit stopper for restricting the swinging of a predetermined or more rear side of the front transverse plate In the point.

According to the present invention, a light load swing sufficient to regulate the swing of the front horizontal plate, which has been disconnected from the front plate, due to its own weight, at the connection location between the front horizontal plate and the rear horizontal plate. Since the resistance mechanism is provided, a light rocking resistance by the rocking resistance mechanism can be given to the rocking of the front horizontal plate.
As a result, even if the front horizontal plate on one side released from the connection with the front plate is swung to the shortened posture side, the posture of the front horizontal plate is maintained at the swung position. Therefore, it is avoided that the front horizontal plate on the one side swings to the extended posture side until the other side front horizontal plate is swung to the shortened posture side. This is advantageous in that it is easy to perform posture change operation of the front horizontal plate with good workability.

  In addition, since the limit stopper that restricts the swing of the front horizontal plate beyond the predetermined rear side is provided, it is easier to change the posture of the loading platform to the shortened posture with better workability. That is, if the restriction position to the rear side by the limit stopper is set to be the position at the time of the shortened posture of the front horizontal plate, the front horizontal plate on one side is swung to the restriction position, Maintaining that position, turning to the opposite side and swinging the front horizontal plate on the other side to the restricted position makes it easy to maintain the posture so that both front horizontal plates are in the shortened position. be able to. This makes it easier to perform the front / rear length changing operation of the loading platform by changing the posture of the front horizontal plate with better workability.

  In the present invention, the rear end portion of the front horizontal plate and the front end portion of the rear horizontal plate are connected to each other so as to be swingable about the swing axis by hinge connecting portions provided at respective opposing ends. It is preferable that the swing resistance mechanism is provided at the hinge connecting portion.

  By having this configuration, the swing resistance mechanism is incorporated into the hinge connecting portion using the hinge connecting portion that connects the rear end portion of the front horizontal plate and the front end portion of the rear horizontal plate. Thus, the swing resistance mechanism can be easily configured compactly.

  In the present invention, the hinge connecting portion includes a hinge protrusion provided on each of a rear end portion of the front horizontal plate and a front end portion of the rear horizontal plate, and a fulcrum penetrating each hinge protrusion. Provided with a pin, provided at a plurality of positions in the vertical direction, the uppermost position of the hinge connecting portion as the fulcrum pin on each of the rear end portion of the front horizontal plate and the front end portion of the rear horizontal plate A bolt nut for tightening the provided hinge projecting pieces in the tightening direction is provided, and a friction member whose frictional resistance is increased by elastic deformation as the bolt nut is tightened is provided as the swing resistance mechanism. It is preferable.

With this configuration, a bolt and nut is used as the fulcrum pin of the hinge connecting portion, and the swing resistance mechanism is structured by a friction member that can be elastically deformed to give a frictional resistance as the bolt and nut is tightened. It can be configured easily and compactly.
Moreover, since the bolt nut which can clamp | tighten a friction member is provided in the hinge connection part of the uppermost position among several hinge connection parts, it is advantageous also at the point which is easy to operate the bolt nut.

  In the present invention, it is preferable that the friction member is constituted by a disc spring interposed between the bolt nut and the hinge protrusion.

  With this configuration, it is possible to obtain a rocking resistance mechanism for the front horizontal plate using a disc spring used as a bolt loosening prevention structure, and a rocking resistance mechanism with a simpler structure and a more compact structure. Can be obtained.

1 is an overall side view of a vehicle with a two-row seat specification. 1 is an overall side view of a vehicle in a single row seat specification. 1 is an overall plan view of a vehicle in a double row seat specification. It is a side view which shows the attitude | position change form of a rear seat. It is a perspective view of the loading platform in the extended posture. It is a perspective view of a loading platform showing a posture change process from an extended posture to a shortened posture. It is a perspective view of the loading platform in a shortened posture. It is a disassembled perspective view of the hinge connection part in the connection location of a front horizontal plate and a rear horizontal plate. It is an up-down direction sectional view in alignment with the left-right direction of the hinge connection part in the connection location of a front horizontal board and a rear horizontal board. It is explanatory drawing which shows the back-and-forth length change point of a loading platform. It is sectional drawing which shows the rocking | fluctuation resistance mechanism in another embodiment. It is a top view which shows the rocking | fluctuation resistance mechanism in another embodiment.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
In the description of the present embodiment, the front-rear direction and the left-right direction are described as follows unless otherwise specified. That is, the forward traveling direction (see arrow F in FIG. 3) to which the driver seat of the vehicle to which the present invention is applied is “front”, and the forward traveling direction (see arrow B in FIG. 3) is “rear”. The direction corresponding to the right side (see arrow R in FIG. 3) with respect to the forward posture in the front-rear direction is “right”, and the direction corresponding to the left side (see arrow L in FIG. 3) is also “left”. .

〔overall structure〕
1 to 3 show an entire multipurpose vehicle as an example of a vehicle according to the present invention. FIG. 1 is an overall side view in a usage pattern in which seats that can be seated in two front and rear rows are present, and FIG. 2 is an overall side view in a usage pattern in which seats that can be seated only in one front row. FIG. 3 is an overall plan view of the usage pattern in FIG.

As shown in FIGS. 1 to 3, the vehicle includes a steerable left and right front wheels 2 and 2 supported on the front portion of the fuselage frame 1, and a steerable left and right support supported on the rear portion of the fuselage frame 1. A traveling vehicle body equipped with rear wheels 3 and 3 is provided.
A front cover 5 provided with a pair of left and right headlamps 4 is provided at the front end of the traveling vehicle body. A riding section 7 provided with a lops 6 is provided at a position behind the front cover 5 in the traveling vehicle body. A loading platform 8 capable of dumping operation is provided at the rear of the traveling vehicle body.

The boarding part 7 is provided in the front-rear intermediate part of the traveling vehicle body. In this riding section 7, a two-row seat specification in which an occupant can be seated in the front seat 16 and the rear seat 17 shown in FIG. 1, and a one-row seat specification in which an occupant can be seated in the front seat 16 shown in FIG. The usage pattern of the rear seat 17 can be changed. The specific structure of the usage pattern will be described later.
The loading platform 8 provided at the rear of the riding section 7 is configured to be able to change the state between an extended posture (corresponding to the front-side mounted state) and a shortened posture (corresponding to the rear-side mounted state), which will be described later. . A partition member 15 that partitions the boarding unit 7 and the loading platform 8 is disposed between the riding unit 7 and the loading platform 8.

The body frame 1 of the traveling vehicle body includes a pair of left and right main frames 11 that are long in the front-rear direction. The main frame 11 is formed such that the front frame portion 11A supported by the front wheels 2 and 2 is low and the rear frame portion 11B supported by the rear wheels 3 and 3 is high. A rising frame portion 11C that connects the rear end of the lower frame portion 11A and the front end of the rear frame portion 11B at a higher position is provided at an intermediate position, and these front frame portion 11A, rear frame portion 11B, It is formed in a stepped shape including a rising frame portion 11C.
Due to such a stepped shape, the engine 9 is disposed in a space formed below the rear frame portion 11B on the rear side of the rising frame portion 11C. The driving force output from the engine 9 is input to the traveling mission 10, and the shifted driving force is transmitted to the front wheels 2 and the rear wheels 3, so that a four-wheel drive type traveling vehicle body is configured.

The rising frame portion 11C of the main frame 11 is located near the front end of the rear seat 17 in the double row seat specification state, and is located near the front end of the loading platform 8 in the extended posture, and the front frame portion 11A and the rear frame portion 11B. The position in the front-rear direction is set.
Therefore, as shown in FIG. 1, when the riding section 7 has a two-row seat specification, the loading platform 8 is in a shortened posture, and a seat portion 17 </ b> A (corresponding to a seating seat) of the rear seat 17 is included in the main frame 11. It is located in a state where it is mounted on the rear frame portion 11B at a location higher on the rear side than the rising frame portion 11C.
As shown in FIG. 2, when the riding section 7 has a single-row seat specification, the loading platform 8 is in the extended posture, and the rear frame of the main frame 11 that is higher than the rising frame portion 11C. The extension part of the loading platform 8 is mounted on the part 11B, and the seat part 17A of the rear seat 17 is folded forward.

The body frame 1 has a front portion supported by left and right front wheels 2 and 2 and a rear portion supported by left and right rear wheels 3 and 3. The body frame 1 is supported by left and right front wheels 2 and 2 and left and right rear wheels 3 and 3 via a suspension mechanism (not shown).
This suspension mechanism is a suspension on the rear wheels 3 and 3 side so that the shock absorbing function is not impaired even when a heavy object is mounted on the loading platform 8 installed at the rear part on the body frame 1. The mechanism is configured with a strong spring force.
For this reason, the load carrier 8 installed on the machine body frame 1 is in a state where nothing is mounted on the load carrier 8 or when the load is light, the load loading surface 8A of the load carrier 8 is in a horizontal plane. On the other hand, the surface is inclined slightly downward.

[Boarding part]
The boarding part 7 is demonstrated.
The riding section 7 is provided with a lops 6. The lops 6 are disposed in the front portion of the riding section 7 and have a front riding section 13 (corresponding to “driving section for driving”) having a front riding section space 13a, and a rear riding section having a rear riding section space 14a. 14.

  The lops 6 are a pair of left and right frames disposed on the laterally outer sides of the vehicle body at the front end portion of the front riding space 13a and the upper frame 60 positioned in the longitudinal direction of the vehicle above the front riding space 13a and the rear riding space 14a And a pair of left and right rear columns 62, 62 arranged in the laterally outer side of the vehicle body between the front riding part 13 and the rear riding part 14. ing. Further, the upper frame 60 projects rearward from the rear support 62 at the same height level as the rear support 62.

In the front riding section 13, front seats 16 and 16 are provided on both the left and right sides in the front riding section space 13a, so that two-seaters can be used.
A steering wheel 12 is provided in front of the front seat 16 in the left region among the left and right front seats 16 and 16, and the front riding section 13 is configured as a riding section for driving. The left and right front seats 16, 16 are configured to be slidable back and forth separately by guide rails (not shown).

  The rear riding part 14 is provided with a rear seat 17. The rear seat 17 is configured as a horizontally long seat that can be seated by two people, and the rear riding section 14 is capable of two people. The rear seat 17 is configured to be switchable between a use state indicated by a two-dot chain line in FIG. 4 and a storage state indicated by a solid line in FIG. Specifically, the rear seat 17 is configured as follows.

The rear seat 17 includes a horizontally long seat portion 17A (corresponding to a seating seat portion) and a horizontally long backrest portion 17B.
The seat portion 17A includes a cushion layer portion 18 serving as a resilient seating surface, a seat mounting frame 19 that supports the cushion layer portion 18, and an attachment for connecting the seat mounting frame 19 to the main frame 11. A metal fitting 20 is provided.

The mounting bracket 20 is pivotally connected to the support bracket 21 fixed to the rising frame portion 11C of the main frame 11 so as to swing up and down around the horizontal axis x1 in the left-right direction.
Therefore, when the seat mounting frame 19 connected to the mounting bracket 20 on the front end side rotates about the horizontal axis x1, the posture of the seat portion 17A of the rear seat 17 is switched between the use state and the retracted state. The

  The backrest portion 17 </ b> B is connected to the upper end portions of the pair of left and right link members 23, 23 that are arranged on both sides of the rear seat 17. The lower ends of the pair of left and right link members 23, 23 are rotatably supported by a mounting portion 22 integral with the rear frame portion 11B below the seat portion 17A. The upper ends of the pair of left and right link members 23 are connected to a connecting member 24 provided on the back side of the backrest portion 17B so as to be relatively rotated.

The pair of left and right link members 23, 23 are arranged so as to be inclined downwardly from the rear toward the front when the backrest portion 17B is in the use posture, and function as armrest portions.
The lower end side of the partition member 15 is connected to a connecting member 24 provided on the back side of the backrest portion 17B. The partition member 15 includes a partition frame that is manufactured by connecting a frame body that faces the vehicle body and a frame body that vertically faces the vehicle body, and a net-like member that is stretched around the partition frame.

  Of the left and right main frames 11, the left and right rising frame portions 11C and the rear frame portions 11B cover the driving space where the engine 9 is disposed in the range extending between the rising frame portion 11C and the rear frame portion 11B. A cover body 25 for heat insulation is provided.

  As shown in FIGS. 3 and 4, the rear seat 17 includes a retractor 26 a located on both the left and right sides, a seat belt 26 b wound around each retractor 26 a, and the left and right directions of the rear seat 17. The seat belt device 26 is provided with a pair of belt end fixing tools 26c capable of fixing the end portions of the respective seat belts 26b drawn from the left and right retractors 26a. Although not described, the front seat 16 is also provided with a seat belt device 26.

(Loading platform)
The loading platform 8 will be described.
As shown in FIGS. 1 and 2, the loading platform 8 is supported on the vehicle body so as to swing up and down via a dump fulcrum shaft 27 that is disposed on the rear end side and that faces the vehicle body. The loading platform 8 includes a loading posture that is positioned horizontally or substantially horizontally on the vehicle body, and a dumping posture in which the front end side is raised upward from the vehicle body by the lifting cylinder 28 that is mounted across the lower surface side of the loading platform 8 and the body frame 1. It is configured to be capable of swinging up and down.

  As shown in FIG. 5 to FIG. 7, the loading platform 8 has a bottom plate 30 having a cargo loading surface 8A and a front side of the bottom plate 30 that is erected along a direction intersecting the cargo loading surface 8A. On the rear side of the plate 31 and the bottom plate 30, the rear plate 32 erected along the direction (vertical direction) intersecting with the load carrying surface 8 </ b> A, and on the left and right sides of the bottom plate 30 And a pair of left and right horizontal plates 33 erected along a direction (vertical direction) that intersects the loading surface 8A, and is formed in a rectangular box shape that is open upward.

The lateral plates 33 located on both the left and right sides of the cargo loading surface 8A are a front lateral plate 34 provided near the front side of the loading platform 8 and a rear lateral plate 35 provided on the rear side of the front lateral plate 34. It consists of a combination.
As shown in FIG. 5 to FIG. 7 and FIG. 10, the rear horizontal plate 35 is fixed to a position closer to the rear side of the bottom plate 30 together with the rear plate 32, and the rear end of the front horizontal plate 34 is the load loading surface 8A. Is connected to and supported by the front end portion of the rear horizontal plate 35 so as to be swingable about a swing axis y1 in a direction (vertical direction) intersecting with respect to the vertical direction.
The front end portion of the front horizontal plate 34 is configured to be detachable with respect to the front plate 31 via a connection operation tool 36. The front horizontal plate 34 is configured to be swingable.

The front plate 31 is connected at the position of the front end portion of the bottom plate 30 so as to swing up and down around the horizontal axis x3 in the left-right direction. The bottom plate 30 is configured by a combination of a front bottom plate 30F that is a front portion of the load carrying surface 8A and a rear bottom plate 30R that is a rear portion of the load carrying surface 8A. The front bottom plate 30F is connected to the front end edge side of the rear bottom plate 30R so that the front bottom plate 30F swings around the horizontal axis x2 in the left-right direction along the front end edge of the rear bottom plate 30R.
Accordingly, as shown in FIGS. 7 and 10, the front plate 31 is folded around the horizontal axis x3 toward the front bottom plate 30F, and the front bottom plate 30F is around the horizontal axis x2 with respect to the rear bottom plate 30R. The posture of the loading platform 8 can be switched to a standing state.

  In this way, the front plate 31 and the front bottom plate 30F are switched to the standing posture, and the front horizontal plate 34 is swung around the swing axis y1 so as to be in a state along the front edge of the rear bottom plate 30R. As a result, the longitudinal length of the loading platform 8 becomes shorter than before the front bottom plate 30F is erected, and the load loading surface 8A has a shortened posture that exists only on the upper side of the rear bottom plate 30R.

The operation of switching the longitudinal length of the loading platform 8 is performed according to the procedure shown in FIG.
The loading platform 8 shown in STEP 1 of FIG. 10 is in an extended posture in which the length in the front-rear direction of the cargo loading surface 8A is maximized. The loading platform 8 shown in STEP 4 in FIG. 10 is in a shortened posture in which the length in the front-rear direction of the cargo loading surface 8A is minimized.

  As shown in STEP 2 of FIG. 10, the left and right front horizontal plates 34 are swung toward the inside of the loading platform so as to be folded along the front edge of the rear bottom plate 30 </ b> R. The left and right front horizontal plates 34 are swung at a position where the front horizontal plate 34 is perpendicular or substantially perpendicular to the rear horizontal plate 35, and a limit stopper 37 (see FIG. 5) provided on the rear horizontal plate 35. (See FIG. 7), the swinging to the rear side is restricted.

  Next, as shown in STEP 3 of FIG. 10, the front plate 31 is tilted and swung toward the upper surface side of the front bottom plate 30F to be in a folded posture overlapping the upper surface of the front bottom plate 30F.

  Next, as shown in STEP 4 in FIG. 10, the front bottom plate 30 </ b> F is erected and swung toward the front horizontal plate 34 in the folding posture, so that the folding position overlaps the outer surface of the front horizontal plate 34. In this case, the loading platform 8 can be switched to the shortened posture.

  In this shortened posture of the loading platform 8, since the left and right front horizontal plates 34 are in a folded state positioned on the inner side of the loading platform than the front bottom plate 30F, the left and right front horizontal plates 34 are more than the front bottom plate 30F. Compared to adopting a folded state located on the outside of the loading platform, the longitudinal length of the loading platform 8 in the shortened posture can be shortened by the thickness of the front horizontal plate 34.

  In this embodiment, as shown in FIG. 10, the loading platform 8 includes left and right locking mechanisms 38 that fix the front bottom plate 30F and the left and right rear horizontal plates 35 in the folded state. In addition, a regulating member 39 is provided on each upper end side of the left and right front horizontal plates 34. The restriction member 39 restricts the front plate 31 from rotating upward about the axis x3. That is, when the front plate 31 attempts to rotate upward about the axis x3, the posture of the front plate 31 is maintained by the restriction member 39 coming into contact with the front plate 31. With this configuration, if the lock mechanism 38 is provided between the front bottom plate 30F and the left and right rear horizontal plates 35, a simple configuration can be achieved without providing a complicated lock mechanism for maintaining the posture of the front plate 31. Thus, the posture of the front plate 31 can be maintained.

  As shown in FIGS. 1 and 3, when the loading platform 8 is switched to the shortened posture, the front-rear length is shortened, and the front end side is located behind the rear riding space 14 a, so that the vehicle is in a two-row seat specification. Can be.

In order to switch the loading platform 8 to the extended posture, the operation is performed in the reverse procedure to the case of switching to the shortened posture described above.
That is, as shown in STEP 3 of FIG. 10, the front bottom plate 30 </ b> F is tilted forward so as to be in an extended posture aligned with or substantially flush with the rear bottom plate 30 </ b> R. Next, as shown in STEP 2 of FIG. 10, the front plate 31 is erected and swung to a stretched posture rising from the front end portion of the front bottom plate 30 </ b> F. Next, as shown in STEP 1 of FIG. 10, the left and right front horizontal plates 34 are swung toward the outside of the loading platform and switched to an extended posture that is flush with or substantially flush with the rear horizontal plate 35. Thus, the entire loading platform 8 can be switched to the extended posture in which the longitudinal length is extended.

  As shown in FIG. 2, when the loading platform 8 is switched to the extended posture, the front end side enters the rear riding section space 14a due to the extension of the front-rear length. At this time, the rear seat 17 is switched to the retracted state, and the partition member 15 is moved to the front partition position for the one-row seat specification, so that the front end side of the loading platform 8 can enter the rear riding section space 14a. To do. The front end side of the loading platform 8 enters the vacant seat portion (the portion where the used rear seat 17 was present) in the rear riding space 14a by switching the rear seat 17 to the retracted state.

[Oscillation resistance mechanism]
At the connection portion between the front horizontal plate 34 and the rear horizontal plate 35, the front portion of the front horizontal plate 34, which has been released from the connection with the front plate 31, can be restricted from swinging due to its own weight. A rocking resistance mechanism 50 capable of applying a light load as resistance against the rocking of the horizontal plate 34 is provided.
As shown in FIGS. 8 and 9, the rocking resistance mechanism 50 is provided in the hinge connecting portion 40 provided at the opposite end portion between the rear end portion of the front horizontal plate 34 and the front end portion of the rear horizontal plate 35. ing.

  The hinge connecting portion 40 includes hinge protrusions 41 and 43 provided at the rear end portion of the front horizontal plate 34, hinge protrusion pieces 42 and 44 provided at the front end portion of the rear horizontal plate 35, and hinges for the respective hinges. And fulcrum pins 45, 46 penetrating through the pivot holes 41a, 42a, 43a, 44a formed in the projecting pieces 41, 42, 43, 44. The hinge protrusions 41, 42, 43, 44 and the fulcrum pins 45, 46 are distributed in two places in the vertical direction, the upper end and the lower end of the front horizontal plate 34 and the rear horizontal plate 35. Is provided. The upper and lower fulcrum pins 45 and 46 are arranged on a common axis line which is the swing axis y1 of the front horizontal plate 34.

Of the fulcrum pins 45 and 46, the fulcrum pin 45 provided on the uppermost hinge connecting portion 40 includes a head 45a, a screw shaft portion 45b, and a locking nut 45c screwed to the screw shaft portion 45b. It is composed of bolts and nuts. Since this bolt nut is provided in a state in which the head 45a serving as the operation portion is exposed above the hinge connecting portion 40, the bolt nut is in a position where an operation for adjusting the tightening degree of the bolt nut can be easily performed.
The fulcrum pin 46 provided in the lower hinge connecting portion 40 is constituted by a headed pin, and the shaft portion 46a is pivoted in the hinge protrusions 43, 44 formed in the lower hinge connecting portion 40. It is configured to be inserted through 44a and to be fixed with a locking pin 46b (see FIG. 9) such as a β pin that protrudes below the pivotal support holes 43a, 44a.

The swing resistance mechanism 50 is constituted by a disc spring 51 interposed between the hinge protrusion 42 in the uppermost hinge connecting portion 40 and the head 45 a of the fulcrum pin 45.
That is, by tightening the bolt and nut constituting the fulcrum pin 45, the disc spring 51 interposed between the hinge protrusion 42 and the head 45a of the fulcrum pin 45 is compressed and deformed, and the front side Light resistance is given to the rotation of the plate 34 around the swing axis y1. By giving the turning resistance by the disc spring 51, the posture changing operation of the front horizontal plate 34 can be performed with good workability.

  That is, when the loading platform 8 is in an empty state, the rear side of the body frame 1 tends to be lifted from the front side by the action of a suspension spring (not shown) on the rear wheel 3 side. 8, the rear side of the bottom plate 30 is also in a front-falling inclined posture in which the rear side is raised from the front side. Along with this, the swing axis y1 of the front horizontal plate 34 is also in a forward leaning posture in which the upper side inclines slightly toward the front side in an empty state. Therefore, when the loading platform 8 in the extended posture is to be switched to the shortened posture, the front horizontal plate 34 that rotates about the swing axis y1 in the forward tilted posture is extended by the weight of the front horizontal plate 34 due to its own weight. There is a tendency for the return action force to the posture side to work.

However, in the present invention, since the rotation resistance by the swing resistance mechanism 50 is given to the front horizontal plate 34, it is easy to avoid such problems.
That is, when the loading platform 8 in the extended posture is to be switched to the shortened posture, the left front horizontal plate 34 is once swung clockwise around the rocking axis y1 as indicated by a virtual line in FIG. After operating and switching to a shortened posture intersecting with the rear horizontal plate 35, the right front horizontal plate 34 is swung counterclockwise around the swing axis y1 by turning the rear side of the loading platform 8. . At this time, as shown by the solid line in the figure, even if the left front horizontal plate 34 is bent first, the left front horizontal plate 34 may return to its own weight due to its own weight. This is because when the loading platform 8 is empty, the swing axis y1 is tilted forward, and the left front horizontal plate 34 swings counterclockwise around the swing axis y1 by its own weight. This is due to the fact that the return force in the direction of movement is working. Since the turning resistance by the rocking resistance mechanism 50 effectively acts on the return acting force, the occurrence of a situation in which the left front horizontal plate 34 returns to the extended posture side without permission is avoided. Easy to do.

  A reference numeral 52 shown in FIGS. 8 and 9 is a collar member made of vibration-proof rubber or the like for reducing the occurrence of rattling in the hinge connecting portion 40. When the spring 51 is tightened, the collar member 52 also serves to give a certain degree of rotational resistance to the front horizontal plate 34.

As shown in FIGS. 5 to 7, on the inward surface side near the front end of the rear horizontal plate 35, the front horizontal plate 34 is positioned at a right angle or a substantially right angle with respect to the rear horizontal plate 35. A limit stopper 37 that restricts the swinging of the front horizontal plate 34 toward the rear side is provided.
The front horizontal plate 34 whose rearward movement is restricted by the limit stopper 37 is located along the front edge of the rear bottom plate 30R, and faces the front bottom plate 30F raised as shown in FIG. It becomes a state.
5 to 7 show the structure in which the limit stopper 37 is provided only on the inward surface near the front end of the right rear horizontal plate 35, the inner side near the front end of the left rear horizontal plate 35 is shown. The limit stopper 37 having the same specification is also provided on the facing surface at the same position as the right side.
5 to 7 illustrate a structure in which the connection operation tool 36 is provided on the front plate 31 only on the inward surface near the front end portion of the right front horizontal plate 34. Also on the inward surface near the front end of the left front horizontal plate 34, a connection operating tool 36 having the same specifications is provided at the same position as the right side.

[Other Embodiment 1]
In the above-described embodiment, the rocking resistance mechanism 50 is configured by the disc spring 51, but is not limited thereto.
For example, although not shown, instead of the disc spring 51, a coil spring or a friction plate capable of changing the volume elasticity to some extent may be used.
Other configurations may be the same as those in the above-described embodiment.

[Second embodiment]
In the above-described embodiment, the swing resistance mechanism 50 is exemplified by a structure that imparts frictional resistance such as the disc spring 51, but is not limited thereto.
For example, as shown in FIG. 11 and FIG. 12, in the hinge connecting portion 40, either the hinge protruding piece 41 on the front horizontal plate 34 side or the hinge protruding piece 42 on the rear horizontal plate 35 side. In addition, the engagement holes 53 are provided at four positions that are phased by 90 degrees in the circumferential direction of the fulcrum pin 45, and on the other side, a sheet metal projection member 54 that can be engaged with the two engagement holes 53 is provided. One protruding member 54 may be configured to selectively engage with two of the four engagement holes 53.
With such a configuration, the rocking resistance with respect to the front horizontal plate 34 increases at the position where the engagement hole 53 and the protruding member 54 are engaged, and the rocking force with respect to the front horizontal plate 34 is at the position where the engagement is released. Since the dynamic resistance is lower than that in the engaged state, the front lateral plate 34 can be operated to swing, and functions as a swing resistance mechanism 50 that can suppress swing due to its own weight.
Other configurations may be the same as those in the above-described embodiment.

[3 of another embodiment]
In the embodiment described above, the structure in which the rocking resistance mechanism 50 is provided in the uppermost hinge connecting portion 40 is exemplified, but the present invention is not limited to this.
For example, the swing resistance mechanism 50 may be provided in the hinge connection part 40 below the uppermost hinge connection part 40.
In addition, the hinge connecting portion 40 is not limited to the upper and lower portions, but may have a structure that is vertically long at one location, or may be provided at three or more locations.
Other configurations may be the same as those in the above-described embodiment.

[4 of another embodiment]
In the embodiment described above, the structure in which the swing resistance mechanism 50 is provided in the hinge connecting portion 40 is illustrated, but the present invention is not limited to this.
For example, an appropriate structure can be employed, such as connecting a friction member continuously to the lower part of the front horizontal plate 34 at a location deviated from the hinge connecting portion 40.
Other configurations may be the same as those in the above-described embodiment.

  The present invention can be applied not only to the transport vehicle but also to various vehicles provided with the loading platform 8.

DESCRIPTION OF SYMBOLS 1 Airframe frame 8 Loading platform 8A Cargo loading surface 30 Bottom plate 31 Front plate 32 Rear plate 33 Horizontal plate 34 Front side plate 35 Rear side plate 37 Limit stopper 40 Hinge connection part 41, 42, 43, 44 Hinge protrusion 45, 46 Support pin 50 Oscillation resistance mechanism 51 Disc spring

Claims (4)

A loading platform is arranged on the traveling vehicle body ,
The loading platform has a bottom plate with a load carrying surface;
A front plate erected on the front side of the bottom plate along a direction intersecting the load carrying surface;
A rear plate erected along the direction intersecting the load carrying surface on the rear side of the bottom plate;
A pair of left and right horizontal plates erected along the direction intersecting the load carrying surface on both the left and right sides of the bottom plate, and is formed in a rectangular box shape that is open upward.
The horizontal plate is composed of a combination of a front horizontal plate provided near the front side of the loading platform and a rear horizontal plate provided on the rear side of the front horizontal plate,
Of the front horizontal plate and the rear horizontal plate, the front horizontal plate can be engaged with and disengaged from the front plate and swings about a swing axis in a direction intersecting the load carrying surface. Movably connected to the rear lateral plate,
The front and rear lengths of the loading platform are changed to an extended posture in which the front horizontal plate extends along the extending direction of the rear horizontal plate and a shortened posture in which the front horizontal plate is bent so as to intersect the rear horizontal plate. Configured and possible
A light load swing resistance mechanism that is sufficient to restrict the front horizontal plate, which is released from the connection with the front plate, from being swung by its own weight at the connection portion between the front horizontal plate and the rear horizontal plate. the Ri Oh provided,
Said rear to the front end of the horizontal plate, said front transverse plate of the vehicle Ru Oh provided limit stopper for restricting the swinging of a predetermined or more rear side.   A rear end portion of the front horizontal plate and a front end portion of the rear horizontal plate are connected to each other so as to be swingable about the swing axis by hinge connecting portions provided at respective opposed end portions. The vehicle according to claim 1, wherein the rocking resistance mechanism is provided. The hinge connecting portion includes a hinge protruding piece provided at each of a rear end portion of the front horizontal plate and a front end portion of the rear horizontal plate, and a fulcrum pin penetrating each hinge protruding piece. Provided at multiple locations in the vertical direction,
The hinge connecting portion at the uppermost position, as the fulcrum pin, is a bolt that tightens the hinge projecting pieces provided at the rear end portion of the front horizontal plate and the front end portion of the rear horizontal plate in the tightening direction. 3. The vehicle according to claim 2, further comprising: a friction member that includes a nut and has a frictional resistance that is elastically deformed as the bolt and nut is tightened as the swing resistance mechanism.   The vehicle according to claim 3, wherein the friction member is configured by a disc spring interposed between the bolt nut and the hinge protrusion.

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