JP2013043527A - Rear gate structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear gate structure at a low cost by which operation for switching a rear gate in an opening position to a closed position, to lock it in the closed position is more easily performed than before.SOLUTION: A lock mechanism for keeping the rear gate 24 supported at a rear end of a loading platform at a closed position includes: a pair of right and left rods 38R supported to freely move in a vehicle width direction of the rear gate 24; an energizing means for energizing the pair of rods 38R to a lock position projected to a side direction; an engaging part 27B provided on a side panel 23 in order to catch both end parts of the rod 38R from a back side; and a lock release means which pulls out the pair of rods 38R from the engaging part 27B against the energizing means. On the basis of movement to the closed position of the rear gate 24, a tilting guide face 31A which moves and slides both end parts to either upward or downward is provided on the side panel 23.

Description

  The present invention relates to a rear gate structure in which a rear gate is pivotally supported at a rear end of a vehicle loading platform having a floor panel and a pair of side panels so as to be swingable and openable. In particular, the present invention relates to a lock mechanism that holds the rear gate in a closed position. .

  As prior art document information related to this type of rear gate structure, there is Patent Document 1 shown below. The rear gate structure described in Patent Document 1 includes a pair of left and right rods supported so as to be movable in the vehicle width direction of the rear gate, a spring that biases these rods to an outward lock position, and a lock position. A recess provided in the side panel so as to capture the tip of a certain rod, and a handle (lock releasing means) for manually operating the rod to an inward unlocking position are provided.

US Pat. No. 5,678,872 (FIGS. 7 and 9)

  However, in the rear gate structure described in Patent Document 1, when the rear gate in the open position is switched to the closed position and locked in the closed position, first, a pair of left and right rods are held by a handle (unlocking means). While holding the unlocked position, the rear gate is closed, and then the operation of releasing the handle holding the rod in the unlocked position while holding the rear gate in the closed position is interrupted. The rear gate lock operation was relatively complicated.

  Therefore, in view of the problem given by the conventional rear gate structure illustrated above, the object of the present invention is to switch the rear gate in the open position to the closed position and to perform the operation of locking in the closed position more easily. The purpose is to provide the rear gate structure at a lower cost.

The characteristic configuration of the rear gate structure according to the present invention is as follows:
A rear gate structure in which a rear gate is pivotally supported at a rear end of a vehicle loading platform having a floor panel and a pair of side panels so as to be swingable and openable;
A locking mechanism for holding the rear gate in a closed position;
A pair of left and right rods supported movably in the vehicle width direction of the rear gate;
An urging means for urging the pair of rods to a lock position protruding laterally from the vicinity of the left and right ends of the rear gate;
An engaging portion provided on the side panel to capture at least the rear end portions of the pair of rods in the locked position;
Unlocking means for manually retracting the pair of rods from the engaging portion against the biasing force of the biasing means;
An inclined guide surface is provided on the side panel for sliding the upper and lower ends of the pair of rods at the locked position up and down based on the movement of the rear gate to the closed position. Is that it is captured by the engaging portion when it gets over the inclined guide surface.

In the rear gate structure having the above-described characteristic configuration, when the rear gate is locked in the closed position, the both ends of the pair of rods are inclined guide surfaces of the side panel by simply swinging the rear gate to the closed position. When the vehicle is slid up or down, and is moved over the inclined guide surface, it is captured by the engaging portion, and the lock at the closed position is automatically completed, so there is no need to operate the unlocking means at all. Further, when the rear gate is swung to the closed position, the pair of rods do not move in the axial direction thereof, so that the unlocking means does not move in conjunction with each other.
In this way, the rear gate structure that can easily perform the operation of switching the rear gate in the open position to the closed position and locking in the closed position is like a striker that is generally used for passenger car doors and the like. Provided without using heavy and expensive parts. When switching to the open posture, the lock release means may be operated as in the conventional configuration.

In another characteristic configuration of the present invention, the engaging portion is formed to communicate with an opening formed in a rear end surface of the side panel.
The inclined guide surface is formed by bending a part of the plate material constituting the rear end surface toward the inside of the opening.

  With this configuration, the inclined guide surface is formed by bending a part of the plate material constituting the rear end surface of the side panel toward the inside of the opening, so the number of parts for realizing the rear gate structure The cost of manufacturing the rear gate structure can be reduced.

  According to another characteristic configuration of the present invention, an auxiliary urging force that urges both end portions of the pair of rods over the inclined guiding surface upward or downward toward the engaging portion positioned in front of the inclined guiding surface. Means is provided.

  In this configuration, the both end portions of the rod over the inclined guide surface are reliably moved to the engaging portion by the auxiliary biasing means in accordance with the operation of swinging the rear gate to the closed position. The operation of locking the gate in the closed position is performed more smoothly.

  Another feature of the present invention lies in that a spring for urging the vicinity of both end portions in either the upper or lower direction is provided as the auxiliary urging means.

  With this configuration, it is only necessary to attach a spring such as a compression spring between the both end portions of the rod and the upper or lower edge of the rear gate, so that the auxiliary biasing means can be easily realized.

It is a side view showing a working vehicle. It is a top view which shows a working vehicle. It is a rear view which shows a working vehicle. It is a perspective view which shows the body frame of a working vehicle. It is a disassembled perspective view which shows the loading platform of a working vehicle. It is a perspective view which shows the rear part end member of a side panel. It is a disassembled perspective view which shows a rear part end member. It is a partially broken perspective view which shows a floor panel, a side panel, and a rear gate. It is a rear view which shows the locking mechanism of a rear gate. It is a rear view which shows the lock arm vicinity. It is a side view which shows the lock arm vicinity. It is a side view which shows the effect | action of a locking mechanism. It is a side view which shows the effect | action of a suspending mechanism. It is another side view which shows the effect | action of a suspending mechanism. It is a rear view which shows the effect | action of the holding member of a suspending mechanism. It is a side view which shows a motion of a holding member. It is a side view which shows the gate hanger of a suspending mechanism. It is a side view which shows the dump cylinder vicinity of a loading platform (lowering position). It is a side view which shows the dump cylinder vicinity of a loading platform (rise position). It is the side view and top view which show a stopper body. It is a rear view which shows a loading platform, a piston member, and a stopper body. It is a side view which shows the front-end part vicinity of a loading platform. It is a disassembled perspective view which shows the front-end part of a loading platform. It is a partially broken rear view which shows another embodiment of a suspending mechanism.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings.
The external appearance of the work vehicle according to the present invention is shown in FIGS. This working vehicle includes a traveling machine body A supported by a pair of left and right front wheels 1 and a pair of left and right rear wheels 2 that can be steered, and a front guard 3 and a bonnet 4 are run at the front of the traveling machine body A. A cabin B constituting the operation unit 5 is provided at the center of the machine body A, a cargo bed 6 is provided at the rear of the traveling machine body A, and a drive unit C including the engine E is provided at a position below the cargo bed 6.

  The driving unit 5 is provided with a steering handle 7 and a seat 8 for steering the front wheel 1. A windshield 9 is provided at the front portion of the cabin B, a passenger door 10 is provided at the right and left sides of the cabin B, and a roof 12 is attached above the cabin B.

  This work vehicle is configured as a four-wheel drive type having a traveling drive system that transmits the driving force from the drive unit C to the front wheels 1 and the rear wheels 2, and can be used for multi-purpose work such as farm work and transport work. ing. The loading platform 6 is supported so as to be swingable about a lateral axis X <b> 1 disposed near the rear end of the traveling machine body A, and the front end side of the loading platform 6 is lifted and lowered by the operation of the hydraulic dump cylinder 13.

  The traveling body A includes a body frame F as a strength member. As shown in FIG. 4, the fuselage frame F includes a pair of left and right main frames 14 extending in the front-rear direction, a cabin frame unit 15 that supports the cabin B at a front position of the main frame 14, and a front end of the main frame 14. A front frame unit 16 connected to the upper frame 17, an upper frame 17 extending in the front-rear direction of the traveling machine body A so as to be parallel to the main frame 14 at a position above the rear position of the main frame 14, and a rear position of the main frame 14. And a frame unit 18 for supporting the drive unit C. The left and right main frames 14 and the upper frame 17 are connected by a connecting frame 19 in a vertical orientation, and the lateral axis X1 of the loading platform 6 is provided near the rear end of the upper frame 17.

(Schematic structure of loading platform)
As shown in FIG. 5, the loading platform 6 includes a floor panel 21, a front panel 22, left and right side panels 23, and a rear gate 24 that can be freely opened and closed. The front panel 22 and the left and right side panels 23 are connected to the floor panel 21, and the rear gate 24 is swingably supported around a lateral axis X <b> 2 disposed near the rear end of the floor panel 21. More specifically, a pair of plate-like brackets 25 are attached near the left and right rear ends of the floor panel 21 (see also FIG. 8), and the rear gate 24 is provided at the rear end of the plate-like bracket 25. It is pivotally supported by the horizontal axis X2 formed. A housing-like rear end member 27 extending in the vertical direction is fixed to the rear ends of the left and right side panels 23 by welding.

As shown in FIG. 6, the rear end member 27 includes an outer end body 28 and an inner end body 29 which are fixed to each other by welding.
As shown in FIGS. 6 and 7, the outer end body 28 includes a main plate portion 28A extending in the front-rear direction of the traveling machine body A, a square pipe portion 28B disposed at the front end of the main plate portion 28A, and a main plate portion. And a rear end plate portion 28C formed by bending the rear end of 28A inward. The square pipe portion 28B is formed by continuously bending the front end of the main plate portion 28A inward, has a generally square cross-sectional shape in plan view, and has a hollow shape inside.
The rear end member 27 is welded and fixed to the rear end surface of the side panel 23 via the front end surface of the square pipe portion 28B.

The inner end body 29 includes a main plate portion 29A extending in the front-rear direction of the traveling machine body A, and an upper end plate portion 29B extending outward from the upper end of the main plate portion 29A.
In the outer end body 28 and the inner end body 29, the upper end plate portion 29 </ b> B of the inner end body 29 abuts on the inner surface of the upper end of the main plate portion 28 </ b> A of the outer end body 28 and the front end of the main plate portion 29 </ b> A of the inner end body 29. The surface is welded and fixed in such a manner that the surface comes into contact with the square pipe portion 28B of the main plate portion 28A. Thereby, the space located between the rear end plate portion 28C of the main plate portion 28A and the square pipe portion 28B is closed by the inner end body 29, and a generally rectangular parallelepiped housing is formed in the space.

  Two rectangular cutout portions 30A and 30B are formed in the rear end plate portion 28C of the outer end body 28 in a state of being spaced apart from each other in the vertical direction. From the upper end of the rectangular end face forming portion 31 left between the two notches 30A and 30B, a guide piece 31P inclined forward extends integrally.

Two cutout portions 32A and 32B are also formed on the main plate portion 29A of the inner end body 29 in a state of being spaced apart vertically. From the rear of the lower end of the upper notch 32A, a tongue-shaped restricting piece 33 having a rounded tip is formed obliquely projecting forward and upward. The rear end surface of the restricting piece 33 can support the guide piece 31P from the front.
Further, from the inner surface of the main plate portion 29A of the inner end body 29, a pivot pin 34 for pivotally supporting a gate hanger 40 to be described later is erected outward.

  As shown in FIG. 6, the notch 30A above the outer end body 28 and the notch 32A above the inner end body 29 cooperate with each other to receive the vicinity of the other ends of rods 38L and 38R described later. An opening 27A is formed. Further, the lowermost end portion of the cutout portion 32A, that is, the front portion of the base end portion of the restriction piece 33 constitutes an engaging portion 27B that captures at least the vicinity of the other end of the rods 38L and 38R from the rear. The engaging portion 27B is formed in communication with the opening 27A.

  When the rear gate 24 is in the closed position, the end bodies 24SL and 24SR provided so as to extend vertically on the left and right ends of the rear gate 24 overlap the rear end member 27 of the side panel 23 and the end bodies 24SL and 24SR. The catch portion 24U that extends downward from the upper end outside of the rear end member 27 wraps the upper end of the rear end member 27 from the side.

(Configuration of lock mechanism)
A lock mechanism is provided between the rear gate 24 and the side panel 23 to hold the rear gate 24 in a closed posture in which the vicinity of the rear ends of the left and right side panels 23 is closed. As shown in FIG. 9, the lock mechanism includes a pair of left and right L-shaped lock arms 35 that are provided in the vicinity of the center of the left and right sides of the rear surface of the rear gate 24 so as to be swingable about a longitudinal axis 35A. The arm 35 includes a pair of left and right rods 38L and 38R that are pivotally supported at one end at the outer free end of the arm 35 and the other end extends outward in the vehicle width direction. The inner free ends of the lock arm 35 are pivotally supported around the axis 35B via a pin inserted through a long hole formed in the inner free end. Further, as shown in FIGS. 10 and 11, the lock mechanism includes a spring 36 (an example of an urging unit) that urges the outer free ends of the lock arm 35 in a direction in which they are separated from each other. Thus, the lock release handle 37 (an example of the lock release handle means) for manually bringing the outer free ends of the lock arm 35 close to each other against the urging force of the spring 36 is provided. The lock release handle 37 is pivotally supported around the horizontal axis. When the swing release operation is performed so that the lower end of the lock release handle 37 is pulled up, each inner free end of the lock arm 35 is pushed down together with the shaft center 35B. The outer free ends of the arms 35 are operated close to each other, and the rods 38L and 38R are pulled toward the left and right central sides. In FIG. 10, the lock release handle 37 is omitted.

Further, as shown in FIG. 9, the vicinity of the other end of the rods 38L and 38R is attached downward between a position slightly closer to the center than the other ends of the rods 38L and 38R and the main body of the rear gate 24. A pair of coil springs 39 (an example of auxiliary urging means) for energizing is provided. The upper end of the coil spring 39 is locked in a through hole formed in the vicinity of the other end of the rods 38L and 38R, and the lower end of the coil spring 39 is locked in a through hole formed in the panel forming the rear surface of the rear gate 24. Has been.
As shown in FIG. 9B, in the state where the rods 38L and 38R are pulled toward the left and right central sides by the lock release handle 37, the coil spring 39 is in an inclined posture with the upper end moved inward, so that the rods 38L and 38R. It acts to urge the left and right outside. Therefore, similarly to the spring 36, the coil spring 39 also functions to bias the free ends of the lock arm 35 in a direction in which they are separated from each other.

FIG. 9A shows that the other ends of the pair of left and right rods 38L and 38R protruding and urged outward from the left and right end surfaces of the rear gate 24 in the closed position enter the opening 27A of the rear end member 27 described above. And the locked state captured from the rear by the engaging portion 27B is shown.
That is, when no external force is applied to the lock arm 35 via the lock release handle 37, the other ends of the pair of left and right rods 38L and 38R are urged outwardly from the left and right end surfaces of the rear gate 24 by the spring 36 or the like. ing.

  Therefore, as shown in FIG. 12A, when the rear gate 24 is swung from the open position toward the closed position, the other ends of the rods 38L and 38R protruding left and right from the rear gate 24 enter the opening 27A. Then, the rods 38L and 38R start to come into contact with the guide pieces 31P of the left and right side panels 23, and the other ends of the rods 38L and 38R are opposed to the biasing force of the coil spring 39 by the inclined rear surface 31A of the guide pieces 31P (an example of an inclined guide surface). Is moved to. When the upper end of the rear surface 31A is finally climbed, as shown in FIG. 12 (b), it is stored in the engaging portion 27B located in front of and below the regulating piece 33 by the urging force of the coil spring 39, and is captured at the same location. Thus, the rear gate 24 is locked.

Next, as shown in FIG. 9B, when the unlocking handle 37 is pulled up against the urging force of the spring 36 or the like while the rear gate 24 is locked in the closed position, A swinging operation is performed to bring the free ends close to each other, and the other ends of the rods 38L and 38R come out from the opening 27A and are released from being captured by the engaging portion 27B. Therefore, the rear gate 24 is opened. can do.
As illustrated in FIG. 5, the components of the lock mechanism excluding the lock release handle 37 are covered with a cover member 24 </ b> C that constitutes a rear cover of the rear gate 24.

(Configuration of suspension mechanism)
When the rear gate 24 after the unlocking is gradually opened downward from the closed posture of FIG. 13A, the rear gate 24 is composed of the left and right side panels 23 and the rear gate 24 as shown in FIG. 13B. The rear gate 24 is automatically opened by about 90 ° from the closed position by the suspending mechanism provided therebetween, and is held in an intermediate posture in which the inner surface of the rear gate 24 is substantially horizontal.
The suspension mechanism includes a pair of left and right elongated gate hangers 40 pivotally supported by pivot pins 34 of the left and right side panels 23, and a pair of left and right shaft members that project laterally outward from the rear gate 24. 42.

The gate hanger 40 is pivotally supported by the pivot pin 34 through a long hole 40A formed on the upper end side thereof.
On the other hand, a through hole 40B is formed on the lower end side of the gate hanger 40, and the shaft member 42 of the rear gate 24 can be manually engaged with and disengaged from the through hole 40B.
FIG. 14 shows a state where the lower end side of the gate hanger 40 is manually removed from the shaft member 42.

  As shown in FIG. 14, the through-hole 40B includes a lower first hole 40B1 and an upper second hole 40B2 that are in communication with each other via a narrow portion 40B3. The upper second hole portion 40B2 has a sufficiently larger inner diameter than the lower first hole portion 40B1, and the shortest distance between the projecting portions facing each other to form the narrow portion 40B3 is greater than that of the first hole portion 40B1. Is set too small.

  As shown in FIG. 15, the shaft member 42 is formed of a solid cylindrical body, and is extended adjacently to the proximal end portion 42A fixed to the side surfaces of the left and right side panels 23 and the distal end side of the proximal end portion 42A. The detaching shaft portion 42B, the locking shaft portion 42C extending adjacent to the distal end side of the detaching shaft portion 42B, and the circle extending adjacently to the distal end side of the locking shaft portion 42C A plate-like retaining head 42D.

  The locking shaft portion 42C has an outer diameter that is larger than the width of the narrow portion 40B3 and smaller than the inner diameter of the first hole portion 40B1. The detaching shaft portion 42B has an outer diameter smaller than the width of the narrow portion 40B3. The base end portion 42A and the retaining head 42D have an outer diameter larger than the inner diameter of the first hole 40B1. Particularly, the retaining head 42D has an outer diameter smaller than the inner diameter of the second hole 40B2.

  Normally, as shown in FIG. 15, the gate hanger 40 is pivotally supported in a state in which the first hole 40 </ b> B <b> 1 is engaged with the locking shaft portion 42 </ b> C of the shaft member 42 in an outer fitting manner. Therefore, as described above, when the rear gate 24 is gradually opened downward, when the pivot pins 34 of the left and right side panels 23 come into contact with the upper ends of the long holes 40A of the gate hanger 40, the rear gate 24 The opening of the rear gate 24 is restricted, and as shown in FIG. 13B, the inner surface of the rear gate 24 is held in an intermediate position where it is substantially horizontal.

  Here, by moving the vicinity of the lower end of the gate hanger 40 inward, the first hole portion 40B1 is made to coincide with the shaft portion 42B for detachment of the shaft member 42, and the rear gate 24 is slightly returned to the closed position as it is. The detaching shaft portion 42B passes through the narrow portion 40B3 and enters the second hole portion 40B2. Therefore, when the vicinity of the lower end of the gate hanger 40 is moved outward, the second hole 40B2 is released outward from the retaining head 42D, so that the gate hanger 40 is released from the shaft member 42. As a result, the rear gate 24 can be opened downward from the horizontal posture.

(Configuration of holding member)
Further, as shown in FIGS. 13B, 14 and 15, the suspension mechanism prevents the gate hanger 40 from inadvertently moving from the locking shaft portion 42C to the detaching shaft portion 42B. The plate-shaped holding member 44 is provided. The holding member 44 is obtained by bending a plate material so that the cross section is generally U-shaped, and is pivotally supported on the side surface of the rear gate 24. As shown in FIG. 14, a pair of leg portions 44A facing each other. , 44B and a connecting portion 44C for connecting the leg portions 44A, 44B.
The holding member 44 is fixed to the side surface of the rear gate 24 by a bolt 44H through a through hole formed in the inner leg portion 44A, but can be manually swung.

  As shown in FIG. 15 and indicated by a solid line in FIG. 13 (b), the holding member 44 is attached to the detachable shaft portion 42B of the shaft member 42 through a notch 44V formed in the outer 44B. As shown by a two-dot chain line in FIG. 13B, the swing operation can be performed between the lock position engaged in the fitting shape and the lock release position that has come out of the position of the detachment shaft portion 42B. . In the locked position, the connecting portion 44C of the holding member 44 is parallel to the inner surface of the rear gate 24 and substantially flush with the inner surface, or parallel to the inner surface and slightly retracted from the inner surface.

  As shown in FIG. 15, the holding member 44 is pressed against the shaft member 42 in a normal state in which the first hole 40 </ b> B <b> 1 of the gate hanger 40 is externally disposed in the locking shaft portion 42 </ b> C of the shaft member 42. In this way, the notch 44V of the holding member 44 is engaged with the detaching shaft portion 42B, and the holding member 44 is sandwiched between the side surface of the rear gate 24 and the gate hanger 40. The situation where the gate hanger 40 is carelessly moved to the detaching shaft portion 42B is prevented.

On the side surface of the rear gate 24, a disk-like stopper 24 </ b> B that projects the angle of the holding member 44 at the unlocked position with respect to the rear gate 24 to a predetermined angle of less than 90 ° (for example, 45 °) is projected. .
As shown in FIG. 17, a vertically extending guide plate 29C extends in the vehicle width direction from the longitudinal side of the notch 32B of the inner end body 29 constituting the rear end member 27 (see FIG. 17). 6, see also FIG.

  As shown in FIG. 16A, when the rear gate 24 is swung from the open position to the closed position even when the holding member 44 is in the unlocked position where it abuts against the stopper 24B, the holding member 44 is operated. As shown in FIG. 16 (b), the holding member 44 is forcedly moved by the tip portion of the guide plate 29C automatically starting to contact the guide plate portion 29C and being moved downward by the guide plate portion 29C. To the locked position.

  As shown in FIG. 17, a retaining head 34A is provided at the tip of the pivot pin 34 so that the pivot pin 34 is not inadvertently detached from the long hole 40A of the gate hanger 40. For the purpose of enabling the gate hanger 40 to be attached to the pivot pin 34 after the assembly of the rear gate 24 is completed, the retaining head 34A has an oval shape and is formed on the gate hanger 40. A widened portion 40Ax that exceeds the major axis of the retaining head 34A is formed in a part of the long hole 40A. The gate hanger 40 is attached to the pivot pin 34 by using a notch 30B formed in the rear end member 27.

(Configuration of stopper body)
As shown in FIG. 18, the dump cylinder 13 that moves up and down the front side of the loading platform 6 has a cylinder member 13A pivotally supported on the body frame F side, and is a piston member that is supported to be extendable and contractable with respect to the cylinder member 13A. The tip of 13B is pivotally supported on the lower surface of the loading platform 6.
As shown in FIG. 21, in the piston member 13B, a connecting cylinder 13C fixed to the tip of the piston member 13B is interposed between a pair of brackets 6A formed on the lower surface of the loading platform 6, and the bracket 6A The pin member 6P is inserted into each through-hole and the connecting cylinder 13C in the horizontal orientation at the same time, so that it is pivotally supported on the lower surface of the loading platform 6.

  A pressure hose (not shown) extending from a hydraulic pump (not shown) driven by the engine E is connected to the cylinder member 13A as an oil passage for extending and contracting the piston member 13B. The supply / discharge of oil to / from the cylinder chamber is controlled by a dump control valve (not shown) interposed between the hydraulic pump and the cylinder chamber. Here, the lower end of the cylinder member 13A is pivotally supported by a support bracket 20 extending inward from the vicinity of the rear end of the right main frame 14 (see also FIG. 4).

A stopper body 50 is provided on the lower surface of the loading platform 6 to prevent the loading platform 6 disposed at the raised position by the dump cylinder 13 from descending.
As shown in FIG. 20, the stopper body 50 has a long stopper body 51 made of a channel material and a pair of left and right brackets 52 attached near the upper end of the stopper body 51.

The bracket 52 includes a base end portion 52A that is welded and fixed to the side surface of the stopper main body 51, and a supported portion 52B that extends upward from the base end portion 52A. In the left and right supported parts 52B, elongated holes 52H extending along the longitudinal direction of the stopper main body 51 are formed.
As shown in FIG. 21, in the stopper body 50, the pair of brackets 52 sandwich the pair of brackets 6A of the loading platform 6 from the left and right outsides, and the pin member 6P is connected to the connecting cylinder 13C of the piston member 13B and the loading platform 6. In a form that is inserted through the pair of brackets 6A and the pair of brackets 52 (long holes 52H) of the stopper body 50 at the same time, the brackets 6A are swingably supported around the lateral axis.

  As shown in FIG. 18, in the stopper body 50, the channel material constituting the stopper body 51 is positioned above the piston member 13B, and at least a part of the piston member 13B is made of the channel material according to the extension of the piston member 13B. It arrange | positions in the state which can be made to enter the recessed part of a cross section. The bracket 52 is provided near the upper end surface 51A of the stopper main body 51. The stopper main body 51 is swingably supported in a state where the pin member 6P is inserted through the long hole 52H.

As shown in FIG. 18, when the stopper body 50 is not used as a means for preventing the platform 6 from being lowered, the stopper body 50 is basically provided by a locking mechanism provided between the stopper body 50 and the lower surface of the platform 6. The lower end surface 51 </ b> B side of the stopper main body 51 is held at a retracted position close to the lower surface of the loading platform 6.
The locking mechanism includes a locking hook 55 attached to the lower surface of the loading platform 6 and a through hole 51H formed in the vicinity of the lower end surface 51B of the stopper main body 51. The locking hook 55 includes a base end portion 55A extending downward from the lower surface of the loading platform 6, an arm portion 55B extending forward from the lower end of the base end portion 55A, and an upward extending from the front end of the arm portion 55B. And a hook portion 55C that has been taken out.

  When the stopper body 50 is moved to the retracted position, the vicinity of the lower end surface 51B of the stopper main body 51 is lifted and brought closer to the lower surface of the loading platform 6, and the lower end surface 51B is removed from the hook portion 55C by utilizing the allowance for the long hole 52H. The stopper body 50 is once moved forward until it is disposed forward, and then the hook portion is inserted into the through hole 51H while the lower end side of the stopper body 51 is inserted rearward from the gap between the lower surface of the loading platform 6 and the hook portion 55C. What is necessary is just to insert 55C.

When the stopper body 50 is used as means for preventing the platform 6 from being lowered, the stopper body 50 is moved rearward while slightly lifting the lower end side of the stopper body 51 while the platform 6 is raised to the maximum angle by the dump cylinder 13. When it is moved, the lower end side of the stopper main body 51 is removed from the locking hook 55, and a swing operation is possible around the pin member 6P.
Accordingly, as shown in FIG. 19, the stopper body 51 is configured while the lower end side of the stopper body 51 is pulled down and the position of the stopper body 50 is adjusted along the piston member 13B by utilizing the flexibility based on the long hole 52H. When the channel member to be moved is close to the piston member 13B until it encloses the piston member 13B, the lower end surface 51B of the stopper body 51 is in contact with the outer peripheral surface of the piston member 13B and is opposed to the upper end surface of the cylinder member 13A. It becomes.

  When the loading platform 6 is lowered from this state, the U-shaped upper end surface 51A of the stopper main body 51 receives the outer peripheral surface of the connecting cylinder 13C of the piston member 13B, and the U-shaped lower end surface 51B of the stopper main body 51 is the cylinder. In the state where the upper end surface of the member 13A (the end surface of the cylinder member 13A facing the coupling cylinder 13C) is received, the lowering of the cargo bed 6 is realized.

  Since the pin member 6P is separated from both ends of the long hole 52H of the bracket 52 while the stopper body 50 is used as a means for preventing the descent of the loading platform 6 in this way, the load on the loading platform 6 is reduced by the stopper body 50. The bracket 52 is not involved in supporting the load of the loading platform 6.

(Configuration near the front edge of the loading platform)
As shown in FIGS. 5, 22, and 23, a square pipe-shaped front end member 26 extending in the vertical direction is welded and fixed to the front ends of the left and right side panels 23 of the loading platform 6. As shown in FIG. 23 (b), each front end member 26 is formed by bending a single steel plate, and has the same shape as the square pipe portion 26A having a generally square cross section in plan view. And a flat plate-like extension portion 26 </ b> B extending inward from the front end of the portion constituting the inner side of the square.

The front end member 26 is welded and fixed to the front end of the side panel 23 via the rear end face of the square pipe portion 26A.
Further, the front end member 26 is configured such that the extension portion 26B of the front end member 26 is superimposed on the front component plate portion 22A of the front panel 22 from the front through the front end portion of the extension portion 26B. It is fixed by welding.

  A drainage channel 60 is formed at the lower end of the front component plate portion 22 </ b> A of the front panel 22 to drain rainwater or the like that has accumulated on the floor panel 21 of the loading platform 6. The lower end of the front constituting plate portion 22A extends sufficiently below the lower surface of the floor panel 21, and extends upward from the rear end of the first horizontal portion 22B and the first horizontal portion 22B extending rearward from the lower end. The first vertical portion 22C extends and the second horizontal portion 22D extends rearward from the upper end of the first vertical portion 22C.

  As shown in FIG. 22, the second horizontal portion 22D is welded and fixed to the lower surface of the floor panel 21, and the first horizontal portion 22B constituting the bottom portion and the front surface constituting the side wall portion facing each other in the front-rear direction. A drainage channel 60 is formed by the vicinity of the lower end of the component plate portion 22A and the first vertical portion 22C. Rainwater or the like that has accumulated on the floor panel 21 of the loading platform 6 flows into the first horizontal portion 22 </ b> B through the front and rear grooves formed in the floor panel 21, and is drained from the drainage channel 60 to the outside of the side.

[Another embodiment]
<1> The form of the auxiliary biasing means for biasing the vicinity of the other end of the rods 38L and 38R downward is not limited to the pair of coil springs 39, and various means can be applied.
For example, the rods 38L and 38R may be stored in the engaging portion 27B located in front of and below the regulating piece 33 by being dropped by the weight of the other end of the rods 38L and 38R and captured in the same place. Good.
Alternatively, a guide member that regulates the position of each of the left and right intermediate portions of the rods 38L and 38R with respect to the vertical direction is attached to the rear surface of the rear gate 24, and in the final stage of switching the swing of the rear gate 24 to the closed posture, While the rods 38L and 38R are elastically bent and deformed in the region outside the guide member, the other ends of the rods 38L and 38R are moved upward by the rear surface 31A (an example of an inclined guide surface), and the upper end of the rear surface 31A. May be carried out in the form of being accommodated in the engaging portion 27B with the restoring force in the same region of the rods 38L and 38R.

<2> The direction of the inclination of the rear surface 31A is opposite to that of the above-described embodiment, and the other end of the rods 38L and 38R is moved downward by the rear surface 31A when switching the swinging of the rear gate 24 to the closed posture. If the lower end of 31A is overcome, the rods 38L and 38R may be stored in the engaging portion 27B with the restoring force in the same region.

<3> In the hanging mechanism shown in FIG. 24, the shape of the lower end portion of the gate hanger 40 is the same as that described above, but the shaft member 142 erected on the left and right sides of the left and right sides of the rear gate 24 A fixed outer diameter is provided along the axial center except for the retaining portion 142D.
In addition to the gate hanger 40, a pair of washers 144A and 144B having an outer diameter that is larger than the inner diameter of the first hole 40B1 and smaller than the inner diameter of the second hole 40B2 are fitted on the shaft member 142. An annular collar member 143 having an outer diameter larger than the narrow portion 40B3 and smaller than the inner diameter of the first hole portion 40B1 is attached to the inner surface of the outer washer 144A.

Further, a compression spring 146 is fitted on the shaft member 142 between the inner washer 144B and the rear gate 24, and biases the vicinity of the lower end of the gate hanger 40 outward.
In a normal state in which the outer washer 144A is pressed against the retaining portion 142D by the urging force of the compression spring 146, the collar member 143 is inserted through the first hole 40B1, so that the shaft member 142 and the collar member 143 are narrow. It cannot move to 2nd hole 40B2 through part 40B3.
As the retaining portion 142D, a retaining pin having a length exceeding the inner diameter of the first hole 40B1 may be used.

  When the lower end portion of the gate hanger 40 is removed from the shaft member 142, the collar member 143 is moved from the first hole 40B1 while the vicinity of the lower end portion of the gate hanger 40 is moved inward against the urging force of the compression spring 46. When it is moved outward and the rear gate 24 is returned to the closed position as it is, the shaft member 142 passes through the narrow portion 40B3 and enters the large-diameter second hole portion 40B2. Therefore, when the vicinity of the lower end of the gate hanger 40 is moved to the outside, the second hole 40B2 is pulled outward from the retaining portion 142D, so that the gate hanger 40 is released from the shaft member 142.

  A rear gate is pivotally supported at the rear end of a vehicle loading platform having a floor panel and a pair of side panels so as to be swingable and openable, and a rear gate structure such as a work vehicle having a lock mechanism for holding the rear gate in a closed position is improved. It is an invention that can be used as a technique for the above.

X2 Horizontal axis (rear gate)
6 Loading platform (vehicle loading platform)
21 Floor panel 22 Front panel 23 Side panel 24 Rear gate 27 End member 27A Opening portion 27B Engaging portion (locking mechanism)
31 End face forming member (part of plate material)
31A Rear surface (lock mechanism, inclined guide surface)
31P Guide piece (lock mechanism)
33 Restriction piece (locking mechanism)
35 Lock arm (lock mechanism)
36 Spring (biasing means)
37 Unlocking handle (locking mechanism, unlocking means)
38L Rod (Lock mechanism)
38R Rod (Lock mechanism)
39 Coil spring (lock mechanism, auxiliary biasing means, spring)
40 Gate hanger (suspending mechanism, link member)

Claims (4)

A rear gate structure in which a rear gate is pivotally supported at a rear end of a vehicle loading platform having a floor panel and a pair of side panels so as to be swingable and openable;
A locking mechanism for holding the rear gate in a closed position;
A pair of left and right rods supported movably in the vehicle width direction of the rear gate;
An urging means for urging the pair of rods to a lock position protruding laterally from the vicinity of the left and right ends of the rear gate;
An engaging portion provided on the side panel to capture at least the rear end portions of the pair of rods in the locked position;
Unlocking means for manually retracting the pair of rods from the engaging portion against the biasing force of the biasing means;
An inclined guide surface is provided on the side panel for sliding the upper and lower ends of the pair of rods at the locked position up and down based on the movement of the rear gate to the closed position. Is a rear gate structure that is captured by the engaging portion when it gets over the inclined guide surface. The engaging portion is formed to communicate with an opening formed in a rear end surface of the side panel,
The rear gate structure according to claim 1, wherein the inclined guide surface is formed by bending a part of a plate material constituting the rear end surface toward the inside of the opening.   The auxiliary urging means for urging the both end portions of the pair of rods over the inclined guide surface upward or downward toward the engaging portion positioned in front of the inclined guide surface is provided. Or a rear gate structure according to 2;   4. The rear gate structure according to claim 3, wherein a spring for urging the vicinity of both end portions in either of the vertical directions is provided as the auxiliary urging means.

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