JP5816341B2 - Tipper truck rear door - Google Patents

Description

  The present invention relates to a rear door attached to an openable / closable gate frame attached to the back of a dump truck bed.

The structure described in Patent Document 1 is known as a structure on the back side of the dump truck platform. An outline of the structure described in Patent Document 1 is shown in FIGS.
FIG. 6 is a partial rear perspective view of the loading platform 2 of the dump truck 10. The loading platform 2 of the dump truck 10 is provided with a left wing 2B and a right wing 2C standing upright from both edges of the floor 2A ("left" and "right" in this specification refer to the case viewed from the front). A gate frame 3 is attached to the back surface of the loading platform 2. A rear door portion 60 is disposed on the back side of the gate frame 3.

  The gate frame 3 extends along the rear end of the left vertical frame 3B1 and the right side 2C extending along the rear end of the left tilt 2B at both ends of the horizontal frame 3A extending along the rear end of the floor 2A. It is a U-shaped frame formed by connecting existing right vertical frames 3C1.

  Further, the gate frame 3 includes pivot arms 3B2 and 3C2 that pivotably connect the upper ends of the vertical frames 3B1 and 3C1 to the vicinity of the rear ends of the upper surfaces of the lifts 2B and 2C. The swivel arms 3B2, 3C2 can swivel about the swivel axes 3B3, 3C3, respectively. The pivot shafts 3B3 and 3C3 are supported by the pivot bearing portions 3B4 and 3C4, respectively. The swivel bearing portions 3B4 and 3C4 are fixed to the upper surfaces of the left and right tilts 2B and 2C, respectively.

  The rear door portion 60 includes a rectangular plate-shaped rear door 60 </ b> A attached to the back side of the gate frame 3. One end of each of the link members 40B2 and 40C2 is connected to each open / close shaft formed near the lower end of the left and right side surfaces of the rear door 60A. Each link member 40B2, 40C2 is inserted into the vertical frame from the slit on the back surface of each vertical frame 3B1, 3C1, and the other end of each link member 40B2, 40C2 is a cylinder 40B1, 40C1 accommodated in the vertical frame. Is connected to the end of the rod. The cylinders 40B1 and 40C1 are hydraulic cylinders whose rods extend and contract when a valve of a hydraulic device (not shown) is operated from the driver's seat.

  In order to lock the rear door 60A in the closed state, lock portions 60B and 60C are provided in the vicinity of the left and right upper ends of the rear surface of the rear door 60A.

  FIG. 7A is a left side view showing the opening / closing operation of the gate frame 3 shown in FIG. Since the structure on the back side of the dump truck bed is bilaterally symmetric, the same applies to the right side surface (the same applies to FIG. 7B).

  In the closed state of FIG. 6, the gate frame 3 is engaged by a gate lock pin 7 </ b> A provided at the rear end of the loading platform 2 and a gate hook 7 </ b> B provided on the front surface of the lateral frame 3 </ b> A of the gate frame 3. Locked. The gate lock pin 7A and the gate hook 7B are locked and released by operating a valve of a pneumatic device (not shown) from the driver's seat. When the loading platform is tilted as shown in the state with the gate lock pin 7A and the gate hook 7B released, the gate frame 3 pivots around the pivot shaft 3B3 at the upper end of the loading platform 2 to open. That is, the lower end of the gate frame 3 is separated from the lower end of the loading platform 2.

  The opening / closing operation of the gate frame 3 is performed integrally with the closed rear door 60A. The rear door 60A is closed by passing a rear door support pin 60B2 attached to the back surface of the vertical frame 3B1 through a lock hole B3 formed in the rear door 60A, and attaching a rear door lock cap 60B1 to the head of the rear door support pin 60B2. It is locked with.

FIG. 7B is a left side view showing the opening / closing operation of the rear door 60A shown in FIG.
The opening / closing operation of the rear door 60A is performed when the gate frame 3 is closed. First, the rear door lock cap 60B1 is removed and attached to the storage pin 60B4 attached to the back surface of the vertical frame 3B1 for storage. As a result, the lock on the rear door 60A is released. Next, by controlling a hydraulic device (not shown) so as to shorten the rod of the cylinder 40B1, the opening / closing shaft rotates via the link member 40B2, and the rear door 60A is opened until it is horizontal.

  In this way, the rear surface of the dump truck loading platform has two systems, a state where the lower side opens with the upper end of the loading platform as an axis (FIG. 7A) and a state where the upper side opens with the lower end of the loading platform as an axis (FIG. 7B). Yes. Although the open state of FIG. 7A is a general one, the size of the opening is limited, so that a larger load cannot fall from this opening. If it is an open state of FIG.7 (b), even a big load can be taken out immediately. Two types of open states can be properly used as necessary.

Japanese Patent No. 3590037

The following problems remain in the structure on the back side of the dump truck platform of Patent Document 1 shown in FIGS. 6 and 7.
Since the rear door is attached to the back side of the gate frame, the floor surface of the loading platform becomes longer by the thickness of the vertical frame, which increases the floor area. As a result, the volume ratio of the vehicle verification is violated, and a structural change procedure such as vehicle improvement is required, which increases the cost.

  In view of the above-described problems, an object of the present invention is to provide a rear door of a dump truck loading platform in which the floor area of the loading platform is not increased by the rear door attached to the gate frame in the dump truck loading platform.

  In order to solve the above problems, the present invention provides the following configurations. The numbers in parentheses are reference numerals in the drawings to be described later, and are attached for reference.

The rear door of the dump truck bed according to the present invention extends along the rear edge of the horizontal frame (3A) and the left and right tilts (2B, 2C) extending along the rear edge of the floor (2A) of the dump truck bed (2). A U-shaped frame formed by connecting the left and right vertical frames (3B1, 3C1) and the upper end of each vertical frame (3B1, 3C1) can be swung to the vicinity of the rear end of the upper surface of each tilt (2B, 2C) The rear door is attached to the gate frame (3) having a pivot arm (3B2, 3C2) connected to the upper and lower shafts (6B2, 6C2) connected to the vicinity of the lower end of each vertical frame (3B1, 3C1) (6A), the lower ends of the vertical frames (3B1, 3C1) are aligned with the lower surface of the floor (2A), and the inner surfaces facing each other in the housing of the left and right vertical frames (3B1, 3C1) ( the rear door (6A) is disposed between the 3B11,3C11), said rear door (6A) left and right The open / close shaft (6B2, 6C2) is accommodated in the casing of the vertical frame (3B1, 3C1) and extends and contracts by the cylinder part (4B, 4C) that does not protrude downward from the vertical frame (3B1, 3C1) even when extended. Turns and opens and closes .

In the above, it is preferable that the front surface of the rear door (6A) is located on the same plane as the front surface of the casing of the vertical frame (3B1, 3C1).
In the above, it is preferable that the thickness of the rear door (6A) does not exceed the width of the inner side surface (3B11, 3C11) of the casing of the vertical frame (3B1, 3C1).

According to the rear door of the dump truck loading platform according to the present invention, since the rear door is disposed between the inner side surfaces of the vertical frame of the gate frame, the floor area does not increase even if the rear door is attached. Therefore, the same procedure as that of the dump truck to which the present invention is not applied becomes possible.
Further, there is an advantage that the unevenness on the back surface is reduced and the overall size is reduced.

FIG. 1 is a partial rear perspective view of a dump truck carrier that is an embodiment to which the present invention is applied. FIG. 2 is an exploded perspective view of the dump truck bed shown in FIG. FIG. 3A is a rear view and FIG. 3B is a left side view schematically showing a rear end portion of the cargo bed when the rear door is closed. FIGS. 4A and 4B are (a) a rear view and (b) a left side view schematically showing a rear end portion of the cargo bed when the rear door is unlocked. 5A is a rear view and FIG. 5B is a left side view schematically showing a rear end portion of the loading platform in the opened state of the rear door. FIG. 6 is a partial rear perspective view of a known dump truck platform. FIG. 7A is a left side view showing the opening / closing operation of the gate frame shown in FIG. 6, and FIG. 7B is a left side view showing the opening / closing operation of the rear door shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings showing examples.
FIG. 1 is a partial rear perspective view of a loading platform of a dump truck as an embodiment to which the present invention is applied. In addition, about the same structure as the well-known example of FIG.6 and FIG.7, it has shown with the same code | symbol. In addition, since the structure of the rear side of the dump truck loading platform related to the present invention is bilaterally symmetrical, the description of the left (right) side surface is similarly applied to the right (left) side surface.

  The loading platform 2 of the dump truck 1 is provided with a left wing 2B and a right wing 2C standing upright from both edges of the floor 2A ("left" and "right" in the present specification refer to the case viewed from the front). A gate frame 3 is attached to the back surface of the loading platform 2.

  The gate frame 3 extends along the rear end of the left vertical frame 3B1 and the right side 2C extending along the rear end of the left tilt 2B at both ends of the horizontal frame 3A extending along the rear end of the floor 2A. It is a U-shaped frame formed by connecting existing right vertical frames 3C1.

  Cylinder portions 4B and 4C are housed inside the casings of the vertical frames 3B1 and 3C1, respectively. Each cylinder part 4B, 4C comprises cylinder pipes 4B1, 4C1, respectively. The cylinder pipes 4B1 and 4C1 are arranged along the longitudinal direction of the casing of the vertical frames 3B1 and 3C1, respectively.

  In the embodiment to which the present invention is applied, the rear door portion 6 is disposed in a space surrounded by the U-shaped portion of the gate frame 3. The rear door portion 6 includes a rectangular plate-shaped rear door 6A.

  Near the left and right ends of the upper surface of the rear door 6A, rear door lock portions 5B and 5C are provided (details will be described in FIG. 2 and subsequent figures).

FIG. 2 is an exploded perspective view of the dump truck bed shown in FIG.
The gate frame 3 includes swivel arms 3B2 and 3C2 having one ends fixed to the upper surfaces of the vertical frames 3B1 and 3C1. The other ends of the swivel arms 3B2, 3C2 are attached to the swivel shafts 3B3, 3C3, and can swivel about the swivel shafts 3B3, 3C3. The turning shafts 3B3 and 3C3 are supported by turning bearing portions 3B4 and 3C4, respectively. The swivel bearing portions 3B4 and 3C4 are fixed to the upper surfaces of the left and right tilts 2B and 2C, respectively. As described above, the vertical frames 3B1, 3C1 are pivotally connected to the vicinity of the rear ends of the upper surfaces of the respective cages 2B, 2C by the swing arms 3B2, 3C2.

  With the swivel arms 3B2 and 3C2, in this embodiment, the gate frame 3 can be opened and closed in the same manner as the known structure shown in FIG. The gate lock pin 7A provided at the rear end of the floor 2A of the loading platform 2 and the gate hook 7B provided on the front surface of the horizontal frame 3A of the gate frame 3 are the same as the known structure.

  Stopper members 5B1 and 5C1, which are one of the members of the rear door lock portions 5B and 5C, are arranged inside the revolving arms 3B2 and 3C2. The distal ends of the stopper members 5B1 and 5C1 are located above the rear door 6A, and a hook-like lock claw 5C11 (shown only on the right side) is formed. Each of the stopper members 5B1, 5C1 can be turned around the turning shafts 3B3, 3C3. In this embodiment, the stopper members 5B1 and 5C1 share the axis with the turning arms 3B2 and 3C2, but they do not need to be shared and may be provided separately. However, it is preferable to share the shaft in order to simplify the structure and reduce the number of members.

  The casing of each vertical frame 3B1, 3C1 has a rectangular parallelepiped shape having inner side surfaces 3B11, 3C11, outer side surfaces 3B13, 3C13, three side surfaces of the front surface, and an upper surface and a lower surface. The cylinder part accommodated inside is rotatably supported by cylinder support shafts 4B7 and 4C7 whose both ends are fixed to the inner side surfaces 3B11 and 3C11 and the outer side surfaces 3B13 and 3C13.

  Further, in the vicinity of the lower ends of the inner side surfaces 3B11, 3C11 and the outer side surfaces 3B13, 3C13 of the casings of the vertical frames 3B1, 3C1, opening / closing bearing holes 3B12, 3C12 for rotatably supporting the opening / closing shaft 6B2 of the rear door 6A are formed. Has been.

Lock protrusions 6B3 and 6C3 are formed on the left and right ends of the upper surface of the rear door 6A of the rear door portion 6. When the rear door 6A is in the closed state, the lock claws 5C11 of the stopper members 5B1 and 5C1 are located on the back side of the lock protrusions 6B3 and 6C3 and face the lock protrusions 6B3 and 6C3. As a result, the lock protrusions 6B3 and 6C3 are prevented from moving to the back side, so that the rear door 6A is held (locked) in the closed state.
The rear door 6A is arranged between the inner side surfaces 3B11 and 3C11 facing each other in the housings of the left and right vertical frames 3B1 and 3C1. The front surface of the rear door 6A is preferably located on the same plane as the front surfaces of the casings of the vertical frames 3B1, 3C1. Moreover, it is preferable that the thickness of the rear door 6A does not exceed the width of the inner side surfaces 3B11 and 3C11 of the casings of the vertical frames 3B1 and 3C1.

  3A is a rear view and FIG. 3B is a left side view schematically showing a rear end portion of the cargo bed when the rear door 6A is closed. In (b), most of the outer side surface 3B13 of the casing of the vertical frame 3B1 is cut away so that the configuration inside the casing of the vertical frame 3B1 can be seen (the same applies to FIGS. 4 and 5). .

  A hydraulic cylinder including a cylinder pipe 4B1 and a cylinder rod 4B2 that expands and contracts from the lower end of the cylinder pipe 4B1 is accommodated inside the casing of the vertical frame 3B1. The hydraulic cylinder is expanded and contracted by operating a valve of the hydraulic device from the driver's seat. The illustration of the oil pressure hose connected to the cylinder tube 4B1 is omitted.

  A C-shaped rod end bearing 4B3 is attached to the tip of the cylinder rod 4B2 when viewed from the back. The rod end bearing portion 4B3 fixedly supports the rod end shaft 4B31 in the horizontal direction. The rod end shaft 4B31 rotatably supports one end of the link member 4B4. The link member 4B4 has a predetermined length, and the other end fixedly supports the opening / closing shaft 6B2 of the rear door 6A. The opening / closing shaft 6B2 extending in the horizontal direction from the vicinity of the lower end of the side surface of the rear door 6A is rotatably supported through the casing of the vertical frame 3B1.

In the present embodiment, the cylinder tube 4B1 is supported in the vertical frame 3B1 as follows.
A cylindrical portion 4B8 is integrally formed at the upper end of the cylinder tube 4B1. Oval holes 4B6 extending in the vertical direction by a predetermined distance are formed in both side surfaces of the cylindrical portion 4B8. The cylinder support shaft 4B7 passes through the pair of oblong holes 4B6. The diameter of the cylinder support shaft 4B7 is substantially the same as the width of the oval hole 4B6. Both ends of the cylinder support shaft 4B7 are fixed to the casing of the vertical frame 3B1. Since the cylinder support shaft 4B7 is fixed, the position of the cylindrical portion 4B8 can move in the vertical direction with respect to the cylinder support shaft 4B7 by a distance corresponding to the length of the oval hole 4B6. Since the cylindrical portion 4B8 is integral with the cylinder tube 4B1, the cylinder tube 4B1 can move by a predetermined distance in the vertical direction with respect to the cylinder support shaft 4B7. The predetermined distance is usually about 10 to 15 mm, for example, and is set to be larger than the height of the lock protrusions 6B3 and 6C3.

  Although not shown, as another example of the support means for the cylinder tube 4B1, the cylinder support shaft may be fixed to both side surfaces of the cylinder tube 4B1 and an oval hole may be formed in the casing of the vertical frame 3B1. Can fulfill the functions of

  One end of the unlocking member 4B5 is attached to the upper end of the cylindrical portion 4B8 integrated with the cylinder tube 4B1, and the unlocking member 4B5 extends upward.

  The stopper member 5B1 that is pivotally supported by the pivot shaft 3B3 extends to the back surface side, and one end of the interlocking member 5B2 is fixed to the front end portion thereof. The interlocking member 5B2 extends in the horizontal direction, and the other end is located inside the casing of the vertical frame 3C1. The interlocking member 5B2 can pivot integrally with the stopper member 5B1. The inner side surface 3B11 of the vertical frame 3C1 is appropriately cut out so as not to hinder the movement of the interlocking member 5B2.

  The unlocking member 4B5 extending upward from the cylinder pipe 4B1 contacts the interlocking member 5B2 from below. In the illustrated example, the unlocking member 4B5 and the interlocking member 5B2 are round bar shapes, but the shape is not limited thereto. The lock release member 4B5 may have any shape that can reliably push the interlocking member 5B2 from below.

  Furthermore, the cylinder tube 4B1 and the interlocking member 5B2 are connected by a spring 5B3. The lower end of the spring 5B3 is fixed to the cylinder tube 4B1 by a spring lower end support portion 5B4. The upper end of the spring 5B3 is fixed to the interlocking member 5B2.

  In the closed state of the rear door 6A shown in FIG. 3, the cylinder rod 4B2 is in the most shortened state. As illustrated, the oval hole 4B6 of the cylinder tube 4B1 (cylindrical portion 4B8) is located at the lowest position, that is, the lowest position with respect to the cylinder support shaft 4B7. That is, the cylinder pipe 4B1 is located at the lowest position in a predetermined movement distance in the up-down direction. At this time, the unlocking member 4B5 is also in the lowest position, and thus the interlocking member 5B2 is also in the lowest position. As a result, the lock claw 5B11 of the stopper member 5B1 and the lock projection 6B3 of the rear door 6A are engaged with each other so that the rear door 6A is locked and cannot be opened.

  4A is a rear view and FIG. 4B is a left side view schematically showing a rear end portion of the loading platform when the rear door 6A is unlocked. The operation of opening the rear door 6A is started by operating a valve of a hydraulic device (not shown). As a result, the cylinder rod 4B2 starts to expand. At the start of expansion of the cylinder rod 4B2, the cylinder tube 4B1 moves upward by the pulling force of the spring 5B3 (see arrow). When the cylinder tube 4B1 moves upward, the lock release member 4B5 pushes up the interlocking member 5B2. As a result, the stopper member 5B1 pivots upward (see the arrow), and the lock claw 5B11 also moves upward and is detached from the lock projection 6B3 of the rear door 6A.

  The upward movement of the cylinder tube 4B1 accompanying the extension of the cylinder rod 4B2 continues until the oval hole 4B6 reaches the highest position, that is, the highest position with respect to the cylinder support shaft 4B7. Due to the fixed cylinder support shaft 4B7, the cylinder pipe 4B1 is prevented from moving upward from the uppermost position.

  While the cylinder tube 4B1 moves a predetermined distance in the vertical direction from the lowest position to the highest position, the link member 4B4 does not move. After the cylinder pipe 4B1 reaches the uppermost position, when the cylinder rod 4B2 continues to extend further, the cylinder rod 4B2 starts to extend downward, and the link member 4B4 starts to rotate. As the link member 4B4 rotates, the opening / closing shaft 6B2 of the rear door 6A rotates and the rear door 6A starts to open.

  FIG. 5A is a rear view and FIG. 5B is a left side view schematically showing a rear end portion of the loading platform in the opened state of the rear door 6A. The cylinder rod 4B2 is in the most extended state (see arrow). As a result of the pivotal movement of the link member 4B4, the opening / closing shaft 6B2 is also pivoted. As a result, the rear door 6A is pivoted 90 degrees from the closed state (see arrow) and is lying down in the horizontal direction. During this time, the cylinder tube 4B1 remains at the uppermost position. Although not shown, for reinforcement, the upper end of the rear door 6A and the upper end of the gate frame 3 may be connected by a chain having an appropriate length.

  Further, when the rear door 6A is closed from the open state shown in FIG. 5, when the cylinder rod 4B2 is shortened, the process shown in FIG. Returning, the rear door 6A is automatically locked.

DESCRIPTION OF SYMBOLS 1 Dump truck 2 Loading platform 2A Floor 2B 1st tilt 2C 2nd tilt 3 Gate frame part 3A Horizontal frame 3B1, 3C1 Vertical frame 3B11, 3C11 Vertical frame inner side surface 3B12 Opening and closing bearing hole 3B13 Vertical frame outer side surface 3B2, 3C2 Turning arm 3B3, 3C3 Rotating shaft 3B4, 3C4 Rotating bearing portion 4B, 4C Cylinder portion 4B1, 4C1 Cylinder tube 4B2 Cylinder rod 4B3 Rod end bearing portion 4B31 Rod end shaft 4B4 Link member 4B5 Unlock member 4B6 Support shaft moving hole 4B7, 4C7 Cylinder support shaft 4B8 Cylinder 5B, 5C Rear door lock portion 5B1, 5C1 Stopper member 5B11, 5C11 Lock claw 5B2 Stopper interlocking member 5B3 Spring 5B4 Spring lower end support portion 6 Rear door portion 6A Rear door 6B2, 6C2 Open / close 6B3,6C3 lock projections 7A gate hook 7B gate hook lock pin

Claims (3)

Horizontal frame (3A) extending along the rear edge of the floor (2A) of the dump truck bed (2) and left and right vertical frames (3B1, 2C) extending along the rear edge of the left and right tilts (2B, 2C) 3C1) and a swivel arm (3B2, 3C2) that pivotably connects the upper end of each vertical frame (3B1, 3C1) to the vicinity of the rear end of the upper surface of each tilt (2B, 2C) ) and, to the gate frame (3) having a, a rear door which is attached by opening and closing shaft (6B2,6C2) coupled in the vicinity of the lower end of each vertical frame (3b1 and 3c1) (6A), the longitudinal The lower end of the frame (3B1, 3C1) is aligned with the lower surface of the floor (2A), and the rear door is located between the inner side surfaces (3B11, 3C11) facing each other in the casing of the left and right vertical frames (3B1, 3C1). (6A) is arranged, the rear door (6A) is inside the housing of the right and left of the vertical frame (3b1 and 3c1) Osamu Is and does not project below the said longitudinal frame (3b1 and 3c1) also during extension cylinder portion (4B, 4C) said control shaft by expansion and contraction of the (6B2,6C2) to pivot, dump truck loading platform of which is characterized in that opening and closing Rear door.   The rear door of the dump truck carrier according to claim 1, wherein the rear door (6A) is located on the same plane as the entire casing of the vertical frame (3B1, 3C1).   The dump truck platform according to claim 1 or 2, wherein the thickness of the rear door (6A) does not exceed the width of the inner side surface (3B11, 3C11) of the casing of the vertical frame (3B1, 3C1). Rear door.

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