JP2011173581A - Hinge structure of rotating member of cargo truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hinge structure which is used for a long time while it is protected in a simple structure so that it supports a horizontal door provided for convenience in loading and unloading of a cargo onto and from a platform of a cargo truck, and also supports a rotatable member such as a caster stopper to prevent a cargo from falling out, and which improves loading and unloading operability, while having a cargo protection function. <P>SOLUTION: Between a fixing member 3 and a tail gate 4 being a rotating member, an elastically deformable cover member 6 covering a hinge shaft 5 is equipped along the hinge shaft 5 in the longitudinal direction. The cover member 6 has: one end in a width direction fixed to the fixing member 3; and the other end fixed to the tail gate 4, and is arranged along the surfaces of the fixing member 3 and the tail gate 4 in its extending posture, while being arranged in a convex shape bent and formed with 2 cm or more protrusion d0 forward from the tail gate 4 in its standing posture. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a hinge structure that rotatably supports a rotating part such as a horizontal door provided for the convenience of loading and unloading a load from a loading platform of a transport vehicle and a caster stopper that prevents the load from jumping out.

  Some load carrying vehicles have a movable load receiving stand installed at the rear of the load carrier for the purpose of improving the efficiency of loading and unloading the load from the load carrier. As this movable load receiving table, the load receiving table is rotatably supported by a hinge shaft at the rear part of the loading table, and the load receiving table is tilted over the platform formed on the ground, or Some have a lifter mechanism that raises and lowers the load receiving platform between the loading platform and the ground. In addition, when the load receiving platform is landed, by making the tip slightly inclined downward, it is possible to facilitate the movement of the cart mounted on the load receiving platform. Some are provided with caster stoppers to prevent accidental slipping.

Patent Document 1 shows a tailgate that acts as a load receiving table and a delivery table. The tailgate described in Patent Document 1 is attached by a hinge shaft in the vicinity of the lower end of the rear part of the cargo bed, and is stored vertically in the rear part of the cargo bed when not in use, and with respect to the floor surface of the cargo bed when loading and unloading. Rotate to be flush. When not in use, it is possible to prevent inadvertent popping out of the cart, etc., and when carrying luggage, the cargo bed floor and the tail gate form a continuous surface, so it is easy to transfer luggage to the outside via the tail gate. It is possible.
However, in the above hinge structure, when the tailgate is retracted, the tailgate is configured to coincide with the opening at the rear of the loading platform, so the tailgate is arranged flush with the loading platform floor surface. Causes a gap between the tailgate and the rear end of the loading platform. For this reason, a step is generated between the tailgate and the loading platform, and workability during transportation by a carriage or the like is poor. In addition, dust easily enters the hinge shaft from this gap, and the tail gate is liable to hinder the movement of the tailgate due to dust biting into the hinge shaft.

Patent Documents 2 and 3 show a load receiving table having caster stoppers. The load receiving platform of Patent Document 2 and Patent Document 3 is a tailgate lifter that is installed at the rear of the truck and is folded so as to overlap the rear surface of the load platform. The tailgate lifter is supported by a lifter mechanism such as a jack so that the load receiving table can be moved up and down, and a belt plate-like caster stopper is provided in parallel with the tip at a position away from the front end of the load receiving table by a predetermined dimension. ing. The belt-like caster stopper is rotatably supported by a hinge shaft, and when the caster stopper is raised from the upper surface of the load receiving table, the caster such as a cart is brought into contact with the caster stopper from the load receiving table. It is designed to prevent falling out. Further, the load receiving table is formed with a recess that is stored flush with the upper surface of the load receiving table when the caster stopper is tilted.
Since these caster stoppers are open at the time of use, dust easily enters the hinge shaft, and there is a problem such as dust biting in the same manner as the hinge shaft of Patent Document 1 described above.

JP-A-9-118171 JP-A-8-40132 Japanese Patent No. 3521537

The present invention has been made in view of the above circumstances, and it is possible to rotate a horizontal door provided for the convenience of loading and unloading a load from a loading platform of a transport vehicle and a rotating member such as a caster stopper for preventing the load from jumping out. Provided is a hinge structure that protects a freely supported hinge structure with a simple structure and can be used for a long period of time, improves the workability of loading and unloading of a load, and has a load protection function.

  The present invention relates to a hinge structure that rotatably supports a rotating member between a standing posture and a rotating posture rotated from the standing posture with respect to a fixing member of a load carrying vehicle, the fixing member An elastically deformable cover member that covers the hinge shaft is provided along the length direction of the hinge shaft between the rotating member and the rotating member, and one end portion in the width direction of the cover member is fixed. It is fixed to the member, and the other end is fixed to the rotating member, and is arranged along the surface of the fixing member and the rotating member in the rotating posture, and the rotating in the standing posture. It is characterized in that the protruding amount from the member to the front is curved so as to protrude by 2 cm or more.

For example, when the fixed member is a cargo bed of a load carrying vehicle and the rotating member is a tail gate, the hinge structure functions as a rear door of the cargo bed by setting the tail gate in a standing posture, and the tail gate is raised. By adopting an overhanging posture (rotating posture) rotated from the posture, a carriage or the like can be moved thereon, and by setting the tailgate to a standing posture, it functions as a rear door of the cargo bed.
A gap is formed between the rear end of the loading platform as the fixing member and the base end of the tailgate as the rotation member because the tailgate rotates, but the clearance is covered by the cover member. Thus, foreign matter such as dust that prevents the tailgate from swinging is prevented from entering the gap. Further, since the space between the cargo bed and the tailgate is a continuous surface by the cover member, the carriage or the like can be easily moved.
In addition, the cover member is elastically deformable, and both sides in the width direction are fixed. Therefore, when the tailgate is in an upright position, the bent portion at the center portion caused by the approach of the both sides of the cover member is elastic. It is deformed and rounded and protrudes from the tailgate in a convex shape. When the width of this cover member is set appropriately and the tailgate is in a standing posture, the protruding amount protruding forward from the tailgate is 2 cm or more, so that the carriage on the cargo bed has a tail. It can be set to abut on the convex cover member before abutting on the gate, and the impact can be absorbed.

In the hinge structure of the present invention, a distance between the hinge shaft and one end portion of the cover member is set smaller than a distance between the hinge shaft and the other end portion of the cover member, and one end portion of the cover member is It is provided at a position above the hinge shaft.
By setting the cover member in such a manner, when the tailgate is in the standing posture, the cover member can be reliably projected from the tailgate.

Moreover, the hinge structure of this invention WHEREIN: It is good for the said cover member to provide the some protrusion on the surface along the length direction.
The protrusion provided on the cover member acts as an anti-slip when an operator or the like gets on the loading platform in the overhanging posture, and as an anti-slip when the carriage on the loading plate contacts in the standing posture. Works. Moreover, by providing this protrusion, a cover member can be reliably made to protrude in convex shape.

Furthermore, in the hinge structure of the present invention, a pair of reinforcing plate portions are provided on the back surface of the cover member from the center portion in the width direction to both end portions, and the center portion in the width direction of the reinforcing plate portion is It is good to be curved in the direction away from the back surface.
Since the reinforcing plate portion of the cover member has high rigidity, the center portion of the cover member can be reliably protruded, and the impact relaxation efficiency can be improved.
Note that the fixing member includes, in addition to the above-described loading platform and the like, a member that is rotatably supported such as a tailgate. For example, the tailgate may be a fixed member, and a flap rail provided at the tip of the tailgate may be a rotating member.

According to the hinge structure of the present invention, since the gap between the fixed member and the rotating member is covered with the cover member, it can be used for a long period of time by preventing biting of the hinge shaft due to entry of dust or the like. Can do. In addition, the cover member can easily move a cart or the like with a continuous surface between the fixed member and the rotating member when the rotating member is extended, and further has a convex curve when the rotating member is standing. It becomes a shape and can have a baggage protection function.

The principal part of the hinge structure of 1st Embodiment of this invention is shown, (a) is sectional drawing of the state which made the rotation member the standing posture, (b) is sectional drawing of the state which made the rotation member the overhanging posture is there. It is a perspective view which shows the rear part of the conveyance vehicle which supported the tailgate rotatably by the hinge structure of 1st Embodiment. FIG. 3 is a front view showing a state in which the tailgate of FIG. 2 is landed on a platform. The whole structure of the tailgate of 1st Embodiment is shown, (a) is a front view, (b) is the top view of the half. It is a front view which shows the rear part of the transport vehicle provided with the hinge structure of 2nd Embodiment of this invention. It is a front view which shows the whole structure of the load receiving stand of 2nd Embodiment. The main part of the hinge structure that bridges the rear part of the loading platform and the movable loading platform is shown. (A) shows a state in which the rotating member is in an upright posture, and (b) shows a state in which the rotating member is in an extended posture. The principal part sectional drawing of the hinge structure which is provided in the front-end | tip part of a load receiving stand and comprises a flap rail is shown, (a) is in the state which made the flap rail upright, (b) in the state which made the flap rail extended is there. It is a figure which shows the principal part sectional drawing of the hinge structure which is provided in the front-end | tip part of a load receiving stand and comprises a flap rail, and is a figure explaining reaction force measurement of a cover member. 1 is an overall view of a test apparatus for impact sound measurement.

Hereinafter, embodiments of the hinge structure of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention, in which a hinge structure of the present invention is provided between a rear end portion of a load carrier 2 and a base end portion of a tailgate 4 of a load carrying vehicle. ing.
This hinge structure has a fixing member 3 provided at the rear part of the loading platform 2 fixed to the vehicle body 1, a tail gate 4 as a rotating member, and a hinge for rotatably supporting the tail gate 4 with respect to the fixing member 3. An elastically deformable cover member 6 covering the vicinity of the shaft 5 is formed.

The hinge shaft 5 is formed of a fixed side hinge shaft 3 a formed on the fixed member 3 along the width direction of the loading platform 2, and a movable side hinge portion 4 a formed on the base end portion of the tailgate 4.
Each of the fixed-side hinge shaft 3a and the movable-side hinge portion 4a has a shape having a hook portion at the tip of the semi-cylindrical portion, and the semi-cylindrical portion of the movable-side hinge portion 4a on the outer peripheral surface of the semi-cylindrical portion of the fixed-side hinge shaft 3a. The inner peripheral surface of the part rotates while sliding. Then, when the tailgate 4 stands upright on the back surface of the cargo bed 2 shown by C1 in FIG. 3A, the hook portions are deeply engaged with each other to serve as a stopper, and the overhanging posture is projected rearward from the cargo bed 2 shown by A1. Sometimes, the tip portions of the hook portions are engaged with each other while the semi-cylindrical portions are pressed against each other to form a stopper. Then, the tailgate 4 is bridged on the platform P1 formed on the ground in the overhanging posture. The loading platform 2 is provided with a lock mechanism (not shown) that holds the tailgate 4 in a standing posture.

Further, as shown in FIG. 4, the tailgate 4 has a configuration in which a plurality of rail panels are combined. That is, as shown in FIG. 4, the tailgate 4 is configured such that a plurality of rail panels 11a, 11b, and 11c are connected in a planar shape, and both ends of the connected rail panels 11a, 11b, and 11c are bundled together. A side frame 12 is attached to the frame. Each rail panel 11a, 11b, 11c includes a distal end rail panel 11a disposed at the distal end portion of the tailgate 4, a plurality of intermediate rail panels 11b disposed at the intermediate portion, and a proximal end portion disposed at the proximal end portion. Three types of rail panels 11c are provided. In this case, although the base end rail panel 11c is shown in FIG. 1, each of the rail panels 11a, 11b, and 11c is made of a hollow shape formed by extrusion molding of an aluminum alloy, and a pair of flat plates 13a. , 13b are connected to each other by vertical ribs 14.
And each middle part rail panel 11b is mutually connected, and the front-end | tip part rail panel 11a and the base end part rail panel 11c are each connected with the both ends of the intermediate | middle part rail panel 11b of the connection state. In addition, on the surfaces of the flat plates 13a, 13b of the rail panels 11a, 11b, 11c, concave grooves 16a, 16b having a slight depth along the width direction are formed in parallel to each other for slip prevention or the like. . In the example shown in FIGS. 1 to 4, the groove 16b formed in the lower flat plate 13b is formed shallower than the groove 16a formed in the upper flat plate 13a. A resin plate 17 serving as a landing portion is fixed along the width direction on the lower surface of the tip end rail panel 11 a of the tailgate 4. And the movable side hinge part 4a which fits rotatably to the fixed side hinge axis | shaft 3a of the fixed member 3 is integrally formed in the base end part rail panel 11c of the tailgate 4 along the width direction.

Further, a groove 3e is formed along the width direction of the tailgate 4 on the upper surface of the fixing member 3 at a position slightly away from the fixed-side hinge shaft 3a, and the tailgate 4 is also slightly away from the movable-side hinge 4a. A similar groove portion 4e is formed at a distant position, and a belt-like cover member 6 is provided in a state in which both side portions are fitted to both the groove portions 3e and 4e. The cover member 6 is made of an elastic member such as rubber, and a plurality of protrusions 6c for preventing slippage are formed on the surface in parallel along the width direction of the tailgate 4 (length direction of the cover member 6). ing. As a material for the cover member 6, ethylene propylene rubber, butyl rubber, and chloroprene rubber are optimal from the viewpoint of weather resistance and wear resistance.
Further, the groove 4e of the tail gate 4 and the groove 3e of the fixing member 3 are formed in a dovetail shape whose width is larger in the inside than the opening. On the other hand, on both sides of the cover member 6, rod-shaped portions 6 a and 6 b having a circular section with an increased thickness are integrally formed, and the rod-shaped portions 6 a and 6 b are formed into the groove portion 3 e of the fixing member 3 and the groove portion 4 e of the tailgate 4. It is fitted and is prevented from coming off.

  Then, as shown in FIG. 1B, when the tailgate 4 is tilted to the extended position, the cover member 6 has a substantially flat plate shape along the surface of the fixing member 3 and the tailgate 4 provided on the loading platform 2. When the tailgate 4 is placed in a standing posture as shown in FIG. 1A, the rod-like portions 6a and 6b of the cover member 6 approach each other. Therefore, the cover member 6 is bent and the center portion in the width direction of the cover member 6 protrudes from the tailgate 4 in a convex shape. By setting the cover member 6 so that the protruding amount d0 forward from the tailgate 4 protrudes 2 cm or more when the tailgate 4 is in the standing posture, the carriage W on the loading platform 2 is The caster R of the carriage W is brought into contact with the convex cover member 6 before coming into contact with the tailgate 4 so as to reduce the impact and the impact sound at the time of contact.

  Further, as shown in FIG. 1, the distance d1 between the rotation center of the hinge shaft 3a and the groove 3e of the fixed member 3 is smaller than the distance d2 between the rotation center of the fixed-side hinge shaft 3a and the groove 4e of the tailgate 4. And providing the groove 3e of the fixing member 3 at a position above the rotation center of the fixed-side hinge shaft 3a, so that the cover member 6 is projected from the tailgate 4 when the tailgate 4 is in an upright posture. It is in a protruding state.

In the hinge structure configured as described above, when the transport vehicle is operated, as shown by C1 in FIG. 3, the tailgate 4 is placed on the back surface of the loading platform 2 to stand in a standing posture, and when loading and unloading work, As shown by A1, the tailgate 4 is rotated to the overhanging posture so as to extend the floor surface of the loading platform 2.
A cover member 6 in which a caster R of the carriage W protrudes from the tailgate 4 before the carriage W comes into contact with the tailgate 4 when a load of the carriage W moves on the carriage 2 and collides with the tailgate 4 when the vehicle is driven. Because of this, the cover member 6 becomes a cushioning material and can absorb the impact. A circle with a two-dot chain line in FIG. 1A indicates the caster R of the carriage W, and a two-dot chain line L indicates a box-shaped baggage. In this case, the caster R of the carriage W can abut against the central portion of the cover member 6 to absorb the shock. Further, as shown in the figure, even when the luggage L is not placed on the carriage, the luggage L collides with the protruding cover member 6, so that the occurrence of damage or the like can be prevented.

Next, the tailgate 4 is set in an overhanging posture, and the carriage W on the loading platform 2 is moved to the platform P1. At this time, since the cover member 6 covers the gap between the floor surface of the loading platform 2 and the receiving surface of the tailgate 4 and communicates with the same surface, the carriage W can be moved smoothly. Further, since the gap is covered with the cover member 6, it is possible to prevent foreign matters such as dust that would hinder the rotation of the tailgate 4 from entering the gap. Further, the protrusion 6c provided on the cover member 6 acts as an anti-slip when an operator or the like gets on the loading platform 2 in the overhanging posture, and the carriage on the loading platform 2 abuts in the standing posture. In addition, the cover member 6 can reliably project in a convex shape.
When loading the cargo onto the carrier platform 2 of the transport vehicle, the order described above is reversed, and after passing the overhanging tailgate 4 and placing the carriage, the tailgate 4 is raised and locked. do it.

5 to 8 show a second embodiment of the present invention. In this embodiment, the load carrying vehicle is provided with a load receiving platform lifting device, and is provided at a front end portion of the load receiving stand 7 with a hinge structure that bridges the load receiving stand 7 and the rear portion of the load receiving stand 7. The hinge structure which comprises is provided.
As shown in FIG. 5, the loading platform lifting device is a so-called tailgate lifter that is provided on the vehicle body 1 via a mounting frame 20 and is arranged at the rear portion of the loading platform 2 fixed on the vehicle body 1. A pair of left and right link mechanisms 21 extending rearward of the vehicle body 1 are provided on the mounting frame 20 provided at a position below the loading platform 2, and the loading platform 7 is attached to the distal end portions of these link mechanisms 21. Then, the load receiving platform 7 is driven by a lifter mechanism (not shown) such as a hydraulic jack through the link mechanism 21 so that the load receiving platform 7 is loaded as shown in A2 in FIG. Ascending and descending between the overhanging posture extending the floor surface of 2 and the landing posture placed on the ground as shown by B2, and standing up on the back of the loading platform 2 as shown by C2 during operation, etc. And can be

  As shown in FIG. 6, the load receiving table 7 includes a plurality of rail panels 11 a, 11 b, 11 c, and a strip-shaped flap rail 8 provided along the width direction at the front end of the front end rail panel 11 a. It is configured. The main configurations of the rail panels 11a, 11b, and 11c are the same as those of the first embodiment, and the same reference numerals are given to the common parts with the first embodiment and the description thereof is omitted.

  As shown in FIG. 7, the hinge structure provided at the rear end portion of the loading platform 2 includes a fixing member 30 provided at the rear end portion of the loading platform 2, a rotating member 40, and a rotating member 40 with respect to the fixing member 30. It is comprised from the cover member 60 which can be elastically deformed and covers the hinge axis | shaft 50 which supports so that rotation is possible. The hinge shaft 50 includes a fixed-side hinge shaft 30 a formed along the width direction of the loading platform 2 on the fixed member 30 and a movable-side hinge portion 40 a provided at the base end portion of the rotating member 40. Each of the fixed-side hinge shaft 30a and the movable-side hinge portion 40a has a shape having a hook portion at the tip of the semi-cylindrical portion, and the movable-side hinge portion 40b is formed on the outer peripheral surface of the semi-cylindrical portion of the fixed-side hinge shaft 30a. The inner peripheral surface rotates while sliding. Thereby, the rotating member 40 is rotated between the standing posture standing upright on the back surface of the cargo bed 2 shown in FIG. 7A and the protruding posture protruding rearward from the cargo bed 2 shown in FIG. 7B. It is done. The rotating member 40 is configured to be bridged from the loading platform 2 onto the loading platform 7 in the overhanging posture. Further, a plurality of protrusions 40 c for preventing slippage are formed in parallel on the surface of the distal end portion of the rotating member 40 along the width direction of the loading platform 2.

The fixed-side hinge shaft 30a is provided with contact portions 30b and 30c for restricting the rotation of the rotating member 40 between the standing posture and the protruding posture. The state in which the movable hinge 40a is in contact with the contact portion 30b is a standing posture, and the state in which the movable hinge 40a is in contact with the contact portion 30c is an overhanging posture. The fixing member 30 is provided with lock mechanisms 9 that hold the standing posture state of the rotating member 40 on both sides in the width direction of the loading platform 2 (FIG. 7 shows only the vicinity of one side thereof. Show). One end of the lock mechanism 9 is rotatably supported by a fixing bracket 31 fixed to the fixing member 30, and a hook 9 a detachably attached to the rotating member 40 is provided at the other end.
When the rotating member 40 is tilted and extended in a state where the lock mechanism 9 is released, the movable-side hinge portion 40a of the rotating member 40 is fixed to the fixed member 30 as shown in FIG. It abuts against the abutment surface 30c of the fixed-side hinge shaft 30a and functions as a stopper, and restricts further downward rotation (clockwise in the figure).

  Further, a groove 30e is formed along the width direction of the loading platform 2 on the upper surface of the fixed member 30 at a position slightly away from the fixed-side hinge shaft 30a, and the rotating member 40 is also slightly extended from the movable-side hinge 40a. A similar groove portion 40e is formed at a distant position, and a belt-like cover member 60 is provided in a state where both side portions are fitted to both the groove portions 30e and 40e. The cover member 60 is made of an elastic member such as rubber, and a plurality of protrusions 60c for preventing slipping are formed on the surface in parallel along the width direction of the cargo bed 2 (length direction of the cover member 60). Yes. A pair of reinforcing plate portions 61 are provided on the back surface of the cover member 60 from the center in the width direction of the cover member 60 to both sides. The reinforcing plate portion 61 has both sides in the width direction provided integrally on the back surface of the cover member, and a central portion in the width direction is formed to be curved away from the back surface of the cover member 60. On both side portions of the cover member 60, bar-shaped portions 60a and 60b having a circular section with an increased thickness are integrally formed. On the other hand, the groove 40e of the rotating member 40 and the groove 30e of the fixing member 30 are formed in a dovetail shape whose width is larger in the inside than the opening, and the rod-like portions 60a and 60b of the cover member 60 are formed. Is fitted into the groove 40e of the rotating member 40 and the groove 30e of the fixing member 30 and is prevented from coming off.

  Then, as shown in FIG. 7B, when the rotating member 40 is tilted and placed in the overhanging posture, the cover member 60 is substantially flat along the surface of the fixing member 30 and the rotating member 40 provided on the loading platform 2. When the rotating member 40 is disposed in the upright position as shown in FIG. 7A, the rod-shaped portion 60a of the cover member 60 is covered with the rotating member 40 and the fixing member 30. , 60b approach, the cover member 60 is bent and the central portion in the width direction of the cover member 60 protrudes from the rotating member 40 in a convex shape. By setting the cover member 60 to a convex shape in which the forward projection amount d10 from the rotating member 40 protrudes by 2 cm or more when the rotating member 40 is in the standing posture, the caster of the carriage W on the loading platform 2 is set. R is set to abut against the convex cover member 60 before abutting against the rotating member 40, and is configured to mitigate the impact and impact sound at the abutment.

  Further, as shown in FIG. 7, the distance d11 between the rotation center of the fixed side hinge shaft 30a and the groove 30e of the fixed member 30 is the distance d12 between the rotation center of the fixed side hinge shaft 30a and the groove 40e of the rotating member 40. And the groove 30e of the fixing member 30 is provided at a position above the rotation center of the hinge shaft 50, so that the cover member 60 protrudes from the rotation member 40 when the rotation member 40 is in the upright posture. It is in a state protruding in a shape.

Next, as shown in FIG. 8, the hinge structure provided at the front end portion of the load receiving table 7 and constituting the flap rail 8 rotatably supports the load receiving table 7, the flap rail 8, and the flap rail 8. An elastically deformable cover member 62 that covers the hinge shaft 52 is formed. The hinge shaft 52 is composed of a cylindrical portion (fixed side hinge shaft) 7 a formed integrally along the width direction of the load receiving platform 7 and a movable side hinge portion 8 a provided at the base end portion of the flap rail 8. The
The cylindrical portion 7a provided at the tip of the load receiving platform 7 has a shape having an arc cross section corresponding to approximately 3/4 of a circle. The opening groove portions 71 for the remaining ¼ circumference are arranged so as to open from the front end direction to the upper side of the load receiving stand 7 when the load receiving stand 7 is horizontally arranged.

The flap rail 8 communicates between the front end of the surface of the load receiving stand 7 and the ground at an appropriate angle with a downward slope, and is formed in a band plate shape as a whole. A movable side hinge portion 8a is formed in the shape portion 7a. And it is provided to extend outward from the movable hinge portion 8a fitted in the cylindrical portion 7a via the opening groove portion 71, and a slightly thick grounding portion 81 is formed on the back surface of the tip portion. Has been. In addition, a plurality of protrusions 8c for preventing slipping are formed on the surface of the front end portion of the flap rail 8 in parallel along the length direction.
Further, the front end portion of the flap rail 8 is notched at both end portions in the width direction of the load receiving table 7, and the end portion of the movable hinge portion 8 a extends sideways at the notch portion. . In the movable side hinge portion 8a, at least both end portions protruding from the front end portion of the flap rail 8 are formed in a C-shaped cross section by a slot 82 along the length direction.

  Further, lock levers 90 are respectively attached to the upper surfaces of both side frames 12 where both notches of the flap rail 8 are arranged in the load receiving platform 7 (FIG. 8 shows only the vicinity of one side thereof. ). The lock lever 90 is rotatably supported by a hinge shaft 12 a fixed to the side frame 12. The hinge shaft 12a is fixed along the width direction of the load receiving platform 7 by a fixing bracket 12b. A cylindrical portion 91 is formed at the base end portion of the lock lever 90, and the cylindrical portion 91 is rotatably fitted to the hinge shaft 12a. Therefore, the length direction of the lock lever 90 is arranged along the length direction of the load receiving table 7, and is directed from the hinge shaft 12 a to the front end direction of the load receiving table 7.

Further, the lock lever 90 has a rotating end portion as an operation piece 92, and a lock piece 93 protruding in a direction (rotation direction) perpendicular to the operation piece 92 at an intermediate position in the length direction. Accordingly, the lock lever 90 as a whole is formed so that the side surface has a T-shape. In this case, the fixed position of the hinge shaft 12a is set to a positional relationship in which the lock piece 93 can be advanced and retracted into the opening groove portion 71 of the cylindrical portion 7a by rotating the lock lever 90.
Further, the movable side hinge portion 8a of the flap rail 8 fitted in the cylindrical portion 7a, and the slot 82 opened to the side of the movable side hinge portion 8a by rotating this flap rail 8 is a load receiving base. 7 in which the opening direction of the slot 82 is perpendicular to the upper surface of the load receiving table 7 within the opening angle range of the opening groove 71 (the load receiving table 7 is When the landing posture is set in the upward direction, when the lock piece 93 of the lock lever 90 is inserted into the opening groove 71, the opening groove 71 passes through the opening groove 71 as shown in FIG. The flap rail 8 can enter the slot 82 of the movable hinge 8a.

The lock piece 93 is configured to enter the slot 82 of the movable hinge portion 8a of the flap rail 8 so that the rotation of the flap rail 8 is constrained. The movable hinge portion 8a of the flap rail 8 is constrained. And the lock lever 90 constitute a lock mechanism for the flap rail 8. In this locked position, the flap rail 8 stands up at an angle of, for example, θ1 = 80 ° with respect to a plane along the upper surface of the load receiving table 7, and the lock lever 90 is as shown in FIG. In addition, the operation piece 92 protrudes from the load receiving stand 7 so as to protrude in the distal direction.
Note that claw portions 94 and 84 that are engaged when locked are formed at the tip of the lock piece 93 of the lock lever 90 and the movable hinge portion 8a of the flap rail 8. The claw portions 94 and 84 are not released from the engagement state to the extent that vibration during movement of the carriage is applied, but with a force that allows the operator to release the lock state by lifting the operation piece 92 of the lock lever 90. Engaged.

On the other hand, when the flap rail 8 is tilted and protrudes downward from the front end surface of the load receiving tray 7 in the unlocked state by the lock lever 90, as shown in FIG. The contact portion 7b abuts on the lower surface of the flap rail 8 to function as a stopper and restricts the further downward rotation (clockwise in the figure).
In the example shown in FIG. 8, when the flap rail 8 has an inclination angle of, for example, θ2 = 30 ° with respect to the plane along the surface of the load receiving table 7, the contact portion of the tip portion of the cylindrical portion 7 a 7b, the lower surface of the flap rail 8 comes into contact, and in this contact state, the ground contact portion 81 at the tip of the flap rail 8 is disposed substantially on the horizontal plane with the landing portion of the load receiving platform 7.

  Further, a groove portion 7e is formed along the width direction of the load receiving base 7 on the upper surface at a position slightly away from the cylindrical portion 7a, and the flap rail 8 is also at a position slightly away from the movable side hinge portion 8a. A similar groove portion 8e is formed, and a belt-like cover member 62 is provided in a state in which both the side portions are fitted to the both groove portions 7e, 8e. The cover member 62 is made of an elastic member such as rubber, and a plurality of protrusions 62c for preventing slipping are formed on the surface in parallel along the width direction of the load receiving base 7 (length direction of the cover member 62). ing. Moreover, the groove part 7e of the load receiving stand 7 and the groove part 8e of the flap rail 8 are formed in the dovetail shape whose width dimension is larger inside than an opening part. On the other hand, rod-shaped portions 62a and 62b having a circular cross section with an increased thickness are integrally formed at both ends of the cover member 62. It is fitted and is prevented from coming off.

  Then, as shown in FIG. 8B, when the flap rail 8 is tilted and arranged in an overhanging posture protruding from the load receiving table 7, the cover member 62 is substantially flat along the surfaces of the flap rail 8 and the load receiving table 7. When the gap between the movable hinge portion 8a of the flap rail 8 and the cylindrical portion 7a of the load receiving base 7 is covered, while the flap rail 8 is arranged in an upright position as shown in FIG. Since the rod-like portions 62a and 62b of the cover member 62 approach each other, the cover member 62 is bent and the widthwise central portion of the cover member 62 is protruded in a convex shape. When the cover member 62 is set to a convex shape in which the forward projection amount d20 from the flap rail 8 protrudes by 2 cm or more when the flap rail 8 is set in the standing posture, the carriage on the load receiving platform 7 becomes the flap rail 8. It is set to abut against the convex cover member 62 before it abuts, and is configured to mitigate the impact and impact sound at the abutment.

Further, as shown in FIG. 8, the distance d21 between the rotation center of the movable side hinge portion 8a and the groove portion 7e of the load receiving base 7 is set smaller than the distance d22 between the rotation center of the movable side hinge portion 8a and the groove portion 8e. By providing the groove 7e at a position above the rotation center of the hinge shaft 52, the cover member 62 protrudes from the flap rail 8 in a convex shape when the flap rail 8 is in an upright posture.
In this embodiment, the rotating member 40 and the flap rail 8 are formed by extrusion molding of an aluminum alloy, but may be formed of a steel material, a hard resin, or the like.

In the hinge structure configured as described above, when the transporting vehicle is operated, as shown by C1 in FIG. 5, the load receiving platform 7 is placed on the back of the loading platform 2 to stand in a standing posture, and when loading and unloading work, The load receiving platform 7 is driven by a lifter mechanism (not shown) through the link mechanism 21 and between a projecting posture that extends the floor surface of the loading platform 2 indicated by A1 and a landing posture that is placed on the ground G indicated by B1. Go up and down.
During operation of the vehicle, the hinge mechanism provided at the rear end of the loading platform 2 is held in a standing posture. For this reason, when a load moves on the loading platform 2 and collides with the rotating member 40, the cover member 60 comes into contact with the cover member 60 protruding in a convex shape from the rotating member 40. Can be absorbed. Further, the cover member 60 is provided with a reinforcing plate portion 61. Since the reinforcing plate portion 61 has high rigidity, the center portion of the cover member 60 can be reliably projected, and further Impact relaxation efficiency is improved.

When unloading the load loaded on the loading platform 2 of the vehicle, as shown by A1 in FIG. 5, the loading platform 7 is placed in an overhanging posture so as to extend the floor surface of the loading platform 2, and the flap rail 8 at the tip is attached. As shown in FIG. 8 (a), it is raised and locked in a standing posture. Then, the locking mechanism 9 of the hinge mechanism (see FIG. 7) provided at the rear end of the loading platform 2 is released, the loading platform 2 and the loading platform 7 are bridged as an overhanging posture, and the cart on the loading platform 2 is loaded with the loading platform. 7 Move up. At this time, since the cover member 60 covers the gap between the floor surface of the loading platform 2 and the loading platform of the loading platform 7 and communicates with the same surface, the carriage can be moved smoothly.
Next, after a load is transferred from the loading platform 2 onto the loading platform 7, the loading platform 7 is lowered and landed by a lifter mechanism. When the carriage moves on the load receiving table 7 and collides with the flap rail 8 due to an impact at the time of landing, the cover member 62 comes into contact with the cover member 62 that protrudes from the flap rail 8 and is rounded in a convex shape. Becomes a cushioning material and can absorb impact.

When the load receiving platform 7 is landed, the lock lever 90 is lifted by lifting the operation piece 92 of the lock lever 90 that locks the flap rail 8 to enter the slot 82 of the movable hinge portion 8a of the flap rail 8. When the lock piece 93 is removed, the locked state of the flap rail 8 in the standing posture is released. Therefore, the flap rail 8 is tilted so as to project toward the tip of the load receiving table 7, and as shown in FIG. 8B, the tip of the load receiving table 7 and the ground G are connected in a downward gradient. In this state, the lower surface of the flap rail 8 comes into contact with the contact portion 7b of the cylindrical portion 7a of the load receiving table 7, and further downward rotation is restricted.

Next, the cart on the load receiving stand 7 is moved to the ground with the flap rail 8 overhanging. At this time, the flap rail 8 communicates between the load receiving platform 7 and the ground with a downward slope, and the gap between the flap rail 8 and the load receiving platform 7 is covered by the cover member 62, so that the carriage can be moved smoothly. Can do. Further, the cover member 62 prevents foreign matters such as dust from entering the gap.
When loading the cargo onto the carrier platform 2 of the transport vehicle, the order described so far was reversed, and the carriage was placed on the landing rail 7 on the flap rail 8 in an overhanging posture. Thereafter, the flap rail 8 is locked in a standing posture, the load receiving platform 7 is raised to the floor surface position of the loading platform 2 by a lifter mechanism, and the load is transferred to the loading platform 2.

Next, the Example which concerns on the hinge structure of this invention is described.
The configuration of the flap rail is the same as that of the flap rail 8 of the second embodiment shown in FIG. 8, and only the cover member 62 is formed of two types of ethylene propylene rubber (EPDM: hardness 60 °, 70 °) having different hardness. What was done was used. As shown in FIG. 9, the cover members 62 having different hardnesses were attached to the front end portion of the load receiving base 7 and the flap rail 8, and the following tests were performed.

(Reaction force measurement)
The difference in the lifting load of the flap rail due to the difference in the hardness of the cover member was evaluated. As shown in FIG. 9, an arbitrary measurement position F of the flap rail 8 is pulled up by a crane with a scale, and the load when the flap rail 8 is pulled up from the extended position to the lifting height H is measured. The measurement results are shown in Table 1.
In Table 1, the measurement position F of the flap rail 8 is indicated by a distance L from the rotation center of the movable hinge portion 8a of the flap rail 8 to the measurement position F, and measured at four points of distance L = 75, 95, 115, 135 mm. did. In addition, the measurement position F shown in FIG. 9 is a case where the distance L = 135 mm, and is located on the ground contact portion 81 of the flap rail 8. Further, the lifting height H indicates the lifting height from the ground G, and the load was measured at two points of the lifting height H = 100 and 150 mm. In addition, the raising height H shown in FIG. 9 is a case of 150 mm, and the flap rail 8 is a standing posture.

  As shown in Table 1, it was confirmed that the cover member having a lower hardness (hardness 60 °) had a smaller load when pulling up the flap rail. Further, the difference in hardness between 60 ° and 70 ° is about several kg at the grounding portion of the flap rail. It can be seen that there is no significant difference between the two cover members, and that it can be easily rotated in either case.

(Impact sound measurement)
The difference in impact sound due to the presence or absence of the cover member and the difference in rubber hardness was evaluated. As shown in FIG. 10, with the load receiving stand 7 inclined at θ = 10 ° and the flap rail 8 at the tip end fixed in an upright position, the cart is rolled from above the load receiving stand 7, and the flap rail 8 is The impact sound at the time of contact was measured. The impact sound was measured by installing a noise measuring device at a position 200 mm away from the flap rail 8 and evaluated using the maximum value of the impact sound. As the carriage W, a truck mounted with a weight of 10 kg in addition to a body weight of 25 kg was used. Moreover, the cart W was rolled from the points of the travel distance S = 300 mm and 500 mm.

  As shown in Table 2, it was confirmed that there was a difference in the magnitude of the impact sound depending on the presence or absence of the cover member, and that a silencing effect was obtained by using the cover member. Regarding the difference in the hardness of the cover member, it was found that the cover member having a higher hardness (hardness 70 °) can obtain a higher silencing effect.

  As described above, according to the hinge structure of the present embodiment, by employing a cover member, it is possible not only to prevent biting due to intrusion of dust and the like on the hinge shaft, but also to enable long-term use. In the standing posture of the flap rail, it can function as a cushioning material when a cart or the like comes into contact with the flap rail, and can have a baggage protection function. In addition, the cover member can be used properly by selecting the hardness according to the application, for example, improving the operability of the flap rail and reducing the impact and impact sound when the flap rail comes in contact with the carriage. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, the lock mechanism that fixes the rotating member in the standing posture is not limited to that of the above-described embodiment, and may have an appropriate configuration. Moreover, although it was set as the structure which provides a lock mechanism in the both sides of a cargo receiving stand, respectively, you may provide only in one side.
In the above-described embodiment, the hinge structure of the present invention is used for the tailgate and the flap rail. However, the present invention is not limited to this. For example, a hinge such as a tilt that opens and closes the side surface of the loading platform of the transport vehicle. It can also be applied to structures. Even in this case, by covering the gap between the cargo bed and the tilt with the cover member, the hinge shaft can be prevented from being caught due to intrusion of dust and the like, and the hinge structure can be used for a long time. In addition, the cover member protrudes in a convex shape during the tilting posture, so that it can have a baggage protection function. In this case, the tilt is rotated approximately 180 ° from the standing posture. In the present invention, the overhanging posture of the embodiment and the posture after turning 180 ° like the tilt are referred to as a turning posture.
In the present invention, both the platform P1 and the ground G are set as the ground, and landing is performed by dropping the load receiving platform thereon.

DESCRIPTION OF SYMBOLS 1 Car body 2 Loading platform 3,30 Fixed member 3a, 30a Fixed side hinge axis | shaft 3e, 4e, 7e, 8e, 30e, 40e Groove part 4 Tail gate 4a, 8a, 40a Movable side hinge part 5, 50, 52 Hinge axis | shaft 6,60 , 62 Cover member 6a, 6b, 60a, 60b, 62a, 62b Rod-like part 6c, 8c, 40c, 60c, 62c Projection 7 Load receiving base 7a Cylindrical part (fixed side hinge shaft)
7b, 30b, 30c Contact part 8 Flap rail 9 Lock mechanism 9a Hook 11a, 11b, 11c Rail panel 12 Side frame 12a Hinge shaft 13a, 13b Flat plate 14 Vertical rib 16a, 16b Groove 17 Resin plate 20 Mounting frame 21 Link Mechanism 31 Fixing bracket 40 Rotating member 61 Reinforcing plate portion 71 Opening groove portion 81 Grounding portion 82 Slots 84 and 94 Claw portion
90 Lock lever 91 Cylindrical part 92 Operation piece 93 Lock piece

Claims (4)

A hinge structure that rotatably supports a rotating member between a standing posture and a rotating posture rotated from the standing posture with respect to a fixed member of a cargo transporting vehicle, wherein the fixing member and the rotating member are supported. An elastically deformable cover member that covers the hinge shaft is provided between the member and the length direction of the hinge shaft, and one end portion in the width direction of the cover member is fixed to the fixing member. The other end is fixed to the rotating member, and is disposed along the surfaces of the fixing member and the rotating member in the rotating posture, and forward from the rotating member in the standing posture. A hinge structure characterized by being formed into a convex shape with a protruding amount of 2 cm or more protruding. The distance between the hinge shaft and one end of the cover member is set smaller than the distance between the hinge shaft and the other end of the cover member, and the one end of the cover member is positioned above the hinge shaft. The hinge structure according to claim 1, wherein the hinge structure is provided on the hinge structure. The hinge structure according to claim 1, wherein the cover member has a plurality of protrusions provided on a surface thereof along a length direction. A pair of reinforcing plate portions are provided on the back surface of the cover member from the central portion in the width direction to both end portions, and the central portion in the width direction of the reinforcing plate portion is curved and formed in a direction away from the back surface of the cover member. The hinge structure according to any one of claims 1 to 3, wherein the hinge structure is provided.

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