JP5500722B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving platform lifting apparatus including a load receiving platform that is movable up and down between a ground and a load loading platform.

  For example, as shown in FIG. 6 (a), a pivotable load receiving table is known that is stored in a standing state between a pair of posts 92 erected on the left and right sides at the rear of the vehicle. The load receiving platform 91 is connected to and supported by a slider 92a protruding rearward from the post 92 so as to be movable up and down in the direction of arrow A1, and in the state of being rotated and leveled, it is moved up and down in the direction of arrow A2 together with the slider 92a. It is possible.

  The load receiving platform 91 is a group in which two torsion bars 93 that bias upward rotation are on the rotation axis side so that smooth upward rotation operation is performed against the weight of the load receiving platform 91 and the like. It is built in the end 91a (Patent Document 1). As shown in FIG. 6 (b), each torsion bar 93 has a bent one end portion 93a fixed in a fixed holder 94, and the other end portion 93b is put in a support holder 95 near the center of the vehicle width ( It is supported in a non-fixed state. By arranging the torsion bar 93 in this way, when the load receiving table 91 is rotated from the standing state to the horizontal state, the torsion bar 93 also rotates in conjunction with it, but its one end 93a remains fixed. Therefore, a twisting force is generated in the torsion bar 93. As a result of this twisting force, an urging force for urging the load receiving table 91 in an upright state is generated, and the load receiving table 91 is smoothly rotated upward using this urging force.

JP-A-57-080937

  However, in a state in which the torsion bar 93 is arranged so as to generate the above-described twisting force, the durability performance of the torsion bar 93 is lowered and the torsion bar 93 may be damaged or broken as the number of uses increases. In particular, the refracted portion P at the fixed one end portion 93a may break. In such a case, the torsion bar 93 needs to be replaced.

  The base end portion 91a of the load receiving platform 91 generally includes a storage portion 911 that stores the torsion bar 93, and a cover portion 912 that covers the torsion bar 93 in a state where the torsion bar 93 is arranged in the storage portion. The cover portion 912 is welded to the storage portion 911 so as to close the space in which the torsion bar 93 is stored as indicated by an arrow A3. The desired strength is secured in the entire load receiving tray 91 by being fixed by welding. For this reason, as shown in FIG. 6B, the torsion bar 93 is almost entirely housed in the base end portion 91a, and the exposed portion is a portion sandwiched between the base end portion 91a and the fixed holder 94 (the portion 93c in the figure). ).

  Therefore, in order to take out the torsion bar 93, it is necessary to grip the above-described exposed portion 93c and pull out the torsion bar 93, or to remove the cover portion 912 from the storage portion 911 so as to open the storage portion of the torsion bar 93. It is done.

  In the case of the pulling operation, it is difficult to pull out the torsion bar 93 extending in the vehicle width direction from the narrow exposed portion 93c. Further, if the exposed portion 93c is pulled out little by little while fusing, the operation becomes very complicated. Furthermore, if the cover part remains fixed and closed, the work of installing a new torsion bar is similarly complicated. If the interior is forcibly built from the limited space, the load receiving table 91 and the new torsion bar are damaged, and an electrodeposition work or the like is required separately.

On the other hand, when the storage portion is opened in order to make it easy to take out the torsion bar 93, the cover portion 912 is fixed to the storage portion 911 by welding. Therefore, it is necessary to cut off the welded portion. Further, it is difficult to perform such excision work while the load receiving table lifting device 90 is mounted on the vehicle. Before starting the cutting operation, the load receiving device lifting device 90 mounted on the vehicle is removed to remove the torsion bar. When the replacement is completed, the work of fixing the cover 912 to the storage portion 911 by welding again and mounting the load receiving platform lifting device 90 on the vehicle becomes necessary and becomes large.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a load receiving table lifting / lowering device that can easily replace a torsion bar built in a load receiving stand.

In the present invention, the load receiving table that is lifted up and down between the ground and the loading platform and is rotatably supported by the vehicle side support member via the left and right mounting portions, and the vehicle width direction is elongated at the base end portion of the loading platform. And a torsion bar mounted as a direction , wherein the torsional force of the torsion bar urges the rotation of the load receiving table. The torsion bar has an opening along the longitudinal direction .
And it is desirable for the said opening part to be set as the structure provided in the edge part of the vehicle width direction in the receiving stand base end part.

In particular, the base end portion of the load receiving base is surrounded by a storage portion for storing the torsion bar and a cover portion fixed to the storage portion and provided with the opening , and the torsion bar is surrounded along the vehicle width direction. Has a configuration.

The opening can be configured to have the vehicle width direction as a longitudinal direction, and a covering member covering the opening is further provided at the base end of the load receiving platform. It can be set as a structure.

  According to the present invention, at the base end portion of the load receiving platform, the opening is provided at the end in the vehicle width direction, and the opening extends along the torsion bar. The length with which the torsion bar is pulled out through the opening becomes long and remains easy to pull out while being mounted. Moreover, since it becomes easy to insert from an opening part, the cost required for replacement | exchange of a torsion bar can be reduced significantly.

It is a perspective view which shows the cargo receiving stand raising / lowering apparatus which concerns on this embodiment. It is a development perspective view showing arrangement of a torsion bar concerning this embodiment. It is the rear view and top view which show the arrangement | positioning state of the torsion bar which concerns on this embodiment. It is a principal part perspective view which shows the replacement state of the torsion bar which concerns on this embodiment. It is an expansion | deployment perspective view of the receiving stand base end part which concerns on another embodiment. It is the perspective view of the load receiving table raising / lowering apparatus of the conventional structure, and the principal part rear view of a load receiving stand.

  DESCRIPTION OF EMBODIMENTS Embodiments of a load receiving table lifting apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1A shows a load receiving table lifting device 100. The load receiving platform lifting device 100 includes a pair of left and right posts 1 erected at the rear of the vehicle, a slider 2 that is inserted into each post 1 and is movable up and down, and a load receiver that is rotatably supported at the lower end of the slider 2. And a urging means 4 for urging upward rotation of the load receiving table 3 at a portion sandwiched between the pair of sliders 2, and the load receiving table 3 is in a horizontal state as shown in FIG. It is moved up and down between the loading platform 5.

  The load receiving platform 3 is supported by a bracket 2a that is made of an iron member and serves as a vehicle-side support portion. The bracket 2a is a projecting portion of the slider 2 projecting rearward through a slit 1a provided on the rear surface of the post 1, and the load receiving platform 3 is rotatably connected to the bracket 2a via a support shaft 2b. .

  A hydraulic cylinder (not shown) is disposed inside a cross member 6 installed between the pair of posts 1, and a slider 2 is connected to the hydraulic cylinder via a wire 7. One end portion of the wire 7 is fixed to the upper end portions of the left and right sliders 2, guided upward from the slider 2, and folded downward by a sheave 1 c provided on the upper portion of the post 1. The other end of the folded wire 7 is guided downward, and is guided from the lower part of the post 1 to the above-described hydraulic cylinder via a sheave (not shown) and is appropriately fixed. The wire 7 is drawn out to or drawn from the post 1 by the expansion and contraction operation of the hydraulic cylinder, and the slider 2 fixed to the wire 7 is moved up and down.

The loading platform 3 is raised to the height of the loading platform 5 and then rotated upward, and stored in a standing state as shown in FIG. The urging means 4 is provided in a portion of the load receiving table 3 sandwiched between the sliders 2 so that the rotation operation of the load receiving table 3 can be performed smoothly (one-dot chain line portion 3a). Specifically, the sandwiched portion is sandwiched between a pair of left and right support shafts 2b supported by the bracket 2a of the slider 2, and is a portion (hereinafter, referred to as a base end side) when rotating in the load receiving platform 3. This is referred to as “base end”.) 3a.
The configuration of the base end portion 3a including the urging means 4 is as follows.

  As shown in the exploded perspective view of the main part of FIG. 2, the base end portion 3 a includes a storage portion 31 having a U-shaped cross section that is convex in the vehicle front side (X direction) with the vehicle width direction (Y direction) as the longitudinal direction. Two torsion bars 41 a and 41 b are arranged in the storage portion 31 and have a cover portion 32 that closes the storage portion 31 on the vehicle rear side, and a covering member 33 that covers the cover portion 32 so as to overlap. . The biasing means 4 includes the above-described two torsion bars 41a and 41b, fixing holders 42a and 42b for fixing one end portions 411a and 411b of the torsion bars 41a and 41b, and the other end portions of the torsion bars 41a and 41b. And support holders 43a and 43b for supporting 412a and 412b.

  The torsion bars 41a and 41b have a shape extending in the Y direction, and each end is bent in a direction substantially perpendicular to the extending direction (Z direction in the drawing). As shown in the figure, the torsion bars 41a and 41b are arranged in the storage portion 31, and the one end portions 411a and 411b are respectively inserted into the fixed holders 42a and 42b having a square cross section. The load receiving platform 3 has concave portions on both sides of the base end portion 3a. The recess functions as mounting portions 20A and 20B when the load receiving platform 3 is mounted on a vehicle. The fixed holders 42a and 42b are It is fixed in this recess. Engagement brackets 301 and 302 extending downward and connected to the slider 2 (bracket 2a) are provided at the outermost edge portion constituting the concave shape. The bracket 2a of the slider 2 is provided with two engaging pieces 21a and 22a facing each other, and the engaging brackets 301 and 302 of the load receiving base 3 are arranged between the two engaging pieces 21a and 22a. The For the sake of convenience, only the slider 2 and its engagement pieces 21a, 22a that are connected to one engagement bracket 302 of the load receiving tray 3 are shown, but the other engagement bracket 301 is also arranged in the same manner. Is done.

  The engagement bracket 302 of the load receiving platform 3 and the engagement piece (outer engagement piece) 21a located outside thereof are connected and supported by a support shaft (not shown) inserted in the Y direction. 2 (engagement piece 21a) is supported rotatably. Further, a fixing holder 42b for fixing one end 411b of the torsion bar 41b is fixed to an engagement piece (inner engagement piece) 22a located on the inner side of the load receiving tray 3 by welding. Thereby, even if the goods receiving stand 3 rotates, the fixed holder 42b does not rotate but maintains a fixed posture. One end portion 411b of the torsion bar 41b is inserted into the fixed holder 42b, and the other end portion 412b is inserted into the support holder 43b provided in the storage portion 31 of the cargo receiver 3. In this state, a bolt (not shown) is screwed into a bolt hole 421b provided in the fixed holder 42b, and the one end 411b is fixedly supported. Therefore, even if the load receiving platform 3 is pivoted downward, the one end 411b of the torsion bar 41b remains fixed in a posture facing upward. On the other hand, since the other end portion 412b is not fixed, the other end portion 412b is also rotated along with the rotation of the load receiving platform 3. As a result, a torsional force is generated in the torsion bar 41b, and this torsional force functions as an upward biasing force for the load receiving platform 3. The remaining one torsion bar 41a is also arranged in the same manner, and is configured to generate a biasing force in the same manner.

  The cover part 32 is welded and fixed to the storage part 31 in which the torsion bars 41a and 41b are arranged. By being welded, the entire load receiving tray 3 ensures a desired strength. The cover part 32 is a metal member having an L-shaped cross section with the Y direction as the longitudinal direction. With such a configuration, the torsion bars 41a and 41b are surrounded by the storage portion 31 and the cover portion 32 along the Y direction in the portion sandwiched between the attachment portions 20A and 20B with respect to the vehicle in the base end portion 3a. Thus, the portion exposed to the outside is greatly limited, and good appearance quality can be obtained. Further, on the vehicle rear surface side of the cover portion 32, openings 32a and 32b having the Y direction as a longitudinal direction are provided at both ends. A pair of left and right holes 321a and 321b are also provided between the pair of left and right openings 32a and 32b.

  The covering member 33 has a lower end 33a bent in the X direction, and a tongue 33b provided on the upper side is also bent in the X direction. The covering member 33 is locked to the storage portion 31 using a bolt or the like at the tongue portion 33b or the lower end portion 33a, and the main surface portion 33c excluding the lower end portion 33a and the tongue portion 33b is located behind the cover portion 32. The openings 32a and 32b and the holes 321a and 321b are closed. The covering member 33 is formed of a resin member, and an increase in vehicle weight is suppressed. However, the covering member 33 may be configured to have a high strength of the load receiving platform 3 using a metal member.

  The torsion bars 41a and 41b are arranged in the state shown in FIG. FIG. 3A shows a rear view in which the covering member 33 is removed, and FIG. 3B shows an AA cross-sectional view of FIG.

As shown to Fig.3 (a), each of the torsion bars 41a and 41b is distribute | arranged so that it may face outward from the opening parts 32a and 32b and the hole parts 321a and 321b. The openings 32a and 32b each have a length of about a quarter from the end of the cover part 32 in the vehicle width direction, but at the outermost end, an edge adjacent to the openings 32a and 32b. Parts 320a and 320b are provided. By preventing both ends of the cover part 32 from opening in the vehicle width direction, the cover part 32 can maintain a predetermined strength. The holes 321a and 321b are provided in the vicinity of the arrangement positions of the support holders 43a and 43b. The openings 32 a and 32 b and the holes 321 a and 321 b are provided in a size and a position so that the cover 32 has a desired strength for functioning as a part of the cargo receiver 3. The openings 32a and 32b and the holes 321a and 321b are all provided in a pair of left and right configurations, but may be configured such that at least one of them is provided. The holes 321a and 321b are provided between the support holders 43a and 43b and the openings 32a and 32b. However, the holes 321a and 321b may be provided between the pair of support holders 43a and 43b.

  The torsion bars 41a and 41b are fixed at one end in the fixed holders 42a and 42b, respectively, and are located at substantially the same height. When viewed from above, as shown in FIG. 3B, the other end of one torsion bar 41 a is housed in a support holder 43 a provided in the cover portion 32. Since the other torsion bar 41b is housed in a support holder 43b provided in the housing part 31, the other end part is arranged so as to overlap with the one torsion bar 43b in the vehicle front-rear direction at a substantially central part.

When exchanging the torsion bars 41a and 41b, the torsion bar 41a is pulled out from the opening 32a as shown in the perspective view of the main part of FIG. FIG. 4A shows only the load receiving platform 3 for the sake of convenience, but this drawing operation is performed in a state where the load receiving platform 3 is mounted on the vehicle. When performing this extraction, the covering member 33 is removed from the cover portion 32 in advance. At this time, since the covering member 33 is only attached to the storage portion 31 via a bolt, the covering member 33 can be easily removed simply by removing the bolt. After removing the covering member 33, the other end portion 412a (see FIG. 3A) of the torsion bar 41a and the one end portion 411a are removed from the support holder 43a (see FIG. 3A). At this time, since the torsion bars 41a and 41b can be visually observed from the opening 32a or the hole 321a provided in the cover part 32, an operator can insert a finger from at least one of these to grasp and remove the torsion bar 41a. . In particular, since the hole 321a is provided in the vicinity of the support holder 43a, the operation of removing the other end 412a from the support holder 43a can be easily performed. Next, one end 411a of the torsion bar 41a is pulled out from the opening 32a, and the torsion bar 41a is pulled out in the direction of the arrow shown in the drawing. Since the opening 32a has the vehicle width direction as the longitudinal direction, the torsion bar 41a can be easily pulled out. In the present embodiment, the opening 32a has a shape having a vertical surface 322t cut out in a direction perpendicular to the surface direction of the main surface 321t of the cover portion 32 as shown in FIG. 4B. However, as shown in FIG. 4C, at least the central side end portion 320c in the vehicle width direction is cut out in a direction inclined with respect to the main surface direction of the cover portion 32, specifically, the center The side end portion 320c may have a shape having a tapered surface 320t in which the opening area is enlarged as it goes inwardly in which the torsion bar 41a is accommodated. Providing the tapered surface 320t makes it difficult for the torsion bar 41a to be caught by the cover part 32 when the torsion bar 41a is pulled out from the opening 32a. Moreover, even when it catches, the frictional force which arises in the cover part 32 becomes small, and the extraction operation | work of the torsion bar 41a becomes easy. As described above, the torsion bars 41a and 41b can be pulled out and inserted in a state in which the load receiving platform 3 is mounted on the vehicle, so that the operation cost can be greatly suppressed. If the cradle 3 mounted on the vehicle is to be removed from the vehicle, it is essential to move it to a place where it can be removed, but the torsion bars 41a and 41b can be easily replaced as in this embodiment. If possible, it is preferable because the restriction of the replacement work place is suppressed.

  By the way, with respect to the storage part 31, the cover part 32 provided with the openings 32a and 32b is fixed to the rear side of the vehicle, but the cover part 82 is attached to the storage part 310 as shown in FIG. It can also be set as the structure fixed. At this time, each of the storage portion 310 and the cover portion 82 has an L-shaped cross section, and the vehicle width direction of the portion (lower portion) 821 that is on the vehicle lower side when the load receiving stand 3 is upright Openings 82a and 82b are provided at both ends. Since the opening portions 82a and 82b have the longitudinal direction in the vehicle width direction like the opening portions 32a and 32b of the cover portion 32a, the torsion bar can be easily formed from the vehicle lower side of the base end portion 3a of the load receiving platform 3. 41a and 41b can be pulled out. Moreover, since the opening parts 82a and 82b are provided in the lower part 821, and the opening parts 82a and 82b cannot be visually recognized from the rear in a state where the cargo receiving stand 3 stands, the configuration in which the covering member 33 is not disposed may be adopted. I do not care. In this case, the vehicle weight can be reduced and the member cost can be reduced by the amount that the covering member 33 is not provided. When the openings 82a and 82b are provided in the lower portion, the openings 82a and 82b face the front of the vehicle when the load receiving table 3 is in a horizontal state and a load or the like is loaded on the load receiving table 3. Therefore, since the openings 82a and 82b are not directly grounded, the structure is such that dust or the like is difficult to enter from the openings 82a and 82b. Although the lower portion 821 has only the openings 82a and 82b, at least one hole may be provided in the vicinity of the support holders 43a and 43b in the same manner as the cover portion 32 described above. Moreover, regarding the formation position of a hole, it is not limited to a lower part, You may provide in the vehicle rear surface part 822. FIG.

  As described above, the openings 32a, 32b, 82a, and 82b are provided at the ends of the cover portions 32 and 82, but the position and size of the openings are not limited to this. For example, the torsion bar 41a is provided at the end near the fixed holder 42a so that the one end 411a can be pulled out from the opening 32a (see FIG. 3A), but the opening is near the center. The other end portion 412a can be pulled out from the opening portion. At this time, an opening for pulling out the other end portion 412b of the other torsion bar 41b can also be provided, and two openings can be provided in the base end portion 3a of the load receiving platform 3, but between the support holders 43a and 43b. A single opening may be provided. Even if it is one opening part, both the two torsion bars 41a and 41b can be pulled out by providing in the approximate center part of the base end part 3a.

  In addition, the openings 82a and 82b are configured to be provided in the cover 82. However, the load receiving base 3 is in a standing state and has a lower member in a lower portion of the storage unit 310, and the lower member is directly opened. It is good also as a structure which provides a part. That is, even if the opening 310 is provided in the storage portion 310, the load receiving platform 3 having a configuration in which the torsion bars 41a and 41b to be installed can be easily pulled out may be used.

  Regarding the torsion bars 41a and 41b, only one of the two torsion bars 41a and 41b may be provided. At this time, if both ends are arranged on the mounting portions 20A and 20B and both ends are fixed, a torsional force is generated in the torsion bar, and the rotation of the load receiving platform 3 can be urged.

  In the above-described embodiment, the description has been given using the load receiving platform lifting device 100 that moves up and down with the slider 2 in the pair of left and right posts 1 at the rear end of the vehicle. However, the load receiving platform 3 supports the support portions that support both ends. As long as the torsion bar is configured to be rotatable between the support portions, the configuration can be applied to other configurations, for example, a load receiving platform lifting device in which the load receiving platform is lifted and lowered by a parallel link arm. Further, regarding the rotation direction in which the torsion bar is urged, not only upward rotation but also downward rotation is applicable.

  INDUSTRIAL APPLICABILITY The present invention is useful for a load receiving platform lifting apparatus having a load receiving platform that has a torsion bar and is rotated between a horizontal posture and a standing posture to change the posture.

DESCRIPTION OF SYMBOLS 1 Post 2 Slider 3 Load receiving base 4 Energizing means 5 Loading base 6 Cross member 21a, 22a Engagement bracket 31 Storage part 32 Cover part 32a, 32b Opening part 33 Cover member 41a, 41b Torsion bar 42a, 42b Fixed holder 43a, 43b Support holder

Claims (5)

A load receiving table that moves up and down between the ground and the loading platform and is rotatably supported by a vehicle-side support member via left and right mounting portions, and a vehicle width direction as a longitudinal direction at the base end portion of the loading platform. A torsion bar, and a torsion bar lifting device that is biased by the torsional force of the torsion bar,
Between the mounting portion of the receiving platform of the base end portion, at a portion thereof, that the openings along the longitudinal direction of said torsion bar is provided in the state comprising surrounding the torsion bar A cargo receiving platform lifting device. The said opening part is provided in the edge part of the vehicle width direction in the said base end part. The load receiving stand raising / lowering apparatus of Claim 1 characterized by the above-mentioned. A base end portion of the load receiving platform is a storage portion that stores the torsion bar and a cover portion that is fixed to the storage portion and provided with the opening, and the torsion bar surrounds the vehicle width direction. have a configuration that is,
3. The load receiving platform lifting apparatus according to claim 1 , wherein the opening is provided at the base end in the enclosed state . 4. 4. The load receiving platform lifting apparatus according to claim 1, wherein a length of the opening in the vehicle width direction is shorter than the torsion bar . The load receiving platform lifting / lowering device according to any one of claims 1 to 4, wherein a covering member that covers the opening is further provided at a base end portion of the load receiving stand.

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