JP2003112558A - Loading deck elevating device for cargo vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily avoid interference between a compression arm and a vehicle even if a loading deck elevating device fitted to a large-sized cargo vehicle is to be applied to a small-sized cargo vehicle and to use a supported part on the deck side (mounting frame) for a tip end arm of a lift arm both for the large-sized and the small-sized cargo vehicles. SOLUTION: A base of the tip end arm 2 in the lift arm 4 is integrally joined to the inside face of an outer base arm half 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading platform elevating device for a cargo handling vehicle, and more particularly, a pair of elevating frames which are arranged in parallel with each other and pivotally support the loading platform so that the loading platform can be rotated up and down. It is supported by the mechanism so that it can be raised and lowered.
Each of the lifting link mechanisms includes a compression arm and a lift arm adjacent to the inside of the compression arm, the lift arms including inner and outer base arm halves extending in parallel at a distance from each other. A base arm having a base end rotatably rotatably supported on the vehicle body, and a plate-like arm fixed to the tip of the base arm and rotatably rotatably rotatably supporting the elevating frame and the load receiving pedestal at its tip end. An operating end of an elevating cylinder composed of a front arm and forcibly raising and lowering each lift arm is disposed between the inner and outer base arm halves and is pivotable to both of the base arm halves. The present invention relates to a load-bearing platform lifting device for a cargo-handling vehicle that is axially supported.

[0002]

2. Description of the Related Art A loading platform elevating device having the above structure is known, in which the base arm is divided into inner and outer base arm halves so that the working end of the elevating cylinder can be supported at both ends. It is able to support the shaft stably and firmly.

On the other hand, since the front arm is formed in the shape of a plate, the width of the pivotally supported portion on the side of the load receiving side with respect to the front arm can be reduced, so that the design of the peripheral portion of the front side arm of the load receiving level can be reduced accordingly. Has a higher degree of freedom, and a notch is provided on the outer surface of the base end of the load receiving base corresponding to the front arm (see Ta in FIG. 2).
Even in the case of forming ridges, there is an advantage that the width can be reduced so that it is difficult to get caught by other objects.

Thus, in the conventional device, for example, as shown in FIG. 10, the base of the plate-like front arm 07 is provided on the outer surface of the outer base arm half body 06o (that is, the surface facing the compression arm 03). It is integrally joined, and this front arm 07
The compression arm 03 is arranged adjacent to the outer side of the.

[0005]

By the way, in the prior art, when the loading platform elevating device adapted to a large cargo handling vehicle is applied to a small cargo handling vehicle as it is, the taillight position of the small cargo handling vehicle is relatively small. Because it's inside
There is a risk that the compression arm may interfere with the taillight at the rear of the vehicle when the load receiving platform (elevating frame) is moved up and down, which may cause the inconvenience of using the standard low-priced taillight.

Therefore, in order to avoid such an inconvenience, for example, as shown by a chain line in FIG. 10, the front arm 07 'is connected to the inner surface of the inner base arm half body 06i (that is, the compression arm 03).
It is conceivable that the compression arm can be arranged inward by the amount corresponding to the mounting space of the conventional front arm by joining the compression arm to the inner side surface). However, in this case, since the mounting position of the front arm 07 'largely moves inward beyond the entire width of the base arm 06, the load-bearing-side supported portion of the front arm (that is, the supported portion is formed). As a result, the position of the mounting frame 09) mounted on the base of the load receiving base is largely displaced, and therefore, two types of shaft-supported parts (mounting frames) having different mounting positions and mounting structures to the load receiving base are manufactured separately. Then, it becomes necessary to use them separately for large vehicles and small vehicles, which increases costs and complicates parts management.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a cargo cradle lifting device for a cargo handling vehicle which can solve the above problems of the conventional device.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 is such that a pair of elevating frames which are arranged in parallel at a distance from each other and pivotally support a load-bearing table so as to be capable of undulating and turning are paired with a vehicle body. Are vertically rotatably supported by the lifting and lowering link mechanisms, and each of the lifting and lowering link mechanisms includes a compression arm and a lift arm adjacent to the inside of the compression arm, and the lift arms are spaced apart from each other. A base arm having an inner base arm half body and an outer base arm half body that extend in parallel with each other and a base end of which is rotatably supported by the vehicle body; and the elevating frame fixed to the front end of the base arm. An operating end of an elevating cylinder, which is composed of a plate-shaped front arm that pivotally supports the load-receiving pedestal at its front end, and forcibly rotates each lift arm up and down, has the inner and outer base arm halves. Both base arms are half-placed between In receiving platform lifting device for a cargo handling vehicle which is pivotally supported on the base of the tip portion arm is characterized in that it is integrally bonded to the inner surface of the outer base arm halves.

According to this feature, the mounting position of the front arm is slightly moved from the outer side surface of the outer base arm half body to the inner side surface thereof, and the mounting position of the compression arm is equal to the plate thickness of the front arm. Since it can only be moved to the inner side (lift arm side), the extension of the lifting link mechanism to the outside can be suppressed accordingly. Therefore, the load receiving platform lifting device suitable for a large cargo handling vehicle can be directly used for a small cargo handling vehicle. Even if it is applied, it is possible to easily avoid the interference between the compression arm and the vehicle side, and moreover, the position of the pedestal-supported portion on the side of the load receiving side with respect to the front arm hardly deviates from the conventional one. The mounting frame of the same structure and size, which is attached to the base of the load receiving base to form the pivoted portion, can be commonly used for the load receiving base of large and small cargo handling vehicles, resulting in cost reduction.

According to the invention of claim 2, in addition to the features of the invention of claim 1, the front arm is joined to the inner surface of the outer base arm half body at a position corresponding to the working end of the lifting cylinder. And a cylinder boss integrally formed therewith, which functions as a support boss for fittingly supporting the pivot supporting the working end of the lifting cylinder in cooperation with the outer base arm half. According to this feature, since the front arm itself is also used as the support boss for the lifting cylinder, the number of parts can be reduced and the manufacturing cost can be reduced.

Further, in addition to the features of the invention of claim 1 or 2, the invention of claim 3 is a tailgate in which the cargo cradle is arranged at a rear portion of a vehicle body and is used for unloading luggage from the rear of the vehicle body. The taillight is disposed outside the compression arm in the raised position at the rear part of the vehicle body. According to this feature, the extension of the lifting link mechanism to the outside in the vehicle width direction is suppressed. Therefore, even if the loading platform elevating device suitable for a large-sized cargo handling vehicle is applied to a small-sized cargo handling vehicle as it is, the compression arm and the rear part of the vehicle (especially the taillight of a small-sized vehicle that is located closer to the inside than a large-sized vehicle) It is possible to easily avoid the interference with, and it is possible to use the standard form of an inexpensive taillight.

Further, in addition to the features of the invention of claims 1, 2 or 3, the invention of claim 4 further comprises a mounting frame serving as a pivotally supported part for the front arm and the elevating frame at the base of the load receiving base. It is characterized in that the front arm and the elevating frame are rotatably connected to the mounting frame via a common pivot, and according to this feature, the cargo cradle can be stably stabilized with a relatively simple structure. Can be supported.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

In the accompanying drawings, FIG. 1 is an overall side view of a cargo handling vehicle according to an embodiment of the present invention, and FIG.
2 is an enlarged cross-sectional view, FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2, and FIG. 4 is an enlarged view of an essential part schematically showing the relationship between the elevating frame and the load receiving base when the load receiving base is in the horizontally extended position (Fig. 3 is an enlarged view of a portion indicated by an arrow 4 in 3), and FIG. 5 is an enlarged view of a main part schematically showing the relationship between the lifting frame and the load receiving base when the load receiving base is in the standing storage position. Partial enlarged sectional view (enlarged sectional view taken along line 6-6 of FIG. 2), FIG. 7 is a view taken along arrow 7 of FIG. 6, and FIG. 8 is a rear view of a main portion of a vehicle rear end portion (view taken along arrow 8 of FIG. 3). 9 is a sectional view taken along line 9-9 of FIG.

1 to 3, a body B of a small cargo handling vehicle is provided with a body frame F and a luggage box 1 mounted on the body frame F and capable of accommodating luggage. The rear end opening of the box 1 is opened and closed by a door (not shown) provided there.

At the rear part of the vehicle body B, there is provided a so-called tailgate lifter, which is a loading platform raising / lowering device. That is, a pair of left and right elevating frames 2 are supported at the rear of the body frame F through a pair of left and right elevating link mechanisms L so that they can be elevated and lowered while maintaining a constant posture (vertical posture in the illustrated example). Between the link mechanism L and the vehicle body frame F, a lifting hydraulic cylinder C1 as a lifting cylinder that drives the lifting frame 2 to lift is provided.

Further, on each of the left and right elevating frames 2, a rectangular plate-shaped load receiving base T is provided so that it can be erected and swung between an inclined protruding position H'which is inclined downward with respect to a horizontal plane and a vertical storage position V. A tilting hydraulic cylinder C2 for forcibly undulating and rotating the load receiving table T is interposed between the load receiving table T and the elevating frame 2.

Between each of the elevating frames 2 and the load receiving tray T, the load receiving tray T is rotated when the load receiving tray T is rotated downward from the storage position V.
There is provided a conventionally known movable stopper mechanism S which can optionally take a first operation mode for stopping the horizontal extension position H and a second operation mode for stopping the load receiving tray T at the inclined extension position H '. It is provided.

Each elevating link mechanism L comprises a support bracket FB fixed to the rear portion of the vehicle body frame F, and a straight strip-shaped plate member having a base end swingably supported at 3p on the lower portion of the bracket FB. A compression arm 3, a lift arm 4 whose base end is pivotally supported on the upper portion of the bracket FB so as to be vertically swingable, and a tip end of each of the arms 3 and 4 is pivotally movable to a lower portion and an upper portion. It is configured as a parallel link including the lifting frame 2 supported by the supports 5d and 5u, and the lift arm 4 and the vehicle body frame F (support bracket FB in the illustrated example).
Both ends of a lifting hydraulic cylinder C1 are rotatably connected to each other via pivots P1 and P2.

Referring also to FIGS. 4 to 9, the lift arm 4 has an inner base arm half body 6i and an outer base arm half body 6o which extend in parallel at a distance from each other and are provided with a body frame F. A base arm 6 whose base end is pivotally supported 4p, and an enormous front end of the base arm 6 (in particular, an outer base arm half 6).
It is composed of a plate-shaped front arm 7 having a base joined to the inner surface of o) by a fixing means such as welding. The tip arm 7
Of the base arm 6 is overhanging from the tip 7a
Is formed in a hook shape that smoothly curves and rises rearward, and its tip portion 7a is relatively rotatable via a pivot 5u common to the upper portion of the elevating frame 2 and the base portion of the load carrier T. Connected to.

The inner and outer base arm halves 6i, 6o are integrally connected to each other via at least one connecting plate 8, 8 '. Also, the inner and outer base arm halves 6
i and 6o are hydraulic cylinders C for raising and lowering arranged between them.
One working end is rotatably connected and supported via the pivot P1.

The front arm 7 has an intermediate portion integrally projecting downward, and the projecting portion constitutes the cylinder supporting portion 7b of the present invention.
1 functions as a support boss for the working end. That is, the cylinder support portion 7b is joined to the inner side surface of the outer base arm half body 6o at a position corresponding to the operating end of the lifting hydraulic cylinder C1, and the cylinder support portion 7b and the outer base arm half body 6o are connected to each other. One end of a pivot P1 that supports the working end of the cylinder C1 is fitted and supported in the first support hole h1 formed in the above. The other end of the pivot P1 is fitted and supported in a second support hole h2 formed in the inner base arm half body 6i and the support boss portion 6ib integrally joined to the inner side surface of the half body 6i. It

The front end side of the front arm 7 is thicker than the support boss 7b and is thicker than the base side.
Part of t is joined to the outer base arm half 6o. Both ends of the cross member 10 made of a pipe material are integrally connected between the bases of the thick portions 7t of the left and right front arms 7, whereby the left and right lift arms 4 are reliably synchronized. A bearing hole 7h for fitting and supporting the pivot 5u of the load receiving tray T is formed at the tip of the thick portion 7t.
Further, a cutout portion Ta for escaping the front arm 7 is formed in the front plate base portion of the cargo receiving table T.

A mounting frame 9 forming a pivotally supported portion for the front arm 7 and the elevating frame 2 is mounted on the base of the load receiving table T. The mounting frame 9 includes a substrate 9m to be welded to the base end of the cargo receiving table T, and a plurality of support plates 9a, 9b, which are integrally projected on the outer surface of the substrate 9m with a gap and are arranged in parallel with each other.
9c. The central support plate 9b and the inner support plate 9a are arranged so as to sandwich the thick front end portion 7a of the front arm 9, and the central support plate 9b and the outer support plate 9c are the lifting frame. The support shafts 9a, 9b, and 9c are supported by the support shafts 9a, 9b, and 9c so that the pivot shaft 5u of the load carrier T penetrates in a skewered manner.

The central support plate 9b and the outer support plate 9c
A stopper block 12 that engages with the elevating frame 2 when the load receiving tray T is in the horizontal overhang position H is pivotally supported between the and, and the stopper block 12 and its rotational position are arbitrarily switched. The movable stopper mechanism S is constituted by the operable selection operation mechanism 13.

Each elevating frame 2 is composed of a pair of left and right side plates 2s, 2s lined up at intervals, and a connecting tube 2p for integrally connecting the upper parts of both side plates 2s, 2s. The pivot 5u of the load receiving tray T is rotatably supported through the inner circumference of 2p. Between the lower parts of the left and right side plates 2s, 2s, the tip of the compression arm 3 is rotatably supported via a pivot 5d, and this pivot 5d is used for grounding the load carrier T when it is grounded. The buffer roller R that comes into contact with the ground in advance is rotatably supported, and the outer peripheral portion of the roller R protrudes beyond the lower end edges of the left and right side plates 2s, 2s.

The base end of the tilt hydraulic cylinder C ₂ is rotatably connected between the upper and lower intermediate portions of the left and right side plates 2s, 2s via a pivot 5m. Further, a stopper plate 14 that can engage with the stopper block 12 is integrally installed between the lower portions of the rear side edges of the left and right side plates 2s, 2s.

Further, at the rear end of the vehicle body B, as shown in FIG. 8, a pair of left and right taillights TL are provided outside the left and right link mechanisms L (compression arms 3) and near the turning locus of the arms 3. It is arranged.

Next, the operation of the above embodiment will be described. Now
The cargo tray T is in the vertical storage position V, and the movable stopper mechanism S is set to the first operation mode (that is, the stopper block 12).
Is held at the position shown by the solid line in FIG. 4), when the tilting hydraulic cylinder C2 is contracted, the loading platform T can be rotated downward from the vertical storage position V to the horizontal overhang position H (FIG. 3 solid line). Next, the lifting hydraulic cylinder C1
The contraction / extension of the load carrier T allows the load carrier T to be lowered / raised in a horizontal overhanging position. It is possible to perform the lifting work of the luggage, that is, the carrying-in / carrying-out work of the luggage 1. The movable stopper mechanism S is set to the second operation mode (that is, the stopper block 12 is at the position shown by the chain line in FIG. 4).
When the tilting hydraulic cylinder C2 is contracted while being held at, the load carrier T can be rotated downward to the tilted extended position H '(that is, until the tip of the load carrier T is grounded).

By the way, in the present embodiment, the lift arm 4 in the lifting link mechanism L for guiding and supporting the lifting and lowering of the load receiving tray T.
In, the base portion of the tip arm 7 is integrally joined to the inner side surface of the outer base arm half body 6o of the base arm 6. Therefore, the attachment position of the outermost compression arm 3 in the elevating link mechanism L can be moved toward the inner side (lift arm 4 side) by the plate thickness of the front arm 7, and thus the elevating link mechanism. The protrusion of L to the outside in the vehicle width direction is suppressed.

As a result, even if the loading platform elevating device adapted to a large-sized cargo handling vehicle is applied to a small-sized cargo handling vehicle as it is, the interference between the compression arm 3 and the vehicle rear portion (particularly the taillight TL) can be easily avoided. This makes it possible to use a standard form of an inexpensive tail light. Moreover, the front arm 7
Since the position of the pivotally supported portion on the side of the load receiving base T does not substantially deviate from that of the conventional example illustrated in FIG. 10, the mounting frame 9 of the same structure mounted on the base of the load bearing base T to form the supported shaft portion.
Can be commonly used for the cargo receiving tray T of large and small cargo handling vehicles, resulting in cost reduction and easy parts management.

Further, in this embodiment, since the front arm 7 (particularly the cylinder support portion 7b) is also used as the support boss for the lifting hydraulic cylinder C1, the outer base arm half 6 is formed.
o It is not necessary to provide a dedicated support boss on the inner surface, so that the number of parts can be reduced and the manufacturing cost can be reduced.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments are possible within the scope of the present invention.

[0034]

As described above, according to the invention of claim 1,
Since the base part of the front arm is integrally joined to the inner surface of the outer base arm half body, the mounting position of the compression arm may be moved inward by the plate thickness of the front arm (lift arm side). Therefore, it is possible to suppress the extension of the lifting link mechanism to the outside, and therefore, even when the loading platform lifting device suitable for a large-sized cargo handling vehicle is directly applied to a small-sized cargo handling vehicle, the compression arm and the vehicle are It is possible to easily avoid the interference with the side, and since the position of the pedestal side of the load receiving side with respect to the front arm does not shift much compared to the conventional one, it is mounted on the load receiving base to form the rotatably supported part. The mounting frame with the same structure can be used in common for the cradle of large and small cargo handling vehicles, which reduces costs and facilitates parts management.

According to the second aspect of the invention, the front arm is also used as the support boss for the lifting cylinder, so that the number of parts can be reduced and the manufacturing cost can be reduced.

Further, according to the third aspect of the present invention, it is possible to prevent the lifting link mechanism from projecting outward in the vehicle width direction. Therefore, the loading platform lifting device suitable for a large loading vehicle can be used as it is for a small loading vehicle. Even if it is applied to, it is possible to easily avoid the interference between the compression arm and the rear part of the vehicle, especially the taillight, and it is possible to use the standard form of the low-priced taillight.

Further, according to the invention of claim 4, a mounting frame serving as a shaft-supported portion for the front arm and the elevating frame is mounted on the base of the load receiving table, and the front arm and the elevating frame are attached to the mounting frame. Since the frame is rotatably connected via the common pivot, the load receiving platform can be stably supported with a relatively simple structure.

[Brief description of drawings]

FIG. 1 is an overall side view of a cargo handling vehicle according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is a view on arrow 3 of FIG.

FIG. 4 is an enlarged view of a main part schematically showing the relationship between the lifting frame and the load receiving base when the load receiving base is in a horizontally extended position (an enlarged view of an arrow 4 in FIG. 3).

FIG. 5 is an enlarged view of an essential part schematically showing the relationship between the lifting frame and the load receiving base when the load receiving base is in the standing storage position.

FIG. 6 is an enlarged sectional view of a main part of a lift arm (6-6 in FIG. 2).
(Enlarged sectional view)

FIG. 7 is a view on arrow 7 of FIG.

FIG. 8 is a rear view of the main part of the rear end of the vehicle (a view from the arrow 8 in FIG. 3).

9 is a sectional view taken along line 9-9 of FIG.

FIG. 10 is a diagram corresponding to FIG. 9 showing a conventional example.

[Explanation of symbols]

B ... Body C1 ...... Lifting hydraulic cylinder L ... ・ Lift link mechanism P1 Axis T ··· Receiving stand TL: tail light 2 ・ ・ Elevating frame 3 ... Compression arm 4 ・ ・ Lift arm 4p: Shaft support 5u ... Axis (axis support) 6i ... Inside base arm half 6o ...... Outer base arm half 6 ... Base arm 7 ... Front arm 7b ... Cylinder support 9 ... Mounting frame

Claims (4)

[Claims] 1. A receiving tray (T) arranged in parallel at a distance from each other.
A pair of elevating frames (2) rotatably and rotatably supported by the vehicle body (B) are rotatably supported by a vehicle body (B) via a pair of elevating link mechanisms (L). )
Comprises a compression arm (3) and a lift arm (4) adjacent to the inside of the compression arm (3), the lift arm (4) being spaced apart from each other and extending in parallel to each other. A base arm (6) having a body (6i) and an outer base arm half body (6o) and a base end of which is pivotally supported (4p) on the vehicle body (B), and a base arm (6) of the base arm (6). Each lift arm (4) is composed of a plate-shaped front arm (7) fixed to the front portion and pivotably supporting (5u) the lifting frame (2) and the load receiving tray (T) at the front end. ) Of the lifting cylinder (C1) for forcibly lifting and lowering the) is disposed between the inner and outer base arm halves (6i, 6o) and is rotated to both base arm halves (6i, 6o). In a lifting platform for a cargo handling vehicle, which is movably supported, a base portion of the front arm (7). Wherein characterized in that it is integrally bonded to the inner surface of the outer base arm halves (6o), receiving platform lifting device for a cargo handling vehicle. 2. The cylinder support portion (7b) joined to the inner surface of the outer base arm half body (6o) at a position corresponding to the working end of the lifting cylinder (C1). The cylinder support (7
b) is characterized in that it functions as a support boss for fittingly supporting the pivot (P1) supporting the working end of the lifting cylinder (C1) in cooperation with the outer base arm half (6o). The loading platform lifting device for a cargo handling vehicle according to claim 1. 3. The luggage carrier (T) is a tailgate that is provided at the rear of the vehicle body (B) and is used for loading and unloading luggage from the rear of the vehicle body (B). 3. The cargo cradle lifting device for a cargo handling vehicle according to claim 1, wherein a tail light (TL) is arranged outside the compression arm (3) in a raised position. 4. A mounting frame (9) serving as a pivotally supported part for the front arm (7) and the elevating frame (2) is mounted on the base of the load receiving table (T), and the mounting frame (9). 4. The cargo handling vehicle according to claim 1, wherein the front arm (7) and the lifting frame (2) are rotatably connected to each other via a common pivot (5u). Lifting device for the receiving tray.