JP4248361B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving table lifting device mounted on a truck and used for loading and unloading loads.

  In order to mount the loading platform lifting device on the body of a lorry, the horizontal loading platform is lifted to form the same surface as the floor surface of the packing box, and for the mounting provided on the lifting device side. The bracket is temporarily fixed to the chassis frame of the vehicle body using bolts, nuts, etc., and then the bodywork bracket is welded to the vehicle body. Thereby, the load receiving platform lifting device is fixed to the vehicle body.

  At the time of the above temporary fixing, it is necessary to position and adjust the horizontally developed load receiving table in the front and rear, left and right, and up and down directions. For front / rear and left / right positioning adjustments, at the connection point between the bodywork bracket and the member that becomes the support base of the lifting device, one side is provided with a long hole extending in the front / rear direction, and the other is provided with a long hole extending in the left / right direction. Can be fastened with bolts, nuts or the like so as to be orthogonal to each other, and positioning adjustment can be performed within the range of the long hole (for example, see Patent Document 1). As for the vertical direction, each of the upper arm (the arm to which the driving force of the hydraulic cylinder is directly applied) out of a pair of left and right arms (upper arm and lower arm) that constitutes a parallel link and moves up and down is provided. A stopper bolt is attached, and the bolt head is brought into contact with the fixed portion (see, for example, Patent Document 2). And by adjusting the protruding length of the stopper bolt, the rising end position (height) of the load receiving platform is adjusted on the left and right sides, and the load receiving surface is identical to the floor surface (substantially horizontal surface) of the load box (so-called surface). To be one.)

JP 2002-114116 A (FIG. 8) JP 2000-108760 A (page 8, FIG. 7)

  In the conventional load receiving platform lifting device as described above, the load receiving block has the same width as the load box, and there is a correspondingly sufficient distance between the left and right upper arms. However, for example, in the case of a loading platform lifting device that uses a compact loading platform that is half the width of the packing box, it is not possible to secure a sufficient distance between the upper arms, and furthermore, when trying to unify the upper arms The distance is zero. The shorter the distance is, the more difficult it is to adjust the left and right heights of the load receiving surface. When the distance is 0, the height of the load receiving surface can be adjusted in a pinpoint manner, but the left and right heights of the entire load receiving surface cannot be adjusted. . Therefore, it is difficult to ensure “planar identity” of the entire load receiving surface with respect to the floor surface of the packing box.

On the other hand, even if the upper arm is integrated, a pair of lower arms is required on the left and right. Therefore, if stopper bolts are provided on the pair of left and right lower arms respectively so as to contact the fixed portion, the difficulty of ensuring the flatness of the plane is somewhat improved. However, in this case, the lower arm needs to have the same mechanical strength as the upper arm in order to withstand the load when the stopper bolt comes into contact with the fixed portion. Giving the lower arm such mechanical strength directly increases the cost and is not a good idea.
In view of the conventional problems as described above, the present invention provides a flat surface between the floor surface of the cargo box and the cargo receiving surface even when the width of the cargo carrier is narrower than the width of the cargo box and there is only one upper arm stopper. It is an object of the present invention to provide a load receiving table lifting device that can easily ensure the sameness at low cost.

The load receiving platform lifting apparatus of the present invention includes a load receiving stand having a width narrower than the width of the load box, a support base extending in the vehicle width direction, a pair of left and right lower arms rotatably attached to the support base, and the pair A substantially single arm that is disposed between the lower arms and is pivotally attached to the support base, the upper arms constituting parallel links with the pair of lower arms, A lifting device that supports the load receiving table and moves it up and down, a stopper device for the lifting operation of the upper arm, the position at which the lifting operation is stopped can be adjusted, and a pair of left and right provided on the support base is located in the vehicle width direction at a position away from said stopper device, a bodywork bracket attached to the vehicle body, at least one of which taken into the body of the chassis frame The mounting position of the temporarily fixed when attached has a what is adjustable in the vertical direction, characterized in.
In the load receiving platform lifting apparatus configured as described above, by adjusting the stopper device and adjusting the mounting position of the bodywork bracket in the vertical direction while raising the load receiving platform to the rising end by the lifting operation of the upper arm. The left and right heights of the cargo receiving surface can be adjusted.

Moreover, in the said cargo receiving base raising / lowering apparatus, it is preferable that said one mounting bracket is a one where the distance from a stopper apparatus is far in a vehicle width direction among a pair of mounting brackets.
In this case, a sufficient distance between the two locations for adjusting the height of the cargo receiving surface can be ensured. Therefore, the left and right heights of the cargo receiving surface can be easily adjusted.

  According to the load receiving table lifting device of the present invention, the left and right heights of the load receiving surface can be adjusted by adjusting the stopper device and adjusting the mounting position of the mounting bracket in the vertical direction. Therefore, even when the width of the load receiving table is narrower than the width of the packing box and there is only one upper arm stopper device, it is easy to ensure the flatness of the floor surface of the packing box and the load receiving surface. The lifting device can be provided at low cost.

  FIG. 1 is a rear view of a load receiving table lifting apparatus according to an embodiment of the present invention. In the figure, a van-shaped cargo box 2 is mounted on the body 1 of the truck. The cargo box 2 has a flat floor surface 2a, and a double door (double door) door 2b provided at the rear is opened to load and unload the cargo. Each door 2b is provided with a lock bar 2c that can be operated by a take-off operation (not shown).

  The load receiving platform lifting / lowering device 3 is compactly provided in the right half of the load box 2 toward the right door side, and the width W0 of the load receiving stand 301 is about ½ of the width W of the load box. The load receiving platform lifting / lowering device 3 is a type in which the load receiving platform 301 is vertically stowed and stored. When used, the load receiving platform 301 is deployed horizontally and is lifted / lowered by a lifting / lowering device 300 such as an arm or a cylinder described later. The door 2b on the left side can be opened and closed while the cargo receiving stand 301 is stored. A step 4 is attached to the lower left side of the packing box 2, and can be used as a stepping platform by an operator during loading and unloading work.

  Next, with reference to FIG. 2, a detailed description will be given of a unit in which the load receiving platform lifting device 3 (load receiving stand 301 is omitted) and step 4 are attached to a common support base. (A) is a plan view of the unit 100, and (b) is a rear view (viewed from the rear of the vehicle body). In the unit 100, the load receiving platform elevating device 3 is attached to the right side of the square pipe frame 302 serving as a common support base, the pair of step stays 6 is welded to the left side, and the step 4 is attached to the rear end thereof. ing. The step stay 6 is integrated with the frame 302 by welding and is also a part of the support base. The unit 100 is mounted on the chassis frame 1a of the vehicle body by a pair of left and right (different forms) mounting brackets 8 and 9 provided directly or indirectly on the frame 302 (details will be described later).

  FIG. 3 is a side view of the load receiving platform lifting / lowering device 3 (load receiving block 301 is also indicated by a virtual line) as viewed from the direction of arrow III in FIG. FIG. 4 is a perspective view of the lifting apparatus 300 (partially omitted) as viewed from the port side. In FIG. 4 (see also FIG. 2 and FIG. 3), a lower arm 305 is rotatably attached to a pair of left and right support portions 303 welded to the frame 302 via pins 304, respectively. A support link 307 is attached to the support portion 306 welded to the frame 302, and an upper arm 309 is rotatably attached to the support link 307 via a pin 308. The support link 307 is provided to enable the cargo receiving table 301 to be tilted.

  5A and 5B are views showing only the upper arm 309, wherein FIG. 5A is a plan view and FIG. 5B is a side view. The upper arm 309 includes a pair of side plates 310 that are separated from each other by a predetermined distance in the vehicle width direction, a reinforcing portion 311 that connects the tip ends thereof, a connecting pipe 312 that is fixed to the reinforcing portion 311 and the side plate 310, and a connection between them. An arm tip 313 fixed to both the left and right ends of the pipe 312 and a stopper mounting plate 314 fixed between the side plates 310 are provided, and these are integrally fixed (welded or the like) so as to be substantially single as a whole. It constitutes an integral body. As shown in the figure, the upper arm 309 has a form that extends left and right (offset dimension S) on the rotation end side (right side) and is close to the rotation end side of the lower arm 305 (FIG. 4).

  Each side plate 310 is welded so that a short cylindrical boss 310a is embedded therein, and a pin 321 (FIG. 4) is inserted between the bosses 310a. The strength of the part of the side plate 310 is improved by welding the boss 310a, and the mechanical stress from the boss 310a to the arm tip 313 is extremely high due to the integration of the side plate 310 with the reinforcing portion 311 and the connecting pipe 312. Sufficient strength is secured in the large part. A lifting cylinder 322 (FIG. 4) for raising and lowering the load receiving table 301 is disposed by effectively using the space between the pair of side plates 310, and one end (piston side) is pivotally attached to the side plate 310 by a pin 321. . The other end (cylinder side) of the elevating cylinder 322 is pivotally attached to the support link 307. Each arm tip 313 is formed with a hole 313a (FIG. 5) for inserting a pin 315 described later. The pair of left and right side plates 310 arranged along the elevating cylinder 322 also serves as a protective plate for the elevating cylinder 322, and prevents the elevating cylinder 322 from being damaged by hitting an object (for example, a stepping stone).

  Returning to FIG. 3, the left and right pivot ends of the upper arm 309 are connected to one end of the link body 316 via a pin 315. Here, as described above, the rotation end side of the upper arm 309 has a form close to the rotation end side of the lower arm 305, and therefore the length of the pin 315 is made as short as possible. be able to. Since shear stress acts on the pin 315, the shorter one is advantageous in terms of strength. Therefore, the short pin 315 can sufficiently secure the strength of pin connection.

  Further, the rotating end of the lower arm 305 is connected to the other end of the link body 316 via a pin 317. The quadrilateral connecting the four points of the pins 304, 308, 315, and 317 is a parallelogram, whereby the pair of left and right lower arms 305 and the single upper arm 309 have the pins 304 and 308 on the left and right respectively. A parallel link having a fulcrum and pins 317 and 315 as action points is formed. The load receiving platform 301 is pivotally mounted between a vertically stored state and a horizontally deployed state while being supported by the link body 316 with the pin 315 as a rotation center.

  FIG. 6 is a side view of a state in which the cargo receiving platform 301 is horizontally deployed as viewed from the starboard side. After the load receiving stand 301 stored vertically is horizontally expanded (manually) in this way, the door 2b is opened. Thereafter, by retracting the elevating cylinder 322, the upper arm 309 and the lower arm 305 can be rotated downward, and the load receiving table 301 can be lowered. Further, by extending the elevating cylinder 322, the upper arm 309 and the lower arm 305 can be rotated upward, and the load receiving table 301 can be raised. In this way, it is possible to load and unload luggage while raising and lowering the load receiving table 301. Further, when the lifting cylinder 322 (FIG. 4) is further contracted after the tip of the lower arm 305 or the link body 316 has landed, the position of the pin 308 (FIG. 3) is caused by the action of the support link 307 (FIG. 3). Is slightly moved rearward, and the cargo receiving platform 301 can be tilted.

2 and 3, a stopper bolt 318 is attached to the stopper mounting plate 314 of the upper arm 309, and this abuts on the support portion 306 when the upper arm 309 is lifted. That is, the stopper bolt 318 and the support portion 306 constitute a stopper device ST for the upward movement of the upper arm 309. Further, by adjusting the protruding length of the stopper bolt 318, it is possible to adjust the position where the upward movement of the upper arm 309 is stopped. Note that if the upper arm 309 is lifted, the lower arm 305 is also lifted.
A plate 319 is attached to each lower arm 305, and a reinforcing member (pipe) 320 is horizontally attached between the left and right plates 319. The width W1 of step 4 and the width W2 of the reinforcing member 320 are designed such that the value of (W1 + W2) is 60% or more of the vehicle width (= the width W of the cargo box 2). Accordingly, the step 4 and the reinforcing member 320 have a function as a legal bumper. Therefore, it is not necessary to provide a dedicated bumper separately.

  In FIG. 2, the mounting bracket 9 on the left side of the upper arm 309 is welded to the frame 302 (see also FIG. 4). The mounting bracket 9 has a flat plate shape and does not take up space in the vehicle width direction, and contributes to the compactness of the entire cargo receiving platform lifting device 3. Moreover, since it is a simple plate-like member, it can be manufactured at low cost.

  Further, as shown in FIG. 2A, the rear end portion of the chassis frame 1a projects to the middle part of the load receiving table lifting device 3, and it is necessary to avoid interference with the rotating arms 305 and 309. Although the protruding portion is located in a space formed between the proximal end side of the lower arm 305 on the inner side and the proximal end side of the upper arm 309 due to the offset dimension S of the upper arm 309, the load receiving platform is raised and lowered. A device 3 is arranged. Thereby, the whole space can be mounted in a compact manner using the space effectively.

  Moreover, since the load receiving platform elevating device 3 as described above has a single upper arm 309, the number of arms is three. Since the upper arm 309 is a single body, its support structure (support portion 306, support link 307), lift cylinder 322, stopper device ST (stopper mounting plate 314, stopper bolt 318), and other tilt mechanism (support link 307) Etc.), etc., the configuration of each related part is sufficient in one set. Accordingly, the overall structure of the load receiving table lifting / lowering device 3 is simplified as compared with the conventional structure that requires two sets.

  Next, the form and attachment structure of the brackets 8 and 9 will be described in detail with reference to FIGS. 7 and 8 are views of the unit 100 viewed from the starboard side and the port side, respectively. In FIG. 7, long holes 9 a extending in the horizontal direction are formed in the mounting bracket 9 at four locations. The chassis frame 1a has a round hole 1b corresponding to the long hole 9a. The mounting bracket 9 is temporarily fixed to the chassis frame 1a with bolts, nuts or the like (not shown) with the long hole 9a and the round hole 1b being combined.

  On the other hand, in FIG. 8, a mounting bracket 8 is obtained by increasing the mechanical strength by welding three reinforcing portions 8r to an L-shaped steel plate having a vertical portion 8v and a horizontal portion 8h. FIG. 9 is a view taken along arrow IX in FIG. 8 of the mounting bracket 8. In FIG. 8, elongated portions 8 a extending in the vertical direction are formed at four positions in the vertical portion 8 v of the mounting bracket 8. The chassis frame 1a has a round hole 1c corresponding to the long hole 8a. The mounting bracket 8 is temporarily fixed to the chassis frame 1a with bolts, nuts or the like (not shown) with the long hole 8a and the round hole 1c combined. Next, in FIG. 9, the horizontal portion 8h of the mounting bracket 8 is formed with two long holes 8b extending in the left-right direction (vehicle width direction). The step stay 6 is formed with two long holes 6a so as to be orthogonal to the two long holes 8b. The mounting bracket 8 is temporarily fixed to the step stay 6 with the following bolts or the like by combining the long holes 8b and 6a.

  10 is a cross-sectional view of the bodywork bracket 8 and the step stay 6 taken along the line XX in FIG. As shown in the figure, the step stay 6 is formed by bending a steel plate to ensure a certain mechanical strength, and a horizontal portion 8 h of the mounting bracket 8 is attached thereto by a bolt 11 and a nut plate 12. As shown in FIG. 11, the nut plate 12 is obtained by welding a nut 122 to an elongated flat plate 121 having two holes 121a. The pitch between the two nuts 122 coincides with the pitch between the two long holes 8b and the pitch between the two long holes 6a shown in FIG.

  In the unit 100 after being temporarily fixed as described above, the load receiving base 301 is first held at the rising end position. At this time, the position on the load receiving surface corresponding to the position of the stopper device ST (FIG. 2) in the vehicle width direction, that is, the approximate center in the width direction of the load receiving surface 301s is the height of the floor surface 2a of the load box 2 in FIG. The protruding length of the stopper bolt 318 is adjusted so that it becomes the rising end at the coincidence (height adjustment 1). In addition, positioning is adjusted in the longitudinal direction within the range of the long holes 9a (FIG. 7) and 6a (FIG. 9). Next, with respect to the left-right direction, the starboard side mounting bracket 9 is plate-shaped, and due to the fact that a certain degree of deflection is possible in this direction and the presence of the long hole 8b (FIG. 9), the long hole 8b Adjust the positioning within the range. Then, the vertical positioning is adjusted within the range of the long hole 8a (FIG. 8) formed in the vertical portion 8v of the mounting bracket 8 on the port side (height adjustment 2).

Thus, by adjusting the height at two locations, the left and right heights of the load receiving surface 301s can be adjusted, and the entire load receiving surface 301s is easily flush with the floor surface 2a. be able to. Therefore, even when the width of the cargo receiving platform 301 is narrower than the width of the cargo box 2 and there is only one stopper device ST of the upper arm 309, the planes of the floor surface 2a and the cargo receiving surface 301s of the cargo box 2 are easily the same. Sex can be secured. Further, since the load on the lower arm does not increase as compared with the case where a stopper is provided on each of the pair of lower arms 305, an inexpensive configuration can be achieved.
After the positioning is completed in this manner, the left and right mounting brackets 8 and 9 are fixed to the chassis frame 1a by welding.

In the above configuration, as shown in FIG. 2, the port side mounting bracket 8 whose vertical mounting position can be adjusted includes a support portion 306 and a stopper bolt 318 compared to the starboard side mounting bracket 9. Since it is at a position further away from the stopper device ST in the vehicle width direction and the distance is sufficiently secured, the adjustment to the “same plane” is easy. However, in principle, as long as this distance is short, as long as it is not zero, it is possible to adjust two places, and therefore the flatness of the floor surface 2a of the cargo box 2 and the receiving surface 301s can be ensured. For example, in FIG. 2, the starboard side mounting bracket 9 is close to the stopper device ST in the vehicle width direction. However, even if the mounting position of the temporary fixing bracket 9 can be adjusted in the vertical direction, the cargo box 2 It is possible to ensure the flatness of the floor surface 2a and the receiving surface.
Further, not only one of the mounting brackets 8 and 9 but also both can be positioned and adjusted in the vertical direction. In this case, three adjustments including adjustment by the stopper device ST are possible.

In FIG. 2, the starboard side mounting bracket 9 is close to the upper arm 309 in the vehicle width direction. For this reason, the moment which the load which acts on the flame | frame 302 from the rotation fulcrum of the upper arm 309 centering on the bracket 9 for mounting is comparatively small, Therefore The bending of the flame | frame 302 can be suppressed.
Further, in the above embodiment, the long hole 8a in the vertical direction is provided in the bodywork bracket 8, but if a similar long hole is provided in the chassis frame 1a, the hole in the bodywork bracket 8 may not be a long hole. In short, any configuration that can adjust the positioning in the vertical direction may be used.
In the above-described embodiment, the starboard side mounting bracket 9 has a flat plate shape, but may have an L shape similar to (symmetrical to the left) the starboard side mounting bracket 8.
In the above embodiment, the horizontal portion 8 h of the bodywork bracket 8 is attached to the step stay 6, but it may be attached directly to the frame 302 instead of the step stay 6.
In the above-described embodiment, the stopper device ST is configured by bringing the stopper bolt 318 into contact with the support portion 306 on the frame 302 side. However, these members may be arranged in the reverse order. That is, the stopper bolt 318 may be provided on the frame 302 side.

  Further, in the above embodiment, the load receiving platform lifting / lowering device 3 in which the width of the load receiving platform 301 is about half of the width of the packing box is used. However, a narrower load receiving platform may be used. It is also possible to use a cradle having a width that is more than half of the width of the. Moreover, arrangement | positioning of the narrow receiving stand raising / lowering apparatus 3 is not restricted to the structure approached toward the right side door, You may provide near the left side door, and the center may be sufficient.

It is a rear view of the load receiving table raising / lowering device by one Embodiment of this invention. It is the top view and back view which show units, such as a cargo receiving stand raising / lowering apparatus. FIG. 3 is a side view of the load receiving platform lifting device (load receiving block is also indicated by a virtual line) as viewed from the direction of arrow III in FIG. It is a perspective view of the raising / lowering device (however, illustration of one part is abbreviate | omitted) seen from the port side. It is the top view and side view of an upper arm. It is the side view which looked at the state which unfolded the receiving stand from the starboard side. It is the figure which looked at the state where the unit shown in FIG. 2 is attached to a vehicle body from the starboard side. It is the figure which looked at the state where the unit shown in FIG. 2 is attached to a vehicle body from the port side. It is the IX arrow line view in FIG. 8 of the bracket for mounting. FIG. 10 is a cross-sectional view taken along the line XX in FIG. 9 of the mounting bracket and the step stay. (A) is a front view of a nut plate, (b) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 2 Cargo box 3 Loading stand raising / lowering device 8,9 Bracket for bodywork 300 Lifting device 301 Loading stand 302 Frame (support base)
305 Lower arm 306 Support part 309 Upper arm 318 Stopper bolt ST Stopper device (support part 306, stopper bolt 318)

Claims (2)

A receiving platform having a width narrower than the width of the packing box;
A support base extending in the vehicle width direction;
A pair of left and right lower arms that are pivotably attached to the support base, and a substantially single arm that is disposed between the pair of lower arms and pivotally attached to the support base; And a pair of lower arms, each having an upper arm that constitutes a parallel link, supporting the load receiving table, and raising and lowering the same,
A stopper device for the upward movement of the upper arm, the position of stopping the upward movement being adjustable,
A pair of mounting brackets provided on the support base and disposed on the vehicle body side at a position away from the stopper device in the vehicle width direction, at least one of which is temporarily fixed when attached to the chassis frame of the vehicle body A receiving platform elevating device characterized in that the mounting position of can be adjusted in the vertical direction.   The load receiving platform lifting / lowering device according to claim 1, wherein, of the pair of mounting brackets, the one mounting bracket is farther from the stopper device in a vehicle width direction.

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