JP2007331630A - Load support lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load support lifter for preventing the fall of a load support due to damage to a wire. <P>SOLUTION: The load support lifter comprises a fixed pulley 7 having two-line pulleys 7a, 7b provided at the upper part in a left post 2a, a hydraulic cylinder 6 inserted in the left post 2a on the lower side of the fixed pulley 7, a moving pulley 8 having two-line pulleys 8a, 8b fixed to the rod front end of the hydraulic cylinder 6 so as to be moved up and down in the left post 2a with the telescopic motion of the hydraulic cylinder 6, a first wire 30a having one end fixed to the left post 2a and bridged between the pulleys 7a, 8a for suspending and supporting a left slider 3a, a second wire 30b having one end fixed to the left post 2a and bridged between the pulleys 7b, 8b for suspending and supporting a right slider 3b, and the load support 4 supported by the sliders 3a, 3b so as to be lifted up and down together with the sliders 3a, 3b with the telescopic motion of the hydraulic cylinder 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a loading platform lifting / lowering device that supports a loading / unloading operation of a load on a loading platform of a vehicle.

  In the loading platform lifting device, a slider is slidably attached to a pair of left and right columns fixed to the loading platform of the vehicle, and the loading platform is lifted and lowered along with the slider by supporting the loading platform with the left and right sliders. There is something to make. In this type of load carrier lifting device, a wire with a slider suspended is hung around a pulley provided inside a column, and the wire is pulled or returned by a hydraulic cylinder in a cross member provided at the rear end portion of the bottom plate of the vehicle carrier. In many cases, the suspension position of the slider is changed and the load receiving table is moved up and down.

  However, when considering mounting to a small vehicle in which a loading platform is provided on the vehicle chassis without using any special reinforcing member or supporting member, the thickness of the bottom plate of the loading platform is insufficient and a cross member can be provided. In many cases, it is not possible to attach the load receiving device lifting / lowering device having the above configuration.

  Therefore, there is one in which a hydraulic cylinder is inserted in one of the columns. In this type of load receiving platform lifting device, one end is fixed to one column and one slider is suspended by a wire hung on a pulley provided at the top of the column, and this wire is operated by a hydraulic cylinder. Change the hanging position of the slider. At this time, in order to reduce the manufacturing cost and the product weight from the viewpoint of restraining the hydraulic cylinder used for the load receiving device lifting / lowering device to one, the wire suspended from the other slider is appropriately wound around the pulley and connected to the one slider. May be.

  That is, the other slider is connected to one slider by a wire, and the load is supported by the one slider via the wire. When one slider is pulled up by the hydraulic cylinder, the other slider is pulled up by the one slider. In such a manner, the left and right sliders are linked by a wire and interlocked (see Patent Document 1).

Japanese Utility Model Publication 4-31166

  However, in the above prior art, since the load of the other slider is received by one slider connected by a wire, the wire that suspends one slider by any chance due to friction or fatigue with the pulley. When it is cut off, both the left and right sliders are in an unsupported state, and the load receiving table falls.

  The present invention has been made in view of the above, and an object of the present invention is to provide a load receiving table lifting / lowering device capable of preventing the load receiving table from dropping due to wire damage.

  (1) In order to achieve the above object, the present invention provides a load receiving platform lifting / lowering device for supporting a loading / unloading operation of a load on a vehicle loading platform, a pair of columns fixed to the loading platform, and each of the columns supported by the columns. A pair of sliders that can be slid up and down, two rows of fixed pulleys provided in the upper part of one of the pair of columns, and a state in which the rod side faces downward below the fixed pulley A hydraulic cylinder inserted into the one column, and a two-row movable pulley fixed to the rod tip of the hydraulic cylinder and moving up and down in the column as the hydraulic cylinder expands and contracts. One end is fixed to the one column and is wound around the first row of pulleys of the fixed pulley and the movable pulley, and the other end is fixed to the slider that slides against the one column. A first wire that suspends and supports the slider, and one end of which is fixed to the one support column and is hung around the second row of pulleys of the fixed pulley and the movable pulley, and the other end of the pair of the pair of wires. A second wire that is fixed to the slider that slides with respect to the other of the columns and supports the other slider in a suspended manner, and is supported by the pair of sliders and extends and contracts as the hydraulic cylinder expands and contracts. A load receiving platform that moves up and down together with the pair of sliders is provided.

  (2) In the above (1), preferably, a total of four wheels are provided on each of the upper and lower stages for each of the pair of sliders, and the rollers roll on the inner wall of the column when the slider is raised and lowered, A relay pulley provided at a lower portion of the support and configured to change the direction of the second wire and relay the second wire toward the other support, and a lower roller disposed on the side closer to the other support is connected to the other roller. It is characterized by being disposed at a higher position than the lower roller disposed on the side far from the support column.

  According to the present invention, even if the first wire is broken, the slider is supported by the second wire, so that it is possible to prevent the load receiving table from falling due to the damage of the wire.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a left side view showing the appearance of a vehicle provided with a load receiving table lifting apparatus according to an embodiment of the present invention, and FIG. 2 is a rear view.
In this specification, the driver's seat side (the left side in FIG. 1) of the vehicle is the front, and the cargo bed side (the right side in FIG. 1) is the rear. The left and right correspond to the left and right in FIG.

  As shown in FIGS. 1 and 2, the load receiving platform lifting apparatus of the present embodiment is a pair of left and right posts (posts) 2 a fixed and erected on both sides in the width direction of the rear end portion of the vehicle loading platform 1. , 2b, a pair of left and right sliders 3a and 3b which are inserted into the posts 2a and 2b and guided by the posts 2a and 2b, respectively, and can slide up and down, and are supported by the sliders 3a and 3b so as to be rotatable. A load receiving table 4 that moves up and down together with 3a and 3b is provided.

3 is a left side view of the load receiving table lifting device, FIG. 4 is a rear view, FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4, and FIG. 6 is a right side view. In FIG. 3, the inside of the post 2a is shown through.
In these drawings, the same parts as those in the above-described drawings are denoted by the same reference numerals as those in the above-mentioned drawings, and the description thereof is omitted.

  As shown in FIGS. 3 to 6, hollow square pipes or the like are used for the posts 2a and 2b. As will be described later, the inside of the posts 2a and 2b is separated from the front chamber 5a by the partition wall 5 except for the vicinity of the upper end portion. It is separated into two spaces before and after the rear chamber 5b. The front chamber 5a and the rear chamber 5b may be separated by a plate-shaped partition wall inserted as a partition plate in one square pipe, or one square pipe and another square pipe or a U-shape. As a result, the wall surface of the steel material that separates the front chamber and the rear chamber may constitute the partition wall 5 when the angle members or the like are connected side by side. The sliders 3a and 3b are inserted into the rear chambers 5b in the posts 2a and 2b, respectively.

  The loading platform 4 constitutes the rear side wall (tailgate) of the loading platform 1 while standing substantially vertically when not in use. Further, as shown in FIG. 3, when it is rotated horizontally with respect to the sliders 3a and 3b, the load receiving platform 4 functions as a load and a worker step when loading and unloading the load. It is used for assisting loading and unloading work by lifting and lowering between the floor height of 1 and the height of the ground according to the operation of the operator.

  The ascending / descending operation of the load receiving platform 4 and the sliders 3a and 3b is accompanied by the expansion / contraction operation of one hydraulic cylinder 6. The hydraulic cylinder 6 expands and contracts by pressure oil from a hydraulic pump (not shown), and is inserted into the space on the front side of the left post 2a with the rod side facing downward. The bottom side of the hydraulic cylinder 6 positioned on the upper side is fixed to the inner wall surface of the front chamber 5a of the left post 2a or the partition wall 5 directly or via some support member.

  A fixed pulley 7 having two rows of left and right pulleys 7a and 7b (see FIG. 8 below) is provided at an upper position in the left post 2a and above the hydraulic cylinder 6. The fixed pulley 7 has a structure in which a bracket 11 that rotatably supports the fixed pulley 7 is fixed to the upper portion of the hydraulic cylinder 6. For example, the fixed pulley 7 is rotatably supported on the left and right wall surfaces of the left post 2a. A configuration is also conceivable. Further, the fixed pulley 7 has a rotating shaft positioned higher than the upper end of the partition wall 5 so as not to interfere with the partition wall 5, the front edge portion is on the front chamber 5a side of the left post 2a, and the rear edge portion is the same. It faces the rear chamber 5b side of the post 2a.

  A bracket 9 that rotatably supports the moving pulley 8 is fixed to the rod tip of the hydraulic cylinder 6 so that the moving pulley 8 moves up and down in the front chamber 5a as the hydraulic cylinder 6 expands and contracts. It has become. The movable pulley 8 includes two rows of left and right pulleys 8a and 8b (see FIG. 13 below) corresponding to the pulleys 7a and 7b of the fixed pulley 7, respectively.

  The left and right pulleys 7a and 7b constituting the fixed pulley 7 and the pulleys 8a and 8b constituting the movable pulley 8 may be configured to rotate together, but at least one of the fixed pulley 7 and the movable pulley 8 is 2 More preferably, the two pulleys can be rotated independently of each other.

  On the other hand, a single row of fixed pulleys 12 is provided at the same height as the fixed pulley 7 in the upper part of the right post 2b. The fixed pulley 12 is rotatably supported with respect to the left and right wall surfaces of the right post 2b. As with the fixed pulley 7, the fixed pulley 12 has a rotating shaft positioned higher than the upper end of the partition wall 5 so as not to interfere with the partition wall 5 in the right post 2b. The rear edge part faces the rear chamber 5b side of the post 2b on the front chamber 5a side.

  In addition, a hollow connecting member 10 is disposed below the posts 2a and 2b along a horizontal plane and a second wire 30b (described later) is passed through the post 2a and 2b. It is connected. As shown in FIG. 5, the connecting member 10 is connected to the outer wall surface on the inner side (opposing post side) of the rear chambers 5b of the posts 2a and 2b, and the portion through which the second wire 30b is passed is rearward toward the opposing post side. It is comprised by the inclined both ends (the left end part 10a and the right end part 10b), and the intermediate part 10c which connects these both end parts 10a and 10b, and the intermediate part 10c is located a little behind the posts 2a and 2b. .

  Further, both end portions 10a and 10b of the connecting member 10 are formed integrally with a bracket that supports the relay pulleys 15a, 15b, 16a, and 16b, and the relay pulleys 15a and 16a are connected to the right end portion 10b at the left end portion 10a. The relay pulleys 15b and 16b are rotatably supported. The relay pulleys 15a, 15b, 16a, 16b turn the second wire 30b spanned between the posts 2a, 2b to relay the second wire 30b passing through one post toward the other post. .

  The relay pulley 15a on the left side is along the passing direction of the second wire 30b in the left end portion 10a with the front edge facing the rear chamber 5b of the left post 2a along the vertical plane (with the rotation axis horizontal). The rotating shaft is inclined with respect to the fixed pulley 7. The lower edge portion of the relay pulley 15a (strictly, the groove portion where the wire is hung) has the same height as the internal space of the intermediate portion 10c of the connecting member 10.

  The relay pulley 16a is connected to the left end portion 10a and the intermediate portion 10c of the connecting member 10 on the side inscribed in the left end portion 10a and the intermediate portion 10c of the connecting member 10 in a state along the horizontal plane (rotating axis is vertical). It is arranged in the vicinity. The height of the groove portion on which the wire of the relay pulley 16a is hung is approximately the same as the lower edge portion of the groove portion of the relay pulley 15a.

  The relay pulley 15b on the right side is along the direction of passage of the second wire 30b in the right end portion 10b with the front edge facing the front chamber 5a of the right post 2b along the vertical plane (with the rotation axis horizontal). The rotating shaft is inclined with respect to the fixed pulley 12. The lower edge portion of the relay pulley 15b (strictly, the groove portion where the wire is hung) has the same height as the internal space of the intermediate portion 10c of the connecting member 10.

  The relay pulley 16b is connected to the right end portion 10b and the intermediate portion 10c of the connecting member 10 on the side inscribed in the right end portion 10b and the intermediate portion 10c of the connecting member 10 in a state along the horizontal plane (rotating axis is vertical). It is arranged in the vicinity. The height of the groove portion on which the wire of the relay pulley 16b is hung is approximately the same as the lower edge portion of the groove portion of the relay pulley 15b.

7 is an enlarged side view showing a detailed configuration viewed from the left side of the left post 2a, FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7, FIG. 9 is a cross-sectional view taken along the line IX-IX, and FIG. 11 is a cross-sectional view taken along the line XI-XI, FIG. 12 is a cross-sectional view taken along the line XII-XII, FIG. 13 is a cross-sectional view taken along the line XIII-XIII, and FIG. 14 is a cross-sectional view taken along the line XIV-XIV. FIG.
In these drawings, the same parts as those in the above-described drawings are denoted by the same reference numerals as those in the above-mentioned drawings, and description thereof is omitted.

  As shown in FIGS. 7 to 14, the left slider 3 a that slides with respect to the left post 2 a has a side surface that forms the long side of the rectangular cross section along the front-rear direction and a surface that forms the short side toward the front-rear direction. It is formed of a plate-like member such as a flat bar or a steel plate, and its rear portion is exposed to the outside of the post 2a through a slit 16 provided in the vertical direction on the rear wall surface of the rear chamber 5b of the left post 2a. Yes. A bracket 17 is provided in the vicinity of the lower end of the exposed portion, and brackets 18 provided at both ends of the load receiving platform 4 are connected to the bracket 17 via pins 19 so as to be rotatable.

  The left slider 3a is provided with a total of four rollers 20a to 20d. These rollers 20a to 20d roll on the inner wall of the left post 2a when the left slider 3a moves up and down. Since the load receiving table 4 receives a moment applied to the left slider 3a due to the weight, In contrast to the upper left and right rollers 20a and 20b that roll on the wall surface, the lower left and right rollers 20c and 20d are arranged such that the upper rollers 20a and 20d roll on the inner wall surface (partition wall 5) of the front wall of the rear chamber 5b. It is attached to the left slider 3a at a position closer to the front than 20b.

  At this time, the upper rollers 20a and 20b are provided substantially at the upper end of the left slider 3a. The upper and lower rollers 20a and 20c arranged on the side farther from the other post (in this case, the right post 2b) of the left slider 3a are sufficient to support the moment applied to the left slider 3a. Separated by a certain distance.

  On the other hand, the lower roller 20d disposed on the right side of the left slider 3a is disposed at a higher position than the lower roller 20c disposed on the left side, and the upper and lower rollers 20b and 20d on the right side of the left slider 3a. The interval is narrower than the interval between the left rollers 20a and 20c. The difference in height between the lower rollers 20c and 20d ensures at least the height dimension of the relay pulley 15a. In the case of this example, the roller 20d is disposed at a substantially intermediate position between the rollers 20a and 20c.

  The left slider 3a is provided with a support plate 21 on the front side for fixing the first wire 30a for suspending the left slider 3a. The mounting height of the support plate 21 is not particularly limited. However, when the center of gravity of the left slider 3a including the load receiving platform 4 is taken into consideration, the highest position of the left slider 3a is preferable. In the case of this example, the upper rollers 20a and 20b are avoided, and the support plate 21 is provided at a position between the upper rollers 20a and 20b and the lower high roller 20d. Further, the support plate 21 is provided with a notch for passing the second wire 30b on the right side of the region where the first wire 30a is attached (see FIG. 9).

  The configuration of the right slider 3b that slides with respect to the right post 2b is substantially symmetrical with the left slider 3a, and thus illustration and description thereof are omitted. However, the cutout portion of the support plate 21 may be omitted in the right slider 3b.

15 and 16 are diagrams schematically showing the connection relation of the wires in the present embodiment.
In these drawings, the same parts as those in the above-described drawings are denoted by the same reference numerals as those in the above-mentioned drawings, and description thereof is omitted.

  As shown in FIGS. 15 and 16, in the load receiving table lifting apparatus of the present embodiment, two wires, a first wire 30a for hanging and supporting the left slider 3a and a second wire 30b for hanging and supporting the right slider 3b, are provided. The wire is used.

  As shown in FIG. 15 and FIGS. 7 to 9, the first wire 30 a is a fastener 32 a with respect to the support plate 31 fixed to the surface of the left post 2 a facing the front chamber 5 a of the partition wall 5. It is fixed by. The first wire 30a starting from the end fixed to the support plate 31 extends downward through the space behind the hydraulic cylinder 6 in the front chamber 5a of the left post 2a, and further to the left of the movable pulley 8. And extends upward through a space on the front side of the hydraulic cylinder 6 in the front chamber 5a of the left post 2a. And it is hung around the left pulley 7a of the fixed pulley 7 and extends downward through the space on the front side of the left slider 3a in the rear chamber 5b of the left post 2a. The other end (terminal) is fixed to 21.

  Thus, the left slider 3a is suspended and supported by the first wire 30a, and the load is supported by the left post 2a via the support plate 31. With such a configuration, when the hydraulic cylinder 6 extends, the movable pulley 8a descends and the first wire 30a is pulled, and the upward pulling force is dominant in the force acting on the left slider 3a. On the contrary, when the hydraulic cylinder 6 is retracted, the movable pulley 8a is raised and the first wire 30a is pulled back by the weight of the left slider 3a and the weight of the load receiving platform 4, and the force acting on the left slider 3a is reduced by the weight and the load receiving platform. The downward pulling force due to the weight of 4 becomes dominant.

  On the other hand, as shown in FIGS. 16 and 7 to 14, one end of the second wire 30b is fixed to the support plate 31 of the left post 2a by a fastener 32b. The hydraulic cylinder 6 extends downward through the space behind the hydraulic cylinder 6 in the front chamber 5a of the post 2a, and is further wound around the right pulley 8b of the movable pulley 8 so that the hydraulic cylinder 6 in the front chamber 5a of the left post 2a It extends upward through the space on the front side. Then, it is hung around the right pulley 7b of the fixed pulley 7 and extends downward through the space on the front side of the left slider 3a in the rear chamber 5b of the left post 2a, and passes through the notch portion of the support plate 21. To the relay pulley 15a.

  The second wire 30b hung around the relay pulley 15a changes the direction toward the right post 2b toward the rear, and is immediately hung around the relay pulley 16a to change its direction and extend straight toward the right relay pulley 16b. . When the second wire 30b extends upward through the front chamber 5a of the right post 2b, the second wire 30b is fixed after being turned around the relay pulley 15b by changing the direction further forward toward the right side via the relay pulley 16b. It is hung around the pulley 12 and extends downward through the rear chamber 5b of the right post 2b, and the other end (end) is fixed to the support plate 21 of the right slider 3b by the fastener 34.

  The right slider 3b is suspended and supported by the second wire 30b as described above, and the load is supported by the left post 2a via the support plate 31 in the same manner as the left slider 3a. With such a configuration, when the hydraulic cylinder 6 extends, the movable pulley 8b descends and the second wire 30b is pulled, and the upward pulling force is dominant in the force acting on the right slider 3b. On the contrary, when the hydraulic cylinder 6 is retracted, the movable pulley 8b is raised and the second wire 30b is pulled back by the weight of the right slider 3b and the weight of the load receiving table 4, and the force acting on the right slider 3b is reduced by the weight and the load receiving table. The downward pulling force due to the weight of 4 becomes dominant.

  In the case of the present embodiment, the distance between the fixed pulleys (the pulleys 7a and 7b) and the movable pulleys (the pulleys 8a and 8b) changes in the same manner in synchronization with the expansion and contraction of the hydraulic cylinder 6 due to the above-described configuration. The amount of pullback of the wires 30a and 30b becomes the same with the expansion and contraction of 6. Accordingly, the left and right sliders 3a and 3b move up and down in synchronization with the expansion and contraction of the hydraulic cylinder 6, thereby smoothly moving the load receiving table 4 in the horizontal posture.

Next, the operation of the cargo receiving platform lifting / lowering device of the present embodiment having the above-described configuration will be described.
When using the load receiving table lifting device, first, the lock of the load receiving table 4 in an upright state as shown in FIG. 1 is released, and the load receiving table 4 is deployed in a horizontal posture as shown in FIG. When unloading the load on the loading platform 1, the load on the loading platform 1 is moved to the loading platform 4 when the loading platform 4 is at the floor level of the loading platform 1 in this way.

  Then, by performing a corresponding operation using an operating device (not shown), the hydraulic cylinder 6 is retracted, and the load receiving platform 4 is lowered to the ground level. When loading a load onto the loading platform 1, the load is placed on the loading platform 4 when the loading platform 4 is at the ground level.

  Thereafter, the hydraulic cylinder 6 is extended by performing a corresponding operation using an operating device (not shown), and the load receiving platform 4 is raised to the floor height of the loading platform 1. When loading a load onto the loading platform 1, the load is transferred from the loading platform 4 to the loading platform 1 during this time. When loading or unloading the cargo is continued, the above operation is repeated, and when the operation is completed, the cargo receiving table 4 is raised and the cargo receiving table 4 is locked.

Then, the effect | action obtained by the cargo receiving stand raising / lowering apparatus of this Embodiment is demonstrated sequentially.
(1) Prevention of fall of load receiving table FIG. 17 is a diagram schematically showing a connection relation of wires in a comparative example illustrated as a comparative reference of the load receiving lift device of the present embodiment.
In FIG. 17, the configuration is the same as that of the present embodiment except for the point of comparison with the present embodiment described in FIGS. 1 to 16. The same components as those in the present embodiment are denoted by the same reference numerals as in FIGS.

  In this comparative example, the left post 2a is provided with a fixed pulley 7A and a movable pulley 8A that are a row of pulleys. The left slider 3a is fixed to the support plate 31 of the left post 2a with respect to the fixed pulley 7A and the movable pulley 8A. The support plate 21 is suspended and supported by being fixed by a fastener 32A via a wire 30A that is wound around the wire. The suspension structure of the left slider 3a is substantially the same as that of the first wire 30a of the present embodiment.

  On the other hand, unlike the present embodiment, the wire 30B from which the right slider 3b is suspended is relayed through the relay pulleys 15b, 16b, 16a, 15a and fixed to the lower portion of the support plate 21 of the left slider 3a by a fastener 32B. Yes.

  That is, the right slider 3b is connected to the left slider 3a by the wire 30B and supported by the left slider 3a via the wire 30B. When the left slider 3a is pulled up along with the extension operation of the hydraulic cylinder 6, the left slider 3b Pulled up by 3a.

  However, in the configuration in which the load of the right slider 3b is supported by the left slider 3a as in this comparative example, if the wire 30A that suspends the left slider 3a breaks due to friction or fatigue with the pulley, the left and right sliders Both 3a and 3b are in an unsupported state, and the load receiving table falls.

  On the other hand, in the present embodiment described above, the left and right sliders 3a and 3b are directly supported by the left post 2a by the first and second wires 30a and 30b, respectively, and thus the first and second wires 30a and 30b. Even if any one of the above occurs, it is possible to avoid both the left and right sliders 3a and 3b from being in an unsupported state. Therefore, it is possible to prevent the load receiving table 4 from dropping due to wire damage.

  In the comparative example of FIG. 17, the wires 30A and 30B are connected via the support plate 21, so that the sliders 3a and 3b are substantially suspended by a single wire. Therefore, the support load applied to the wire 30A that receives the load of the left slider 3a close to the support position (support plate 31) is larger than the support load applied to the wire 30B. That is, the wire 30A has a weight that is more than half of the total weight of the structure including the sliders 3a and 3b and the load receiving platform 4 and the load. Therefore, a wire rope having a large diameter is required for the wire 30A.

  On the other hand, in the present embodiment, substantially the same load acts on the first and second wires 30a and 30b, so that the required wire rope diameter can be reduced as compared with the wire 30A of the comparative example. There is also an advantage that the same wire rope can be used for the first and second wires 30a and 30b.

(2) Compacting of the load receiving table lifting device FIG. 18 is a left side view of another comparative example illustrated as a comparative control of the load receiving table lifting device of the present embodiment.
18 is the same as the configuration of the present embodiment except for the points of comparison with the present embodiment described in FIGS. The same components as those in the present embodiment are denoted by the same reference numerals as in FIGS.

  In a load receiving device lifting apparatus that vertically lifts the load receiving table 4 with respect to the posts 2a and 2b using wires, the left and right sliders (only the left slider 3A is shown) are provided with four wheels in total up and down. Usually it is. When a roller is attached to a plate-like slider, two upper and lower rollers are required to support the moment applied to the slider and maintain the slider's posture. There are preferably two left and right rollers at each stage. Therefore, a four-wheel roller is generally provided on the slider.

  In the comparative example of FIG. 18, an upper roller 20A and a lower roller 20B each composed of two rollers are provided on the slider, and the two rollers constituting the upper roller 20A have the same height. Unlike the above, the two rollers constituting the lower roller 20B have the same height.

  At this time, if the left and right posts are respectively provided with hydraulic cylinders and the left and right sliders are moved up and down independently by the respective hydraulic cylinders, there is no need to hang wires between the left and right posts. If two are used, the manufacturing cost and the product price will increase, and the weight of the load receiving platform lifting device will increase significantly. In addition, it is necessary to precisely synchronize the expansion and contraction operations of the two hydraulic cylinders in order to smoothly lift and lower the load receiving table while maintaining the horizontal posture. On the other hand, in the present embodiment and the comparative example of FIG. 18, the lifting platform of the left and right sliders is synchronized by the wire spanned between the posts 2 a and 2 b, so that the load receiving table can be smoothly moved by the single hydraulic cylinder 6. Can be moved up and down.

  However, when a wire is passed over the posts 2a and 2b, it is necessary to provide a wire relay pulley (such as the relay pulley 15a) on the posts 2a and 2b. Since such a relay pulley turns the wire passed through the post toward the other post, a part of the pulley inevitably faces the post (FIG. 5 of the present embodiment). Etc.)

  Accordingly, when the left and right rollers of the lower roller 20B of the slider are set to the same height as in the comparative example of FIG. 18, the roller closer to the other post of the lower roller 20B (the lower roller on the right side in the comparative example). Will interfere with the relay pulley for turning the wire, so that the lower roller 20B is above the relay pulley, and the lower limit position when the slider is lowered is limited (see the two-dot chain line in FIG. 18). It is not preferable to lower the position of the relay pulley from the current state in order to ensure the minimum ground clearance of the load receiving table lifting device during normal operation.

  Therefore, in order to ensure a sufficient and sufficient distance between the lift stroke of the slider and the upper and lower rollers 20A and 20B, a moving space for the lower roller 20B of the slider must be created above the relay pulley. The position of the fixed pulley 7 at the top of the post is also high. As a result, it is difficult to reduce the height dimension required for the support column, and the downsizing of the load receiving platform lifting apparatus has been hindered. In addition, depending on the shape of the loading platform of the vehicle to which the loading platform lifting device is attached, the post tends to protrude upward.

  On the other hand, according to the present embodiment described before FIG. 16, the lower roller (the roller 20d in the left slider 3a) on the side close to the other post of the slider is moved to the lower roller (the left slider 3a on the side farther from the other post). Since the roller 20c) is positioned higher than the roller 20c), as shown by the two-dot chain line in FIG. 3, the roller moves down and the lower roller 20c reaches the height of the relay pulley 15a. 20d does not interfere with the relay pulley 15a. That is, the moving space of the lower roller 20c can be shifted downward so that the height overlaps with the relay pulley 15a.

  Thereby, while the distance between the lower roller 20c and the upper rollers 20a and 20b and the lift stroke of the slider are ensured sufficiently and sufficiently, the moving space of the slider rollers 20a to 20d can be created at a low position, and the fixed pulley 7 The position can also be reduced. Thus, the height dimension required for the posts 2a and 2b can be shortened, and the load receiving table lifting device can be downsized. Further, the amount of upward protrusion of the posts 2a and 2b can also be reduced.

  The load receiving platform lifting / lowering device according to the embodiment described above is particularly suitable for application to a light vehicle in which it is difficult to provide a cross member due to dimensional constraints, but is not limited to a light vehicle, and other cargo handling including a load carrier and a container. The load receiving table lifting device of the present invention can also be applied to a vehicle. Moreover, although the case where the hydraulic cylinder was inserted in the left post was described as an example, it is naturally possible to insert the hydraulic cylinder in the right post. In this case, a configuration that is symmetrical to the above configuration is sufficient. In these cases, the same effect as the above embodiment can be obtained.

  Further, in the above embodiment, the case where the present invention is applied to the load receiving platform lifting device in which the load receiving platform in the standing posture constitutes the tail gate of the vehicle loading platform has been described as an example. The present invention can also be applied to an apparatus. For example, the present invention can also be applied to a structure in which a load receiving stand when not in use is erected along the outer wall portion of the gate or door behind the load carrier including the container. Moreover, when attaching to a container, a cargo receiving platform raising / lowering apparatus may be attached not to the outer wall part of a door but to an inner wall part. In addition to the rear of the loading platform, the loading platform lifting device may be attached to the side of the loading platform. In these cases, the same effect can be obtained by applying the present invention.

It is a left side view showing the appearance of the vehicle provided with the load receiving table raising / lowering device according to an embodiment of the present invention. It is a rear view showing the appearance of the vehicle provided with the load receiving table lifting device according to the embodiment of the present invention. It is a left view of the load receiving table raising / lowering apparatus which concerns on one embodiment of this invention. It is a rear view of the load receiving table lifting / lowering device according to the embodiment of the present invention. It is sectional drawing by the VV cross section in FIG. 4 of the load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. It is a right view of the load receiving table raising / lowering apparatus which concerns on one embodiment of this invention. It is a side view which expands and represents the detailed structure seen from the left side of the left post with which the cargo receiving platform raising / lowering apparatus which concerns on one embodiment of this invention was equipped. It is sectional drawing by the VIII-VIII cross section in FIG. It is sectional drawing by the IX-IX cross section in FIG. It is sectional drawing by the XX cross section in FIG. It is sectional drawing by the XI-XI cross section in FIG. It is sectional drawing by the XII-XII cross section in FIG. It is sectional drawing by the XIII-XIII cross section in FIG. It is sectional drawing by the XIV-XIV cross section in FIG. It is the figure which represented typically the connection relation of the 1st wire in this Embodiment. It is the figure which represented typically the connection relation of the 2nd wire in this Embodiment. It is the figure which represented typically the connection relation of the wire in one comparative example illustrated as a comparison reference of the cargo receiving stand raising / lowering apparatus of this Embodiment. It is a left view of the other comparative example illustrated as a comparison contrast of the cargo receiving stand raising / lowering apparatus of this Embodiment.

Explanation of symbols

1 Loading platform 2a, b Post 3a, b Slider 4 Loading platform 6 Hydraulic cylinder 7 Fixed pulley 7a, b pulley 8 Moving pulley 8a, b Pulley 15a, b Relay pulley 16a, b Relay pulley 20a-d Roller 30a First wire 30b First wire 30b 2 wires

Claims (2)

In the loading platform lifting device that supports the loading and unloading work of the cargo on the loading platform of the vehicle,
A pair of struts fixed to the loading platform;
A pair of sliders each guided by these columns and slidable up and down;
Two rows of fixed pulleys provided in the upper part of one of the pair of columns;
A hydraulic cylinder inserted into the one column with the rod side facing down below the fixed pulley;
Two rows of moving pulleys fixed to the tip of the rod of the hydraulic cylinder and moving up and down in the one column as the hydraulic cylinder expands and contracts,
One end is fixed to the one column and is wound around the first row of pulleys of the fixed pulley and the movable pulley, and the other end is fixed to the slider that slides on the one column. A first wire for hanging and supporting the slider;
The one end is fixed to the one support column and is wound around the pulleys in the second row of the fixed pulley and the movable pulley, and the other end is slid on the other support column of the pair of support columns. A second wire fixed to the slider and supporting the other slider in a suspended manner;
A load receiving table elevating apparatus comprising: a load receiving table supported by the pair of sliders and moving up and down together with the pair of sliders as the hydraulic cylinder expands and contracts. The load receiving table lifting device according to claim 1,
A total of four wheels on each of the upper and lower stages for each of the pair of sliders, and a roller that rolls on the inner wall of the column when the slider is raised and lowered;
A relay pulley provided at a lower portion of the support column to change the direction of the second wire and relay it toward the other support column;
The load receiving platform lifting device, wherein a lower roller disposed on a side closer to the other column among the rollers is disposed at a higher position than a lower roller disposed on a side farther from the other column.

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