JP5074107B2 - Lorry with lift floor - Google Patents

Description

  The present invention relates to a freight vehicle with an elevating floor in which another load placement floor is installed on the cargo bed of the freight vehicle so as to be movable up and down.

  Since this type of lorry with a lift floor can load a load on the loading platform and the upper and lower stages on the lift floor, the load space can be used effectively and the transportation efficiency can be improved.

  By the way, as an example of this type of freight vehicle with an elevating floor, there is one disclosed in Japanese Patent Laid-Open No. 2000-219077 (Patent Document 1).

  In this lorry with an elevating floor of Patent Document 1, pillars are erected at four corners on the loading platform, and hydraulic cylinders (four) are installed in the four pillars in a vertical posture, respectively. Are supported by each hydraulic cylinder. A sheave is attached to the distal end of each telescopic rod of each hydraulic cylinder, and the four corners of the elevating floor are suspended by wire ropes through the sheave. And in this lorry vehicle with a raising / lowering floor of patent document 1, a raising / lowering floor can be raised / lowered in a horizontal attitude | position by carrying out synchronous expansion / contraction of four hydraulic cylinders.

JP 2000-219077 A

  However, the freight vehicle with a lift floor of Patent Document 1 uses the four hydraulic cylinders to raise and lower the lift floor, and thus has the following problems.

  (1) The total weight of each hydraulic cylinder (four) becomes heavy, and the weight of the load loaded on the loading platform is limited accordingly.

  (2) In the case where each hydraulic cylinder (four) is installed in the column, the thickness of each column becomes thick, and the effective space on the cargo bed becomes narrow accordingly.

  (3) With four hydraulic cylinders that raise and lower the lifting floor, it is necessary to accurately synchronize the expansion and contraction operations (expansion and expansion timing and expansion speed) of each hydraulic cylinder. For this reason, a precise interlocking synchronization system is required. is necessary. In addition, when even one of the four hydraulic cylinders is not synchronized, there arises a problem that a torsional action acts on the lifting floor or the lifting floor moves up and down in an inclined state.

  Therefore, the present invention can reduce the weight of the driving device and reduce the occupied space of the driving device by allowing the lifting floor on the loading platform to be raised and lowered by a small number (one or two) of driving devices. Elevating floor, which can eliminate or reduce the problem of synchronous operation of the driving device, and can widen the effective space on the loading platform by installing the driving device using the surplus space (thickness range) of the lifting floor The purpose is to provide a lorry with a truck.

  The present invention has the following configuration as means for solving the above problems. The present invention is directed to a lorry vehicle with an elevating floor in which another floor is movably installed on a loading platform of the lorry.

[Invention of Claim 1 of the Present Application]
In the freight vehicle with a lift floor according to the first aspect of the present invention, pillars are erected at the four corners of the cargo bed, and the four corners of the lift floor are guided by the four pillars so that the lift floor can be raised and lowered on the cargo bed. It is installed.

  In the lorry with a lift floor according to claim 1, four ropes for lifting the lift floor are respectively interposed between the four corners of the lift floor and the respective upper positions of the four support posts through the ropes. On the other hand, the four ropes can be lifted and lowered by pulling and feeding the four ropes with one driving device.

  Chains and wire ropes can be used as ropes for lifting the lifting floor. As for the looping ring, a sprocket is used when a chain is used for the rope, and a sheave is used when a wire rope is used for the rope. A predetermined number of ropes are attached to appropriate places on the lifting floor. The four ropes are interposed in a state in which the four ropes can be respectively wound around the ropes and the four corners of the lifting floor can be suspended from the upper positions of the respective columns (four).

  As a driving device for raising and lowering the lifting floor, a hydraulic cylinder is employed that can move a rope operating section that pulls in and draws out each rope in a horizontal linear direction.

  In the lorry with a lift floor according to claim 1, the four ropes can be simultaneously pulled in and out by the same amount with a single drive device (hydraulic cylinder), whereby the lift floor Can be moved up and down while maintaining a horizontal posture.

  On the other hand, the raising / lowering floor uses what installed the floor board on the upper surface of the frame which consists of frame material which has predetermined thickness up and down.

  In the lorry with a lift floor according to the first aspect, the hydraulic cylinder (driving device) is installed within the vertical thickness range of the frame body on the bottom surface of the floor plate in the lift floor.

  The elevating floor has a relatively large area, and a frame frame having an appropriate thickness (for example, about 150 mm) is provided on the lower surface of the floor board so as not to bend by the loaded luggage. Therefore, a space portion having a predetermined height (about 150 mm) is formed on the lift floor in a portion surrounded by a frame on the bottom surface of the floor plate. On the other hand, although the hydraulic cylinder used as a drive device is long, the cylinder diameter is not so large.

  And if this hydraulic cylinder is installed in a horizontal position in the space on the lower surface of the floor plate of the lifting floor, the hydraulic cylinder will fit within the thickness range of the lifting floor (in the surplus space).

In the lorry with a lift floor according to claim 1, the lift floor is moved downward when the drive device is actuated to the lower side of the lift floor between the drive device and the front and rear positions of the loading platform. At least one downside cable is installed at the front and back.

  By the way, when the driving device is operated to the descending side of the lifting floor, the lifting force by each cord disappears and the lifting floor moves down by its own weight. For example, the weight of the load loaded on the lifting floor is extremely displaced. Or if some of the corners of the lift floor are caught on the column (the frictional force is large), the lift floor may not be lowered smoothly while maintaining its horizontal posture only by its own weight. Absent.

  Therefore, as in claim 1, if the lowering rope is provided, the lifting floor is forced to remain in a horizontal posture with the lowering rope when the driving device is operated to the lowering floor lowering side. Can be moved down.

  In the case of two, the lower moving rope is provided near the two struts in the diagonal position of the four struts, and in the case of three, one is located near the center of the width of the front of the loading platform and the other two. If a book is provided near the left and right columns at the rear of the loading platform, and if four are installed in the vicinity of each of the four columns, the lower moving cable will interfere with loading and unloading work on the loading platform even when the lifting floor is raised. do not become.

[Invention of claim 2 of the present application]
In the freight vehicle with a lifting floor according to the invention of claim 2 of the present application, pillars are erected at the four corners of the loading platform of the cargo vehicle. It is installed so that it can move up and down, and four ropes for lifting the lifting floor are interposed between the four corners of the lifting floor 2 and the upper positions of the four columns, respectively. This is the same as that of the first aspect.

  In the lorry with a lift floor according to claim 2, the lift floor can be raised and lowered by pulling and feeding the four ropes two by two drive devices. Each driving device (two units) operates two of the four ropes that support the four corners of the lift floor, but any two ropes may be operated.

  In the case of this second aspect, it is necessary to synchronize both drive devices by using two drive devices to raise and lower the elevating floor. It may be simpler than when synchronizing the devices.

  Further, in the lorry with a lift floor according to claim 2, as in the case of claim 1, a hydraulic cylinder is used as a drive device, and a frame body made of a frame material having a predetermined thickness as a lift floor. In addition, a hydraulic cylinder (driving device) is installed in the upper and lower thickness range of the frame on the lower surface of the floor plate in the lifting floor.

Further, in the lorry with a lift floor according to claim 2, as in the case of claim 1, the drive device operates on the lift floor lowering side between the drive device and the front and rear positions of the loading platform. When this is done, at least one front-and-rear moving rope is interposed to move the lifting floor downward.

  In addition, although the cable for downward movement in this Claim 2 also has the function demonstrated in the said Claim 1, the description described in the said Claim 1 is used for the description.

[Effect of the invention of claim 1 of the present application]
The lorry with a lift floor according to claim 1 of the present application is for lifting a lift floor via a rope ring between the four corners of the lift floor installed on the loading platform so as to freely move up and down and the upper positions of the four columns. In addition, the four ropes are interposed, while the four ropes can be lifted and lowered by pulling and feeding them with a single driving device. Therefore, the lorry with a lift floor according to claim 1 has the following effects.

  (1) Since the lifting / lowering operation of the lifting floor can be performed by one driving device, the driving device for lifting / lowering the lifting floor becomes lighter, and the load on the loading platform can be increased accordingly.

  (2) Since there is only one driving device, the installation space for the driving device may be small, and the effective space (loading space for cargo) on the cargo bed can be increased accordingly.

  (3) Since the elevator floor is raised and lowered by one drive device, an interlocking synchronization system as in the case of raising and lowering by a plurality of drive devices (four in Patent Document 1) is not required. In addition, when moving up and down by a plurality of drive devices, if the synchronous operation becomes uneven, there arises a problem that a torsional action acts on the lift floor or the lift floor moves up and down in an inclined state. Then, such a problem can be solved beforehand.

  In the lorry with a lift floor according to claim 1, a hydraulic cylinder capable of moving the rope operation portion back and forth in the horizontal linear direction is adopted as a drive device, and the frame body is made of a frame material having a predetermined thickness as the lift floor. In addition to the above effects, the hydraulic cylinder (driving device) is installed within the vertical thickness range of the frame body on the bottom surface of the lift floor. There is an effect.

  (4) The installation space for the driving device may be narrow in the vertical direction, and the vertical space on the loading platform can be increased.

  (5) Since the drive device is installed using the surplus space (thickness range) of the lifting floor, the load space on the loading platform is not limited for the installation of the drive device (effective space is reduced). Can be wide).

  Further, in the lorry with a lift floor according to the first aspect of the present invention, since the down rope is provided to move the lift floor downward when the drive apparatus is operated to the lift floor lowering side, the drive apparatus is operated to the lower lift floor moving side. When this is done, there is also an effect that it can be surely moved down by the lower moving cable while maintaining the lifting floor in a horizontal posture.

[Effect of the invention of claim 2 of the present application]
The lorry with a lift floor according to claim 2 of the present application is for lifting the lift floor via a looping ring between the four corners of the lift floor and the respective upper positions of the four columns as in the case of claim 1. In the case where the four cables are interposed, the four cables can be lifted and lowered by pulling and feeding the two cables by two driving devices.

  Therefore, in the freight vehicle with an elevator floor according to claim 2, the number of driving devices used can be halved as compared with the conventional example using four driving devices (hydraulic cylinders). The weight of the entire device can be reduced (the weight of the load loaded on the loading platform can be increased), and the installation space for the driving device on the loading platform can be reduced (the loading space for the load can be increased).

  Also, since two drive units are used, an interlocking synchronization system for both drive units is necessary, but the two drive units are simpler and more erroneous than the interlocking synchronization system for four drive units. There is an effect that operation is difficult to occur.

  Further, in the lorry with a lift floor according to claim 2, a hydraulic cylinder capable of moving the rope operating portion back and forth in the horizontal linear direction is adopted as a drive device, and the frame body is made of a frame material having a predetermined thickness as the lift floor. And the hydraulic cylinder (driving device) is installed within the vertical thickness range of the frame body on the lower surface of the floor plate in the lifting floor. There are 4) and 5) effects.

  Further, in the lorry with a lift floor according to claim 2, since the down-motion rope for moving the lift floor downward when the drive device is operated on the lift floor lowering side is provided, the drive device is operated on the lower lift floor moving side. When this is done, there is an effect that it is possible to reliably move down the lifting floor while maintaining the horizontal position by the lower moving rope.

  An embodiment of the present application will be described with reference to the accompanying drawings. FIGS. 1 to 7 show a freight vehicle with an elevator floor according to the first embodiment, and FIGS. 8 to 10 show an elevator floor according to the second embodiment. An attached lorry is shown. The first embodiment shown in FIGS. 1 to 7 corresponds to claim 1 of the present application, and uses only one drive device 3 for lifting and lowering the floor. Moreover, 2nd Embodiment of FIGS. 8-10 respond | corresponds to Claim 2 of this application, and uses 2 units | sets as the drive device 3 for raising / lowering a raising / lowering floor.

[First Embodiment of FIGS. 1 to 7]
In this first embodiment of the lorry vehicle with an elevator floor, another cargo loading floor (elevating floor) 2 is installed on the cargo carrier's loading platform 1 so as to be movable up and down. 10 ... can be loaded.

  .. Are vertically provided at four corners of the loading platform 1. The upper portions of the four columns 11, 11,... Are connected by a rectangular connecting frame 12 (see FIGS. 6 and 7). In addition, you may enclose the upper part (the outer side of each support | pillar 11,11 ...) with a side plate, a top plate, etc. of the loading platform 1.

  Inside the four columns 11, 11,..., A lifting floor 2 having the same area as the loading platform 1 is arranged. The elevating floor 2 has its four corners respectively guided by the respective columns (four) 11, 11,... So that the elevating floor 2 can be raised and lowered in a horizontal posture.

  As shown in FIGS. 3 to 5, the lift floor 2 is configured such that a floor plate 23 is installed on the upper surface of a frame body 21 in which frame materials 21 a to 21 d are assembled. This elevating floor 2 uses frame materials 21a to 21d having an appropriate thickness (dimension H in FIG. 4, for example, a thickness of about 150 mm) as the frame body 21 so as not to be bent by the loaded luggage. ing. In a state where the floor plate 23 is installed on the upper surface of the frame body 21, a space 24 having a predetermined height H (about 150 mm) is formed in a portion surrounded by the frame body 21 on the lower surface of the floor plate 23. Between the left and right frame members 21a and 21b in the frame body 21, as shown in FIGS. 3 and 4, a narrow connecting bar 22 for attaching a hydraulic cylinder 3 and sheaves 6C, 6D, 8A, etc., which will be described later, is provided front and rear. It is attached at three places. Each of the connecting bars 22, 22, 22 is in a plate shape and is installed so that the lower surface thereof is at the same height as the lower surface of the frame body 21, and between the upper surface of each connecting bar 22 and the lower surface of the floor plate 23. Is formed with a considerably high interval (for example, about 130 to 140 mm).

  At the four corners of the elevator floor 2, notches for fitting the respective struts 11, 11,. In this embodiment, as shown in FIGS. 3 and 5, two sliding contact rollers 26 and 27 are provided at the four corners of the elevating floor 2 to be joined to the two surfaces of the columns 11, 11,. The four corners of the elevating floor 2 can be moved up and down smoothly with respect to the four columns 11, 11,. As a mechanism for guiding the four corners of the elevating floor 2 to the respective pillars 11, 11,... Instead of the two sliding contact rollers 26, 27 (joined to the two surfaces of the pillar 11), for example, Each of the support columns 11 may be provided with a vertically long guide groove, and at the four corners of the lifting floor 2 may be provided with rolling rollers that are fitted into the guide grooves.

  In this 1st Embodiment, as the lifting mechanism for lifting the raising / lowering floor 2, four uplifting ropes 5A-5D which respectively suspend the four corners of the raising / lowering floor 2, and each of these uplifting ropes 5A-5D are included. Each of the ropes 6A to 6D to be wound around and one drive device 3 for pulling in and feeding out each of the upward moving ropes 5A to 5D are provided. Moreover, in this 1st Embodiment, when this drive device 3 act | operates to the raising / lowering floor descent | fall side, the three downward moving ropes 7A-7C which forcibly move the raising / lowering floor 2 down, and each said lower moving rope 7A Ropes 8A to 8C around which? C is wound.

  Chains and wire ropes can be used as the above-mentioned upper moving cords 5A to 5D and lower-moving cords 7A and 7C, respectively, and sprockets and sheaves can be used as the respective ropes 6A to 6D and 8A to 8C. In this embodiment, a wire rope is used for each of the ropes 5A to 5D and 7A to 7C, while a sheave is used for each of the ropes 6A to 6D and 8A to 8C. In the following description, the ropes 5A to 5D and 7A to 7C may be referred to as wire ropes, and the rope hooks 6A to 6D and 8A to 8C may be referred to as sheaves.

  The driving device 3 employs a hydraulic cylinder. In the following description, the drive device 3 may be referred to as a hydraulic cylinder.

  In the first embodiment, one hydraulic cylinder 3 is used as a drive device. As shown in FIGS. 3 and 4, the hydraulic cylinder 3 is installed in a space portion 24 on the lower surface of the floor plate 23 in a substantially central portion of the elevating floor 2 in a front-rear orientation. The hydraulic cylinder 30 uses a tube 31 having a thickness of about 80 to 100 mm. In the hydraulic cylinder 3, the tube 31 is fixed on the two connecting bars 22 and 22 with the rod 32 facing the rear side of the loading platform 1. Therefore, the hydraulic cylinder 3 is accommodated within the thickness range (about 150 mm) of the frame 21 of the elevating floor 2. The hydraulic cylinder 3 is connected to a hydraulic hose (not shown) through a space 24 on the lower surface of the floor plate 23.

  At the tip of the rod 32 of the hydraulic cylinder 3, a rectangular bar-like moving body 4 is attached in a posture facing the width direction of the elevating floor 2. The movable body 4 has a considerable length that is slightly shorter than the inner surface spacing of the left and right frame members 21 a and 21 b of the frame body 21. The moving body 4 moves back and forth as the hydraulic cylinder 3 expands and contracts, and serves as a rope operation section for retracting and feeding the rope as will be described later. The moving body 4 may be guided so as to move back and forth while maintaining a horizontal posture.

  As shown in FIGS. 2, 3, and 6, the four wire ropes 5 </ b> A to 5 </ b> D for moving up and down the floor are respectively wound around as follows. The first wire rope 5A for upward movement is fixed at one end of the rope 5Aa on the right side of the center of the moving body 4, and the other end of the rope is extended to the front side of the vehicle so Further, after being wound around the first sheave 6A1 and the second sheave 6A2 attached to the right side of the front end of the lift floor 2, the other end of the rope 5Ab is fixed to the upper position of the column 11 at the front right position. The second wire rope 5B for upward movement has its one end 5Ba fixed to the center left side of the moving body 4, and the other end of the rope extends to the front side of the vehicle, and is attached to the center left side of the front end of the lift floor 2. After winding the first sheave 6B1 and the second sheave 6B2 attached to the left side of the front end of the lifting floor 2, the other end 5Bb of the rope is fixed to the upper position of the column 11 at the front left position. The third upward moving wire rope 5 </ b> C has a first end and a second end fixed to the central right side of the movable body 4 at one end of the rope 5 </ b> C and the other end of the rope attached to the connecting bar 22 on the front side of the movable body 4. 2 is wrapped around each sheave 6C1, 6C2 and extended to the rear side of the vehicle, and is wrapped around a third sheave 6C3 attached to the right side of the rear end of the lift floor 2, and then the other end 5Cb of the rope is moved to the rear right position. It fixes to the upper position of the support | pillar 11 in this. The fourth upward moving wire rope 5D has a first end and a first end fixed to the central left side position of the moving body 4 and the other end of the rope attached to the connecting bar 22 on the front side of the moving body 4. 2 is wrapped around each sheave 6D1, 6D2 and extended to the rear side of the vehicle and is wound around a third sheave 6D3 attached to the left side of the rear end of the lift floor 2, and then the other end 5Db of the rope is positioned at the rear left position. It fixes to the upper position of the support | pillar 11 in this.

  On the other hand, as shown in FIGS. 2, 3, and 6, the three wire ropes 7A to 7C for moving up and down the floor are respectively wound around as follows. The first downward moving wire rope 7A is fixed to the first sheave 8A1 in which one end 7Aa of the rope is fixed near the center of the moving body 4 and the other end of the rope is attached to the connecting bar 22 on the rear side of the moving body 4. The rope is further extended to the front side of the vehicle and wound around the second sheave 8A2 attached to the center of the front end of the lift floor 2, and the other end 7Ab of the rope 1 is fixed at a position closer to the center of the front end. The second lower wire rope 7B has a rope end 7Ba fixed to the right end of the moving body 4, and the other end of the rope is extended to the vehicle rear side and attached to the right side of the rear end of the lift floor 2. After being wound around 8B, the other end 7Bb of the rope is fixed to the rear end right position of the loading platform 1. The third downward moving wire rope 7C has a rope end 7Ca fixed to the left end of the moving body 4, and the other end of the rope is extended to the vehicle rear side and attached to the left side of the rear end of the lift floor 2. After being wound around 8C, the other end 7Cb of the rope is fixed to the left position of the rear end of the loading platform 1. In the first embodiment, one downward moving wire rope 7A to 7C is provided near the center on the front side of the vehicle (symbol 7A), and one on each of the left and right ends on the rear side of the vehicle (symbol 7B, 7C), but these downward moving wire ropes 7A to 7C are in a position that does not interfere with the loading and unloading work of the load 10 on the loading platform 1.

  As described above, in the freight vehicle with a lift floor according to the first embodiment, the four uplifting wire ropes 5 </ b> A to 5 </ b> D extended from the moving body 4 side are respectively sheaves 6 </ b> A <b> 2 and 6 </ b> B <b> 2 at the four corners of the lift floor 2. , 6C3, 6D3, the ends 5Ab, 5Bb, 5Cb, 5Db of the wire ropes for upward movement are fixed to the upper positions of the columns 11, 11,. The four corners (each sheave 6A2, 6B2, 6C3, 6D3) of the elevating floor 2 can be suspended by the wire ropes 5A to 5D for upward movement. Each of the upward moving wire ropes 5A to 5D and each of the downward moving wire ropes 7A to 7C is stretched in a tensioned state (a state without slackness), and when the moving body 4 moves back and forth as described later. The wire ropes for upward movement and downward movement immediately actuate the lifting floor 2 in a predetermined direction.

  And in the lorry with a raising / lowering floor of this 1st Embodiment, when the hydraulic cylinder 3 is the most contracted state, as shown in FIG.2, FIG.3, FIG.4 and FIG. The four uplifting wire ropes 5A to 5D are respectively extended (the length of the lift floor 2 is shortened), while the three downturning wire ropes 7A to 7C are drawn in respectively. (The length of the lift floor 2 becomes longer), and the lift floor 2 is lowered to a position where it is close to (or in contact with) the loading platform 1. On the other hand, when the hydraulic cylinder 3 is extended from the most contracted state, the moving body 4 moves to the rear side of the vehicle, and the four uplifting wire ropes 5A to 5D are respectively pulled in (the length of the lifting floor 2 portion is the length). On the other hand, the three downward moving wire ropes 7A to 7C are fed out (the length at the lifting floor 2 portion is shortened). At this time, each of the upward moving wire ropes 5A to 5D is drawn to the lifting floor 2 via the sheaves 6A2, 6B2, 6C3, 6D3 at the four corners of the lifting floor 2, so that the lifting floor 2 is moved to the support columns 11, 11. It will move up while maintaining the horizontal posture while being guided by 11. In the state in which the hydraulic cylinder 3 is extended to the maximum, the moving body 4 moves to the rear side of the vehicle to the position indicated by the chain line (reference numeral 4 ') in FIG. 2, FIG. 3, and FIG. The floor 2 can be raised to the position indicated by the chain line in FIG. 4 (the position indicated by reference numeral 2 ′) and the desired height position shown in FIG.

  Further, when the hydraulic cylinder 3 is reduced from the upward movement state of the lifting floor 2, the upward movement wire ropes 5A to 5D are loosened (fed out), while the downward movement wire ropes 7A to 7C are tensioned (pulled). Therefore, the elevating floor 2 can be reliably lowered while maintaining the horizontal posture.

  Thus, in the lorry with a lift floor according to the first embodiment, the lift floor 2 can be moved up and down by one hydraulic cylinder 3, so that each effect of claim 1 of the present application described above can be achieved. .

  In the lorry with a lift floor according to the first embodiment, when loading a load from an empty state, the loads 10 and 10 are sequentially placed on the lift floor 2 with the lift floor 2 lowered as shown in FIG. .. is loaded, the hydraulic cylinder 3 is extended, and the lifting floor 2 is moved up to a predetermined height together with the loads 10, 10,... (The lifting floor is denoted by 2 ', the hydraulic cylinder is denoted by 3', and the moving body is denoted by 4 ' The load is in the state of 10 '), and another load may be loaded on the opened loading platform 1. Further, when unloading the cargoes 10, 10,... On the lift floor 2 and the loading platform 1, they may be performed in the reverse order to the above loading procedure. In addition, in this 1st Embodiment, although the raising / lowering floor 2 moved up is supported only by the hydraulic cylinder 3, the raising / lowering floor 2 is supported by another mechanism (for example, four corners of each of the raising / lowering floor 2 and each support | pillar 11, 11... May be shared and supported by a locking mechanism or a support rod from above the loading platform 1.

[Second Embodiment of FIGS. 8 to 10]
The lorry with a lift floor according to the second embodiment uses two hydraulic cylinders (drive devices) 3 in the first embodiment. In the freight vehicle with an elevator floor according to the second embodiment, the loading platform 1, the columns 11, 11,..., The elevator floor 2 and the like are the same as those in the first embodiment.

  In the second embodiment, the two hydraulic cylinders 3 and 3 are placed at the center position in the width direction near the front and rear ends of the lift floor 2 respectively within the height range of the frame on the bottom surface of the floor plate 23 as in the first embodiment. It is installed in the space part. The front hydraulic cylinder 3 is installed to expand and contract toward the vehicle rear side, while the rear hydraulic cylinder 3 is installed to expand and contract toward the vehicle front side.

  Moving bodies 4 and 4 are attached to the rods of the front and rear hydraulic cylinders 3 and 3, respectively. A relatively short moving body 4 of the front hydraulic cylinder 3 is used, while a relatively long moving body 4 of the rear hydraulic cylinder 3 is used.

  The front hydraulic cylinder 3 moves up and down the front side of the lift floor 2 and includes two (first and second) up-motion wire ropes 5A and 5B and one (first) down-motion wire rope 7A. Pull-in / out operation. The hydraulic cylinder 3 on the rear side raises and lowers the rear side of the lifting floor 2 and includes two (third and fourth) uplifting wire ropes 5C and 5D and two (second and third). The downward moving wire ropes 7B and 7C are pulled in and extended.

  The four upward moving wire ropes 5A to 5D and the three downward moving wire ropes 7A to 7C are respectively installed as follows.

  The first upward moving wire rope 5A that suspends the front right corner of the lifting floor 2 has one end 5Aa of the rope fixed to the right end of the front moving body 4, and the other end of the rope extends to the front side of the vehicle. The rope is then wound around the first sheave 6A1 attached to the right side of the front end of the lift floor 2 and the second sheave 6A2 attached to the right side of the front end of the lift floor 2, and the other end 5Ab of the rope is moved to the front right position. It is fixed to the upper position of a certain column 11. The second wire rope 5B for upward movement that suspends the front left corner of the elevator floor 2 has one end 5Ba of the rope fixed to the left end of the front movable body 4, and the other end of the rope extends to the front side of the vehicle. After winding the first sheave 6B1 attached to the front left center of the elevator floor 2 and the second sheave 6B2 attached to the left side of the front edge of the elevator floor 2, the rope other end 5Bb is placed at the front left position. 11 is fixed to the upper position. The third upward moving wire rope 5C that suspends the rear right corner of the lift floor 2 fixes one end of the rope 5Ca to the position on the right side of the center of the rear moving body 4, and the other end of the rope to the rear side of the vehicle. After extending around the first sheave 6C1 attached to the center of the rear end of the elevating floor 2 and the second sheave 6C2 attached to the right side of the rear end of the elevating floor 2, the other end 5Cb of the rope is It fixes to the upper position of the support | pillar 11 in a rear right position. The fourth upward moving wire rope 5D that suspends the rear left corner of the lifting floor 2 fixes one end 5Da of the rope to the center left side position of the rear moving body 4, and extends the other end of the rope to the rear side of the vehicle. Wrap it around the first sheave 6D1 attached to the rear left center of the rear end of the lifting floor 2 and the second sheave 6D2 attached to the left side of the rear end of the lifting floor 2, and then the other end 5Db of the rope It fixes to the upper position of the support | pillar 11 in a position.

  On the other hand, the first downward moving wire rope 7 </ b> A for moving the front part of the lift floor 2 is fixed to the position closer to the center of the front moving body 4, and the other end of the rope is rearward of the front moving body 4. Wrapped around the first sheave 8A1 attached to the side and further extended to the front side of the vehicle and wrapped around the second sheave 8A2 attached to the center of the front end of the lift floor 2, the other end 7Ab of the rope 1 It is fixed at the center of the front end. The second downward moving wire rope 7B that moves the rear right corner of the lifting floor 2 is fixed to the right end of the rear moving body 4 and the other end of the rope is connected to the rear moving body 4 from the rear moving body 4. Wrap it around the first sheave 8B1 attached to the front side and extend it to the rear side of the vehicle and wrap it around the second sheave 8B2 attached to the right side of the rear end of the lift floor 2, and then attach the other end 7Bb of the rope to the loading platform. 1 is fixed at the right position of the rear end. The third downward moving wire rope 7 </ b> C that moves the rear left corner of the lifting floor 2 is fixed to the left end of the rear moving body 4 and the other end of the rope is in front of the rear moving body 4. Wrapped around the first sheave 8C1 attached to the side of the vehicle, and further extended to the rear side of the vehicle and wrapped around the second sheave 8C2 attached to the left side of the rear end of the lift floor 2, and then the other end 7Cb of the rope is connected to the loading platform 1 The rear end is fixed at the left position.

  Also in the case of the second embodiment, each of the upward moving wire ropes 5A to 5D and each of the downward moving wire ropes 7A to 7C is stretched in a tensioned state (a state without slack).

  In addition, in the freight vehicle with an elevator floor according to the second embodiment, an interlocking synchronization system for operating the front and rear hydraulic cylinders 3 and 3 in synchronization is used. The hydraulic cylinders 3 and 3 are extended and contracted in synchronization.

  And also in the case of this 2nd Embodiment, by extending and contracting both hydraulic cylinders 3 and 3 synchronously, similarly to the case of the said 1st Embodiment, each wire rope for moving upwards and each floor according to each sheave are moved up and down. It can be moved up and down while maintaining a horizontal posture.

  In this second embodiment, since the lifting floor 2 is moved up and down by two hydraulic cylinders 3 and 3, an interlocking synchronization system for both hydraulic cylinders 3 and 3 is necessary, but there are two hydraulic cylinders 3 and 3. Therefore, the configuration of the interlocking synchronization system is simpler and malfunctions are less likely to occur than in the case where the four hydraulic cylinders are used to raise and lower the four corners of the lifting floor as in Patent Document 1, respectively.

  Also in the second embodiment, since the three descending ropes 7A to 7C for forcibly lowering the lifting floor 2 when the driving device 3 is operated to the lifting floor lowering side are provided. The above-described effects can be achieved by the lower moving ropes 7A to 7C.

It is a side view of the lorry with a raising / lowering floor of a 1st embodiment of this application. It is an II-II arrow line view of FIG. It is a partially deleted enlarged view in a state in which the floor board is omitted from the lift floor in FIG. It is IV-IV sectional drawing of FIG. FIG. 4 is a partially enlarged perspective view of FIG. 3. It is a perspective view for explanation of a raising / lowering mechanism in a 1st embodiment (a raising / lowering floor lowering state). It is a state change figure (moving state on a raising / lowering floor) from FIG. It is the FIG. 2 equivalent view of the lorry with a raising / lowering floor of 2nd Embodiment of this application. It is a perspective view for explanation of a raising / lowering mechanism in a 2nd embodiment (a raising / lowering floor moving state). It is a state change figure from FIG. 9 (moving state on a raising / lowering floor).

  DESCRIPTION OF SYMBOLS 1 is a loading platform, 2 is a raising / lowering floor, 3 is a drive device (hydraulic cylinder), 4 is a moving body, 5A-5D is a rope for upward movement (wire rope for upward movement), 6A-6D is a rope (sieve), 7A- 7C is a cable for downward movement (wire rope for downward movement), 8A to 8C are ropes (sheaves) 11 are columns, 21 are frames, 23 are floor boards, and 24 is a space.

Claims (2)

Support pillars (11, 11,...) Are respectively erected at the four corners of the cargo truck (1), and the four corners of the lift floor (2) are guided by the four pillars (11, 11,...). A lorry with an elevating floor in which an elevating floor (2) is installed on the cargo bed (1) so as to freely move up and down.
Four for lifting the lifting floor via rope rings (6A to 6D) between the four corners of the lifting floor (2) and the respective upper positions of the four columns (11, 11,...). Through the cable (5A-5D)
The lifting / lowering floor (2) can be moved up and down by drawing and feeding the four cables (5A to 5D) with one driving device (3),
While the driving device (3) employs a hydraulic cylinder (3) capable of moving the rope operating section (4) for retracting and feeding the rope (5A to 5D) in a horizontal linear direction,
The elevating floor (2) uses a floor plate (23) installed on the upper surface of a frame body (21) made of a frame material having a predetermined thickness above and below,
Installing the hydraulic cylinder (3) within the thickness range of the frame (21) on the lower surface of the floor plate (23);
Between the drive device (3) and the front and rear positions of the loading platform (1), the drive device (3) moves down the lift floor (2) when operated on the lift floor lower side. At least one lower moving cable (7A-7C) is interposed between
A lorry with an elevating floor characterized by that. Support pillars (11, 11,...) Are respectively erected at the four corners of the cargo truck (1), and the four corners of the lift floor (2) are guided by the four pillars (11, 11,...). A lorry with an elevating floor in which an elevating floor (2) is installed on the cargo bed (1) so as to freely move up and down.
Four for lifting the lifting floor via rope rings (6A to 6D) between the four corners of the lifting floor (2) and the respective upper positions of the four columns (11, 11,...). Through the cable (5A-5D)
The lifting and lowering floor (2) can be moved up and down by drawing and feeding out the four ropes (5A to 5D) by two driving devices (3, 3), respectively,
While the driving device (3) employs a hydraulic cylinder (3) capable of moving the rope operating section (4) for retracting and feeding the rope (5A to 5D) in a horizontal linear direction,
The elevating floor (2) uses a floor plate (23) installed on the upper surface of a frame body (21) made of a frame material having a predetermined thickness above and below,
Installing the hydraulic cylinder (3) within the thickness range of the frame (21) on the lower surface of the floor plate (23);
Between the drive device (3) and the front and rear positions of the loading platform (1), the drive device (3) moves down the lift floor (2) when operated on the lift floor lower side. At least one lower moving cable (7A-7C) is interposed between
A lorry with an elevating floor characterized by that.

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