JP3688626B2 - Tailgate lift in lorry - Google Patents

Description

[0001]
【Technical field】
The present invention relates to a tailgate lift that is attached to a truck such as a truck and is used when loading / unloading a load onto / from a loading platform, and in particular, by turning a pair of main arms supported by a chassis frame. And a tailgate lift that raises the tailgate at a raised position and accommodates it along the rear surface of a container or the like.
[0002]
[Background]
Conventionally, in a truck such as a truck, in order to simplify the loading and unloading work on a container mounted on a chassis frame, a tailgate that can be raised and lowered at the rear part of the loading platform (referred to as a table or a platform). A tailgate lift with the same is used hereinafter) is used. Also, as a kind of such tailgate lift, it is arranged to extend from the turning center axis extending in the vehicle width direction at the rear part of the chassis frame of the lorry toward the rear of the vehicle, and can turn around the turning center axis. A plate-like tailgate is attached to the tip of the pair of left and right main arms supported by the base, and the tailgate is lifted and lowered by rotating the pair of main arms with a lifting drive source. The gate is supported substantially horizontally at the same height as the floor plate behind the floor plate of the container or the like mounted on the chassis frame, and the tail gate is grounded in the lowered position, while the tail gate is in the raised position. Is rotated with respect to the pair of main arms by an opening / closing drive source, and is substantially vertical along the rear surface of the container etc. from a substantially horizontal open position. Rises are known those which can accommodate the structure by allowed to hold lead in the closed position, is subjected to practical use widely from such that the structure is simple.
[0003]
By the way, as one of the important points in such a tailgate lift, when the tailgate is horizontally placed at the raised position and disposed behind the floor plate of the container or the like, the front edge of the tailgate is placed on the container or the like. There is a viewpoint as to whether or not it is possible to approach the rear edge of the floor board as much as possible. If there is a large gap between the front edge of the tailgate and the rear edge of the floor plate of the container, etc. Because it becomes.
[0004]
However, in such a tailgate lift, when the tailgate is accommodated, the tailgate is supported near the front end edge with the tailgate placed horizontally behind the floor of a container or the like as described above. Since it is designed to be turned up at the position, it may be difficult to bring the front edge of the tailgate sufficiently close to the rear edge of the floor plate such as a container in a horizontal state. It was.
[0005]
In other words, when the tailgate is raised with the front edge of the tailgate being close to the rear edge of the floor plate of the container or the like, the front end of the tailgate may be affected depending on the position of the vertical rotation shaft of the tailgate. There is a risk that the edge may be caught by the rear edge of the floor plate of the container or the like, causing trouble. In addition, when the tailgate is stowed and stored, the rear door of the container and its locking mechanism may be protruded rearward of the container. For example, it is used as a double-folding rear door of many cargo truck containers. In the lock rod type locking mechanism that extends in the vertical direction, the lock rod escapes to the side of the container when the door is open, so the front edge of the leveled tailgate is the rear edge of the container floor plate. Although the lock rod protrudes from the container rear door by closing the door, the rear edge of the container floor plate in the horizontal state as described above. When the tailgate that was positioned close to the stand was raised at this close position, the tailgate would interfere with the lock rod. It is.
[0006]
In order to deal with such a problem, at present, a transfer plate (groove plate) is attached to the rear edge of the container so as to be rotatable with a hinge or separately prepared so as to be removable. In the loading / unloading operation, the tail plate and the container floor plate are covered with a transfer plate. However, in the loading / unloading operation using such a transfer plate, it is necessary to increase the weight in order to ensure strength. It is very cumbersome to use because it requires the manual rotation of the plate or the work of attaching and detaching it. Moreover, the transfer plate runs a load of several hundred kilometers. There was a risk of deformation, and it was not satisfactory at all.
[0007]
[Solution]
Here, the present invention has been made in the background as described above, and the problem to be solved is that there is a protrusion behind the container or the like, such as a lock rod of a double door rear door. Therefore, in a lorry where the tailgate cannot be stowed up and close enough, the tailgate can be stowed up and stored, while the front edge of the tailgate is placed at the rear edge of the floor plate of a container or the like during cargo handling work. It is an object of the present invention to provide a tailgate lift having a novel structure capable of keeping a gap between a floor plate of a container or the like and a tailgate small by making the parts sufficiently close to each other.
[0008]
[Solution]
Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized on the basis of.
[0009]
  That is, the first aspect of the present invention is arranged to extend from the rotation central axis extending in the vehicle width direction toward the rear of the vehicle at the rear part of the chassis frame of the lorry and rotate about the rotation central axis. A plate-like tailgate is attached to the tip of a pair of left and right main arms that are supported so that the pair of main arms can be moved up and down by a lifting drive source to move the tailgate up and down. The tailgate is supported substantially horizontally at the same height as the upper surface of the floorboard behind the floorboard of the container or the like mounted on the chassis frame, and the tailgate is grounded at the lowered position. The tailgate is rotated with respect to the pair of main arms by the opening / closing drive source at the raised position so that the tailgate extends from the substantially horizontal open position along the rear surface of the container or the like. In tailgate lift in lorry that can accommodate By allowed to hold lead in the closed position to stand up vertically,
  By restricting the pivot end on the ascending side of the main arm, a lifting end that does not reach the maximum ascending end that is supported substantially horizontally at the same height as the upper surface of the floor plate behind the floor plate of the container or the like is set. A lifting stopper member that is releasable, the rising position of the main arm can be selected and set at the maximum rising end and the lifting lift end, and the tail gate is guided to the closed position at the lifting lift end. Is kept upright and spaced apart from the rear surface of the container or the like by a predetermined amount.Do,
  A link mechanism comprising a plurality of link members for connecting the tailgate to the chassis frame so as to be movable up and down on both sides in the vehicle width direction of the tailgate is constituted by a plurality of link members including the main arm. In addition, the holding stopper member is disposed so as to be detachable between the opposed surfaces of the link frame and the chassis frame at the position of the rotating end of any one of the link members.
  Further, when any one of the link members constituting the link mechanism is brought into contact, a main stopper that defines the maximum rising end of the main arm is fixed to the chassis frame, and the main stopper The stopper member can be inserted and removed on the contact surface of the link member.Features a tailgate lift.
[0010]
In such a tailgate lift in a lorry structured according to this aspect, the tailgate ascending position is set in two stages of the maximum ascending end and the ascending ascending end by setting / releasing the retaining stopper member. Will be. The tailgate that can be moved up and down based on the pivoting operation of the main arm is positioned below the maximum rising end by a predetermined amount and positioned behind the container or the like by a predetermined amount. It becomes. Therefore, at the maximum rising end, the tailgate held in a horizontal state can be positioned sufficiently close to the rear surface of the container or the like, while at the lifting upper end, the tailgate is rearward from the rear surface of the container or the like by a predetermined amount. The opening / closing operation is performed at a separated position.
[0011]
Therefore, in the tailgate lift according to this aspect, in a cargo vehicle in which protrusions such as lock rods that do not exist during cargo handling work are present on the rear end surface of the container or the like when the tailgate lift is accommodated, The front edge of the tailgate that is set at the maximum rising edge and is almost level with the floor plate of the container, etc. is sufficiently close to the rear edge of the floor plate of the container, etc., allowing a gap between them. The main arm is set at the lifted end when the tailgate is received after the cargo handling operation is completed, and the tailgate is positioned away from the rear end surface of the container etc. The tailgate can be raised and held at the position where the protrusions of the And improvement in workability unload luggage to the container or the like, is the containment of the tailgate can be highly achieved both.
[0012]
The scope of application of this aspect is not limited to container-type lorries equipped with double doors with a lock rod, but the front edge of the tailgate is close when the tailgate is closed. Of course, the present invention can be applied to various types of lorries that are required to avoid protrusions that protrude rearward from the rear edge of the floor plate that is positioned and opposed to each other. Also, a known hydraulic cylinder, pneumatic cylinder, electric drive source, or the like may be appropriately employed as the main arm raising drive source or tailgate opening / closing drive source. In this embodiment, the ascending position of the main arm includes a position where the ascending end of the main arm is set as the maximum ascending end and a position where the ascending end is set as the lifting end. Is done.
[0013]
  Also,BookIn the aspect, by adopting an appropriate link mechanism including a plurality of link members, a tailgate support structure corresponding to the stability and load resistance of the tailgate can be easily realized with a large degree of design freedom. Further, by restricting the rotation position of an appropriate link member constituting such a link mechanism with a holding stopper member, the lifting end of the tailgate can be set with a simple structure. By inserting / removing, the rising position of the tailgate can be easily and quickly switched to either the maximum rising end or the lifting rising end. As the link mechanism employed in this aspect, for example, a three-bar link mechanism as disclosed in Japanese Patent Laid-Open No. 11-59255, a four-bar link mechanism as disclosed in Japanese Utility Model Publication No. 6-44749, and the like are advantageous. Can be applied to.
[0014]
  Also,BookIn the aspect, the main stopper and the holding stopper member that selectively set the rising position of the tailgate to the maximum rising end and the holding up end by the contact of the link member are both directly or indirectly supported by the chassis frame. Therefore, the load resistance strength of the main stopper and the retaining stopper member defining the raised positions can be advantageously ensured.
[0015]
  In addition, the first of the present inventiontwoThe aspect of the aboveoneThe tailgate lift in the lorry according to the above aspect is supported so as to be rotatable around a second rotation center axis that is located above the rotation center axis and is disposed in parallel with the rotation center axis. The left and right pair of tension arms are disposed above the pair of left and right main arms, and the tension arms and the tip portions of the main arms are connected by connecting headers, whereby a four-bar linkage mechanism is provided on each of the left and right sides. On the other hand, the tailgate is mounted between the left and right connecting headers, and the left and right connecting headers are connected to each other by the tailgate and supported by the left and right connecting headers. The tailgate is rotatably supported around a third rotation center axis extending in the vehicle width direction parallel to the rotation center axis and the second rotation center axis. That it was provided with the copy stopper member so as to be brought into contact with the said tension arm, characterized. In this aspect, the truck according to the second or third aspect can be advantageously realized.
[0016]
  In addition, the first of the present inventionthreeThe aspect of the aboveOne or secondIn the tailgate lift in the truck according to the aspect, the state where the main arm is positioned at the maximum rising end without being defined by the holding stopper member by being pulled out and held in the retracted position. A safety means for preventing the tail gate from being raised to the closed position by the opening / closing drive source is provided below. In such a mode, since the start-up operation to the closed position is prevented while the main arm is positioned at the maximum ascending end, for example, in a state where the tailgate is held at the maximum ascending end. Interference and damage to the rear edge of the floor plate of the container or the like at the front edge of the tailgate and the protrusion protruding therefrom can be prevented due to the erroneous start to the closed position. Such a safety means can be realized by either a mechanical mechanism or an electrical mechanism. For example, the safety means by an electrical mechanism is assembled with a sensor such as a limit switch for detecting the retracted position of the stopper member. Thus, it can be realized by an electric circuit or the like that invalidates the switch operation of the tailgate start-up operation in a state where the holding stopper member is held at the retracted position.
[0017]
  In addition, the first of the present inventionFourThe aspect of the abovethreeIn the tailgate lift in the freight vehicle according to the aspect of the invention, the insertion / removal operation of the holding stopper member is manually performed, and the stopper is removed and held at the retracted position in conjunction with the insertion / removal operation of the holding stopper member. Under the condition, a cover plate that covers the switch of the opening / closing drive source for raising the tailgate to the closed position and operating it is adopted as the safety means. In this embodiment, the safety means can be realized with a simple mechanical structure, whereby the tailgate lift structured according to the fifth aspect can be easily realized with a simple structure.
[0018]
  In addition, the first of the present inventionFiveThe first to the second aspectsFourIn the tailgate lift in a truck according to any one of the above aspects, the container or the like has a double door rear door, and a lock rod that locks the rear door so that it cannot be opened is a rear door of the container or the like. The front edge of the tailgate supported horizontally at the maximum rising end of the main arm is the rear end of the floor plate of the container or the like where the rear door is opened. While being guided to a position close to the edge, the tailgate raised at the lifted end of the main arm is at least a protruding amount of the lock rod with respect to the rear surface of the container or the like that closed the rear door It is characterized in that it can be spaced apart rearward only. In such a mode, the tailgate is raised and separated from the rear surface of the container or the like with the double door rear door closed at least by the amount of protrusion of the lock rod and held in the accommodated state. Therefore, it is possible to accommodate the tailgate avoiding the lock rod, and when opening the double doors, the front edge of the tailgate held in a horizontal state is placed against the rear edge of the floor plate of the container. Since the gap between the two can be made sufficiently small, the workability of loading and unloading the luggage can be improved.
[0019]
  In addition, the first of the present inventionSixThe aspect of the aboveFiveIn the tailgate lift in a lorry structured according to the above aspect, a front end edge of the tailgate is provided with a notch at the front end edge of the tailgate and horizontally supported at the maximum state end of the main arm. It is characterized in that the engaging portion of the lock rod that protrudes rearward from the floor plate of the container or the like is escaped by the cutout portion. In such an aspect, when the tailgate is placed in a horizontal state at the maximum rising end and is brought close to the rear edge of the floor plate of the container or the like, the rear end surface of the floor plate of the container or the like to which the tail gate is brought close to and opposed to each other Even when the locking part protrudes from the front edge of the tailgate, the notch provided at the front edge of the tailgate avoids contact with the locking part so that the front edge of the tailgate can be It is possible to make it sufficiently close to the rear edge of the floor board such as the like, and the gap between them can be kept small.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.
[0021]
1 and 2 show a tailgate lift 10 as an embodiment of the present invention. The tailgate lift 10 includes a base unit 12, an arm unit 14, and a platform 16 as a tailgate, and is attached to a rear portion of a chassis frame 20 in a transport truck 18 as a lorry so that the transport truck It is used when loading / unloading a cargo onto / from a container 24 placed on 18 loading platforms 22. In the following description, in principle, the vertical direction of the vehicle and the longitudinal direction of the vehicle refer to the vertical direction and the horizontal direction in FIG. 2, and the clockwise direction and the counterclockwise direction refer to FIG. The clockwise direction and the counterclockwise direction in FIG.
[0022]
More specifically, the base unit 12 includes a rod-shaped shaft 26 disposed so as to extend in the vehicle width direction at the rear portion of the chassis frame 20, a first hydraulic cylinder 28 coupled to the shaft 26, The base frame 30 is configured to hold the shaft 26 and the first hydraulic cylinder 28 at the rear part of the chassis frame 20. The base frame 30 has a substantially U-shape in a plan view, and has a pair of side wall portions 32, 32 having a substantially rectangular flat plate shape opposed to each other with a predetermined separation distance in the vehicle width direction, 32, a rear wall portion 34 having a substantially rectangular flat plate shape straddling between the respective rear end portions, and is fixed to the rear portion of the chassis frame 20 via a mounting member or the like (not shown). They are opposed to each other with a predetermined separation distance in the vertical direction (vertical direction in FIG. 2).
[0023]
Further, the shaft 26 is disposed across the opposing surfaces of the both side wall portions 32, 32 on the vehicle front side (left side in FIG. 2), and both end portions of the shaft 26 are formed on the both side wall portions 32, 32. By being supported without penetrating and sticking, the base frame 30 is supported so as to be rotatable. The shaft 26 protrudes from the chassis frame 20 toward the lower side of the vehicle, and penetrates a support plate (not shown) disposed between the side wall portions 32 and 32 in parallel with the side wall portion 32 and is not fixed. It is supported in a state and is also rotatably supported with respect to the chassis frame 20.
[0024]
Furthermore, the first hydraulic cylinder 28 includes a cylinder portion 36 and a rod 38 that advances and retreats from the cylinder portion 36, and one end side of the cylinder portion 36 is adjacent to the rear wall portion 34. In the oblique state in which the other end side of the cylinder portion 36 is positioned above the side wall portion 32 positioned in front of the vehicle, the cylinder portion 36 is positioned at a substantially intermediate portion between the opposing surfaces of the side wall portions 32 and 32. One end is supported by the side wall portions 32, 32 and the like via the pivot 37, so that the base frame 30 is rotatably supported. The rod 38 is advanced and retracted obliquely upward in front of the vehicle. It has become so.
[0025]
Further, a pair of connecting pieces 40 are welded to a substantially middle portion of the shaft 26 in the longitudinal direction. And the front-end | tip of the rod 38 in the 1st hydraulic cylinder 28 is latched with respect to the pivot 42 arrange | positioned ranging between the protrusion front-end | tip parts of this pair of connection pieces 40 and 40, and extending in parallel with the shaft 26. ing. As a result, the base unit 12 including the shaft 26, the first hydraulic cylinder 28 and the base frame 30 drives the rod 38 forward and backward by the cylinder portion 36 of the first hydraulic cylinder 28, so that the shaft 26 is rotated around the central axis. It is designed to reciprocate.
[0026]
The arm unit 14 includes a pair of link mechanisms 44, 44. The link mechanisms 44 are juxtaposed in the vehicle width direction at the rear portion of the chassis frame 20, and both the link mechanisms 44. , 44 is connected to the base unit 12, while the other tip ends of the link mechanisms 44, 44 are connected to a platform 16, which will be described later, between the base unit 12 and the platform 16. It is built in.
[0027]
The link mechanism 44 includes a link arm 46, a tension arm 48, an operating piece 50, and a link substrate 52 as main arms. The operating piece 50 has a structure in which a pair of flat plate-like substrates are opposed to each other with a predetermined gap, and the tip of the shaft 26 that protrudes outward in the vehicle width direction from the side walls 32, 32 of the base frame 30. The portion is made to penetrate both the substrates, and is fixed to the shaft 26 by welding or the like, so that it is rotated integrally with the shaft 26.
[0028]
Further, the link arm 46 has a substantially rectangular long rod shape, and one end portion of the link arm 46 is inserted into a gap between the operation pieces 50 formed of a pair of substrates, and is supported by the operation pieces 50 (a pair of substrates). In addition, it is rotatably supported by the operating piece 50 via a pivot 54 extending in parallel with the shaft 26. Further, the operating piece 50 is provided with a receiving piece 56 across the opposing surfaces of the pair of substrates, and the lower end portion of the link arm 46 is supported by the receiving piece 56. Thereby, the link arm 46 is rotated integrally with the shaft 26 together with the operating pieces 50 and 50 by restricting the downward rotation end around the operating piece 50 by the receiving piece 56. Yes. Each tip portion of the shaft 26 protrudes from the side wall portion 32 of the base frame 30 by a predetermined length outward in the vehicle width direction, and the operating piece 50 is fixed to each protruding tip portion of the shaft 26. As a result, the operating piece 50, by extension, the link arm 46 and the side wall portion 32 of the base frame 30 are opposed to each other with a predetermined separation distance in the vehicle width direction.
[0029]
The tension arm 48 has a bent flat plate shape in which two flat plates having different outer shapes are joined by welding or the like, and the side wall portion 32 of the base frame 30 and the link arm 46 (operating piece 50) are opposed to each other. It is provided substantially parallel to the link arm 46 and the side wall portion 32 between the surfaces, and is located above (in FIG. 2, upward) the shaft 26 and the pivot 54 of the operating piece 50 in the side wall portion 32 of the base frame 30. One end of the tension arm 48 is rotatable through a pivot 58 that is supported by the shaft 26 and extends in parallel with the shaft 26.
[0030]
Furthermore, each end of the link arm 46 and the tension arm 48 opposite to the connection portion with the base frame 30 (the operating piece 50) is connected to the link substrate 52. The link substrate 52 has a substantially U-shaped cross section, and is opposite to the connection portion of the link arm 46 and the tension arm 48 to the base frame 30 between the opposing surfaces of the pair of side walls separated in the vehicle width direction. Each end portion is inserted, and the end portion of the link arm 46 is rotatably connected via a first pivot 60 that is provided close to the bottom wall of the link substrate 52 and supported by both side walls. In addition, the end portion of the tension arm 48 is rotatably connected via the second pivot shaft 62 supported by the both side walls at a position farther from the bottom wall of the link substrate 52 than the first pivot shaft 60. . The first and second pivots 60 and 62 are disposed on the link substrate 52 so as to extend in parallel with the shaft 26. Accordingly, the tension arm 48 is rotated around the pivot 58 of the base frame 30 in association with the link arm 46 via the base frame 30 and the link substrate 52.
[0031]
In short, in the present embodiment, the link mechanism 44 includes a plurality of link members including the link arm 46 and the tension arm 48, the operating piece 50 and the link substrate 52, and further includes the side wall portion 32 of the base frame 30. When the first hydraulic cylinder 28 in the base unit 12 is driven to reciprocately rotate the shaft 26, the joint link mechanism is configured to rotate in the vertical direction of the vehicle as the operating piece 50 rotates. It is like that. As is clear from this, the rotation center axis extending in the vehicle width direction at the rear portion of the chassis frame 20 is constituted by the shaft 26, and is disposed above the rotation center axis and is tensioned. A second rotation center axis that rotatably supports the arm 48 is constituted by a pivot 58 that is supported by the base frame 30. Further, a lifting drive source for rotating the pair of link arms 46, 46 and thus the pair of link mechanisms 44, 44 includes the first hydraulic cylinder 28.
[0032]
  The pair of left and right link mechanisms 44, 44 are arranged to extend from the shaft 26 extending in the vehicle width direction at the rear portion of the chassis frame 20 toward the rear of the vehicle so as to be rotatable around the central axis of the shaft 26. The platform 16 is attached to the tip portions of the link mechanisms 44 and 44 so as to expand in the vehicle width direction. The platform 16 has a substantially rectangular flat plate shape (in other words, a plate shape). One surface of the platform 16 is used as a loading surface 64 of the load, and if necessary, unevenness and protrusion / A stopper for preventing drop of the retractable loaded luggage is provided, and the other surface is an operation surface 68 having a pair of gate frames 66 and 66. These gate frames 66 and 66 have a substantially flat box shape that opens toward one side edge of the operating surface 68 and has a space inside, and are mutually connected to the operating surface 68 in the vehicle width direction. They are arranged side by side apart. And one side edge of the working surface 68 in the platform 16Part isThe pair of link substrates 52 and 52 connected to the other end of the arm unit 14.so,The second pivot 62 is supported so as to be rotatable.. As a result, the platform 16 is connected to the arm unit 14 including the pair of link mechanisms 44, 44, and is arranged to extend outward from the rear portion of the loading platform 22 of the transport truck 18. As is clear from the above description, the link header 52 and the link substrate 52 are connected headers that connect the tip portions of the link arm 46 and the tension arm 48 on the opposite side to the connection portion of the base frame 30. It is comprised including the one side edge part of the platform 16 to which it adheres.
[0033]
  A second hydraulic cylinder 70 is accommodated in either one of the pair of left and right gate frames 66, 66. The second hydraulic cylinder 70 includes a cylinder portion 72 and a rod 74 that is driven forward and backward from the cylinder portion 72, and one end side of the cylinder portion 72 is positioned near the bottom wall portion of the gate frame 66. On the other hand, since the other end side of the cylinder portion 72 is positioned in the vicinity of the operating surface 68, the cylinder portion 72 is accommodated in the gate frame 66 in an inclined state with respect to the platform 16 (operating surface 68). Among these, the cylinder part 72 has one end.,Via a pivot 76 extending in the vehicle width direction, Against link substrate 52It is attached so as to be rotatable, and has a structure in which the rod 74 is advanced and retracted from the other end side. Further, the tip of the rod 74 is rotatably attached to a bracket 80 fixed to the operating surface 68 via a pivot 78. The bracket 80 has a substantially U-shaped cross section, is attached with the bottom fixed to the operating surface 68 of the platform 16, and the pivot 78 is attached between both wall portions of the bracket 80. The pivot 78 has a structure in which the tip of the rod 74 is connected.
[0034]
  As a result, the platform 16 including the pair of gate frames 66 and 66 in which the second hydraulic cylinder 70 is accommodated and disposed inside either the left or right side advances the rod 74 by the cylinder portion 72 of the second hydraulic cylinder 70. When retracted, this forward / backward movement is converted into a rotational motion by the bracket 80 via the pivot 78, and is reciprocated around the second pivot 62 on the link substrate 52 along with the rotational motion of the bracket 80. It becomes. That is, when the rod 74 is projected from the cylinder portion 72, the bracket 80 is gradually moved obliquely upward of the platform 16 in conjunction with the projection of the rod 74.Pressed2, the platform 16 is rotated counterclockwise around the second pivot 62 of the link substrate 52, while the rod 74 is moved into the cylinder portion 72, as shown in FIG. As it is gradually pulled, the bracket 80 gradually moves diagonally below the platform 16.PulledThe platform 16 is rotated clockwise around the second pivot 62 on the link board 52. In the present embodiment, although not particularly illustrated, the platform 16 is restricted from rotating more than a predetermined rotation angle on the inner peripheral surface and the operation surface 68 of the gate frame 66 in the platform 16. A rotation restricting member is provided, and the platform 16 is set in the second position on the link substrate 52 by appropriately setting the disposition position, shape, size, etc. of the rotation restricting member and other members to be disposed. It is designed to be turned around the pivot 62. As is apparent from this, in the present embodiment, the third rotation center axis for rotatably supporting the platform 16 extending in the vehicle width direction supported by the left and right link substrates 52, 52 is provided on both links. A pair of second pivots 62 and 62 in the substrates 52 and 52 are configured.
[0035]
In particular, in the present embodiment, a stopper unit 82 is disposed between the opposing surfaces of the base unit 12, that is, the arm unit 14 and the chassis frame 20. As shown in FIG. 3, the stopper unit 82 includes a stopper arm 84 having a substantially U shape or a U shape in a plan view, an operating rod 86 connected to the stopper arm 84, and a chassis frame. A pair of first stopper blocks 88 and 88 as main stoppers fixed to 20 are included. The stopper arm 84 has a rod-shaped horizontal portion 90 extending in the vehicle width direction at a substantially middle portion of the wheel base of the transport truck 18 and the vehicle rearward (rightward in FIG. 3) from both end portions of the horizontal portion 90. A pair of rod-like extending portions 92, 92 extending straight to the vicinity of the edge of the chassis frame 20 is provided, and the extending portion 92 has a substantially U-shaped cross section or a cylindrical cross section. By being suspended and supported by the chassis frame 20 through a plurality of brackets 94 having insertion holes, the chassis frame 20 is supported so as to be movable in the vehicle front-rear direction (left-right direction in FIG. 3). The chassis frame 20 is opposed to the vehicle frame with a slight separation in the vertical direction of the vehicle.
[0036]
  In addition, a second stopper block 96 as a retaining stopper member is fixed to a protruding tip end portion of each extending portion 92 that extends rearward of the vehicle in the stopper arm 84. The second stopper block 96 has a flat plate shape or a block shape as a whole. The upper end surface of the second stopper block 96 is substantially flat, while the second stopper block 96 has a bottom surface. The end surface has a substantially flat shape, and one end (rear side of the vehicle) of the lower end surface is chamfered. The second stopper block 96 is,It is disposed between the tension arm 48 of the link mechanism 44 and the facing surface of the chassis frame 20.
[0037]
Further, a pair of first stopper blocks 88 and 88 are disposed between the opposing surfaces of the stopper arm 84 and the chassis frame 20. These first stopper blocks 88 and 88 have a block shape or a flat plate shape, and are fixed to the chassis frame 20 so as to face each other with a predetermined separation distance in the vehicle width direction at the rear portion of the chassis frame 20. Projecting from the chassis frame 20. Further, particularly in the present embodiment, the first stopper block 88 is disposed above the second stopper block 96, and the second stopper block 96 is fixed to the first stopper block 88. They are superimposed so that they can move relative to each other.
[0038]
In addition, an action block 98 is disposed at a substantially middle portion of the horizontal portion 90 of the stopper arm 84. The action block 98 has a downward concave groove shape having a guide groove 100 on the inner peripheral surface, and the bottom of the action block 98 is fixed to the lower surface of the horizontal portion 90 by welding or the like. In addition, a working bolt 102 having a large-diameter sliding head is engaged with the guide groove 100 of the working block 98 in such a manner as to be slidable and displaceable in the axial direction of the horizontal portion 90 (the working block 98). A tip portion of the working bolt 102 engaged with the groove 100 extending downward from the sliding head is inserted into the insertion hole 106 of the connecting plate 104 having a substantially rectangular flat plate shape and fixed with a nut. 104 is disposed integrally with the action bolt 102 so as to be displaceable with respect to the guide groove 100 of the action block 98.
[0039]
Furthermore, an operating rod 86 is fixed to the end of the connecting plate 104 opposite to the connection site with the working bolt 102. The operation rod 86 has a bent rod shape, one end is fixed to the outer peripheral edge of the connecting plate 104 by welding or the like, and the other end is a side edge of the chassis frame 20. A grip 108 is arranged near the chassis frame 20 and the ground and extends straight in the vertical direction of the vehicle. The chassis frame 20 is fixedly provided with a first support plate 110 and a second support plate 112 that support the lower end 109 of the operation rod 86. Each of the first and second support plates 110 and 112 has a substantially bent flat plate shape, and upper wall portions 114 and 116 that extend straight from the chassis frame 20 toward the vehicle lower side. The wall portions 114 and 116 are configured to include lower wall portions 118 and 120 extending from the downward projecting front end portions of the wall portions 114 and 116 toward the rear of the vehicle. The first support plate 110 includes an operation rod. 86, the lower end portion 109 of the operating rod 86 is placed on the lower wall portion 118 of the first support plate 110, and a part of the operating rod 86 is supported by being suspended. On the other hand, the second support plate 112 is positioned at an intermediate portion between the action bolt 102 and the grip 108 of the operation rod 86, and the operation rod 86 is placed on the lower wall portion 120 of the second support plate 112. And placing the end 109, is suspended part of the operating rod 86 supporting allowed. In particular, a fulcrum bolt 122 protrudes upward in the axial direction on the lower wall portion 120 of the second support plate 112 and passes through the operation rod 86, and rotates relative to the operation rod 86. Displaceable.
[0040]
As a result, the stopper arm 84 connected to the operation rod 86 has the gripping portion 108 of the operation rod 86 as a power point and the fulcrum bolt 122 inserted through the operation rod 86 at a position away from the gripping portion 108 as a fulcrum. The lever can be displaced in the front-rear direction of the vehicle using the principle of the lever with the action bolt 102 locked to the guide groove 100 of the block 98 as the action point. That is, as shown in FIGS. 2 to 3, the second stopper block 96 disposed at the tip of the stopper arm 84 is in contact with the first stopper block 88 fixed to the chassis frame 20. By pulling the grip 108 of the operating rod 86 from the state to the rear of the vehicle (right direction in FIGS. 2 and 3), the working bolt 102 is rotationally displaced with the fulcrum bolt 122 as the rotational center axis (fulcrum). 4-6, as the stopper arm 84 is displaced forward of the vehicle, the second stopper block 96 is separated from the first stopper block 88 and is held in the retracted position. It has become. Further, in the present embodiment, the setting of the contact position of the second stopper block 96 with the first stopper block 88 is performed as shown in FIGS. While the second stopper block 96 is brought into a non-contact state with the first stopper block 88 while being brought into contact with the upper wall portion 114 of the plate tool 110, the first stopper block 88 is located in front of the vehicle. As shown in FIGS. 4 to 6, the retracted position that is positioned and held is set so that the horizontal portion 90 of the stopper arm 84 contacts the upper wall portion 116 of the second support plate 112 and the stopper arm. This is realized by abutting the bracket 94 for supporting the extending portion 92 of the suspension 84 with the second stopper block 96.
[0041]
Further, a controller 124 having a substantially rectangular box shape is disposed at a substantially middle portion of the wheel base of the transport truck 18. The controller 124 is attached to the chassis frame 20 via an attachment member (not shown) and the like, and electronic control for instructing the first hydraulic cylinder 28 and the second hydraulic cylinder 70 to raise and lower the hydraulic level inside the controller 124. Equipment etc. are incorporated. In addition, a pair of push button switches arranged in the vertical direction of the vehicle project from the pair of side wall portions of the controller 124, and the pair of push buttons on one side wall portion (right side in FIG. 2). A switch drives the first hydraulic cylinder 28 to rotate the arm unit 14 around the shaft 26 in a counterclockwise direction, and a lowering switch 126 causes the arm unit 14 to rotate around the shaft 26 in a clockwise direction. The raising switch 126 is provided above one side wall of the controller 124, and the lowering switch 128 is located below the raising switch 126 and below the side wall. . Further, a pair of push button switches on the other side wall (left side in FIG. 2) of the controller 124 drives the second hydraulic cylinder 70 so that the platform 16 is rotated counterclockwise around the second pivots 62 and 62. And a closing switch 130 that is pivoted in the clockwise direction around the second pivot 62, 62. The closing switch 130 is located above the other side wall of the controller 124. In addition, the open switch 132 is located below the close switch 130 and below the side wall portion.
[0042]
Particularly in the present embodiment, a barrier 134 as a cover plate is provided at the tip of the grip portion 108 of the operation rod 86. The barrier 134 has a bent flat plate shape having a substantially L-shaped cross section, and the mounting rod 136 protruding from the outer peripheral surface is fixed to the tip of the gripping portion 108 by welding or the like, so that the gripping portion 108 is fixed. It is fixed. Further, as shown in FIGS. 4 to 6, the grip portion 108 of the operating rod 86 having such a barrier 134 is in a state where the second stopper block 96 is held at the retracted position, as shown in FIGS. In addition to being positioned nearby, a barrier 134 substantially shields the closed switch 130 projecting from the controller 124. In short, in the present embodiment, the controller 124 is closed as the retracting position of the second stopper block 96 and the contact position of the first stopper block 88 are manually operated by the grip portion 108 of the operating rod 86. The switch 130 is switched between a state where it is shielded by the barrier 134 and a state where it is not shielded. Therefore, when the second stopper block 96 is held in the retracted position, the closed switch 130 cannot be pressed. In addition, when the second stopper block 96 is in contact with the first stopper block 88, the closing switch 130 can be pressed.
[0043]
Further, an inclination preventing rod 137 is disposed between the opposing surfaces of the link arm 46 and the tension arm 48 between the opposing surfaces of the side wall 32 and the operating piece 50 of the base frame 30. The anti-tilt rod 137 has a rod shape, and is disposed between the side wall portion 32 of the base frame 30 and the operating piece 50 via a pivot 139 that is disposed at a substantially intermediate portion and extends parallel to the shaft 26. It is supported movably. One end of the anti-tilt rod 137 is disposed between the pivot 58 that supports one end of the tension arm 48 and the shaft 26 of the base frame 30, and the other end of the anti-tilt rod 137 is connected to the link arm 46 and the tension. The arm 48 is disposed between the opposing surfaces. Furthermore, as shown in FIG. 2 and the like, for example, the tilt prevention rod 137 narrows the space between the opposing surfaces of the link arm 46 and the tension arm 48 as the link mechanism 44 rotates around the shaft 26. In this case, one end of the anti-tilt rod 137 is brought into contact with the pivot 58 of the tension arm 48, and the other end of the anti-tilt rod 137 is brought into contact with the upper end surface of the link arm 46. The arm 46 and the tension arm 48 are bridged in the vertical direction so that the load bearing performance of the link mechanism 44 and, further, the twist of the link mechanism 44 are prevented.
[0044]
Incidentally, a double door rear door 138 is provided behind the container 24 in the transport truck 18. The rear door 138 is provided with a pair of lock rods 140 and 140 having a rod shape so as to protrude rearward of the vehicle. In addition, a pair of locking portions 144 and 144 having notches corresponding to the shape and the like of the front end portions of the lock rods 140 and 140 extending below the vehicle are fixed to the floor plate rear end edge portion 142 of the container 24. In the state where the rear door 138 is closed, the rear door 138 is locked so as not to be opened by locking the front ends of the lock rods 140 and 140 to the locking portions 144 and 144. Yes.
[0045]
Further, an angle steel 148 is disposed on the front end edge portion 146 of the platform 16 to which the pair of link substrates 52 and 52 are fixed. The angle steel 148 is fixed to the front edge 146 so as to extend over substantially the entire length of the front edge 146, and the upper surface of the angle steel 148 is substantially flush with the mounting surface 64 of the platform 16. Has been. A pair of notches 150 and 150 (see FIG. 6) are formed on the top surface of the angle steel 148. In particular, in the present embodiment, the notches 150 and 150 are made slightly larger than the locking portion 144 of the lock rod 140.
[0046]
Next, an operation mode of the tailgate lift 10 having the above-described structure will be described. Note that the stationary position of the platform 16 attached to the tailgate lift 10 is mainly (i) a closed position that rises substantially vertically along the rear surface of the container 24 (rear door 138) as shown in FIG. Open position: O, which is substantially horizontal with the loading platform 22 of the truck 18, etc .: (ii) As shown in FIG. 4, a lowering position: D, which is positioned at a loading / unloading place of a specific height or the ground, etc. iii) As shown in FIG. 5, the container 24 is divided into raised positions U that are substantially flush with the floor plate 152 of the container 24.
[0047]
First, as also shown in FIGS. 1 and 2, the platform 16 is generally held at a closed position C where the platform 16 rises substantially vertically along the rear surface of the container 24, and is substantially the same as the loading platform 22 of the transport truck 18. In order to lead to the horizontal open position: O, the open switch 132 of the controller 124 is pressed to drive the second hydraulic cylinder 70, and the rod 74 is gradually pulled into the cylinder portion 72. Is pivoted clockwise around the second pivot 62 on the link substrate 52, and the pressing operation of the open switch 132 is released when the platform 16 reaches the open position: C.
[0048]
Further, particularly in the present embodiment, the first stopper block 88 and the second stopper block 96 in the stopper unit 82 are maintained in contact with each other when the platform 16 is rotated around the second pivot 62. In addition, the tension arm 48 of the arm unit 14 (link mechanism 44) is maintained in contact with the second stopper block 96. That is, the contact surface 154 of the tension arm 48 of the link mechanism 44 is in contact with the first stopper block 88 via the second stopper block 96, so that the tension arm 48 is at the maximum rising end position: M. The position of the lifting end that does not reach (see FIG. 5): W is set. As a result, the rising end of the link arm 46 around the shaft 26 is set at the position shown in FIG. 2 (the lifting-up end). At this lifting-up end, the second end of the platform 16 is set. The pivoting operation leading from the closed position: C to the open position: O or the open position: O to the closed position: C with the pivot 2 as the pivot axis is from the lock rod 140 protruding from the double door rear door 138. Is also limited to a position separated by a predetermined amount rearward. As is apparent from the above description, in the present embodiment, the second hydraulic cylinder 70 constitutes an opening / closing drive source for rotating the platform 16 to the open position: O and the closed position: C. .
[0049]
In order to guide the platform 16 from the state in which the platform 16 is held at the open position O to the raised position U, which is substantially flush with the floor plate 152 of the container 24, as shown in FIG. The lower switch 128 of 124 is pressed to drive the first hydraulic cylinder 28, and the platform 16 is moved clockwise around the shaft 26 in the base unit 12 in accordance with the operation of gradually pulling the rod 38 into the cylinder portion 36. The platform 16 is held at an intermediate position (not shown) positioned downward from the open position: O by releasing the pressing operation of the lowering switch 128 by rotating by a predetermined amount. The platform 16 at the intermediate position is held in a state substantially parallel to the loading platform 22 or the floor plate 152 of the container 24 in the transport truck 18. (B) Next, as the grip 108 on the operation rod 86 of the stopper unit 82 is manually operated, the second stopper block 96 is separated from the first stopper block 88 and held in the retracted position. (C) Then, the platform 16 held at the intermediate position is moved to the shaft by the operation of pushing the raising switch 126 of the controller 124 to drive the first hydraulic cylinder 28 and causing the rod 38 to protrude from the cylinder portion 36. When the platform 16 reaches the ascending position U, the pushing operation of the ascending switch 126 is released.
[0050]
Further, particularly in the present embodiment, when the platform 16 is rotated around the shaft 26 of the platform 16 that guides the platform 16 from the intermediate position to the raised position U, the tension arm 48 of the arm unit 14 (link mechanism 44) The state of being in contact with the stopper block 88 is maintained. That is, the contact restriction of the contact surface 154 in the tension arm 48 as described above with respect to the first stopper block 88 by the second stopper block 96 is released, and the corresponding contact surface 154 contacts the first stopper block 88. As a result, the rising end of the tension arm 48 is set to the maximum rising end position: M, so that the platform 16 is set to the rising position: U that is substantially flush with the floor plate 152 of the container 24. The Rukoto. As a result, the rear door 138 of the container 24 is opened in a state where the platform 16 is held at the open position: O or an intermediate position, and a load provided with a caster or the like accommodated in the container 24 at the bottom is loaded. It is possible to guide to the mounting surface 64. Furthermore, in such a state, the front end edge 146 of the platform 16, and thus the angle steel 148, is not formed with a gap between the container 24 and the floor plate 152 (floor plate rear end portion 142). While being substantially flush with the floor plate 152, the engaging portions 144 of the pair of lock rods 140 at the rear edge 142 of the floor plate of the container 24 are positioned inside the notch 150 of the angle steel 148. Yes. In the present embodiment, as described above, the ascending end of the link arm 46 that is restricted by the ascending end of the tension arm 48 being restricted by the contact of the second stopper block 96 is the maximum ascending end. It is said.
[0051]
  In order to guide the platform 16 from the state where the platform 16 is held at the raised position U to a lowered position D where the platform 16 is loaded at a specific height or at the height of the ground or the like as shown in FIG. The lower switch 128 of 124 is pressed to drive the first hydraulic cylinder 28, and the platform 16 is moved about the second pivot 62 on the link board 52 as the rod 38 is gradually pulled into the cylinder portion 36. When the platform 16 reaches the lowering position: D, the pressing operation of the lowering switch 128 is released by rotating it clockwise. As a result, it is possible to load / unload a load or the like placed on the placement surface 64 of the platform 16 at the lift position: U onto a target loading / unloading place or the ground. Further, although not particularly described in detail in the description of the configuration of the tailgate lift 10 described above, the tailgate lift 10 includes, for example, a cargo bed as shown in Japanese Utility Model Publication No. 6-44749. 22 is provided with a tilting mechanism for rotating the platform 16 approximately parallel to the second axis 62 around the second pivot 62 in a clockwise direction at a predetermined angle.4Furthermore, as shown by the two-dot chain line at the lowered position D of the platform 16, the platform 16, which is substantially parallel to the loading platform 22, is rotated about the second pivot 62 clockwise by a predetermined angle, By bringing the rear edge 156 of the platform 16 into contact with the intended loading / unloading place or the ground, the loading / unloading operation of the load placed on the platform 16 is advantageously realized.
[0052]
Further, in order to place a load or the like on the platform 16 held at the lowered position: D and store it in the container 24, the first hydraulic cylinder 28 is driven by pressing the lift switch 126 of the controller 124, and the rod Along with the operation of projecting 38 from the cylinder portion 36, the platform 16 is rotated counterclockwise around the shaft 26 with the contact surface 154 of the tension arm 48 contacting the first stopper block 88. At least, when the platform 16 reaches the ascending position: U, the pressing operation of the ascending switch 126 is released, so that the platform 16 on which the load is placed at the descending position: D is held at the ascending position: U. Load the container 24 with the rear door 138 open, close the rear door 138 and lock it The head 140 engages with the locking portion 144 to lock the rear door 138 opening operation incapable.
[0053]
In particular, in the present embodiment, by holding the second stopper block 96 in the retracted position in advance, the grip 108 on the operation rod 86 of the stopper unit 82 is brought close to the controller 124, and the barrier 134 is a closed switch 130 of the controller 124. Therefore, since the pressing operation of the closing switch 130 is disabled, a sudden turning operation of the platform 16 at the raised position U is prevented. As is clear from this, in the present embodiment, a safety means for preventing the platform 16 from being raised to the closed position C by the second hydraulic cylinder 70 is provided on the grip 108 of the operating rod 86. It is constituted by a barrier 134 to be attached.
[0054]
In order to hold and store the platform 16 held at the raised position U at the closed position C where the platform 16 rises substantially vertically along the rear surface of the container 24 (rear door 138). The first hydraulic cylinder 28 is driven by pressing the lowering switch 128, and the platform 16 is rotated clockwise by a predetermined amount around the shaft 26 in accordance with the operation of gradually pulling the rod 38 into the cylinder portion 36. The platform 16 is held from the raised position: O to the above-mentioned intermediate position by moving and releasing the pressing operation of the lowering switch 128. (B) Further, the second stopper block 96 previously held in the retracted position is manually held by the grip portion 108 of the operation rod 86 of the stopper unit 82 and held in contact with the first stopper block 88. At the same time, the lift switch 126 of the controller 124 is pressed to drive the first hydraulic cylinder 28, and the platform 16 is rotated counterclockwise around the shaft 26 as the rod 38 protrudes from the cylinder portion 36. The push-up operation of the ascending switch 126 is released in the state where the lifting end (upper end) of the tension arm 48 is brought into contact with the second stopper block 96 and is set at the lifting-up end position: W. By doing so, the platform 16 is held in the open position: U from the intermediate position. (C) Then, as the second stopper block 96 comes into contact with the first stopper block 88, the second hydraulic cylinder is operated by pressing the closing switch 130 of the controller 124 that has been released from being blocked by the barrier 134. 70 is driven to cause the rod 74 to protrude from the cylinder portion 72, and the platform 16 in the open position: O is rotated counterclockwise around the second pivot 62, so that the platform 16 is in the closed position: When reaching C, the pressing operation of the closing switch 130 is released. Thereby, the platform 16 can be stored and held so as to rise substantially vertically along the rear surface of the container 24 (rear door 138). Note that the tailgate lift 10 is provided with a locking member for connecting the rear door 138 or the container 24 and the platform 16 in a bridging manner when the platform is raised, thereby raising the platform. The state is advantageously maintained.
[0055]
Note that the platform 16 held in the raised position: U is stored in the closed position: C where the platform 16 rises substantially vertically along the rear surface of the container 24 (rear door 138). For example, the platform 16 is rotated by the first hydraulic cylinder 38 from the raised position U to the intermediate position, and the container 24 (rear door 138) is moved by the second hydraulic cylinder 70 at the intermediate position. The second stopper block 96 raised and held substantially in parallel with the rear surface is brought into contact with the first stopper block 88 by manual operation of the grip portion 108 to raise the controller 124. The switch 126 is pressed and the platform 16 is rotated counterclockwise around the shaft 26 by the first hydraulic cylinder 28. The platform 16 is guided from the intermediate position to the closed position: C by bringing the rising end (upper end) of the tension arm 48 into contact with the second stopper block 96. It is also possible to store and hold the container 24 (rear door 138) so as to rise substantially vertically along the rear surface.
[0056]
In the tailgate lift 10 having the above-described structure, the opening / closing operation for guiding the platform 16 from the open position to the closed position or from the closed position to the open position by the second hydraulic cylinder 70 is performed by the contact surface 154 of the tension arm 48. Comes into contact with the first stopper block 88 and the position of the maximum ascending end is set to W, and the second stopper block 96 is brought into contact with the first stopper block 88 from the position where the platform 16 is substantially level with the loading platform 22. The contact surface 154 of the tension arm 48 is brought into contact with the second stopper block 96 and the contact surface 154 is lowered below the vehicle by the height dimension of the first and second stopper blocks 88 and 96. Ascending end position: When performed at W, the platform 16 is separated from the rear surface of the container 24 backward by a predetermined amount. It is adapted to be opened and closed in position.
[0057]
Therefore, since the platform 16 is opened / closed behind the protruding amount of the lock rod 140 attached to the double door rear door 138, the startup operation of the platform 16 avoiding the lock rod 140 is advantageously realized. In addition, when the double door rear door 138 is opened, the front end edge 146 of the platform 16 held in a horizontal state is sufficiently close to the rear end edge 142 of the floor 24 of the container 24 so that the space between the two Since the gap can be reduced, the loadability of loading and unloading can be advantageously improved.
[0058]
In the present embodiment, the second stopper block 96 is arranged between the contact surface 154 of the tension arm 48 and the chassis frame 20 in the link mechanism 44 so that the second stopper block 96 can be inserted / removed manually by the grip portion 108. As a result, the contact surface 154 of the tension arm 48 can be selected and set with a simple structure and reliably at the maximum ascending end position: M and the lifting ascending end position: W.
[0059]
Further, in the present embodiment, the second stopper block 96 is held in the retracted position, the contact surface 154 of the tension arm 48 is positioned at the maximum ascending end, and the platform 16 is in the state of being close to the container 24 floor plate 152. , The closing switch 130 of the controller 124 is shielded by the barrier 134, thereby preventing the platform 16 from being raised to the closed position: C, so that the lock rod protrudes outward from the rear of the container 24. 140, the locking portion 144, and the front edge 146 (angle iron 148) of the platform 16 are prevented from contacting with the rotational displacement of the platform 16, so that the platform 16 can be rotated by an erroneous operation or the like. The danger associated with movement can be effectively eliminated.
[0060]
In the present embodiment, the angle steel 148 that is fixed to the front end edge 146 of the platform 16 is provided with the notch 150, so that the angle steel 148, and thus the front end edge 146 of the platform 16 is connected to the container 24. Since the contact between the locking portion 144 of the lock rod 140 and the angle steel 148 is avoided by the notch 150 when approaching the rear edge 142 of the floor plate of the floor plate, the platform 16 and the container 24 floor plate 152 are prevented. Both can be brought close to each other so that the gap between them is almost completely filled.
[0061]
As mentioned above, although embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not interpreted limitedly by the specific description in this embodiment.
[0062]
For example, in the above-described embodiment, the link mechanism 44 includes a plurality of link members including the link arm 46 and the tension arm 48, the operating piece 50 and the link substrate 52, and the side wall portion 32 of the base frame 30. However, the present invention is not limited to this. For example, the link mechanism of the present embodiment may be configured with a three-bar link mechanism as disclosed in JP-A-11-59255. Is possible.
[0063]
In the above embodiment, the first stopper block 88 defines the position M of the maximum rising end of the tension arm 48. However, when the maximum rising end of the link arm 46 is defined by another mechanism. The first stopper block 88 is not necessarily provided. In that case, for example, only the second stopper block 96 is detachably disposed on the opposing surface of the link mechanism 44 (tension arm 48) in the chassis frame 20, and the link mechanism 44 is connected to the second stopper block 96. The position of the lifted end of the link mechanism 44 (link arm 46) can be defined by contacting the chassis frame 20 via.
[0064]
Further, the angle steel 148 fixed to the front edge 146 of the platform 16 is not necessarily provided. Further, when the platform 16 without such angle iron 148 is adopted and the platform 16 is supported substantially horizontally at the same height as the floor plate 152 of the container 24, the front edge 146 of the platform 16 is supported. The front edge 146 and thus the shape and size of the platform 16 can be appropriately set and changed so that the container 24 is sufficiently close to the rear edge 142 of the floor plate of the container 24. A cutout portion may be formed in the end edge portion 146 so as to avoid a protruding amount of the lock rod 140 from the container 24 floor plate 152.
[0065]
Further, the driving mechanism of the second stopper block 96 is not limited to the operation rod 86 using the principle of lever by manual operation, as shown in the figure. For example, the second stopper block 96 is driven using a motor or the like. It is also possible to drive 96 automatically.
[0066]
Further, the second stopper block 96 may be driven using a wire or the like instead of the operation rod 86. Specifically, for example, the driving mechanism of the second stopper block 96 includes a tube insertion type wire, an urging means for urging the second stopper block 96 in one direction, and the urging means. In contrast, it is configured to include an urging means or a locking means for holding the wire in the pulling position by pulling the wire against the pulling position, and driving the wire to a position where the urging force is applied and the pulling position. By applying a reciprocating driving force to the stopper block 96, the second stopper block 96 can be driven to a contact position with respect to the first stopper block 88 and a retracted position. In particular, by using such a wire or the like, the driving mechanism of the second stopper block 96 can be curved and arranged in a narrow portion of the chassis frame 20 or the like as compared with a rod or the like. In addition, the application range of the stopper unit 82 including the second stopper block 96 and the tailgate lift 10 to various automobiles can be further expanded.
[0067]
In addition, although not enumerated one by one, the present invention can be implemented in a mode with various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art, and such embodiments are not limited to the present invention. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.
[0068]
【The invention's effect】
As is clear from the above description, in the tailgate lift in the lorry constructed according to the present invention, the tail end of the main arm is set at the two-stage position by the lifting stopper member. For example, in a lorry with protrusions behind the container, such as a lock rod attached to a double door rear door, the gate can be raised at a position avoiding the protrusions behind the container, and the tailgate and container floor plate When the container door is opened in a substantially horizontal position, the tailgate can be sufficiently close to the container floor board.
[Brief description of the drawings]
FIG. 1 is a perspective model view showing a tailgate lift attached to a transport truck according to an embodiment of the present invention.
FIG. 2 is an explanatory side view showing an operation mode of the tailgate lift shown in FIG. 1;
FIG. 3 is an explanatory bottom view showing one mode of operation of the tailgate lift corresponding to FIG. 2;
FIG. 4 is an explanatory side view showing one mode of operation of the tailgate lift shown in FIG. 1;
FIG. 5 is an explanatory side view showing an operation mode of the tailgate lift shown in FIG. 1;
6 is an explanatory bottom view showing one mode of operation of the tailgate lift corresponding to FIG. 4 or FIG.
[Explanation of symbols]
10 Tailgate lift
16 platforms
18 Transport truck
20 Chassis frame
24 containers
26 Shaft
28 First hydraulic cylinder
46 Link arm
70 Second hydraulic cylinder
96 Second stopper block
152 floor board

Claims (6)

A pair of left and right main arms that are arranged to extend rearward from the rotation center axis extending in the vehicle width direction at the rear part of the chassis frame of the lorry and are supported to be rotatable about the rotation center axis. A plate-like tailgate is attached to the tip, and the pair of main arms are pivoted by a lifting drive source to raise and lower the tailgate, and the tailgate is mounted on the chassis frame at the raised position. The tailgate is supported horizontally at the same height as the top surface of the floorboard at the rear of the mounted floorboard, and the tailgate is grounded at the lowered position, while the tailgate is driven to open and close at the raised position. The source is pivotally operated with respect to the pair of main arms, and is led from a substantially horizontal open position to a closed position that rises substantially vertically along the rear surface of the container or the like. In tailgate lift in lorry that can accommodate By allowed to lifting,
By restricting the pivot end on the ascending side of the main arm, a lifting end that does not reach the maximum ascending end supported substantially horizontally at the same height as the upper surface of the floor plate behind the floor plate of the container or the like is set. A lifting stopper member that is releasable, the rising position of the main arm can be selected and set at the maximum rising end and the lifting lift end, and the tail gate is guided to the closed position at the lifting lift end. Is kept upright and spaced apart from the rear surface of the container or the like by a predetermined amount ,
A link mechanism comprising a plurality of link members for connecting the tailgate to the chassis frame so as to be movable up and down on both sides in the vehicle width direction of the tailgate is constituted by a plurality of link members including the main arm. In addition, the holding stopper member is disposed so as to be detachable between the opposed surfaces of the link frame and the chassis frame at the position of the rotating end of any one of the link members.
Further, when any one of the link members constituting the link mechanism is brought into contact, a main stopper that defines the maximum rising end of the main arm is fixed to the chassis frame, and the main stopper A tailgate lift in a lorry characterized in that the retaining stopper member is detachably disposed on a contact surface of a link member . A pair of left and right tension arms, which are positioned above the rotation center axis and supported so as to be rotatable around a second rotation center axis disposed in parallel with the rotation center axis, By arranging the tension arms and the respective leading ends of the main arms with connecting headers, a four-bar linkage mechanism is formed on each of the left and right sides. The tailgate is attached across the two, the left and right connecting headers are connected to each other by the tailgate, and supported by the left and right connecting headers to support the rotation center shaft and the second The tailgate is rotatably supported around a third rotation center axis extending in the vehicle width direction in parallel with the rotation center axis, and is further abutted against the tension arm. Tailgate lift according to claim 1, the Tsu path member is disposed. The opening / closing drive source of the tailgate is removed in a state where the main arm is positioned at the maximum rising end without being defined by the holding stopper member by pulling the holding stopper member and holding it in the retracted position. The tailgate lift according to claim 1 or 2 , further comprising a safety means for preventing the start-up operation to the closed position due to. The tail stopper member is manually inserted and removed, and the tailgate is set in the closed position while the stopper is removed and held in the retracted position in conjunction with the insertion and removal operation of the stopper stopper member. The tailgate lift according to claim 3 , wherein a cover plate that covers a switch of the open / close drive source for raising is used as the safety means. The container or the like has a double door rear door, and a lock rod for locking the rear door so that the rear door cannot be opened is provided to protrude outward from the rear door of the container or the like, and the main arm The front edge of the tailgate supported horizontally at the maximum rising end of the main guide is led to a position close to the rear edge of the floor plate of the container or the like where the rear door is opened. 2. The tailgate that is raised at a lifted end is spaced apart from the rear surface of the container or the like with the rear door closed by at least the amount of protrusion of the lock rod. or tailgate lift according to any one of 4. A notch is provided at the front edge of the tailgate, and the tailgate protrudes rearward from the floor plate of the container or the like by the notch at the front edge of the tailgate supported horizontally at the maximum rising end of the main arm. The tailgate lift according to claim 5 , wherein the locking portion of the lock rod provided escapes.

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