JP3110527U - Folding assist mechanism for folding load carrier in retractable load carrier lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding assist mechanism for a folding load receiver in a retractable load receiver lifting device capable of arranging a torsion bar that exhibits an auxiliary function with a feeling integrated with a load receiver and having a very excellent design. To do.
A loading platform 5 is provided on the loading platform 1 so as to be movable up and down, and the loading platform 5 is divided into at least two front end members 51 and a proximal end member 52 so as to be foldable. In the retractable load receiving and lifting device 2 that is slidable between the storage position and the work position C that protrudes outward from the loading platform 1 and performs the lifting operation, the proximal end side member 52 or the distal end of the load receiving platform 5 One end portion of the torsion bar 71 is slidably provided on one side portion of the side member 51, and the middle portion of the torsion bar 71 is guided to the adjacent distal end member 51 side or proximal end member 52 side to the other side. It is folded back toward the portion and is fastened in a state in which rotation around the axis is prevented on the other side portion side of the distal end side member 51 or the proximal end side member 52.
[Selection] Figure 1

Description

  The present invention relates to a foldable load receiving platform in a load receiving platform lifting apparatus, and more particularly to a folding assist mechanism that assists this operation when folding each divided member constituting the load receiving platform.

  Conventionally, a loading platform is provided on the loading platform so that it can be moved up and down, and the loading platform is divided into, for example, two divided members, both of which are configured to be foldable via a hinge portion. There is provided a retractable load receiving table elevating device that is slidable between a work position that protrudes in the direction and performs an elevating operation.

And, in the folding type load receiving table that folds in this way, a coiled spring is provided by using the hinge portion, and the coil receiving spring that generates a torsional force when the load receiving table is expanded or folded is assisted. Therefore, the force required at the time of unfolding or folding is reduced (see, for example, Patent Document 1).
JP 2001-39207 A

  However, in the case where a coiled spring is provided as a folding assist mechanism for assisting the operation during expansion or folding as in the conventional case, the coiled spring becomes large in order to perform its function. For this reason, when the load receiving base is folded, the large coiled spring is exposed to the outside, which makes it look bad.

  In order to achieve the above object, the folding assist mechanism of the folding load receiver in the retractable load receiver lifting device according to the first aspect of the present invention is provided with a load receiver that can be raised and lowered on the load carrier, and at least two load receivers. It is divided into a front end side member and a base end side member, and is configured to be foldable, and is slidable between a storage position below the loading platform and a working position that protrudes outward from the loading platform and performs a lifting operation. In the retractable cargo receiver lifting device, one end of the torsion bar is slidably provided on one side of the base end member or the front end member of the load receiver, and the middle of the torsion bar is adjacent to the front end side Guided to the member side or base end side member, folded back toward the other side, and fixed in a state where rotation around the shaft core is prevented on the other side of the tip end side member or base end side member Been Is shall.

  According to the present invention, the function of assisting the operation of lifting the load receiving table by the torsion bar when the load receiving table is unfolded or folded can be exhibited, and the torsion bar is arranged in a manner integrated with the load receiving table. It is possible to provide a load receiving table lifting apparatus that is very excellent in design.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic configuration of a retractable cargo receiving table lifting device.

  In FIG. 1, reference numeral 1 denotes a loading platform mounted on a vehicle frame 11, and a retractable loading platform elevating device 2 is provided below the rear end of the loading platform 1.

  The retractable load receiving table lifting / lowering device 2 includes an attachment member 3 provided on the vehicle frame 11 and a load receiving stand 5 provided on the attachment member 3 via a link mechanism 4.

  The attachment member 3 is slidable in the front-rear direction along a slide rail 12 disposed in the front-rear direction at the rear end portion of the vehicle frame 11.

  Specifically, the slide rail 12 is made of, for example, an I-shaped steel, and is arranged with the web in the middle of the slide rail 12 being vertical, and the slide member 3 is slidably provided on the slide rail 12 via a slide mechanism (not shown). . The slide mechanism includes, for example, a slide pad that is in sliding contact with the upper and lower flanges of the slide rail 12 sandwiched from above and below, a roller that rolls the outer surface of the web of the slide rail 12 in the slide direction, and the like.

  A drive shaft 6 is supported on the mounting member 3 substantially horizontally. A base end portion of a drive arm 61 is integrally fixed to the drive shaft 6, and a distal end of a telescopic rod 62 a of a lift cylinder 62 provided on the mounting member 3 is connected to the distal end portion of the drive arm 61.

  Further, the drive shaft 6 is integrally provided with a base end portion of a rotation bracket 63, and a base end portion of a lift link 41 described later is pivotally supported at an intermediate portion of the rotation bracket 63.

  The link mechanism 4 includes a lift link 41 and a connecting link 42.

  The lift link 41 is pivotally supported by a pivot 41 a at the base end of the pivot bracket 63.

  A contact bolt 64 provided at the distal end of the rotating bracket 63 is configured to be able to contact the lower surface of the lift link 41 near the base end portion. By abutting on the part closer to the end from below, the expansion / contraction operation of the lift cylinder 62 can be transmitted to the lift link 41 as the rotation operation of the rotation bracket 63 via the drive arm 61 and the drive shaft 6. As a result, the lift link 41 rotates up and down.

  The base end of the connecting link 42 is pivotally supported on the mounting member 3 by a pivot 42a.

  A pair of left and right members such as the slide rail 12, the mounting member 3, the link mechanism 4, and the drive shaft 6 described above are provided on both sides of the vehicle frame 11, and the left and right mounting members 3 slide in synchronization with the slide rail 12. Are connected to each other by a connecting member 3a.

  The load receiving platform 5 includes a distal end side member 51 and a proximal end side member 52, and the distal end side member 51 and the proximal end side member 52 are connected to each other by a hinge 53. It can be folded in two on the top surface.

  On the left and right sides of the base end portion of the base end side member 52, the tip ends of the left and right connecting links 42 are pivotally supported by pivots 42 b on the upper portions thereof via brackets 54, and the tips of the left and right lift links 41 are supported on the lower portions thereof. The part is pivotally supported by the pivot 41b.

  Further, the tip of the tip side member 51 is formed in a wedge shape, and when the load receiving platform 5 reaches the ground, it tilts as shown by the one-dot chain line in FIG. Has been made.

  Next, the operation of the retractable load receiving device lifting apparatus configured as described above will be described.

  As a basic operation of the retractable load receiving device lifting / lowering device 2, the retractable load receiving device lifting / lowering device 2 moves the mounting member 3 to the front end of the slide rail 12 in a state where the load receiving stand 5 is folded by the operation of the moving means described above. The storage position A (refer to FIG. 2) for sliding and storing the front end side member 51 and the base end side member 52 of the load receiving base 5 which is folded by sliding the mounting member 3 to the rear end portion of the slide rail 12 are stored. The unfolding / folding position B (see FIG. 3) for unfolding the unfolded load receiving stand 5 and the mounting member 3 in the middle of the slide rail 12 with the load receiving stand 5 unfolded. The load receiving platform 5 can be placed at a lifting operation position C (see FIG. 1) in which the load receiving platform 5 is moved up and down between the ground and the floor surface of the loading platform 1.

  First, when the loading / unloading operation of the load is performed by the retractable load receiving device lifting / lowering device 2 disposed at the storage position A as shown in FIG. 2, the attachment member 3 is moved from the front end of the slide rail 12 to the rear in this state. By sliding to the end, the retractable load receiving device lifting device 2 is placed at the unfolding / folding position B shown in FIG.

  When the retractable load receiving table elevating device 2 is arranged at the unfolding / folding position B in this way, the distal end side member 51 of the folded load receiving stand 5 is rotated rearward to thereby move the proximal end side member 52 and the distal end side member. Deploy 51 so that it is horizontal. Since the loading platform 5 is deployed with the entire loading platform 5 pulled out behind the loading platform 1 and the vehicle frame 11, the loading platform 5 does not interfere with the loading platform 1 and the vehicle frame 11.

  In this state, when the retractable load receiving device elevating device 2 is slid from the unfolded / folded position B to the elevating work position C side and the mounting member 3 reaches the elevating work position C, the retractable load receiving device is moved up and down by positioning means (not shown). The apparatus 2 is positioned at the raising / lowering operation position C.

  As a result, the load receiving platform 5 can move up and down between the ground and the floor surface of the loading platform 1 by the expansion and contraction operation of the lift cylinder 62, and this lifting operation allows the load receiving platform 5 to move between the ground and the loading platform 1. Perform unloading work.

  Next, when the loading / unloading operation of the load is completed and the retractable load receiving device lifting / lowering device 2 is stored, the retractable load receiving device lifting / lowering device 2 is temporarily arranged from the lifting / lowering operation position C to the unfolding / folding position B, At this position, the front end side member 51 of the load receiving platform 5 is folded. The loading platform 5 is folded in a state where the entire loading platform 5 is pulled out behind the loading platform 1 and the vehicle frame 11 in the same manner as the above-described deployment of the loading platform 5, so that the loading platform 5 is loaded with the loading platform 1 and the vehicle frame 11. There will be no interference.

  Then, with the load receiving platform 5 folded in this manner, the retractable load receiving platform lifting device 2 is slid from the unfolded / folded position B to the storage position A side and disposed at the retracted position.

  By the way, the folding type load receiving platform 5 is provided with a folding assist mechanism 7 in the retractable load receiving platform lifting / lowering device 2 configured as described above.

  The folding assist mechanism 7 includes a torsion bar 71 as shown in FIGS. Specifically, as shown in FIG. 6, the torsion bar 71 has one end portion 72 slidably provided on one side portion of the base end side member 52 via the sliding mechanism 8 and a midway portion 73. It is led to the distal end side member 51 near the end side member 52 and folded back to the other side portion near the proximal end member 52 of the distal end side member 51, and the other end portion 74 is the other side portion of the distal end side member 51. It is fixed in a state in which the rotation around the shaft core is prevented on the side.

  The sliding mechanism 8 includes a columnar support member 81 that is provided on one side of the base end side member 52 and has an insertion hole 82 through which the one end 72 of the torsion bar 71 is inserted. It is slidably supported in the core direction. Further, the support member 81 can be rotated around the central axis with respect to one side portion of the base end side member 52 so as to correspond to an angle change of the one end portion 72 accompanying rotation of the distal end side member 51 described later. Is provided.

  As shown in FIG. 4, the folding assist mechanism 7 configured as described above is in a so-called neutral state in which the torsion bar 71 is not twisted when the distal end side member 51 stands in the vertical direction.

  Then, from this state, for example, as shown in FIG. 5, the distal end side member 51 is rotated (deployed) downward so as to be substantially flush with the proximal end side member 52, thereby extending in the width direction of the load receiving platform 5. A twist corresponding to the rotation of the torsion bar 71 from the midway portion 73 to the other end portion 74 occurs. Therefore, when the front end side member 51 is rotated from the state shown in FIG. 5 to the state shown in FIG. 4, the repulsive force due to the torsion acts in this rotation direction, thereby assisting the rotation operation by the operator. Can do.

  On the other hand, the torsion bar extending in the width direction of the load receiving platform 5 can also be obtained by rotating (folding) the distal end side member 51 downward on the proximal end side member 52 as shown in FIG. 3 from the state shown in FIG. The twist corresponding to the rotation occurs from the middle part 73 of 71 to the other end part 74. Therefore, when the tip side member 51 is rotated from the state shown in FIG. 3 to the state shown in FIG. 4, the repulsive force due to the torsion acts in this rotational direction in the same manner as described above. Can assist. In this case, the one end portion 72 of the torsion bar 71 is slid by the sliding mechanism 8 in accordance with the posture change of the distal end side member 51, thereby exhibiting the auxiliary function described above while following the posture change.

  That is, the torsion bar 71 has a function of assisting this operation during the operation of lifting and erecting the distal end side member 51 in the vertical direction as shown in FIG. 4 when the distal end side member 51 is expanded or folded.

  Moreover, a torsion bar 71 that exhibits an auxiliary function with a feeling integrated with the load receiving platform 5 can be disposed, and a load receiving table lifting device that is very excellent in design can be provided.

  FIG. 7 shows another configuration of the folding assist mechanism.

  This folding assist mechanism 7 has a different structure from the sliding mechanism 8 that slidably supports one end 72 of the torsion bar 71.

  Specifically, the sliding mechanism 8 is configured by forming a groove portion 52a in the front-rear direction on the side surface of the base end side member 52, and slidably inserting the tip end of the one end portion 72 into the groove portion 52a. ing. The other arrangements of the torsion bar 71 are the same as those described above.

  The folding assist mechanism 7 having such a sliding mechanism 8 also exhibits the same auxiliary mechanism as the folding assist mechanism 7 described above while following the change in the posture of the distal end side member 51 by the sliding mechanism 8. And similar effects can be achieved.

  FIG. 8 shows still another configuration of the folding assist mechanism.

  The folding assist mechanism 7 has a different configuration of the sliding mechanism 8 that slidably supports the one end portion 72 of the torsion bar 71, and the arrangement position of the middle portion of the torsion bar 71 is different.

  Specifically, the sliding mechanism 8 is configured by a long flat plate member in which one end portion 72 of the torsion bar 71 has a long hole 72a, and the base end side member 52 is inserted into the long hole 72a of the flat plate member. A pin 52b provided on the side surface is slidably fitted.

  Further, from the middle portion of the torsion bar 71 to the other end portion held by the distal end side member 51, it is formed in a bar shape as described above and is integrally connected to the flat plate member. In a state where the distal end side member 51 is folded on the proximal end side member 52, the distal end side member 51 and the proximal end side member 52 are disposed so as to be supported via a hinge 53 on the rear end side. Yes. Specifically, in a state where the distal end side member 51 is folded on the proximal end side member 52, a portion that becomes the rear end side of the hinge 53 is bulged, and the bulged portion 53a forms the rod-shaped portion 71a of the torsion bar 71. I support it.

  By configuring the folding assist mechanism 7 in this way, the same assist mechanism as the above-described folding assist mechanism 7 can be exhibited while following the change in the posture of the distal end side member 51 by the sliding mechanism 8. Can be played.

  Note that the above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope thereof.

  For example, in this embodiment, the link mechanism 4 has been described as an elevating mechanism for elevating and lowering the load receiving platform 5. However, the elevating mechanism is not limited to this, and the present invention is applicable to the folding type load receiving platform 5 in general. Can do.

  Moreover, the folding support mechanism of this invention can be applied to the load receiving stand 5 not only in a 2-fold but also in a 3-fold or more.

  Further, the torsion bar 71 may be disposed on the base end side member 52 and the front end side member 51 in the reverse manner as described above. That is, one end portion of the torsion bar is slidably provided at one side portion of the distal end side member 51, and the middle portion of the torsion bar is guided to the adjacent proximal end side member 52 and folded toward the other side portion. You may make it fix in the state which blocked | prevented rotation centering on an axial center by the other side part side of the base end side member 52. FIG.

It is a side view which shows the state by which the retractable cargo receiving platform raising / lowering device was arrange | positioned in the operation position. It is a side view which shows the state which has arrange | positioned the same apparatus in the storage position. It is a side view which shows the state which has arrange | positioned the apparatus in the expansion | deployment / folding position. It is a side view which shows the state which has arrange | positioned the apparatus in the expansion | deployment and folding position, and expand | deployed the front end side member perpendicularly | vertically. It is a side view which shows the state which has arrange | positioned the apparatus in the expansion | deployment and folding position, and expand | deployed the front end side member horizontally. It is a general | schematic perspective view which shows the structure of a folding assistance mechanism typically. It is a schematic side view which shows typically the other structure of a folding assistance mechanism. It is a schematic side view which shows typically the other structure of a folding assistance mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loading platform 2 Retractable loading platform raising / lowering device 5 Loading platform 51 Front end side member 52 Base end side member 7 Folding auxiliary mechanism 71 Torsion bar 72 One end portion 73 Middle portion 74 Other end portion 8 Sliding mechanism

Claims (1)

The loading platform is provided on the loading platform so as to be movable up and down, and the loading platform is divided into at least two distal end members and a proximal end member so as to be foldable, and protrudes outward from the storage position below the loading platform and the loading platform. In the retractable loading platform lifting device that is slidable between the work position that is arranged and performs the lifting operation,
One end portion of the torsion bar is slidably provided at one side portion of the proximal end member or the distal end side member of the load receiving platform, and the intermediate portion of the torsion bar is adjacent to the adjacent distal end member side or proximal end member. It is guided and folded back toward the other side, and is fixed in a state where rotation around the axis is prevented on the other side of the distal end side member or the base end side member. Folding assist mechanism for the folding load carrier in the retractable load carrier lifting device.

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