JP2019137224A - Loading platform lift - Google Patents

Abstract

To enhance the coupling rigidity of a connecting member and a stiffener with a simple structure, and to enhance the stiffness and rigidity of a loading platform as a whole, in a loading platform lift for lifting the loading platform which comprises a loading platform main body, the stiffener which firmly adheres to a back face of the loading platform main body, and the connecting member which is arranged adjacent to a base end of the stiffener, and fixed to a base end part of the loading platform main body.SOLUTION: A connecting member J arranged at a base end Se of a stiffener S adjacent thereto, and fixed to a base end part Tme of a loading platform main body Tm comprises: a lateral plate 30 extending to a direction orthogonal to the stiffener S, having one surface f connected to a base end Se of the stiffener S; and at least two pieces of vertical plates 31 to 33 which are fixed to the lateral plate 30, protrude from the other face f' of the lateral plate 30, and are aligned in parallel with each other with an interval. The specified vertical plate 32 constitutes a support part with respect to a pivot P3 in cooperation with the other vertical plates 31, 33, and extends into the stiffener S through a penetration hole 30h which is formed at the lateral plate 30. An extension part 32a of the specified vertical plate is coupled to the stiffener S.SELECTED DRAWING: Figure 8

Description

  The present invention includes a load receiving table on which a load can be placed, and a load receiving device that is driven to move up and down so that the load receiving table can be used for loading and unloading a load between a load table surface higher than the ground and the ground. The present invention relates to a table lifting device.

  Such a load receiving table lifting device is already known as disclosed in Patent Document 1 below.

Japanese Utility Model Publication No. 1-69045

  In the load receiving platform lifting apparatus of Patent Document 1, the load receiving platform includes a gate frame 50 (load receiving body main body) that has a surface on which a load is placed and is formed in a flat box plate shape having a tapered cross section, and a gate frame. Link substrate 52 (connection member) fixed to 50. The link substrate 52 includes a horizontal plate coupled to the base end of the gate frame 50 and a plurality of support plate portions 61 to 63 (vertical) which are respectively provided on the outer surface of the horizontal plate and are arranged in parallel with a space therebetween. The support plate portions 61 to 63 are pivotally connected to the link plate 53 and the lift arm 37 which are output end portions of the elevating drive device.

  However, in the above structure, the support plate portions 61 to 63 (vertical plates) are simply coupled to the horizontal plate, and the gate frame 50 (load receiving body) extending on the opposite side across the horizontal plate, and the support plate portion 61-63 (vertical plate) is divided by a horizontal plate. Therefore, even if a stiffener or other reinforcing member is attached to the gate frame 50, the reinforcing member and the support plate portions 61 to 63 (vertical plates) are divided by the horizontal plate, and the structure is mutually reinforcing. This is disadvantageous in increasing the rigidity of the entire load receiving platform.

  The present invention has been proposed in view of the above, and an object of the present invention is to provide a load receiving table lifting apparatus that can solve the problems of the conventional apparatus with a simple structure.

  In order to achieve the above object, the present invention drives a load receiving platform on which a load can be placed, and the load receiving platform so that the load receiving table can be used for loading and unloading a load between a load carrying surface higher than the ground and the ground. In the load receiving platform lifting apparatus including the lifting drive device, the load receiving platform includes a load receiving base body having a load placement surface on a surface thereof, a stiffener fixed to a back surface of the load receiving base body, and a base end of the stiffener. A connecting member that is disposed adjacently and is fixed to a base end portion of the load receiving body, and is rotatably connected to an output end portion of the elevating drive device via a pivot. A horizontal plate extending in a direction orthogonal to the stiffener and having one surface connected to the proximal end of the stiffener, and fixed to the horizontal plate, protruding from the other surface of the horizontal plate, and spaced apart from each other in the direction. With at least two vertical plates arranged in parallel, specific The vertical plate forms a support portion for the pivot in cooperation with other vertical plates, and extends into the stiffener through a through-hole provided in the horizontal plate, and the extended portion is provided in the stiffener. The first feature is to be combined.

  Further, according to the present invention, in addition to the first feature, a hoisting cylinder for raising and lowering the load receiving table with respect to the output end is interposed between the output end of the elevating drive device and the stiffener. The second feature is that a middle portion of the undulating cylinder passes through the through hole with a gap.

  According to the present invention, the load receiving table includes a load receiving body having a surface on which a load is placed, a stiffener fixed to the back surface of the load receiving body, and a proximal end of the load receiving body disposed adjacent to the proximal end of the stiffener. A connecting member fixed to the portion, and is pivotally connected to the output end of the lifting / lowering drive device via a pivot. The connecting member extends in a direction perpendicular to the stiffener and extends to the base end of the stiffener A horizontal plate having one surface connected thereto, and at least two vertical plates fixed to the horizontal plate and projecting from the other surface of the horizontal plate and arranged parallel to each other at intervals in the direction. The support member for the pivot is configured in cooperation with the other vertical plate, and extends into the stiffener through a through hole provided in the horizontal plate, and the extended portion is coupled to the stiffener. The specific vertical plate in is long in the stiffener without being divided by the horizontal plate. Issued to can be coupled integrated with the stiffener is. Thereby, since the coupling strength between the connecting member including the vertical plate and the stiffener is sufficiently increased, it is possible to effectively increase the rigidity strength of the entire load receiving platform.

  According to the second feature, a hoisting cylinder is provided between the output end of the elevating drive device and the stiffener to loosely pass through the through hole and turn the load receiving table up and down with respect to the output end. Therefore, the through-hole provided in the horizontal plate is a through-hole for passing the specific vertical plate to the stiffener side, and the portion outside the stiffener of the hoisting cylinder in which the main part is arranged in the stiffener is the output of the lifting drive It can also be used as a through-hole for passing through the end side, and it can contribute to simplification of the structure of the device and thus cost reduction.

The whole side view which shows one Embodiment of the cargo handling vehicle provided with the load receiving stand raising / lowering apparatus of this invention Side view of the main part of the loading platform lifting device (enlarged side view of the part shown by arrow 2 in FIG. 1) Exploded side view of the main part of the loading platform lifting device Sectional view taken along line 4-4 of FIG. 2 (however, the solid lines of the cargo cradle and the body frame are not shown) Sectional view along line 5-5 in FIG. Partially broken and enlarged side view showing the main part of the rear part of the vehicle body showing a storage state in which the receiving platform is held at the storage position T1. Rear view showing the stowed state of the cargo cradle (7 arrow view of FIG. 6) FIG. 8A is an enlarged rear view showing the portion indicated by the arrow 8 in FIG. 7 (however, the stopper member and the handle are not shown), and FIG. 8B is a sectional view taken along the line bb in FIG. 8A. (C) is a sectional view taken along line 9 (c) -9 (c) in FIG. 8, and (d) is a sectional view taken along line 9 (d) -9 (d) in FIG. The stopper member is in a restricted position, and in particular, (e) is an enlarged rear view (corresponding to FIG. 8 (a)) of the load receiving table showing the portion indicated by 10 (e) in FIG. (F) is a view taken along arrow f in FIG. 10 (e). The stopper member is in the restriction release position, and particularly (g) is an enlarged rear surface of the load receiving base (10 (e) corresponding to the arrow 10 (e) in FIG. 7), and FIG. (H) is a view as viewed in the direction of arrow h in FIG. 11 (g) (corresponding to FIG. 10 (f)). 12-12 enlarged sectional view taken along line 12-12 of FIG.

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

  In this embodiment, the load receiving platform lifting apparatus according to the present invention is applied to a cargo handling vehicle with a cargo box.

  First, in FIGS. 1 to 5, a cargo box N is mounted on a body frame F of the cargo handling vehicle V, and the rear end opening of the cargo box N is an opening / closing provided at the rear end portion of the cargo box N. The door G can be opened and closed. A pair of left and right fixed frames 1 are coupled to the vehicle body frame F located immediately below the rear portion of the cargo box N with a space therebetween, and the load receiving platform lifting device A is attached to the vehicle body frame F via the fixed frames 1. . Further, an end of a bumper arm 11 a extending forward from the bumper 11 is fixed to the fixed frame 1.

  The load receiving table elevating device A includes a load receiving table T having a placement surface Tf on which a load can be placed, and a pair of left and right elevating drive devices D for moving the load up and down. In this embodiment, each elevating drive device D elevates and lowers the load receiving table T via the parallel link mechanism L that guides and supports the load receiving table T so as to be able to move up and down (more specifically, vertically swingable). And a hydraulically operated lift cylinder Cl to be driven. In the present embodiment, the vehicle body frame F is an example of a vehicle body, the fixed frame 1 is an example of an attachment member, and the parallel link mechanism L is an example of an elevating mechanism.

  Thus, the elevating drive device D moves the parallel link mechanism L up and down in conjunction with the expansion and contraction operation of the lift cylinder Cl, thereby moving the load receiving platform T between the loading platform surface Nf of the cargo box N and the ground E. It can be moved up and down while maintaining a substantially horizontal posture. And by the raising / lowering operation | movement of the load receiving stand T, the load, the cart with a caster, etc. which were mounted on the load receiving stand T can be smoothly loaded / unloaded between the ground E and the loading platform surface Nf.

  The upper end of the auxiliary link 2 is pivotally supported 2p on the fixed frame 1 so that the auxiliary link 2 can swing back and forth, and the front side edge of the auxiliary link 2 can contact and separate from the rear side edge of the fixed frame 1. Abut. The auxiliary link 2 is normally held in contact with the fixed frame 1 because the weight of the load receiving tray T or the like acts on the auxiliary link 2 at all times. In this holding state, the fixed frame 1 and the auxiliary link 2 are held. Functions as a fixed link of the parallel link mechanism L described below, so that the link form of the parallel link mechanism L is maintained.

  The parallel link mechanism L includes the above-described fixed link (that is, the fixed frame 1 and the auxiliary link 2), the upper arm 4 pivotally connected to the upper portion of the auxiliary link 2 and pivotally connected 4p, and the rear portion of the fixed frame 1. A lower arm 5 that is pivotally connected 5p so as to be swingable up and down, and a link plate 6 that is pivotally connected 4p 'and 5p' so as to be pivotable at the front ends of the upper and lower arms 4 and 5 at intervals. Is provided. Thus, the link plate 6 functions as an output end portion of the elevating drive device D, and the upper arm 4 functions as a movable portion (movable link) of the elevating mechanism (parallel link mechanism L).

  In the present embodiment, the ends of the left and right upper arms 4 are integrally connected by a connecting member 7, but this connecting member 7 can be omitted.

  Further, one end portion of the lift cylinder Cl is rotatably connected to the lower portion of the auxiliary link 2 via the first pivot P1, and the other end of the lift cylinder Cl is connected to the middle portion or the front portion of the upper arm 4. The parts are connected via a second pivot P2 so as to be rotatable. Accordingly, the upper arm 4 (parallel link mechanism L) swings upward in conjunction with the extension operation of the lift cylinder Cl to raise the link plate 6 and moves downward as the lift cylinder Cl contracts. The link plate 6 is lowered by swinging.

  In the present embodiment, the other end of the lift cylinder Cl is connected to the upper arm 4 via the second pivot P2, but the other end of the lift cylinder Cl is connected to the lower arm via the second pivot P2. 5 may be connected.

  Next, with reference to FIGS. 6 to 12 as well, attachment of the load receiving table T and its lifting / lowering drive device D and the support structure will be described.

  The load receiving platform T has a flat rectangular shape having a load placement surface Tf on the front surface, and is arranged and fixed on the back surface of the load receiving table main body Tm with a space therebetween to reinforce the load receiving table main body Tm. A pair of left and right stiffeners S extending in a direction orthogonal to the vehicle width direction, and a connecting member J that is disposed adjacent to the base end Se of each stiffener S and is fixed to the base end portion Tme of the load receiving body Tm. And the receiving stand T is connected with the link plate 6 (namely, the output end part of the raising / lowering drive device D) in the connection member J so that rotation is possible via the 3rd pivot P3. The third pivot P <b> 3 is an example of a pivot that serves as a pivot connecting portion between the link plate 6 (the output end portion of the lifting drive device D) and the load receiving table T.

  The stiffener S includes a stiffener main body Sm composed of a channel frame having a U-shaped cross section and a band plate-like cover Sc that closes the open surface of the stiffener main body Sm, and is configured by a frame having a rectangular cross section as a whole. The The outer surface of the intermediate portion of the stiffener body Sm is superposed and fixed (for example, welded) to the back surface of the load receiving body Tm, and the cover Sc is detachably fixed to the stiffener body Sm with a plurality of screws. The stiffener body Sm is formed such that the protruding height from the back surface of the load receiving body Tm gradually decreases from the base end Tme of the load receiving body Tm toward the tip.

  The connecting member J extends in a direction orthogonal to the stiffener S (the vehicle width direction), and one side f is connected and fixed (for example, welded) to the base end Se of the stiffener S. 'Are provided (for example, welded) and protrude from the other surface f', and are provided with at least two vertical plates, that is, first to third vertical plates 31 to 33 arranged in parallel in the vehicle width direction at intervals. The horizontal plate 30 closes the open surface of the proximal end Se of the stiffener S.

  The end portion 30a (front end portion in FIG. 6) of the horizontal plate 30 extends from the base end Se of the stiffener S in a more inclined posture than the horizontal plate main body portion, and is joined to the rear surface of the base end portion Tme of the load receiving base main body Tm. (For example, welding). And the edge part which the same 1st-3rd vertical board 31-33 inclined similarly is contact | abutted and fixed (for example, welding) to the edge part 30a, respectively.

  In addition, the specific at least one vertical plate (in the present embodiment, the central second vertical plate 32) has a front half portion that cooperates with the other vertical plates 31 and 33 to form a support portion for the third pivot P3. The second half portion extends long into the stiffener S through a through hole 30 h provided in the horizontal plate 30. And the extension part 32a is couple | bonded (for example, welding) with the inner surface of the stiffener main body Sm. Moreover, the extension part 32a is located in the approximate center in the width direction of the cross section (U-shaped cross section) of the stiffener main body Sm, as is apparent from FIG.

  In the present embodiment, the extending portion 32a of the second vertical plate 32 is formed in a triangular plate shape, and the long side portion is in contact with and fixed (for example, welded) to the inner surface of the stiffener body Sm. In addition, a triangular hole 32ah is formed in the center of the extending portion 32a to reduce the weight while suppressing a decrease in strength of the second vertical plate 32 as much as possible. Such a lightening hole 32ah can be omitted.

  Thus, the base end portion (that is, the first to third vertical plates 31 to 33 of the connecting member J) of the load receiving table T is pivotally connected to the upper portion of the link plate 6 via the third pivot P3. Further, a hydraulically operated hoisting cylinder Ct for raising and lowering the load receiving table T is interposed between the stiffener S on the rear surface of the load receiving table T and the upper and lower intermediate portions of the link plate 6.

  In the present embodiment, the third pivot P3 horizontally supported between the second and third vertical plates 32 and 33 and the pivot joint 4p ′ between the upper arm 4 and the link plate 6 are preferably as first as possible. Although the single shaft structure is shown by coaxially arranging the pivot supported horizontally between the second vertical plates 31 and 32, the pivots P3 and 4p 'are not necessarily arranged coaxially.

  Cylindrical members 6c and 4c respectively fixed to the upper ends of the link plate 6 and the upper arm 4 are fitted to the outer circumferences of the pivots P3 and 4p ′ so as to be relatively rotatable. The cylindrical members 6c and 4c also function as a distance collar that keeps the distance between the first to third vertical plates 31 to 33 constant.

  The hoisting cylinder Ct includes a cylinder body 51 and a rod 52 with a piston that can slide in the cylinder body 51. The base end portion of the cylinder body 51 is pivotally connected 51p to the intermediate portion in the longitudinal direction of the stiffener body Sm, and the tip end portion of the rod 52 is pivotally connected 52p to the upper and lower intermediate portion of the link plate 6. And the middle part (the rod 52 in this embodiment) of the raising / lowering cylinder Ct has penetrated the said through-hole 30h of the horizontal plate 30 of the connection member J with a play.

  Thus, when the hoisting cylinder Ct is extended, the load receiving platform T rotates in the upright direction around the third pivot P3 with respect to the link plate 6, and the storage position T1 (the mounting surface Tf becomes substantially vertical). (See the chain line in FIG. 1). Further, when the hoisting cylinder Ct is contracted from the state in which the load receiving table T is at the storage position T1, the load receiving table T is rotated about the third pivot P3 with respect to the link plate 6 in the prone direction. Therefore, if the hoisting cylinder Ct is held at the contraction limit, the load receiving platform T is held at the horizontal deployment position T2 (see the solid line in FIG. 1) where the placing surface Tf is substantially horizontal regardless of the lift position of the link plate 6. .

  By the way, when the load receiving platform T that is lowered by contraction of the lift cylinder Cl is grounded while the load receiving platform T is held at the horizontal deployment position T2 and a stopper member ST described later is held at the restriction release position ST2, the grounding is temporarily performed. Thereafter, when the lift cylinder Cl is further contracted, the auxiliary link 2 slightly swings and the parallel link mechanism L is broken. Thereby, the load receiving platform T can be tilted without being obstructed by the stopper member ST up to the inclined development position T3 (see the chain line in FIG. 1) where the mounting surface Tf is inclined downward toward the tip of the load receiving table T. By this tilting, the movement of the load between the load receiving tray T and the ground E becomes smoother.

  The load receiving table T (more specifically, the lower portions of the second and third vertical plates 32 and 33 of the left and right connecting members J) can be engaged with a stopper plate 6s fixed to the lower portion of the corresponding link plate 6. The left and right stopper members ST are rotatably coupled via the left and right support shafts Pa and Pb. In this embodiment, the stopper member ST is composed of a pair of left and right side wall plates 61 and 61 and a connecting plate 62 that integrally couples (for example, welds) each side edge of each of the side wall plates 61 and 61. It is formed in a letter shape.

  Each of the support shafts Pa and Pb includes a stepped pin having a large-diameter shaft portion 71 and a small-diameter shaft portion 72 that is coaxially connected to one end of the support shaft Pa and Pb via an annular step. The large-diameter shaft portions 71 of the support shafts Pa and Pb are horizontally mounted and connected to the second and third vertical plates 32 and 33 so as to be relatively rotatable, and a retaining ring (not shown) such as a circlip or a split pin. Therefore, the separation from the second and third vertical plates 32 and 33 is prevented.

  Further, the large-diameter shaft portion 71 penetrates through the base portions of the side wall plates 61 and 61 serving as the base portion of the stopper member ST and is fixed to the connecting plate 62. As the fixing means, in the present embodiment, the first screw b1 (see FIG. 12) that passes through the connecting plate 62 and is screwed into the large-diameter shaft portion 71 of the support shafts Pa and Pb is used. Is not limited to screwing, but may be welding, caulking, or the like. Thus, the stopper member ST is integrally rotated around the corresponding support shafts Pa and Pb and their axes by the fixing means.

  Further, the stopper member ST functions as a main stopper surface 61a whose tip surface (specifically, the tip surfaces of the side wall plates 61, 61) can come into contact with and separate from the stopper plate 6s of the link plate 6, and further the side wall. First and second sub-stopper surfaces 61b that can be engaged with the horizontal plate 30 of the connecting member J so that the flat surfaces respectively provided on the one side outer surface and the other side outer surface of the bases of the plates 61, 61 are detachable. Each functions as 61c.

  The left and right stopper members ST are selectively between a predetermined restriction position ST1 shown in FIG. 10 and a predetermined restriction release position ST2 shown in FIG. 11 by turning around the axis of the support shafts Pa and Pb. Can be rotated. When the stopper member ST is at the restriction position ST1, the main stopper surface 61a engages with the link plate 6 (stopper plate 6s), so that the load receiving platform T moves downward from the horizontal deployment position T2 to the inclined deployment position T3. When the rotation is restricted and at the restriction release position ST2, the main stopper surface 61a is not engaged with the link plate 6 (stopper plate 6s), so that it tilts from the horizontal deployment position T2 of the load receiving platform T. The downward rotation to the development position T3 side is permitted.

  Between the base side surface of the stopper member ST and the base side surface of the stiffener main body Sm, both end portions of a toggle spring 63 made of a tension spring are connected via support pins 65 and 66 respectively protruding from the base side surface. The When the stopper member ST is at the restriction position ST1 (specifically, when the first sub stopper surface 61b is engaged with the horizontal plate 30 as shown in FIG. 10F), the toggle spring 63 is provided. The urging force in one direction is applied to the stopper member ST so as to maintain the engaged state (therefore, the restriction position ST1).

  On the other hand, when the stopper member ST is at the restriction release position ST2 (specifically, when the second sub stopper surface 61c is engaged with the horizontal plate 30 as shown in FIG. An urging force in the other direction is applied to the stopper member ST so as to hold the combined state (therefore, the restriction release position ST2).

  The urging directions of the urging forces are switched when an imaginary straight line connecting the support pins 65 and 66 crosses the support axes Pa and Pb of the stopper member ST (that is, when the fulcrum is exceeded). As described above, the stopper member ST, the toggle spring 63, and the two support pins 65 and 66 cooperate with each other to form a toggle mechanism TG. By this toggle mechanism TG, the stopper member ST is released from the restriction position ST1 and the restriction release. It is selectively held at the position ST2.

  The load receiving platform T is provided with a single operation handle H for simultaneously rotating the left and right stopper members ST in the same direction by the same amount. The operation handle H has left and right end portions Ha and Hb coupled to the left and right support shafts Pa and Pb, respectively, so as not to rotate relative to each other. Therefore, the operation handle H is rotated around the axis of the support shafts Pa and Pb against the urging force of the toggle spring 63, and the stopper member ST is regulated by rotating the left and right stopper members ST. A switching operation can be selectively performed between the position ST1 and the restriction release position ST2.

  The operation handle H is integrally connected to the center grip part Hc extending linearly in the vehicle width direction along the back surface of the load receiving platform T, and both ends of the grip part Hc via the crank part Hk, and is supported on the left and right sides. The shafts Pa and Pb have left and right ends Ha and Hb that are fitted and connected to each other so as not to rotate relative to each other. In the embodiment, a single metal round pipe is bent into the shape described above. Is done.

  The left and right crank portions Hk are gently bent obliquely in the same direction from the left and right ends Ha and Hb in the same direction, and the inner ends of the respective crank portions Hk are also gently bent so that both ends of the center gripping portion Hc. Each in succession. Since the operation handle H has the crank portion Hk, the lever ratio between the operation input and the output is increased, and the rotation operation force with respect to the stopper member ST is enhanced, so that the stopper member ST can be operated lightly. Can do.

  In the hollow portions O of the left and right end portions Ha and Hb of the operation handle H, the small-diameter shaft portions 72 of the corresponding support shafts Pa and Pb are inserted and fixed. As the fixing means, in this embodiment, a second screw b2 is screwed so as to cross the peripheral walls of the end portions Ha and Hb in the radial direction and is pressed against the outer peripheral surface of the small diameter shaft portion 72 of the support shafts Pa and Pb (FIG. 12). Are used). Thus, the insertion depth dx of the support shafts Pa and Pb into the hollow portion O (that is, the amount of overlap between the support shafts Pa and Pb and the end portions Ha and Hb) loosens the second screw b2. Therefore, it can be adjusted appropriately.

  Further, when the ends Ha and Hb of the operation handle H are separated from the corresponding support shafts Pa and Pb, for example, the operation handle H is moved to the left or right side after loosening the second screw b2 (FIG. 10). The operation handle H is further moved in a direction perpendicular to the axial direction (see the two-dot chain line H ″ in FIG. 10).

  Therefore, the depth do of the hollow portion O of each end portion Ha, Hb of the operation handle H (in this embodiment, substantially matches the length of the end portions Ha, Hb), for example, moves the operation handle H to the left or right side. As a result, the left and right end portions Ha and Hb of the operation handle H are set to a depth at which they can be detached from the corresponding support shafts Pa and Pb.

  The depth do of the hollow portion O of the end portions Ha and Hb is preferably set to at least twice the insertion depth dx of the support shafts Pa and Pb into the hollow portion O. At the same time, the length of the support shafts Pa and Pb (specifically, the small-diameter shaft portion 72) protruding from the load receiving platform T (specifically, the side surface of the vertical plate 32) toward the operation handle H is similarly the insertion depth. It is desirable to set at least twice dx.

  A cross member 10 formed in a square pipe shape and extending in the vehicle width direction is fixed to the left and right fixed frames 1, and a hydraulic pressure supply unit U is accommodated in a hollow portion of the cross member 10. Although not shown, the hydraulic pressure supply unit U includes a hydraulic motor and an oil tank that are hydraulic pressure supply sources for the lift cylinder Cl and the undulating cylinder Ct, and hydraulic oil supply / discharge control from the hydraulic pressure supply source to the cylinders Cl and Ct. And a control valve for arbitrarily operating the control valve. It should be noted that the hydraulic pressure supply unit U may be disposed at an appropriate position on the vehicle body frame F outside the cross member 10.

  Next, the operation of the embodiment will be described.

  In the load receiving table lifting apparatus A of the present embodiment, the load receiving table T includes a load receiving body Tm having a load placement surface Tf on the surface, a stiffener S fixed to the back surface of the load receiving body Tm, and a proximal end of the stiffener S. And a connecting member J that is arranged adjacent to Se and is fixed to the base end portion Tme of the load receiving body Tm, and is rotatable to the output end portion 6 of the elevating drive device D via the third pivot P3. Connected. The connecting member J extends in a direction perpendicular to the stiffener S and has a horizontal plate 30 whose one surface f is connected to the base end Se of the stiffener S, and the other surface f ′ of the horizontal plate 30 fixed to the horizontal plate 30. A plurality of vertical plates 31 to 33 that protrude more and are arranged in parallel in the direction at intervals. In addition, a specific vertical plate, that is, the second vertical plate 32 forms a support portion (connecting portion) for the third pivot P3 in cooperation with the other vertical plates 31 and 33, and penetrates the horizontal plate 30. It extends into the stiffener S through the hole 30 h, and the extended portion 32 a is coupled to the stiffener S.

  Accordingly, the second vertical plate 32 in the connecting member J can be extended into the stiffener S without being divided by the horizontal plate 30, and the extension portion 32a can be coupled and integrated with the stiffener body Sm. The coupling strength between the connecting member J including the plate 32 and the stiffener S is sufficiently increased, and the rigidity strength of the entire load receiving table T can be effectively increased.

  Further, between the link plate 6 of this embodiment (that is, the output end portion of the lifting drive device D) and the intermediate portion of the stiffener S, a hoisting cylinder Ct for raising and lowering the load receiving table T with respect to the link plate 6 is interposed. An intermediate portion of the hoisting cylinder Ct (in the embodiment, the intermediate portion of the rod 52) loosely penetrates the through hole 30h. Thereby, the through-hole 30h provided in the horizontal plate 30 has a through hole for passing the second vertical plate 32 to the stiffener S side, and a main portion (a part of the cylinder body 51 and the rod 52) in the stiffener S. Since the portion of the undulating cylinder Ct that is outside the stiffener S (the remaining portion of the rod 52) can also be used as a through hole for passing the link plate 6 to the link plate 6, the structure of the device can be simplified and the cost can be reduced accordingly.

  Furthermore, according to the present embodiment, the restriction position ST1 (FIG. 10) for restricting the downward rotation of the load receiving platform T from the horizontal deployment position T2 to the inclined deployment position T3 side and the restriction release position ST2 (for allowing the downward rotation) ( 11), a single operation handle H for simultaneously rotating the left and right stopper members ST in the same direction in the load receiving table lifting apparatus A including the left and right stopper members ST that can be selectively rotated between the left and right stopper members ST. Are connected to both ends of the central linear grip part Hc and the grip part Hc via the crank part Hk, and are fixed to the support shafts Pa and Pb of the left and right stopper members ST so as not to rotate relative to each other. The ends Ha and Hb are seamlessly integrated. According to this handle structure, the operation handle H that has the crank portion Hk and can be operated lightly in relation to the lever ratio can be configured with a single component, so that cost saving and assembly workability can be improved.

  In addition, the left and right end portions Ha and Hb of the operation handle H are formed hollow, and support shafts Pa and Pb fixed to the stopper member ST are fitted and fixed in the hollow portion O, and the hollow portions O are hollow. The depth do of the portion O is sufficient to allow the end portions Ha and Hb on the other left and right sides of the operation handle H to come out of the corresponding support shafts Pa and Pb by moving the operation handle H to the left and right one side ( That is, it is set to at least twice the aforementioned insertion depth dx).

  Accordingly, even if the entire operation handle including the left and right crank portions Hk is made into a single part, and the axial mounting positions of the left and right support shafts Pa and Pb with respect to the load receiving table T are constant (that is, the load receiving table). Since the axial movement of the support shafts Pa and Pb with respect to T is restricted), the left and right end portions Ha and Hb of the operation handle and the left and right support shafts Pa and Pb can be inserted and removed without any trouble. The detachability of the operation handle H with respect to the support shafts Pa and Pb is good.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment, A various design change is possible in the range which does not deviate from the summary.

  For example, in the above-described embodiment, the elevating drive device D that elevates and lowers the load receiving table T is exemplified as having the parallel link mechanism L that guides and supports the load receiving table T so that the load receiving table T can swing up and down. The apparatus is not limited to the structure of the above embodiment. For example, instead of the parallel link mechanism, an elevating drive device having a vertical elevating type elevating mechanism for elevating and lowering the load receiving table in the vertical direction (for example, see Japanese Patent Application Laid-Open No. 2004-210217) can be used. You may apply to an apparatus. In this case, a slider 4 that is housed in a column fixed to the vehicle so as to be movable up and down and pivotally supports a load receiving table, a wire 6 that interlocks the slider 4 and the cylinder 7 and a sheave 31 that guides the wire 6 are provided. The slider 4 in the vertical lifting type lifting mechanism functions as an output end of the lifting drive.

  In the above-described embodiment, the load receiving platform T has been shown to be able to stand upright at the storage position T1 in which the mounting surface Tf is stored in the vertical position so as to be stored along the rear surface of the packing box N. The present invention may be applied to an underfloor retractable load receiving platform lifting / lowering device (see, for example, JP-A-2015-85789) that can be folded in the retracted state and stored under the rear floor of the cargo handling vehicle V.

  In the above embodiment, the load receiving platform lifting / lowering apparatus according to the present invention is applied to the baggage transporting vehicle V. However, in the present invention, the load receiving platform lifting / lowering apparatus is used for various loads other than the load transporting vehicle. You may apply to a wholesale work vehicle and a working machine.

  The hydraulically operated hoisting cylinder Ct of the above embodiment uses a single-acting cylinder with a built-in spring, but it may be replaced with a double-acting cylinder.

A ··· Loading table elevating device Cl ··· Lift cylinder Ct ··· Lifting cylinder D · Elevating drive device E ··· Ground J ··· Connecting member Nf ··· ... Load bed surface P3 ... ・ Third pivot (pivot)
S ··· Stiffener Se ··· Stiffener base T ··· Load carrier Tm ··· Load carrier main body Tme · · · Base end of load carrier main body J ··· Connection Member 6 ... Link plate (output end of lifting drive)
30 ··· Horizontal plate 30h ... Through holes 31 to 33 · · First to third vertical plates (vertical plates)
32a: Extension portion 52 of the second vertical plate (specific vertical plate)... Rod (middle portion of the undulating cylinder)

Claims (2)

A load receiving stand (T) on which a load can be placed, and the load receiving stand (T) can be used for loading and unloading loads between a load carrying surface (Nf) higher than the ground (E) and the ground (E). In the load receiving table elevating device provided with the elevating drive device (D) for elevating drive,
The load receiving table (T) includes a load receiving body (Tm) having a load placement surface (Tf) on a surface thereof, a stiffener (S) fixed to a back surface of the load receiving body (Tm), and the stiffener (S ) And a connecting member (J) which is disposed adjacent to the base end (Se) and is fixed to the base end (Tme) of the load receiving body (Tm), and the output of the elevating drive device (D) It is connected to the end (6) via a pivot (P3) so as to be rotatable,
The connecting member (J) extends in a direction orthogonal to the stiffener (S) and has a horizontal plate (30) whose one surface (f) is connected to a base end (Se) of the stiffener (S), and the horizontal plate (30) each including at least two vertical plates (31 to 33) which are fixed to (30) and protrude from the other surface (f ') of the horizontal plate (30) and are arranged parallel to each other in the above-mentioned direction.
The specific vertical plate (32) cooperates with the other vertical plates (31, 33) to form a support portion for the pivot (P3), and through holes (30h) provided in the horizontal plate (30). ) Through the stiffener (S), and the extending portion (32a) is coupled to the stiffener (S). Between the output end (6) of the lifting drive (D) and the stiffener (S), a hoisting cylinder (Ct) for rotating the load receiving platform (T) up and down with respect to the output end (6). )
2. The load receiving platform elevating device according to claim 1, wherein an intermediate portion (52) of the undulating cylinder (Ct) passes through the through hole (30 h) with a gap.

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