JP5017054B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving table lifting device.

2. Description of the Related Art As a load receiving table lifting device mounted on the rear part of a cargo vehicle or the like, there is one provided with a load receiving table on which a load is placed and a lifting device that lifts and lowers the load receiving table by power such as hydraulic pressure (for example, see Patent Document 1). In the load receiving platform lifting device, a ground load (for example, a cart) is loaded from the rear end portion of the load receiving stand, and the load on the load receiving platform is lowered to the ground via the rear end portion of the load receiving stand.
Furthermore, in this load receiving platform lifting / lowering device, in addition to loading / unloading work with the load receiving table (upper surface) in a horizontal posture, the load receiving table is directed rearward depending on the ground or the shape of the floor surface on which the work is performed. In some cases, the posture is tilted downward.
And in the load receiving platform lifting apparatus described in Patent Document 1, in order to prevent the load placed on the load receiving stand (the load placed on the carriage) from getting down to the ground without permission from the rear end of the load receiving stand. In addition, a plurality of ridges are formed on the upper surface of the load receiving table.

Japanese Patent Laid-Open No. 2004-268876 (see FIGS. 1, 3, and 4)

In the load receiving platform lifting apparatus described in Patent Document 1, the cross-sectional shape of the ridge formed on the upper surface of the load receiving pedestal is a trapezoid as shown in FIG. A load (for example, a wheel of a carriage on which a load is placed) is caught on the side surface 51, so that the load placed on the load receiving platform is prevented from falling on the ground without permission. However, since the surface 51 is an inclined surface that is gently inclined toward the rear of the vehicle with respect to the upper surface 52 of the load receiving table, the load is projected on the ridge portion so as to climb the inclined surface (surface 51). You can easily get over 50. In other words, the function of preventing the luggage from getting on the ground without permission is low.
In particular, as shown in FIG. 17, the rear end portion of the load receiving platform has a shape inclined downward toward the rear of the vehicle in order to facilitate loading and unloading of the load. For this reason, the gradient θ1 (inclination angle with respect to the horizontal) of the surface 51 is further reduced, that is, the inclination becomes gentler, and the function of preventing the luggage from going down to the ground without permission is further reduced.
In addition, when loading a load with the load receiving table inclined downward, the slope θ1 (inclination angle with respect to the horizontal) of the surface 51 is further reduced, so that it is possible to prevent the load from falling on the ground without permission. It will fall further.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a cargo receiving platform lifting device having an enhanced function of preventing a load placed on the cargo receiving platform from falling on the ground without permission. To do.

In order to achieve the above object, the present invention comprises a load receiving table and an elevating device for raising and lowering the load receiving table, and the load is placed between the ground and the load receiving table through one end of the load receiving table. A load receiving table lifting device for loading and unloading, wherein an upper surface of the end portion of the load receiving table has an uneven surface portion, and the uneven surface portion includes a mounting surface portion on which at least a part of a load is placed, and the mounting surface portion of the mounting surface portion. on the other hand and the wall portion extending upwardly from the edge of the side so as to be substantially perpendicular to the mounting surface portion, Ri, which are formed alternately towards the one side, is the mounting surface portion, the one side From the lower edge of the wall surface portion, an inclined surface extending obliquely upward toward the upper edge of the adjacent wall surface portion is provided on the other side .

  According to this load receiving table lifting device, the wall surface portion extends upward from the edge on one side of the placement surface portion so as to be substantially orthogonal, so that the load placed on the placement surface portion moves to one side. Even if it tries, it will become difficult to move a load to one side by hitting a wall surface part. Therefore, even if the upper surface of the end portion of the load receiving table is inclined downward toward one side, it is possible to prevent the load placed on the uneven surface portion from falling on the ground.

Also, the mounting surface portion, from the lower edge of the wall portion of the one side, than has an inclined surface that extends obliquely upward toward the upper edge of the wall portion of the adjacent thereto and the other side in order to load the luggage into the receiving platform on, when attempting to move a load from one side to the other side, on the asperity surface portion, the luggage not hit the wall surface portion, the surface portion mounting the package It can be moved obliquely upward along the inclined surface. For this reason, the operation | work which moves a load to the other side (work to load on a load receiving stand) can be performed easily.

Moreover, in this case, it is preferable that the inclination angle of the inclined surface is 30 ° or less with respect to the horizontal in a state where the load receiving stand is in contact with the horizontal ground.
According to this, since the inclination angle of the inclined surface is small (below 30 ° or less), the operation of moving the load to the other side (the operation of loading on the load receiving table) can be performed more easily.

  The present invention also includes a load receiving table and an elevating device that moves the load receiving table up and down, and loads and unloads the load between the ground and the load receiving table via one end of the load receiving table. In the lifting device, the upper surface of the end portion of the load receiving platform has a concavo-convex surface portion formed by forming a plurality of ridges toward the one side, and the one ridge is formed on a lower side of the one side. A first surface portion that extends from the top portion to the top portion, and a second surface portion that extends from the lower portion on the other side to the top portion, and the gradient of the second surface portion with respect to the horizontal plane is the horizontal plane of the first surface portion. Is greater than the slope for.

According to this load receiving platform lifting device, in order to load a load from the ground onto the load receiving stand, it is necessary to move the load across the peak portion constituting the uneven surface portion from one side to the other side. Since the slope of the first surface portion extending from the lower portion to the top portion of one part is smaller (than the slope of the second surface portion), the load can move over the mountain and move the load. It can be easily placed on the cradle.
And even if the load placed on the uneven surface portion tries to move to one side, the slope of the second surface portion extending from the lower portion to the top portion on the other side is larger (than the slope of the first surface portion) in the mountain portion. Therefore, it becomes difficult for the load to move to one side when the load hits the second surface portion. Therefore, even if the upper surface of the one end portion of the load receiving table is inclined downward toward the one side, it is possible to prevent the load placed on the uneven surface portion from falling on the ground.

  According to the load receiving platform lifting apparatus of the present invention, even when a load placed on the placing surface portion (first surface portion) of the uneven surface portion of the load receiving stand is about to move to one side, the load is placed on the wall surface portion (first surface). It becomes difficult to move to one side by hitting the two surface portions. As a result, it is possible to prevent the luggage placed on the cargo receiving platform from falling to the ground without permission.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an embodiment of a cargo receiving platform lifting / lowering apparatus 1 according to the present invention. The load receiving platform lifting / lowering device 1 is attached to the rear portion of a vehicle body frame 2 of a vehicle (lorry vehicle), and lifts the load receiving table 30 between the ground and a cargo box (not shown) on the vehicle body frame 2. Unload and unload your luggage.
Further, the load receiving platform lifting / lowering apparatus 1 can store the load receiving stand 30 in a storage position under the floor of the load box (below the rear portion of the vehicle body frame 2). FIG. 2 is a side view of the state in which the cargo receiving platform 30 is stored in the storage position. As will be described later, in order to store the load receiving platform 30 in this storage position, the load receiving platform 30 is composed of a plurality of load receiving platform components (two in the example, a base load receiving platform 31 and a front load receiving platform 32), It can change from the unfolding state (state of FIG. 1) in which these load receiving base components are arranged in the front-rear direction to the folded state (state of FIG. 2) overlapping in the vertical direction.

  FIG. 3 to FIG. 6 are side views for explaining the operation until the load receiving stand 30 in the folded state at the retracted position is expanded to the rear of the vehicle. The load receiving platform lifting / lowering device 1 includes a lifting / lowering device that lifts and lowers the load receiving platform 30. After the load receiving platform 30 is in the unfolded state as shown in FIG. 6, the lifting device lifts and lowers the load receiving platform 30 as shown in FIG. Can be made.

  To this end, in FIG. 4, the load receiving platform lifting / lowering device 1 is mounted with a main body frame 5 attached to the vehicle body frame 2, a load receiving stand 30 on which a load is placed, and the load receiving stand 30 attached to the main body frame 5 so as to be movable up and down. Arms 22 and 24, actuators (lift cylinder 23 and slide cylinder 37 described later) for moving the load receiving table 30 up and down and back and forth, and a power unit (not shown) for operating and controlling these actuators are provided. In this embodiment, the actuator is a hydraulic cylinder, and the power unit includes a hydraulic drive device that operates the actuator and a control device that controls the operation of the hydraulic drive device. The lifting device includes arms 22 and 24 and a lift cylinder 23.

The load receiving platform 30 includes a base load receiving platform 31 and a front load receiving platform 32 connected to the base receiving platform 31 so as to be folded (folded) or unfoldable. The front part receiving platform 32 is rotatable with respect to the base receiving table 31 by a hinge part (hereinafter referred to as a second hinge part) 25.
At the time of loading work (FIGS. 1 and 6), the front load receiving base 32 is located behind the base load receiving base 31, and the upper surface of the load receiving base 30 is moved from the base load receiving base 31 to the front receiving base 32. A mounting surface 19 (mounting surfaces 19a and 19b) that is substantially straight is formed. On the other hand, when the load receiving platform 30 is stored in the storage position (FIGS. 3 to 5) and the state in which the load receiving platform 30 is stored (FIG. 2), the front load receiving platform 32 is folded with respect to the base load receiving platform 31. It is in the state.

  In FIG. 4, the main body frame 5 includes a fixed frame 3 that is fixed to the vehicle body frame 2 and a movable frame 4 that can move in the vehicle front-rear direction with respect to the fixed frame 3. The fixed frame 3 includes rails 26 on both the left and right sides of the vehicle body frame 2, and attachment members 27 for attaching the rails 26 to the vehicle body frame 2. The front and rear of the rail 26 are supported by an attachment member 27, and the rail 26 is attached to the vehicle body frame 2 in a state of extending in the vehicle front-rear direction (horizontally).

  The movable frame 4 includes a pair of left and right support members 11, a connection member 12 that connects these support members 11 in the vehicle width direction, and an auxiliary link 13 that is attached to the support member 11. The support member 11 is attached to the rail 26 so as to be movable back and forth. In addition, the support member 11 is assembled by a plurality of members (plate members) and configured as an integral unit. The auxiliary link 13 is a plate-like member extending in the vertical direction, and is attached to the support member 11 so as to be rotatable by a shaft 10a.

  A base end portion of the upper arm 22 and a base end portion of the lower arm 24 are attached to the auxiliary link 13 and the support member 11 so as to be rotatable. The distal end portion of the upper arm 22 and the distal end portion of the lower arm 24 are attached to the link body 14 so as to be rotatable. The upper arm 22 and the lower arm 24 constitute a parallel link L in which a quadrilateral connecting the fulcrum on the base end side and the action point on the tip end side becomes a parallelogram. The link body 14 has an upper surface portion 14a extending in the left-right direction, and has mounting portions for the upper arm 22 and the lower arm 24 below the upper surface portion 14a. As shown in FIG. 1, the upper surface portion 14a is in a horizontal state in a state where the load receiving platform 30 is in the raised position (the same height as the floor surface of the cargo box). It can function as a bridging member between the platform 30 and the floor surface of the packing box (not shown).

  In FIG. 4, the base end portion of the lift cylinder 23 is attached to the auxiliary link 13 so as to be rotatable. The lift cylinder 23 is provided along the longitudinal direction of the upper arm 22, and the tip of the lift cylinder 23 is attached to a predetermined position on the tip side of the upper arm 22 so as to be rotatable. When the lift cylinder 23 expands and contracts, a torque around the base end portion can be applied to the upper arm 22. Thereby, the parallel link L can be rotated up and down.

  A load receiving table 30 (base load receiving table 31) is attached to the link body 14 via the first hinge member 15. When the lift cylinder 23 expands and contracts, the link body 14 and the load receiving platform 30 are moved up and down as shown in FIG. That is, at the rear of the vehicle body frame 2, the load receiving platform 30 is made to correspond to the floor of the cargo box (not shown) on the vehicle body frame 2 (that is, the same height as the floor of the cargo box), and the cargo receiving platform. It is possible to move up and down between a grounding position where 30 is grounded to the ground (ground).

In FIG. 4, the load receiving platform lifting / lowering apparatus 1 has a slide cylinder 37 for moving the movable frame 4 in the vehicle front-rear direction. A cylinder support member 17 extending rearward is fixed to a central portion of the connecting member 12 included in the movable frame 4 in the left-right direction. The main body of the slide cylinder 37 is fixed to the cylinder support member 17. A guide roller 18 is attached to the rear end portion of the cylinder support member 17. The guide roller 18 (and the cylinder support member 17) is present at a position below the load receiving tray 30 at the storage position.
The left and right members 16 are mounted between the left and right rails 26 of the fixed frame 3, and the cylinder mounting member 16 a is fixed to the center of the left and right members 16 in the left and right direction. One end of the slide cylinder 37 (the tip of the rod 37a) is attached to the cylinder attachment member 16a.

  Thereby, the slide cylinder 37 is configured to expand and contract in the vehicle front-rear direction. As shown in FIGS. 2 and 3, the movable frame 4 can be moved in the front-rear direction along the rail 26 with respect to the fixed frame 3 by extending and contracting the slide cylinder 37. By moving the movable frame 4 in the front-rear direction, the load receiving table 30 attached to the movable frame 4 via the arms 22, 24, the link body 14, and the like can be moved back and forth.

In the load receiving platform lifting / lowering apparatus 1 having the above-described configuration, an operation until the load receiving stand 1 is in the deployed state (FIG. 6) from the storage position (FIG. 2) will be described.
When the slide cylinder 37 extends from the state shown in FIG. 2, the folded load receiving platform 30 moves rearward of the vehicle (FIG. 3). When the lift cylinder 23 is shortened from this state, the parallel link L rotates downward and the link body 14 moves downward (FIG. 4). Thus, when the parallel link L rotates downward, the folded load receiving platform 30 is placed on the guide roller 18. That is, the back surface (the surface opposite to the surface on which the load is placed) of the front load receiving base 32 is in contact with the guide roller 18 from above. Further, since the load receiving platform 30 is rotatable with respect to the link body 14 by the first hinge member 15, the link body 14 moves downward to be in a horizontal posture in the front-rear direction (state of FIG. 3). The folded cradle 30 is gradually inclined. As a result, the load receiving stand 30 is supported from the front side of the vehicle by the guide roller 18 while being in the folded state (the state shown in FIG. 4).

  Then, the worker rotates the load receiving table 30 to the rear of the vehicle by the first hinge portion 15 to ground the base load receiving table 31 to the ground (FIG. 5). Thereafter, the worker further rotates the front load receiving tray 32 to the rear of the vehicle by the second hinge portion 25, and the front load receiving tray 32 is also brought into contact with the ground (FIG. 6). Thereby, the cargo receiving stand 30 will be in an unfolded state.

  The operation until the load receiving platform 1 in the unfolded state (FIG. 6) is set to the storage position (FIG. 2) is opposite to this, and the operator rotates the front load receiving platform 32 forward to The state is placed on the top (FIG. 5). Further, the load receiving base 30 in the folded state is rotated and twisted on the guide roller 18 (FIG. 4). Then, the lift cylinder 23 is extended to rotate the parallel link L upward. At this time, the load receiving platform 30 in the inclined posture gradually becomes a horizontal posture (FIG. 3). Then, the slide cylinder 37 is shortened, and the load receiving platform 30 is moved forward until the storage position is reached (FIG. 2).

  The configuration of the receiving platform 30 will be described. In FIG. 6, the load receiving platform 30 includes the base load receiving platform 31 and the front load receiving platform 32 attached to the base load receiving platform 31 as described above. The front part receiving platform 31 has a main body part (second main body part to be described later) 20 and a side guard (second side guard to be described later) 21 attached to the side part of the main body part 20 in the left-right direction. Yes. Furthermore, the main body 20 has a distal end 20a and a base 20b. The base portion 20b is attached to the base load receiving base 31 through a hinge member 25 so as to be rotatable. The base portion 20b can be a structure assembled with mold steel, a plate material, or the like, and the upper surface of the base portion 20b becomes a placement surface when the load receiving platform 30 is deployed. And the front-end | tip part 20a is integrally attached to this base 20b.

FIG. 13 is a cross-sectional view of the tip 20a. FIG. 13 shows a state in which the cargo receiving stand 30 is in a deployed state and is in contact with the ground. The tip portion 20a has a main body portion made of a metal (for example, aluminum alloy) block, and the upper surface of the tip portion 20a becomes a mounting surface when the load receiving table 30 is unfolded.
6 and 13, in this load receiving table lifting device, the load receiving stand 30 is in the unfolded state, and the front end portion 20 a is the rear end portion of the load receiving stand 30 in the vehicle front-rear direction. Then, the load on the ground (the carriage on which the load is loaded) is loaded from the front end portion 20a, and the load on the load receiving platform 30 is lowered to the ground through the front end portion 20a. That is, the cargo is loaded and unloaded between the ground and the load receiving table 30 through the front end portion 20 a on the rear side (one side) of the load receiving table 30. In addition to the above ground on the same plane as the wheel (not shown) of the vehicle on which the load receiving device lifting / lowering device 1 is mounted on the ground where the cargo is loaded and unloaded with the load receiving stand 30, It includes the floor of another work platform such as a platform behind the vehicle (see, for example, FIG. 15).

In FIG. 13, the tip portion 20a has an uneven surface portion 33 on its upper surface, and this uneven surface portion 33 has a function as an anti-slip surface in the direction from the front side to the rear side in the vehicle longitudinal direction. Yes. In other words, the uneven surface portion 33 can assist the load so that the load does not fall from the front end portion 20a to the ground (rearward) during the work of loading and unloading the load on the load receiving base 30. Furthermore, the uneven surface portion 33 can prevent the operator from sliding his / her foot.
Further, as shown in FIG. 13, in the side view, the distal end portion 20a has a wedge shape, and the distal end portion 20a is in a state where the load receiving platform 30 (and the distal end portion 20a) is in contact with the horizontal ground. As a whole, the upper surface of this is a surface inclined downward toward the tip (rear).

  The concavo-convex surface portion 33 formed on the upper surface of the distal end portion 20a is easy to move (easy to slide) toward the front side (the left side in FIG. 13) of the load receiving platform 30, but the rear side (FIG. 13). The shape (saw blade shape) is difficult to move toward (to the right side of). The uneven surface portion 33 makes it possible to prevent the load from slipping off, and to load the load on the load receiving table 30 so that the load slides from the tip 20 a of the load receiving table 30, or to place the carriage on the front end of the load receiving table 30. The work of rolling with 20 wheels from 20a becomes easy.

  A specific configuration of the uneven surface portion 33 will be described. In addition, it demonstrates as the state which grounded the receiving platform 30 to the ground (ground) which is horizontal. The concavo-convex surface portion 33 is composed of a plurality of mountain portions 35 formed continuously toward the rear side. FIG. 14 is an enlarged cross-sectional view of the uneven surface portion 33 (mountain portion 35). One peak portion 35 includes a mounting surface portion 38 (first surface portion) extending from the rear side low portion 35a to the top portion 35b, and a wall surface portion 39 extending from the front side low portion 35c to the top portion 35b. (Second surface portion). The placement surface portion 38 is a portion on which at least a part of the luggage (for example, the wheel 49 of the carriage) is placed. In this embodiment, the placement surface portion 38 includes a first placement surface portion 38a on the rear side and a second placement surface portion 38b on the front side that is formed continuously with the first placement surface portion 38a.

  The gradient α of the wall surface portion 39 with respect to the horizontal plane f is larger than the gradients β1 and β2 of the mounting surface portion 38 with respect to the horizontal plane f (α> β1, α> β2). According to this, in order to load a load (cart) on the load receiving table 30 from the ground, the plurality of mountain portions 35 constituting the uneven surface portion 33 are crossed from the rear side (one side) to the front side (the other side). However, the slopes β1 and β2 of the mounting surface portion 38 of the mountain portion 35 extending from the lower portion 35a on the rear side to the top portion 35b are larger than the slope α of the wall surface portion 39. Since it is small, the wheel 49 of the carriage can easily move over the mountain portions 35 and move forward, and can easily place the load on the load receiving platform 30.

  Moreover, even if the wheel 49 of the carriage placed on the uneven surface portion 33 (on the placement surface portion 38) tries to move rearward, the gradient α of the wall surface portion 39 in the adjacent mountain portion 35 on the rear side is determined by the placement surface portion. 38 is larger than the gradients β1 and β2 of 38, the wheel 49 of the carriage hits the wall surface portion 39, so that the carriage becomes difficult to move rearward. Further, the gradient α of the wall surface portion 39 is larger than the gradients β1 and β2 of the mounting surface portion 38 over the entire length of the mounting surface portion 38 in the front-rear direction. Therefore, as shown in FIG. 13, the upper surface of the front end portion 20a of the load receiving base 30 is inclined downward toward the rear side, but the cart placed on the uneven surface portion 33 falls down to the ground without permission. Can be suppressed.

  In the case of the conventional uneven surface portion shown in FIG. 17, one peak portion (ridge portion 50) includes a front side surface 51 that extends from a front lower portion to a top portion in the vehicle front-rear direction, and a rear side. And a rear side surface 53 extending from the lower part to the top part. The front portion 51 has a function of preventing the load from sliding backward. The gradient θ1 of the front portion 51 with respect to the horizontal plane is smaller than the gradient θ2 of the rear side surface 53 with respect to the horizontal plane (θ1 < θ2). That is, it is opposite to the peak portion 35 of the present invention (FIG. 14). For this reason, compared with the uneven surface portion 33 of the present invention, in the conventional uneven surface portion (FIG. 17), when a ground load is placed on the load receiving platform, the load (wheel of the carriage) is easily caught on the ridge portion 50. In addition, the luggage on the uneven surface portion easily slips down to the ground.

  The configuration of the uneven surface portion 33 of the present invention will be further described. In FIG. 14, the uneven surface portion 33 is formed by alternately arranging the mounting surface portion 38 and the wall surface portion 39 toward the rear side in the vehicle front-rear direction. The placement surface portion 38 is a portion on which a load is placed, that is, a portion on which the wheel 49 of the carriage can be placed, as shown in FIG. The wall surface portion 39 is a portion extending upward from the rear edge (the low portion 35 a) of the placement surface portion 38 so as to be substantially orthogonal to the placement surface portion 38.

  Furthermore, the mounting surface portion 38 is directed from the lower edge (the low portion 35a) of the rear wall surface portion 39 (39a) toward the upper edge (35b) of the adjacent wall surface portion 39 (39b) on the front side. And has a gentle inclined surface extending obliquely upward. In the embodiment shown in FIG. 14, the inclined surface includes a first placement surface portion 38a and a second placement surface portion 38b. Further, the inclination angles β1 and β2 of the inclined surfaces (the first placement surface portion 38a and the second placement surface portion 38b) of the placement surface portion 38 are grounded on the ground where the load receiving platform 30 is horizontal. Are set to 30 ° or less with respect to the horizontal plane f (β1 ≦ 30 °, β2 ≦ 30 °). Further, the inclination angles β1 and β2 are β1 <β2.

  Further, in the uneven surface portion 33, as shown in FIG. 13, the pitch P of the crest portions 35 is in the direction along the upper surface of the tip portion 20a. By setting the pitch P wide, the gradient of the placement surface portion 38 can be reduced, and the wheel 49 (see FIG. 14) of the carriage can be reliably placed on the placement surface portion 38. Can be suppressed by the wall surface portion 39. That is, if the pitch P of the ridges 35 is too small, the gradient of the placement surface portion 38 increases, and the two ridge portions adjacent to each other in the front-rear direction without the wheels 49 being placed on the placement surface portion 38. Two points are supported by only the top portion 35b of the wheel 35, and the wheel 49 is likely to roll backward. However, this can be prevented by setting the pitch P within the above range.

  As described above, according to the load receiving platform lifting apparatus 1 of the embodiment, the uneven surface portion 33 is formed at the tip portion 20 a of the load receiving table 30, and the wall surface portion 39 of the uneven surface portion 33 corresponds to the placement surface portion 38. Since it extends upward from the rear edge so as to be substantially orthogonal, even if the wheel 49 of the carriage mounted on the mounting surface portion 38 moves rearward, the wheel 49 hits the wall surface portion 39. This makes it difficult for the carriage to move rearward. Therefore, even if the upper surface of the front end portion 20a (see FIG. 13) of the load receiving platform 30 is inclined downward toward the rear side, it is possible to prevent the cart placed on the uneven surface portion 33 from falling on the ground. Can do.

  Further, according to the mounting surface portion 38 described above of the uneven surface portion 33, when the vehicle is to be moved forward in the vehicle front-rear direction in order to load the vehicle onto the load receiving table 30, the uneven surface portion 33 The wheel 49 of the carriage can be easily moved obliquely upward along the inclined surface of the mounting surface portion 38 without hitting the wall portion 39, and the operation of moving the carriage forward (load receiving stand) The work of loading on 30) can be performed easily. Furthermore, since the inclination angles β1 and β2 of the inclined surface of the mounting surface portion 38 are small (below 30 ° or less), the operation of moving the carriage to the other side can be performed more easily.

  Further, in the load receiving platform lifting apparatus of the present invention, the load is not loaded on the ground but between the floor surface (upper surface) of another work table 48 and the load box 47 as shown in FIG. May be taken down. In this case, depending on the height of the work table 48, the load may be loaded in a posture in which the upper surface of the load receiving table 30 is inclined downward as a whole. In such a case, the front end portion 20a at the rear end of the load receiving platform 30 is further inclined downward (as compared with the horizontal case). However, in this case, even if the wheel 49 of the carriage (see FIG. 14) tries to move rearward, the carriage 49 becomes difficult to move rearward because the wheel 49 hits the wall surface portion 39. It is possible to prevent the cart mounted on the vehicle from falling on the work table 48 without permission.

  Moreover, in the said embodiment, the peak part 35 of the uneven | corrugated surface part 33 is continuing over the full length of the left-right direction in the upper surface of the front-end | tip part 20a. In addition, the peak portion 35 may be discontinuous in the left-right direction. That is, on the upper surface of the distal end portion 20a, the crest 35 is divided (divided) into a plurality in the left-right direction, and the crests 35 adjacent in the left-right direction are displaced in the front-rear direction. Also good. In this case, a staggered pattern is formed on the upper surface of the tip portion 20a by the plurality of mountain portions 35.

The configuration of the receiving platform 30 will be further described.
FIG. 7 is a plan view of the load receiving table 30 and the link body 14, and FIG. 8 is a side view thereof. As described above, the load receiving platform 30 includes the base load receiving platform 31 connected to the link body 14 via the first hinge member 15 and the front portion connected to the base load receiving platform 31 via the second hinge member 25. And a cargo receiving platform 32.

  In FIG. 8, the link body 14 and the first hinge member 15 are connected to be rotatable by a shaft 10b, and the first hinge member 15 and the base load receiving base 31 are connected to be rotatable by a shaft 10c. . As a result, the base load receiving base 31 can be rotated about the shaft center of both the shafts 10 b and 10 c with respect to the link body 14, and the base load receiving base 31 can be folded back with respect to the link body 14.

  And the base load receiving stand 31 and the 2nd hinge member 25 are connected so that rotation is possible by the axis | shaft 10d, and the 2nd hinge member 25 and the front part load receiving stand 32 are connected so that rotation is possible by the axis | shaft 10e. . As a result, the front part receiving platform 32 can be rotated around the shaft centers of both the shafts 10 d and 10 e with respect to the base receiving platform 31, and the front receiving platform 32 is folded back with respect to the base receiving platform 31. be able to.

  Thus, from the state shown in FIG. 8, the front load receiving base 32 is folded on the base load receiving base 31, and the base load receiving base 31 is folded on the link body 14 together with the front load receiving base 32. Is in the folded state shown in FIG. That is, in the folded state, the front load receiving base 32 exists on the arms 22 and 24 (see FIG. 2) (not shown), and the base load receiving base 31 exists on the front load receiving base 31. Become. Furthermore, a part of the base load receiving table 31 is also present on the link body 14 (upper surface portion 14a).

  7 and 8, the base load receiving base 31 includes a first main body portion 28 having a placement surface 19b on which a load is placed in the unfolded state, and a load on the placement surface 19b in the unfolded state in the left-right direction. And a first side guard 29 having a side wall portion 29b for preventing the outer side from falling off. FIG. 10 is an explanatory view of the load receiving stand in the unfolded state, the upper view is an explanatory view showing a cross section of the base load receiving stand 31 as viewed from the front and rear directions, and the lower view is the view of the front load receiving stand 32 from the front and rear directions It is explanatory drawing which has shown the cross section.

The first main body 28 is configured as a flat plate-like member whose upper surface is the mounting surface 19b in the unfolded state, and is a rectangle that is long in the left-right direction in plan view (see FIG. 7).
The first side guard 29 is provided on both the left and right sides of the first main body 28. As shown in the upper view of FIG. 10, the side wall 29b of the first side guard 29 is the first side guard 29 in the unfolded state. The main body 28 is provided so as to protrude upward from the lateral side of the main body 28 with respect to the placement surface 19b.
The first side guard 29 has an attachment portion 29a attached to the first main body portion 28 in addition to the side wall portion 29b (hereinafter referred to as the first side wall portion 29b). The side wall portion 29b has a wall body 29g extending in the vertical direction of the cross section and a connecting portion 29d extending from the side surface in the left-right direction of the mounting portion 29a to the outer side in the left-right direction. It linearly extends upward from the connecting portion 29d. Due to the connecting portion 29d, a concave groove (concave portion) 34 is formed between the wall main body 29g of the first side wall portion 29b and the first main body portion 28 provided with the first side wall portion 29b. The concave groove 34 is formed as a portion surrounded by the attachment portion 29a, the connecting portion 29d, and the wall body 29g.

  The attachment portion 29a has a cross-sectional shape that opens toward the center in the left-right direction, whereby the attachment portion 29a has a recess 29c that extends in the vehicle front-rear direction. The left and right edges of the first main body 28 are fitted into the recess 29c. And the attaching part 29a and the 1st main-body part 28 are fixed with the volt | bolt which is not shown in figure. Thus, the first side guard 29 has a function of preventing the load from falling off from the base load receiving base 31 (mounting surface 19b) in the left-right direction by the first side wall portion 29b, and the attachment portion 29a. Since the left and right edges of the first main body 28 are covered from above and below and from the sides, the first main body 28 has a function of protecting the edges of the first main body 28 by the mounting portion 29a. Further, by attaching the attachment portion 29a to the edge portion of the first main body portion 28, it is possible to obtain the first side wall portion 29b that substantially prevents the load from dropping off, and assembling is simplified.

The front load receiving stand 32 prevents the second main body 20 having the placement surface 19a on which the load is placed in the unfolded state, and the load on the placement surface 19a from dropping off in the left-right direction in the unfolded state. And a second side guard 21 having a side wall portion 21b.
The second main body portion 20 is configured as a flat plate-like member whose upper surface is the mounting surface 19a in the unfolded state, and is a rectangle that is long in the left-right direction in plan view (see FIG. 7). The dimension of the second body part 20 in the left-right direction is the same (substantially the same) as that of the first body part 28 (see FIG. 10). In FIG. 10, for ease of explanation, the base load receiving base 31 and the front load receiving base 32 in the deployed state are shown side by side different from the actual configuration. The arrangement of the left and right directions of 31 and the front part receiving platform 32 is described in a uniform manner. According to FIG. 10, the base load receiving table 31 including the first side guard 29 has a dimension in the left-right direction (the length of the connecting portion 29 d) than the front load receiving table 32 including the second side guard 21 ( The width dimension is large.

And the 2nd side guard 21 is provided in the right-and-left both sides of the 2nd body part 20, and as shown in the lower figure of Drawing 10, in the deployment state, the 2nd side wall part 21b of the 2nd side guard 21 is The second main body portion 20 is provided so as to protrude upward from the side surface in the left-right direction with respect to the placement surface 19a.
In addition to the second side wall portion 21b, the second side guard 21 has an attachment portion 21a attached to the second main body portion 20, and the second side wall portion 21b is an upper portion of the attachment portion 21a and in the left-right direction. It extends upward from the end.

The attachment portion 21a has a cross-sectional shape that opens toward the center in the left-right direction, whereby the attachment portion 21a has a recess 21c that extends in the vehicle front-rear direction. The left and right edges of the second main body portion 20 are fitted into the recess 21c, and the attachment portion 21a and the second main body portion 20 are fixed by a bolt (not shown).
As described above, the second side guard 21 has a function of preventing the load from dropping off in the left-right direction by the second side wall portion 21b, and the mounting portion 21a is an edge of the second main body portion 20 in the left-right direction. Since the portion is covered from above and below and from the side, the mounting portion 21a has a function of protecting the edge portion of the second main body portion 20. Further, by attaching the attachment portion 21a to the edge of the second main body portion 20, the second side wall portion 21b that substantially prevents the load from falling off can be obtained, and the assembly is simplified.

  Then, when the load receiving table 30 is folded as shown in FIG. 9, the base load receiving table 31 is covered on the front load receiving table 32 as shown in FIG. The second side wall portion 21b of the lower front part receiving platform 32 protrudes upward, while the first side wall portion 29b of the base receiving table 31 protrudes downward.

  Further, as shown in FIG. 11, the upper base load receiving base 31 and the first side wall portion 29b cover the lower front load receiving base 32 and the second side wall portion 21b from above, The first side wall 29b of the upper base cradle 31 is configured to be located on the outer side in the left-right direction and protrude downward with respect to the second side wall 21b of the lower front cradle 32. Has been. That is, the inner side surface 29f in the left-right direction of the wall main body 29g of the first side wall portion 29b is positioned on the outer side in the left-right direction by the length of the connecting portion 29d than the outer side surface 21f in the left-right direction of the second side wall portion 21b. It has become the composition. With this configuration, the wall body 29g of the first side wall portion 29b and the second side wall portion 21b are arranged so as to be displaced in the left-right direction.

  Furthermore, as shown in FIG. 11, in this folded state, the wall main body 29g of the first side wall portion 29b of the upper base load receiving base 31 is connected to the second side wall portion 21b of the lower front end load receiving base 32. Opposing in the left-right direction (overlapping in the up-down direction). That is, the first side wall portion 29b (connecting portion 29d) covers the second side wall portion 21b from above, and also covers the (wall body 29g) from the outside in the left-right direction. Further, the length of the wall main body 29g in which the wall main body 29g is located outside the second side wall portion 21b in the left-right direction is such that the tip end portion 29e exceeds the second side wall portion 21b of the front load receiving base 32 and the mounting portion 21a. Has reached the outside in the left-right direction.

  As shown in FIGS. 7 and 9, the length of the first side wall portion 29 b of the upper base load receiving base 31 (the length in the front-rear direction) is the second of the lower front load receiving base 32. It is set longer than the length of the side wall part 21b. That is, the first side guard 29 of the base load receiving platform 31 is longer than the second side guard 21 of the front load receiving platform 32. And the connection part 29d of the 1st side wall part 29b is provided so that the 2nd side wall part 21b may be covered over the full length in the state in which the cargo receiving stand 30 is folded.

  Further, as shown in FIG. 11, in this folded state, the wall body 29g of the first side wall portion 29b of the upper base load receiving base 31 and the first main body portion 28 provided with the first side wall portion 29b are provided. The front part of the second side wall part 21b of the lower front part receiving platform 32 is accommodated in the concave groove 34 formed between the front part and the rear part. That is, the length of the second side wall portion 21b is such that the distal end portion 21e extends beyond the mounting surface 19b (in this case, the lower surface) of the base load receiving base 31 to the outside in the left-right direction of the mounting portion 29a. ing. Thereby, even if it is the folded state which made the front part receiving stand 32 and the base receiving stand 31 approached up and down, it can prevent that the 1st side wall part 29b and the 2nd side wall part 21b interfere. That is, the front load receiving base 32 and the base load receiving base 31 can be folded close to each other and folded, and the folded load receiving base 30 can be thinned in the vertical direction. Thereby, the space for storing the load receiving stand 30 in the folded state at the storage position can be reduced.

  Further, the first side wall portion 29b is present on the outer side in the left-right direction with respect to the first main body portion 28, the second side wall portion 21b is present on the outer side in the left-right direction with respect to the second main body portion 20, and In the folded state, the tip portion of the second side wall portion 21 b is accommodated in the concave portion 34 formed on the side of the first main body portion 28. That is, the side wall portions 29 b and 21 b are present outside the main body portions 28 and 20 in the left-right direction. For this reason, it can prevent that the 1st main-body part 28 and the 2nd main-body part 20 become small in the width direction. That is, it is possible to prevent the effective widths of the first main body portion 28 and the second main body portion 20 from being reduced. And the width | variety of the 1st main-body part 28 and the 2nd main-body part 20 can be made the same as the width | variety of the floor surface of the cargo box (loading platform) on the vehicle body frame 2 (refer FIG. 1).

  Furthermore, according to the embodiment, when the load receiving platform 30 is in the folded state, the wall main body 29g of the first side wall portion 29b of the upper base load receiving platform 31 is the second lower portion of the front load receiving platform 32. Other than being able to avoid interference between the first side wall part 29b and the second side wall part 21b in the folded state because it is located on the outer side in the left-right direction from the side wall part 21b and protrudes downward. In addition, the first side wall part 29b can cover the front part receiving stage 32 (a part of the second main body part 20) and the second side wall part 21b. It is possible to prevent intrusion between the base receiving platform 31.

Furthermore, since the wall main body 29g of the first side wall portion 29b overlaps with the second side wall portion 21b in the left-right direction, the wall main body 29g of the first side wall portion 29b causes the second side wall portion 21b (and the second main body portion 20). A part of the water can be covered from the left and right directions, and intrusion can be prevented even for water that comes from the left and right directions and rain that has components in the left and right directions.
As a result, in the folded state, rain water does not collect in the load receiving platform 30 (between the front load receiving platform 32 and the base load receiving platform 31), and when the load receiving platform 30 is deployed, rain water does not scatter and the cargo is loaded and unloaded. It is possible to prevent the worker who performs the work or the load from getting wet with rainwater.

FIG. 12 is a side view showing another embodiment of the load receiving table lifting device. FIG. 12 shows a state in which the load receiving stand 40 in the folded state exists at a position behind the vehicle with respect to the storage position, and is the same as the state of FIG. 3 in the above embodiment.
In the above embodiment, in order to place the load receiving table 30 in a folded state, the front load receiving table 32 is folded back to the front of the vehicle with respect to the base load receiving table 31 as shown in FIG. Although it includes a two-stage folding operation, such as folding forward, the load receiving platform 40 in FIG. 12 is in a folded state by the one-stage folding operation.

  That is, in FIG. 12, the load receiving table 40 includes a base load receiving table 41 and a front load receiving table 42, which can be folded by a hinge portion 43. Thereby, the load receiving stand 40 can change from the unfolded state to the folded state overlapping in the vertical direction. Then, by folding the front load receiving table 42 onto the base load receiving table 41 only once, the load receiving table 40 can be folded. Then, the load receiving platform 40 in the folded state can be moved to the front position of the vehicle and stored.

In the load receiving stand 40, in the folded state, the front load receiving stand 42 is on the upper side and the base load receiving stand 41 is on the lower side. In the embodiment of FIG. 12 as well, as will be described with reference to FIGS. 10 and 11, as shown by the reference numerals in parentheses, the base load receiving base 41 is composed of the main body 41a and the main body in the unfolded state. The side wall portion 41b is provided so as to protrude upward from the left and right side portions of the portion 41a and prevents the load on the placement surface from dropping off to the outside in the left and right direction. The front load receiving base 42 is provided so as to protrude upward from the left and right side portions of the main body portion 42a and the main body portion 42a in the unfolded state. And a side wall portion 42b for preventing the outer side from falling off.
In FIG. 11, in the folded state, the upper front part receiving base 42 and the side wall part 42 b cover the lower base part receiving base 41 and the side wall part 41 b from above, and the upper front part. The side wall portion 42b of the load receiving platform 42 is located on the outer side in the left-right direction and protrudes downward from the side wall portion 41b of the lower base load receiving platform 41. Furthermore, in this folded state, the side wall portion 42b is arranged to overlap the side wall portion 41b in the left-right direction.

Furthermore, the base load receiving table 41 and the front load receiving table 42 of the embodiment of FIG. 12 also have side guards 44 and 45 similar to the side guards shown in FIG. Each has the side wall portions 41b and 42b, and further, a concave portion 45 that can accommodate the front portion of the side wall portion 41b of the lower base load receiving table 41 is formed in the upper front load receiving table 42. Is formed.
In FIG. 10, the side guard 29 is described as having an attachment portion 29 a in addition to the side wall portion 29 b, but the attachment portion 29 a is omitted and the side wall portion 29 b is directly attached to the main body portion 28. It may be.

  Moreover, the load receiving platform lifting / lowering device of the present invention is not limited to the illustrated form, but may be of other forms within the scope of the present invention. In the above-described embodiment, the case where the side wall portions are provided on both sides in the left-right direction in each of the base load receiving platform and the front portion load receiving platform has been described. However, if the side wall portions are provided in at least one of the left-right direction. Good. However, in the case where the side wall portion is provided on one side in the left-right direction in the base load receiving base, it is necessary to provide the side wall portion on the one side also in the front receiving base. That is, it is necessary to provide a side wall part on the same side in the left-right direction in the base part receiving platform and the front part receiving platform.

Furthermore, although the said load receiving table raising / lowering apparatus demonstrated as a type | formula which stores a load receiving stand in the folding state, and stores in the downward direction of a packing box, it may be other than this. That is, as shown in FIG. 16, the load receiving table lifting device is of a type that stores the load receiving stand 30 as standing along the rear surface of the load box 47. Also in this case, the load receiving platform 30 can be lifted and lowered by the lifting device, and the load is placed on the ground and the load receiving platform 30 through the rear end of the load receiving stand 30 in a state where the load receiving stand 30 is grounded. To be loaded and unloaded. Note that the load receiving table lifting device shown in FIG. 15 is also of a type that stores the load receiving stand 30 as being raised along the rear surface of the load box 47.
And this load receiving stand 30 has the front-end | tip part 20a (refer FIG.13 and FIG.14) similar to the said embodiment, and the upper surface of the front-end | tip part 20a has the uneven | corrugated surface part 33. FIG. The uneven surface portion 33 in FIG. 15 has the same configuration as that of the above-described embodiment (see FIGS. 10 and 11).

It is a side view which shows one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is a side view of the state which stored the receiving stand in the storing position. It is a side view explaining the storing operation | movement and unfolding operation | movement of a cargo receiving stand. It is a side view explaining the storing operation | movement and unfolding operation | movement of a cargo receiving stand. It is a side view explaining the storing operation | movement and unfolding operation | movement of a cargo receiving stand. It is a side view explaining the storing operation | movement and unfolding operation | movement of a cargo receiving stand. It is a top view of a load receiving stand and a link body. It is a side view of a load receiving stand and a link body. It is a side view of the load receiving stand and the link body which are in the folded state. It is explanatory drawing which shows the cross section which looked at the receiving stand from the front-back direction. It is explanatory drawing which shows the cross section which looked at the receiving stand in the folded state from the front-back direction. It is a side view which shows other embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is sectional drawing of the front-end | tip part of a load receiving stand. It is an expanded sectional view of the uneven | corrugated surface part of a front-end | tip part. It is a side view which shows another embodiment of a cargo receiving stand raising / lowering apparatus. It is a side view of the vehicle provided with the load receiving table raising / lowering apparatus of FIG. It is explanatory drawing of the load receiving stand with which the conventional load receiving stand raising / lowering apparatus is provided.

Explanation of symbols

1 Cargo stand elevating device 20a Tip (one end)
30 Load receiving table 33 Uneven surface portion 35 Mountain portion 35a Low portion 35b Top portion 35c Low portion 38 Placement surface portion (first surface portion)
39 Wall surface (second surface)

Claims (3)

A load receiving platform and a lifting device for lifting and lowering the load receiving platform, and a load receiving platform lifting device for loading and unloading a load between the ground and the load receiving platform via one end of the load receiving platform,
The upper surface of the end portion of the load receiving platform has a concavo-convex surface portion, and the concavo-convex surface portion includes a placement surface portion on which at least a part of the load is placed, and an end edge on the one side of the placement surface portion to the placement surface portion. a wall portion extending upwardly so as to substantially perpendicular, Ri, which are formed alternately towards the one side,
The placing surface portion has an inclined surface extending obliquely upward from the lower edge of the wall surface portion on the one side toward the upper edge of the adjacent wall surface portion on the other side. Receiving platform lifting device. Wherein in a state where the receiving platform is grounded on the ground is horizontal, the inclination angle of the inclined surface receiving platform lifting device according to claim 1 or less 30 ° relative to the horizontal. A load receiving platform and a lifting device for lifting and lowering the load receiving platform, and a load receiving platform lifting device for loading and unloading a load between the ground and the load receiving platform via one end of the load receiving platform,
The upper surface of the end portion of the load receiving platform has a concavo-convex surface portion formed by forming a plurality of peaks toward the one side,
The one peak portion includes a first surface portion extending from the lower portion on one side to the top portion, and a second surface portion extending from the lower portion on the other side to the top portion,
The load receiving platform lifting device according to claim 1, wherein a gradient of the second surface portion with respect to a horizontal plane is larger than a gradient of the first surface portion with respect to the horizontal plane.

Images