JP2008062862A - Load receiving platform lifting device and folding preventive device used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load receiving platform lifting device and a folding preventive device used for the same capable of preventing bending of a load receiving platform without narrowing the effective width of a truck passage of the load receiving platform. <P>SOLUTION: The load receiving platform lifting device comprises the folding type load receiving platform 8 having a load receiving platform base end 30 and a load receiving platform body part 32, and the folding preventive device 50 for preventing folding of the load receiving platform 8. The folding preventive device 50 comprises right and left base end side brackets 51 provided at a lower face rear edge part of the load receiving platform base end 30; right and left body part side brackets 52 provided at a lower face front edge part of the load receiving platform body part 32 to face the right and left base end side brackets 51; right and left latches 53 lockable to the base end side brackets 51 and the facing body part side brackets 52; a rotating shaft 54 provided at the lower face of the load receiving platform 8; right and left link mechanisms 55 connecting the rotating shaft 54 to the right and left latches 53 to convert the rotary motion of the rotating shaft 54 into the linear motion of the latches 53; and an operating lever 56 provided at the rotating shaft 54 so as to be located near the side end of the load receiving platform 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a load receiving table lifting / lowering device for supporting a loading / unloading operation of a load on a loading platform of a vehicle, and an intermediate folding preventing device used therefor.

  The load receiving platform lifting / lowering device lifts and lowers the load receiving platform between the height of the loading platform floor of the vehicle and the height of the ground, and supports loading and unloading work on the loading platform of the vehicle. There are various types of such cargo receiving platform lifting / lowering devices. For example, there is a type in which the cargo receiving platform is folded and stored in the lower part of the vehicle loading platform.

  However, in the case of a foldable cargo cradle, it is good to lift the cargo cradle up and down to load and unload the cargo, but the cargo cradle is used to bridge the platform and the platform (loading area) about the height of the cargo bed floor. In some cases, it may be impossible to keep the receiving platform in a flat state. For example, when the tip of the load receiving platform is grounded on the platform, the load receiving platform is bridged between the platform and the loading platform, and the cart (including the container with wheels) is moved back and forth between the loading platform and the platform as a bridge. There is a possibility that the weight of the load acts on the bent portion when the bag is folded, the load receiving base is bent, and the scaffolding becomes unstable.

  Therefore, among the front part and base part of the cradle connected in a foldable manner, a U-shaped restriction member is slidably provided on the side part of the base part, and at the position straddling the base part and the front part when the cargo cradle is deployed. A configuration in which the regulating member is slid and the bending operation of the tip portion with respect to the base portion is restrained by the regulating member has already been proposed (see Patent Document 1, etc.).

JP 2002-240617 A

  However, in the above prior art, since the left and right ends of the connection between the base and the tip of the load receiving table are held by the U-shaped restriction member, a part of the restriction member is overhanging the upper part of the load receiving stand and the carriage passes. It protruded into a possible area. That is, in the conventional structure in which the restriction member for preventing the folding is projected on the upper surface of the load receiving table, the caster of the carriage passing over the load receiving table may interfere with the restriction member, and the carriage passage of the load receiving table The effective range was narrowed.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a load receiving platform lifting apparatus capable of preventing the load receiving platform from being bent without reducing the effective width of the cart passage of the load receiving platform, and a medium used for the same. It is in providing a break prevention device.

  (1) In order to solve the above-described object, the present invention provides a load receiving platform lifting / lowering device for supporting a loading / unloading operation of a load on a vehicle loading platform from a deployed state with respect to the load receiving platform base end and the load receiving platform base end. A load receiving base having a load receiving base main body portion that is pivoted upward and folded, and a folding prevention device that restrains the folding operation of the load receiving base main body portion with respect to the base end portion of the load receiving base and prevents the load receiving base from being bent. The center break prevention device includes left and right base end side brackets provided at the lower rear edge of the load receiving base end portion in each of the left and right regions of the load receiving base, and the left and right base end portions. Left and right main body side brackets provided on the lower front edge of the load receiving base main body portion facing the side bracket, and left and right latches that can be locked to the base end side bracket and the main body side bracket opposite thereto , Extending from side to side A rotating shaft provided on the lower surface of the load receiving base, a left and right link mechanism for connecting the rotating shaft and the left and right latches, and converting the rotational movement of the rotating shaft into a linear movement of the latch; An operating lever is provided on the rotating shaft so as to be positioned in the vicinity of at least one of the left and right ends of the base, and the operating lever rotates the rotating shaft.

  (2) In order to achieve the above object, the present invention also provides a load receiving platform lifting / lowering device for supporting a loading / unloading operation of a load on a vehicle loading platform, a base unit fixed to the lower portion of the vehicle, a load receiving platform base end, A load receiving base having a load receiving base body which is pivoted upward and folded from the unfolded state with respect to the base of the load receiving base, the base of the load receiving base is rotatably connected to the base unit, and the load receiving base An elevating drive unit that elevates and lowers the table while maintaining a substantially horizontal posture, and a folding prevention that restrains the folding operation of the load receiving body main body from the base of the load receiving table and prevents the load receiving table from being bent And the left and right base end side brackets provided at the lower rear edge of the load receiving base end in each of the left and right sides of the load receiving base, and the left and right base ends. Against the side bracket The left and right main body side brackets provided at the front lower edge of the load receiving base main body portion and the base end side bracket so that the front end portion is inserted into and removed from the main body side bracket. Left and right latches that can be provided, a rotation shaft provided on the lower surface of the base of the load receiving base so as to extend to the left and right on the front side of the base end side bracket, and the rotation shaft and the left and right latches And a left and right link mechanism that converts the rotational motion of the rotational shaft into a linear motion of the latch, and the rotational shaft is disposed at least near one end of the left and right sides of the load receiving table, and the rotation And an operating lever for rotating the shaft.

  (3) In the above (1) or (2), preferably, the load receiving platform has stiffeners extending in the front-rear direction on both right and left sides of the lower surface, and the base end side bracket and the main body side bracket are It is fixed to the side of the stiffener.

  (4) In order to achieve the above object, the present invention also provides a load receiving base having a load receiving base end and a load receiving base main body that is turned upward and folded with respect to the load receiving base end. In the middle folding prevention device that is provided in the cargo receiving platform lifting device and that restrains the folding operation of the cargo receiving body main body portion with respect to the base of the cargo receiving platform and prevents the cargo receiving platform from being folded, the left and right regions of the cargo receiving platform Left and right base end side brackets provided at the rear lower edge portion of the load receiving base end portion, and the left and right base end side brackets provided at the lower front edge portion of the load receiving base body portion. Left and right main body side brackets, left and right latches that can be locked to the base end side bracket and the main body side brackets opposed thereto, and a rotation provided on the lower surface of the load receiving base so as to extend to the left and right Axis and this rotation axis and front Left and right link mechanisms for connecting left and right latches to convert the rotational movement of the rotary shaft into linear movement of the latch, and provided on the rotary shaft so as to be positioned at least near one end of the left and right sides of the load receiving platform. And an operating lever for rotating the rotating shaft.

  (5) In order to achieve the above object, the present invention also provides a load receiving base having a load receiving base base portion and a load receiving base body portion that is pivoted upward and folded from the unfolded state with respect to the load receiving base end portion. In the middle folding prevention device that is provided in the cargo receiving platform lifting device and that restrains the folding operation of the cargo receiving body main body portion with respect to the base of the cargo receiving platform and prevents the cargo receiving platform from being folded, the left and right regions of the cargo receiving platform Left and right base end side brackets provided at the rear lower edge portion of the load receiving base end portion, and the left and right base end side brackets provided at the lower front edge portion of the load receiving base body portion. Left and right main body side brackets, left and right latches slidably provided on each of the base end side brackets so that the front end portion can be inserted into and removed from the main body side bracket, and the base end side Left on the front side of the bracket A rotating shaft provided on the lower surface of the base of the load receiving base so as to extend to the left and right, and connecting the rotating shaft and the left and right latches, and converting the rotational motion of the rotating shaft into a linear motion of the latch And a control lever provided on the rotary shaft so as to be positioned in the vicinity of at least one end of the left and right sides of the load receiving base, and operating the rotary shaft.

  ADVANTAGE OF THE INVENTION According to this invention, the bending of a receiving stand can be prevented, without narrowing the effective width | variety of the bogie path of a receiving stand.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a state in which a load receiving table lifting device according to an embodiment of the present invention is deployed, FIG. 2 is a bottom view of the left half side of the load receiving table, and FIGS. 3 and 4 are left side views of the load receiving table. It is. In FIG. 2 to FIG. 4, a side molding on the side of the cargo receiving table and a caster stopper for preventing the cart from running away are omitted.
In the following description, it corresponds to the front, rear, left and right of the vehicle, and the directions corresponding to the upper, lower, left and right in FIG. 2 are left, right, front and rear.

  The vehicle 1 is a freight vehicle provided with a loading platform 3 at the rear of a driver's seat (not shown). The load receiving platform lifting / lowering device 100 according to the present embodiment is attached to the lower side of the rear end of the vehicle frame 4 of the vehicle 1 on which the load carrier 3 is mounted, and can be folded (stored) in the lower side of the vehicle frame 4 during traveling. It is a thing. During loading and unloading work on the loading platform 3, the loading platform 8 that is slid and protruded rearward of the vehicle frame 4 can be moved up and down between the ground and the height of the floor surface 3 a of the loading platform 3. Assisting loading and unloading of luggage and workers on the loading platform 3 according to work.

  The load receiving table elevating device 100 includes a base unit 5 fixed to the rear lower portion of the vehicle frame 4 of the vehicle 1, the load receiving table 8, and a lifting drive unit 9 that moves the load receiving table 8 up and down with respect to the base unit 5.

  Although not shown in detail, the base unit 5 has an attachment portion in which the load receiving platform lifting device 100 is attached to the lower portion of the vehicle frame 4, a slide unit supported by being suspended by the attachment portion, and a slide unit that slides in the front-rear direction. The slide unit is configured such that the slide unit slides in the front-rear direction of the vehicle 1 along the guide rail provided in the attachment portion as the slide cylinder expands and contracts. That is, when using or storing the load receiving table 8, the slide unit, the folded load receiving table 8, and the lifting drive unit 9 are integrated with the mounting portion fixed to the vehicle 1 side in the front-rear direction. To move to.

  The load receiving platform 8 includes a load receiving platform base end portion 30 supported by the elevating drive unit 9 and a load receiving platform main body portion 32 connected to the load receiving platform base end portion 30 through a hinge 31 so as to be rotatable. Yes. Both ends of the hinge 31 are connected to the vicinity of the upper surfaces of the load receiving base end 30 and the load receiving base main body 32 via pins 33 and 34 so that the hinge 31 can rotate relative to the load receiving base 30. The rotation mechanism of the load receiving table main body 32 has a double joint structure through a hinge 31. With such a configuration, the cargo receiving table main body 32 is pivoted upward and folded from the illustrated unfolded state. Further, when the load receiving base base end portion 30 and the load receiving stand main body portion 32 are in the deployed state, their postures are maintained by the mutual contact of the stopper portions 35 (see FIG. 4 and the like) at a position below the hinge 31 so that the posture is maintained. Sometimes the upper surface of the load receiving base end 30 and the upper surface of the load receiving main body 32 are continuous with each other to form a smooth surface.

  The load receiving table main body 32 is made of a hollow plate-like member having a plurality of hollow portions 36 extending in the left-right direction, and is formed so as to become thinner toward the rear end. The upper part of the cavity 36a on the rearmost side of the load receiving table main body 32 is opened, and a caster stopper (not shown) is attached to the cavity 36a. Although not particularly shown, the caster stopper is mounted in the cavity 36a via a pin, protrudes upward from the deck surface when rotating, and plays a role of stopping the carriage on the load receiving platform 8.

  The raising / lowering drive unit 9 includes an arm 40 that connects the load receiving table base end 30 to the base unit 5 so as to be rotatable in the vertical direction, and a lift cylinder 41 that moves the arm 40 up and down. The arm 40 forms a parallel link together with the other arm rotatably attached to the slide unit described above, and rotates up and down as the lift cylinder 41 expands and contracts, so that the load receiving base 8 maintains a substantially horizontal posture. Ascend and descend.

  The features of the load receiving platform lifting / lowering device 100 having the above-described configuration and operation are the configuration of the middle break prevention device 50 that restrains the folding operation of the load receiving base main body 32 with respect to the load receiving base proximal end portion 30 and prevents the load receiving stand 8 from being bent. is there.

  The middle break prevention device 50 includes a base end side bracket 51 provided at the rear lower edge of the load receiving base end 30 and the load receiving base body 32 so as to face the base end bracket 51 when the load receiving base 8 is unfolded. And a latch 53 provided slidably on the base end side bracket 51 so that the tip end portion can be inserted into and removed from the main body side bracket 52. Each of the base end side bracket 51, the main body side bracket 52, and the latch 53 is provided in each of the left and right regions (only the left region is shown in FIG. 2) of the cargo receiver 8. The base end side bracket 51 and the main body side bracket 52 are provided on the side of the stiffener 49 provided on the left and right sides of the lower surface of the load receiving base 8 (the side surface facing the outer side in the left and right direction and the lower surface of the load receiving base 8). It is fixed with bolts etc. The half-break preventing device 50 is configured to fit within the height of the stiffener 49 as a whole.

  The middle break prevention device 50 also includes a rotating shaft 54 provided on the lower surface of the load receiving base 30, a left and right link mechanism 55 that connects the rotating shaft 54 and the left and right latches 53, and an operation lever 56 that rotates the rotating shaft 54. Is further provided. The rotary shaft 54 is attached in a posture extending left and right on the front side of the base end side bracket 51 by a plurality of bearings 57 fixed to the lower surface of the load receiving base base end portion 30. Each of the left and right link mechanisms 55 includes a bell crank 60 fixed to the outer peripheral portion of the rotating shaft 54 and a rod 61 whose both ends are rotatably connected to the front end portion of the bell crank 60 and the front end portion of the latch 53. . The operation lever 56 is fixed to the outer peripheral portion of the rotating shaft 54 at substantially the same angle as the bell crank 60. In the present embodiment, the operation lever 56 is provided in the vicinity of the left end portion on the lower surface of the load receiving table 8, but is provided on the opposite side (in the vicinity of the right end portion on the lower surface of the load receiving table 8). Alternatively, it may be provided on both the left and right sides.

  With such a configuration, when the operation lever 56 is rotated backward from the unlocked state (the state shown in FIGS. 2 and 4) of the half-fold prevention device 50 after the load receiving platform 8 is deployed, the operation lever 56 is rotated. Accordingly, the rotating shaft 54 rotates. The rotational movement of the rotary shaft 54 is converted into a linear motion in the front-rear direction of the left and right latches 53 by the left and right link mechanisms 55, and the distal ends of the left and right latches 53 that are moved backward are inserted into the left and right main body side brackets 52, respectively. . In this state, even if an attempt is made to rotate the load receiving base main body 32 upward, the main body side bracket 52 fixed to the load receiving base main body 32 is locked to the latch 53, so The middle folding operation of 32 is restrained (see FIG. 3). When the load receiving base 8 is folded from the middle folding lock state of FIG. 3, the operation lever 56 is rotated forward, and the latch 53 is pulled out from the main body side bracket 52 to release the middle folding lock state of the load receiving base 8.

  According to the load receiving table lifting apparatus of the present embodiment described above, the bending break prevention device 50 can prevent the load receiving rack 8 from being bent, so that the load receiving rack 8 is surely in a flat state in a state where the middle break is locked. Can be kept in. Thereby, the stability as a scaffold of the cargo receiving stand 8 can be ensured, and safety can be improved. At this time, in this embodiment, since all the structural members of the middle break prevention device 50 are provided on the lower surface of the load receiving base 8, the passage of the carriage on the load receiving base 8 by providing the middle break prevention device 50. The workability can be improved by ensuring the worker's working space and the carriage path to the maximum without reducing the effective width of the operator.

  Further, the operation lever 56 of the half-break prevention device 50 is disposed in the vicinity of the outer side in the width direction of the load receiving table 8, and the latches 53 on both the left and right sides can be operated only by operating the operation lever 56 on either the left or right side of the load receiving table 8. Since it is linked, the operability is very good. For example, when a load receiving platform 8 is built between a floor surface 3a of the loading platform 3 of the vehicle 1 and a platform (loading site) (not shown) and the platform 10 is used as a bridge between the platform and the loading platform 3, the height of the loading platform 8 is set to an appropriate height. The operation lever 56 facing the side of the lifted load receiving platform 8 is in a position where it is easy to operate with an unreasonable posture for an operator standing on the ground, and the left and right latches 53 are interlocked so that one latch is locked. There is no need to go to the opposite side to lock the other latch, or to lock the left and right latches by two people. In addition, this interlocking structure can reliably switch the locked / unlocked state of the latches 53 on both the left and right sides, so that one can never forget to lock or forget to unlock one. To do.

  In the above, the case where the latch 53, the rotating shaft 54, the link mechanism 55, and the operation lever 56 are provided on the load receiving base end 30 side is illustrated, but these are provided on the load receiving main body 32 side, and the load receiving main body It is also conceivable that the latch 53 is locked to the bracket on the load receiving base end portion 30 side from the portion 32 side. Moreover, although the case where the present invention is applied to a load receiving platform lifting apparatus having a two-fold load receiving platform has been described as an example, the present invention is also applicable to a load receiving platform lifting apparatus having a three or more folded load receiving platform. . For example, in the case of a tri-fold type load receiving base lifting device having a load receiving base front end that bends in the same manner with respect to the load receiving base main body at the rear of the load receiving base main body in addition to the base of the load receiving base and the main body of the load receiving base. The middle break prevention device 50 can be provided not only at the connecting portion between the load receiving base end and the load receiving main body, but also at the connecting portion between the load receiving main body and the load receiving tip. Increasing the number of folds in the cargo cradle will increase the degree of convenience in improving the convenience of the locking mechanism that links the left and right.

  The case where the present invention is applied to the retractable load receiving device lifting apparatus that can be accommodated in the lower part of the rear part of the vehicle frame has been described as an example. The present invention can also be applied to other cargo receiving platform lifting devices. For example, there is a type in which the load receiving stand erects vertically during housing to form the rear side surface of the load receiving platform of the vehicle, while the load receiving stand is moved up and down in the vertical direction while maintaining a horizontal state during work. . Further, even if the load receiving platform is lifted and lowered via a parallel link in the same manner as the load receiving platform lifting apparatus of the present embodiment, the rear wall of the vehicle loading platform is not housed in the lower part of the vehicle frame. Some take a stowed posture of standing vertically along the rear door or the like. In addition, the folded cradle can be stored in the lower part of the vehicle body as in the above-described embodiment, and the unfolded cradle can be erected vertically along the rear wall of the cradle of the vehicle. It is also conceivable that a plurality of load receiving units can be accommodated in different manners depending on the situation with a single load receiving table lifting device such as a lifting device. Even when the present invention is applied to such a cargo receiving platform lifting device, the same effect as described above can be obtained.

It is a perspective view showing the state which the loading platform raising / lowering device which concerns on one embodiment of this invention developed. It is a bottom view of the left half side of the load receiving stand with which the load receiving stand raising / lowering device which concerns on one embodiment of this invention was equipped. It is a left view of the load receiving stand with which the load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention was equipped. It is a left view of the load receiving stand with which the load receiving stand raising / lowering apparatus which concerns on one embodiment of this invention was equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 3 Loading platform 5 Base unit 8 Loading platform 9 Lifting drive unit 30 Loading platform base end 32 Loading platform main body 49 Stiffener 50 Middle break prevention device 51 Base end side bracket 52 Main body side bracket 53 Latch 54 Rotating shaft 55 Link Mechanism 56 Operation lever 100 Loading platform lifting device

Claims (5)

In the loading platform lifting device that supports the loading and unloading work of the cargo on the loading platform of the vehicle,
A load receiving base having a load receiving base base portion and a load receiving base main body portion that is turned upward and folded from the unfolded state with respect to the load receiving base base end, and
A folding prevention device that restrains the folding operation of the load receiving base main body portion with respect to the load receiving base base end portion and prevents the load receiving stand from being bent;
The breakage prevention device is
Left and right base end side brackets provided at the bottom rear edge of the load receiving base end in each of the left and right regions of the load receiving base;
Left and right body part side brackets provided on the lower front edge of the load receiving base body part facing the left and right base end side brackets,
Left and right latches that can be locked to the base end side bracket and the main body side bracket opposite to the base end side bracket,
A rotating shaft provided on the lower surface of the load receiving table so as to extend to the left and right;
A right and left link mechanism that connects the rotary shaft and the left and right latches, and converts the rotary motion of the rotary shaft into the linear motion of the latch;
A load receiving base lifting device, comprising: an operating lever provided on the rotating shaft so as to be positioned in the vicinity of at least one side of the left and right sides of the load receiving base and rotating the rotating shaft. In the loading platform lifting device that supports the loading and unloading work of the cargo on the loading platform of the vehicle,
A base unit fixed to the lower part of the vehicle,
A load receiving base having a load receiving base base part and a load receiving base main body part that is pivoted upward and folded from the unfolded state with respect to the base of the load receiving base;
An elevating drive unit that rotatably connects the load receiving base base portion to the base unit, and moves the load receiving table up and down while maintaining a substantially horizontal posture, and
A folding prevention device that restrains the folding operation of the load receiving base main body portion with respect to the load receiving base base end portion and prevents the load receiving stand from being bent;
The breakage prevention device is
Left and right base end side brackets provided at the bottom rear edge of the load receiving base end in each of the left and right regions of the load receiving base;
Left and right body part side brackets provided on the lower front edge of the load receiving base body part facing the left and right base end side brackets,
Left and right latches slidably provided on each of the base end side brackets so that the front end portion is inserted into and removed from the main body side bracket;
A rotating shaft provided on the lower surface of the load receiving base end so as to extend left and right on the front side of the base end side bracket;
A right and left link mechanism that connects the rotary shaft and the left and right latches, and converts the rotary motion of the rotary shaft into the linear motion of the latch;
A load receiving base lifting device, comprising: an operating lever provided on the rotating shaft so as to be positioned in the vicinity of at least one side of the left and right sides of the load receiving base and rotating the rotating shaft.   3. The load receiving platform lifting apparatus according to claim 1 or 2, wherein the load receiving platform has stiffeners extending in the front-rear direction on both right and left sides of the lower surface, and the base end side bracket and the main body side bracket are the stiffeners. A load receiving table lifting device fixed to a side portion. It is provided in a load receiving base lifting device having a load receiving base having a load receiving base having a load receiving base having a main body and a load receiving base main body that is folded upward from the unfolded state with respect to the base of the load receiving base. In the middle break prevention device that restrains the folding operation to the base end of the load receiving stand and prevents the load receiving stand from being bent,
Left and right base end side brackets provided at the bottom rear edge of the load receiving base end in each of the left and right regions of the load receiving base;
Left and right body part side brackets provided on the lower front edge of the load receiving base body part facing the left and right base end side brackets,
Left and right latches that can be locked to the base end side bracket and the main body side bracket opposite to the base end side bracket,
A rotating shaft provided on the lower surface of the load receiving table so as to extend to the left and right;
A right and left link mechanism that connects the rotary shaft and the left and right latches, and converts the rotary motion of the rotary shaft into the linear motion of the latch;
An anti-bending device comprising: an operation lever provided on the rotating shaft so as to be positioned at least in the vicinity of the left and right end portions of the load receiving table, and operating the rotating shaft. It is provided in a load receiving base lifting device having a load receiving base having a load receiving base having a load receiving base having a main body and a load receiving base main body that is folded upward from the unfolded state with respect to the base of the load receiving base. In the middle break prevention device that restrains the folding operation to the base end of the load receiving stand and prevents the load receiving stand from being bent,
Left and right base end side brackets provided at the bottom rear edge of the load receiving base end in each of the left and right regions of the load receiving base;
Left and right body part side brackets provided on the lower front edge of the load receiving base body part facing the left and right base end side brackets,
Left and right latches slidably provided on each of the base end side brackets so that the front end portion is inserted into and removed from the main body side bracket;
A rotating shaft provided on the lower surface of the load receiving base end so as to extend left and right on the front side of the base end side bracket;
A right and left link mechanism that connects the rotary shaft and the left and right latches, and converts the rotary motion of the rotary shaft into the linear motion of the latch;
An anti-bending device comprising: an operation lever provided on the rotating shaft so as to be positioned at least in the vicinity of the left and right end portions of the load receiving table, and operating the rotating shaft.

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