JP2001342743A - Unloading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase versatility and facilitate handling by press-contracting a loading platform in the width direction thereof to enable attachment and detachment and adjusting the position of a movable guide by the adjustment of a screw to permit the loading platform to be used for various commercial ladders different in width. SOLUTION: This unloading device is provided with a winch device 3 and the loading platform 2. In the winch device 3, a wound transmission member 25 connected to the loading platform 2 is detachably mounted on the rung 6 of the ladder 4 to be delivered to a drum 31. In the loading platform 2, a movable guide 14 is disposed in such a manner to be mounted slidably along the longitudinal direction of the ladder 4 and fitted into a pair of frames 5 of the ladder 4 in the condition of engagement so as to adjustably constitute the inner-slope-direction position of the movable guide 14 relative to the fixed guide 16, and the movable guide 14 is constituted in such a manner as to be press-energized outward by a compression spring 15. The loading platform 2, which can be used for the various commercial ladders 4 different in inner dimension, is pressed in such a manner as to be contracted in the width direction thereof in order to be made free to be attached to/detached from the ladder 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unloading device which is used by being attached to a ladder at the time of use. In particular, the device can be detached by compressing the loading platform in its width direction, and can be attached to a ladder frame by adjusting screws. An extremely versatile and easy-to-handle unloading system that allows the position of the movable guide that engages and slides in the ladder direction to be adjusted so that the carrier can be used for various commercially available ladders with different widths. Related to the device.

[0002]

2. Description of the Related Art The dimensions of a ladder used for mounting a loading device consisting of a loading platform and a winch device naturally vary depending on the manufacturer, but the actual width of the ladder is at most about 15 mm.

[0003] Nevertheless, the loading platform of the conventional detachable unloading device does not have any adjustment mechanism capable of coping with the variation in the width of the ladder, and therefore can only be mounted on the designated ladder. If the ladder already possessed is different from the designated ladder, there is a problem that the designated ladder compatible with the unloading device must be bought again.

[0004] In addition, since the loading platform is simply connected to the winch device by placing it on a ladder leaning obliquely at the unloading point, the loading platform may be detached from the ladder when the ladder is installed at a nearly vertical angle. Therefore, there is a disadvantage that it cannot be used at an angle close to vertical.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned disadvantages of the prior art, and an object of the present invention is to make a pair of parallel frames parallel to the frame at right angles. A loading platform slidably attached to the ladder formed by a plurality of rails disposed along the longitudinal direction of the ladder, and a winding transmission member detachably mounted on the rail and fed from the drum are provided on the loading platform. In the unloading device including the connected winch device, a movable guide and a fixed guide fitted to the pair of frames are arranged on the carrier, and the position of the movable guide in the inward direction with respect to the fixed guide is configured to be adjustable. The movable guide is configured to be urged outward by a compression spring, and is pressed so as to shrink the bed in the width direction against the spring force of the compression spring to ladder the bed. By making it detachable, and by configuring the loading platform so that it can be used for various commercially available ladders with different inner dimensions, if one lifting device is prepared, it can be used for ladders of various widths on hand. It can be used detachably, and can be used for various ladders with different lengths (of course, different widths) depending on the work site on the first floor, second floor, third floor, etc. An object of the present invention is to make it possible to cope with different ladders, to dramatically increase the commercial value of the lifting device, and to make it possible for the user to use the lifting device at very low cost.

Another object of the present invention is to make the above-mentioned configuration easy to attach and detach the loading platform, and to give a sense of moderation when attaching the loading platform to the ladder, so that the worker can recognize that the loading platform is securely attached to the ladder. An object of the present invention is to improve the detachability of the carrier by removing the carrier from the ladder so that the operator can recognize that the carrier is clearly detached when the carrier is removed.

Another object is to slidably attach a pair of parallel frames along a longitudinal direction of the ladder to a ladder formed by connecting a plurality of bars arranged in parallel with the frame at right angles to each other. And a second vertical member and a second vertical member disposed in parallel with each other, comprising a winch device having a loading platform detachably attached to the crosspiece and a winding transmission member fed out of the drum and connected to the loading platform. A movable guide slidable in the direction of the horizontal axis is urged toward the first vertical member by a compression spring toward the first vertical member side of the horizontal axis. A fixed guide is attached to the second vertical member side of the horizontal axis, and a screw that is screwed to the movable guide in parallel with the horizontal axis passes through the movable guide and abuts on the first vertical member. With a packed carrier and compression The loading platform is configured to be attachable to and detachable from the ladder by pressing the loading platform to shrink in the width direction against the spring force of the spring, and the movable guide is appropriately fitted to the inner part of the frame by rotating the screw. If the difference in width is within a certain range, the position of the movable guide in the inward direction is simply adjusted with a screw. It is intended to provide a versatile unloading device which does not require reloading of a lifting device or a ladder, by simply using the loading platform without any problem. .

Still another object is to slidably attach a pair of parallel frames along a longitudinal direction of the ladder to a ladder formed by connecting a plurality of bars arranged in parallel to the frame at right angles to each other. And a second vertical member and a second vertical member disposed in parallel with each other, comprising a winch device having a loading platform detachably attached to the crosspiece and a winding transmission member fed out of the drum and connected to the loading platform. A movable guide having a concave portion formed so as to be slidable in the horizontal axis direction on the first vertical member side of the horizontal axis and to be engaged with the frame; A fixed guide having a concave portion is attached to the second vertical member side of the horizontal axis so as to be engaged with the frame, and is movable in parallel with the horizontal axis. Screw on the guide The load carrier is provided such that a screw is mounted so as to penetrate the movable guide and abut against the first vertical member, and presses the load carrier so as to contract in the width direction against the spring force of a compression spring. Is configured to be detachable from the ladder, and the position of the movable guide in the inward direction is adjustable so that the movable guide is appropriately fitted to the inner rim of the frame by rotating the screw. By configuring so that the loading platform can move up and down smoothly on the ladder without disengaging even if it is installed at an angle, while achieving the same purpose as above, when the ladder is leaned at an angle nearly perpendicular to the unloading point The purpose is to ensure that the loading platform does not come off from the ladder even if it is, and that the unloading device can be used safely regardless of its installation angle.

[0009]

In summary, the present invention (claim 1) provides a ladder comprising a pair of parallel frames connected by a plurality of bars arranged in parallel to the frame at right angles. A loading platform slidably attached along the longitudinal direction, and a winch device detachably attached to the crosspiece and having a winch device connected to the loading platform with a wrapping transmission member fed out of a drum; A movable guide and a fixed guide fitted to a frame are disposed on the carrier, and the position of the movable guide in the inner direction with respect to the fixed guide is configured to be adjustable, and the movable guide is pressed outward by a compression spring. The loading platform is configured to be biased, and the loading platform is detachably attached to the ladder by pressing the loading platform to contract in the width direction against the spring force of the compression spring. And it is characterized in that the loading platform is said glue size configured for use in various different commercial ladder.

The present invention (claim 2) provides a ladder formed by connecting a pair of parallel frames by a plurality of bars arranged in parallel to the frame at right angles to the ladder along the longitudinal direction of the ladder. A first vertically disposed parallel loading device, comprising: a loading platform movably mounted; and a winch device having a winding transmission member detachably mounted on the beam and fed from a drum and connected to the loading platform. Member and second
And a movable guide slidable in the horizontal axis direction on the side of the horizontal axis on the first vertical member side by a compression spring. And is attached to the second shaft of the horizontal axis.
A fixed guide is attached to the side of the vertical member, and a carrier is attached to a screw that is screwed to the movable guide in parallel with the horizontal axis, the screw being passed through the movable guide and attached to the first vertical member, The loading platform is configured to be detachable from the ladder by pressing the loading platform so as to contract in the width direction against the spring force of the compression spring, and the movable guide is formed by rotating the screw so that the movable guide becomes the frame. The position of the movable guide in the inward direction can be adjusted so as to fit the inner portion appropriately.

According to the present invention (claim 3), a ladder formed by connecting a pair of parallel frames by a plurality of bars arranged in parallel to the frame at right angles to each other is provided along a longitudinal direction of the ladder. A first vertically disposed parallel loading device, comprising: a loading platform movably mounted; and a winch device having a winding transmission member detachably mounted on the beam and fed from a drum and connected to the loading platform. Member and second
The vertical member is connected to the first vertical member side of the horizontal axis by a horizontal axis perpendicular thereto, and a slidable member is slidable in the horizontal axis direction, and a concave portion is formed so as to bite into the frame. A movable guide is pressed and urged in the direction of the first vertical member by a compression spring, and a pair of upper and lower movable guides is mounted, and a fixed guide is formed on the side of the second vertical member of the horizontal axis so as to be engaged with the frame. Is mounted, and a screw is screwed into the movable guide in parallel with the horizontal axis, and is provided so as to pass through the movable guide and abut on the first vertical member. The loading platform is configured to be detachable from the ladder by pressing the loading platform so as to shrink in the width direction, and the movable guide is appropriately fitted to the inner rim of the frame by rotating the screw. To do The movable guide is configured such that the position in the inward direction can be adjusted so that the loading platform can smoothly move up and down on the ladder without being detached even when the ladder is installed at an angle close to vertical. Is what you do.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. The unloading device 1 according to the present invention includes a loading platform 2 and a winch device 3 in FIG. 1, and is used by being attached to a ladder 4.

The ladder 4 is formed by connecting a pair of parallel frames 5 by a plurality of bars 6 arranged in parallel with the frames 5 at right angles, for example, a series of commercially available aluminum products. The protective member 8 on the upper end of the frame 5
And a foot 9 is attached to the lower end.

The loading platform 2 is, as shown in FIGS.
The first vertical member 11 and the second vertical member 12 which are slidably attached to the ladder 4 along the longitudinal direction of the ladder 4 and are arranged in parallel are connected to each other by a horizontal axis 13 perpendicular to these. The slidable member 14 is slidable in the direction of the horizontal axis 13 on the first vertical member 11 side of the horizontal axis 13, and is recessed so as to bite into the frame 5.
The movable guide 14 formed with “a” is pressed and urged in the direction of the first vertical member 11 by the compression spring 15 and is attached in a pair of upper and lower members, and is engaged with the frame 5 on the second vertical member side 12 of the horizontal shaft 13. A fixed guide 16 having a recess 16a formed therein is attached, and a screw 18 screwed into the movable guide 14 in parallel with the horizontal axis 13 penetrates a stupid hole 14b formed in the movable guide 14; It is formed on the same axis as 14b while securing a sufficient screwing length (about 20 mm), so that it is screwed to the screw 14c so that one end 18a thereof comes into contact with the vertical portion 11c of the first vertical member 11. It is attached.

First vertical member 11 and second vertical member 12
Are angle members having the same shape, and the horizontal portions 11a,
12a has a hook hole 1 for attaching a load 19;
1b and 12b are respectively formed at a plurality of locations having different heights. This is so that the mounting position of the load 19 can be arbitrarily selected.

The horizontal axis 13 is, as shown in FIGS.
For example, a round bar made of metal, the first vertical member 11 and the second
Are fixed to respective vertical portions 11c and 12c of the vertical member 12 by screws 20. Second vertical member 1 of horizontal axis 13
A pair of retaining rings 21 are attached to the two sides, and a fixed guide 16 is attached between the retaining rings 21, and the horizontal shaft 13 passes through the fixed guide 16.

Further, on the first vertical member 11 side of the horizontal shaft 13,
A retaining ring 22 is attached, and a compression spring 15 and a movable guide 14 that engages with and slides on the frame 5 are attached between the retaining ring 22 and the first vertical member 11. The horizontal axis 13 passes through the compression spring 15 and the movable guide 14, and the movable guide 14 can slide along the horizontal axis 13.

A lock nut 23 is screwed onto the screw 18, so that when the movable guide is set at an optimum inward direction position with respect to the ladder 4, the screw 18 can be fixed at that position. . This is because, during use, the screw 18 rotates naturally due to vibrations of the device and is tightened, and the position of the movable guide 14 in the inward direction moves inward, and the ladder 4 is loosened.
And the movable guide 14 is squeezed from the frame and the movement is not smoothed, and the stable and smooth sliding and safety of the carrier 2 over a long period of time are guaranteed. That's why.

A pair of horizontal shafts 13 are mounted above and below the first vertical member 11 and the second vertical member 12, respectively. A movable guide 14 and a fixed guide 16 are also mounted on each of them. Near the center of the member 11 and the second vertical member 12, as shown in FIG. 1, FIG. 3 and FIG.
A horizontal member 24 parallel to 1 is attached by a screw 20. At the center of the horizontal member 24, a hook mechanism 26 for connecting a wire 25 which is an example of a wrapping transmission member fed from the winch device 3 is provided.

The hook mechanism 26 attaches a pair of brackets 28 to the horizontal member 24 in a state where the wires 25 are separated from each other so that the wires 25 can be inserted thereinto, and a short side portion 29a of a hook 29 formed in a J-shape on both of the brackets 28. Are urged by the compression spring 30 to penetrate. When the hook 29 is pulled out against the compression spring 30, the wire 25 can be connected and disconnected.

As shown in FIGS. 1, 2 and 4, the winch device 3 is detachably attached to the
The electric motor 32, the gear box 33, and the drum 31 are accommodated in a case 34, and are configured to be operated by a controller (not shown). It has become.

The winch device 3 is mounted between adjacent bars 6. Under the case 34, when the winch device 3 is mounted on the ladder 4, the winch device 3 becomes thicker than the ladder 4. An engaging portion 34a is formed to engage with the lower crosspiece 6 so as not to come off in the vertical direction. Case 34
On the upper side of the hinge-type gripper 3 with a torsion spring 35
4b is formed so that when the winch device 3 is attached to the ladder 4, the upper bar 6 is securely held.

In the winch device 3, the rotation of the electric motor 32 is reduced by a worm and a worm gear (not shown) built in the gear box 33, and the rotation direction is changed and transmitted to the drum 31 to rotate the drum 31 forward and backward. This allows the wire 25 to be wound and fed. The winch device 3 does not project to the front side of the ladder 4 when attached to the ladder 4.

The present invention is configured as described above,
Hereinafter, the operation will be described. As shown in FIGS. 1 and 4, the winch device 3 includes, for example, a cross section between the cross section 6 at the highest position and the cross section immediately below the cross section 6 of the cross section 6 of the ladder 4. 6 is positioned so that the drum 31 is positioned substantially at the center of the width of the ladder 4.

With respect to the loading platform 2, first, the concave portions 14a of the upper and lower movable guides 14 are engaged with and fitted to the frame 5 of the ladder 4, respectively, and the second vertical member 12 is pressed against the spring force of the compression spring 15. When pressed and pressed against the ladder 4 while shrinking the bed 2 in the width direction, the recess 16b of the fixed guide 16 fits into the frame 5 as shown in FIGS. Then, when the wire 25 is connected to the hook device, the preparation for using the unloading device 1 is completed.

When the carrier 2 is to be removed, FIGS.
When the second vertical member 12 is pressed against the spring force of the compression spring 15 in the direction of arrow A, the movable guide 14 remains fitted to the frame 5 as shown in FIG.
4, the compression spring 15 is compressed, and the first vertical member 11 is separated from the screw 18 and extruded in the direction of arrow A. Thereby, the fitting state between the concave portion 16 of the fixed guide 16 and the frame 5 is released. When the second vertical member 12 is pulled up in the direction of arrow B in this state, the fixed guide 16
Get off.

As shown in FIG. 10, if the position of the movable guide 14 is adjusted to moderately fit into inner dimension L ₁ of the frame 5, as long as the use of ladders 4 of the same inner dimensions, the mounting of the Unloading is possible just by doing. In addition, each concave portion 14 of the movable guide 14 and the fixed guide 16
Since a and 16a are engaged with and fitted to the frame 5, even when the ladder 4 is installed at a nearly vertical angle, the bed 2 moves up and down smoothly without coming off the ladder 4.

Next, the adjustment of the movable guide 14 when attaching the carrier 2 to the ladder 4 having a different inner diameter will be described. If the screw 18 is rotated in the tightening direction after the lock nut 23 is loosened, one end 18a of the lock nut 23 is brought into contact with the vertical portion 11c of the first vertical member 11, and is pressed by the female screw 14c. The movable guide 14 is sent to the compression spring 15
The movable guide 14 and the fixed guide 16 are attached to the ladder 4 having a small inner dimension.
Can be fitted appropriately.

Conversely, if the screw 18 is rotated in the loosening direction, one end 18a of the screw 18 is turned into the vertical portion 11c of the first vertical member 11.
The movable guide 14 has an internal thread 14
c, and is separated from the fixed guide 16 by being pressed by the compression spring 15, as shown in FIG.
Even wide ladder 4 can be moderately fit the movable guide 14 and the fixed guide 16 to the inner dimension L ₂ of the frame 5.

After the adjustment is completed, if the lock nut 23 is tightened again, the screw 18 is fixed to the movable guide 14 and the position of the movable guide 14 is maintained. Can be used immediately without any adjustment after being attached to the ladder 4, and the carrier 2 is stable on the ladder 4 for a long period of time without loosening, and the movable guide 14 is mounted on the frame 5. It is possible to move up and down smoothly without fear that it will not move due to being tightened.

The unloading material 36, for example, a gypsum board,
As shown in FIG. 2, the load 19 mounted at an arbitrary height
Place on. When the winch device 3 is operated and the wire 25 is wound up, the loading platform 2 is lifted and the cargo can be unloaded. When the wire 25 is fed out, the loading platform 2 is lowered and the loading can be unloaded.

[0032]

According to the present invention, a pair of parallel frames is slid along a longitudinal direction of the ladder by connecting a pair of parallel frames with a plurality of bars arranged in parallel to the frame at right angles. A movable guide and a fixing unit fitted to a pair of frames in a discharging apparatus including a loading platform movably mounted and a winch device detachably mounted on a crosspiece and having a winding transmission member fed from a drum connected to the loading platform. A guide is disposed on the carrier, the position of the movable guide in the inward direction with respect to the fixed guide is configured to be adjustable, and the movable guide is configured to be urged outward by a compression spring. The carrier can be configured to be detachable from the ladder by pressing the carrier so as to shrink in the width direction, and the carrier can be used for various commercially available ladders having different inner dimensions. If one lifting device is prepared, it can be used by attaching and detaching it to ladders of various widths on hand, and the length can be increased by the work site on the first floor, second floor, third floor, etc. It can be used for various ladders of different widths (of course, also of different widths), and can be used for ladders of different widths that may be purchased in the future. In addition, there is an effect that the lifting device can be used at very low cost for the user.

Further, with the above configuration, the loading platform can be easily attached and detached, and the worker can recognize that the loading platform has been securely mounted on the ladder by causing a sense of moderation when the loading platform is mounted on the ladder. When the carrier is removed, the operator can recognize that the carrier is clearly detached by separating the carrier from the ladder, so that the detachability of the carrier can be improved.

A loading platform slidably mounted along a longitudinal direction of the ladder on a ladder formed by connecting a pair of parallel frames by a plurality of rails disposed in parallel to the frame in a direction perpendicular to the frame; And a winch device in which a wrapping transmission member that is detachably attached to the reel and is fed from the drum is connected to a carrier, wherein the first vertical member and the second vertical member arranged in parallel with each other are combined with each other. A movable guide slidable in the horizontal axis direction is attached to the first vertical member side of the horizontal axis by being pressed by a compression spring in the first vertical member direction and attached to the first vertical member side of the horizontal axis. Axis 2
A fixed guide is attached to the vertical member side of the first member.
Equipped with a loading platform attached to contact the vertical member of
The loading platform is configured to be detachable from the ladder by pressing the loading platform so as to contract in the width direction against the spring force of the compression spring, and by rotating the screw, the movable guide is properly fitted into the inner part of the frame. The position of the movable guide in the inward direction can be adjusted so that if the difference in width is within a certain range, the position of the movable guide in the inward direction of the movable guide is simply adjusted by a screw. Thus, it is possible to attach and use the loading platform without any problem, and as a result, it is possible to provide a highly versatile unloading device that does not require repurchase of the lifting device or the ladder.

Further, a loading platform slidably mounted along a longitudinal direction of the ladder on a ladder formed by connecting a pair of parallel frames by a plurality of bars arranged in parallel to the frame in a direction perpendicular to the frame. And a winch device in which a winding transmission member detachably attached to the crosspiece and fed out of the drum is connected to the carrier, wherein the first vertical member and the second vertical member are arranged in parallel. A movable guide having a recess formed so as to be slidable in the horizontal axis direction on the first vertical member side of the horizontal axis and to be engaged with the frame is formed by a first spring by a compression spring. A fixed guide having a concave portion attached to the second vertical member side of the horizontal axis to be pressed and urged in the direction of the vertical member and having a recess so as to bite into the frame is attached to the movable guide in parallel with the horizontal axis. I agree Comprises a carrier mounted so as to penetrate the movable guide and abut against the first vertical member, and presses the carrier in such a manner as to contract the carrier in the width direction against the spring force of the compression spring. In addition to being configured to be detachable with respect to the frame, the position of the movable guide in the inward direction can be adjusted so that the movable guide is appropriately fitted to the inner portion of the frame by rotating the screw, and the ladder is set at an angle close to vertical. Even if it is installed, the loading platform can move up and down smoothly on the ladder without disengaging, so while obtaining the same effect as above, even if the ladder is leaned at an angle close to vertical to the unloading point, the loading platform Can be stabilized without coming off the ladder, and as a result, the unloading device can be used safely regardless of its installation angle.

[Brief description of the drawings]

FIG. 1 is a perspective view of an unloading device attached to a ladder.

FIG. 2 is a perspective view showing a state where the unloading device is attached to the ladder and the unloading object is placed on the loading platform.

FIG. 3 is a perspective view of a loading platform attached to a ladder.

FIG. 4 is a plan view showing a state where the unloading device is attached to the ladder and the loading platform is raised to a position where the loading platform overlaps the winch device.

FIG. 5 is a partially cutaway perspective view showing a mounting state of a horizontal axis, a compression spring, a fixed guide, a movable guide, and the like on the carrier.

FIG. 6 is a longitudinal sectional view of a loading platform attached to a ladder.

FIG. 7 is a longitudinal sectional view showing a state in which a fixed guide of a carrier attached to a ladder is removed from a frame.

FIG. 8 is a longitudinal sectional view of a loading platform attached to a ladder.

FIG. 9 is a longitudinal sectional view showing a state in which a fixed guide of a carrier attached to a ladder is removed from a frame.

FIG. 10 is a longitudinal sectional view showing a state in which a carrier is attached to a narrow ladder.

FIG. 11 is a vertical cross-sectional view showing a state where a carrier is attached to a wide ladder.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 unloading device 2 loading platform 3 winch device 4 ladder 5 frame 6 bar 11 first vertical member 12 second vertical member 13 horizontal axis 14 movable guide 14a recess 15 compression spring 16 fixed guide 16a recess 18 screw 25 One example of wire 31 drum

Claims (3)

[Claims] A loading platform slidably mounted along a longitudinal direction of the ladder on a ladder obtained by connecting a pair of parallel frames by a plurality of bars arranged in parallel with the frame in a direction perpendicular to the frame; In a discharge device including a winch device in which a winding transmission member detachably attached to the crosspiece and fed from a drum is connected to the loading platform, a movable guide and a fixed guide fitted to the pair of frames are provided on the loading platform. Arranged, the position of the movable guide relative to the fixed guide in the inward direction is configured to be adjustable,
The movable guide is configured to be urged outward by a compression spring, and is pressed against the ladder by compressing the carrier in the width direction against the spring force of the compression spring. An unloading device, wherein the unloading device is configured to be detachable, and the loading platform is configured to be used for various commercially available ladders having different inner dimensions. 2. A loading platform slidably mounted along a longitudinal direction of the ladder on a ladder obtained by connecting a pair of parallel frames by a plurality of bars arranged in parallel to the frame in a direction perpendicular to the frame. A first vertical member and a second vertical member disposed in parallel with each other in a discharge device including a winch device in which a winding transmission member detachably attached to the crosspiece and fed from a drum is connected to the loading platform; A movable guide slidable in the horizontal axis direction on the first vertical member side of the horizontal axis is biased by a compression spring toward the first vertical member. And a fixed guide is attached to the second vertical member side of the horizontal axis, and a screw that is screwed into the movable guide in parallel with the horizontal axis passes through the movable guide and the first vertical member. Attached to abut A load carrier that is detached from the ladder by pressing the load carrier so as to contract in the width direction against the spring force of the compression spring, and rotating the screw. The unloading device is characterized in that the position of the movable guide in the inner direction is adjustable so that the movable guide is properly fitted to the inner portion of the frame. 3. A loading platform slidably mounted along a longitudinal direction of the ladder on a ladder formed by connecting a pair of parallel frames by a plurality of bars arranged parallel to the frame in a direction perpendicular to the frame. A first vertical member and a second vertical member disposed in parallel with each other in a discharge device including a winch device in which a winding transmission member detachably attached to the crosspiece and fed from a drum is connected to the loading platform; The movable guide, which is slidable in the horizontal axis direction on the first vertical member side of the horizontal axis and formed with a concave portion so as to bite into the frame, is compressed. A pair of upper and lower fixed guides are attached by being pressed and urged in the direction of the first vertical member by a spring, and a fixed guide having a concave portion formed so as to bite into the frame is attached to the second vertical member side of the horizontal axis. side A screw mounted on the movable guide in parallel with an axis, the screw being mounted to penetrate the movable guide and abut against the first vertical member; and the load is mounted against a spring force of the compression spring. The loading platform is configured to be detachable from the ladder by pressing so as to contract in the width direction, and the movable guide is fitted so as to be appropriately fitted to the inner part of the frame by rotating the screw. Discharging characterized in that the position of the guide in the inward direction is adjustable so that the loading platform can smoothly move up and down on the ladder without being detached even if the ladder is installed at an angle close to vertical. apparatus.