JPH0575643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cargo conveyance device that can be suitably used when carrying containers into and out of a lower deck of an aircraft.

[Prior Art] For example, a lower deck of an aircraft is capable of loading containers, and a cargo transport device is used as an auxiliary device to assist in loading and unloading the containers.

By the way, conventional cargo conveyance devices, for example,
As shown in US Pat. No. 3,737,022, a notch hole is provided in the floor of the lower deck, and a conveyance roller is disposed in the notch hole so as to be protrusive and retractable. When the container is carried over the notch hole, the conveyance roller portion is rotated and protruded from the notch hole so that it can abut and support the bottom surface of the container, and in this state, the conveyance roller is driven to rotate. The container is conveyed in a fixed direction.

However, in the conventional type, the conveyance roller is pivotally supported at the tip of the rotary frame, and the conveyance roller moves up in an arc together with the rotary frame. In order to avoid interference with the floor surface, a large cutout must be provided in the floor surface. Therefore, there is a problem that there is a high risk that the operator will get stuck in the notch hole. In addition, in the case where the rotary frame is rotated to raise the conveyance roller supported at its tip, unless the frame is rotated with a large force, sufficient lifting force is applied to the conveyance roller. Since it cannot be attached, there is also the problem that the elevating mechanism becomes large and heavy. Furthermore, since the conventional device has a mechanism for lifting and locking the drive roller, the structure is complicated, and this also results in an increase in the size and weight of the device. Therefore, there is also the problem that it is unsuitable for use as an aircraft component that requires reduction in size and weight.

[Problems to be Solved by the Invention] Among the above-mentioned problems, the present invention particularly solves the problem that the notch hole is large and there is a high risk of the operator getting caught, and the problem of raising the conveyance roller. The purpose of this project is to eliminate the disadvantages of requiring a large amount of force to lift and lowering the lift, making the lifting mechanism large and heavy.

[Means for Solving the Problems] The present invention has been made by paying attention to the above-mentioned circumstances, and as conceptually shown in FIG. A conveyance roller 4 installed in the small notch 3 so as to be able to rise and fall in a direction perpendicular to the floor surface, a power transmission gear 5 that is rotatable integrally with the axis aligned with the conveyance roller 4, and this power transmission gear. A pair of pinion gears 6 are meshed with each other on both sides of the lower half of the conveyor roller 5, and the conveyor roller is provided so as to be movable back and forth in a direction substantially perpendicular to the up-and-down direction of the conveyor roller 4. 4, a pinion support mechanism 8 that holds each of these pinion gears 6 so that they can move forward and backward in a direction substantially perpendicular to the up-and-down direction of the conveyance roller 4, and a drive mechanism 7 that rotationally drives each of these pinion gears 6 and the conveyance roller 4. The connecting arm 9, which keeps the distance between the axes constant at all times, and the pair of pinion gears 6 are moved in a direction toward each other, and the power transmission gear 5 is brought into contact with the conveyance roller 4 against the cargo on the floor. It is characterized in that it is equipped with a roller lifting mechanism 11 for pushing up to a certain position. In FIG. 1, 12 is a gear that meshes with the paired pinion gears 6 to prevent the two pinion gears 6 from meshing with each other, and 13 is a guide that guides the conveyance roller 4 in the vertical direction.

[Operation] With such a configuration, as shown in FIG. 2, by bringing the pair of pinion gears 6 closer to each other, the drive mechanism 7 can be moved from the position shown in FIG. 1 to the position shown in FIG. The power transmission gear 5 meshing with the pinion gear 6 can be pushed upward while following the position, and the conveying roller 4 can be pushed up from the small notch 3 in a direction substantially perpendicular to the floor 1, thereby moving the container. It can be raised to position A where it comes into contact with. In this case, if the power transmission gear 5 is made sufficiently larger in diameter than the pinion gear 6, both pinion gears 6
The horizontal movement force applied to the power transmission gear 5 can be converted into a large upward force for the power transmission gear 5.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 3 to 5.

A cargo conveyance device 23 according to the present invention is installed below a cutout 22 provided in a floor surface 21. This cargo transport device 23 includes a transport roller 24, a power transmission gear 25, pinion gears 26, 27, a drive mechanism 28, a pinion support mechanism 29, and a connecting arm 3.
1 and a roller elevating mechanism 32. The conveyance roller 24 is installed in a notch 22 provided in the floor surface 21 so as to be able to move up and down in a direction perpendicular to the floor surface 21, and can convey the container carried onto the notch 22 by its rotation. It's getting old. The power transmission gear 25 is a large gear fixed to the support shaft 24a of the conveyance roller 24. The pinion gears 26 and 27 are a pair of small gears that mesh with both sides of the lower half of the power transmission gear 25, respectively. The drive mechanism 28 includes a motor 33 as a drive source and a transmission means 34 that transmits the rotational force of the motor 33 to the pinion gear 26. It is held by appropriate means (not shown) so that it can move forward and backward in the same direction. The pinion support mechanism 29 has a slide block 3 attached to a pair of fixed guides 35 having dovetail grooves, etc.
6 and 37, respectively, and each of these slide blocks 36 and 37 can slide in a direction parallel to the floor surface 21. and,
Support shafts 38 and 39 of the pinion gears 26 and 27 are supported by these slide blocks 36 and 37 via bearings 41 and 42, respectively. The connecting arm 31 is a link-shaped member that connects the axes of the conveying roller 24 and the pinion gear 26, and the axes of the conveying roller 24 and the pinion gear 27, respectively.
These connecting arms 31 connect the conveyor rollers 24
The distance between the axes of the pinion gears 26 and 27 is kept constant. The roller elevating mechanism 32 includes a threaded rod 43 which is disposed orthogonal to the axes of both pinion gears 26 and 27 and is supported by a slide block 36 on the drive pinion gear 26 side and is movable in the axial direction.
and a nut 44 which is screwed onto the screw-engraved portion 43a of the threaded rod 43 and is movable together with the slide block 37 on the driven pinion gear 27 side. The threaded rod 44 is configured to be able to rotate in forward and reverse directions. Specifically, a bevel gear 45 fixed to the tip of the support shaft 38, a bevel gear 46 fixed to the tip of the threaded rod 44 and meshing with the bevel gear 45 with their axes perpendicular to each other, and both of them. A housing 47 is provided to house the bevel gears 45 and 46 in constant meshing, and when the drive side pinion gear 26 is rotated by the drive mechanism 28, this rotation is transmitted to the threaded rod 43 via the support shaft 38 and the bevel gears 45 and 46. The threaded rod 43 is configured to rotate forward or backward depending on the direction of rotation of the pinion gear 26. Incidentally, when the conveyance roller 24 rotates in the cargo conveyance direction, the threaded rod 43 is set so that its tip rotates in a direction toward the nut 44. Note that a sliding portion 48 without a screw is provided at the tip of the threaded rod 43 to prevent the nut 44 and the tip of the threaded rod 43 from approaching to a distance where the pinion gears 26 and 27 mesh with each other. Reference numeral 49 denotes a nut return mechanism, which includes a presser plate 51 slidably fitted into the sliding portion 48 and a spring 52 that presses the presser plate 51 toward the proximal end of the threaded rod 43. The nut 44 is pressed against the screw carved part 43a by the spring 52 via the presser plate 51, so that when the threaded rod 43 rotates in the reverse direction, the nut 44 in the sliding part 48 is immediately screwed into the screw.

Next, the operation of this embodiment will be explained.

At the start of cargo conveyance work, the motor 33 of the drive device 28 is rotated in a predetermined direction, and this rotation is transmitted to the drive-side pinion gear 26 via the transmission means 34, causing the pinion gear 26 to rotate. Then,
The power transmission gear 25 screwed into this pinion gear 26 rotates, and furthermore, this power transmission gear 25
The conveyance roller 24 rotates in the cargo conveyance direction together with the conveyance roller 24 . On the other hand, as the pinion gear 26 rotates, the support shaft 38, bevel gear 45, and bevel gear 46 also rotate, and this rotation causes the threaded rod 43 to tighten into the nut 44.
Rotate in the direction of screwing forward. The nut 44 is biased by this rotation and slides toward the tip of the threaded rod 43. Then, the slide block 37 slides together with the nut 44 on the fixed guide 35 to the slide block 36. Further, along with this sliding, the pinion gear 27 slides in the direction of the pinion gear 26. On the other hand, threaded rod 4
3 moves in the direction of the nut 44 due to the biasing force in the opposite direction applied by the nut 44, and with this movement, the pinion gear 26 also moves in the direction of the pinion gear 27 via the bevel gears 46, 45, slide block 38, and shaft 38. Slide.
At this time, the drive mechanism 28 is also stopped in the same direction via the transmission means 34. Therefore, pinion gears 26 and 27 will approach each other.
When the pinion gears 26 and 27 approach each other in this manner, the power transmission gear 25 is pushed up by this approach, and the conveyance roller 24 is accordingly raised in a direction substantially perpendicular to the floor surface 21. Then, it protrudes from the notch 22 and rises to a position on the floor surface 21 where the container passes, and rotates to convey the container (not shown). In addition, both pinion gears 26,
27 approaches until the conveyance roller 24 rises to the position where the container passes, the nut 44 reaches the sliding portion 48 of the threaded rod 43, and the threaded engagement between the nut 44 and the threaded rod 43 is released, and the nut 44 is no longer Doesn't slide. Therefore, both pinion gears 26 and 27 do not approach each other any further, and therefore, both pinion gears 26 and 27 do not mesh with each other and are not damaged. Note that when lowering the conveyance roller 24, if the motor 33 is rotated in the reverse direction, the threaded rod 43 is rotated in the reverse direction via the pinion gear 26, the support shaft 38, and the bevel gears 45, 46, and the tip of the threaded rod 43 and the nut are rotated in the opposite direction. 4
4, the pinion gears 26 and 27 are moved apart, and the conveyance roller 24 is lowered. At this time, the nut 44 is pressed against the screw by the spring 52 via the presser plate 51, so that when the threaded rod 43 rotates in the opposite direction, it is immediately screwed into the screw. Therefore, the threaded rod 43 rotates and the pinion gears 26, 27
The problems mentioned above will not occur unless they are spaced apart.

In this way, cargo is transported, and according to this embodiment, the pair of pinion gears 2
6 and 27 are brought closer to each other, the conveying roller 24 is pushed up in a direction substantially perpendicular to the floor surface 21 and brought into contact with the container. Therefore, the notch 22 only needs to be slightly larger than the conveyance roller 24, and the notch 22 can be made much smaller than the conventional one. Therefore, there is little risk that the operator will get stuck in the notch 22. Further, since the pinion gears 26 and 27 are brought close together to push up the conveyance roller 24 in a direction substantially perpendicular to each other, the pushing up can be performed with a small force. Moreover, since there is no part of the transmission system that utilizes friction, the power transmission efficiency is higher than those that utilize friction. Furthermore, in this embodiment, since the drive mechanism 28 for rotating the conveyance roller 24 is also used to push up the conveyance roller 24, it is not necessary to provide a special drive source to raise the conveyance roller 24. This allows the device to be made smaller and lighter. In addition, the roller lifting mechanism 32 has a threaded rod 4.
3 and the nut 44 are screwed together and moved forward and backward, the conveying roller 24 can be held in an elevated state without providing a locking mechanism, and the structure is that simple.

Note that the present invention is of course not limited to the embodiments described above, and the configuration of the drive mechanism is not limited to the embodiments described above.

Further, the pinion support mechanism is not limited to one consisting of a slide block and a fixed guide, and for example,
A shaft that can slide integrally with the pinion gear may be slidably fitted into a groove provided in a direction substantially perpendicular to the up-and-down direction of the conveyance roller.

Furthermore, the configuration of the roller elevating mechanism is not limited to the above embodiment, and for example, a drive source other than the drive mechanism may be used to move the pinion gears toward and away from each other.

In addition, various modifications can be made without departing from the spirit of the present invention.

[Effects of the Invention] As explained above, the present invention can reduce the risk of workers getting their feet caught by making the cutout in the floor smaller, and also has a simple structure and can be made smaller and lighter. Moreover, since there is no part in the transmission system that uses friction, it is possible to provide a cargo conveyance device that is more efficient than one that uses friction.

[Brief explanation of the drawing]

FIG. 1 is a diagram conceptually showing the present invention, and FIG. 2 is an explanatory diagram of its operation. Figures 3 to 5 show an embodiment of the present invention, with Figure 3 being a perspective view, Figures 4 and 5.
The figure is a front view showing the roller lifting mechanism. 1, 22... Cargo conveyance device, 2, 21... Floor, 3, 22... Notch, 4, 24... Conveyance roller, 5, 25... Power transmission gear, 6, 26, 27
... Pinion gear, 7, 28 ... Drive mechanism, 8,
29... Pinion support mechanism, 9, 31... Connection arm, 11, 32... Roller lifting mechanism.

Claims (1)

[Claims] 1. A conveyance roller installed in a notch in the floor surface and capable of being raised and lowered in a direction perpendicular to the floor surface, a power transmission gear that is rotatable integrally with the conveyance roller with its axis aligned with the conveyance roller, and this power transmission gear. A pair of pinion gears are meshed with both sides of the lower half of the gear, and the conveying roller is rotatably driven through one pinion gear and a power transmission gear, which are provided so as to be movable back and forth in a direction substantially perpendicular to the up-and-down direction of the former conveying roller. a drive mechanism, a pinion support mechanism that holds each of these pinion gears so that they can advance and retreat in a direction substantially perpendicular to the vertical direction of the conveyance roller, and a connection that maintains a constant distance between the axes of each of these pinion gears and the conveyance roller at all times. It is characterized by comprising an arm and a roller lifting mechanism that moves the pair of pinion gears in a direction toward each other and pushes up the power transmission gear to a position where it comes into contact with the cargo on the floor surface of the transport roller. Cargo transport equipment.