JPH053487Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a winding device for a sheet for a vinyl greenhouse that winds up a ventilation sheet that constitutes a part of a greenhouse.

<Prior Art> FIG. 8 is a perspective view of a plastic greenhouse 20.
This vinyl house 20 has two ventilation sheets on both sides to adjust the temperature and humidity inside the greenhouse.
1 is stretched, and a sheet winding device 30 for winding up and pulling out the ventilation sheet 21 is provided. FIG. 9 is a sectional view of a conventional example of this winding device. A casing 32 is attached to be movable along the column 22 via a support roller 31 that presses against the inside of the column 22, and a rotating shaft 33 to which the winding shaft 23 of the ventilation sheet 21 is connected is attached to the casing 32. is adapted to rotate integrally with the ratchet 34. A handle 35 is attached to this rotating shaft 33, and by rotating the handle 35, the sheet 21 is wound up and pulled out. In order to prevent rotation of the ratchet 34 and rotating shaft 33, a lock lever 36 is provided which meshes with the ratchet 34.

Such a sheet winding device 30 is capable of winding or pulling out the sheet 21 by pulling up the lock lever 36 in the direction of arrow A to disengage it from the ratchet, and then rotating the handle 35 clockwise or counterclockwise. This is what we do.

<Problems to be solved by the invention> Therefore, in the conventional device, the lock lever 3
The operation was troublesome because the handle 35 had to be rotated after releasing 6. Moreover, when the lock lever 36 is released, if the handle 35 is not held in place by hand, the handle 35 will unexpectedly rotate at the same time as the release due to the weight of the seat, which is dangerous. Furthermore, since winding is performed using the ratchet 34, only step-by-step operations are possible, making detailed tensioning impossible.

<Means for Solving the Problems> The present invention has been made in consideration of the above problems, and is easy to operate, does not cause accidental rotation of the handle,
To provide a winding device for a sheet for a greenhouse that can be finely adjusted.

For this reason, the winding device for plastic greenhouse sheets of the present invention uses the fact that when force is applied to the coil spring in the winding direction, the diameter decreases, and when force is applied in the opposite direction, the diameter expands. It is designed to take up, pull out, and lock the sheet.

That is, in the present invention, the driven shaft to which the take-up shaft for winding the sheet is connected and the drive shaft to which the handle is connected have a double tube structure, and the coil springs linked to these driven shafts and the drive shaft is installed, and the rotation of the driven shaft or drive shaft causes the coil spring to expand and contract to lock or release the lock, and is prevented from rotating relative to the support by rollers that press against both sides of the support. A winding device for a plastic greenhouse sheet is mounted movably along a support via a winding device, wherein the driven shaft and the driving shaft are inserted into a fixed pipe built in a casing, and the coil spring is connected to the fixed pipe. A roller is wound to a diameter larger than the inner diameter of the support shaft and inserted into the fixed pipe, and a roller located on one side of the support is attached to the outer periphery of the fixed pipe so as to be coaxial with the driven shaft and the drive shaft. It is characterized by

<Example> Hereinafter, one embodiment of the present invention will be explained in detail with reference to the accompanying drawings. Figures 1, 2, and 3 are sectional views, front views, and side views of one embodiment of the present invention. be.

The casing 10 is movably attached to the support 14 via rollers 6 and 7 that press against both sides of the support 14, and a fixed pipe 1, a coil spring 2, a driving shaft 3, and a driven shaft 4 are installed inside the casing 10.
is installed. Fixed pipe 1 is casing 1
It is fixed by means such as welding to brackets 9 provided at the front and rear of the frame 0, and is located in a direction perpendicular to the support column 14. A roller 7, which presses against one side of the support column 14, is freely rotatably fitted onto the fixed pipe 1. The drive shaft 3 and the driven shaft 4 are inserted coaxially from openings at both ends of the fixed pipe 1. Both the drive shaft 3 and the driven shaft 4 are made of cylinders, and the end of the drive shaft 3 inside the fixed pipe 1 has a large diameter, and the end of the driven shaft 4 is inserted into this end. Therefore, the fixed pipe 1 has a double pipe structure. Here, the driven shaft 4 is equipped with a plastic greenhouse sheet (hereinafter simply referred to as a sheet).
A take-up shaft (not shown) on which the driven shaft 4 is wound is connected, and when the driven shaft 4 rotates, the sheet is wound onto the take-up shaft or pulled out from the take-up shaft.

On the other hand, a handle is connected to the drive shaft 3. FIG. 4 is a plan view of an example of such a handle 15, in which a gripping rod 15b and an engaging rod 15c are inserted into the drive shaft 3 at both ends of the continuous rod 15a, and attached to the drive shaft 3 with a pin or the like. It is becoming more and more common. The coil spring 2 is provided between the drive shaft 3 and the fixed pipe 1, and is wound so that the outer diameter of the coil portion is slightly larger than the inner diameter of the fixed pipe 1. Therefore, the coil spring 2 is in pressure contact with the inner surface of the fixed pipe 1, and a frictional force is generated between the coil spring 2 and the fixed pipe 1. In this example,
This coil spring 2 is made of cotton material with a rectangular cross section, and is designed to ensure pressure contact with the inner surface of the fixed pipe 1.

Hook portions 2a and 2b at both ends of the coil spring
engages with the drive shaft 3 and driven shaft 4 to rotate and lock the driven shaft 4. FIG. 5 is a sectional view showing such an engaged state, in which a pair of slits 3a, 3b and 4 are provided on the drive shaft 3 and the driven shaft 4, respectively.
a, 4b are opened, and the upper slits 3a, 4
The hook portion 2a at one end of the coil spring 2 is inserted into the hole a, and the hook portion 2b at the other end is inserted into the lower slits 3b and 4b.

In FIG. 1, 5 is a bearing inserted into the fixed pipe 1 to position the coil spring 2, the drive shaft 3, and the driven shaft 4, and 8 is a cylindrical shaft serving as the rotation axis of the roller 6. Incidentally, the casing 10 is tightened with screws 11 and 12 and a nut 13.

With this configuration, the sheet is wound up by rotating the handle 15 and rotating the drive shaft 3 in the direction of arrow A in FIG. 6. As the drive shaft 3 rotates, the right end surface of the upper slit 3a of the drive shaft 3 comes into contact with the hook portion 2a at one end of the coil spring 2, and presses the hook portion 2a in the same direction.
Since this pressing direction is the winding direction of the coil spring 2, the diameter of the coil portion of the coil spring 2 is reduced, the frictional force with the fixed pipe 1 is eliminated, and the hook portion 2a is inserted into the upper slit 4a of the driven shaft 4. Touch the left end face and press it. Therefore, the driven shaft 4 rotates in the same direction, and the winding shaft connected to the driven shaft 4 rotates to wind up the sheet. This sheet is wound up when the casing 10 passes through the rollers 6 and 7 to the support 1.
This is done while moving along 4. This will be explained with reference to FIG. 8. Reference numerals 22 and 30 in FIG.
are the strut 14 and the casing 1 of this embodiment, respectively.
0, and the sheet 21 is wound up while the casing 10 moves upward along the column 14.

The seat can then be pulled out by rotating the handle in the opposite direction. Due to this rotation, the left end surface of the lower slit 3b of the drive shaft 3 presses the hook portion 2b at the other end of the coil spring 2, so that the diameter of the coil spring 2 is reduced and the driven shaft 4 is brought into contact with the hook portion 2b. rotates in the same direction and the sheet is pulled out. The sheet is also pulled out while the casing 10 is moved along the support column 14 via the rollers 6 and 7 in the same manner as the above-described winding. To explain this with reference to FIG.
0) is pulled out while moving downward along the column 14 (reference numeral 22 in FIG. 8).

In operations other than such sheet winding and drawing operations, the rotation of the driven shaft 4 is locked by the frictional force of the coil spring 2. FIG. 7 is a sectional view showing such a state, and shows a case where a rotational force in the direction of arrow B is applied to the driven shaft 4 due to the weight of the seat. Due to this rotational force, the left end surface of the upper slit 4a of the driven shaft 4 comes into contact with the hook portion 2a at one end of the coil spring 2, and presses it in the same direction as the winding direction of the coil spring 2. Because of the opposite direction, the diameter of the coil portion increases, increasing the frictional force between it and the inner surface of the fixed pipe 1, and locking the rotation of the driven shaft 4. Therefore, the sheet winding shaft is held at the position where the sheet is wound. On the other hand, even when a rotational force in the opposite direction is applied to the driven shaft 4, the hook portion 2b at the other end of the coil spring 2 acts in the same manner as described above, so that the rotation of the driven shaft is locked.

At this time, the casing 10 is supported by the winding end of the sheet and stopped at an arbitrary position on the pillar 14 in a state where rotation in the direction of the winding reaction force of the sheet is prevented by the pressure contact of the rollers 6 and 7 against the pillar 14.

<Effects of the invention> According to the invention as described above, the sheet can be wound up and pulled out simply by rotating the handle, so the handle does not rotate inadvertently and is safe. Furthermore, the sheet can be wound steplessly. It is easy to operate because the handle can be taken up and pulled out, and the handle is locked by a coil spring when it is not used for winding or pulling out, so the handle does not rotate accidentally, making it safe. Since it can be removed and pulled out, fine adjustments can be made easily.

In addition, the driven shaft and the drive shaft are inserted into a fixed pipe built into the casing, and a coil spring wound with a diameter larger than the inner diameter of the fixed pipe is also inserted into the fixed pipe. is protected by a fixed pipe built into the casing, and is extremely durable even when used mainly in outdoor greenhouses and exposed to wind and rain. Since the supporting rollers are attached to press against the support rollers, the support pillars and the drive shaft are brought closer to each other, which provides a sense of stability in operation and makes the drive shaft more compact.

[Brief explanation of the drawing]

1, 2, and 3 are cross-sectional views, front views, and side views of one embodiment of the present invention, FIG. 4 is a plan view of an example of the handle, and FIG. 5 is a cross-sectional view taken along the line -- in FIG. Figures 6 and 7 are cross-sectional views showing the operation;
The figure is a perspective view of a greenhouse to which the conventional device is applied, and FIG. 9 is a sectional view of the conventional device. 1...Fixed pipe, 2...Coil spring, 2a,
2b...Hook portion, 3...Drive shaft, 4...Driver shaft, 3a, 3b, 4a, 4b...Slit, 6,
7...roller, 10...casing, 14...pillar.

Claims (1)

[Claims for Utility Model Registration] A driven shaft to which a take-up shaft for winding a sheet is connected and a drive shaft to which a handle is connected have a double pipe structure, and these driven shafts and drive shafts are connected to each other. A coil spring is attached, and when the driven shaft or drive shaft rotates, the coil spring expands and contracts to lock or release the lock, and is prevented from rotating relative to the support by rollers that press against both sides of the support. A winding device for a sheet for a greenhouse installed movably along a support via a roller, wherein the driven shaft and the driving shaft are inserted into a fixed pipe built into a casing, and the coil spring is connected to the coil spring. A roller is wound and formed to have a diameter larger than the inner diameter of the fixed pipe and inserted into the fixed pipe, and a roller located on one side of the support is attached to the outer periphery of the fixed pipe so as to be coaxial with the driven shaft and the driving shaft. A winding device for sheets for greenhouses, which is characterized by: