Hold for hoisting shaft of greenhouse and greenhouse

Abstract

To provide a hold for a winding shaft that has high durability and can hold the winding shaft with enhanced strength.SOLUTION: The present invention provides a hold that receives a winding shaft for opening and closing a vinyl greenhouse. The hold includes a shaft housing part and a mounting part. The mounting part is vertical. The shaft housing part includes: a curved part that bends from a lower end of the mounting part and curves outward to form a housing space whose lower side is opened; and a drooping part that droops from the curved part. The hold is made of synthetic resin, in which a metal plate is inserted into at least a bent part between the mounting part and the shaft housing part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a technology relating to agricultural greenhouses, and in particular to a technology relating to the winding up of a sheet that is used as a covering material for greenhouses and that is opened and closed to regulate the temperature. [Background technology]

[0002] Generally, in a greenhouse, a ventilation system is installed on the side of the greenhouse to adjust the temperature and humidity inside the greenhouse to ensure optimal plant growth.

[0003] As shown in Figure 1, the ventilation device for the side of a greenhouse is configured such that the lower end of a side sheet 3 stretched over the side of a greenhouse 4 is wound around a winding shaft 2, and the side sheet is rolled up from near the ground upward to form a ventilation opening 53 on the side of the greenhouse.

[0004] The winding shaft 2 rotates the winding machine 22 via a manual or electric rotary drive device attached to a guide rod 23 standing at the corner of the greenhouse so as to be freely movable up and down, and the opening 53 is opened by winding the sheet onto the winding shaft 2, and the opening 53 is closed by rewinding the sheet.

[0005] The side sheets 3 may flap when exposed to strong winds, causing the winding shaft 2 to shake significantly. For this reason, conventionally, a pressure band 62 is provided to hold down the outer surface of the side sheet to prevent flapping of the sheet and shaking of the winding shaft. However, as greenhouses have become larger in recent years, the length of the winding shaft has also increased, making it difficult to effectively prevent the sheet from flapping or the winding shaft from shaking using only the restraining force of the pressure band 62.

[0006] To improve this, several proposals have been made. Patent Document 1 (Japanese Utility Model Application Laid-Open Publication No. 63-095458) discloses a structure in which the sheet winding shaft is detachable via a hinge (see Fig. 5(c)). With this structure, a large load corresponding to a strong wind is concentrated on the hinge, which poses a risk of opening the hinge and causing the winding shaft to come off.

[0007] Furthermore, in order to fix the winding shaft 103, it is necessary to rotate the gripping piece of each holder to open the opening, accommodate the winding shaft, and then rotate the gripping piece to close it. The provision of multiple holders is cumbersome and significantly reduces operability. Patent Document 2 (Japanese Utility Model Application Laid-Open Publication No. 05-043842) proposes a winding shaft holder in which many hooks are attached to a long hook mounting shaft inserted into a support ring fixed to a vertical member of a greenhouse (see Figure 5(d)). With this holder, the sheet is first left slack, the hooks are rotated so that they fit over the winding shaft, the winding shaft is rotated to wind up the sheet, and tension is applied to the sheet so that it abuts against the hooks, which is not necessarily easy to operate. In addition, the long hook mounting shaft with many hooks attached is inserted into a support ring fixed to the vertical member of the greenhouse, and is not directly fixed to the greenhouse member but is in a floating state, so the hooks are not fixed very firmly to the greenhouse.

[0008] Patent Document 3 (JP 09-037659 A) discloses a winding shaft holding mechanism that houses a winding shaft in a downwardly open housing formed by a holder formed by bending the front piece of a wire material that is a corrugated spring whose rear piece fits into a mounting rail, and a connecting pipe that passes through an engagement hole at the tip of the holder (see Figure 5(b)).This holder has a weak fixing force, so the film is held down using a film holding string that is freely attached to the periphery of the greenhouse and can be tightened. Patent Document 4 (Japanese Patent No. 5798464) proposes a greenhouse sheet flutter prevention device that consists of a mounting part with an open bottom that is attached to a ridge-side member of the greenhouse with a fastener and a sheet winding shaft housing part that extends from one open edge of the mounting part, in which the sheet winding shaft housing part guides the sheet winding shaft, which is being unwound along its outer surface, downward and toward the outside of the room, and the tension of the rewound sheet holds the sheet winding shaft against its inner surface. This sheet flutter prevention device has a structure in which the mounting part is bent in a U-shape and hooked onto a rod-shaped fixing material from above, with the rear surface fastened with a fastener, and the outward-curved winding shaft housing part is bent to the same thickness as the mounting part (see Figure 5(a)).

[0009] The applicant has realized large cultivation greenhouses by devising the skeletal pipe materials and the structure inside the greenhouse. For example, Patent Document 5 (Patent Publication No. 6247046) proposes octagonal arch materials and pillar materials, and Patent Document 6 (Patent Publication No. 6621588) proposes the arrangement of cross tie bars. As greenhouses have become larger in recent years, they are more susceptible to strong winds, increasing the risk of deformation and collapse. Although the skeletal structure of greenhouses has been strengthened, it has been found that when wind enters the greenhouse, the internal pressure increases, causing the sheets to flip up and leading to damage to the greenhouse. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Utility Model Application Publication No. 63-095458 [Patent Document 2] Japanese Utility Model Application Publication No. 05-043842 [Patent Document 3] Japanese Patent Application Publication No. 09-037659 [Patent Document 4] Patent No. 5798464 [Patent Document 5] Patent No. 6247046 [Patent Document 6] Patent No. 6621588 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made with the aim of solving these problems, and has as its object the development of a winding shaft hold that has improved holding power and high durability. [Means for solving the problem]

[0012] The present invention strengthens the fixation of the hoisting shaft against wind pressure as greenhouses become larger. 1. A hold for receiving a winding shaft for opening and closing a greenhouse, which has a shaft receiving section and an attachment section, The mounting portion is vertical, and the shaft accommodating portion has a curved portion that is bent from the lower end of the mounting portion and curved outward to form an accommodating space that is open downward, and a hanging portion that hangs down from the curved portion, A hold characterized by being made of synthetic resin with a metal plate inserted at least in the bent portion between the mounting portion and the shaft accommodating portion. 2. A hold according to item 1, characterized in that the hanging portion of the shaft accommodating portion is made of a soft material, and the resin of other portions is made of a hard material. 3. A hold as described in 1. or 2., characterized in that a guide taper is formed on the inside of the tip of the hanging portion. 4. In a greenhouse in which the winding shaft rolls up the side sheet on the side of the greenhouse to open the opening, A greenhouse characterized in that the hold described in 1. or 2. is attached to a pillar or cross member on the side closer to the hoisting machine, at a height slightly above the lower end of the hoisting shaft. 5. A greenhouse according to 4., characterized in that at least the pillars or cross members of the arch members to which the holds are attached are pipes with an octagonal cross section. 6. A greenhouse according to claim 5, further characterized in that holds are attached to the pillars or cross members in the middle and on the opposite gable side. [Effects of the Invention]

[0013] 1. The hold for fixing the winding shaft of the present invention has improved holding power for the winding shaft, realizing a highly durable hold for the winding shaft. A metal plate is inserted into the bent part between the mounting part and the shaft housing part, so the elasticity and flexibility of the metal plate are added to the resin hold, making it possible to cope with stress concentrated in the bent part. As greenhouses become larger, the winding shaft is subjected to greater impacts, but resin holds have problems with impact resistance, and bent metal plates are prone to deformation due to the impact, making them incompatible. In this invention, we have developed a hold that can adequately accommodate even larger greenhouses. Placing a metal plate up to the screw hole position improves the durability of the screw hole and makes it possible to secure the screw firmly. If the area around the screw hole is only made of resin, the stress on the hold that holds down the winding shaft will be concentrated on the screw hole, which can cause cracks in the resin, but the metal plate reinforces it. It is desirable that the metal plate be placed up to the upper part of the curved section in the shaft housing. Even if the winding shaft housed in the shaft housing is swayed by wind or other factors, the metal plate can flex to hold it down and stabilize it in accordance with the swinging motion in the shaft housing. Furthermore, while metal components alone would suffer from metal fatigue and deformation, this hold combines resin and metal, allowing for the elasticity of metal and the rigidity of resin to be utilized. 2. By forming the hanging part of the shaft housing from a soft material (elastic material, elastomer), even if the housed winding shaft is swayed by the wind, it is possible to absorb the impact and suppress the movement of the winding shaft. As a result, the winding shaft is prevented from jumping out of place. Also, as wind pressure increases, the winding shaft may vibrate and the amplitude may increase due to resonance, but by having the winding shaft come into contact with the soft material, the initial vibration can be suppressed, improving the stability of the winding shaft. 3. Forming a guide taper on the inside of the tip of the hanging part makes it easier to pull the winding shaft into the shaft housing. Once the winding shaft is lowered below the hold, it moves closer to the greenhouse, making it easier to guide it along the tapered tip of the hold. 4. In greenhouses equipped with the holds of the present invention, the stability of the hoisting shaft is improved, and damage to large greenhouses caused by wind is reduced. 5. By using the octagonal cross-section pipe material for greenhouses developed by the applicant, the hold of the present invention can be fixed to the pipe material with surface contact. In addition, since multiple screws can be driven in from the top and bottom or left and right, the degree of fixation is improved, making it suitable for large greenhouses. The holds can be firmly fixed with screws up to a position below the pillar material, and the holds can be attached below the sheet fixing members that fix the horizontally installed bottom sheet, so the side sheets can be lowered all the way down to increase the width of the overlap with the bottom sheet, improving the effect of preventing wind from blowing in. 6. By installing this hold in the middle of the greenhouse or on the gable side opposite the hoist, the number of points to hold down the winding shaft increases, improving the stability of the winding shaft and making it possible to accommodate larger greenhouses. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic perspective view of an embodiment in which the hoisting hold of the present invention is applied to a greenhouse. [Figure 2] Figure 2 shows a view of the hoisting hold of the present invention, (a) a perspective view and (b) a cross-sectional view. [Figure 3] Figure 3 shows how the hoisting holds are attached. (a) Shows an example where they are attached to a pillar, and (b) shows an example where they are attached to a cross member. [Figure 4] Figure 4 shows the process of fixing the winding shaft to the hold: (a) a diagram showing the winding-down operation of the winding shaft, (b) a diagram showing the state in which the winding shaft is wound up in the reverse direction from the lowest end, (c) a diagram showing the process in which the winding shaft is wound up in the reverse direction from the lowest end and stored in the hold, and (d) a diagram showing a cross section of the greenhouse. [Figure 5] FIG. 5 is a diagram showing a conventional example. [Figure 6]Figure 6 shows octagonal timber suitable for large greenhouses and its structural diagram. (a) shows an example of an octagonal pipe proposed by the applicant in Patent Document 5, and (b) shows an example of a large greenhouse proposed by the applicant in Patent Document 6. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention strengthens the fixation of the winding shaft against wind pressure as greenhouses become larger. Many greenhouses are designed to control temperature by opening and closing side sheets. The side sheets are opened and closed by winding the side sheets around the winding shaft while moving the shaft up and down. Because the winding shaft is installed in the longitudinal direction of the side, it becomes longer as greenhouses become larger. The present invention provides a hold that can stably fix the winding shaft of these larger greenhouses, and a greenhouse equipped with this hold.

[0016] The hold of the winding shaft of the present invention will be described with reference to FIGS. 1 to 4 showing one embodiment of the present invention. Figure 2 shows the hold 1. (a) is a perspective view, and (b) is a cross-sectional view. The hold 1 is formed of a plate body having a shaft receiving portion 11 and a mounting portion 12 . The mounting portion 12 is a flat plate that is bent and rises from one end of the shaft storage portion 11. The mounting portion 12 is the portion that attaches the hold 1 to the pillars or cross members of the greenhouse. The mounting portion 12 has a screw groove 12a formed in the horizontal direction for driving a screw. The screw groove 12a serves as a guide when driving the screw. There can be more than one screw groove 12a.

[0017] One side of shaft accommodating portion 11 juts outward to form accommodating space 13 that is open downward, and has arc-shaped curved portion 14 and hanging portion 15 below curved portion 14. Lower edge 16 of hanging portion 15 can be provided with a guide taper 16a on the inside. The base material of the hold is synthetic resin, and the same resin material can be used for the entire hold, but the hanging portion can also be made of a resilient soft resin (such as an elastomer).

[0018] A thin metal plate 19 is inserted across the front and rear of the bent portion 17a, which is the connection between the shaft receiving portion 11 and the mounting portion 12. The metal plate 19 is placed near the bent portion 17a, but it is preferable that it be placed up to the point where the screws are driven in the mounting portion 12. On the shaft receiving portion 11 side, the metal plate 19 is placed on the inclined portion 17 extended from the bent portion 17a, and it can be placed up to just before the curved portion 14.

[0019] The hold 1 is made entirely of synthetic resin, with metal plates inserted before and after the bent portion. The resin material is a hard resin, such as ABS resin or its modified AES resin. When a soft resin is used for the hanging portion, an olefin-based or styrene-based elastomer material is used.

[0020] The metal plate can be made of an iron-based material such as stainless steel (SUS430, etc.). There is no limit to the thickness of the metal plate, so long as it can be inserted, and foil, sheet, thin plate, etc. can be used.

[0021] In terms of size, the shaft storage section should be large enough to store the winding shaft, and the mounting section should be large enough to mount it on a pillar or the like. The width W should be at least 10 cm, preferably about 20 to 40 cm, so that the winding shaft can be held down across the surface. It can be made longer, but as the sheet is raised and lowered, the winding shaft may become bent and difficult to accommodate, reducing ease of use and work efficiency. For example, the height of the mounting portion is about 10 to 60 mm, or may be about 30 mm. The amount of overhang of the shaft housing portion 11 is a length that can house the winding shaft. The overhang is set according to the thickness of the winding shaft, but is often around 40 mm. The distance from the bent portion to the tip of the hanging portion is about 50 mm, and this is also preferably set larger than the diameter according to the thickness of the winding shaft. The thickness can be formed to about 2 to 7 mm. The resin molding can be performed by known means such as injection molding or extrusion molding, and the metal plate can be inserted by known means.

[0022] The hold of the present invention has metal inserted into the resin, combining the rigidity of the resin with the flexibility of the metal to give the hold durability and a high holding force on the winding shaft. By inserting a metal plate into the bent section, the stress concentrated in the bent section is absorbed by the flexibility of the metal, preventing damage to the resin. Holds made by bending thin metal plates are at risk of deformation or damage due to metal fatigue due to the impact caused by the swinging of the housed winding shaft, but the rigidity of the resin prevents deformation. If the metal plate insert is extended up to the screw position of the mounting part, the resistance to stress concentrated in the screw hole will be improved. Also, if the metal plate is inserted up to the top of the curved part of the shaft receiving part, the shaft receiving part will be reinforced. As greenhouses become larger, the wind shaft is subjected to greater impacts from wind, but the hold of the present invention can generate a stable holding force.

[0023] Furthermore, by forming the hanging part of the shaft housing part from a soft material, even if the housed winding shaft is shaken by the wind, the shock can be absorbed and the movement of the winding shaft can be suppressed. As a result, the winding shaft is prevented from jumping out from below. Also, as wind pressure increases, the winding shaft may vibrate and the amplitude may increase due to resonance, but by having the winding shaft come into contact with the soft material, the initial vibration can be suppressed, improving the stability of the winding shaft. Furthermore, by forming a guide taper on the inside of the tip of the hanging section, it becomes easier to pull the winding shaft into the shaft housing section. Once the winding shaft is lowered below the hold, it moves toward the greenhouse, making it easier to guide it by the tapered tip of the hold. When the winding shaft does not fit into the hold, an operator must guide it into the shaft housing section, but this invention can reduce this kind of work. In particular, as greenhouses become larger and the winding shaft becomes longer, it is more likely to develop a curling tendency, making it more difficult for the winding shaft to fit into the hold, so guiding by the tapered section becomes more useful. A greenhouse equipped with the hold of the present invention has improved stability in holding the winding shaft, which can prevent damage to large greenhouses caused by wind.

[0024] By using octagonal cross-section pipes for greenhouses developed by the applicant, the holds of the present invention can be fixed to the pipes with surface contact. The holds can be attached to pillars and cross members. With pillars using octagonal pipes, there is no limit to the height at which the holds can be attached, and installing the holds at a height that increases the width of the overlap with the bottom sheet increases the effectiveness of preventing wind from blowing in. Furthermore, since multiple screws can be driven in either up and down or left and right, the degree of fixation can be improved, making it possible to build larger greenhouses. Screws can be driven in either left and right or up and down, and when three or more screws are driven in parallel, they have better resistance to twisting and bending than when two screws are used. By providing this hold in the middle of the greenhouse or on the gable side opposite the hoist, the number of places to hold down the winding shaft increases, improving the stability of the winding shaft and making it suitable for large greenhouses.

[0025] FIG. 1 shows an example in which the hoisting hold of the present invention is applied to a greenhouse. Greenhouse 4 is a typical example of a single-building greenhouse. A large number of arch members 41, each consisting of a pillar 43 and a roof arch 42, are lined up in the ridge direction, and girders (horizontal members) such as ridge members are provided in the ridge direction to connect the arch members, with end sections 51 formed at the front and back to form a framework. Sheets are stretched over the surface of this framework to form a greenhouse. The sheets include a roof sheet 33, side sheets 3, bottom sheets 32, and side sheets 31. These sheets are fixed in grooves in sheet fixing materials 61 with spring materials, for example. The side sheets 3 are fixed at the top edge and wound around the winding shaft 2 at the bottom edge so that they can be opened and closed. The winding shaft 2 is rotated by a hoist 22 provided on the end side. The hoist 22 is guided by a vertical guide rod 23, rising as the sheet is wound and falling as the sheet is unwound. A guide rod may also be provided on the opposite end side as needed. Presser bands 62 are hung on band hooks 63 at the top and bottom of the sides of the greenhouse 4 and stretched in a zigzag pattern. The side sheet 3 moves up and down between the presser bands 62 and the pillars 43. When the side sheet 3 is unwound, the presser bands 62 hold down the side sheet 3, so under normal conditions, wind does not get into the greenhouse. The band hooks 63 are attached to the purlin material 45 at the top and to the sheet fixing material 61 that holds down the bottom sheet.

[0026] In this example, the hold 1 is attached to the pillar 43 or cross member so that it can hold down the winding shaft 2 when it is unwound. Multiple attachment points can be provided along the length of the ridge. Since it is particularly important to stabilize the end side, the hold 1 is attached to a point close to the guide rod 23 (close to the end). Hold 1 protrudes from the side of the house, so if you lower the winding shaft below Hold 1 and then wind it up a little, the winding shaft will fit into the storage space formed by the shaft storage section of the hold. However, if the winding shaft is long and the sheet is wound unevenly, the winding shaft may become distorted. However, the holds of the present invention are not continuous but are arranged at intervals, so that each part can push the winding shaft into the curved space.

[0027] The gable portion 51 has a gable sheet 34 stretched over the gable portion's framework, and an opening / closing door 52 is installed in the center to provide an entrance / exit 5 to the greenhouse.

[0028] Figure 3 shows the installation state of the hoisting hold. 1(a) is an example in which the hold 1 is attached to a pillar 43 with mounting screws 64. The pillar 43 is made of an octagonal pipe material (see Patent Documents 5 and 6). The octagonal pipe material is surface-joined with the plate-shaped mounting part 12, resulting in a stable mounting state. When attached to the pillar 43, there is a high degree of freedom in the mounting height. If the hold is attached below the top edge of the bottom sheet, the bottom end position of the winding shaft (approximately the height of the hold) will be lower than the top edge of the bottom sheet, and the overlap between the side sheet and the bottom sheet when lowered will increase, improving the ability to prevent wind from entering the greenhouse. (b) is an example of hold 1 being attached to a cross member with screws 64. As with the pillars, octagonal pipes are used for the cross members. The cross members are arranged horizontally, allowing the hold to be attached freely in the longitudinal direction of the greenhouse. In addition, the screws can be driven in at a distance to the side, improving the stability of the hold.

[0029] Figure 4 shows the process of fixing the hoisting shaft to the hold. In Figure 4(a), when the handle of the hoist 22 is turned, the hoist 22 rises along the guide rod 23, the hoist shaft 2 winds up the side sheet, and an opening 53 is formed in the side of the greenhouse, allowing ventilation to prevent the temperature inside from rising excessively. The outer surface of the hoist shaft 2 is held down by a pressure band 62. From this state, the hoist shaft 2 is rewound to close the opening 53. Figure 4(b) shows the operation of winding up the winding shaft 2 a little from a state where it has been unwound below the hold 1, and then storing the hold 1. When the winding shaft 2 is unwound, the winding state of the side sheet is close to its original state, so the winding tendency is easily corrected. However, if there is distortion on the winding shaft in the unwound state, correcting the winding tendency of the sheet will make it easier to store it in the hold and open and close the side sheet. Note that if the winding shaft cannot be stored in the hold by operating the hoist 22, the winding shaft can be stored in the hold by hand. Figure 4(c) is an enlarged view of the operation of securing the winding shaft to the hold, as shown in Figure 4(b). When the winding shaft 2 is rewound below the hold 1, it descends along the outer surface of the pillar 43, climbing over the shaft housing 11 of the hold that protrudes from the pillar, and abuts against the surface of the pillar (left). After abutting against the surface of the pillar, it is further rotated downward. This brings it to the lower limit of the side sheet 3 secured to the winding shaft 2. Further winding in the same direction results in a reverse winding, and the winding shaft 2 is wound up. By continuing to rotate the hoist 22, the winding shaft is wound up and placed in the housing space (right). By rotating the hoist 22 in the opposite direction, the winding shaft 2 rises upward while wrapping around the side sheet 3, creating an opening 53. In particular, if a guide taper is provided at the tip of the hold, the winding shaft can be smoothly guided into the accommodation space. Figure 4(d) shows the states (a) to (c) as a cross-section. The winding shaft 2 is at the winding shaft lower position 2a at the hold 1, and at the winding shaft upper position 2b near the upper sheet fixing member 61a where the upper band hook is attached. The space between these positions is the opening height 53h where the side sheet 3 moves up and down, forming the opening 53. The sheet fixing members 61a, 61b, and 61c fix sheet materials such as the roof sheet, side sheet, and bottom sheet at their respective positions.

[0030] The use of the holds of the present invention can be summarized as follows. As shown in Figure 4(a), the shaft storage section 11 of this hold rotates the hoist 22 to unwind the side sheet 3 wound around the winding shaft 2 along the side pillar of the greenhouse. The clockwise rotation of the winding shaft 2 continues to completely unwind the side sheet 3, and when the winding shaft 2 continues to rotate, the side sheet is wound up around the winding shaft 2 in the opposite direction, and the state shown in Figure 4(b) is reached, where the tension of the side sheet 3 holds the winding shaft 2 in the curved storage space 13 inside the shaft storage section 11. By rotating the winding shaft 2 in this way, the winding shaft 2 is automatically held within the shaft housing portion 11, so that it can be fixed to the greenhouse in a short time with a simple operation. When the winding shaft 2 is accommodated in the shaft accommodating portion 11, the opening 53 is completely closed by the tensioned side sheet 3. The winding shaft 2 is maintained at its height by the reverse rotation prevention mechanism and lock within the rotary drive device, as described above, and is prevented from moving downward. The provision of this hold also ensures that the winding shaft remains stably fixed even in strong winds, preventing wind from entering the greenhouse and causing the vinyl to collapse from the inside due to wind pressure. Furthermore, the winding shaft 2 is further stabilized by bands stretched via band hooks provided at predetermined intervals near the bottom end of the bottom sheet 32 ​​and on the ridge-direction member at the bottom end of the roof sheet 33. [Explanation of symbols]

[0031] 1 Hold 11 Shaft housing 12 Mounting part 12a screw groove 13 Containment Space 14 Curved section 15 Hanging part 16 Lower edge 16a Guide taper 17 Slope 17a Bend part 19 Metal plate 2 Winding shaft 22 Hoisting machine 23 Guide rod 3 Side sheets 31 Side seat 32 Bottom sheet 33 Roofing Sheet 34 Wife seat 4. Greenhouses 41 Arch member 42 Roof Arch 43 Pillar part 45 Purlin 5 Entrance / exit 51 Wife 52 Opening and closing doors 53 Opening 53h opening height 61 Sheet fixing material 62 Retaining band 63 Band Hook 64 Mounting screws

Claims

1. A hold for receiving a winding shaft for opening and closing a greenhouse, the hold having a shaft receiving portion and a mounting portion, The mounting portion is vertical, and the shaft accommodating portion has a curved portion that is bent from the lower end of the mounting portion and curved outward to form an accommodating space that is open downward, and a hanging portion that hangs down from the curved portion, A hold characterized by being made of synthetic resin with a metal plate inserted at least in the bent portion between the mounting portion and the shaft accommodating portion.

2. 2. The hold according to claim 1, wherein the hanging portion of the shaft accommodating portion is made of a soft material, and the resin of the other portion is made of a hard material.

3. 3. The hold according to claim 1, wherein a guide taper is formed on the inside of the tip of the hanging portion.

4. In a greenhouse in which a winding shaft rolls up a side sheet on the side of the greenhouse to open the opening, A greenhouse characterized in that the hold described in claim 1 or 2 is attached to a pillar or cross member on the side closer to the hoist, at a height slightly above the lower end position of the hoisting shaft.

5. 5. The greenhouse according to claim 4, wherein at least the pillars or cross members of the arch members to which the holds are attached are pipes having an octagonal cross section.

6. 6. The greenhouse according to claim 5, further comprising holds attached to the pillars or cross members at the middle portion and the opposite gable side.

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