JP2527114Y2 - Greenhouse switchgear - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a greenhouse opening and closing device for manually opening and closing a greenhouse.

(Prior Art) There are two types of greenhouse opening / closing devices that open and close a greenhouse by rotating a sheet winding roller that forms a greenhouse to open and close the greenhouse, and those that manually rotate the winding roller. .

Among the above-mentioned opening and closing devices, there is an opening / closing device that uses an electric motor, for example, in which a worm gear is connected to one end of a winding roller and the worm is rotated by the electric motor to rotate the winding roller.

On the other hand, in a relatively small greenhouse, a greenhouse in which a take-up roller is driven to rotate manually without using an electric motor is used.

When the take-up roller is driven to rotate manually, it is necessary to provide a brake device so that the take-up roller does not drop in the rewinding direction by its own weight in normal times.

When the worm and the worm gear used in the case of the above-described electric motor are applied to a manual opening / closing device, it is not necessary to provide a brake device, but the reduction ratio of the worm and the worm gear is large, and there is no However, there is a problem that a speed-increasing device must be added.

Therefore, a greenhouse opening / closing device has been proposed in which the rotation of the take-up roller in the rewinding direction is regulated by a ratchet, and when rotational driving in the rewinding direction is desired, the ratchet is released.

Also, utilizing the deformation of the spring, when a rotational moment acts from the take-up roller side, the spring expands and is pressed against the fixed wall, a braking force acts on the take-up roller, and a rotational moment is applied from the manual handle side. When it works, there is a greenhouse switchgear having a mechanism in which a spring is compressed and a braking force is released.

(Problems to be Solved by the Invention) Among such conventional manual greenhouse opening / closing devices, those in which the take-up roller is prevented from falling by a ratchet, when the ratchet is released when the greenhouse is closed, take-up takes place. The rotational moment in the rewind direction due to the own weight of the roller acts on the operator at a stretch, and the operator may not be able to resist the rotational moment and the take-up roller may fall.

Also, in the case where the take-up roller is prevented from falling by the deformation of the spring, if an excessive external force acts on the spring, the spring is deformed and the braking force is reduced, so that a considerable safety factor is expected when selecting the spring. Therefore, there is a problem that the size of the switchgear is increased.

The present invention has been made in view of the above points, and the rotating moment in the rewinding direction due to the self-weight of the winding roller does not act on the worker at once, and the winding is surely performed even with excessive external force. It is an object of the present invention to provide a greenhouse opening / closing device capable of preventing a take-off roller from falling.

(Means for Solving the Problems) According to the present invention, in a greenhouse opening / closing device that opens and closes a greenhouse by operating a manual handle interlocking with a winding roller that winds an exterior sheet of the greenhouse, a groove is formed on one surface. A disk-like driven member connected to the winding roller on the other surface, an intermediate member having a projection meshing with the groove on one surface and having a braking portion on the other surface, and the braking portion A spring that presses the intermediate member to bring the braking portion into contact with the fixed surface, and a drive that moves the intermediate member in conjunction with the driven member and disengages the braking portion from the fixed surface. And a greenhouse opening and closing device characterized by having a member.

(Operation) In the greenhouse opening / closing device of the present invention, when the rotational moment due to the own weight of the winding roller acts on the driven member, a thrust force acts on the intermediate member meshing with the projection provided on the driven member, and the braking unit Is pressed against the fixing surface, and restricts rotation of the driven member via the intermediate member.

When operating the manual handle, the contact force between the fixed surface and the braking unit is reduced by temporarily applying a force in the winding direction, and further, the fixed surface and the braking unit are separated by the driving member, and then the driving member is used. Then, the driven member is driven to rotate, and the sheet is wound or unwound by the winding roller to open and close the greenhouse.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a part of a greenhouse in which the greenhouse opening and closing device according to the present invention is used.

Reference numeral 1 denotes a switchgear according to the present invention. The opening and closing device 1 winds and winds a winding roller 22 of a vinyl sheet 21 forming an outer wall of the greenhouse 2 along a guide bar 23,
The greenhouse 2 is opened and closed.

 Next, the structure of the opening and closing device 1 will be described.

FIG. 2 is a sectional view showing the structure of the switchgear according to the present invention.

A grip 11 is provided on an outer wall of the opening and closing device 1. Reference numeral 12 denotes a manual handle, and when the operator operates the opening / closing device 1, the user holds the grip 11 with one hand and rotates the manual handle 12 with the other hand.

A small gear 13 is fixed to the manual handle 12, and the small gear 13 is engaged with a large gear 14. Therefore, the rotational speed of the manual handle 12 is reduced, that is, the rotational force is amplified and transmitted to the large gear 14. In the present embodiment, the gear ratio is set to 1: 3.5, but is not limited to this reduction ratio.

The large gear 14 is connected to a rotating shaft 16 by a key 15 so as to be movable in the thrust direction.

Reference numeral 17 denotes a roller shaft, which is connected to one end of the take-up roller 22.

Reference numeral 18 denotes a hole through which the guide bar 23 is inserted, and 19
Is a fixed plate for holding the rotating shaft 16.

By the way, a transmission mechanism 3 for transmitting a rotational force only from the rotation shaft 16 to the roller shaft 17 is interposed between the rotation shaft 16 and the roller shaft 17.

 Next, the structure of the transmission mechanism 3 will be described.

 FIG. 3 is an exploded perspective view of the transmission mechanism 3.

A disk-shaped driving member 311 is connected to the rotating shaft 16. The drive member 311 is provided with two connection holes 312 therethrough.

An intermediate member 321 is formed in a cylindrical shape with one end face closed. The driving member 311 is rotatably and slidably inserted into the hollow portion of the intermediate member 321.
A flange-shaped braking portion 322 is provided on the opening-side end surface of the intermediate member 321.
Are provided, and a brake shoe is attached to an end surface of the braking portion 322.

An elongated hole 323 having a diameter slightly larger than the diameter of the connection hole 312 is provided at a position facing the connection hole 312 on the outer end surface on the closed side. Furthermore, four protrusions are provided on the outer end surface.
324 are provided. The projection 324 is formed by a slope inclined at a predetermined angle.

Reference numeral 331 denotes a driven member formed in a disk shape. A connecting pin 332 is fixed to one surface of the driven member, and penetrates the elongated hole 323 and is loosely fitted in the connecting hole 312. Further, a groove 333 that engages with the protrusion 324 is formed on the one surface. The roller shaft 17 is connected to the other surface of the driven member 331, and a hollow portion 334 communicating the roller shaft 17 and the driven member 331 is provided.
Is provided.

A spring 351 is provided in the hollow portion 334,
A spring pin 341 for preventing the spring 351 from falling off
Penetrate the roller shaft 17.

Therefore, the intermediate member 321 is expanded by the expansion force of the spring 351.
Will be pressed against the fixing plate 19.
However, the pressing force is very small, and the braking portion 322 is
It is set to touch 9

Next, the operation of the switching device 1 having the above configuration will be described.

4, 5 and 6 are diagrams illustrating the operation principle of the transmission mechanism 3, and FIG. 4 illustrates the rotation shaft 16 and the roller shaft 17.
5 shows a state where no rotational force is applied to both of them, FIG. 5 shows a state where a rotational force is applied from the roller drive 17 side, and FIG.
The figure shows a state when the driving force is transmitted from the rotating shaft 16 side.

As shown in FIG. 4, when no external force is applied to both the driving member 311 and the driven member 331, the intermediate member 321 is pushed toward the fixed plate 19 by the expanding force of the spring 351 and the braking part 322 is fixed to the fixed plate. In contact with 19. In addition, the driven member 331
The groove 333 and the projection 324 of the intermediate member 321 are in a state of non-contact or merely in contact.

Next, as shown in FIG. 5, when an external force acts on the driven member 331, that is, the own weight of the winding roller 22, when the external force due to the own weight is indicated by an arrow, the slope of the groove 333 and the projection 3
Contact with 24 slopes. Then, the intermediate member 321 receives the thrust force to the right in the drawing, and the braking portion 322 and the fixing plate 19
As a result, the intermediate member 321 is fixed to the fixing plate 19.

Accordingly, the driven member 331 is also restrained by the projection 324, so that the winding roller 22 does not drop.

Next, when operating the manual handle 12, a driving force is temporarily applied to the manual handle 12 in the winding direction, and the braking unit 32 is operated.
After the contact force between the rotating shaft 16 and the fixing plate 19 is reduced, the end face of the rotating shaft 16 is pushed inward of the opening / closing device 1 to release the braking portion 322 from the fixing plate 19 and release the braking force.
Winding or rewinding.

Next, an example of a method for determining the inclination angle of the slope of the projection 324 will be described.

 FIG. 7 is a partially enlarged view of the protrusion 324.

As shown in this figure, the inclination angle θ of the slope of the projection 324 is
It increases from the outer circumference to the inner circumference.

Meanwhile, when the rotational force is applied to the intermediate member 321 from the driven member 331, the conditions for the intermediate member 321 is subjected to thrust force, when the friction coefficient between the groove 333 and the projection 324 has a mu _1, tan .theta > represented by μ _1.

The condition of the sliding portion 322 is not slipped relative to the fixed plate 19, when the friction coefficient between the sliding portion 322 and the fixing plate 19 and the mu _2, is tanθ <μ _2.

Therefore, if μ ₁ <tan θ <μ ₂ and μ ₁ = 0.2 and μ ₂ = 0.5, 26.6 ° <θ <38.6 °.

In the above, the embodiments of the present invention have been described in detail, but various different embodiments can be easily configured without departing from the spirit of the present invention. Without limitation, it is not limited to any particular embodiment.

(Effects of the Invention) As described above, according to the present invention, when the rotational moment due to the own weight of the winding roller acts on the passive member, the thrust force is exerted on the intermediate member meshing with the projection provided on the driven member. Acting, the braking portion is pressed against the fixed surface and restrains the rotation of the driven member via the intermediate member, so that the take-up roller can be reliably prevented from dropping even with excessive external force.

Further, when operating the manual handle, the contact force between the fixed surface and the braking portion is reduced by temporarily applying a force in the winding direction, and after the fixed surface and the braking portion are separated by the driving member, the driving member , The driven member is driven to rotate, and the sheet is taken up or taken up by the take-up roller,
Since the greenhouse is opened and closed, the rotating moment in the rewinding direction due to the self-weight of the winding roller does not act on the operator at once.

[Brief description of the drawings]

FIG. 1 is a view showing a part of a greenhouse in which a greenhouse switchgear according to the present invention is used, FIG. 2 is a sectional view showing the structure of the switchgear according to the present invention, and FIG. , FIG. 4, FIG. 5, and FIG. 6 all show the operating principle of the transmission mechanism 3, and FIG. 7 is a partially enlarged view of the protrusion 324. 1 opening / closing device, 2 greenhouse, 3 transmission mechanism, 19
Fixing plate, 22 ... winding roller, 311 ... driving member, 321
…… Intermediate member, 322 …… Brake part, 324 …… Protrusion, 331 ……
Follower member, 333 ... groove, 351 ... spring.

Claims (2)

(57) [Scope of request for utility model registration] 1. A greenhouse opening and closing device for opening and closing a greenhouse by operating a manual handle interlocking with a winding roller for winding an exterior sheet of the greenhouse, wherein the greenhouse opening and closing device has a groove on one surface and the winding on the other surface. A disk-shaped driven member connected to a roller, an intermediate member having a projection that meshes with the groove on one surface and a braking portion on the other surface, a fixed surface facing the braking portion, and the intermediate member A greenhouse having a spring that presses the brake unit to bring the braking unit into contact with the fixed surface, and a driving member that moves the intermediate member in conjunction with the driven member and moves the braking unit away from the fixed surface. Switchgear. 2. The greenhouse opening and closing device according to claim 1, wherein the driving member is connected to a manual handle via a reduction gear.