JP7471631B2 - Connection member and greenhouse curtain opening and closing device - Google Patents

Description

The present invention relates to a connection member used in a greenhouse curtain opening/closing device that opens and closes a curtain placed at a specified height in a greenhouse to partition the upper space inside the greenhouse and provide heat retention, shading, and other effects, and to a greenhouse curtain opening/closing device that has the connection member.

Patent Document 1 discloses a greenhouse curtain opening and closing device that places a heat-retaining and light-blocking curtain made of plastic film or the like in the upper space inside a greenhouse and opens and closes it to adjust the temperature inside the greenhouse. The curtain usually has a fixed base edge and a leading member connected to the opposite edge (tip edge). A drive wire arranged along the opening and closing direction of the curtain is connected to this leading member, and the leading member is moved by running the drive wire to open and close the curtain. That is, when closing the curtain, the leading member pulls and unfolds the curtain, and when opening the curtain, the leading member is moved in the opposite direction, pushing the curtain together and opening it.

Here, the leading member has a predetermined length, and the driving wires are provided at predetermined intervals. Then, each driving wire and the leading member are connected via a connecting member. However, when opening and closing the curtain, since the leading member has a predetermined length, it does not necessarily move while maintaining a straight line due to friction, etc., and may move while curving or meandering, such as the center being slower than the edge (see Figure 6 of Patent Document 1). In such a case, if the movement of the leading member stops when any of the connecting members reaches the end point of the moving direction ahead of the other connecting members, the curtain stops midway in the movement near the connecting members that could not reach it, and the opening and closing is incomplete. For example, if the leading member does not reach the end point partially at the end point of the opening direction of the shading curtain, the shaded area in the greenhouse increases accordingly. Therefore, in Patent Document 1, a coil spring is used as a connecting member (corresponding to the "clip" in Patent Document 1) to elastically connect to the drive wire, and when there is a connecting member that has reached the end point of the moving direction ahead of the other, the leading member becomes linear, i.e., until all the connecting members reach the end point of the moving direction, the drive wire continues to run against the elastic force of the coil spring even though the preceding connecting member is stopped at the other connecting member.

JP 2001-148946 A

The connecting member (clip) shown in Patent Document 1 is not specifically shown in the document, but the two members that clamp the drive wire (corresponding to the "first gripping portion" and "second gripping portion" in Patent Document 1) are usually made of synthetic resin. Therefore, cracks and the like are easily generated due to aging. When cracks and the like occur, the force that holds the drive wire between the two members decreases rapidly. In addition, when clamping the drive wire, the nut member may be overtightened, causing damage to the first gripping portion or the second gripping portion. Therefore, when installing the connecting member, it is difficult to tighten the nut member using an electric drill, which is one of the factors that hinder the efficiency of the installation work. On the other hand, if these two members are made of metal, the weight increases, which affects the movement of the leading member and increases the manufacturing cost.

The present invention has been made in consideration of the above, and aims to provide a connection member and a greenhouse curtain opening and closing device having the connection member that can prevent cracks due to deterioration over time in the synthetic resin member that clamps the drive wire, and that can prevent a decrease in the force holding the drive wire even if cracks occur, and can also shorten the installation work.

In order to solve the above problems, the present invention provides a greenhouse curtain opening and closing device having a leading member connected to a curtain arranged in a greenhouse and a drive wire for moving the leading member, the connecting member connecting the leading member and the drive wire,
a first member having a first plate portion facing the leading member and a first wire connecting portion provided at a portion adjacent to the first plate portion in a plan view;
a second member including a second plate portion facing the first plate portion and a second wire connecting portion adjacent to the second plate portion in a plan view and sandwiching the drive wire between the second plate portion and the first wire connecting portion;
an engaging shaft member that is engageable with the leading member, that is disposed penetrating the first plate portion and the second plate portion, and that has a shaft portion having a male thread portion formed on an outer surface thereof;
a nut member that is screwed into the male thread portion of the engagement shaft member;
a coil spring disposed around the engaging shaft member between the second plate portion and the nut member,
The first member and the second member are both made of synthetic resin,
a metal plate having an outer edge that is larger than the outer periphery of the coil spring is disposed between the second plate portion and the coil spring,
The present invention provides a connecting member, characterized in that the nut member is screwed into the male threaded portion to compress the coil spring and apply a pressing force to the metal plate, the drive wire is clamped between the first wire connecting portion and the second wire connecting portion, and the drive wire slides between the first wire connecting portion and the second wire connecting portion against the pressing force of the coil spring even when the leading member stops during traveling.

It is preferable that the metal plate is large enough to cover the area where the second wire connection portion is formed.

the first member has a first adjacent portion at a position adjacent to the first plate portion in a plan view, the first adjacent portion being located below the first plate portion in a posture when the first member is attached to the leading member;
the second member has a second adjacent portion adjacent to the second plate portion in a plan view and overlapping with the first adjacent portion,
the first wire connecting portion is a groove formed in the first adjacent portion, and the second wire connecting portion is a groove formed in the second adjacent portion at a position opposite to the groove constituting the first wire connecting portion,
It is preferable that the metal plate has an approximately Z-shaped cross section, bending approximately vertically along the second adjacent portion from the portion covering the second plate portion of the second member, and further bending approximately vertically outward to cover the second adjacent portion.

It is preferable that the shaft portion of the engaging shaft member is provided with a flange portion that protrudes outward and serves as a stopper when the nut member is screwed into place.

The present invention also provides a greenhouse curtain opening and closing device that includes a leading member connected to a curtain arranged in a greenhouse and a drive wire for moving the leading member, and that moves the leading member to spread or gather the curtain in the greenhouse,
The present invention provides a greenhouse curtain opening and closing device, characterized in that the above-mentioned connecting member is used as a connecting member for connecting the leading member and the driving wire.

In the present invention, a metal plate is provided around the through hole of the engaging shaft member in the second plate portion of the second member, and has a size such that the outer edge is outside the outer circumference of the coil spring. The compression amount of the coil spring is adjusted by a nut member, and the elastic reaction force of the coil spring constantly applies a predetermined pressing force to the metal plate. Both the first member and the second member are made of synthetic resin, and are prone to cracks due to aging. In particular, the second member is located on the opposite side of the first member from the leading member, and is therefore more prone to deterioration than the first member, which is directly in the shadow of the leading member. However, according to the present invention, since the part directly pressed by the coil spring is a metal plate, even if cracks due to aging occur in the first member or the second member made of synthetic resin, the decrease in pressing force is suppressed, and the decrease in the holding force of the drive wire due to the decrease in pressing force can be suppressed.

In addition, a flange portion is formed on the shaft portion of the engaging shaft member. Therefore, even if an electric drill is used, the nut member can only be screwed in up to the point where it abuts on this flange portion, and the nut member is not over-tightened. This makes it possible to use an electric drill for work, and improves work efficiency during installation. In addition, because the second member, which is made of synthetic resin, is covered by the above-mentioned metal plate, the progression of deterioration is suppressed compared to when it is not covered by a metal plate.

FIG. 1 is a perspective view showing a schematic overall configuration of a greenhouse curtain opening/closing device according to one embodiment of the present invention. FIG. 2 is a diagram showing a schematic view of the greenhouse curtain opening/closing device according to the embodiment, showing how the curtain is opened and closed. FIG. 3 is a perspective view showing a state in which a connecting member is engaged with a leading member according to one embodiment of the present invention. FIG. 4 is a side view showing a part of the connecting member according to the embodiment. FIG. 5 is an exploded perspective view of the connection member shown in FIG. 6(a) is a plan view of the connecting member according to the above embodiment as viewed from the first member side, FIG. 6(b) is a bottom view of the first member as viewed from the underside, and FIG. 6(c) is a plan view of the second member as viewed from the top. FIG. 7 is a side view showing a connection member according to another embodiment of the present invention, with a portion cut away. FIG. 8 is an exploded perspective view of the connection member shown in FIG.

The present invention will be described in more detail below based on the embodiment shown in the drawings. FIGS. 1 to 6 are diagrams for explaining a connecting member 1 used in a greenhouse curtain opening/closing device 1000 according to one embodiment of the present invention. As shown in FIGS. 1 and 2, the greenhouse curtain opening/closing device 1000 has a leading member 100 connected to a curtain 2000 arranged in a greenhouse, a driving wire 200 for moving the leading member, and the like. The curtain 2000 is arranged on a shelf line 3000 stretched parallel to the running direction of the driving wire 200, and the lower surface is supported. The driving shaft 202 rotates when the prime mover 201 is driven, and the driving wire 200 wound around the driving shaft 202 runs in a predetermined direction. In the example of FIGS. 1 and 2, four curtains 2000 are arranged along the running direction of the driving wire 200, and the leading member 100 is attached to the leading edge 2100 of each curtain 2000. Inside the greenhouse, a plurality of crosspiece members 1100 made of pipes, steel, etc. are arranged at predetermined intervals along the direction of travel of the greenhouse drive wire 200, with their longitudinal direction aligned perpendicular to the direction of travel of the drive wire 200. Each curtain section 2000 is arranged between adjacent crosspiece members 1100, 1100 with its base edge 2200 fixed to one of the crosspiece members 1100, and is deployed or gathered between them.

The connection member 1 is provided to connect the driving wire 200 and the leading member 100. By connecting the two by the connection member 1, the leading member 100 moves, and each curtain 2000 is deployed or gathered between the adjacent rail members 1100, 1100 in the greenhouse. Here, when deploying, as shown in Figures 1 and 2, each curtain 2000 approaches the rail member 1100 located at the end of the deployment direction. At this time, it is sufficient for the leading member 100 to reach the rail member 1100 in a straight line along the longitudinal direction, but as described above, a partial delay occurs. At that time, in the connection member 1 of this embodiment, the movement of the connection member 1 and the leading member 100 at that part stops in the order of reaching the rail member 1100, while the driving wire 200 clamped by the connection member 1 does not remain in place, but continues to slide between the first wire connecting portion 12b and the second wire connecting portion 22b1 described later.

3 to 6, the connection member 1 of this embodiment is configured to include a first member 10 and a second member 20. The first member 10 and the second member 20 are arranged in a stacked manner, with the first member 10 positioned on the leading member 100 side.
The first member 10 is made of synthetic resin, is molded into a generally Z-shaped cross section, and has a first plate portion 11 and a first adjacent portion 12. The first plate portion 11 is formed in a generally flat plate shape having a predetermined width (W1) along the arrangement direction of the leading member 100, i.e., the width direction of the curtain 2000, and a predetermined depth (D1) perpendicular thereto. At a position adjacent to the first plate portion 11 in the width direction in a plan view, a generally vertical portion 12a is formed extending in a generally perpendicular direction from one end edge of the first plate portion 11 so as to protrude downward on the opposite side to the leading member 100 when attached to the leading member 100, and a generally horizontal portion 12b is formed extending outwardly in a generally perpendicular direction from the generally vertical portion 12a. The portion including the generally vertical portion 12a and the generally horizontal portion 12b constitutes the first adjacent portion 12.

A mounting bracket 110 is provided on the upper surface 11a of the first plate portion 11, which is the upper side when attached to the leading member 100, and the first plate portion 11 is attached to the leading member 100 via this mounting bracket 110.

The second member 20, like the first member 10, is made of synthetic resin and is molded to have a generally Z-shaped cross section overall, and has a second plate portion 21 and a second adjacent portion 22. The second plate portion 21 is formed in a generally flat plate shape having a predetermined width (W2) along the direction in which the leading member 100 is arranged, i.e., the width direction of the curtain, and a predetermined depth (D2) perpendicular thereto. In a plan view, at a position adjacent to the second plate portion 21 in the width direction, a generally vertical portion 22a is formed extending downward at a generally right angle from one end edge of the second plate portion 21, and a generally horizontal portion 22b is formed extending outward at a generally right angle from the generally vertical portion 22a, and the portion including the generally vertical portion 22a and the generally horizontal portion 22b constitutes the second adjacent portion 22.

The second member 20 is stacked so that the upper surface 21a of the second plate portion 21, which is the upper side when attached to the leading member 100, faces the lower surface 11b of the first plate portion 11 of the first member 10. In addition, the second member 20 is stacked so that the substantially vertical portions 12a, 22a and the substantially horizontal portions 12b, 22b of the first adjacent portion 12 of the first member 10 and the second adjacent portion 22 of the second member 10, which protrude downward, face each other (see Figures 4 and 5).

Here, as shown in Figs. 4 to 6, a groove is carved along a depth direction substantially perpendicular to the longitudinal direction of the leading member 100 at each of the opposing positions of the substantially horizontal portion 12b of the first adjacent portion 12 of the first member 10 and the substantially horizontal portion 22b of the second adjacent portion 22 of the second member 20. The groove formed in the substantially horizontal portion 12b of the first adjacent portion 12 serves as the first wire connecting portion 12b1, and the groove formed in the substantially horizontal portion 22b of the second adjacent portion 22 serves as the second wire connecting portion 22b1. The drive wire 200 is clamped between the first wire connecting portion 12b1 and the second wire connecting portion 22b1, which are made up of these grooves (see Fig. 3). In addition, each of the two substantially horizontal portions 12b, 22b has a length along the depth direction that is longer than the depth (D1, D2) of the first plate portion 11 and the second plate portion 21, and has a length that protrudes on both sides of the length of the depth (D1, D2) of the first plate portion 11 and the second plate portion 21 in a plan view, and is formed so as to increase the contact area with the drive wire 200.

The first plate portion 11 and the second plate portion 21 each have through holes 11c, 21c formed in the approximate center in a plan view. An engaging shaft member 30 is inserted into the through holes 11c, 12c. The engaging shaft member 30 has a shaft portion 31 and an engaging head portion 32 that is provided at one end of the shaft portion 31 and can engage with an engaging groove portion 100a formed along the longitudinal direction of the leading member 100. The engaging head portion 32 is formed, for example, in an approximate parallelogram shape, and is structured so that two opposing sides with a relatively narrow opposing distance are inserted into the engaging groove portion 100a along the engaging groove portion 100a and rotated approximately 90 degrees, so that two opposing sides with a wide opposing distance are engaged with the engaging groove portion 100a.

The first plate portion 11 has a hinge engaging portion 13 on the edge located on the widthwise opposite side of the first adjacent portion 12, and the second plate portion 21 has a hinge engaged portion 23 that engages with the hinge engaging portion 13 on the edge located on the widthwise opposite side of the second adjacent portion 22. When stacking the first member 10 and the second member 20, the hinge engaging portion 13 and the hinge engaged portion 23 are engaged, and the first adjacent portion 12 and the second adjacent portion 22 are rotated around the hinge engaging portion 13 so that they approach each other, so that the first wire connecting portion 12b1 and the second wire connecting portion 12b1 are stably positioned opposite each other.

The engaging shaft member 30 has a flange portion 31a formed on the shaft portion 31 near the other end 31c in the longitudinal direction thereof, which protrudes outward, and a male thread portion 31b formed from the flange portion 31a toward the other end 31c. The shaft portion 31 is disposed so as to pass through the through hole 11c of the first plate portion 11 and the through hole 21c of the second plate portion 21 from the other end 31c side. A coil spring 33 is loaded around the shaft portion 31, which protrudes downward when attached to the leading member 100 through the through hole 21c of the second plate portion 21, and a nut member 34 is screwed and fastened, which will be described in more detail below.

Here, in this embodiment, a metal plate 40 is arranged to be laminated on the lower surface 21b side of the second plate portion 21 of the second member 20. This metal plate 40 has a through hole 41a through which the engaging shaft member 30 passes, and is sized so that at least the outer edge is positioned outside the outer diameter of the coil spring 33. Therefore, as described above, the shaft portion 31 of the engaging shaft member 30, which is inserted through the through hole 11c of the first plate portion 11 and protrudes from the through hole 21c of the second plate portion 21, further protrudes downward through the through hole 41a of the metal plate 40 in this embodiment (see Figures 4 and 5).

In this embodiment, the metal plate 40 is formed with a generally Z-shaped cross section, and has a base plate portion 41, a generally vertical plate portion 42, and a generally horizontal plate portion 43 so as to cover the lower surface 21b of the second plate portion 21, the surface 22a1 of the generally vertical portion 22a, and the surface 22b2 of the generally horizontal portion 22b of the second adjacent portion 22, respectively. The through hole 41a is formed in the generally central portion of the base plate portion 41.

As described above, the first member 10 and the second member 20 are stacked by engaging the hinge engaging portion 23 with the hinge engaging portion 13, and the metal plate 40 is stacked on the lower surface 21b of the second plate portion 21 of the second member 20, and is arranged so that the through hole 41a of the base plate portion 41 communicates with the through hole 21c formed in the second plate portion 21. With the first member 10, the second member 20, and the metal plate 40 stacked in this manner, the shaft portion 31 of the engaging shaft member 30 is inserted from the through hole 11c side of the first member 10 through the through hole 21c of the second member 20 so as to protrude from the through hole 41a of the metal plate 40. At this time, the flange portion 31a of the engaging shaft member 30 is formed at a position on the outside of the through hole 41a of the metal plate 40 and spaced a predetermined distance from the through hole 41a of the metal plate 40, so that the position of the flange portion 31a of the engaging shaft member 30 is specified.

The coil spring 33 is fitted around the shaft 31 protruding from the through hole 41a of the metal plate 40, with one end positioned so that it contacts the periphery of the through hole 41a of the metal plate 40. Once the coil spring 33 is positioned in this position, the nut member 34 is screwed into the male threaded portion 31b. As the nut member 34 is tightened, the coil spring 33 is compressed, and the reaction force presses the metal plate 40 against the nut member 34 towards the second member 20.

Since the metal plate 40 is formed in a substantially Z-shape, the base plate portion 41 is pressed against the second plate portion 21, and the substantially horizontal plate portion 43, which is integrated with the base plate portion 41 via the substantially vertical plate portion 42, is pressed against the substantially horizontal portion 22b of the second adjacent portion 22. Meanwhile, the first member 10 is fixed to the leading member 100. As a result, the second adjacent portion 22 is pressed against the first adjacent portion 12, and the drive wire 200 between the second wire connecting portion 22b1 and the first wire connecting portion 12b1 is clamped from above and below with a predetermined force.

In this way, the drive wire 200 is clamped between the first wire connecting portion 12b1 and the second wire connecting portion 22b1 by the elastic reaction force of the coil spring 33 compressed by the nut member 34, but the force of the coil spring 33 acts through the metal plate 40. If the metal plate 40 were not provided, the force of the coil spring 33 would directly affect the second member 20 made of synthetic resin. Therefore, if the tightening amount of the nut member 34 is increased, the second member 20 may be damaged by the force of the coil spring 33. However, in this embodiment, since it is the metal plate 40 that directly receives the force of the coil spring 33, it can withstand a much larger force than a synthetic resin plate. Therefore, by using an electric drill to tighten the nut member 34, damage such as cracks in the second member 20 and the first member 10 is reduced even if the tightening amount is greater than expected. Conventionally, in structures that do not use a metal plate 40, it has been difficult to perform fastening work using an electric drill, but with this embodiment, it is possible to perform the work using an electric drill, increasing work efficiency.

According to this embodiment, the first member 10 is fixed to the leading member 100 by engaging the engaging head 32 of the engaging shaft member 30 with the engaging groove portion 100a of the leading member 100 via the mounting bracket 110. Next, the drive wire 200 is sandwiched between the first wire connecting portion 12b1 and the second wire connecting portion 22b1. Next, the metal plate 40 is stacked on the second member 20 as described above, the coil spring 33 is loaded around the shaft portion 31 of the engaging shaft member 30 protruding from the through hole 41a, and the nut member 34 is screwed into the male thread portion 31b. As described above, this can be easily done by using an electric drill.

As shown in FIG. 1, the driving wires 200 are provided at predetermined intervals along the longitudinal direction of the leading member 100, and the connecting member 1 of this embodiment is attached to each driving wire 200 and connected to the leading member 100. Once attached in this manner, the prime mover 201 is driven. This causes the driving shaft 202 to rotate, and the driving wire 200 wound around the driving shaft 202 runs in either direction. The leading member 100 moves along the running direction of the driving wire 200, and the curtain 2000 attached to the leading member 100 is opened and closed. At this time, the leading member 100 may move in a meandering manner due to the load applied to the curtain 2000 and the leading member 100. When the movement of the leading member 100 stops by contacting the rail member 1100, the timing of the meandering leading member 100 contacting the rail member 1100 is partially shifted, but in the connecting member 1 close to the part where it first contacted, the clamping force between the second wire connecting portion 22b1 and the first wire connecting portion 12b1 that clamp the driving wire 200 is applied by the coil spring 33, so that the driving wire 200 continues to run in the opening and closing direction of the curtain 2000 even if the movement of the leading member 100 is partially stopped. Therefore, the driving wire 200 slides between the second wire connecting portion 22b1 and the first wire connecting portion 12b1 against the elastic reaction force of the coil spring 33. Therefore, even if the leading member 100 meanders in the longitudinal direction, the leading member 100 will surely move until all parts of the curtain 2000 in the width direction reach the end point in the opening and closing direction.

According to the connection member 1 of this embodiment, the elastic reaction force of the coil spring 33 is further configured to act via the metal plate 40. If the coil spring 33 is directly abutted against the second member 20 made of synthetic resin without the metal plate 40, the force of the coil spring 33 always acts directly on the second member 20, so that the second member 20 is likely to crack due to aging, and in that case, the clamping force of the drive wire 200 by the first wire connecting portion 12b1 and the second wire connecting portion 22b1 due to the force of the coil spring 33 becomes weak. In contrast, according to this embodiment, even if cracks occur in the first member 10 or the second member 20 made of synthetic resin due to aging, the force of the coil spring 33 presses the second plate portion 21, with which the base plate portion 41 is in surface contact, toward the first plate portion 11 via the metal plate 40, so that the decrease in the clamping force of the drive wire 200 due to the force of the coil spring 33 can be suppressed. Moreover, in this embodiment, the metal plate 40 is configured to press not only the second plate portion 21, but also the substantially horizontal plate portion 43 against the substantially horizontal portion 22b of the second adjacent portion 22 where the second wire connecting portion 22b1 is formed. Therefore, the elastic reaction force of the coil spring 33 directly acts as a force that causes the substantially horizontal plate portion 43 to press the substantially horizontal portion 22b toward the substantially horizontal portion 12b of the first adjacent portion 12. Therefore, regardless of the position of the crack generated in the second member 20, etc., the clamping force of the drive wire 200 can be more reliably maintained.

In this embodiment, the metal plate 40 is substantially Z-shaped, and the base plate portion 41, the substantially vertical plate portion 42, and the substantially horizontal plate portion 43 cover the lower surface 21b of the second plate portion 21 of the second member 20, the surface 22a1 of the substantially vertical portion 22a, and the surface 22b2 of the substantially horizontal portion 22b of the second adjacent portion 22. This narrows the exposed range of the second member 20, which also contributes to suppressing deterioration over time of the second member 20 made of synthetic resin.

In the above embodiment, the flange portion 31a, which serves as the final stopper for the tightening amount of the nut member 34, is integrally provided on the engaging shaft member 30. This eliminates the need to provide a separate stopper for the tightening amount of the nut member 34, which contributes to simplifying the structure, reducing costs, and improving work efficiency. However, as shown in Figures 7 and 8, an engaging shaft member 300 without a flange portion may be used, and a cylindrical member 311 that is shorter than the shaft portion 310 protruding from the through hole 41a of the base plate portion 41 may be attached around it. When the nut member 34 is screwed onto the male thread portion 310a protruding from the cylindrical member 311, the tightening amount is regulated by contacting the edge 311a of the cylindrical member 311.

7 and 8, the metal plate 400 is made of a single flat plate member with a predetermined area. In this case, the force of the coil spring 33 acts directly on the metal plate 400 made of a single flat plate member, and therefore, when a crack or the like occurs in the second member 20 as described above, the force of the coil spring 33 acts to suppress a decrease in the clamping force. However, in the case of the metal plate 40 having a substantially Z-shaped cross section, it has the effect of directly pressing the second adjacent portion 22. Therefore, as described above, it is preferable in that the pressing force on the second member 20 (the clamping force between the first wire connecting portion 12b1 and the second wire connecting portion 22b1) can be maintained more reliably and for a longer period of time regardless of the position of the crack or the like in the second member 20.

LIST OF SYMBOLS 1 Connection member 10 First member 11 First plate portion 12 First adjacent portion 12a Approximately vertical portion 12b Approximately horizontal portion 12b1 First wire connecting portion 20 Second member 21 Second plate portion 22 Second adjacent portion 22a Approximately vertical portion 22b Approximately horizontal portion 22b1 Second wire connecting portion 30, 300 Engagement shaft member 31 Shaft portion 31a Flange portion 31b Male thread portion 32 Engagement head portion 33 Coil spring 34 Nut member 40, 400 Metal plate 41 Base plate portion 42 Approximately vertical plate portion 43 Approximately horizontal plate portion 100 Leading member 200 Drive wire 1000 Greenhouse curtain opening/closing device 1100 Crosspiece member 2000 Curtain 2100 Leading edge 2200 Base edge 3000 Shelf line

Claims (4)

A connection member for use in a greenhouse curtain opening/closing device having a leading member connected to a curtain arranged in a greenhouse and a drive wire for moving the leading member, the connection member connecting the leading member and the drive wire,
a first member having a first plate portion facing the leading member and a first wire connecting portion provided at a portion adjacent to the first plate portion in a plan view;
a second member including a second plate portion facing the first plate portion and a second wire connecting portion adjacent to the second plate portion in a plan view and sandwiching the drive wire between the second plate portion and the first wire connecting portion;
an engaging shaft member that is engageable with the leading member, that is disposed penetrating the first plate portion and the second plate portion, and that has a shaft portion having a male thread portion formed on an outer surface thereof;
a nut member that is screwed into the male thread portion of the engagement shaft member;
a coil spring disposed around the engaging shaft member between the second plate portion and the nut member,
The first member and the second member are both made of synthetic resin,
a metal plate having an outer edge located outside an outer periphery of the coil spring and a size large enough to cover a portion where the second wire connecting portion is formed is disposed between the second plate portion and the coil spring;
A connecting member characterized in that the nut member is screwed into the male threaded portion to compress the coil spring and apply a pressing force to the metal plate, the drive wire is clamped between the first wire connecting portion and the second wire connecting portion, and the drive wire slides between the first wire connecting portion and the second wire connecting portion against the pressing force of the coil spring even when the leading member stops during traveling. the first member has a first adjacent portion at a position adjacent to the first plate portion in a plan view, the first adjacent portion being located below the first plate portion in a posture when the first member is attached to the leading member;
the second member has a second adjacent portion adjacent to the second plate portion in a plan view and overlapping with the first adjacent portion,
the first wire connecting portion is a groove formed in the first adjacent portion, and the second wire connecting portion is a groove formed in the second adjacent portion at a position opposite to the groove constituting the first wire connecting portion,
2. The connecting member according to claim 1, wherein the metal plate has an approximately Z-shaped cross section, bending approximately vertically along the second adjacent portion from a portion covering the second plate portion of the second member, and further bending approximately vertically outward to cover the second adjacent portion. 3. A connecting member according to claim 1, wherein the shaft portion of the engaging shaft member is provided with a flange portion that protrudes outward and serves as a stopper when the nut member is screwed into the shaft portion. A greenhouse curtain opening and closing device having a leading member connected to a curtain arranged in a greenhouse and a drive wire for moving the leading member, the greenhouse curtain opening and closing device moving the leading member to spread or gather the curtain in the greenhouse,
A greenhouse curtain opening and closing device, comprising the connecting member according to any one of claims 1 to 3 , as a connecting member for connecting the leading member and the driving wire.