Screen device

Abstract

To provide a screen device in which the tension of a screen can be adjusted.SOLUTION: A screen device 1 has a screen take-up mechanisms 10A, 10B that tension and wind screens 3A, 3B. The take-up mechanisms have take-up rollers 4A, 4B that wind the screens, take-up drums 40A, 40B coaxially installed with the take-up rollers, drum shafts 29A,29B rotatable relative to the take-up rollers, wires 30A, 30B connected to the take-up drums and the screens, and coil springs 34A, 34B connected to the take-up rollers and the drum shafts. The take-up drums and the drum shafts are switchable between an engaged position in which they are engaged around an axis and a disengaged position in which they are disengaged and capable of relative rotation around an axis. After rotating the drum shaft with the take-up drums and the drum shafts in a disengaged position, the tension of the screen can be adjusted by switching the take-up drums and the drum shafts to the engaged position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a screen device that is attached to an opening in a building and used for purposes such as shading, privacy, or insect control. [Background technology]

[0002] Various types of screen devices have been known for attachment to building openings to provide light blocking, privacy, insect protection, etc. Patent Document 1 discloses a curtain opening / closing device as an example of such a screen device. This curtain opening / closing device opens and closes the building opening by raising and lowering a curtain, and tension is always applied to the curtain.

[0003] The curtain opening and closing device described in Patent Document 1 applies tension to the screen (curtain), and therefore winds up the screen. Volume The winding roller (winding shaft) and the drum shaft (shaft) are arranged coaxially, the winding drum (winding pulley) is attached to one end of the drum shaft in the axial direction, the base end is wound around the winding drum and the tip end is connected to the upper end of the screen, and the wire (guide rope) is connected to the winding roller and the drum shaft at both ends, and the twisting force accumulated by twisting is transmitted to the winding roller and the drum shaft. In contrast, The screen is configured to have a coil spring that transmits torque in the winding direction of the screen and the wire. As a result, the base end of the screen is pulled downward via the winding roller and the tip end of the screen is pulled upward via the wire due to the torsional force of the coil spring, so that the screen is always in a state of tension.

[0004] However, at the site where the screen is installed, there is a demand to be able to increase or decrease the tension applied to the screen depending on the environment of the site. Both Since the ends are connected to the winding roller and drum shaft, and the winding drum is fixed to the drum shaft, the tension of the screen cannot be adjusted. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-170477 Summary of the Invention [Problem to be solved by the invention]

[0006] The technical object of the present invention is to provide a screen device that can open and close a building opening while constantly applying tension to the screen, and that can appropriately adjust the tension of the screen. [Means for solving the problem]

[0007] In order to solve the above problem, the screen device of the present invention comprises a screen for opening and closing a building opening, and a screen winding mechanism for winding and unwinding the screen while applying tension to the screen, and the screen winding mechanism is configured to wind the screen around the building opening. Around the axis The screen winding device includes a winding roller that is rotatably supported and is connected to an end of the winding side of the screen to wind up the screen, a winding drum that is disposed coaxially with the winding roller, a drum shaft that is disposed coaxially with the winding roller and the winding drum, is supported so as to be rotatable relative to the winding roller, and has the winding drum attached thereto, a wire that is connected at one end to the winding drum and at the other end to an end of the unwinding side of the screen, and a coil spring that is connected at one end to the winding roller and at the other end to the drum shaft, and applies a torsional force of the coil spring to the winding roller and the winding drum. In contrast, As a rotational force in the direction of winding the screen and the wire, By acting, A screen device that applies tension to the screen, wherein the winding drum and the drum shaft are both Axis circumference Engaged state and This provides tension to the screen. The engagement position and the disengagement state of the two are released. Axial circumferencea non-engagement position in which the take-up drum and the drum shaft are relatively rotatable relative to each other, and when the take-up drum and the drum shaft are switched to the non-engagement position, The tension applied to the screen can be adjusted by rotating the drum shaft around the axis to change the torsional force of the coil spring. It is characterized in that it is possible.

[0008] In this case, preferably, the winding drum further has the above-mentioned axis line The screen winding mechanism is attached so as to be movable along the direction of the drum shaft, and the screen winding mechanism has an engagement portion fixed to the drum shaft and a winding drum. and can be engaged with and disengaged from the engaging portion as it moves in the axial direction. and an engaged portion, and the winding drum and the drum shaft are In the axial direction, The winding drum In a direction approaching the engaging portion When the engaging portion is engaged with the engaged portion by moving the engaging portion, the engaging portion is switched to the engaging position, and the winding drum In front When the engaging portion is moved in a direction away from the engaging portion to release the engagement between the engaged portion and the engaging portion, the engaging portion is switched to the non-engaged position.

[0009] Preferably, the engaging portion has an engaging base disposed around the drum shaft, and a plurality of either convex portions or concave portions formed at equal intervals around the drum shaft on an end surface of the engaging base facing the winding drum, and the engaged portion has a plurality of either convex portions or concave portions that are engageable with either one of the convex portions or the concave portions formed at equal intervals around the drum shaft on a surface of the winding drum facing the engaging portion, and the other of the either convex portions or the concave portions, and the screen winding mechanism is In the disengaged position: The drum shaft Axial circumference At a specified angle After rotating it, by switching it to the engagement position, The torsional force of the coil spring can be changed in stages.

[0010] Preferably, the take-up drum has a fitting recess in which the engaging base is insertably and removably fitted on an end surface of the drum facing the engaging portion, A front end of the fitting recess is provided on a bottom surface of the fitting recess facing the engaging portion. The recess or the protrusion is formed so as to be engageable with the protrusion or the recess of the engagement portion.

[0011] Also, preferably, the engaging portion is In the engagement position, the engaging member is disposed at a position spaced apart from the end surface of the drum.The drum has an operating portion that protrudes radially outward from the end surface of the drum.

[0012] Preferably, the drum shaft is provided with an elastic member that biases the take-up drum toward the engaging portion, In the engaged position, The engaging portion is fastened to the engaged portion by the elastic member. against It is being pressed.

[0013] Preferably, the winding drum is formed in a truncated cone shape and has a large diameter portion that serves as a winding start end when winding the wire and a small diameter portion that serves as a winding end end when winding the wire, and a fitting groove into which the wound wire fits is formed on the outer periphery of the winding drum so as to spirally connect the large diameter portion and the small diameter portion.More preferably, the diameter of the portion of the large diameter portion of the winding drum that serves as the winding start end is equal to the winding diameter of the screen when the winding roller has wound the screen and fully opened, and the diameter of the portion of the small diameter portion of the winding drum that serves as the winding end end is equal to the diameter of the winding roller. [Effects of the Invention]

[0014] The screen device of the present invention is a screen device that can open and close a building opening while constantly applying tension to the screen, and can provide a screen device that can adjust the tension of the screen as needed. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a front view of the screen device according to the present invention when the screen is being unwound. [Figure 2] FIG. 2 is a plan view of the screen device of FIG. [Figure 3] FIG. 3(a) is a bottom view of the winding drum, and FIG. 3(b) is a perspective view of the winding drum as seen from the bottom side. [Figure 4] FIG. 4(a) is a plan view of the engaged portion, and FIG. 4(b) is a perspective view of the engaged portion as seen from above. [Figure 5] 10 is a partial cross-sectional view of the screen device for explaining an engaged state of an engaging portion and a non-engaging portion of the screen winding mechanism. FIG. [Figure 6] 10 is a partial cross-sectional view of the screen device for explaining a disengaged state of an engaging portion and a disengaging portion of the screen winding mechanism. FIG. [Figure 7] FIG. 7(a) is a cross-sectional view of the winding drum and the drum shaft in the engaged position, and FIG. 7(b) is a cross-sectional view of the winding drum and the drum shaft in the disengaged position. [Figure 8] FIG. 10 is a schematic plan view of the screen device when the screen is fully opened, in which the winding roller and the winding drum are separated and the number of turns of the coil spring is reduced. [Figure 9] FIG. 2 is a schematic diagram of the screen device when the screen is half-opened. [Figure 10] FIG. 2 is a schematic diagram of the screen device when the screen is fully closed. DETAILED DESCRIPTION OF THE INVENTION

[0016] 1 to 7 show one embodiment of a screen device according to the present invention. As shown in Fig. 1, this screen device 1 is a horizontal-opening type that moves screens 3A and 3B horizontally to open and close a building opening 70. Note that the screen device 1 is not limited to the horizontal-opening type, and may be a vertical-opening type that raises and lowers screens 3A and 3B to open and close the building opening 70.

[0017] The screen device 1 is equipped with a screen frame 5 consisting of a pair of vertical frame rods 9, 9 connected to both ends of an upper horizontal frame rod 7 and a lower horizontal frame rod 8 installed in a building opening 70. In this embodiment, the pair of vertical frame rods 9, 9 each serve as winding boxes 6A, 6B for screens 3A, 3B, and winding rollers 4A, 4B for screens 3A, 3B are rotatably housed in the winding boxes 6A, 6B, respectively. One end of each of the screens 3A, 3B is fixed to the winding rollers 4A, 4B, and movable crosspieces 14A, 14B are attached to the other end of each of the screens 3A, 3B. These movable crosspieces 14A, 14B open and close the screens 3A, 3B independently and individually, and the screens 3A, 3B are closed by bringing the movable crosspieces 14A, 14B into contact with each other at the center of the building opening 70 in the left-right direction (width direction). This constitutes a side-opening screen device 1.

[0018] That is, the screen frame 5 is composed of winding boxes 6A, 6B arranged vertically on both the left and right sides of the building opening 70, and upper horizontal frame rods 7 and lower horizontal frame rods 8 that extend horizontally from the upper and lower ends of these winding boxes 6A, 6B along the upper and lower edges of the building opening 70, respectively.

[0019] In the screen unit 1 of this embodiment, the basic structure for opening and closing the left and right screens 3A and 3B is symmetrical with respect to the center of the screen unit 1 in the left-right direction, so in the following explanation, unless particularly necessary, the mechanism related to the screen 3A on the right side in Figure 1 will be explained, and the explanation of the mechanism related to the screen 3B on the left side will be omitted, with the auxiliary symbols "A" and "a" being read as "B" and "b" as appropriate.

[0020] Furthermore, in this embodiment, winding up the screens 3A and 3B on the winding rollers 4A and 4B to open the building opening 70 is referred to as "opening the screens 3A and 3B," and unwinding the screens 3A and 3B from the winding rollers 4A and 4B to close the building opening 70 is referred to as "closing the screens 3A and 3B." Therefore, "opening and closing the screens 3A and 3B" means "opening and closing the building opening 70 with the screens 3A and 3B."

[0021] The screen device 1 includes screens 3A, 3B for opening and closing a building opening 70, and screen winding mechanisms 10A, 10B for winding and unwinding the screen while tension is applied to the screen.

[0022] The screen winding mechanisms 10A and 10B are connected to movable bars 14A and 14B attached to the leading ends of the screens 3A and 3B in the unwinding direction, and to the building opening 70. Around the axis winding rollers 4A, 4B that are rotatably supported and to which base ends of the screens 3A, 3B are connected for winding and unwinding the screens 3A, 3B; winding drums 40A, 40B that are disposed coaxially with the winding rollers 4A, 4B; and winding drums 40A, 40B that are disposed coaxially with the winding rollers 4A, 4B and the winding drums 40A, 40B and are supported so as to be rotatable relative to the winding rollers 4A, 4B. Volume The winding rollers 4A, 4B are wound around the drum shafts 29A, 29B, and the winding drums 40A, 40B are attached to the wires 30A, 30B. The wires 30A, 30B have one end connected to the winding drums 40A, 40B and the other end connected to the movable bars 14A, 14B. The winding rollers 4A, 4B are wound around the drum shafts 29A, 29B. The twisting force of the coil springs 34A, 34B is transmitted to the winding rollers 4A, 4B and the winding drums 40A, 40B. In contrast, As a rotational force in the direction of winding the screens 3A, 3B and the wires 30A, 30B, By acting The screens 3A and 3B are configured to be tensioned.

[0023] In this embodiment, the winding rollers 4A, 4B are disposed at both widthwise ends of the building opening 70, are cylindrical, and extend vertically. As shown in Fig. 5, cylindrical winding shaft caps 20A, 20B are fitted to the upper ends of the winding rollers 4A, 4B. Inside the winding shaft caps 20A, 20B, insertion holes 21A, 21B are formed, through which drum shafts 29A, 29B are inserted, coaxially with the winding rollers 4A, 4B. The inner diameter of the insertion holes 21A, 21B is slightly larger than the outer diameter of the drum shafts 29A, 29B, thereby rotatably supporting the drum shafts 29A, 29B relative to the winding shaft caps 20A, 20B. First roller shafts 22A, 22B having a smaller diameter than the winding rollers 4A, 4B are formed to protrude from the upper ends of the winding shaft caps 20A, 20B, and insertion holes 21A, 21B extend inside the first roller shafts 22A, 22B.

[0024] Meanwhile, as shown in FIG. 1, winding shaft caps 23A and 23B are fitted to the lower ends of the winding rollers 4A and 4B. These winding shaft caps 23A and 23B are formed substantially similarly to the winding shaft caps 20A and 20B described above. Second roller shafts 24A and 24B, which are smaller in diameter than the winding rollers 4A and 4B and extend coaxially with the winding rollers 4A and 4B, are formed at the lower ends of the winding shaft caps 23A and 23B. Bearings 13A and 13B are attached to the first roller shafts 22A and 22B and the second roller shafts 24A and 24B, respectively, as rolling bearings. The winding rollers 4A and 4B are rotatably supported within the winding boxes 6A and 6B via the bearings 13A and 13B. The bearings 13A and 13B attached to the first roller shafts 22A and 22B and the second roller shafts 24A and 24B are supported within the winding boxes 6A and 6B.

[0025] The upper and lower ends of the movable bars 14A and 14B attached to the tips of the screens 3A and 3B fit into guide grooves formed in the upper horizontal frame rod 7 and the lower horizontal frame rod 8 of the screen frame 5, and are guided by the upper horizontal frame rod 7 and the lower horizontal frame rod 8 when the screens 3A and 3B are opened or closed.

[0026] In addition, the upper and lower ends of the screens 3A and 3B in the vertical direction fit into slits in inner rails (not shown) housed within the upper horizontal frame rod 7 and the lower horizontal frame rod 8, respectively, and move along the slits when opening and closing. Locking members 19A and 19B are attached to the upper and lower ends of the screens 3A and 3B, and these locking members 19A and 19B are engaged so that they can slide freely on the inner edges of the slits. This not only allows the screens 3A and 3B to be smoothly guided along the upper horizontal frame rod 7 and the lower horizontal frame rod 8 when opening and closing, but also prevents the upper and lower ends from bending due to wind pressure, etc., and coming off the upper and lower horizontal frame rods 7 and the lower horizontal frame rod 8.

[0027] The locking members 19A, 19B may be, for example, one of a pair of interlocking teeth of a slide fastener, but anything other than a tooth may be used as long as it can slide along the inner edge of the slit while being locked onto it. Similar locking members 19A, 19B are also used to connect the screens 3A, 3B to the movable crosspieces 14A, 14B. The leading ends of the screens 3A, 3B are inserted into slits formed in the movable crosspieces 14A, 14B in the vertical direction, and the locking members 19A, 19B attached to the leading ends lock onto the inner edges of the slits, thereby connecting the screens 3A, 3B to the movable crosspieces 14A, 14B.

[0028] As shown in Figures 1 and 2, the winding boxes 6A and 6B extend in the vertical direction and have a rectangular cross section. They have covers on their fronts that are attached so that they can be opened, closed, or separated by mounting members such as hinges or screws. The fronts of the winding boxes 6A and 6B are normally covered with the covers, but are configured so that the covers can be opened during maintenance or when adjusting the tension of the screens 3A and 3B.

[0029] As shown in Figures 1 and 5, the lower axial ends of the drum shafts 29A and 29B are located inside the upper side of the winding rollers 4A and 4B, and the upper axial ends of the drum shafts 29A and 29B protrude from the upper ends of the winding shaft caps 20A and 20B and extend to the top of the winding boxes 6A and 6B.

[0030] Circular cone-shaped winding drums 40A, 40B are attached to the upper ends of the drum shafts 29A, 29B, and base ends of wires 30A, 30B connecting the winding drums 40A, 40B and the movable crosspieces 14A, 14B are connected to the winding drums 40A, 40B, so that the wires 30A, 30B are wound onto and pulled out from the winding drums 40A, 40B when the screens 3A, 3B are opened or closed. More specifically, when the screens 3A, 3B are unwound from the winding rollers 4A, 4B to close the building opening 70, the wires 30A, 30B are wound onto the winding drums 40A, 40B, and when the screens 3A, 3B are wound onto the winding rollers 4A, 4B to open the building opening 70, the wires 30A, 30B are pulled out from the winding drums 40A, 40B.

[0031] As shown in Figures 7(a) and 7(b), the take-up drums 40A and 40B have truncated conical drum bodies 41A and 41B having large diameter portions 41a1 and 41b1 and small diameter portions 41a2 and 41b2. The drum bodies 41A and 41B are formed with through holes 42A and 42B that are coaxial with the drum shafts 29A and 29B and have inner diameters slightly larger than the outer diameters of the drum shafts 29A and 29B. Spring accommodating recesses 43A and 43B that are larger in diameter than the inner diameters of the through holes 42A and 42B are formed at the upper ends of the through holes 42A and 42B, and fitting recesses 44A and 44B that are provided with engaged portions 62A and 62B, which will be described later, are formed at the lower ends of the through holes 42A and 42B. The take-up drums 40A and 40B and the drum shafts 29A and 29B will be described in detail later, but both of these The screens 3A and 3B are engaged around the axis to apply tension. The engagement position P1 (see FIG. 7(a)) and the engagement state of these two are released. Axial circumference and a non-engagement position P2 (see FIG. 7(b)) in which the gears are more rotatable relative to each other.

[0032] The winding drums 40A and 40B are coaxially mounted on the drum shafts 29A and 29B with the small diameter portions 41a2 and 41b2 facing downward and the large diameter portions 41a1 and 41b1 facing upward. axis lineThe winding drums 40A, 40B are constantly biased downward by compression springs 45A, 45B (elastic members) attached to the drum shafts 29A, 29B that protrude into the spring accommodating recesses 43A, 43B.

[0033] The large diameter portions 41a1, 41b1 of the winding drums 40A, 40B are the portions that become the winding start end when winding the wire 30A, 30B (see Figure 1), and the small diameter portions 41a2, 41b2 are the portions that become the winding end when winding the wire 30A, 30B (see Figure 1). On the outer circumferential surfaces of the winding drums 40A, 40B, mating grooves 46A, 46B into which the wound wire 30A, 30B fits are formed so as to spirally connect the large diameter portions 41a1, 41b1 and the small diameter portions 41a2, 41b, and the wire 30A, 30B is configured to be wound spirally along these mating grooves 46A, 46B. The small diameter portions 41a2, 41b are formed with annular flange portions 47A, 47B to prevent the wires 30A, 30B from coming off the winding drums 40A, 40B, and the position where the wires 30A, 30B abut or come close to these flange portions 47A, 47B is set to be the winding end of the wires 30A, 30B.

[0034] 8, the rotation direction a when the winding rollers 4A, 4B wind up the screens 3A, 3B and the rotation direction b when the winding drums 40A, 40B wind up the wires 30A, 30B are opposite to each other, and in this embodiment, the rotation direction a when the winding rollers 4A, 4B wind up the screens 3A, 3B is set to be clockwise, and the rotation direction b when the winding drums 40A, 40B wind up the wires 30A, 30B is set to be counterclockwise. However, these rotation directions may be reversed.

[0035] Furthermore, the lengths of the screens 3A, 3B and the lengths of the wires 30A, 30B are related so that when the screens 3A, 3B are fully open (see Figure 8), i.e., when the screens 3A, 3B are completely wound around the winding rollers 4A, 4B, the single wire portions 30A1, 30B1 (described later) of the wires 30A, 30B are completely pulled out from the winding drums 40A, 40B, and when the screens 3A, 3B are fully closed (see Figure 10), i.e., when the screens 3A, 3B are completely unwound from the winding rollers 4A, 4B, the single wire portions 30A1, 30B1 of the wires 30A, 30B are completely wound around the winding drums 40A, 40B.

[0036] Furthermore, the diameter φd1 at the winding start position of the winding drums 40A, 40B is approximately equal to the winding diameter φD1 of the screens 3A, 3B when the winding rollers 4A, 4B have wound up the screens 3A, 3B and fully opened, and the diameter φd2 at the winding end position of the winding drums 40A, 40B, i.e., the diameter φd2 of the small diameter portions 41a2, 41b, is set to be approximately equal to the outer diameter φD2 of the winding rollers 4A, 4B.

[0037] As shown in Figures 1 and 2, the wires 30A and 30B have single-wire sections 30A1 and 30B1 located closer to the base end than the branch sections 31A and 31B, and double-wire sections 30A2 and 30B2 located closer to the tip end than the branch sections 31A and 31B. The single-wire sections 30A1 and 30B1 consist of a single wire 30a1 and 30b1, and the double-wire sections 30A2 and 30B2 are branched into two wires 30a2, 30a3, 30b2 and 30b3. The single wire sections 30A1, 30B1 are the sections that are wound onto or pulled out from the winding drums 40A, 40B when the screens 3A, 3B are opened or closed, while the two wires 30a2, 30a3, 30b2, 30b3 in the double wire sections 30A2, 30B2 are wound around a plurality of guide pulleys 33a, 33b, 33c, 33d, 33e, 33f provided within the screen frame 5, and then the tips of one of the wires 30a2, 30b2 are connected from the guide pulleys 33a, 33d at the upper ends of the winding boxes 6A, 6B to the upper ends of the movable crosspieces 14A, 14B, and the tips of the other wires 30a3, 30b3 are connected from the guide pulleys 33b, 33e at the lower ends of the winding boxes 6B, 6A to the lower ends of the movable crosspieces 14A, 14B.

[0038] 5, the lower ends of the drum shafts 29A, 29B protrude from the lower ends of the winding shaft caps 20A, 20B (first roller shafts 22A, 22B) into the interior of the winding rollers 4A, 4B, and coil springs 34A, 34B are disposed around the lower ends of the drum shafts 29A, 29B. The lower ends (one end) of the coil springs 34A, 34B are fixed to the drum shafts 29A, 29B, and the upper ends (the other end) of the coil springs 34A, 34B are fixed to the winding shaft caps 20A, 20B, so that the winding rollers 4A, 4B are connected to the drum shafts 29A, 29B via the coil springs 34A, 34B.

[0039] An initial twist is applied to the coil springs 34A, 34B in advance to increase the number of windings. This initial twist constantly applies a torsional force (rotational force) to the winding rollers 4A, 4B and the drum shafts 29A, 29B in a direction that causes the coil springs 34A, 34B to unwind. The torsional force acts in opposite directions on the winding rollers 4A, 4B and the drum shafts 29A, 29B. As shown in FIG. 8, the torsional force acts in the winding rollers 4A, 4B in the direction a, in which the screens 3A, 3B are wound, i.e., clockwise, while the torsional force acts in the drum shafts 29A, 29B in the direction b, in which the winding drums 40A, 40B wind the wires 30A, 30B, i.e., counterclockwise. This constantly applies tension to the screens 3A, 3B and the wires 30A, 30B, preventing malfunctions due to loosening.

[0040] 3 to 7, the screen winding mechanisms 10A and 10B of this embodiment are provided with engaging portions 61A and 61B fixed to the drum shafts 29A and 29B facing the drum end faces 48A and 48B formed at the lower ends of the winding drums 40A and 40B, and engaged portions 62A and 62B formed on the drum end faces 48A and 48B of the winding drums 40A and 40B and engageable with the engaging portions 61A and 61B. The engaging portions 61A and 61B are provided with annular engaging bases 61a1 and 61b1 surrounding the drum shafts and a surface of the engaging bases 61a1 and 61b1 facing the winding drums 40A and 40B. Drum shaft circumferenceA plurality of protrusions 61a2, 61b2 are formed at equal intervals on the winding rollers 4A, 4B side of the engagement bases 61a1, 61b1. Axial circumference The engaged portions 62A, 62B have a plurality of recesses 62a1, 62b1 formed at equal intervals around the drum axis on the bottom surfaces of the fitting recesses 44A, 44B formed in the drum end surfaces 48A, 48B of the winding drums 40A, 40B. The recesses 62a1, 62b1 are engageable with the protrusions 61a2, 61b2.

[0041] The engaging portions 61A, 61B have through holes 62a2, 62b2 through which the drum shafts 29A, 29B are inserted, and the protrusions 61a2, 61b2 formed on the engaging bases 61a1, 61b1 are trapezoidal in plan view. axis line A pair of side surfaces 61a4, 61b4 (see FIG. 4(b)) are formed, rising in the radial direction and extending in the radial direction, and the tips (upper ends) of the convex portions 61a2, 61b2 are formed flat. In this embodiment, the pair of side surfaces 61a4, 61b4 are formed such that the angle α they form around the drum shaft is approximately 45 degrees, and the angle β between adjacent convex portions 61a2, 61b2 around the drum shaft is approximately 90 degrees, so that four convex portions 61a2, 61b2 are formed around the drum shaft. The engaging portions 61A, 61B are fixed by locking devices such as pins 65A, 65B so as to be unable to rotate relatively to the drum shafts 29A, 29B.

[0042] The operating portions 61a3, 61b3 are formed in an annular shape around the drum shaft, and the outer diameters of the operating portions 61a3, 61b3 are larger than the small-diameter portions 41a2, 41b2 of the winding drums 40A, 40B. In this embodiment, the outer diameters of the operating portions 61a3, 61b3 are approximately the same as the outer diameters of the flange portions 47A, 47B. This prevents the operator's fingers from coming into contact with the winding drums 40A, 40B or the wires 30A, 30B (see FIG. 8) when rotating the operating portions 61a3, 61b3. Furthermore, the outer peripheral edges of the operating portions 61a3, 61b3 have multiple projections and recesses formed continuously in the circumferential direction, improving operability when rotating the operating portions 61a3, 61b3.

[0043] The engaged portions 62A, 62B are provided in mating recesses 44A, 44B formed in the drum end faces 48A, 48B of the winding drums 40A, 40B. The mating recesses 44A, 44B are formed in cylindrical shapes that are coaxial with the through holes 42A, 42B and recessed into the drum end faces 48A, 48B, and the inner diameters of the mating recesses 44A, 44B are slightly larger than the outer diameters of the engagement bases 61a1, 61b1 of the engaging portions 61A, 61B. A plurality of recesses 62a1, 62b1 of the engaged portions 62A, 62B are formed on the bottom surfaces of the mating recesses 44A, 44B. The recesses 62a1, 62b1 are formed in trapezoidal shapes that are slightly larger than the protrusions 61a2, 61b2 of the engaging portions 61A, 61B in a bottom view, and on both sides of the recesses 62a1, 62b1 around the drum axis, axis line The recesses 62a1 and 62b1 have flat bottom surfaces, and inner surface portions 62a3 and 62b3 are formed so as to stand in the vertical direction and extend in the radial direction.

[0044] In this embodiment, the pair of inner surface portions 62a3, 62b3 are Axial circumference The angle α between the two is approximately 45 degrees. Axial circumferenceThe angle β between adjacent recesses 62a1, 62b1 is approximately 90 degrees, so that four recesses 62a1, 62b1 are formed on the bottom surfaces of fitting recesses 44A, 44B. Therefore, when the engaging bases 61a1, 61b1 of the engaging portions 61A, 61B are inserted into the fitting recesses 44A, 44B of the engaged portions 62A, 62B of the winding drums 40A, 40B, the protrusions 61a2, 61b2 are inserted into the four recesses 62a1, 62b1, respectively. When the side surfaces 61a4, 61b4 of the convex portions 61a2, 61b2 are brought into contact with the inner surfaces 62a3, 62b3 of the concave portions 62a1, 62b1, the engaged portions 62A, 62B and the engaging portions 61A, 61B are brought into an engaged state, whereby the take-up drums 40A, 40B and the drum shafts 29A, 29B is in charge The state is switched to the matching position P1 (see FIG. 5).

[0045] Also, At the engagement position P1, When the winding drums 40A, 40B are moved in a direction (upward) away from the engaging portions 61A, 61B along the drum shafts 29A, 29B, the engagement between the engaged portions 62A, 62B and the engaging portions 61A, 61B is released, resulting in a disengaged state, and the winding drums 40A, 40B and the drum shafts 29A, 29B , non The state is switched to the engagement position P2 (see FIG. 6). The number of each of the convex portions 61a2, 61b2 and concave portions 62a1, 62b1 is not limited to four, but may be at least two or more.

[0046] Next, we will explain the operation of the screen unit 1. Figures 8 to 10 are schematic plan views of the screen unit 1 in which the coaxially arranged winding rollers 4A, 4B and winding drums 40A, 40B are separated from each other and the number of turns of the coil springs 34A, 34B is reduced, with Figure 8 showing the screens 3A, 3B in a fully open state, Figure 9 showing the screens 3A, 3B in a half-open state, and Figure 10 showing the screens 3A, 3B in a fully closed state.

[0047] 8, in the screen device 1, when the screens 3A, 3B are fully opened, a rotational force in the direction of arrow a acts on the winding rollers 4A, 4B due to the coil springs 34A, 34B to which an initial twist has been applied, and a rotational force in the direction of arrow b acts on the drum shafts 29A, 29B, i.e., the winding drums 40A, 40B. From this state, when the movable crosspieces 14A, 14B are moved leftward in the figure (in the direction of arrow m) to unwind the screens 3A, 3B from the winding rollers 4A, 4B, the winding rollers 4A, 4B rotate in the direction of arrow b, twisting the coil springs 34A, 34B, and the drum shafts 29A, 29B and winding drums 40A, 40B rotate in the direction of arrow b due to the biasing force. Therefore, as shown in Figures 9 and 10, the winding drums 40A, 40B spirally wind up the wires 30A, 30B of a length corresponding to the movement amount of the movable bars 14A, 14B (the amount of payout of the screens 3A, 3B) along the engagement grooves 46A, 46B (see Figure 7(a)) from the large diameter portions 41a1, 41b1 side of the winding drums 40A, 40B toward the small diameter portions 41a2, 41b2 side.

[0048] At this time, due to the difference in diameter between the winding diameter of the screen 3A, 3B by the winding rollers 4A, 4B and the winding diameter of the wire 30A, 30B by the winding drums 40A, 40B, a rotational difference occurs between the winding rollers 4A, 4B and the drum shafts 29A, 29B (winding drums 40A, 40B), which may result in a decrease in the tension acting on the screen 3A, 3B and the wire 30A, 30B. However, the torque of the coil springs 34A, 34B to which an initial twist has been applied constantly applies tension to the screen 3A, 3B and the wire 30A, 30B.

[0049] Furthermore, although the number of twists (number of turns) of the coil springs 34A, 34B may increase or decrease slightly due to the difference in rotation between the winding rollers 4A, 4B and the drum shafts 29A, 29B (winding drums 40A, 40B), the winding diameter of the screens 3A, 3B around the winding rollers 4A, 4B and the winding diameter of the wires 30A, 30B around the winding drums 40A, 40B are set to change proportionally, and no large difference occurs between the two regardless of the open / closed state of the screens 3A, 3B, so the number of turns of the coil springs 34A, 34B does not increase or decrease significantly. Therefore, the operating force required to unwind the screens 3A, 3B from the fully open position in Fig. 8, via the half open position in Fig. 9, to the fully closed position in Fig. 10 remains approximately constant, and the screens 3A, 3B can also be stopped in the half open position in Fig. 10.

[0050] Next, a case will be described in which the movable bars 14A, 14B are moved to the right in the figure (in the direction of arrow n) to move the screens 3A, 3B from the fully closed position in Fig. 10 to the half-open position in Fig. 9 and then to the fully open position in Fig. 8, thereby winding the screens 3A, 3B onto the winding rollers 4A, 4B. In this case, as the wires 30A, 30B are pulled out from the winding drums 40A, 40B, the winding drums 40A, 40B and drum shafts 29A, 29B rotate in the direction of arrow a, twisting the coil springs 34A, 34B, and the resulting torsional force causes the winding rollers 4A, 4B to rotate in the direction of arrow a, thereby winding up the screens 3A, 3B. As described above, the difference in diameter between the winding diameter of the screen 3A, 3B around the winding rollers 4A, 4B and the winding diameter of the wire 30A, 30B around the winding drums 40A, 40B causes a rotational difference between the winding rollers 4A, 4B and the drum shafts 29A, 29B (winding drums 40A, 40B), which may reduce the tension acting on the screen 3A, 3B and the wire 30A, 30B. However, the torque of the coil springs 34A, 34B, to which an initial twist has been applied, constantly applies tension to the screen 3A, 3B and the wire 30A, 30B. Furthermore, even if the number of twists of the coil springs 34A, 34B slightly increases or decreases due to the rotational difference between the winding drums 40A, 40B and the winding rollers 4A, 4B, the number of turns of the coil springs 34A, 34B does not significantly increase or decrease, as described above. Therefore, the operating force required to open the screen 3A, 3B remains approximately constant.

[0051] Next, the operation of adjusting the tension of the screens 3A and 3B will be described. When adjusting the tension of the screens 3A and 3B, the screens 3A and 3B may be in any position where the building opening 70 is closed, opened, or in an intermediate position between these positions. Hakamaki Intake drums 40A, 40B and drum shafts 29A, 29B but 6 and 7(b) show the state where the clutch lever is switched to the engagement position P1. is winding Drums 40A, 40B and drum shafts 29A, 29B But This shows the state where the clutch is switched to the engagement position P2.

[0052] As shown in FIGS. 5 and 7(a), the winding drums 40A and 40B are engaged with the engagement portions 61A and 61B. When moving in the direction closer to The convex portions 61a2, 61b2 of the engaging portions 61A, 61B are inserted into the concave portions 62a1, 62b1 of the engaged portions 62A, 62B, and the engaged portions 62A, 62B and the engaging portions 61A, 61B are engaged with each other, whereby the take-up drums 40A, 40B and the drum shafts 29A, 29B are switched to the engagement position P1. In this state, the compression springs 45A, 45B fixed to the drum shafts 29A, 29B urge the concave portions 62a1, 62b1 toward the convex portions 61a2, 61b2 via the take-up drums 40A, 40B, preventing the engaged portions 62A, 62B from moving away from the engaging portions 61A, 61B. Furthermore, when the engaged portions 62A, 62B and the engaging portions 61A, 61B are engaged with each other, the side surfaces 61a4, 61b4 of the convex portions 61a2, 61b2 and the inner surfaces 62a3, 62b3 of the concave portions 62a1, 62b1 are able to come into contact with each other, so the take-up drums 40A, 40B and the drum shafts 29A, 29B are Axial circumference This allows the torsional force accumulated in the coil springs 34A and 34B to be transmitted to the winding rollers 4A and 4B and the drum shafts 29A and 29B as a rotational force in the direction of winding the screens 3A and 3B and the wires 30A and 30B.

[0053] At the engagement position P1When the winding drums 40A, 40B are moved upward away from the engaging portions 61A, 61B against the biasing force of the compression springs 45A, 45B, the convex portions 61a2, 61b2 of the engaging portions 61A, 61B are removed from the concave portions 62a1, 62b1 of the engaged portions 62A, 62B, and the engaged portions 62A, 62B and the engaging portions 61A, 61B are disengaged from each other, as shown in Figures 6 and 7(b), and the winding drums 40A, 40B and the drum shafts 29A, 29B are switched to the non-engagement position P2. Axial circumference Since rotation is permitted, the take-up drums 40A and 40B do not rotate even when the drum shafts 29A and 29B are rotated.

[0054] This means: At the non-engagement position P2, When the engaging portions 61A, 61B are rotated via the operating portions 61a3, 61b3, the lower ends (one ends) of the coil springs 34A, 34B connected to the drum shafts 29A, 29B rotate around the drum shaft relative to the upper ends (the other ends) of the coil springs 34A, 34B connected to the winding rollers 4A, 4B, twisting the coil springs 34A, 34B, which are in an initially twisted state. At this time, if the twisting direction is the same as the initial twist direction, the amount of twist of the coil springs 34A, 34B increases, and if the twisting direction is opposite to the initial twist direction, the amount of twist of the coil springs 34A, 34B decreases. When the amount of twist of the coil springs 34A, 34B increases, an increased biasing force is generated in the coil springs 34A, 34B, which tries to return them to their initially twisted state, thereby increasing the tension applied to the screens 3A, 3B. On the other hand, when the amount of twist of the coil springs 34A and 34B is reduced, the biasing force of the coil springs 34A and 34B to return to the initial twisted state is reduced, so that the tension applied to the screens 3A and 3B can be reduced. By rotating the springs 34A and 34B by a predetermined angle around the drum shaft and then switching them to the engagement position P1, the torsional force of the coil springs 34A and 34B can be changed in stages. The tension of the screens 3A and 3B can be adjusted by changing the torsional forces of the coil springs 34A and 34B.

[0055] In this embodiment, as shown in FIG. 3(a) and FIG. 4(a), the engagement portions 61A and 61B are Axial circumferenceEach time the movable bars 14A, 14B are rotated by a predetermined angle (45 degrees) in the opposite direction, the recessed portions 62a1, 62b1 of the engaged portions 62A, 62B engage with the protruding portions 61a2, 61b2 of the engaging portions 61A, 61B, thereby allowing the adjustment of the amount of twist of the coil springs 34A, 34B to be increased or decreased in stages. This allows for fine adjustment of the tension of the screens 3A, 3B. Furthermore, the movable bars 14A, 14B can be stopped at any of the open position, closed position, and intermediate positions of the screens 3A, 3B, allowing adjustment of the coil springs 34A, 34B regardless of the position of the screens 3A, 3B.

[0056] As described above, according to the screen device 1 of this embodiment, the engaging portions 61A, 61B are fixed to the drum shafts 29A, 29B, and the engaged portions 62A, 62B that can be engaged with the engaging portions 61A, 61B are formed on the winding drums 40A, 40B, so that the winding drums 40A, 40B are fixed to the drum shafts 29A, 29B. Axial direction By providing the winding drums 40A, 40B and the drum shafts 29A, 29B so as to be movable in the direction , engagement position P1 and non-engagement position P2 With this, when the winding drums 40A, 40B and the drum shafts 29A, 29B are switched to the non-engagement position P2, the drum shafts 29A, 29B can be moved via the operation units 61a3, 61b3. By rotating the coil springs 34A and 34B around the axis and returning them to the engagement position P1, the torsional force of the coil springs 34A and 34B can be changed in stages, thereby making it possible to appropriately adjust the tension applied to the screens 3A and 3B. .

[0057] In the above-described embodiment, the engaging portions 61A, 61B are disposed below the winding drums 40A, 40B, but the engaging portions 61A, 61B can also be disposed above the winding drums 40A, 40B. above and the small diameter portions 41a2 and 41b2 are under The large diameter portions 41a1 and 41b1 are attached to the drum shafts 29A and 29B in the opposite direction. under and the small diameter portions 41a2 and 41b2 are above It is also possible to attach the drum shafts 29A and 29B in the orientation shown. [Explanation of symbols]

[0058] 1 Screen device 3A, 3B screen 4A, 4B Winding roller 10A, 10B Screen winding mechanism 14A, 14B Movable crosspiece 29A, 29B drum shaft 30A, 30B wire 34A, 34B Coil spring 40A, 40B Winding drum 41a1, 41b1 Large diameter part 41a2,41b2 Small diameter part 45A, 45B Compression spring (elastic member) 46A,46B Fitting groove 48A, 48B Drum end face 61A,61B Engagement part 61a1,61b1 Engagement base 61a2, 61b2 Convex part 61a3,61b3 Operation section 62A,62B Engaged part 62a1, 62b1 Recess 70 Building Openings P1 Engagement position P2 Disengaged position

Claims

1. The present invention comprises a screen for opening and closing a building opening, and a screen winding mechanism for winding and unwinding the screen while applying tension to the screen, The screen winding mechanism includes: a winding roller that is rotatably supported around an axis in the building opening and that is connected to an end of the winding side of the screen to wind up the screen; a winding drum disposed coaxially with the winding roller; a drum shaft that is disposed coaxially with the winding roller and the winding drum, that is supported by the winding roller so as to be rotatable relative to the winding roller, and that has the winding drum attached thereto; a wire having one end connected to the winding drum and the other end connected to an end of the screen on the payout side; a coil spring having one end connected to the winding roller and the other end connected to the drum shaft, A screen device that applies tension to the screen by causing the torsional force of the coil spring to act on the winding roller and the winding drum as a rotational force in a direction in which the screen and the wire are wound up, The winding drum and the drum shaft are configured to be switchable between an engaged position where they are engaged around the axis to apply tension to the screen, and a disengaged position where they are disengaged and can rotate relatively around the axis, With the winding drum and the drum shaft switched to the disengagement position, the drum shaft is rotated about the axis to change the torsional force of the coil spring, thereby adjusting the tension applied to the screen. A screen device characterized by:

2. The winding drum is further attached to the drum shaft so as to be movable along the axial direction, the screen winding mechanism has an engaging portion fixed to the drum shaft and an engaged portion formed on the winding drum that can be engaged with and disengaged from the engaging portion as the winding drum moves in the axial direction, The winding drum and the drum shaft are switched to the engaged position when the winding drum is moved in the axial direction in a direction approaching the engaging portion to engage the engaged portion with the engaging portion, and are switched to the non-engaged position when the winding drum is moved in a direction away from the engaging portion to release the engagement between the engaged portion and the engaging portion.

2. The screen device according to claim 1.

3. the engaging portion has an engaging base disposed around the drum shaft, and a plurality of convex portions or concave portions formed at equal intervals around the drum shaft on an end surface of the engaging base facing the winding drum, the engaged portion is formed on a surface of the winding drum facing the engaging portion at equal intervals around the drum axis, and includes either the convex portion or the concave portion engageable with the other of the convex portion or the concave portion, The screen winding mechanism is capable of gradually changing the torsional force of the coil spring by rotating the drum shaft around the axis at the disengaged position and then switching it to the engaged position.

3. The screen device according to claim 2.

4. the winding drum has a fitting recess in which the engagement base is insertably and removably fitted on a drum end surface facing the engagement portion, The recess or the protrusion that can be engaged with the protrusion or the recess of the engaging portion is formed on a bottom surface of the fitting recess that faces the engaging portion.

4. The screen device according to claim 3.

5. the engaging portion has an operating portion that is disposed at a position spaced apart from the drum end surface when in the engaged position, The operating portion protrudes radially outward from the drum end surface.

5. The screen device according to claim 4.

6. The drum shaft is provided with an elastic member that biases the take-up drum toward the engagement portion, At the engagement position, the engaging portion is pressed against the engaged portion by the elastic member.

3. The screen device according to claim 2.

7. The winding drum is formed in a truncated cone shape and has a large diameter portion that serves as a winding start end when winding the wire, and a small diameter portion that serves as a winding end end when winding the wire, A fitting groove into which the wound wire is fitted is formed on the outer periphery of the winding drum so as to connect the large diameter portion and the small diameter portion in a spiral shape.

7. The screen device according to claim 1, wherein the first and second projections are arranged parallel to each other.

8. the diameter of the portion of the large diameter portion of the winding drum that becomes the winding start end is equal to the winding diameter of the screen when the winding roller has wound the screen and fully opened, and the diameter of the portion of the small diameter portion of the winding drum that becomes the winding end is equal to the diameter of the winding roller.

8. The screen device according to claim 7.

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