JP7236210B2 - Shielding device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielding device in which the load of a driving shaft for raising and lowering a shielding material is constant.

Pleated screens and horizontal blinds are known as examples of shielding devices that raise and lower shielding materials. The pleated screen has a screen as a shielding material, and as the screen descends, the load of the descending screen is removed from the lifting cords in order from the top of the screen. The horizontal blind has a plurality of slats as a shielding material, and as the slats of each tier descend, the slats of each tier are supported by ladder cords in order from the top slat. The rotational torque of the drive shaft that raises and lowers these shielding materials decreases as the shielding material is lowered as the shielding material is lowered, and on the contrary, as the shielding material is raised, it increases as the shielding material's load increases. . As a result, changes in the rotational torque on the drive shaft force the user driving the drive shaft to adjust its operating force.

Therefore, in the shielding device that raises and lowers the shielding material, a lifting device that uses a constant load spring that can apply a constant rotational torque to the drive shaft regardless of the elevation of the shielding material is configured. Techniques have been disclosed for suppressing fluctuations in the rotational torque applied to the shielding material and for enabling automatic lifting and lowering of the shielding material (see, for example, Patent Document 1).

JP-A-2000-130052

As described above, Patent Document 1 discloses a lifting device technique that utilizes a constant force spring that can apply a constant rotational torque to a drive shaft regardless of whether the shielding material is raised or lowered. It is By constructing the lifting device using such a constant force spring, it is possible to improve the operability during the lifting operation by gripping the bottom rail (weight member) provided at the lower end of the shielding material, for example.

However, by using a lifting device that uses a constant force spring, it is possible to improve the operability of the lifting operation by gripping the bottom rail (weight member), but the top that is out of reach and the bottom that is difficult to operate. There is room for improvement such as further improvement of operability, improvement of safety, reduction of operation load, etc.

In view of the above-mentioned problems, the object of the present invention is to make the load of the drive shaft for raising and lowering the shield constant, to further improve operability, preferably improve safety, and reduce the operation load. To provide a shielding device capable of

A shielding device according to one aspect of the present invention is a shielding device that enables a shielding material to be moved up and down, and operates a drive shaft for raising and lowering the shielding material and a rail attached to the lower end of the shielding material. a first elevating operation means for enabling the shielding member to be raised and lowered by rotating the drive shaft; a means for applying rotational torque to the drive shaft so that it can be accommodated; an operating pulley engaged and connected to the operating shaft; and an operating pulley that is hung on the operating pulley and has two ends that are unconnected and suspended to have a grip attached, or has an endless shape. a second elevating operation means having an auxiliary operating device having an operation code; and a predetermined rotation of the operating shaft in order to shorten the operation amount related to the elevating operation of the shielding material by the second elevating operation means. and a speed increasing means for increasing the speed at a transmission ratio of and transmitting it to the drive shaft , so that the rotation of the drive shaft at the time of operation of the first lifting operation means is transmitted to the second lifting operation means. It is characterized by being configured to

In one aspect of the shielding device according to the present invention, the means for applying rotational torque to the drive shaft comprises a constant load spring or motor spring for applying the rotational torque to the drive shaft. do .

Further, in the shielding device of one aspect according to the present invention, the function of preventing the rail from dropping due to its own weight and the auxiliary function of the means for applying the rotational torque to the drive shaft serve as a braking load on the rotational torque so as to reduce the operation load. A braking means having either one or both of a function of providing

Further, in the shielding device according to one aspect of the present invention, the shielding member comprises a plurality of shielding members. One of the plurality of shielding members is suspended from the headbox of the shielding device and supports the first rail. The other of the shielding members is hung from the first rail and supports the second rail, and the braking means is an elevating cord that supports each of the first rail and the second rail so as to be able to ascend and descend. resistance to the movement of each corresponding lifting cord at one or more winding shafts among a plurality of winding shafts for winding or rewinding the first lifting operation means; is configured to operate each of the first rail and the second rail to enable elevation of the corresponding shielding material, and the second elevation operation means is configured to operate each of the plurality of winding shafts each of the plurality of shielding members can be moved up and down by manipulating the forward and reverse rotation of the plurality of drive shafts engaged with the drive shafts, and the means for applying rotational torque to the drive shafts is the plurality of drive shafts The braking means has a function of preventing the first rail and the second rail from dropping due to their own weight, and an auxiliary function of the means for applying rotational torque to the drive shaft. or a function of applying a braking load to the rotational torque so as to reduce the load.

According to the present invention, the load of the drive shaft for raising and lowering the shielding material is set to a constant load, and the operability at the time of raising and lowering operation by gripping the bottom rail (weight member) is improved. It is possible to further improve operability in the upper part and the lowest part where it is difficult to operate, and more preferably, improve safety and reduce the operation load.

1(a) and 1(b) are a plan view and a front view, respectively, showing a schematic configuration of a pleated screen as an example of a shielding device according to a first embodiment of the present invention; FIG. 1 is a perspective view showing a schematic configuration of a gear unit in a pleated screen as an example of a shielding device of a first embodiment according to the present invention; FIG. 1 is an exploded perspective view showing a schematic configuration of a gear unit in a pleated screen as an example of a shielding device of a first embodiment according to the present invention; FIG. 1 is a perspective view showing a schematic configuration of a constant load unit in a pleated screen as an example of a shielding device of a first embodiment according to the present invention; FIG. 1 is an exploded perspective view showing a schematic configuration of a constant load unit in a pleated screen as an example of a shielding device according to a first embodiment of the present invention; FIG. FIG. 3 is a perspective view showing an example of connection between a gear unit and a constant load unit in the pleated screen as an example of the shielding device of the first embodiment according to the present invention; (a), (b), and (c) are diagrams each showing the effect of the presence or absence of a constant load unit in the pleated screen as an example of the shielding device of the first embodiment according to the present invention. 4(a) and 4(b) are plan views showing connection examples of a plurality of constant load units and gear units in the pleated screen as an example of the shielding device of the first embodiment according to the present invention, respectively. FIG. (a) and (b) are respectively a front view and a side view showing a schematic configuration of a winding unit in the pleated screen as an example of the shielding device of the first embodiment according to the present invention. 1 is a perspective view showing a schematic configuration of a shaft cover functioning as a brake mechanism of a winding unit in a pleated screen as an example of a shielding device of a first embodiment according to the present invention; FIG. (a) is a plan view showing a schematic configuration of a winding unit in the pleated screen as an example of the shielding device of the first embodiment according to the present invention, and (b) and (c) are lifting cords in the winding unit. FIG. 10 is a cross-sectional view illustrating an example of distribution of the . 1(a) and 1(b) are perspective views showing schematic configurations of an example and another example of an auxiliary operation device in a pleated screen as an example of a shielding device of a first embodiment according to the present invention, respectively. FIG. 4 is a perspective view showing the operation of an auxiliary operation device of one example in the pleated screen as an example of the shielding device of the first embodiment according to the present invention; (a), (b) is a side view which shows the operation|movement at the time of downward operation regarding the bottom rail of the pleated screen as an example of the shielding apparatus of 1st Embodiment by this invention, and an upward operation, respectively. (a) and (b) are respectively a plan view and a front view showing a schematic configuration of a pleated screen as an example of a shielding device according to a second embodiment of the present invention. (a) is a plan view showing a schematic configuration of a winding unit in a pleated screen as an example of a shielding device according to a second embodiment of the present invention; (b) and (c) are elevation cords in the winding unit; FIG. 10 is a cross-sectional view illustrating an example of distribution of the . (a), (b) is a side view which shows the operation|movement at the time of downward operation regarding the intermediate rail of the pleat screen as an example of the shielding apparatus of 1st Embodiment by this invention, and an upward operation, respectively. (a) and (b) are respectively a plan view and a front view showing a schematic configuration of a pleated screen of modification 1 in which the constant load unit and the gear unit are rearranged as an example of the shielding device of the second embodiment according to the present invention. is. (a) and (b) are respectively a plan view and a front view showing a schematic configuration of a pleated screen of modified example 2 in which a gear unit is partially omitted as an example of a shielding device according to a second embodiment of the present invention.

Hereinafter, a pleated screen will be described as an example of the shielding device of each embodiment according to the present invention with reference to the drawings. In the specification of the present application, with respect to the front view of the pleated screen shown in FIG. The left direction in the figure is defined as the left side of the pleat screen, and the right direction in the figure is defined as the right side of the pleat screen. In addition, in the examples described below, with respect to the front view of the pleated screen shown in FIG. 1, the viewing side is the front side (or front side), and the opposite side is the rear side (or rear side).

[First embodiment]
(overall structure)
1(a) and 1(b) are respectively a plan view and a front view showing a schematic configuration of a pleated screen as an example of a shielding device according to a first embodiment of the present invention. As shown in FIG. 1, the pleated screen of this embodiment includes a screen 10, which is an example of a shielding material, and a headbox 20. As shown in FIG.

The screen 10 is bent vertically in a zigzag shape from the headbox 20 , the upper end of the screen 10 is connected to the headbox 20 , and the lower end of the screen 10 is connected to the bottom rail 11 . A handle 12 is attached to substantially the center of the bottom rail 11 in the left-right direction, and the screen 10 is moved up and down by the user.

The headbox 20 includes, inside the headbox 20, one drive shaft 30, two winding units 40 in this example, two gear units 50, one constant load unit 60, It has one operating shaft 80 and an auxiliary operating device 15 .

The driving shaft 30 has a polygonal prism shape (hexagonal prism shape in this example) extending in the left-right direction, and is engaged with the winding shaft 41 of each winding unit 40, each gear unit 50, and the constant load unit 60. Although it extends almost entirely in the left-right direction within the head box 20, it is not directly engaged with the auxiliary operation device 15, which will be described later in detail.

Each winding unit 40 includes a winding shaft 41 , a shaft case 42 and a shaft cover 43 . The winding shaft 41 has a truncated cone shape that rotates together with the drive shaft 30 and is rotatably supported on the shaft case 42 . As the drive shaft 30 rotates, the take-up shaft 41 can take up or unwind the upper end of the lift cord 13 whose lower end is attached to the bottom rail 11 and penetrates the screen 10 in this example. Further, the shaft cover 43 is arranged at the base end portion of the winding shaft 41 in each winding unit 40, and provides resistance to the movement of the lifting cord 13 wound around the winding shaft 41, so that the bottom rail can be moved. It functions as a brake mechanism that prevents 11 from dropping under its own weight.

The two gear units 50 have the same structure, and one of the two gear units 50 (the left side in the figure) is connected to the constant load unit 60, and the constant load unit 60 is engaged with the drive shaft 30. Apart from the engagement shaft (engagement shaft 63 shown in FIG. 5), the rotation of the drive shaft 30 is reduced by a predetermined transmission ratio (gear ratio in this example), and the transmission shaft (shown in FIG. 5) of the constant load unit 60 is reduced. The other (on the right side in the drawing) rotates the operating shaft 80 inserted through the connecting member 70 and engaged with the transmission shaft 65) at the predetermined transmission ratio (gear ratio in this example). It operates as speed increasing means for increasing the speed and transmitting it to the drive shaft 30 .

The constant load unit 60 maintains the drive shaft 30 regardless of the screen 10 up/down state so that the operating load of the handle 12 is substantially constant within a predetermined load (constant load range) over the entire elevation range of the screen 10 . It functions as a constant load means that applies a substantially constant rotational torque to the Although the details will be described later with reference to FIG. 5, the constant load unit 60 of this example uses the gear unit 50 on the left side of FIG. ) and the engagement shaft (engagement shaft 63 shown in FIG. 5) engaged with the drive shaft 30 are connected by a constant load spring 64, and the bottom rail It is configured to apply substantially constant rotational torque to the drive shaft 30 irrespective of the elevation position of 11 .

The auxiliary operating device 15 shown in FIG. is arranged at one end (the right end in this example) of the head box 20 . In this example, the operation box 90 is configured to have a simple supporting function, so the pulley case 16 may be fitted to one end of the head box 20 without using the operation box 90 .

In the example shown in FIG. 1, the operation cord 18 is composed of a ball chain with two hanging ends with both ends disconnected. An indoor grip 19F and an outdoor grip 19R are attached to each end of the operation cord 18, respectively. The operation cord 18 may be configured with a string-like cord, or may be configured with an endless ball chain or a string-like cord.

The operating pulley 17 is configured to rotate when the operating cord 18 is pulled, and one end of the operating shaft 80 is engaged with the axial center of the operating pulley 17 so as not to rotate relative to the operating pulley 17 . The other end of the operating shaft 80 is inserted into and engaged with the gear unit 50 on the right side of FIG. (Gear ratio in this example) and transmitted to the drive shaft 30 .

Therefore, when the operation cord 18 is pulled, the operation pulley 17 rotates, and the rotation of the operation pulley 17 rotates the operation shaft 80 integrally. The speed is increased and transmitted to the drive shaft 30 .

Therefore, by rotating the operation pulley 17 forward and backward by pulling the operation cord 18, the drive shaft 30 is rotated forward and backward, and the screen 10 can be raised and lowered while utilizing the action of the constant load unit 60.

Hereinafter, more specifically, the structures of the gear unit 50, the constant load unit 60, the winding unit 40 with the shaft cover 43 functioning as a brake mechanism, and the auxiliary operating device 1 will be described in order.

(gear unit)
FIG. 2 is a perspective view showing a schematic configuration of the gear unit 50 according to this embodiment. Moreover, FIG. 3 is an exploded perspective view showing a schematic configuration of the gear unit 50 according to this embodiment.

First, as shown in FIG. 2, the gear unit 50 has a box-like shape and can be connected via a connecting member 70 to an operating shaft 80 as an input shaft. The connecting member 70 is formed with a hexagonal hole 70H through which the hexagonal column-shaped operating shaft 80 is inserted and engaged, and a hexagonal shaft 70a is formed at one end of the connecting member 70 in this example. When the hexagonal shaft 70a of the connecting member 70 engages with the hexagonal hole 55H formed through the large-diameter gear 55 in the gear unit 50, the large-diameter gear 55 rotates together with the rotation of the operating shaft 80.

The connecting member 70 is used to transmit the rotation of the operating shaft 80 to the large-diameter gear 55 in the gear unit 50 shown on the right side of FIG. This connecting member 70 is not used in the gear unit 50 connected to 60 .

As shown in FIG. 3 , the gear unit 50 includes a pair of gear cases 51 having the same shape and facing each other, a small diameter gear 53 , a transmission gear 54 and a large diameter gear 55 . Incidentally, the small diameter gear 53 and the transmission gear 54 have the same shape, and are only distinguished functionally.

First, the large-diameter gear 55 is rotatably supported by the shaft holes 51m of the gear cases 51 on both sides of the rotating shaft 55a slightly protruding from both ends thereof. A hexagonal hole 55</b>H that can be engaged with the hexagonal shaft 70 a of the connecting member 70 is formed through the large-diameter gear 55 . The number of teeth of the large-diameter gear 55 is larger than the number of teeth of the small-diameter gear 53 and the transmission gear 54 .

The hexagonal hole 55H of the large-diameter gear 55 is sized to pass through the operating shaft 80 shown in FIG. In the first embodiment, as can be understood from FIG. 1, the drive shaft 30 is not inserted into the hexagonal hole 55H of the large-diameter gear 55 in the gear unit 50 on the left side of the drawing, and the gear on the right side of the drawing is not inserted. There is only a case where the operating shaft 80 passes through the hexagonal hole 55H of the large-diameter gear 55 in the unit 50 . However, gear units 50A and 50B used in a second embodiment, which will be described later with reference to FIG. (same diameter and same shape as the operating shaft 80 and the driving shaft 30) can be penetrated in a non-engaging manner.

The transmission gear 54 meshes with both the large-diameter gear 55 and the small-diameter gear 53, and the rotating shafts 54a projecting slightly from both ends of the transmission gear 54 are inserted into the shaft holes 51j of one gear case 51 and the shaft holes 51j of the other gear case 51, respectively. rotatably pivoted; Since the pair of gear cases 51 have the same shape and can be fitted opposite each other, each gear case 51 is formed with a shaft hole 51j and a shaft hole 51k in the vertical direction in the figure.

The small-diameter gear 53 has the same shape as the transmission gear 54 , and a rotating shaft 53 a slightly protruding from both ends thereof is rotatably supported in shaft holes 51 i of both gear cases 51 . A hexagonal hole 53H that can be engaged with the drive shaft 30 is formed through the small diameter gear 53 (see FIG. 2).

The pair of gear cases 51 house the small-diameter gear 53, the transmission gear 54, and the large-diameter gear 55 with the transmission gear 54 meshing with both the large-diameter gear 55 and the small-diameter gear 53. It has a box shape. For this facing fitting, the pair of gear cases 51 are formed as shown in the figure, with a fitting claw portion 51a and a fitting receiving portion 51b, and a fitting claw portion 51e and a fitting receiving portion 51f. ing. In addition, the pair of gear cases 51 has a round convex portion 51c and a round concave portion 51d, and a flat convex portion 51g and a flat concave portion 51h, which are engaged with each other, in order to prevent misalignment when they are engaged with each other. is formed to

As a result, the gear unit 50 rotatably supports the small-diameter gear 53, the transmission gear 54, and the large-diameter gear 55 in a state in which the transmission gear 54 meshes with both the large-diameter gear 55 and the small-diameter gear 53. can be done. In addition, the pair of gear cases 51 having the same shape and facing each other is used, which contributes to cost reduction by communalizing members and eliminating the need for extra mounting screws and the like for the casing.

In addition, as will be described later with reference to FIG. 51p is formed.

Due to the gear unit 50 having such a structure, in the gear unit 50 shown on the right side of FIG. It operates as speed increasing means for speeding up the rotation of the combined operation shaft 80 at the predetermined transmission ratio (gear ratio in this example) and transmitting it to the drive shaft 30 . On the other hand, in the gear unit 50 connected to the constant load unit 60 shown on the left side of FIG. Regarding the accelerated rotation of the drive shaft 30, the rotation of the drive shaft 30 is controlled by a predetermined transmission ratio separately from the engagement shaft (engagement shaft 63 shown in FIG. 5) of the constant load unit 60 that engages with the drive shaft 30. (Gear ratio in this example) and operates as a reduction means for transmitting to the transmission shaft of the constant load unit 60 (the transmission shaft 65 shown in FIG. 5).

(Constant load unit)
FIG. 4 is a perspective view showing a schematic configuration of the constant load unit 60 according to this embodiment. FIG. 5 is an exploded perspective view showing a schematic configuration of the constant load unit 60 according to this embodiment.

First, as shown in FIG. 4, the constant load unit 60 according to the present embodiment has a box shape and is connected to the gear unit 50 on the left side of FIG. It functions as constant load means for imparting rotational torque to the drive shaft 30 so that the load applied to the bottom rail 11 is kept within a predetermined load (constant load range).

More specifically, referring to FIG. 5 , the constant load unit 60 includes a pair of spring cases 61 having the same shape and facing each other, an engagement shaft 63 , a constant load spring 64 and a transmission shaft 65 .

First, the engaging shaft 63 is rotatably supported by the shaft holes 61f of both spring cases 61 at the rotating shafts 63a slightly protruding from both ends thereof. A round hole 63</b>H is formed through the engagement shaft 63 so as to be relatively rotatable with respect to the drive shaft 30 . One end 64a of the constant load spring 64 is fixed to a flat portion having one screw receiver 63b provided on a part of the peripheral surface of the engaging shaft 63 (not shown on the one end 64a for the screw receiver 63b). It is fastened with a mounting screw (not shown) through a screw hole). The one end 64a of the constant load spring 64 may be held by overturning around the engaging shaft 63, and may be fixed without using a mounting screw. The engagement shaft 63 can wind the constant load spring 64 or unwind it in accordance with the rotation of the drive shaft 30. Flanges are formed on both ends of the peripheral surface as shown.

The transmission shaft 65 is rotatably supported by the shaft holes 61g of both spring cases 61 at the rotating shafts 65a slightly projecting from both ends thereof. A hexagonal hole 65d is formed at one end of the transmission shaft 65, and a hexagonal shaft 65b projecting outward from the spring case 61 is formed at the other end (see FIG. 6). A circular through hole 65H communicates with the hexagonal hole 65d. As shown in FIG. 6, this hexagonal shaft 65b can be engaged with the hexagonal hole 55H of the large-diameter gear 55 in the gear unit 50, and when the constant load unit 60 and the gear unit 50 are connected, , the rotation of the large-diameter gear 55 of the gear unit 50 is transmitted to the transmission shaft 65 of the constant load unit 60 .

In addition, the other end 64b of the constant load spring 64 is fixed to a flat portion having two screw holes 65c provided on a part of the peripheral surface of the transmission shaft 65 (the other end 64b is attached to the two screw receivers 65c). It is fastened with the mounting screw 62 through the screw hole 64c on 64b). The transmission shaft 65 can wind and unwind the constant load spring 64 according to the rotation of the drive shaft 30. Flanges are formed at the upper ends as shown.

A pair of spring cases 61 accommodate the engagement shaft 63, the constant load spring 64, and the transmission shaft 65 in a state in which the constant load spring 64 can be wound around the engagement shaft 63 or the transmission shaft 65, and are attached to each other. It comes to have a box shape by making it face and fit. For this facing fitting, the pair of spring cases 61 are formed with fitting claws 61a and fitting-receiving portions 61c of fitting-receiving pieces 61b that are fitted to each other. Further, the pair of spring cases 61 are formed with corner protrusions 61d and corner recesses 61e that are engaged with each other in order to prevent misalignment when they are mated to face each other.

As a result, the constant load generating unit 60 supports the engaging shaft 63 and the transmission shaft 65 so as to be rotatable without backlash in a state where the constant load generating spring 64 can be wound around the engaging shaft 63 or the transmission shaft 65. can be made In addition, by forming a pair of spring cases 61 having the same shape and facing each other, it is possible to share members and eliminate extra mounting screws for the casing, contributing to cost reduction.

One end 64a of the constant load spring 64 is fixed on the peripheral surface of the engagement shaft 63 so as to intersect between the engagement shaft 63 and the transmission shaft 65, and the other end is fixed to the circumference of the engagement shaft 63. 64b is fixed on the peripheral surface of the transmission shaft 65. As shown in FIG.

When the constant load spring 64 is wound around the transmission shaft 65 , it is unwound from the engagement shaft 63 , and when it is unwound from the transmission shaft 65 , it is wound around the engagement shaft 63 . , the engagement shaft 63 and the transmission shaft 65 rotate in the same direction, and the rotation speed of the engagement shaft 63 is faster than the rotation speed of the transmission shaft 65 . Therefore, the outer diameter of the engagement shaft 63 around which the constant load spring 64 is wound is made smaller than the outer diameter of the transmission shaft 65 so as to offset the difference in rotational speed between the engagement shaft 63 and the transmission shaft 65 .

That is, the pair of spring cases 61 of the constant load unit 60 has, as shown in FIG. is formed, and when the constant load unit 60 and the gear unit 50 are connected, the hexagonal shaft 65b projecting outward from the spring case 61 of the constant load unit 60 can be engaged with the hexagonal hole 55H of the gear unit 50. Thus, when the large-diameter gear 55 of the gear unit 50 rotates, the transmission shaft 65 of the constant load unit 60 rotates together.

The constant load unit 60 is connected to the drive shaft 30 and a transmission shaft 65 that reduces the rotation of the drive shaft 30 at a predetermined transmission ratio (gear ratio in this example) by the gear unit 50 on the left side of FIG. The mating engagement shaft 63 is connected by a constant load spring 64 so that constant rotational torque is applied to the drive shaft 30 regardless of the vertical position of the bottom rail 11 .

For example, as shown in FIG. 7A, each winding unit 40 operates a shaft cover 43 (details of which will be described later) that functions as a brake mechanism, and lifts the lifting cord 13 wound around the winding shaft 41. is rewound to lower the screen 10 together with the bottom rail 11 from the upper limit Hmax to the lower limit Hmin. In this case, as shown in FIG. 7(b), without the constant load unit 60 configured as described above, the weight of the screen 10 decreases linearly. The operating load of the handle 12) changes substantially linearly from La to Lb, and the upward operation of the handle 12 becomes particularly heavy.

Therefore, the constant load unit 60 configured as described above is provided, and as shown in FIG. Thus, a substantially constant rotational torque is applied to the drive shaft 30 . That is, in FIG. 7(c), the constant load range (constant load width) centered on the load Lc is smaller than La−Lb, and preferably the constant load spring 64 is optimized so that the upper limit Hmax to the lower limit Hmin, a uniform load Lc can be realized. Further, the load Lc can substantially reduce the operation load by designing to satisfy La>Lc≧Lb, but more preferably by designing to satisfy La>Lb>Lc, It is also possible to achieve a constant load over the entire range from the upper limit Hmax to the lower limit Hmin and to achieve a low load.

In this way, the constant load unit 60 can maintain the drive shaft 30 engaged with the engagement shaft 63 regardless of the elevation state of the screen 10 caused by winding or rewinding the lifting cord 13 by the winding shaft 41. It is configured to apply a substantially constant rotational torque within a predetermined load (constant load range), and the operation load of the handle 12 is substantially constant and uniform throughout the entire lifting and lowering range of the screen 10, thereby enabling operation. It is possible to reduce the load.

By the way, considering the case where the weight of the shielding material is different for each shielding device (in this example, the case where the weight of the screen 10 is different for each pleated screen), a plurality of constant load units 60 can be used. In particular, as shown in FIG. 6, the pair of spring cases 61 of the constant load unit 60 are formed with fitting receiving portions 61i that enable connection with the additional constant load unit 60. As shown in FIG. In this case, for example, as shown in FIG. 8A, a plurality of constant load units 60 can be connected. By fitting the fitting claw portion 61h and the fitting receiving portion 61i of the other constant load unit 60, they can be connected, and in addition, the gear unit 50 can be connected as described above.

When a plurality of constant load units 60 are connected, as will be understood from FIG. It can be engaged with the hexagonal hole 65d. As a result, even if the weight of the shielding material differs for each shielding device, the rotational torque applied to the drive shaft 30 can be adjusted by changing the number of constant load units 60 installed.

Further, depending on the application having a plurality of drive shafts (not shown), the gear unit 50 can be connected between the two constant load units 60 as shown in FIG. 8(b). In this case, the hexagonal shaft 65b protruding outward from the spring case 61 of one constant load unit 60 can be engaged with the hexagonal hole 55H of the gear unit 50 as shown in FIG.

In the constant load unit 60 shown in FIGS. 5 and 6, the round through hole 65H is formed to communicate with the hexagonal hole 65d. When used as constant load units 60A and 60B in a second embodiment described later with reference to , the drive shafts 30A and 30B (same diameter and same shape as the operation shaft 80 and the drive shaft 30) can pass through in a non-engaging manner. Note that

(Take-up unit with shaft cover that functions as a braking mechanism)
9A and 9B are a front view and a side view, respectively, showing a schematic configuration of the winding unit 40 according to this embodiment, and FIG. 10 is a brake mechanism of the winding unit 40 according to this embodiment. 2 is a perspective view showing a schematic configuration of a shaft cover 43 functioning as a . FIG. 11(a) is a plan view showing a schematic configuration of the winding unit 40 according to the present embodiment, and FIGS. FIG. 4 is a cross-sectional view illustrating an example;

As shown in FIG. 9 , the winding unit 40 includes a winding shaft 41 , a shaft case 42 and a shaft cover 43 . The shaft case 42 has a box shape with an open top. The winding shaft 41 has a hexagonal shaft hole 41 a through which the drive shaft 30 is engaged. supported. The winding shaft 41 is capable of winding or rewinding the upper end of the lift cord 13 which is attached to the bottom rail 11 at the lower end and passes through the screen 10 by the rotation of the drive shaft 30 .

The shaft case 42 includes a pair of left and right unit side walls 42a extending upward. Each unit side wall 42a is provided with a locking hole 42b passing through the unit side wall 42a.

In addition, the shaft cover 43 is arranged at the base end of the winding shaft 41 and prevents the bottom rail 11 from falling by its own weight by providing resistance to the movement of the lifting cord 13 wound on the winding shaft 41 . It functions as a brake mechanism that

More specifically, the shaft cover 43 has a shape that covers the base end of the winding shaft 41 and part of the drive shaft 30 inserted through the winding shaft 41 . The shaft cover 43 includes locking protrusions 43b and insertion protrusions 43c as protrusions that can be engaged with the locking holes 42b. The shaft cover 43 is attached to the shaft case 42 by first inserting the insertion projection 43c into the locking hole 42b and then fitting the locking projection 43b into another locking hole 42b.

As shown in FIG. 10 , the shaft cover 43 includes a plate-shaped cover body 44 that covers the base end of the winding shaft 41 . The cover body 44 has a covering surface 44</b>S, which is a curved surface that follows the outer peripheral surface of the winding shaft 41 and protrudes upward, at a radially outer position of the winding shaft 41 .

Both lateral end walls of the shaft cover 43 are provided with brake portions 45 protruding outside the shaft cover 43 from the respective end walls. Each brake portion 45 is a pair in front and rear on each end surface of the shaft cover 43 . Each brake portion 45 is located above the covering surface 44S and outside the covering surface 44S in the radial direction of the winding shaft 41 . The reason why a pair of brake portions 45 are formed at the front and rear is that two take-up shafts 41A and 41B, which will be described later, can be supported by the cover body 44. In the first embodiment, one It may be provided only on the upper part of the winding shaft 41 . In addition, the shaft cover 43 has a rotationally symmetrical shape that is symmetrical in the left-right direction and the front-rear direction with respect to its center, thereby improving the assembling property with respect to the shaft case 42 .

Each brake portion 45 is hooked with the lifting cord 13 so as to provide resistance to the movement of the lifting cord 13 wound around the winding shaft 41 (described later with reference to FIG. 11).

At the tip of each brake portion 45, a retainer portion 43a is formed to prevent the lift cord 13 hooked on the brake portion 45 from coming off. Friction between the lifting cord 13 and the retaining portion 43a also imparts resistance to the movement of the lifting cord 13. As shown in FIG.

When one winding shaft 41 is supported by the winding unit 40 as shown in FIG. is hung, and as shown in the AA' cross section of the first example shown in FIG. As shown in the AA′ cross section of the second example shown in FIG.

11(b) and (c) show the head box cover 21, which is omitted in FIG. 11(a). The head box cover 21 covers the drive shaft 30 , the winding unit 40 , the gear unit 50 and the constant load unit 60 over the entire lateral direction of the head box 20 . However, the head box cover 21 does not have to cover the entire left-right direction of the head box 20 , and may cover at least the brake portion 45 .

In the first example shown in FIG. 11(b), the lifting cord 13 attached to the brake portion 45 hangs down through the insertion hole 42H passing through the bottom wall of the shaft case 42 on the front side of the center of the winding shaft 41. For example, it penetrates the screen 10 and is attached to the bottom rail 11, and receives not only the load of the bottom rail 11 but also the load of the folded screen 10. - 特許庁At this time, the lift cord 13 is pulled downward from the brake portion 45 and bent to follow the upper surface of the brake portion 45 . Resistance is applied to the movement of the lifting cord 13 by the brake portion 45 that bends the lifting cord 13 in this way.

In the second example shown in FIG. 11(c), the lifting cord 13 hung on the brake portion 45 hangs down through the insertion hole 42H that penetrates the bottom wall of the shaft case 42 on the rear side of the center of the winding shaft 41. For example, it penetrates the screen 10 and is attached to the bottom rail 11. In this case as well, not only the load of the bottom rail 11 but also the load of the folded screen 10 is received. At this time, the lift cord 13 is pulled downward from the brake portion 45 and bent to follow the upper surface of the brake portion 45 . In this way, the lifting cord 13 suspended from the rear side of the winding shaft 41 is also bent by the brake portion 45 to apply resistance to the movement of the lifting cord 13 .

Since the head box cover 21 is positioned above the brake portion 45, the lift cord 13 is prevented from being detached from the brake portion 45 when the lift cord 13 is lifted upward (outside in the radial direction) from the brake portion 45.

In this embodiment shown in FIG. 1, a plurality of (two in this example) winding units 40 are provided with shaft covers 43 functioning as brake mechanisms. Although an example in which resistance is applied to the movement of the lifting cords 13 via the corresponding lifting cords 13 is shown, it is not necessary to limit to this form.

For example, in a plurality of (two in this example) winding units 40, any one or more (including all) lifting cords 13 can be pulled without passing through the shaft cover 43 (without activating the brake mechanism). , can constitute a pleated screen. Therefore, the braking setting of the braking mechanism can be finely adjusted for the pleated screen as a whole.

In other words, depending on the weight of the fabric used as the screen 10, the size of the pleated screen, etc., a predetermined resistance is indirectly applied to the movement of the lifting cord 13 by the function of the constant load unit 60 without providing a brake mechanism. It can be in the form of

That is, the constant load unit 60 determines the weight of the fabric used as the screen 10, the size of the pleated screen, the presence or absence of a brake mechanism that provides resistance to the movement of the lifting cords 13, or the overall braking load of the brake mechanism. Accordingly, it can be set to fall within a predetermined constant load range in order to reduce the operation load. When the brake mechanism is used, instead of using the brake mechanism to prevent the bottom rail 11 and the screen 10 from falling due to their own weight, or in combination with this, the function of the constant load unit 60 (the operation load is It is possible to finely adjust and set the braking load applied to the rotational torque so as to reduce the operation load.

(Auxiliary operating device)
By the action of the constant load unit 60 described above, the load applied to the bottom rail 11 in the entire lifting range of the screen 10 is configured to fall within a predetermined load (constant load range) in which the load is substantially constant, thereby allowing the user to The operation load in the lifting operation by the handle 12 is reduced, and the lifting and lowering of the screen 10 is smoothed and the operability is improved. However, the lifting operation by the handle 12 has room for improvement in terms of further operability at the top that is out of reach and at the bottom that is difficult to operate. An operating device 15 is provided.

FIGS. 12(a) and 12(b) are perspective views showing schematic configurations of an example and another example of the auxiliary operation device 15 according to the present embodiment, respectively.

The auxiliary operating device 15 illustrated in FIGS. 12(a) and 12(b) comprises an operation cord 18, an operation pulley 17 on which the operation cord 18 is mounted, and a pulley case 16 that supports and accommodates the operation pulley 17. As shown in FIG. 1, it is arranged at one end (right end in this example) of the head box 20 via the operation box 90 . In this example, the operation box 90 is configured to have a simple supporting function, so the pulley case 16 may be fitted to one end of the head box 20 without using the operation box 90 .

In the embodiment shown in FIG. 12(a), the operation cord 18 is composed of a ball chain with two hanging ends with both ends disconnected. An indoor grip 19F and an outdoor grip 19R are attached to each end of the operation cord 18, respectively. Incidentally, the operation cord 18 may be configured by a cord-like cord.

On the other hand, as another example shown in FIG. 12(b), the operation cord 18 may be composed of an endless ball chain or a cord-like cord with a safety chain 18L that detaches with a predetermined pulling force or more. However, for the reasons described later, the operation cord 18 having two hanging ends with both ends unconnected as shown in FIG. For example, there is an advantage that safety is improved because the head of an infant or the like is certainly not caught, and the operation load can be reduced because the indoor grip 19F and the outdoor grip 19R can be attached respectively. It has the advantage of being able to

As shown in FIG. 13, the operating pulley 17 is configured to rotate when the operating cord 18 is pulled, and one end of the operating shaft 80 is engaged with the center of the operating pulley 17 so as not to rotate relative to it. The other end of the operating shaft 80 is inserted into and engaged with the gear unit 50 on the right side of FIG. (Gear ratio in this example) and transmitted to the drive shaft 30 .

Therefore, when the operation cord 18 is pulled, the operation pulley 17 rotates, and the rotation of the operation pulley 17 rotates the operation shaft 80 integrally. The speed is increased and transmitted to the drive shaft 30 .

Therefore, by rotating the operation pulley 17 forward and backward by pulling the operation cord 18, the drive shaft 30 is rotated forward and backward, and the screen 10 can be raised and lowered while utilizing the action of the constant load unit 60.

For example, during the downward operation shown in FIG. 14(a), the stroke from the top to the bottom of the screen 10 is L1. In other words, the operation by the handle 12 can only be released as far as the hand can reach).

Therefore, with the auxiliary operating device 15 shown in FIG. The stroke L1 from the top to the bottom of the screen 10 can be shortened to a stroke L2 as the range of motion of the indoor grip 19F (or the range of motion of the outdoor grip 19R).

Further, in the case of the auxiliary operating device 15 shown in FIG. 13, the operation cords 18 are formed so that the two ends are unconnected and suspended, so that when the downward operation shown in FIG. It can be understood at a glance that the grip 19R should be operated. Furthermore, safety is improved because, for example, the head of an infant or the like is certainly prevented from being caught.

Further, since the indoor grip 19F and the outdoor grip 19R can be attached to both ends of the operation cord 18, it is easy to grasp and the operation load can be reduced.

14(b), the stroke from the top to the bottom of the screen 10 is L1, and the lifting operation by the handle 12 is difficult to lift the bottom.

Therefore, with the auxiliary operating device 15 shown in FIG. The range of motion of the indoor grip 19F (or the range of motion of the outdoor grip 19R) can be shortened to a stroke L2 from the stroke L1 from the top to the bottom.

Further, in the case of the auxiliary operation device 15 shown in FIG. 13, the operation cords 18 are made so that the two ends are unconnected and hang down, so that when it is desired to perform the upward operation shown in FIG. It can be understood at a glance that the grip 19F should be operated. Furthermore, safety is improved because, for example, the head of an infant or the like is certainly prevented from being caught.

Further, since the indoor grip 19F and the outdoor grip 19R can be attached to both ends of the operation cord 18, it is easy to grasp and the operation load can be reduced.

Therefore, according to the present embodiment, the load of the drive shaft 30 for raising and lowering the screen 10 is set to a constant load, and the operability during the raising and lowering operation by gripping the bottom rail 11 (at the time of the raising and lowering operation with the handle 12) is improved. In addition, it is possible to further improve the operability at the top that is out of reach and the bottom that is difficult to operate, and more preferably, it is possible to improve safety and reduce the operation load.

[Second embodiment]
(overall structure)
15(a) and 15(b) are respectively a plan view and a front view showing a schematic configuration of a pleated screen as an example of a shielding device according to a second embodiment of the present invention. As shown in FIG. 15 , the pleated screen of this embodiment includes a lower screen 10A and an upper screen 10B, which are examples of shielding materials, and a headbox 20 .

The upper screen 10B is bent vertically in a zigzag shape from the headbox 20. - 特許庁The upper end of the upper screen 10B is connected to the headbox 20, and the lower end of the upper screen 10B is connected to the intermediate rail 11B. The lower screen 10A is bent vertically in a zigzag shape from the intermediate rail 11B. The upper end of the lower screen 10A is connected to the intermediate rail 11B, and the lower end of the lower screen 10A is connected to the bottom rail 11A. A handle 12A is attached to the center of the bottom rail 11A in the left-right direction, and a handle 12B is attached to the center of the intermediate rail 11B in the left-right direction. The upper screen 10B can be moved up and down by the user by moving the handle 12B up and down. The lower screen 10A can be raised and lowered by the user by raising and lowering the handle 12A.

Within the headbox 20, the drive shaft 30A, in this example each winding shaft 41A in the two winding units 40, two gear units 50A, the constant load unit 60A, the operating shaft 80A, and the auxiliary operating device 15A are , for lifting and lowering the lower screen 10A and the bottom rail 11A.

On the other hand, in the head box 20, there are a drive shaft 30B, two winding shafts 41B in the two winding units 40 in this example, two gear units 50B, a constant load unit 60B, an operating shaft 80B, and an auxiliary operating device 15B. , an interlocking operation shaft 81B, a driving gear 91, and a driven gear 92 are provided for raising and lowering the upper screen 10B and the intermediate rail 11B.

The driving shaft 30A has a polygonal columnar shape (hexagonal columnar shape in this example) extending in the left-right direction, and is engaged with the winding shaft 41A of each winding unit 40, each gear unit 50A, and the constant load unit 60A. Although it extends almost entirely in the left-right direction inside the head box 20, it is not directly engaged with the auxiliary operating device 15A having the same structure as that of the first embodiment.

The drive shaft 30B has a polygonal columnar shape (hexagonal columnar shape in this example) extending in the left-right direction, and is engaged with the winding shaft 41B of each winding unit 40, each gear unit 50B, and the constant load unit 60B. Although it extends almost entirely in the left-right direction in the head box 20, it is not directly engaged with the auxiliary operation device 15B having the same structure as that of the first embodiment.

The drive shafts 30A and 30B are arranged parallel to each other and have the same structure as the drive shaft 30 of the first embodiment.

Each winding unit 40 includes a pair of two winding shafts 41A and 41B in front and rear, a shaft case 42, and a shaft cover 43. The winding shaft 41, the shaft case 42, and It has the same structure as the shaft cover 43 .

The winding shafts 41A and 41B have a truncated cone shape that rotates integrally with the drive shafts 30A and 30B, respectively, and are rotatably supported on the shaft case 42 . The winding shafts 41A and 41B are attached to the bottom rail 11A and the intermediate rail 11B at their lower ends by rotation of the drive shafts 30A and 30B, respectively, so that the upper ends of the lifting cords 13A and 13B can be wound or rewound. It's becoming In addition, the shaft cover 43 is arranged at the base ends of the winding shafts 41A and 41B in each winding unit 40, and resists movement of the lifting cords 13A and 13B wound around the winding shafts 41A and 41B. , the bottom rail 11A and the intermediate rail 11B function as brake mechanisms that prevent the fall of their own weight.

Each gear unit 50A, 50B has the same structure as the gear unit 50 of the first embodiment.

One of the two gear units 50A (left side in the drawing) is connected to the constant load unit 60A, and the engagement shaft of the constant load unit 60A (the engagement shaft shown in FIG. 5) is engaged with the drive shaft 30A. 63), the rotation of the drive shaft 30A is decelerated at a predetermined transmission ratio (gear ratio in this example) and is operated as a reduction means for transmitting it to the transmission shaft (transmission shaft 65 shown in FIG. 5) of the constant load unit 60A. On the other hand, the other (right side in the figure) transmits the rotation of the operating shaft 80A inserted through the connecting member 70A (same structure as the connecting member 70 shown in FIG. 2) to the predetermined transmission ratio (gear ratio in this example). It operates as speed increasing means for increasing the speed and transmitting it to the drive shaft 30A.

One of the two gear units 50B (on the right in the figure) is connected to the constant load unit 60B, and the engagement shaft of the constant load unit 60B (the engagement shaft shown in FIG. 5) is engaged with the drive shaft 30B. 63), the rotation of the drive shaft 30B is decelerated at a predetermined transmission ratio (gear ratio in this example) and is operated as a deceleration means for transmitting it to the transmission shaft (transmission shaft 65 shown in FIG. 5) of the constant load unit 60B. The other (left side in the drawing) rotates the interlocking operation shaft 81B inserted through and engaged with the connecting member 70B (same structure as the connecting member 70 shown in FIG. 2) to the predetermined transmission ratio (gear ratio in this example). ) to increase the speed and transmit it to the drive shaft 30B.

The constant load units 60A and 60B each have the same structure as the constant load unit 60 of the first embodiment.

The constant load unit 60A is driven regardless of the elevation state of the lower screen 10A so that the operating load of the handle 12A is kept within a predetermined load (constant load range) in which the operating load of the handle 12A is substantially constant over the entire elevation range of the lower screen 10A. It functions as a constant load means that imparts a substantially constant rotational torque to the shaft 30A.

The constant load unit 60B is driven regardless of the elevation state of the upper screen 10B so that the operating load of the handle 12B is substantially constant within a predetermined load (constant load range) in the entire elevation range of the upper screen 10B. It functions as a constant load means that imparts a substantially constant rotational torque to the shaft 30B.

The auxiliary operating devices 15A and 15B each have the same structure as the auxiliary operating device 15 of the first embodiment.

The auxiliary operation device 15A includes an operation cord 18A, an operation pulley 17A on which the operation cord 18A is attached, and a pulley case 16A that rotatably supports and accommodates the operation pulley 17A. is arranged at one end (right end in this example) of the . In particular, as in the first embodiment, two operation cords 18A are formed by unconnecting both ends, and an indoor grip 19AF and an outdoor grip 19AR are attached to each end of the operation cord 18A. is preferred. Since the operation box 90A has a simple supporting function in this example, the pulley case 16A may be fitted to one end of the head box 20 without using the operation box 90A.

The auxiliary operation device 15B includes an operation cord 18B, an operation pulley 17B on which the operation cord 18B is attached, and a pulley case 16B that rotatably supports and houses the operation pulley 17B. is arranged on the other end (the left end in this example) of the . In particular, as in the first embodiment, two operating cords 18B are formed by unconnecting both ends, and an indoor grip 19BF and an outdoor grip 19BR are attached to each end of the operating cord 18B. is preferred. In this example, the operation box 90B has a simple supporting function, so the pulley case 16B may be fitted to one end of the head box 20 without using the operation box 90B. However, in this example, a drive gear 91 that rotates integrally with the operation shaft 80B and a driven gear 92 that meshes with the drive gear 91 so as to rotate at a constant speed are arranged in the operation box 90B, and rotate integrally with the driven gear 92. The interlocking operation shaft 81B is inserted through and engaged with the other gear unit 50B (left side in the drawing) of the two gear units 50B via the connecting member 70B.

As described above with reference to FIGS. 5 and 6, the gear units 50A and 50B used in the second embodiment shown in FIG. 15 have the same shape as the gear unit 50 of the first embodiment. The drive shafts 30A and 30B can pass through the hexagonal hole 55H in a non-engaging manner. Therefore, as shown in FIG. 15, in the head box 20, a gear unit 50A and a constant load unit 60A for raising and lowering the lower screen 10A and the bottom rail 11A, and a gear unit 60A for raising and lowering the upper screen 10B and the intermediate rail 11B are provided. The gear unit 50B and the constant load unit 60B can be arranged in a line, and the gear unit 50 and the constant load unit 60 shown in FIG. 6 are applicable to various shielding devices. And it is excellent in versatility, and can realize high capacity.

By rotating the operation pulley 17A forward and backward by pulling the operation cord 18A, the drive shaft 30A is rotated forward and backward, and the lower screen 10A can be raised and lowered while utilizing the action of the constant load unit 60A.

Further, by rotating the operating pulley 17B forward and backward by pulling the operation cord 18B, the drive shaft 30B is rotated forward and backward, and the upper screen 10B can be raised and lowered while utilizing the action of the constant load unit 60B.

That is, in the head box 20, the drive shaft 30A, the winding shaft 41A, the gear unit 50A, the constant load unit 60A, the operating shaft 80A, and the auxiliary operating device 15A are used for raising and lowering the lower screen 10A and the bottom rail 11A. , the operation is substantially the same as that of the drive shaft 30, the winding shaft 41, the gear unit 50, the constant load unit 60, the operating shaft 80, and the auxiliary operating device 15 in the first embodiment. .

In the head box 20, the drive shaft 30B, the winding shaft 41B, the gear unit 50B, the constant load unit 60B, the operating shaft 80B, and the auxiliary operating device 15B are used for lifting and lowering the upper screen 10B and the intermediate rail 11B. , the operation is substantially the same as that of the drive shaft 30, the winding shaft 41, the gear unit 50, the constant load unit 60, the operating shaft 80, and the auxiliary operating device 15 in the first embodiment. . However, in this example, the rotation of the operation shaft 80B, which is the output shaft of the auxiliary operation device 15B, is transmitted to the interlocking operation shaft 81B via the driving gear 91 and the driven gear 92, so that the operation inside the room is controlled. Pulling the cord 18A lifts the lower screen 10A, and pulling the cord 18B on the indoor side lifts the upper screen 10B.

Each winding unit 40 operates in the same manner as in the first embodiment in that it supports a pair of two winding shafts 41A and 41B in the front and rear directions. do.

As shown in FIG. 16(a), two winding shafts 41A and 41B are supported by the winding unit 40, and the brake portion 45 of the shaft cover 43 is provided on the base ends of the winding shafts 41A and 41B. Lifting cords 13A and 13B are hung, and as shown in the AA' cross section of the first example shown in FIG. Hanging the lifting cords 13A and 13B from the rear side of the central axis, and as shown in the AA' cross section of the second example shown in FIG. The lifting cords 13A and 13B can be suspended from the top.

16(b) and (c) show the head box cover 21, which is omitted in FIG. 16(a). The head box cover 21 covers the drive shafts 30A, 30B, the winding unit 40, the gear units 50A, 50B, the constant load units 60A, 60B, etc. over the entire lateral direction of the head box 20. . However, the head box cover 21 does not have to cover the entire left-right direction of the head box 20 , and may cover at least the brake portion 45 .

In the first example shown in FIG. 16(b), the lifting cords 13A and 13B attached to the respective brake portions 45 are located forward of the center of the winding shaft 41A and rearward of the center of the winding shaft 41B. For example, the lifting cord 13A passes through the upper and lower screens 10B and 10A, the lifting cord 13B passes through the upper screen 10B, and extends through the bottom rail 11A and the bottom rail 11A. It is attached to the intermediate rail 11B. Each lifting cord 13A, 13B receives not only the load of the bottom rail 11A and the intermediate rail 11B, but also the load of the folded lower screen 10A and the upper screen 10B. At this time, the lifting cords 13A and 13B are pulled downward from the braking portions 45 and bent to follow the upper surfaces of the braking portions 45. After that, the lifting cords 13A are wound from the front side of the winding shaft 41A. The lifting cord 13B starts to be wound from the rear side of the winding shaft 41B. Resistance is applied to the movement of the lifting cords 13A and 13B by the brake portions 45 that bend the lifting cords 13A and 13B in this way.

In the second example shown in FIG. 16(c), the lifting cords 13A and 13B attached to the brake portions 45 pass through the bottom wall of the shaft case 42 behind the center of the winding shaft 41A. The elevating cord 13A, for example, passes through the upper and lower screens 10B and 10A, and the elevating cord 13B passes through the upper screen 10B and is attached to the bottom rail 11A and the intermediate rail 11B, respectively. Each lifting cord 13A, 13B receives not only the load of the bottom rail 11A and the intermediate rail 11B, but also the load of the folded lower screen 10A and the upper screen 10B. At this time, the lift cords 13A and 13B are pulled downward from the brake portions 45 and bent to follow the upper surfaces of the brake portions 45. After that, the lift cords 13A are pulled from the rear side of the winding shaft 41A. Winding starts, and the lifting cord 13B starts winding from the front side of the winding shaft 41B. Resistance is applied to the movement of the lifting cords 13A and 13B by the brake portions 45 that bend the lifting cords 13A and 13B in this way.

As described above, in the present embodiment, the operation pulleys 17A and 17B are rotated forward and backward by pulling the operation cords 18A and 18B, thereby rotating the drive shafts 30A and 30B forward and backward, The lower screen 10A and the upper screen 10B can be moved up and down while making use of the action of 60B.

The operation of lifting and lowering the lower screen 10A by pulling the operation cord 18A is substantially the same as in the first embodiment, and the pulling operation of the operation cord 18B is also the same as in the first embodiment. The operation of moving the upper screen 10B up and down by pulling the operation cord 18B will be described with reference to FIG.

For example, when the upper screen 10B is lowered as shown in FIG. 17A, the stroke from the top to the bottom of the upper screen 10B is L3. (In other words, the handle 12B can only be released within reach).

Therefore, if the auxiliary operation device 15B is constructed in the same manner as that shown in FIG. 13 in the first embodiment, the lowering operation by the handle 12B can be performed by pulling the operation cord 18B even at the top, which is out of reach of the hands. In addition, due to the action of the gear unit 50B, the range of motion of the indoor grip 19BF (or the range of motion of the outdoor grip 19BR) is shortened to a stroke L4 with respect to the stroke L3 from the top to the bottom of the upper screen 10B. can be made

In addition, in the case of the auxiliary operation device 15B configured in the same manner as the one shown in FIG. 13 in the first embodiment, the operation cords 18B having two hanging cords 18B with both ends unconnected can be used as shown in FIG. 17(a). It can be understood at a glance that the outdoor side grip 19BR should be operated when the lowering operation shown is desired. Furthermore, safety is improved because, for example, the head of an infant or the like is certainly prevented from being caught.

Further, since the indoor grip 19BF and the outdoor grip 19BR can be attached to both ends of the operation cord 18B, it is easy to grasp and the operation load can be reduced.

14(b), the stroke from the top to the bottom of the upper screen 10B is L3, and it is difficult to lift the bottom by the handle 12B.

Therefore, if the auxiliary operating device 15B is constructed in the same manner as the one shown in FIG. 13 in the first embodiment, it is possible not only to perform the lifting operation by pulling the operation cord 18B even at the lowest part, which is difficult to operate, by the lifting operation using the handle 12B. By the action of the gear unit 50B, the range of motion of the indoor grip 19BF (or the range of motion of the outdoor grip 19BR) can be shortened to a stroke L4 with respect to the stroke L3 from the top to the bottom of the upper screen 10B. can.

In addition, in the case of the auxiliary operation device 15B configured in the same manner as the one shown in FIG. 13 in the first embodiment, the operation cords 18B are configured so that two hanging cords 18B are formed by unconnecting both ends. It can be understood at a glance that the indoor grip 19BF should be operated when the upward operation shown is desired. Furthermore, safety is improved because, for example, the head of an infant or the like is certainly prevented from being caught.

Further, since the indoor grip 19BF and the outdoor grip 19BR can be attached to both ends of the operation cord 18B, it is easy to grasp and the operation load can be reduced.

Therefore, according to the present embodiment, the load of the drive shafts 30B and 30A for moving up and down the upper and lower screens 10B and 10A is set to a constant load, and when the intermediate rail 11B and the bottom rail 11A are gripped for lifting operation (the handle 12B , 12A), it is possible to further improve operability at the top that is out of reach and the bottom that is difficult to operate. It is possible to improve and reduce the operation load.

Further, the gear unit 50 and the constant load unit 60 shown in FIG. 6 are excellent in applicability and versatility to various shielding devices, and can realize high storability.

15(a) and 15(b), the two gear units 50A and the constant load unit 60A, and the two gear units 50B and the constant load unit 60B are optionally arranged in the head box 20. It is possible to change. For example, as in Modified Example 1 shown in FIGS. 18A and 18B, two gear units 50A and constant load unit 60A are arranged on the auxiliary operating device 15A side, and two gear units 50A and 60A are arranged on the auxiliary operating device 15B side. A gear unit 50B and a constant load unit 60B can also be provided. In this case, since two gear units 50A and two gear units 50B having the same function are arranged adjacent to each other, the gear units 50A and 50B can be combined or omitted one by one. be. Also in the first embodiment, one gear unit 50 may be provided, and the one gear unit 50 and the constant load unit 60 may be connected.

If it is not necessary to provide the function of increasing the speed of the rotation of the operating shaft 80A and transmitting it to the drive shaft 30A and the function of increasing the speed of the rotation of the operating shaft 80B and transmitting it to the drive shaft 30B, for example, 19(a) and 19(b), a drive gear 91 that rotates integrally with the operation shaft 80A on the side of the auxiliary operation device 15A, and a driven gear that meshes with the drive gear 91 so as to reverse at a constant speed. 92 may be arranged and the auxiliary operating device 15A and the auxiliary operating device 15B may be provided. In the modification 2 shown in FIG. 19, one gear unit 50 and a constant load unit 60 are connected to each of the drive shafts 30B and 30A in order to make the loads on the drive shafts 30B and 30A constant. . By replacing the driving gear 91 and the driven gear 92 with the gear unit 50, the rotation of the operating shaft 80A can be accelerated and transmitted to the driving shaft 30A when operated by the auxiliary operating device 15A. can be done.

Although the present invention has been described with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the technical idea thereof. For example, in the examples of the respective embodiments described above, preferred examples including all the means for solving the above-described various problems in the conventional technique have been described as representatives, but the present invention is intended to solve the various problems individually. A shielding device according to the invention can be constructed.

For example, in a shielding device equipped with a constant load mechanism that applies constant rotational torque to the drive shaft regardless of the elevation position of the rail, further improvement in operability at the top that is out of reach and at the bottom that is difficult to operate. For the purpose of achieving a constant load, an example of using the constant load unit 60 as the load constant unit has been described, but it is not necessary to be limited to this. For example, an example in which the constant load unit 60 and the gear unit 50 are connected has been described. In good cases, a constant load unit that functions independently without using the gear unit 50 may be configured, or other biasing means such as a motor spring may be used instead of the constant load unit 60 as described above. can do.

Further, as a brake mechanism, it is also possible to apply braking torque to the drive shaft instead of using the shaft cover 43 that provides movement resistance to the lifting cord. Furthermore, the auxiliary operation device is configured to perform manual operation by pulling the operation cord as in the above-described embodiment. A mechanism that enables the shielding material (screen) to move up and down by rotating the rotating operating shaft forward and backward may be used. Such an electrically operated mechanism can be composed of a control device for controlling the drive of the electric motor and a switch for instructing the control device to raise and lower.

In addition, in shielding devices equipped with a constant load means that imparts a constant rotational torque to the drive shaft regardless of the elevation position of the rail, if the purpose is to improve safety, two rails with their ends unconnected may be used. It is particularly effective to have a pendulous operating cord. In particular, from the viewpoint of reducing the operation load, it is more preferable to provide grips at both ends.

Further, although the gear unit 50 using the interlocking gear mechanism has been described as an example of the speed increasing means, the speed increasing means can be constructed using a belt, a wire, or the like.

Moreover, the present invention is not limited to pleated screens, and can be applied to any shielding device that moves a shielding material, such as horizontal blinds and roll screens.

Accordingly, the present invention is not limited to the examples and examples of embodiments described above, but only by the description of the appended claims.

According to the present invention, the load of the drive shaft for raising and lowering the shielding material is set to a constant load, and the operability at the time of raising and lowering operation by gripping the bottom rail (weight member) is improved. It is possible to further improve operability in the upper part and the lowest part where it is difficult to operate, and more preferably, it is possible to improve safety and reduce the operation load, so the use of the shielding device that moves the shielding material useful for

10 screen 10A lower screen 10B upper screen 11, 11A bottom rail 11B intermediate rail 12, 12A, 12B handle 13, 13A, 13B lifting cord 15, 15A, 15B auxiliary operation device 17 operation pulley 18, 18A, 18B operation cord 19F, 19AF , 19AF indoor grip 19R, 19AR, 19AR outdoor grip 20 head box 30, 30A, 30B drive shaft 40 winding unit 41 winding shaft 43 shaft cover 50, 50A, 50B gear unit 60, 60A, 60B constant load unit 70 connecting member 80, 80A, 80B operating shaft 81B interlocking operating shaft 91 driving gear 92 driven gear

Claims (4)

A shielding device that enables lifting operation of a shielding material,
a drive shaft for raising and lowering the shielding material;
a first elevating operation means for operating a rail attached to the lower end of the shielding material to enable the shielding material to be raised and lowered with the rotation of the drive shaft;
means for applying rotational torque to the drive shaft so that the operation load of the first lifting operation means is within a predetermined load in the entire lifting range of the shielding material;
an operating pulley engaged with and connected to the operating shaft to allow the shielding material to move up and down by operating the forward and reverse rotation of the drive shaft via an operating shaft that can be rotated by manual operation using an operating cord; A second lifting operation having an auxiliary operation device that is hung on a pulley and has two ends that are unconnected and hangs down to have a grip attached to it, or has an auxiliary operation device that has an endless operation cord. means and
a speed increasing means for increasing the speed of rotation of the operating shaft at a predetermined transmission ratio and transmitting the rotation to the drive shaft in order to shorten the amount of operation associated with the lifting operation of the shielding material by the second lifting operation means;
with
The shielding device, wherein the rotation of the drive shaft during operation of the first elevation operation means is transmitted to the second elevation operation means. 2. The shielding device according to claim 1, wherein the means for applying rotational torque to said drive shaft comprises a constant load spring or motor spring for applying said rotational torque to said drive shaft. Either or both of a function of preventing the rail from dropping under its own weight and a function of applying a braking load to the rotational torque so as to reduce the operation load as an auxiliary function of the means for applying the rotational torque to the drive shaft. 3. Shielding device according to claim 1 or 2, characterized in that it comprises damping means comprising: The shielding member comprises a plurality of shielding members, one of which is suspended from the headbox of the shielding device to support the first rail, and the other of the plurality of shielding members is suspended from the first rail. suspended to support the second rail;
The braking means comprises one or more winding shafts among a plurality of winding shafts for winding or rewinding lifting cords supporting each of the first rail and the second rail so as to be able to move up and down. is configured to apply resistance to the movement of each corresponding lifting cord,
The first elevation operation means is configured to operate each of the first rail and the second rail to enable elevation of the corresponding shielding material,
The second elevation operation means is configured to operate the forward and reverse rotation of the plurality of drive shafts engaged with the plurality of winding shafts to enable the elevation of each of the plurality of shielding materials,
means for applying rotational torque to the drive shaft is provided for each of the plurality of drive shafts;
The braking means has a function of preventing the first rail and the second rail from dropping due to their own weight, and an auxiliary function of the means for applying rotational torque to the drive shaft so as to reduce an operation load. 4. A shielding device according to claim 3, characterized in that it is arranged to have either or both of the function of imparting a braking load to the torque.

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