JP2019085851A - Shielding device - Google Patents

Abstract

To provide a shielding device capable of making a load of a drive shaft for raising and lowering a shielding material constant and further improving operability, preferably improving safety and reducing operation load.SOLUTION: The shielding device according to the present invention includes a drive shaft 30 for moving a screen 10 up and down, first lifting and lowering operation means (for example, handle 12) for operating a bottom rail 11 to make the lifting possible, a constant load unit 60 for applying a rotational torque to the drive shaft 30 so that the operation load by the handle 12 falls within a predetermined load in the entire elevating range of the screen 10, second lifting and lowering operation means (for example, auxiliary operation device 15) by operation of forward and reverse rotation of the drive shaft 30, and a gear unit 50. The auxiliary operation device 15 is configured by hooking an operation cord 18 with ends on an operation pulley 17 engaged with an operation shaft 80 that rotates in conjunction with the drive shaft 30, and the gear unit 50 engaged with the operating shaft 80 accelerates the rotation of the operating shaft 80 and transmits it to the drive shaft 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shielding apparatus in which the load of a drive shaft for raising and lowering a shielding material is a constant load.

  A pleated screen and a horizontal blind are known as an example of a shielding device which raises and lowers a shielding material. The pleated screen is provided with a screen as a shielding material, and as the screen is lowered, the load of the screen which is lowered from the top of the screen is removed from the lifting cord. The horizontal blind has a plurality of stages of slats as a shielding material, and as the slats of each stage descend, the slats of each stage are supported by the ladder cord in order from the top slat. The rotational torque of the drive shaft for raising and lowering the shielding material decreases as the shielding material lowers, as the shielding material decreases, and conversely, as the shielding material increases, the rotational torque increases as the shielding material increases. . As a result, the change in rotational torque at the drive shaft forces the user driving the drive shaft to adjust its operating force.

  Therefore, in the shielding apparatus for raising and lowering the shielding material, an elevation apparatus using a constant load spring capable of applying a constant rotational torque to the drive shaft is constituted regardless of the elevation of the shielding material, thereby causing the weight of the shielding material. There is disclosed a technique for suppressing the fluctuation of the rotational torque and enabling the automatic raising and lowering of the shielding material (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2000-130052

  As described above, Patent Document 1 discloses a technique of lifting and lowering device using a constant load spring capable of applying a constant rotational torque to a drive shaft regardless of lifting and lowering of the blocking material in the blocking device for lifting and lowering the blocking material. It is done. By configuring the elevating device using such a constant load spring, for example, the operability at the time of elevating operation by gripping the bottom rail (weight member) provided at the lower end of the shielding material can be improved.

  However, by using the lifting device using a constant load spring, operability at the time of lifting operation by gripping the bottom rail (weight member) can be improved, but the uppermost part which can not be reached or the lowermost part which is difficult to operate There is room for improvement such as further improvement of operability, improvement of safety and reduction of operation load.

  SUMMARY OF THE INVENTION In view of the above problems, the object of the present invention is to make constant the load of a drive shaft for moving up and down a shielding material, further improve operability, preferably improve safety and reduce operation load. It is in providing the shielding apparatus which made it possible.

  The shielding device according to the first aspect of the present invention is a shielding device capable of lifting and lowering the shielding material, and operates a drive shaft for raising and lowering the shielding material and a rail attached to the lower end of the shielding material. First lifting and lowering operation means capable of lifting and lowering the shielding material, and the drive shaft so that the operation load by the first lifting and lowering operation means falls within a predetermined load in the entire lifting and lowering range of the shielding material It is characterized in that it comprises means for applying rotational torque, and second elevation operation means for operating the forward and reverse rotation of the drive shaft to enable elevation of the shielding member.

  A shielding device according to a second aspect of the present invention is a shielding device capable of moving the shielding material up and down, and includes a drive shaft for moving the shielding material up and down, and a rail attached to the lower end of the shielding material. A first lifting and lowering operation means capable of lifting and lowering the shielding material, and the driving so that the operation load by the first lifting and lowering operation means falls within a predetermined load in the entire lifting and lowering range of the shielding material And a second raising and lowering operation means for operating the forward and reverse rotation of the drive shaft to move the shielding member up and down, the second raising and lowering operation means comprising: It has an operating shaft that can be rotated, and rotation of the operating shaft is accelerated at a predetermined transmission ratio in order to shorten the operation amount related to the lifting operation of the shielding member by the second lifting operation means. It further comprises speed increasing means for transmitting to the drive shaft. .

  A shielding device according to a third aspect of the present invention is a shielding device capable of moving the shielding material up and down, and includes a drive shaft for moving the shielding material up and down, and a rail attached to the lower end of the shielding material. A first lifting and lowering operation means capable of lifting and lowering the shielding material, and the driving so that the operation load by the first lifting and lowering operation means falls within a predetermined load in the entire lifting and lowering range of the shielding material And a second raising and lowering operation means for operating the forward and reverse rotation of the drive shaft to move the shielding member up and down, the second raising and lowering operation means comprising: An operation pulley that is engaged with and coupled to the drive shaft or an operation shaft that rotates in conjunction with the drive shaft, and an end pulley that is hung on the operation pulley and is disconnected at both ends without connection An auxiliary operating device having an operating code; The features.

  Further, in the shielding device according to the first to third aspects of the present invention, the second lifting and lowering operation means operates forward and reverse rotation of the drive shaft by manual operation with an operation code or electric operation with an electric motor. Thus, the shielding member can be moved up and down.

  Further, in the shielding device according to the first to third aspects of the present invention, the means for applying a rotational torque to the drive shaft includes a constant load spring or a motor spring for applying the rotational torque to the drive shaft. It is characterized by

  Further, in the shielding apparatus of the third aspect according to the present invention, the operation code is configured to move in conjunction with the operation by the first lifting and lowering operation means, and grips are attached to both ends of the operation code. It is characterized by being.

  Further, in the shielding device of the third aspect according to the present invention, when the operation pulley in the auxiliary operation device is engaged with and connected to the operation shaft, the second operation can be performed when the operation shaft is interlocked with the drive shaft. In order to shorten the operation amount related to the lifting and lowering operation of the shielding material by the lifting and lowering operation means, the apparatus further comprises speed increasing means for increasing the speed of rotation of the operation shaft by a predetermined transmission ratio and transmitting it to the drive shaft. I assume.

  Further, in the shielding apparatus according to the third aspect of the present invention, the means for applying a rotational torque to the drive shaft includes an engagement shaft engaged with the drive shaft and rotation of the drive shaft at the predetermined transmission ratio. A constant load spring in which one end is fixed to the engagement shaft and the other end is fixed to the transmission shaft so as to intersect with the transmission shaft which decelerates and rotates and intersects the engagement shaft and the transmission shaft; The rotational torque is applied to the drive shaft by the action of the constant load spring regardless of the elevation position of the rail.

  Further, in the shielding device according to the first to third aspects of the present invention, the rotation is performed to reduce the operation load as an auxiliary function in the function of preventing the weight fall of the rail and the means for applying the rotation torque to the drive shaft. It is characterized by including a braking means having one or both of the functions of applying a braking load to a torque.

  Further, in the shielding apparatus of the third aspect according to the present invention, the shielding material is composed of a plurality of members, and one of the plurality of shielding materials is suspended from the head box of the shielding device to support the first rail. The other of the shielding members is suspended from the first rail to support a second rail, and the first elevation operation means operates each of the first rail and the second rail. The second lifting and lowering operation means is configured to be capable of moving up and down the corresponding shielding member, and operates the forward and reverse rotations of the plurality of drive shafts engaged with each of the plurality of winding shafts to A means for applying rotational torque to the drive shaft is provided for each of the plurality of drive shafts, and the braking means includes the first rail and the first rail. Prevent the weight drop of each of the second rails It is configured to have one or both of a function and a function of applying a braking load to the rotational torque so as to reduce an operation load as an auxiliary function in the means for applying the rotational torque to the drive shaft. It features.

  Further, in the shielding apparatus of the third aspect according to the present invention, the braking means winds up or rewinds a lifting cord which supports each of the first rail and the second rail so as to be able to move up and down. One or more winding shafts among the plurality of winding shafts are configured to apply resistance to the movement of the corresponding raising and lowering cords.

  According to the present invention, the load of the drive shaft for raising and lowering the shielding material is made constant and not only operability at the time of raising and lowering operation by gripping the bottom rail (weight member) is improved, Further operability can be improved in the upper portion and the lower portion which is difficult to operate, and more preferably, safety can be improved and operation load can be reduced.

(A), (b) is the top view and front view which show schematic structure of a pleat screen as an example of the shielding apparatus of 1st Embodiment by this invention, respectively. It is a perspective view which shows schematic structure of the gear unit in the pleated screen as an example of the shielding apparatus of 1st Embodiment by this invention. It is a disassembled perspective view which shows schematic structure of the gear unit in the pleated screen as an example of the shielding apparatus of 1st Embodiment by this invention. It is a perspective view showing a schematic structure of a constant loading unit in a pleated screen as an example of a shielding device of a 1st embodiment by the present invention. It is an exploded perspective view showing a schematic structure of a constant loading unit in a pleated screen as an example of a shielding device of a 1st embodiment by the present invention. It is a perspective view which shows the example of connection of the gear unit and constant load unit in the pleated screen as an example of the shielding apparatus of 1st Embodiment by this invention. (A), (b), (c) is a figure which shows the effect | action of the presence or absence of the constant loading unit in the pleated screen as an example of the shielding apparatus of 1st Embodiment by this invention, respectively. (A), (b) is a top view which shows the example of connection of the several constant load-ized unit and gear unit in the pleat screen as an example of the shielding apparatus of 1st Embodiment by this invention, respectively. (A), (b) is the front view and side view which show schematic structure of the winding-up unit in the pleated screen as an example of the shielding apparatus of 1st Embodiment by this invention, respectively. It is a perspective view showing a schematic structure of a shaft cover which functions as a brake mechanism of a winding unit in a pleated screen as an example of a shielding device of a 1st embodiment by the present invention. (A) is a top view which shows schematic structure of the winding unit in the pleated screen as an example of the shielding apparatus of 1st Embodiment by this invention, (b), (c) is the raising / lowering cord in a winding unit, respectively It is sectional drawing which illustrates the example of arrangement | distribution. (A), (b) is a perspective view which shows schematic structure of the auxiliary operation apparatus of one Example and another example in the pleat screen as an example of the shielding apparatus of 1st Embodiment by this invention, respectively. It is a perspective view which shows operation | movement of the auxiliary operation apparatus of one Example in the pleat screen as an example of the shielding apparatus of 1st Embodiment by this invention. (A), (b) is a side view showing the operation at the time of descent operation about the bottom rail of the pleat screen as an example of the shielding device of a 1st embodiment by the present invention at the time of descent operation and the rise operation, respectively. (A), (b) is the top view and front view which show schematic structure of a pleat screen as an example of the shielding apparatus of 2nd Embodiment by this invention, respectively. (A) is a top view which shows schematic structure of the winding unit in the pleated screen as an example of the shielding apparatus of 2nd Embodiment by this invention, (b), (c) is the raising / lowering cord in a winding unit, respectively It is sectional drawing which illustrates the example of arrangement | distribution. (A), (b) is a side view showing the operation at the time of descent operation about the middle rail of a pleated screen as an example of the shielding device of a 1st embodiment by the present invention at the time of descent operation and rise operation, respectively. (A), (b) is the top view and front view which show schematic structure of the pleated screen of the modification 1 which changed arrangement of a constant load unit and a gear unit respectively as an example of the shielding apparatus of 2nd Embodiment by this invention. It is. (A), (b) is the top view and front view which show schematic structure of the pleated screen of the modification 2 which partially abbreviate | omitted the gear unit as an example of the shielding apparatus of 2nd Embodiment by this invention, respectively.

  Hereinafter, with reference to the drawings, a pleated screen will be representatively described as an example of the shielding device of each embodiment according to the present invention. In the specification of the present invention, with respect to the front view of the pleated screen shown in FIG. 1, the upper side and the lower side are respectively in the upper direction (or upper side) and the lower direction (or lower side) according to the hanging direction of the screen. The left side of the illustrated screen is defined as the left side of the pleated screen, and the right side of the illustrated screen is defined as the right side of the pleated screen. Further, in the example described below, the side to be visually recognized is the front side (or front side) and the opposite side is the rear side (or back side) with respect to the front view of the pleated screen shown in FIG.

First Embodiment
(overall structure)
FIGS. 1A and 1B are 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 the present embodiment includes a screen 10, which is an example of a shielding material, and a head box 20.

  The screen 10 is vertically folded in a zigzag from the head box 20, the upper end of the screen 10 is connected to the head box 20, and the lower end of the screen 10 is connected to the bottom rail 11. A handle 12 is attached to a substantially central portion in the left-right direction of the bottom rail 11, and the elevation of the screen 10 is operated by the elevation of the handle 12 by the user.

  The head box 20 includes one drive shaft 30, two winding units 40 in this example, two gear units 50, and one constant load unit 60 inside the head box 20. One operating shaft 80 and an auxiliary operating device 15 are provided.

  The drive shaft 30 has a polygonal column (a hexagonal column in this example) extending in the left-right direction, and engages with the winding shaft 41 of each winding unit 40, each gear unit 50, and the constant load unit 60. The head box 20 extends almost entirely in the left-right direction, but is not directly engaged with the auxiliary operating device 15 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 frusto-conical shape that rotates integrally with the drive shaft 30 and is rotatably supported with respect to the shaft case 42. The lower end of the take-up shaft 41 is attached to the bottom rail 11 by the rotation of the drive shaft 30, and in this example, the upper end of the lifting cord 13 penetrating the screen 10 can be wound or unwound. Further, the shaft cover 43 is disposed at the base end 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, thereby the bottom rail It functions as a brake mechanism that prevents the 11's own weight drop.

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

  The constant load unit 60 is driven by the drive shaft 30 regardless of the elevation state of the screen 10 so that the operation load of the handle 12 is substantially constant in the entire elevation range of the screen 10 (constant load range). Function as a constant load means for applying a substantially constant rotational torque. Although the details will be described later with reference to FIG. 5, the constant load unit 60 of this example has a predetermined transmission ratio (in this example, a gear ratio) of the rotation of the drive shaft 30 by the left gear unit 50 shown in FIG. 5) and the engagement shaft (engagement shaft 63 shown in FIG. 5) engaged with the drive shaft 30 by the constant load spring 64, and the bottom rail A substantially constant rotational torque is applied to the drive shaft 30 regardless of the elevation position 11.

  The auxiliary operating device 15 shown in FIG. 1 comprises an operating cord 18, an operating pulley 17 for mounting the operating cord 18, and a pulley case 16 for rotatably supporting and housing the operating pulley 17 and via an operating box 90 The head box 20 is disposed at one end (the right end in this example) of the head box 20. Since the operation box 90 is configured to have a simple support function in this example, 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 configured by an end-like ball chain in which two ends of the operation cord 18 are unconnected at both ends. 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 formed of a cord-like cord or an endless ball chain or a cord-like cord.

  The operation pulley 17 is configured to be rotated by the pulling operation of the operation cord 18, and one end of the operation shaft 80 is engaged with the axial center of the operation pulley 17 so as not to be relatively rotatable. Further, the other end of the operating shaft 80 is inserted into and engaged with the gear unit 50 on the right in FIG. 1 via the connecting member 70, and this gear unit 50 has the predetermined transmission ratio described above for the rotation of the operating shaft 80. The speed is increased by (in this example, gear ratio) and transmitted to the drive shaft 30.

  Therefore, the operation pulley 17 is rotated by the pulling operation of the operation cord 18, and the operation shaft 80 is integrally rotated by the rotation of the operation pulley 17, and the rotation of the operation shaft 80 is indicated by the gear unit 50 in the right of FIG. The speed is increased and transmitted to the drive shaft 30.

  Therefore, by rotating the operation pulley 17 forward and reverse by pulling the operation cord 18, the drive shaft 30 can be rotated forward and reverse, 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 sequentially described.

(Gear unit)
FIG. 2 is a perspective view showing a schematic configuration of the gear unit 50 according to the present embodiment. Moreover, FIG. 3 is an exploded perspective view which shows schematic structure of the gear unit 50 which concerns on this embodiment.

  First, as shown in FIG. 2, the gear unit 50 has a box shape, and can be connected via the connecting member 70 with the operation shaft 80 as an input shaft. In the connecting member 70, a hexagonal hole 70H through which the operating shaft 80 having a hexagonal column shape is inserted and engaged in this embodiment is formed to penetrate, and in the present embodiment, a hexagonal shaft 70a is formed at one end thereof. When the hexagonal shaft 70a of the connecting member 70 engages with the hexagonal hole 55H formed through the large diameter gear 55 of the gear unit 50, the large diameter gear 55 rotates integrally with the rotation of the operation 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 in FIG. 1 and is a constant load unit shown on the left in FIG. In the gear unit 50 connected to 60, this connecting member 70 is not used.

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

  First, the large diameter gear 55 is rotatably supported by the shaft holes 51m of both gear cases 51 so that the rotation shafts 55a slightly projecting from both ends thereof are rotatably supported. Further, in the large diameter gear 55, a hexagonal hole 55H which can be engaged with the hexagonal shaft 70a of the connecting member 70 is formed in a penetrating manner. 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 has a size that penetrates without engagement with the operation shaft 80 shown in FIG. 2 and the drive shaft 30 having the same diameter and shape as the operation shaft 80. 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 in the figure, and the gear on the right in the figure There is only a case where the operation 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 the second embodiment to be described later with reference to FIG. 15 have the same shape as this gear unit 50, and drive shafts 30A and 30B with respect to hexagonal holes 55H of large diameter gear 55. It should be noted that (the operation shaft 80 and the drive shaft 30 have the same diameter and the same shape) can be penetrated without engagement.

  The transmission gear 54 meshes with both the large diameter gear 55 and the small diameter gear 53, and rotary shafts 54a slightly protruding from both ends thereof are provided in the shaft hole 51j of one gear case 51 and the shaft hole 51j of the other gear case 51. It is pivotally supported rotatably. Incidentally, since the pair of gear cases 51 can be oppositely fitted in the same shape, shaft holes 51 j and shaft holes 51 k are formed in the illustrated vertical direction in each gear case 51.

  The small diameter gear 53 has the same shape as the transmission gear 54, and the rotary shafts 53a slightly projecting from both ends thereof are rotatably supported by the shaft holes 51i of both gear cases 51. Further, in the small diameter gear 53, a hexagonal hole 53H which can be engaged with the drive shaft 30 is formed in a penetrating manner (see FIG. 2).

  The pair of gear cases 51 accommodates the small diameter gear 53, the transmission gear 54, and the large diameter gear 55 in a state in which the transmission gear 54 is engaged with both the large diameter gear 55 and the small diameter gear 53, It comes to have a box shape. For this opposing fitting, the pair of gear cases 51 are formed such that the fitting claws 51a and the fitting receiving portions 51b, and the fitting claws 51e and the fitting receiving portions 51f, which are fitted to each other, are illustrated. ing. The pair of gear cases 51 are shown with a circular convex portion 51c and a circular concave portion 51d, and a flat convex portion 51g and a flat concave portion 51h, which engage with each other in order to prevent the fitting displacement when the pair of gear cases 51 is engaged with each other. It is formed to be.

  Thus, the gear unit 50 rotatably supports the small diameter gear 53, the transmission gear 54, and the large diameter gear 55 without rattling while the transmission gear 54 meshes with both the large diameter gear 55 and the small diameter gear 53. Can. Further, by forming the pair of gear cases 51 having the same shape and facing each other, the members can be made common, contributing to cost reduction by eliminating the need for extra mounting screws and the like related to the casing.

  Further, the pair of gear cases 51, which will be described later with reference to FIG. 6, a fitting receiving portion which can be fitted with the fitting claw portion 61h of the constant load unit 60 in order to connect with the constant load unit 60. 51p is formed.

  With the gear unit 50 having such a structure, the rotation of the large diameter gear 55 is transmitted to the small diameter gear 53 in the gear unit 50 shown on the right side in FIG. It operates as a speed increasing means for speeding up the rotation of the combined operating 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 in FIG. 1, the rotation of the small diameter gear 53 is transmitted to the large diameter gear 55, whereby the rotation of the operation shaft 80 is transmitted to increase. For the speeded rotation of the drive shaft 30, separately from the engagement shaft (the engagement shaft 63 shown in FIG. 5) of the constant load unit 60 engaged with the drive shaft 30, the rotation of the drive shaft 30 has a predetermined transmission ratio It operates as a decelerating means for reducing the speed (in this example, gear ratio) and transmitting it to the transmission shaft (transmission shaft 65 shown in FIG. 5) of the constant load unit 60.

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

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

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

  First, in the engagement shaft 63, rotary shafts 63a slightly projecting from both ends thereof are rotatably supported by shaft holes 61f of both spring cases 61. Further, in the engagement shaft 63, a round hole 63H rotatable relative to the drive shaft 30 is formed to penetrate. 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 circumferential surface of the engagement shaft 63 (not shown on the one end 64a with respect to the screw receiver 63b) It is fastened with a mounting screw (not shown) via a screw hole). The one end 64 a of the constant load spring 64 may be any form as long as it is held by pre-winding on the engagement shaft 63, and may be fixed without using a mounting screw. The engagement shaft 63 can be wound or unwound from the constant load spring 64 according to the rotation of the drive shaft 30, and the engagement shaft 63 of the engagement shaft 63 can be prevented from being misaligned. Flanges are formed on both ends of the circumferential surface as illustrated.

  In the transmission shaft 65, a rotation shaft 65a slightly projecting from both ends thereof is rotatably supported by shaft holes 61g of both spring cases 61. The transmission shaft 65 has a hexagonal hole 65d at one end, and a hexagonal shaft 65b projecting outward from the spring case 61 at the other end (see FIG. 6). A round hole-like through hole 65H communicates with the hexagonal hole 65d. As shown in FIG. 6, the 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.

  Further, 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 circumferential surface of the transmission shaft 65 (the other end with respect to the two screw receptacles 65c It is fastened by the mounting screw 62 through the screw hole 64c on the 64b). The transmission shaft 65 can wind or rewind the constant load spring 64 according to the rotation of the drive shaft 30, and the circumferential surface of the transmission shaft 65 prevents the winding displacement. At the upper ends, flanges are formed as illustrated.

  The pair of spring cases 61 accommodates the engagement shaft 63, the constant load spring 64, and the transmission shaft 65 in a state where the constant load spring 64 can be wound around the engagement shaft 63 or the transmission shaft 65, respectively. By opposing fitting, it comes to have a box shape. For this opposing fitting, the pair of spring cases 61 are formed such that the fitting claws 61a and the fitting receiving portions 61c of the fitting receiving pieces 61b are fitted. Further, the pair of spring cases 61 are formed so that angular convex portions 61 d and angular concave portions 61 e which engage with each other are illustrated in order to prevent a fitting deviation at the time of opposingly fitting each other.

  Thus, in the state where the constant load spring 64 can be wound around the engagement shaft 63 or the transmission shaft 65, the constant load unit 60 can rotatably support the engagement shaft 63 and the transmission shaft 65 without rattling. It can be done. Further, by forming the pair of spring cases 61 having the same shape and facing each other, the members can be made common, and unnecessary mounting screws and the like relating to the casing become unnecessary, which contributes to cost reduction.

  The constant load spring 64 has one end 64a fixed on the circumferential surface of the engagement shaft 63 so as to intersect between the engagement shaft 63 and the transmission shaft 65 as shown in FIG. 64 b is fixed on the circumferential surface of the transmission shaft 65.

  The constant load spring 64 is unwound from the engagement shaft 63 when wound around the transmission shaft 65 and wound around the engagement shaft 63 when unwound from the transmission shaft 65, but by the action of the gear unit 50. The engagement shaft 63 and the transmission shaft 65 rotate in the same direction, and the rotational 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, as shown in FIG. 6, the pair of spring cases 61 of the constant load unit 60 has a fitting claw portion 61h that can be fitted with the fitting receiving portion 51p of the gear unit 50 in order to couple with the gear unit 50. In the state where the constant load unit 60 and the gear unit 50 are connected, the hexagonal shaft 65b protruding 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. When the large diameter gear 55 of the gear unit 50 is rotated, the transmission shaft 65 of the constant load unit 60 is integrally rotated.

  Then, the constant load unit 60 is engaged with the transmission shaft 65 and the drive shaft 30 by decelerating the rotation of the drive shaft 30 at a predetermined transmission ratio (in this example, the gear ratio) by the gear unit 50 on the left in FIG. A constant load torque spring 64 is connected to the mating engagement shaft 63 to apply a constant rotational torque to the drive shaft 30 regardless of the elevation position of the bottom rail 11.

  For example, as shown in FIG. 7A, the raising and lowering cords 13 wound around the winding shaft 41 while causing the shaft cover 43 (details will be described later) to act as a brake mechanism by each winding unit 40. 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), when the constant load unit 60 configured as described above is not provided, the weight of the screen 10 decreases linearly. The operation load of the handle 12 changes substantially linearly from La to Lb, and the upward operation of the handle 12 becomes particularly heavy.

  Therefore, a constant load unit 60 configured as described above is provided, and as shown in FIG. 7C, the load Lc is stable and uniform within a predetermined load (constant load range). Thus, a rotational torque that makes the drive shaft 30 substantially constant is applied. That is, in FIG. 7C, the constant load range (load width with constant load) centering on the load Lc is smaller than La-Lb, and the upper limit Hmax is preferably optimized by optimization design of the constant load spring 64. And the lower limit Hmin can realize a uniform load Lc. Also, the load Lc can be substantially reduced by designing so as to satisfy La> Lc ≧ Lb, but more preferably by designing so as to satisfy La> Lb> Lc, It is also possible to achieve a constant load over the entire area between the upper limit Hmax and the lower limit Hmin and to reduce the load.

  As described above, the constant load unit 60 is configured with respect to the drive shaft 30 engaged with the engagement shaft 63 regardless of the elevation state of the screen 10 by the winding-up or unwinding of the lifting cord 13 by the winding shaft 41. It is configured to apply a substantially constant rotational torque that falls within a predetermined load (constant load range), and makes the operating load on the handle 12 substantially constant and uniform throughout the entire lifting range of the screen 10, thereby operating It is possible to reduce the load.

  By the way, in consideration of the case where the weight of the shielding material is different for each shielding device (in this example, 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 is formed with a fitting receiving portion 61 i that enables connection with the additional constant load unit 60. In this case, for example, as shown in FIG. 8A, a plurality of constant load conversion units 60 can be connected, and the fitting receiving portion 61i and the fitting claw portion 61h of one of the constant load conversion units 60 are respectively connected It can be connected by fitting the fitting claw portion 61h and the fitting receiving portion 61i of the other constant load unit 60, and additionally, the gear unit 50 can be connected as described above.

  In addition, when a plurality of constant load conversion units 60 are connected, as understood from FIG. 4, the hexagonal shaft 65 b protruding outward from the spring case 61 of one of the constant load conversion units 60 of the other constant load conversion unit 60 is It can be engaged with the hexagonal hole 65d. Thereby, even when the weight of the shielding member differs for each shielding device, the rotational torque to be applied to the drive shaft 30 can be adjusted by the number of installed constant load units 60.

  Further, depending on the application having a plurality of drive shafts (not shown), for example, as shown in FIG. 8B, the gear unit 50 can be connected between the two constant load units 60. In this case, the hexagonal shaft 65b protruding outward from the spring case 61 of one of the constant load units 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 circular through hole 65H is formed to communicate with the hexagonal hole 65d, but as described above, the through hole 65H is not shown in FIG. When used as the constant load units 60A and 60B in the second embodiment described later with reference to, the drive shafts 30A and 30B (having the same diameter and shape as the operation shaft 80 and the drive shaft 30) can penetrate without engagement Keep in mind that

(Take-up unit with shaft cover that functions as a brake mechanism)
9A and 9B are a front view and a side view showing a schematic configuration of the winding unit 40 according to the present embodiment, respectively, and FIG. 10 is a brake mechanism of the winding unit 40 according to the present embodiment. It is a perspective view which shows schematic structure of the shaft cover 43 which functions as. 11 (a) is a plan view showing a schematic configuration of the winding unit 40 according to the present embodiment, and FIGS. 11 (b) and 11 (c) are arrangements of the lifting cords 13 in the winding unit 40, respectively. It is a sectional view which illustrates 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 having an open upper surface. The take-up shaft 41 has a hexagonal shaft hole 41a through which the drive shaft 30 is engaged, has a truncated cone shape that rotates integrally with the drive shaft 30, and is rotatable relative to the shaft case 42 It is supported. The winding shaft 41 can wind or rewind the upper end of the raising and lowering cord 13 which has its lower end attached to the bottom rail 11 and penetrates the screen 10 by the rotation of the drive shaft 30.

  The shaft case 42 is provided with a pair of unit side walls 42 a extending leftward and rightward. Each unit side wall 42a includes a locking hole 42b penetrating the unit side wall 42a.

  Further, the shaft cover 43 is disposed at the base end of the winding shaft 41, and by providing resistance to the movement of the lifting cord 13 wound around the winding shaft 41, the weight fall of the bottom rail 11 is prevented. Function as a braking mechanism.

  More specifically, the shaft cover 43 has a shape that covers the proximal end portion of the winding shaft 41 and a part of the drive shaft 30 inserted into the winding shaft 41. The shaft cover 43 is provided with a locking projection 43b and an insertion projection 43c as a protrusion that can be engaged with each locking hole 42b. The shaft cover 43 is assembled to the shaft case 42 by first inserting the insertion protrusion 43c into the locking hole 42b and then fitting the locking protrusion 43b into the other locking hole 42b.

  As shown in FIG. 10, the shaft cover 43 includes a cover main body 44 having a plate shape that covers the proximal end of the winding shaft 41. The cover main body 44 is provided with a covering surface 44S that is a curved surface that follows the outer peripheral surface of the winding shaft 41 and protrudes upward at a position that is the outer side in the radial direction of the winding shaft 41.

  Both end walls in the left-right direction of the shaft cover 43 include brake portions 45 protruding from the respective end walls to the outside of the shaft cover 43. Each brake portion 45 is a pair at each end face of the shaft cover 43 at the front and rear. Each brake portion 45 is located above the covering surface 44S, and is located outside the covering surface 44S in the radial direction of the winding shaft 41. The pair of brake portions 45 are formed in the front and back, in order to be able to support two take-up shafts 41A and 41B described later by the cover main body 44, and in the first embodiment, it is one It may be provided only at the upper part of the winding shaft 41. Further, the shaft cover 43 has a rotationally symmetrical shape that is symmetrical in the left and right direction and the front and back direction with reference to the center thereof, and the assemblability with respect to the shaft case 42 is improved.

  Elevating cords 13 are hooked on each brake portion 45 so as to provide resistance to the movement of the elevating cords 13 wound around the winding shaft 41 (described later with reference to FIG. 11).

  At the tip of each brake 45, a retaining portion 43a is formed which functions as a release prevention of the lifting cord 13 hooked on the brake 45. The movement of the lifting cord 13 is also resisted by the friction between the lifting cord 13 and the retaining portion 43a.

  When one take-up shaft 41 is supported by the winding unit 40 as shown in FIG. 11A, the brake portion 45 of the shaft cover 43 is raised and lowered on the base end of the take-up shaft 41. As shown in the cross section AA 'of the first example shown in FIG. 11 (b), hanging the lifting cord 13 from the front side of the central axis of the winding shaft 41, or As shown in the cross section AA 'of the second example shown in (c), the elevation cord 13 can be made to hang from the rear side of the central axis of the winding shaft 41.

  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 all over the head box 20 in the left-right direction. However, the head box cover 21 does not have to cover the whole of the head box 20 in the left-right direction, as long as at least the brake portion 45 is covered.

  In the first example shown in FIG. 11B, the lifting cord 13 hooked on the brake 45 is suspended through the insertion hole 42H penetrating the bottom wall of the shaft case 42 on the front side of the center of the winding shaft 41. For example, it passes through the screen 10 and is attached to the bottom rail 11, but it receives not only the load of the bottom rail 11, but also the load of the screen 10 being folded. At this time, the lifting cord 13 is pulled downward from the brake 45 and is bent following the upper surface of the brake 45, and thereafter, the lifting cord 13 starts to be wound from the front side of the winding shaft 41. Thus, the movement of the lifting cord 13 is resisted by the brake unit 45 that causes the lifting cord 13 to bend.

  In the second example shown in FIG. 11C, the lifting cord 13 hooked on the brake 45 is suspended through the insertion hole 42H penetrating the bottom wall of the shaft case 42 on the rear side of the center of the winding shaft 41. For example, it passes through the screen 10 and is attached to the bottom rail 11, but in this case not only the load of the bottom rail 11 but also the load of the screen 10 being folded in is received. At this time, the lifting cord 13 is pulled downward from the brake 45 and is bent following the upper surface of the brake 45, and thereafter, the lifting cord 13 starts to be wound from the rear side of the winding shaft 41. The brake 45 also causes bending of the lifting cord 13 suspended from the rear side of the winding shaft 41 in this manner, and resistance to the movement of the lifting cord 13 is given.

  In addition, since the head box cover 21 is positioned above the brake portion 45, the lifting cord 13 is also prevented from coming off from the brake portion 45 when the lifting cord 13 floats upward (outward in the radial direction) from the brake portion 45.

  In the present embodiment shown in FIG. 1, shaft covers 43 functioning as a brake mechanism are respectively provided to a plurality of (two in this example) winding units 40, and the shaft covers 43 in the respective winding units 40 are provided. Although the example which gives resistance to movement of the raising / lowering cord 13 via the corresponding raising / lowering cord 13 is shown, it is not necessary to limit to this form.

  For example, in the plurality of (two in this example) winding units 40, any one or more (including all) lifting cords 13 are not passed through the shaft cover 43 (without operating the brake mechanism) , Can be configured pleated screen. Therefore, the braking setting by the brake mechanism can be finely adjusted as the entire pleated screen.

  That is, depending on the weight of the fabric used as the screen 10, the size of the pleated screen, etc., a predetermined resistance is indirectly given to the movement of the lifting cord 13 by the function of the constant load unit 60 without providing a brake mechanism. Form.

  That is, the constant load unit 60 is used for the weight of the fabric used as the screen 10, the size of the pleated screen, and the presence or absence of a brake mechanism that resists the movement of the lifting cord 13, or the overall braking load of the brake mechanism. Accordingly, in order to reduce the operation load, it can be set to fall within a predetermined constant load range. When the brake mechanism is used, the function of the constant load unit 60 (the operation load is predetermined, instead of or in addition to the role of preventing the fall of the weight of the bottom rail 11 or the screen 10 by the brake mechanism. It can be used as an auxiliary function of the function of applying rotational torque to the drive shaft 30 so as to be contained in the load, and the braking load applied to the rotational torque can be finely adjusted and set so as to reduce the operation load.

(Auxiliary operating device)
By configuring the load on the bottom rail 11 to be substantially constant in the entire lifting range of the screen 10 by the action of the constant load unit 60 described above, the user can be configured to fall within a predetermined load (constant load range). Therefore, the operation load in the lifting and lowering operation by the handle 12 is reduced, and the lifting and lowering of the screen 10 becomes smooth, and the operability is improved. However, in the raising and lowering operation by the handle 12, since there is room for improvement in terms of further operability at the uppermost portion which can not be reached and the lower portion which is difficult to operate, in the present embodiment, as shown in FIG. An operating device 15 is provided.

  FIGS. 12 (a) and 12 (b) are perspective views showing the schematic configuration of the auxiliary operating device 15 according to one embodiment and another embodiment according to the present embodiment, respectively.

  The auxiliary operating device 15 illustrated in FIGS. 12 (a) and 12 (b) comprises an operating cord 18, an operating pulley 17 for hooking the operating cord 18, and a pulley case 16 for supporting and storing the operating pulley 17. As shown in FIG. 1, the head box 20 is disposed at one end (the right end in this example) of the head box 20 via the operation box 90. Since the operation box 90 is configured to have a simple support function in this example, 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 constituted by an end-like ball chain in which two ends are not connected and two hanging ends are provided. An indoor grip 19F and an outdoor grip 19R are attached to each end of the operation cord 18, respectively. The operation code 18 may be formed of a cord-like cord.

  On the other hand, as another example shown in FIG. 12 (b), the operation cord 18 may be constituted by an endless ball chain or a cord having a safety chain 18L which is released by a predetermined tensile force or more. However, in the case of an end-like operation cord 18 in which both ends are disconnected and two hanging as shown in FIG. 12A for the reason described later, there is an advantage that the operation state can be understood at a glance. For example, the safety is improved because the head of an infant etc. is surely prevented from being caught, and the operation load can be reduced since 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 operation pulley 17 is configured to rotate in response to the pulling operation of the operation cord 18, and one end of the operation shaft 80 engages with the axial center of the operation pulley 17 so as to be non-relatively rotatable. Further, the other end of the operating shaft 80 is inserted into and engaged with the gear unit 50 on the right in FIG. 1 via the connecting member 70, and this gear unit 50 has the predetermined transmission ratio described above for the rotation of the operating shaft 80. The speed is increased by (in this example, gear ratio) and transmitted to the drive shaft 30.

  Therefore, the operation pulley 17 is rotated by the pulling operation of the operation cord 18, and the operation shaft 80 is integrally rotated by the rotation of the operation pulley 17, and the rotation of the operation shaft 80 is indicated by the gear unit 50 in the right of FIG. The speed is increased and transmitted to the drive shaft 30.

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

  For example, during the lowering operation shown in FIG. 14 (a), the stroke from the top to the bottom of the screen 10 is L1, and it is possible that the lowering operation with the handle 12 may not reach the top In other words, the operation by the handle 12 can release only to the reachable range).

  Therefore, in the case of the auxiliary operation device 15 shown in FIG. 13, in the lowering operation with the handle 12, not only the lowering operation by the pulling operation of the operation cord 18 can be performed by the operation of the gear unit 50, The stroke L2 can be reduced as the movable area of the indoor grip 19F (or the movable area of the outdoor grip 19R) with respect to the stroke L1 from the top to the bottom of the screen 10.

  Further, in the case of the auxiliary operating device 15 shown in FIG. 13, by using the operation cord 18 in which both ends are disconnected and two hanging down, when it is desired to perform the lowering operation shown in FIG. It can be understood at a glance that it is sufficient to operate the grip 19R. Furthermore, the safety is improved, for example, because the head of an infant or the like is reliably prevented from being caught.

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

  Further, even in the lifting operation shown in FIG. 14B, the stroke from the top to the bottom of the screen 10 is L1, and in the lifting operation by the handle 12, the bottom lifting operation is difficult to perform.

  Therefore, in the case of the auxiliary operating device 15 shown in FIG. 13, in the raising operation by the handle 12, not only the raising operation by the pulling operation of the operation cord 18 can be performed at the lower part which is difficult to operate. The stroke L2 can be reduced as the movable area of the indoor grip 19F (or the movable area of the outdoor grip 19R) with respect to the stroke L1 from the top to the bottom.

  Further, in the case of the auxiliary operating device 15 shown in FIG. 13, the operation cord 18 is configured such that both ends are disconnected and two hanging down, and when it is desired to perform the lifting operation shown in FIG. It can be understood at a glance that it is sufficient to operate the grip 19F. Furthermore, the safety is improved, for example, because the head of an infant or the like is reliably prevented from being caught.

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

  Therefore, according to the present embodiment, the load of the drive shaft 30 for lifting and lowering the screen 10 is made constant, and the operability at the time of lifting and lowering operation by gripping the bottom rail 11 (at the time of lifting and lowering operation by the handle 12) is improved. Not only that, it is possible to further improve operability at the out-of-hand top portion and the bottom portion which is difficult to operate, and more preferably, safety can be improved and operation load can be reduced.

Second Embodiment
(overall structure)
Fig.15 (a), (b) is the top view and front view which show schematic structure of a pleat screen as an example of the shielding apparatus of 2nd Embodiment by this invention, respectively. As shown in FIG. 15, the pleated screen of the present embodiment includes a lower screen 10A and an upper screen 10B, which are an example of a shielding material, and a head box 20.

  The upper screen 10B is bent in a zigzag form in the vertical direction from the head box 20. The upper end of the upper screen 10B is connected to the head box 20, and the lower end of the upper screen 10B is connected to the intermediate rail 11B. The lower screen 10A is bent in a zigzag shape in the vertical direction from the intermediate rail 11B. The upper end of the lower screen 10A is connected to the middle rail 11B, and the lower end of the lower screen 10A is connected to the bottom rail 11A. The handle 12A is attached to the center of the bottom rail 11A in the left-right direction, and the handle 12B is attached to the center of the middle rail 11B in the left-right direction. The elevation of the upper screen 10B can be operated by the elevation of the handle 12B by the user. The elevation of the lower screen 10A can be operated by the elevation of the handle 12A by the user.

  In the head box 20, the drive shaft 30A, each take-up shaft 41A in the two winding units 40 in this example, the two gear units 50A, the constant load unit 60A, the operation shaft 80A, and the auxiliary operation device 15A , And the lower screen 10A and the bottom rail 11A.

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

  The drive shaft 30A has a polygonal column (a hexagonal column 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. The head box 20 extends substantially in the left-right direction, but 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 column (a hexagonal column 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. The head box 20 extends substantially in the left-right direction, but is not directly engaged with the auxiliary operating device 15B having the same structure as that of the first embodiment.

  The drive shafts 30A and 30B are disposed 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, a shaft case 42, and a shaft cover 43 at the front and back, and the winding shaft 41 and the shaft case 42 of the first embodiment, respectively. 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 with respect to the shaft case 42. The lower ends of the winding shafts 41A and 41B are attached to the bottom rail 11A and the intermediate rail 11B by the rotation of the driving shafts 30A and 30B, respectively, and the upper ends of the lifting cords 13A and 13B can be wound or unwound. It has become. The shaft cover 43 is disposed at the base end of the winding shafts 41A and 41B in each winding unit 40, and resists the movement of the lifting cords 13A and 13B wound around the winding shafts 41A and 41B. Functions as a brake mechanism that prevents the weight lowering of the bottom rail 11A and the middle rail 11B.

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

  Then, one of the two gear units 50A (left in the figure) is connected to the constant load unit 60A, and the engagement shaft of the constant load unit 60A engaged with the drive shaft 30A (the engagement shaft shown in FIG. 5) Apart from 63), it operates as a speed reduction means that decelerates the rotation of the drive shaft 30A with a predetermined transmission ratio (gear ratio in this example) and transmits it to the transmission shaft (transmission shaft 65 shown in FIG. 5) of the constant load unit 60A. The other (right in the figure) is the rotation of the operation shaft 80A inserted and engaged through the connecting member 70A (the same structure as the connecting member 70 shown in FIG. 2) to the predetermined transmission ratio (in this example, gear ratio) Operates as a speed increasing means for increasing speed and transmitting it to the drive shaft 30A.

  In addition, one of the two gear units 50B (right side in the drawing) is connected to the constant load unit 60B, and an engagement shaft of the constant load unit 60B engaged with the drive shaft 30B (an engagement shaft shown in FIG. 5) Apart from 63), it operates as a speed reduction means that decelerates the rotation of the drive shaft 30B with a predetermined transmission ratio (gear ratio in this example) and transmits it to the transmission shaft (transmission shaft 65 shown in FIG. 5) of the constant load unit 60B. The other (the left in the figure) shows the rotation of the interlocking operation shaft 81B inserted and engaged through the connecting member 70B (the same structure as the connecting member 70 shown in FIG. 2) to the predetermined transmission ratio (in this example, the gear ratio) ) And operates as a speed increasing means for transmitting 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 operation load of the handle 12A is substantially constant in the entire elevation range of the lower screen 10A (constant load range). It functions as a constant load means for applying 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 operation load on the handle 12B is substantially constant in the entire elevation range of the upper screen 10B (constant load range). It functions as a constant load means for applying a substantially constant rotational torque to the shaft 30B.

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

  The auxiliary operating device 15A includes an operation cord 18A, an operation pulley 17A for mounting the operation cord 18A, and a pulley case 16A for rotatably supporting and accommodating the operation pulley 17A, and the head box 20 through the operation box 90A. Is disposed on one end (the right end in this example) of In particular, as in the first embodiment, the operation cord 18A has two ends hanging down with both ends disconnected, and the indoor grip 19AF and the outdoor grip 19AR are attached to each end of the operation cord 18A. Is preferred. Since the operation box 90A is configured to have a simple support 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 operating device 15B includes an operation cord 18B, an operation pulley 17B for mounting the operation cord 18B, and a pulley case 16B for rotatably supporting and accommodating the operation pulley 17B, and the head box 20 is connected via the operation box 90B. Is disposed on the other end side (the left end in this example). In particular, as in the first embodiment, two operation cords 18B are formed by dropping both ends without connection, and an indoor grip 19BF and an outdoor grip 19BR are attached to each end of the operation cord 18B. Is preferred. Since the operation box 90B is configured to have a simple support function in this example, the pulley case 16B may be fitted to one end of the head box 20 without using the operation box 90B. However, in the present embodiment, in the operation box 90B, a drive gear 91 rotating integrally with the operation shaft 80B and a driven gear 92 meshing with the drive gear 91 so as to reverse at the same speed are integrally rotated with the driven gear 92. The interlocking operation shaft 81B is inserted into and engaged with the other (left in the drawing) gear unit 50B 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 are configured in the same shape as the gear unit 50 of the first embodiment. The drive shafts 30A and 30B can penetrate in a nonengaging manner with respect to the hexagonal holes 55H. Therefore, as shown in FIG. 15, in the head box 20, for raising and lowering the lower screen 10A and the gear unit 50A for raising and lowering operation of the bottom rail 11A and the constant load unit 60A, and for raising and lowering the upper screen 10B and the intermediate rail 11B. Gear unit 50B and constant load unit 60B can be arranged in a line, and the gear unit 50 and constant load unit 60 shown in FIG. 6 can be applied to various shielding devices. And it is excellent in general-purpose use and can realize high accommodation.

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

  Further, by rotating the operation pulley 17B forward and reverse by pulling the operation cord 18B, the drive shaft 30B can be rotated forward and reverse, and the upper screen 10B can be raised and lowered while taking advantage of the function of the constant load unit 60B.

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

  Further, in the head box 20, the drive shaft 30B, the take-up shaft 41B, the gear unit 50B, the constant load unit 60B, the operation shaft 80B, and the auxiliary operating device 15B are for lifting and lowering operations of the upper screen 10B and the intermediate rail 11B. Therefore, substantially the same operation as the drive shaft 30, the winding shaft 41, the gear unit 50, the constant load unit 60, the operation shaft 80, and the auxiliary operation device 15 in the first embodiment is performed. . 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 drive gear 91 and the driven gear 92, and the operation on the indoor side As in the case where the lower screen 10A is lifted by the pulling operation of the cord 18A, the upper screen 10B is lifted by the pulling operation of the operation code 18B on the indoor side.

  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, but just in case, it will be described with reference to FIG. Do.

  As shown in FIG. 16 (a), the two winding shafts 41A and 41B are supported by the winding unit 40, and the brake portion 45 of the shaft cover 43 is disposed on the proximal end of the winding shafts 41A and 41B. Lifting cords 13A and 13B are hooked, and as shown in the cross section AA 'of the first example shown in FIG. 16 (b), the front side of the center axis of the winding shaft 41A and the winding shaft 41B The elevating cords 13A and 13B are suspended from the rear side of the central axis and the rear side of the central axis of the take-up shaft 41A, as shown in the second example AA ′ cross section shown in FIG. Thus, the lifting cords 13A and 13B can be suspended.

  And in FIG.16 (b), (c), the head box cover 21 abbreviate | omitted in FIG. 16 (a) is shown. The head box cover 21 covers the drive shafts 30A and 30B, the winding unit 40, the gear units 50A and 50B, the constant load units 60A and 60B, and the like over the whole of the head box 20 in the left-right direction. . However, the head box cover 21 does not have to cover the whole of the head box 20 in the left-right direction, as long as at least the brake portion 45 is covered.

  In the first example shown in FIG. 16 (b), the lifting cords 13A and 13B hooked on the respective brake portions 45 are on the front side of the center of the winding shaft 41A and after the center of the winding shaft 41B. For example, the lifting cord 13A penetrates the upper and lower screens 10B and 10A, and the lifting cord 13B penetrates the upper screen 10B, and the bottom rail 11A and the bottom rail 11A respectively. It is attached to the middle rail 11B. Each raising and lowering cord 13A, 13B receives not only the load of the bottom rail 11A and the middle rail 11B but also the load of the lower screen 10A and the upper screen 10B which are folded. At this time, the raising and lowering cords 13A and 13B are pulled downward from the brakes 45 and follow the upper surface of the brakes 45 and bend, and thereafter, the raising and lowering 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. Thus, resistance is given to movement of each raising and lowering cord 13A, 13B by each brake part 45 which causes bending to each raising and lowering cord 13A, 13B.

  In the second example shown in FIG. 16C, the raising and lowering cords 13A and 13B hooked to the respective brake portions 45 penetrate the bottom wall of the shaft case 42 on the rear side of the center of the winding shaft 41A. The lifting cords 13A, for example, penetrate through the upper and lower screens 10B and 10A, and the lifting cords 13B pass through the upper screen 10B and are attached to the bottom rail 11A and the middle rail 11B, respectively. Each raising and lowering cord 13A, 13B receives not only the load of the bottom rail 11A and the middle rail 11B but also the load of the lower screen 10A and the upper screen 10B which are folded. At this time, the raising and lowering cords 13A and 13B are pulled downward from the brakes 45 and follow the upper surface of the brakes 45 and are bent, and thereafter the raising and lowering cords 13A are viewed from the rear side of the winding shaft 41A. The winding start is started, and the lifting cord 13B starts to be wound from the front side of the winding shaft 41B. Thus, resistance is given to movement of each raising and lowering cord 13A, 13B by each brake part 45 which causes bending to each raising and lowering cord 13A, 13B.

  As described above, in the present embodiment, by pulling the operation cords 18A and 18B forward and reversely rotate the operation pulleys 17A and 17B, the drive shafts 30A and 30B are rotated forward and reverse to form the constant load unit 60A, The lower screen 10A and the upper screen 10B can be raised and lowered while utilizing the action of 60B.

  The operation of raising and lowering the lower screen 10A by the pulling operation of the operation cord 18A is substantially the same as that of the first embodiment, and the pulling operation of the operation cord 18B is also the same as that of the first embodiment. The operation of raising and lowering the upper screen 10B by the pulling operation of the operation code 18B will be described with reference.

  For example, when lowering the upper screen 10B shown in FIG. 17A, the stroke from the top to the bottom of the upper screen 10B is L3, and the lowering operation by the handle 12B can not reach the top Things can happen (in other words, operation with the handle 12B can only release to the reach of the hand).

  Therefore, in the case of the auxiliary operation device 15B configured in the same manner as that shown in FIG. 13 in the first embodiment, the lowering operation by the operation cord 18B is performed even at the uppermost portion which can not reach the hand by the lowering operation by the handle 12B. Not only can it be reduced to the stroke L4 as the movable area of the indoor grip 19BF (or the movable area of the outdoor grip 19BR) with respect to the stroke L3 from the top to the bottom of the upper screen 10B by the action of the gear unit 50B. It can be done.

  Further, in the case of the auxiliary operating device 15B configured in the same manner as that shown in FIG. 13 in the first embodiment, the operation cord 18B in which the two end portions are disconnected and two hanging down is provided, as shown in FIG. When it is desired to perform the downward operation shown, it can be understood at a glance that the outdoor grip 19BR may be operated. Furthermore, the safety is improved, for example, because the head of an infant or the like is reliably 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, respectively, gripping is easy, and the operation load can be reduced.

  Further, even in the lifting operation shown in FIG. 14B, the stroke from the top to the bottom of the upper screen 10B is L3, and it is difficult to lift the lower portion in the lifting operation by the handle 12B.

  Therefore, in the case of the auxiliary operating device 15B configured in the same manner as that shown in FIG. 13 in the first embodiment, in the raising operation by the handle 12B, not only the raising operation by the pulling operation of the operation cord 18B The stroke L4 can be reduced as the movable area of the indoor grip 19BF (or the movable area of the outdoor grip 19BR) by the action of the gear unit 50B with respect to the stroke L3 from the top to the bottom of the upper screen 10B. it can.

  Further, in the case of the auxiliary operating device 15B configured in the same manner as that shown in FIG. 13 in the first embodiment, the operation cord 18B is configured such that the two end portions are disconnected and two hanging down, as shown in FIG. When it is desired to perform the raising operation shown, it can be understood at a glance that the indoor grip 19BF may be operated. Furthermore, the safety is improved, for example, because the head of an infant or the like is reliably 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, respectively, gripping is easy, and the operation load can be reduced.

  Therefore, according to the present embodiment, the load of the drive shafts 30B and 30A for lifting and lowering the upper and lower screens 10B and 10A is made constant, and the lifting operation by gripping the middle rail 11B and bottom rail 11A (handle 12B , 12A), and it is possible to further improve the operability at the uppermost part which can not be reached or at the lowermost part which 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 accommodation.

  In FIGS. 15 (a) and 15 (b), the arrangement of the two gear units 50A and the constant load unit 60A, and the two gear units 50B and the constant load unit 60B in the head box 20 is optional. It is possible to change. For example, as in the first modification shown in FIGS. 18 (a) and 18 (b), two gear units 50A and a constant load unit 60A are disposed on the auxiliary operating device 15A side, and two are provided on the auxiliary operating device 15B side. The gear unit 50B and the constant load unit 60B can also be provided. In this case, since two gear units 50A having the same function and two gear units 50B are disposed adjacent to each other, the gear unit 50A and the gear unit 50B can be combined or omitted one by one. is there. 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.

  Furthermore, if it is not necessary to provide the function of accelerating and transmitting the rotation of the operating shaft 80A to the driving shaft 30A and the function of accelerating and transmitting the rotation of the operating shaft 80B to the driving shaft 30B, for example, As in the second modification shown in 19 (a) and (b), a drive gear 91 rotating integrally with the operation shaft 80A on the auxiliary operation device 15A side, and a driven gear meshing with the drive gear 91 so as to reverse at the same speed. 92 can be disposed to provide the auxiliary operating device 15A and the auxiliary operating device 15B. In the second modification 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 load of the drive shafts 30B and 30A constant. . By replacing the drive gear 91 and the driven gear 92 with the gear unit 50, the function of accelerating and transmitting the rotation of the operation shaft 80A to the drive shaft 30A is provided when the auxiliary operating device 15A is operated. Can.

  Although the present invention has been described above by taking the example of the specific embodiment, the present invention is not limited to the example of the above embodiment, and various modifications can be made without departing from the technical concept thereof. For example, although the example of each embodiment described above has been described on behalf of a preferable example including all means for solving the above-mentioned various problems in the conventional technique, the present invention is intended to solve various problems individually. The shielding device according to the invention can be configured.

  For example, in a shielding apparatus provided with a constant load means for applying a constant rotational torque to a drive shaft regardless of the elevation position of the rail, further improvement of operability at the uppermost part which can not be reached or the lower part which is difficult to operate For the purpose of achieving this, although an example in which the constant load unit 60 is used as the constant load unit has been described, it is not necessary to limit to this. For example, although an example in which the constant load unit 60 and the gear unit 50 are connected has been described, this is effective in that it is excellent in applicability and generalization, but it is effective even if it is excellent in applicability and generalization If it is preferable, a constant load unit that functions alone without using the gear unit 50 may be used, or instead of using the constant load unit 60 as described above, other biasing means such as a motor spring may be used. can do.

  Also, instead of using the shaft cover 43 that applies movement resistance to the lifting and lowering cord as the brake mechanism, it is also possible to apply a braking torque to the drive shaft. Furthermore, instead of the auxiliary operating device being configured to perform manual operation by pulling operation of the operation code as in the example of the embodiment described above, forward and reverse rotation of the drive shaft or interlocking with the drive shaft by electric operation by the electric motor It may be configured by a mechanism that enables raising and lowering of the shielding material (screen) by performing forward and reverse rotation of the rotating operation shaft. The mechanism by such electric operation can be configured by a control device that controls the drive of the electric motor, and a switch that gives the control device an instruction of the lifting operation.

  In addition, in the shielding device provided with a constant load generating means for applying a constant rotational torque to the drive shaft regardless of the elevation position of the rail, both ends of the shield device are disconnected for the purpose of improving safety. It is particularly effective to make a hanging operation code. It is more preferable to provide a grip in the both ends from a viewpoint of reduction of operation load especially.

  Moreover, although the example of the gear unit 50 by an interlocking gear mechanism was demonstrated as a speed-up means, a speed-up means can be comprised using a belt, a wire, etc. FIG.

  Moreover, this invention can be made not only a pleated screen but arbitrary shielding apparatuses which move shielding materials, such as a horizontal blind and a roll screen.

  Therefore, the present invention is not limited to the examples and examples of the above-described embodiments, but is limited only by the claims.

  According to the present invention, the load of the drive shaft for raising and lowering the shielding material is made constant and not only operability at the time of raising and lowering operation by gripping the bottom rail (weight member) is improved, Further operability can be improved in the upper portion and the lower portion which is difficult to operate, and more preferably, safety can be improved and operation load can be reduced. Therefore, the application of the shielding device for moving the shielding material Useful for

DESCRIPTION OF SYMBOLS 10 screen 10A lower screen 10B upper screen 11, 11A bottom rail 11B middle rail 12, 12A, 12B handle 13, 13A, 13B lifting code 15, 15A, 15B auxiliary operation device 17 operation pulley 18, 18A, 18B operation code 19F, 19AF , 19AF indoor side grip 19R, 19AR, 19AR outdoor side grip 20 head box 30, 30A, 30B drive shaft 40 take-up unit 41 take-up shaft 43 shaft cover 50, 50A, 50B gear unit 60, 60A, 60B constant load unit 70 Connection member 80, 80A, 80B Operating shaft 81B Interlocking operating shaft 91 Drive gear 92 Driven gear

Claims (11)

It is a shielding device which enables raising and lowering operation of the shielding material,
A drive shaft for raising and lowering the shielding material,
A first lifting and lowering operation means for operating the rail attached to the lower end of the shielding member to move the shielding member up and down;
A means for applying a rotational torque to the drive shaft such that the operation load by the first lifting and lowering operation means falls within a predetermined load in the entire raising and lowering range of the shielding member;
Second elevation operation means for operating the forward and reverse rotations of the drive shaft to enable elevation of the shielding material;
A shielding apparatus comprising: It is a shielding device which enables raising and lowering operation of the shielding material,
A drive shaft for raising and lowering the shielding material,
A first lifting and lowering operation means for operating the rail attached to the lower end of the shielding member to move the shielding member up and down;
A means for applying a rotational torque to the drive shaft such that the operation load by the first lifting and lowering operation means falls within a predetermined load in the entire raising and lowering range of the shielding member;
Second elevation operation means for operating the forward and reverse rotations of the drive shaft to enable elevation of the shielding material;
Equipped with
The second raising and lowering operation means has an operation shaft that can be rotated.
In order to shorten the operation amount related to the elevation operation of the shielding member by the second elevation operation means, the speed increasing means for accelerating the rotation of the operation shaft at a predetermined transmission ratio and transmitting it to the drive shaft is further provided. A shielding apparatus comprising: It is a shielding device which enables raising and lowering operation of the shielding material,
A drive shaft for raising and lowering the shielding material,
A first lifting and lowering operation means for operating the rail attached to the lower end of the shielding member to move the shielding member up and down;
A means for applying a rotational torque to the drive shaft such that the operation load by the first lifting and lowering operation means falls within a predetermined load in the entire raising and lowering range of the shielding member;
Second elevation operation means for operating the forward and reverse rotations of the drive shaft to enable elevation of the shielding material;
Equipped with
The second lifting and lowering operation means is hooked on an operation pulley that is engaged with and coupled to the drive shaft or to an operation shaft that rotates in conjunction with the drive shaft, and is hooked on the operation pulley to disconnect both ends. And an auxiliary operating device having an end-like operating cord hanging down from two.   The second lifting and lowering operation means is configured to enable lifting and lowering of the shielding member by operating forward and reverse rotation of the drive shaft by manual operation by an operation code or electric operation by an electric motor. Shielding device according to any of the claims 1 to 3, characterized in that.   The means for applying a rotational torque to the drive shaft comprises a constant load spring or a motor spring for applying the rotational torque to the drive shaft, according to any one of claims 1 to 4. Shielding device according to.   4. The apparatus according to claim 3, wherein the operation code is configured to move in conjunction with an operation by the first lifting and lowering operation means, and a grip is attached to each of both ends of the operation code. Shielding device as described. The operating pulley in the auxiliary operating device is engaged and coupled to the operating shaft,
The rotation of the operating shaft is increased by a predetermined transmission ratio in order to shorten the operation amount related to the lifting and lowering operation of the shielding material by the second lifting and lowering operation means when the operation shaft is interlocked with the drive shaft and rotated. The shielding apparatus according to claim 6, further comprising speed increasing means for speeding up and transmitting the speed to the drive shaft.   The means for applying a rotational torque to the drive shaft includes an engagement shaft engaged with the drive shaft, a transmission shaft rotated by reducing the rotation of the drive shaft at the predetermined transmission ratio, and the engagement shaft And the transmission shaft, the constant load spring having one end fixed to the engagement shaft and the other end fixed to the transmission shaft, and the rail by the function of the constant load spring The shielding device according to claim 7, characterized in that the rotational torque is applied to the drive shaft regardless of the elevation position.   One or both of the function of preventing self-weight drop of the rail and the function of applying a braking load to the rotational torque to reduce the operation load as an auxiliary function in the means for applying the rotational torque to the drive shaft 9. A shielding device according to any one of the preceding claims, characterized in that it comprises braking means. The shielding member comprises a plurality of shielding members, one of the plurality of shielding members being suspended from the head box of the shielding device to support a first rail, and the other of the plurality of shielding members being from the first rail Is suspended and supports the second rail,
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 forward and reverse rotations of the plurality of drive shafts engaged with each of the plurality of winding shafts to enable elevation of each of the plurality of shielding members.
Means for applying a rotational torque to the drive shaft are provided for each of the plurality of drive shafts,
The braking means has a function to prevent the respective weight drops of the first rail and the second rail, and a rotation function to reduce an operation load as an auxiliary function in the means for applying a rotation torque to the drive shaft. The shielding device according to claim 9, characterized in that it is configured to have one or both of the functions of applying a braking load to torque.   The braking means winds or lifts a lifting cord supporting the first rail and the second rail so as to move up and down, respectively, or one or more winding shafts among a plurality of winding shafts capable of rewinding. 11. A shielding device according to claim 10, characterized in that it is configured to provide resistance to the movement of the corresponding lifting cord.