JP2008088626A - Elevating apparatus for blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevating apparatus for a blind capable of reducing operation force required when raising a screening member and lowering the screening member lightly. <P>SOLUTION: This elevating apparatus for the blind is provided with a planetary gear mechanism 30 provided with a sun gear 36 to which rotation of an input shaft is transmitted, a planetary carrier 40 for transmitting rotation to an output shaft, and an internal gear 44, a first clutch mechanism 32 for preventing the internal gear 44 from rotating relative to rotation of the input shaft 24 in the rotating direction for elevating the blind and allowing the internal gear 44 to rotate relative to rotation of the input shaft 24 in the rotating direction for lowering the blind, and a second clutch mechanism 34 for rotating the planetary carrier 40 independently from the input shaft 24 relative to rotation of the input shaft 24 in the rotating direction for elevating the blind and rotating the planetary carrier 40 integrally with the input shaft 24 for rotation of the input shaft 24 in the rotating direction for lowering the blind. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lifting / lowering device for a blind that lifts and lowers a blind such as a horizontal blind, a pleated screen, a roman shade, and a roll screen by an operation from an operation unit.

  Conventionally, as this kind of blind lifting device, the one described in Patent Document 1 is known. In the one described in Patent Document 1, an input shaft that is rotated forward and backward based on the operation of the operating means, a drive shaft that is rotated forward and backward based on the rotation of the input shaft, and a rotation of the drive shaft A winding shaft for raising and lowering the shielding material in the head box, a transmission means for transmitting the rotation of the input shaft in the descending direction of the shielding material to the output shaft at a higher speed than the rotation in the shielding material ascending direction; Transmission blocking means for blocking the rotation of the input shaft due to the rotational force acting on the winding shaft based on the weight is provided.

  When the slat pulling operation is performed, the winding shaft is rotated at the same speed as the input shaft. When the slat is lowered, the winding shaft is rotated at a rotational speed faster than the rotational speed of the input shaft. The slat descending speed is increased.

JP 2006-28871 A

  However, in such a conventional apparatus, when the slat is lifted, the input shaft and the winding shaft are rotated at the same speed. For example, in the case of a heavy product such as a wooden blind or a large product size blind, its operation load Becomes very heavy, and there is a problem that operation is difficult for a weak user.

  The present invention has been made in view of such a problem, and provides an elevating device for a blind that can reduce an operation force during a lifting operation of a shielding material and can be easily performed during a lowering operation of a shielding material. The purpose is to do.

In order to achieve the above-described object, the invention described in claim 1 is directed to a blind upward rotation direction corresponding to a blind upward rotation direction and a blind downward rotation direction corresponding to a blind downward direction, which are selectively generated by an operation of the operation unit. A blind lifting device comprising an input shaft to which rotation in one of two rotational directions is transmitted, and an output shaft connected to a lifting shaft for lifting and lowering the shielding material,
A first component that transmits rotation of the input shaft, a second component that transmits rotation to the output shaft, and a third component, and decelerates from the first component to the second component A planetary gear mechanism capable of transmitting
Provided between the input shaft and the planetary gear mechanism, the third component is made non-rotatable with respect to the rotation of the input shaft in the blind ascending rotation direction and decelerated from the first component to the second component. The rotation of the input shaft is transmitted to all the components of the planetary gear mechanism in response to the rotation of the input shaft in the blind downward rotation direction, and the output shaft is rotated at the same speed as the input shaft. A clutch mechanism that switches to transmit,
It is characterized by providing.

According to a second aspect of the present invention, in the first aspect, the first component of the planetary gear mechanism is a sun gear, the second component is a planet carrier that supports the planet gear, and the third component is an internal gear. Yes,
The clutch mechanism disables rotation of the internal gear with respect to rotation of the input shaft in the blind upward rotation direction, and allows rotation of the internal gear with respect to rotation of the input shaft in the blind downward rotation direction. A mechanism is provided.

  According to a third aspect of the present invention, the clutch mechanism according to the second aspect of the present invention separates the rotation of the planet carrier from the input shaft with respect to the rotation of the input shaft in the blind upward rotation direction, and the input shaft rotates in the blind downward rotation direction. On the other hand, a second clutch mechanism for rotating the planet carrier integrally with the input shaft is provided.

  According to a fourth aspect of the present invention, the first clutch mechanism according to the second aspect is provided with a one-way clutch spring wound around the outer periphery of the input shaft and a one-way clutch spring disposed on the outer peripheral side of the one-way clutch spring. A rotation body that transmits the rotation of the clutch spring; and a stopper that is connected to the internal gear and that can be projected and retracted in a radial direction depending on the rotation direction of the rotation body, and rotates the input shaft in the blind upward rotation direction. On the other hand, when the rotating body rotates via the one-way clutch spring, the stopper protrudes in the radial direction and engages with the fixed portion to prevent the rotation of the internal gear, so that the input shaft rotates in the blind downward rotation direction. On the other hand, when the rotating body is rotated via the one-way clutch spring, the stopper is disengaged from the fixed portion and allows the integral rotation with the input shaft of the internal gear.

  According to a fifth aspect of the present invention, the first clutch mechanism according to the second aspect is configured to rotate integrally with the input shaft and slidable in the axial direction according to the rotation direction of the input shaft, and the shaft together with the alternator. A first ratchet that is slidable in the direction and cannot be rotated, and a second ratchet that is provided integrally with the internal gear and that can mesh with the first ratchet, and the direction of the blind ascending rotation of the input shaft The rotation of the alternator causes the first ratchet to move toward the second ratchet to engage the first ratchet and the second ratchet, thereby preventing the internal gear from rotating, and the input shaft blind. The alternator slides with respect to the rotation in the downward rotation direction to separate the first ratchet and the second ratchet, thereby allowing the rotation of the internal gear.

  According to the present invention, when the rotation in the blind rising rotation direction is transmitted to the input shaft by the operation of the operation unit, the rotation decelerated by the planetary gear mechanism is output to the output shaft. As a result, an operation load required for the operation unit is reduced, a light operation feeling is obtained, and even a weak user can easily perform the operation. On the other hand, when the rotation in the blind downward rotation direction is transmitted to the input shaft by the operation of the operation unit, all the components of the planetary gear mechanism rotate integrally, so the function of the planetary gear mechanism itself is invalidated and output. The shaft is rotated at the same speed as the input shaft. As a result, since the planetary gear mechanism is switched to the same state as when no planetary gear mechanism is present, the lowering speed of the shielding material is not delayed, and the shielding material can be lowered at a speed faster than that during the ascending operation. A feeling of operation is obtained.

Thus, by switching between the ascending operation and the descending operation, a light operational feeling can be obtained in any operation.
Further, by using the planetary gear mechanism, it can be configured at a low cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a blind lifting device according to the present invention, and FIG. 2 is an exploded perspective view thereof.

  The blind lifting / lowering device 10 is disposed in the upper support member of the blind. The upper support member of the blind supports the shielding material of the blind, and in general horizontal blinds, pleated screens, roman shades, etc., a head box that supports the shielding material via a lifting cord or a ladder cord. In the roll screen, the upper end of the shielding material is wound up, and a winding pipe connected so as to be unwound corresponds. However, the present invention is not limited to this.

  The blind lifting and lowering device 10 includes a fixed substantially cylindrical fixed case 20 attached to the upper support member or another fixed member, and a fixed case lid attached to an output side end of the substantially cylindrical fixed case 20. 22 and any one of two rotation directions, a blind ascending rotation direction corresponding to a blind ascending direction and a blind descending rotation direction corresponding to a blind descending direction, which are generated by an operation of a blind operating unit that performs the raising and lowering operation of the blind. An input shaft 24 to which rotation in the rotation direction is selectively transmitted and an output shaft 26 connected to the lifting shaft for lifting and lowering the shielding material are provided.

  In the illustrated example, the operation unit is an operation cord 12, and the operation cord 12 is wound around a pulley 14. Depending on the operation direction of the operation cord 12, the pulley 14 can rotate in two directions opposite to each other, and these two directions correspond to the blind upward rotation direction and the blind downward rotation direction. The input shaft 24 is connected to the pulley 14 so as to be concentric and integrally rotatable.

  The output shaft 26 is concentrically connected to the elevating shaft 16 by a connecting sleeve 18 and a screw 19. The hoisting shaft 16 is formed by winding the upper end of the hoisting cord so that it can be unwound and connected so as to be unwound, or the winding drum is integrally connected, or in the case of a roll screen, It can be integrally connected to the pipe itself or the take-up pipe.

  The input shaft 24 extends through the input-side end of the fixed case 20 in the axial direction of the device 10, and a gear is formed in the middle of the input shaft 24. This gear is a planetary gear mechanism 30 described later. It becomes the sun gear 36 which comprises. At the same time, the input shaft 24 is connected to the planetary gear mechanism 30 via the first clutch mechanism 32 and is connected to the planetary gear mechanism 30 via the second clutch mechanism 34.

  The planetary gear mechanism 30 is formed on the inner peripheral side of the sleeve 42 by meshing with the planetary gear 38 and the planetary carrier 40 that supports the planetary gear 38 that meshes with the sun gear 36 that is formed on the input shaft 24. An internal gear 44. The sleeve 42 is rotatable in sliding contact with the inner surface of the fixed case 20 in the fixed case 20, and a small diameter portion 42 a extending to the first clutch mechanism 32 is extended on the input shaft side. The small-diameter portion 42a has an outer cylindrical portion 42b on the outer side, and an inner cylindrical portion 42c is formed concentrically on the inner side of the outer cylindrical portion 42b. The outer cylinder part 42b is formed with two notches 42d in the circumferential direction, and the inner cylinder part 42c is formed with two notches 42e at intervals of 180 degrees in the circumferential direction. .

  The first clutch mechanism 32 includes a one-way clutch spring 48 wound around the outer periphery of the input shaft 24, a rotating body 50 disposed on the outer peripheral side of the one-way clutch spring 48, and a rotation direction of the rotating body 50. A stopper 52 that can be projected and retracted in the radial direction and a plurality of gear grooves 20 a formed on the inner peripheral surface of the fixed case 20 are provided.

  The one-way clutch spring 48 is provided between the input shaft 24 and the rotating body 50, and one end thereof is formed on the outer peripheral surface of the input shaft 24 and the other end is formed at one place in the circumferential direction of the rotating body 50. It is inserted into the longitudinal groove 50a.

  The rotating body 50 is formed with two extending portions 50b and 50c extending in the output shaft direction, and the extending portion 50c is formed with the longitudinal groove 50a extending. The extended portions 50b and 50c are inserted into cutout portions 42e formed in the inner cylinder portion 42c of the small diameter portion 42a of the sleeve 42.

  The stopper 52 is formed in the sleeve 42 so as to be able to protrude and retract from one notch portion 42d formed in the outer cylinder portion 42b between the outer cylinder portion 42b and the inner cylinder portion 42c of the small diameter portion 42a of the sleeve 42. And is connected to the sleeve 42. A receiving groove 52 a into which the extended portion 50 b of the rotating body 50 is inserted is formed inside the stopper 52. In addition, an engagement tooth 52b that can mesh with the gear groove 20a of the fixed case 20 is formed at the protruding end of the stopper 52 from the notch 42d.

  In the first clutch mechanism 32 configured as described above, when the rotation in the blind ascending rotation direction (counterclockwise rotation in FIG. 3) is input from the input shaft 24, the one-way clutch spring 48 is As shown in FIG. 3, the rotating body 50 is rotated in the same direction, and the stopper 52 is moved. As a result, the stopper 52 protrudes from the sleeve 42 and its meshing teeth 52b mesh with one of the gear grooves 20a of the fixed case 20, so that the stopper 52 cannot rotate. Thereby, the rotation of the sleeve 42 is prevented. Also, the one-way clutch spring 48 is relaxed when the rotation is prevented, and only the input shaft 24 is allowed to rotate. On the other hand, when the rotation in the blind downward rotation direction (clockwise rotation in FIG. 4) is input from the input shaft 24, the rotating body 50 is moved in the same direction via the one-way clutch spring 48 as shown in FIG. And the stopper 52 is moved. As a result, the stopper 52 is retracted into the sleeve 42, and the sleeve 42 rotates together with the input shaft 24.

  Next, the second clutch mechanism 34 includes a one-way clutch spring 54 wound around the outer periphery of the input shaft 24.

  The one-way clutch spring 54 is provided between the input shaft 24 and the planet carrier 40. One end of the one-way clutch spring 54 is provided on the outer peripheral surface of the input shaft 24, and the other end is provided at one circumferential position on the inner peripheral surface of the planet carrier 40. It is inserted into the longitudinal groove 40a formed in the above.

  In the second clutch mechanism 34 configured as described above, when the rotation in the blind ascending rotation direction from the input shaft 24 is input, the second clutch mechanism 34 relaxes and rotates the planet carrier 40 relative to the input shaft 24. When the rotation in the blind downward rotation direction from the input shaft 24 is input, the planetary carrier 40 is rotated integrally with the input shaft 24 by being tightened.

  Further, a clutch spring 56 is wound around the outer periphery of the boss portion 22 a formed on the fixed case lid 22. Both ends of the clutch spring 56 are disposed in a notch 26b (see FIG. 2) formed in an outer peripheral portion 26a formed integrally with the output shaft 26, and extend in the output shaft direction of the planetary carrier 40. It arrange | positions at the both sides of the part 40b.

  In this clutch spring 56, the output shaft 26 is rotated in the same direction together with the planet carrier 40 by being relaxed with respect to any rotation direction from the planet carrier 40 in the blind upward rotation direction and the blind downward rotation direction. The rotation of the output shaft 26 and the planetary carrier 40 is prevented by being fastened to the fixed case lid 22 against any rotational force from the output shaft 26.

The operation of the blind lifting and lowering device configured as described above will be described.
When not in operation, the rotational force in the blind lowering direction transmitted to the output shaft 26 via the elevating shaft 16 due to its own weight acting on the shielding material is received by the fixed case lid 22 via the clutch spring 56. Since the rotation of the elevating shaft 16 is prevented, the shielding material is stopped at a desired height.

  When the operation cord 12 is operated in the corresponding operation direction to raise the shielding material from this state, the rotation in the blind ascending rotation direction is transmitted from the pulley 14 to the input shaft 24, and the operation of the first clutch mechanism 32 is performed. As shown in FIG. 3, the stopper 52 is prevented from meshing with the gear groove 20 a of the fixed case 20, so that the rotation of the sleeve 42 is prevented. Further, in the second clutch mechanism 34, the planet carrier 40 is allowed to rotate. Therefore, in the planetary gear mechanism 30, since the internal gear 44 is fixed, as shown in FIG. 5, the planetary gear 38 revolves around the sun gear 36 formed on the input shaft 24 while rotating, and the planetary gear 38 rotates. The planetary carrier 40 rotates while decelerating at a reduction ratio corresponding to the gear ratio of the gear mechanism 30. The reduced rotation of the planet carrier 40 is output to the output shaft 26 and the lifting shaft 16 via the clutch spring 56.

  Due to the deceleration operation of the planetary gear mechanism 30 described above, the operation load is reduced during the ascending operation, a light operation feeling is obtained, and even a powerless user can easily perform the operation.

  On the other hand, when the operation cord 12 is operated in the corresponding operation direction to lower the shielding material, the rotation in the blind lowering rotation direction is transmitted from the pulley 14 to the input shaft 24, and the operation of the first clutch mechanism 32 described above causes As shown in FIG. 4, since the stopper 52 is retracted into the sleeve 42, the sleeve 42 rotates integrally with the input shaft 24. In the second clutch mechanism 34, the planet carrier 40 also rotates integrally with the input shaft 24. Therefore, as shown in FIG. 6, the planetary gear mechanism 30 has a 1: 1 reduction ratio, and the planet carrier 40 decelerates. Rotate without. The rotation of the planet carrier 40 is output to the output shaft 26 and the lifting shaft 16 via the clutch spring 56.

  As described above, at the time of the lowering operation, the state is switched to the same state as when the planetary gear mechanism 30 is not present, so that the lowering speed of the shielding material is not delayed and a light operation feeling is obtained.

  Thus, by switching between the ascending operation and the descending operation, a light operational feeling can be obtained in any operation.

  7 and 8 are longitudinal half sectional views showing a second embodiment of the blind lifting device according to the present invention. In the second embodiment, the same or similar members / parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the first clutch mechanism 32-1 rotates integrally with the input shaft 24 and is slidable in the axial direction according to the rotation direction of the input shaft 24, and is adjacent to the alternator 62. The first ratchet 64 that is slidable in the axial direction together with the alternator 62 but cannot be rotated by the fixed case 20 and the first ratchet 64 that is formed on the input shaft side of the sleeve 42 can be engaged with the first ratchet 64. A second ratchet 66.

  The alternator 62 is formed with two endless grooves 62a and 62b endlessly spaced on the outer periphery thereof, and the endless grooves 62a and 62b are connected by a connecting groove 62c. And the ball 63 inserted in the half hole 20b formed in the inner peripheral surface of the fixed case 20 can roll relatively in the endless groove. Although the position of the ball 63 is fixed, when the alternator 62 rotates in the blind upward rotation direction, the ball 63 rolls in the endless groove 62b, and the alternator 62 slides in the axial direction toward the output shaft in the fixed case 20. Move. On the other hand, when the alternator 62 rotates in the blind downward rotation direction, the ball 63 passes through the connecting groove 62c and rolls in the endless groove 62a. Thus, the alternator 62 is positioned on the input shaft side while rotating in the blind downward rotation direction.

  The first ratchet 64 is always urged toward the alternator 62 by a pressing spring 68 inserted between the first ratchet 66 and the second ratchet 66. Therefore, when the alternator 62 is located on the input shaft side, the first ratchet 64 is separated from the second ratchet 66, and when the alternator 62 is located on the output shaft side, the first ratchet 64 and the second ratchet 64 are separated. The ratchets 66 are in close contact and mesh with each other.

  In the first clutch mechanism 32-1 configured as described above, when rotation in the blind ascending rotation direction is input from the input shaft 24, the alternator 64 slides toward the output shaft side to The ratchet 64 and the second ratchet 66 mesh with each other, and the sleeve 42 integrated with the second ratchet 66 meshed with the non-rotatable first ratchet 64 is prevented from rotating. On the other hand, when the rotation in the blind downward rotation direction from the input shaft 24 is input, the alternator 64 is on the input shaft side, and the first ratchet 64 and the second ratchet 66 are separated from each other, and therefore the sleeve 42 is It can rotate freely.

  Also in the blind lifting and lowering device configured as described above, the rotation of the sleeve 42 is prevented during the lifting operation of the shielding material, as in the first embodiment. Is decelerated, and the rotation of the decelerated planetary carrier 40 is output to the output shaft 26 and the elevating shaft 16 via the clutch spring 56.

On the other hand, when the shielding member is lowered, the sleeve 42 is freely rotated, and the planet carrier 40 rotates integrally with the input shaft 24. Therefore, the rotation from the input shaft 24 is not decelerated, and the output shaft 26 and It is output to the lifting shaft 16.
In this way, the same operation and effect as in the first embodiment can be provided.

  The configuration of the clutch mechanism including the first clutch mechanism and the second clutch mechanism in each of the above embodiments is an example, and the rotation of the input shaft 24 is transmitted with respect to the rotation of the input shaft 24 in the blind ascending rotation direction. Any component other than the component of the planetary gear mechanism to be fixed is fixed, the reduced rotation is transmitted to the remaining other components connected to the output shaft 26, and the blind downward rotation of the input shaft 24 is performed. As long as the rotation of the input shaft 24 is transmitted to all the components of the planetary gear mechanism with respect to the rotation in the direction, and the output shaft 26 is switched to transmit the rotation at the same speed as the input shaft 24, Any configuration can be adopted.

It is a longitudinal section showing a 1st embodiment of a raising and lowering device of a blind by the present invention. It is a disassembled perspective view of the blind raising / lowering apparatus of 1st Embodiment. It is sectional drawing seen along the 3-3 line | wire of FIG. 1 at the time of blind raising operation. It is sectional drawing seen along the 3-3 line | wire of FIG. 1 at the time of blind descent | fall operation. It is sectional drawing seen along the 5-5 line | wire of FIG. 1 at the time of blind raising operation. It is sectional drawing seen along the 5-5 line | wire of FIG. 1 at the time of blind descent | fall operation. It is a longitudinal half sectional view showing 2nd Embodiment of the raising / lowering apparatus of the blind by this invention, and represents the time of blind raising operation. It is a longitudinal half sectional view showing 2nd Embodiment of the raising / lowering apparatus of the blind by this invention, and represents the time of blind lowering operation. It is sectional drawing seen along the 9-9 line | wire of FIG. 8 at the time of blind raising operation.

Explanation of symbols

10 Blind Lifting Device 12 Operation Code (Operation Unit)
16 Elevating shaft 20a Gear groove (fixed part)
24 Input shaft 26 Output shaft 30 Planetary gear mechanisms 32, 32-1 First clutch mechanism (clutch mechanism)
34 Second clutch mechanism (clutch mechanism)
36 Sun gear (first component)
40 Planet carrier (second component)
44 Internal gear (third component)
48 One-way clutch spring 50 Rotating body 52 Stopper 54 One-way clutch spring 62 Alternator 64 First ratchet 66 Second ratchet

Claims (5)

Rotation in one of the two rotation directions of the blind ascending rotation direction corresponding to the blind ascending direction and the blind descending direction corresponding to the blind descending direction which are selectively generated by the operation of the operation unit (12) is transmitted. A blind lifting and lowering device including an input shaft (24) to be operated and an output shaft (26) connected to a lifting shaft (16) for lifting and lowering the shielding material,
A first component (36) to which rotation of the input shaft (24) is transmitted, a second component (40) to transmit rotation to the output shaft (26), and a third component (44) A planetary gear mechanism (30) capable of transmitting reduced rotation from the first component (36) to the second component (40);
The third component (44) is provided between the input shaft (24) and the planetary gear mechanism (30), and the third component (44) cannot rotate with respect to the rotation of the input shaft (24) in the blind ascending rotation direction. Transmission of reduced rotation from the first component (36) to the second component (40) and rotation of the input shaft (24) with respect to rotation of the input shaft (24) in the blind downward rotation direction. A clutch mechanism (32, which is transmitted to all the components (36, 40, 44) of the planetary gear mechanism (30) and is switched to transmit the rotation at the same speed as the input shaft (24) to the output shaft (26). 32-1, 34),
A blind lifting and lowering device comprising: The first component of the planetary gear mechanism (30) is a sun gear (36), the second component is a planet carrier (40) that supports the planetary gear, and the third component is an internal gear (44),
The clutch mechanism disables the rotation of the internal gear (44) with respect to the rotation of the input shaft (24) in the blind upward rotation direction, and the internal gear (44) with respect to the rotation of the input shaft in the blind downward rotation direction. The blind lifting and lowering device according to claim 1, further comprising a first clutch mechanism (32, 32-1) that allows the rotation of the blind.   The clutch mechanism separates the rotation of the planet carrier (40) from the input shaft (24) with respect to the rotation of the input shaft (24) in the blind ascending rotation direction, so that the input shaft (24) rotates in the blind downward rotation direction. The blind lifting and lowering device according to claim 2, further comprising a second clutch mechanism (34) for rotating the planet carrier (40) integrally with the input shaft (24).   The first clutch mechanism (32) includes a one-way clutch spring (48) wound around the outer periphery of the input shaft (24) and a one-way clutch disposed on the outer peripheral side of the one-way clutch spring (48). A rotating body (50) to which the rotation of the spring (48) is transmitted, and a stopper (52) which is connected to the internal gear (44) and can be projected and retracted in the radial direction depending on the rotating direction of the rotating body (50). The stopper (52) protrudes in the radial direction when the rotating body (50) rotates via the one-way clutch spring (48) with respect to the rotation of the input shaft (24) in the blind ascending rotation direction. The rotating body is engaged with the fixed portion (20a) to prevent the rotation of the internal gear (44), and the rotation of the input shaft (24) through the one-way clutch spring (48) with respect to the rotation of the input shaft (24) in the blind downward rotation direction. Stopper (5) when (50) rotates ) Is the input shaft (24) and blind lifting device according to claim 2, wherein the allowing rotation of the integral of the fixing portion (20a) disengaged and become internal gear (44).   The first clutch mechanism (32-1) includes an alternator (62) that rotates integrally with the input shaft (24) and is slidable in the axial direction according to the rotation direction of the input shaft (24), and an alternator ( 62) and a second ratchet (64) that is slidable in the axial direction and non-rotatable with the internal gear (44), and is capable of meshing with the first ratchet (64). A ratchet (66), and the alternator (62) slides to rotate the first ratchet (64) toward the second ratchet (66) in response to rotation of the input shaft (24) in the blind upward rotation direction. The first ratchet (64) and the second ratchet (66) are meshed with each other to prevent the internal gear (44) from rotating, and the alternator is prevented from rotating in the blind downward rotation direction of the input shaft (24). (62) is sliding To first ratchet (64) and the second ratchet and (66) by separating, blind lifting device according to claim 2, wherein the allowing rotation of the internal gear (44).

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