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Patent Searching and Data


Title:
BIND CARRIER
Document Type and Number:
WIPO Patent Application WO/2002/016722
Kind Code:
A1
Abstract:
The object of this invention is to provide a blind carrier, designed to drive a blind winding shaft using the rotating force of a motor and to move a blind in a vertical direction. In the blind carrier, a sun gear (30) is mounted to a motor shaft (40), with planetary gears (50) externally engaging with the sun gear (30). First and second internal gears (16) and (72) of first and second housings (10) and (70) commonly and externally engage with the planetary gears (50). A driven shaft (76), extending from the second housing (70), is connected to the blind winding shaft. The first housing (10) is fixed to a casing, and so the motor shaft (40) is prevented from undesirably rotating. In addition, the blind carrier can achieve a desired high reduction gear ratio by controlling the number of teeth of the first and second internal gears (16) and (72).

Inventors:
LEE KAE-WON (KR)
Application Number:
PCT/KR2000/001149
Publication Date:
February 28, 2002
Filing Date:
October 14, 2000
Export Citation:
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Assignee:
KOIN IND CO LTD (KR)
LEE KAE WON (KR)
International Classes:
E06B9/40; A47H5/00; E06B9/42; E06B9/68; (IPC1-7): E06B9/68
Foreign References:
JPH0487995U1992-07-30
KR850004296A1985-07-11
KR930019962U1993-09-24
JPS59167298U1984-11-09
JPS563994U1981-01-14
Attorney, Agent or Firm:
Kim, Eun-gu (Yoksam-dong, Kangnam-gu 135-080 Seoul, KR)
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Claims:
Claims
1. A blind carrier which is connected to the driving shaft of the motor and moves a blind in a vertical direction by driving a blind winding shaft, comprising: a sun gear mounted to said driving shaft of the motor; a singlestage planetary gears externally engaged with said sun gear; the first housing having the first internal gear which is internally engaged with one end part of the tooth width of each planetary gear of said planetary gears, and which has the central axis coinciding with that of said driving shaft,; the second housing having the second internal gear which is internally engaged with the other end part of the tooth width of each planetary gear of said planetary gears, and which has the central axis coinciding with that of said driving shaft; and a driven shaft extending from said second housing connected to said blind winding shaft.
2. The blind carrier according to claim 1, wherein said first housing is fixed at the case of said first housing equipped at or around a blind head for no rotation.
3. The blind carrier according to claims 2 to 3, wherein the number of the teeth of said first internal gear is different from that of said second internal gear.
4. The blind carrier according to claims 1 to 2, wherein each planetary gear of said planetary gears has a circular hole at the center to be fitted loosely in each protrusion bar; said each protrusion bar is fitted tightly in each marginal hole of a rotating plate which has also a central hole; and said rotating plate is fitted loosely in protrusion shaft formed as one body in the inside of the second housing.
5. The blind carrier according to claim 3, wherein each planetary gear of said planetary gears has a circular hole at the center to be fitted loosely in each protrusion bar; said each protrusion bar is fitted tightly in each marginal hole of a rotating plate which has also a central hole; and said rotating plate is fitted loosely in protrusion shaft formed as one body in the inside of the second housing.
6. The blind carrier according to claim 5, wherein said first housing has a stopping hill inside thereof; said second housing is inserted into the inside of said first housing; said driven shaft is inserted into the central hole of a diskshaped cover; and said diskshaped is connected with said first housing by means of a connecting member.
Description:
BLIND CARRIER Technical Field The present invention relates to the blind carrier which is designed to drive a blind winding shaft using the rotating force of a motor and to move a blind in a vertical direction.

Background Art Conventional blind carrier using an electric motor used a planetary gear and a bevel gear, a spur gear.

In conventional carrier, a blind winding shaft would tend to be rotated reversibly because of the load of the blind and the blind move downwardly when the blind was lifted. Thus, a motor shaft needed an apparatus for protecting a reverse rotation. Although the apparatus was existed, the apparatus is retired or exchanged because of the aging.

Also, if the blind is folded and unfolded slowly and smoothly, a reduction gear ratio must be high. Therefore, the conventional carrier had a problem that a structure was complex and the cost of production was high because of having the multistage planetary gears for high reduction gear ratio.

Disclosure of the Invention Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a blind carrier having a sun gear and, the single-stage planetary gears, the first housing having the first internal gear, the second housing having the second internal gear. Thus, there earns reduction gear ratio as high as or higher than that of the multistage planetary gears although a single-stage planetary gear is used. There protects the reverse rotation of a blind winding shaft without an

apparatus for protecting a reverse rotation.

In order to accomplish the above object, a blind carrier which is connected to the driving shaft of the motor and moves a blind in a vertical direction by driving a blind winding shaft, comprises: a sun gear mounted to the driving shaft of the motor; a single-stage planetary gears externally engaged with the sun gear; the first housing having the first internal gear which is internally engaged with one end part of the tooth width of each planetary gear of the planetary gears, and which has the central axis coinciding with that of the driving shaft,; the second housing having the second internal gear which is internally engaged with the other end part of the tooth width of each planetary gear of the planetary gears, and which has the central axis coinciding with that of the driving shaft; and a driven shaft extending from the second housing connected to the blind winding shaft.

In the above blind carrier, the first housing is fixed at the case of the first housing equipped at or around a blind head for no rotation.

In the above blind carrier, the number of the teeth of the first internal gear is different from that of the second internal gear.

In the above blind carrier, there is provided a blind carrier comprising; each planetary gear of the planetary gears has a circular hole at the center to be fitted loosely in each protrusion bar; each protrusion bar is fitted tightly in each marginal hole of a rotating plate which has also a central hole; and the rotating plate is fitted loosely in protrusion shaft formed as one body in the inside of the second housing.

In the above blind carrier, there is provided a blind carrier comprising; each planetary gear of said planetary gears has a circular hole at the center to be fitted loosely in each protrusion bar; the each protrusion bar is fitted tightly in each marginal hole of a rotating plate which has also a central hole; and the rotating plate is fitted loosely in protrusion shaft formed as one body in the inside of the second housing.

In the above blind carrier, there is provided a blind carrier comprising; the first housing has a stopping hill inside thereof; the second housing is inserted into the inside of the first housing; the driven shaft is inserted into the central hole of a disk-shaped cover; and the disk-shaped is connected with the first housing by means of a connecting member.

The blind carrier in accordance with the present invention can be used in a curtain and a stage-curtain, a partition, a shutter and so on. In these cases, the title of the present invention can be called a curtain carrier and a stage-curtain, a partition carrier, a shutter carrier and so on.

The characteristic of the present invention is that the first housing is fixed and, the number of tooth of the first internal gear is different from its second internal gear and, one end and the other of tooth width of the planetary gears commonly connects with the sun gear and the first internal gear and, the second internal gear each other.

The first effect of the present invention is that the second housing and the driven shaft extending from the second housing rotate as the sun gear mounted to the driving shaft of the motor rotates, but the sun gear mounted to the driving shaft of the motor doesn't rotate as the driven shaft extending from the second housing rotates. This is because of the first housing being fixed.

The second effect of the present invention is that the deceleration is dependent on not only a velocity which the sun gear rotates in and a velocity which the planetary gears revolve around the sun gear, but also the difference of the number of tooth of the first and the second internal gear, so the reduction ration in the single-stage planetary gears larger than it in multistage planetary gears.

Because one end of tooth width of the planetary gears commonly connects with the sun and the first internal gear and, the other of it commonly connects with the second internal gear and, the number of tooth of the first internal gear is different from it.

Brief Description of the Drawings The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 is an exploded, perspective view of a blind carrier in accordance with an embodiment of the present invention; Fig. 2 is a sectional view of a blind carrier in accordance with an embodiment of the present invention; Fig. 3 is a sectional view of a sun gear assembled with two planetary gears showing the prevention of reverse rotation; Fig. 4 is a partially cutaway exploded, perspective view of a blind case and a blind head within which a blind carrier in accordance with the fourth embodiment of the present invention are contained.

Best Mode for Carrying Out the Invention Reference now should be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components.

Referring to Fig. 1, a blind carrier 8 has a first housing 10, a sun gear 30,

two planetary gears 50, a rotating plate 60, a second housing 70, and a cover of the first housing 10.

Referring to Fig. 1 and 4, One end of the first housing 10 which is cylindrical is closed toward the direction of a motor (m) (sometime this direction is said right) and open toward the direction of the rotating plate 60) (sometime this direction is said left). The first housing 10 is contained within a blind head 110 or a case 112 for the first housing 10 provided around the blind head 110. There has such as a window frame around the blind head 110.

Referring to Fig. 1, the first housing 10 has an insert hole 12 for the sun gear 30 at the center of one end thereof. Also the first housing 10 has other hole 14 around the insert hole 12 outwardly. The first housing 10 is connect with the motor (M) by means of a screw engaged through the hole 14.

Inside the first housing 10, there has a first internal gear 16 of which the number and the location of a tooth is about 48 and, at and around one end toward the direction of the rotating plate 60. One end of the first internal gear 16 toward the direction of a motor (m) has a stopping hill 18. There has a first screw hole 20 at one end of sidewall of the first housing 10 toward the direction of the rotating plate 60 so as to connect with the following a cover 80 of a driven shaft 76.

The sun gear 30 is mounted to the driving shaft 40 of the motor (M) and axially extended through the insert hole 12. The number of the tooth of the sun gear 30 is about 10.

Each planetary gear of two planetary gears 50 commonly engages with the sun gear 30 and the internal gear 16 at one end toward the direction of the rotating plate 60. As shown in Figs. 2 and 3, the sun gear 30 is positioned at the center of a rotating axis. The planetary gears 50 are positioned around the sun gear 30 and in turn the first internal gear around the planetary gears 50 diametrically and continuously. In other words, The number of tooth of each planetary gear of two planetary gears 50is about 20. Each planetary gear of two planetary gears 50 has a circular hole at the center with which a first bearing bush 52 makes a tight fit.

Referring to Fig. 1, the rotating plate 60 has a circular hole at the center

with which a second bearing bush 62 makes a tight fit. A number of hole 64 are positioned around a circular hole and make a tight fit with protrusions 66. The protrusion 66 makes a loose fit with the first bearing bush 52.

One end of the second housing 70 which is cylindrical is closed toward the direction of a motor (m) and open toward the direction of the rotating plate 60.

A second internal gear 72, which the number of tooth is about 50, is provided at an inside wall of the second housing 70. A shaft 74 is projected from a open surface and extended toward the rotating plate 60 at the center of the second housing 70.

A driven shaft 76 is projected from a closed surface and extended toward the disk- shaped cover 80. The length (d) of the second internal gear 72 is slightly more than the sum of the teeth width (b) of the planetary gears 50 and the thickness of the rotating plate 60.

The shaft 74 of the second housing 70 makes a loose fit with the second bearing bush 62 with which the central hole of the rotating plate 60 makes a tight fit. The length (d) of the second internal gear 72 is slightly more than the sum of the teeth width (b) of the planetary gears 50 and the thickness of the rotating plate 60 so that the second internal gear 72 can commonly engage with a tooth of a sidewall of the planetary gear 50.

The driven shaft cover or second housing cover 80 is disk-shaped and has a hole at the center with which the third bearing bush 82 makes a tight fit. The third bearing bush 82 makes a loose fit with a driven shaft formed with the second housing 70 as one body. In this case, the first screw hole 20 of the first housing 10 connects with a second screw hole 84 by means of a screw (not shown in Figs).

The operation of the above embodiment of the present invention will be described in detail in the bellow.

At first, the motor rotates so that the sun gear 30 joined with the driven shaft 40 as one body can rotate. As the sun gear 30 rotates, two planetary gears 50 which commonly connect with the sun gear 30 and the first internal gear 16, the second gear 72. At that time, each planetary gear of two planetary gears 50 revolves around the sun gear 30 and rotates its axis at the same time. When each planetary gear of two planetary gears revolves, it smoothly rotates without

eccentricity because it is inserted on protrusion 66 of the rotating plate 60 and opposed to each other.

During the planetary gears revolve around the sun gear 30 one time, the sum of joined tooth of the planetary gears 50 and the first internal gear 16 comes to the same of the number of tooth of the first internal gear 16. Therefore, during the planetary gears 50 revolves around the sun gear 30 one time, the sum of joined tooth of the planetary gears 50 and the second internal gear 72 comes to the same of the number of tooth of the first internal gear 16. Finally the second internal gear 72 rotates in exact proportion to the difference of the number of tooth of the first and the second internal gear.

If a rotating velocity and the number of tooth of the sun gear is also N, and Z,, a revolving velocity of the planetary gears 50 Np, the number of tooth of the first internal gear Z,, a rotating velocity and the number of tooth of the second internal gear N2andZ2, we can now write Np and N2 in the following expressions (1) and (2).

Thus we can write the reduction ration of the sun gear 30 and the second gear 72 (N2/Ns) in the next expression (3).

In this embodiment, it is known that the reduction ration obtains 1/145 from expression (3).

The second internal gear rotates so that the second housing 70 can do. In turn, the driven shaft 76 of the second housing 70 rotates so that the blind winding shaft can be rotated.

In the bellow, it's described of operation in case of rotation of the driven shaft 76.

If the driven shaft 76 rotates the driving shaft 40, the driven shaft 76 is torqued and so the planetary gears 50 must revolves around the sun gear 30 and rotate its axis.

When the driven shaft 76 is torqued, an operating condition of the planetary gears is described in the following.

Fig. 3 shows a pitch circle of the sun gear 30 and the planetary gears 50.

As the driven shaft 76 is torqued, the contact surface of the planetary gear 50 contacting with the second internal gear 72 is forced. Then, the instantaneous center of the planetary gear 50 is the point Ps. Thus, the part corresponding to the point Pp must be able to rotate on the point P, for the planetary gear 50's rotating.

By the way, as the part of left width of the planetary gear 50 corresponding to the point Pp also contacts with the first internal gear 16, the first internal gear 16 must rotate for the planetary gear 50's rotating. However, as the first internal gear 16 is fixed, the planetary gear 50 can't rotate. Thus, as the driving shaft of motor 40 doesn't rotate in spite of the driven shaft 76 being torqued, the blind carrier doesn't rotate reversely in spite of the blind's weight.

Although the present invention is described in detail referring to the above embodiment, the present invention is not limited to the above embodiment.

For example, although the first housing 10 is described to have cylindrical shape, it may have tetragonal or hexagonal shape. Also, although the left end of the first housing 10 is described to be closed, it may be open. In this case, the motor (M) must be fixed by other apparatus.

The first internal gear 16 is provided at one right end or around the center of the first housing 10. In case the first internal gear 16 is formed at the right end of it, screw holes of the first housing 20 and the second housing cover 80 does not need. In this case, it's needed that the centers of the driven shaft 40 and the driven shaft 76 be unified and another means for preventing from separating the first and the second housing 10 and 70.

Although the stopping hill 16 is provided inside of the first internal gear 16 in the above embodiment, it is not needed in case the second housing 70 is not inserted through the first housing 10. Also, in this case the stopping hill 16 is not always located at one end of the first internal gear 16.

Although the number of the planetary gears 50 is 2 in the above embodiment, it can be more than 1 and preferably 2-3.

Although the above embodiment has the rotating plate 80, the present invention may not have it. In this case, the second housing 70 can have no the shaft 74 for protrusion and each planetary gear of the planetary gears 50 can have no holes.

In the above embodiment, although the second housing 70 is described to have cylindrical shape, it may have tetragonal or hexagonal shape and so on.

Also, although the right end of the second housing 70 is described to be closed, it may be open. In this case, the driven shaft 76 connects with the second housing 70 as one body.

Although the second housing 70 is inserted into inside of the first housing 10, one is not or partially inserted into and makes a contact with the other. In this case, the present invention does not need the screw hole 20 of the first housing 10 and the second housing cover 80. Also, another means for preventing from separating the first and the second housing 10 and 70 may be needed.

Although the number of tooth of the sun gear 30 and the first internal gear 48, the second internal gear 70 is 10 and 48,50, the present invention is not limited to these number and can have a alternative of another combination.

Although the first housing 10 is fixed, the present invention may not be fixed. However, in this case, it may have a disadvantage of not preventing from rotating.