CA2368336A1 - Concealed type venetian blind lifting control mechanism - Google Patents
Concealed type venetian blind lifting control mechanism Download PDFInfo
- Publication number
- CA2368336A1 CA2368336A1 CA002368336A CA2368336A CA2368336A1 CA 2368336 A1 CA2368336 A1 CA 2368336A1 CA 002368336 A CA002368336 A CA 002368336A CA 2368336 A CA2368336 A CA 2368336A CA 2368336 A1 CA2368336 A1 CA 2368336A1
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- CA
- Canada
- Prior art keywords
- lift cord
- venetian blind
- roll
- control mechanism
- lift
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
- E06B9/26—Lamellar or like blinds, e.g. venetian blinds
- E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
- E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
- E06B9/32—Operating, guiding, or securing devices therefor
- E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Blinds (AREA)
Abstract
A concealed type Venetian blind lifting control mechanism is constructed to include a lift cord roll-up unit, the lift cord roll-up unit including a transmission shaft, two lift cord roll-up members synchronously rotated with the transmission shaft to roll up/let off the lift cords of the Venetian blind, and two stop members fixedly mounted on the transmission shaft, and a lift cord lock adapted to lock the transmission shaft. The lift cord lock includes a second stop member, two stop rods moved with the second stop member relative to the stop members of the lift cord roll-up unit to lock/unlock the transmission shaft, and spring member, which supports the second stop member in the engagement position.
Description
CONCEALED TYPE VENETIAN BLIND LIFTING CONTROL
MECHANISM
FIELD OF THE INVENTION
The present invention relates to Venetian blinds and, more specifically, to a concealed type Venetian blind lifting control mechanism, which keeps the ends of the lift cords of the Venetian blind from sight.
BACKGROUND OF THE INVENTION
A window may be provided with a Venetian blind that can be opened or closed to regulate the light, air, etc. A regular Venetian blind comprises headrail, a blind formed of a set of slats and a bottom rail and suspended from the headrail, a lifting control mechanism adapted for controlling the lifting of the blind, and a tilt control mechanism adapted for tilting the slats to regulate the light.
The lifting control mechanism comprises an external lift cord, a slat lift cord, and a lift lock. The external lift card is suspended from the headrail of the Venetian blind at one lateral side of the slats for pulling by hand. The slat lift cord is inserted through the slats and connected between the bottom rail of the blind and one end of the external lift cord.
The user can pull the external lift cord to move the slat lift cord, and to further control the elevation of the blind. Pulling the external lift cord can simultaneously move the lift lock between the locking position and the unlocking position. Therefore, the user can adjust the blind to the desired elevation by means of operating the external lift cord. Because the external lift cord is suspended from the headrail of the blind at one side of the slats, it is conveniently accessible. However, because the external lift cord is not kept out of reach of children, children may pull the external lift cord for fun. In case the external lift cord is hung on a child's head, a fetal accident may occur: Furthermore, the external lift cord tends to be tangled with the tilt cord of the tilt control mechanism or the slats of the blind.
Taiwan Patent No. 149396 (application no. 8722193) discloses a Venetian blind lifting control mechanism, which uses a winding spring to automatically take up the external lift cord after each operation. When stopped at a particular elevation, the return force of the spring, the weight of the blind, and the friction force between thf; Lift cord and the related elements are maintained in balance, keeping the blind positioned in the desired elevation. However, because the friction force and the spring force vary with the wear extent of the related elements after a long use of the Venetian blind, the ends of the slats cannot be maintained in balance during elevation adjustment of the blind. Taiwan Patent no. 149920 (application no. 87218795) discloses a synchronizing lift cord lifting control mechanism, which enables the lift cords to be synchronously moved. However, this design is complicated, and the complicated parts of this design must be respectively installed in the headrail and bottom rail of the Venetian blind.
SUMMARY OF THE INVENTION
It is one object of the present invention to provide a. concealed type Venetian blind lifting control mechanism, which has a simple structure.
It is another object of the present invention to provide a concealed type Venetian blind lifting control mechanism, which is easy to install and safe in use.
It is still another object of the present invention to provide a concealed type Venetian blind lifting control mechanism; which keeps the blind in balance during elevation adjustment.
To achieve these objects of the present invention, the concealed type Venetian blind lifting control mechanism comprises a lift cord roll-up unit and a lift cord lock. The lift cord roll-up unit has a lift cord roll-up assembly and a spring release device, said lift cord roll-up assembly having a transmission shaft and at least one first stop member fixedly mounted on said transmission shaft, said transmission shaft having two ends respectively fastened to the lift cords of the Venetian blind and adapted for roiling up/letting ofd the lift cords, said spring release device being coupled to said transmission shaft to impart a spring release force to said transmission shaft and to drive said transmission shaft to roll up the lift cords. The lift cord lock has a second stop member which is provided with at lease one second stopping portion, said second stop member being moved between an engagement position where the at least one stopping portion is respectively forced into engagement with the at least one first member of said lift cord roll-up assembly to stop said transmission shaft from rotation, and a release position where the at least one second stopping portion of said lift cord lock is disengaged from the at least one stop member of said lift cord roll=up assembly for enabling said spring release device to rotate said transmission shaft to further roll up the lift cords.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a preferred embodiment of the present invention showing the lifting control mechanism installed in a Venetian blind.
FIG. 2 is an exploded view of the lifting control mechanism according to the preferred embodiment of the present invention.
FIG. 3 is an assembly view of the lifting control mechanism according to the preferred embodiment of the present invention.
FIG. 4 is a schematic drawing showing the engagement status of the lifting control mechanism according to the preferred embodiment of the present invention.
FIG. 5 is a schematic drawing showing the release status of the lifting control mechanism according to the preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIGS. from 1 through 3, a concealed type lifting control mechanism 10 is installed in a Venetian blind 20 for lifting control.
The Venetian blind 20 comprises a headrail 21, a blind 22, a lift cord unit 23, and a tilt rod unit 24. The headrail 21 is adapted for fastening to the topside of a window, having a mounting portion 21a,21b at each of the two distal ends thereof. The blind 22 comprises a number of slats 221 and a bottom rail 222. Each slat 221 has through holes 223 corresponding to each of the mounting portions 21a and 21b of the headrail 21. The bottom rail 222 comprises a bottom plate 224 and a cover plate 225. The cover plate 225 cover, the bottom plate 224, defining with a bottom plate 224 a receiving chamber (not shown).
The lift cord unit 23 comprises two lift cords 23a,23b each having a first end respectively fixedly connected to the mounting portions 21a,21b of the headrail 2I and a second end respectively inserted in proper order through the through holes 223 of the slats 22.
The tilt rod unit 24 couples the blind 22 to the headrail 21 and is adapted to control the tilting angle of the blind 22, determining the amount of light passing through the gaps between the slats 221.
Because the Venetian blind 20 is of the known art, no further detailed description is necessary.
Referring to FIGS. 2 and 3 again, the lifting control mechanism 10 is mounted in the receiving chamber defined by the bottom plate 224 and cover plate 225 of the bottom rail 222 of the blind 22, comprising lift cord roll-up unit 11 and a lift cord lock 12. The lift cord roll-up unit 11 comprises a. lift cord roll-up assembly 111 and a spring release device 112. The lift cord roll-up assembly 111 comprises a casing 113, a transmission shaft 114, two first stop members 115, two lift cord roll-up members 116, a barrel 117, and a limiter 118. The limiter 118 is fixedly mounted in the bottom rail 222 of the blind 22, comprising an upright block 118a disposed at one side, two guide rods 118b perpendicularly extended from one side of the upright block 118a and arranged in parallel, and two stop plates 118c perpendicularly extended from the upright block 118a and arranged in parallel between the guide rods 118b. The stop plates 118c define a receiving space 118d therebetween. The casing 113 is mounted in the receiving space 118d; having a receiving chamber 113a of a predetermined profile and a support 113b in the receiving chamber 113a.
The spring release device 112 can be a spring of constant torque, spiral spring, or the like. According to the present preferred embodiment, the spring release device 112 is a spring of constant torque mounted in the receiving chamber 113a of the casing 113 and fixedly connected with its one end to the support 113b to provide a predetermined spring release force. The transmission shaft 114 is inserted through the casing 113. The barrel 117 is coupled to the transmission shaft 1I4 and mounted in the receiving chamber 113a of the casing 113 and fixedly connected to the other end of the spring release device 112. Further, a cover plate 13 is fastened to the casing 113 to close the receiving; chamber 113a. The first stop members 115 are ratchet stop members respectively fixedly mounted on the transmission shaft lI4 at two sides of the casing 113 for synchronous rotation with the transmission shaft 114. The lift cord roll-up members 116 are respectively fixedly fastened to the ends of the transmission shaft 114 for synchronous rotation with the transmission shaft I I4, each having a spiral wire groove 119 around the periphery for rolling up the lift cords 23a,23b. The bottom ends of the lift cords 23a,23b are respectively fixedly fastened to the lift cord roll-up members 116. By means of the spring release force of the spring release device 112, the lift cord roll-up members 116 are rotated with the transmission shaft 114 to roll up the lift cords 23a,23b.
The lift cord lock 12 is mounted in the bottom rail 222 and moved relative to the limiter 118, comprising a second stop member 121, the second stop member 121 having an opening 122 greater than the area of the receiving space 118d and two recessed holes 125 respectively coupled to the guide rods 118b of the limiter 118, two springs 123 respectively mounted in the recessed holes 125 and sleeved onto the guide rods 118b of the limner 118 to force the second stop member 121 outwards from the limiter 118, and two second stopping portions 124 disposed on the second stop member 121 at two sides in the opening 122 corresponding to the first stop member 115 of the lift cord roll-up assembly 111. After installation of the lifting control mechanism 10 in the bottom rail 222 of the blind 22, the second stop member 121 of the lift cord lock 12 is partially extended to the outside of the cover plate 225 for operation by hand (see FIG. 1 ).
The operation of the present invention is outlined hereinafter with reference to FIGS. 4 and 5.
As shown in FIG. 4, when the second stop member 1'21 of the lifting mechanism 10 receives no pressure (from the user's hand), the springs 123 force the second stop member 121 outwards to the engagement position to lock lift cords 23a,23b, and therefore the blind of the Venetian blind is stopped at the desired elevation, i.e., the second stopping portions 124 are moved with the second stop member 121 outwards from the limiter 118 by the spring force of the springs 123 to the circular path of the first stop member 115 to offset the spring release force of the spring release device112, and therefore the transmission shaft 114 is stopped from rotation, and the blind is stopped at the desired elevation.
Referring to FIG. 5, when the user pressed the second stop member s 121 against the springs 123, the second stopping portions 124 are moved with the second stop member 121 away from the ftrst stop members 115 toward the limiter 118 to the release position. ,At this time, the user can move the bottom rail 222 up and down to adjust the elevation of the blind 22. In other words, the release position is to move the second stopping portions 124 away from the circular path of the first stop members 115 of the lift cord roll-up assembly 111, for enabling the spring release device 112 to rotate the barrel 117 and the transmission shaft 141 so that the lift cord roll-up members 119 can be rotated with the transmission shaft 141 to roll up or let off the lift cords 23a,23b and to further adjust the elevation of the blind 22.
When adjusting the elevation of the blind 22, the lift cord roll-up members 116 are synchronously rotated with tlhe transmission shaft 114 to roll up/let off the lift cords 23a,23b. Therefore, the blind 22 is constantly maintained in balance when lifted or lowered.
As indicated above, the present invention provides a concealed type Venetian blind lifting control mechanism, which has a simple structure, and is safe and smooth in use.
Because the lift cords are disposed in the blind and have no protruding part extended to the outside of the blind, the invention keeps the lift cords out of reach of children, preventing occurrence of accident. Because the lift cord roll-up members are synchronously rotated to roll up/let off the lift cords, the blind is constantly maintained in balance during adjustment. Further, the compact design of the concealed type Venetian blind lifting control mechanism can easily be installed in the bottom rail of the blind (alternatively, the concealed type Venetian blind lifting control mechanism can be installed in the headrail of the blind) io
MECHANISM
FIELD OF THE INVENTION
The present invention relates to Venetian blinds and, more specifically, to a concealed type Venetian blind lifting control mechanism, which keeps the ends of the lift cords of the Venetian blind from sight.
BACKGROUND OF THE INVENTION
A window may be provided with a Venetian blind that can be opened or closed to regulate the light, air, etc. A regular Venetian blind comprises headrail, a blind formed of a set of slats and a bottom rail and suspended from the headrail, a lifting control mechanism adapted for controlling the lifting of the blind, and a tilt control mechanism adapted for tilting the slats to regulate the light.
The lifting control mechanism comprises an external lift cord, a slat lift cord, and a lift lock. The external lift card is suspended from the headrail of the Venetian blind at one lateral side of the slats for pulling by hand. The slat lift cord is inserted through the slats and connected between the bottom rail of the blind and one end of the external lift cord.
The user can pull the external lift cord to move the slat lift cord, and to further control the elevation of the blind. Pulling the external lift cord can simultaneously move the lift lock between the locking position and the unlocking position. Therefore, the user can adjust the blind to the desired elevation by means of operating the external lift cord. Because the external lift cord is suspended from the headrail of the blind at one side of the slats, it is conveniently accessible. However, because the external lift cord is not kept out of reach of children, children may pull the external lift cord for fun. In case the external lift cord is hung on a child's head, a fetal accident may occur: Furthermore, the external lift cord tends to be tangled with the tilt cord of the tilt control mechanism or the slats of the blind.
Taiwan Patent No. 149396 (application no. 8722193) discloses a Venetian blind lifting control mechanism, which uses a winding spring to automatically take up the external lift cord after each operation. When stopped at a particular elevation, the return force of the spring, the weight of the blind, and the friction force between thf; Lift cord and the related elements are maintained in balance, keeping the blind positioned in the desired elevation. However, because the friction force and the spring force vary with the wear extent of the related elements after a long use of the Venetian blind, the ends of the slats cannot be maintained in balance during elevation adjustment of the blind. Taiwan Patent no. 149920 (application no. 87218795) discloses a synchronizing lift cord lifting control mechanism, which enables the lift cords to be synchronously moved. However, this design is complicated, and the complicated parts of this design must be respectively installed in the headrail and bottom rail of the Venetian blind.
SUMMARY OF THE INVENTION
It is one object of the present invention to provide a. concealed type Venetian blind lifting control mechanism, which has a simple structure.
It is another object of the present invention to provide a concealed type Venetian blind lifting control mechanism, which is easy to install and safe in use.
It is still another object of the present invention to provide a concealed type Venetian blind lifting control mechanism; which keeps the blind in balance during elevation adjustment.
To achieve these objects of the present invention, the concealed type Venetian blind lifting control mechanism comprises a lift cord roll-up unit and a lift cord lock. The lift cord roll-up unit has a lift cord roll-up assembly and a spring release device, said lift cord roll-up assembly having a transmission shaft and at least one first stop member fixedly mounted on said transmission shaft, said transmission shaft having two ends respectively fastened to the lift cords of the Venetian blind and adapted for roiling up/letting ofd the lift cords, said spring release device being coupled to said transmission shaft to impart a spring release force to said transmission shaft and to drive said transmission shaft to roll up the lift cords. The lift cord lock has a second stop member which is provided with at lease one second stopping portion, said second stop member being moved between an engagement position where the at least one stopping portion is respectively forced into engagement with the at least one first member of said lift cord roll-up assembly to stop said transmission shaft from rotation, and a release position where the at least one second stopping portion of said lift cord lock is disengaged from the at least one stop member of said lift cord roll=up assembly for enabling said spring release device to rotate said transmission shaft to further roll up the lift cords.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a preferred embodiment of the present invention showing the lifting control mechanism installed in a Venetian blind.
FIG. 2 is an exploded view of the lifting control mechanism according to the preferred embodiment of the present invention.
FIG. 3 is an assembly view of the lifting control mechanism according to the preferred embodiment of the present invention.
FIG. 4 is a schematic drawing showing the engagement status of the lifting control mechanism according to the preferred embodiment of the present invention.
FIG. 5 is a schematic drawing showing the release status of the lifting control mechanism according to the preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIGS. from 1 through 3, a concealed type lifting control mechanism 10 is installed in a Venetian blind 20 for lifting control.
The Venetian blind 20 comprises a headrail 21, a blind 22, a lift cord unit 23, and a tilt rod unit 24. The headrail 21 is adapted for fastening to the topside of a window, having a mounting portion 21a,21b at each of the two distal ends thereof. The blind 22 comprises a number of slats 221 and a bottom rail 222. Each slat 221 has through holes 223 corresponding to each of the mounting portions 21a and 21b of the headrail 21. The bottom rail 222 comprises a bottom plate 224 and a cover plate 225. The cover plate 225 cover, the bottom plate 224, defining with a bottom plate 224 a receiving chamber (not shown).
The lift cord unit 23 comprises two lift cords 23a,23b each having a first end respectively fixedly connected to the mounting portions 21a,21b of the headrail 2I and a second end respectively inserted in proper order through the through holes 223 of the slats 22.
The tilt rod unit 24 couples the blind 22 to the headrail 21 and is adapted to control the tilting angle of the blind 22, determining the amount of light passing through the gaps between the slats 221.
Because the Venetian blind 20 is of the known art, no further detailed description is necessary.
Referring to FIGS. 2 and 3 again, the lifting control mechanism 10 is mounted in the receiving chamber defined by the bottom plate 224 and cover plate 225 of the bottom rail 222 of the blind 22, comprising lift cord roll-up unit 11 and a lift cord lock 12. The lift cord roll-up unit 11 comprises a. lift cord roll-up assembly 111 and a spring release device 112. The lift cord roll-up assembly 111 comprises a casing 113, a transmission shaft 114, two first stop members 115, two lift cord roll-up members 116, a barrel 117, and a limiter 118. The limiter 118 is fixedly mounted in the bottom rail 222 of the blind 22, comprising an upright block 118a disposed at one side, two guide rods 118b perpendicularly extended from one side of the upright block 118a and arranged in parallel, and two stop plates 118c perpendicularly extended from the upright block 118a and arranged in parallel between the guide rods 118b. The stop plates 118c define a receiving space 118d therebetween. The casing 113 is mounted in the receiving space 118d; having a receiving chamber 113a of a predetermined profile and a support 113b in the receiving chamber 113a.
The spring release device 112 can be a spring of constant torque, spiral spring, or the like. According to the present preferred embodiment, the spring release device 112 is a spring of constant torque mounted in the receiving chamber 113a of the casing 113 and fixedly connected with its one end to the support 113b to provide a predetermined spring release force. The transmission shaft 114 is inserted through the casing 113. The barrel 117 is coupled to the transmission shaft 1I4 and mounted in the receiving chamber 113a of the casing 113 and fixedly connected to the other end of the spring release device 112. Further, a cover plate 13 is fastened to the casing 113 to close the receiving; chamber 113a. The first stop members 115 are ratchet stop members respectively fixedly mounted on the transmission shaft lI4 at two sides of the casing 113 for synchronous rotation with the transmission shaft 114. The lift cord roll-up members 116 are respectively fixedly fastened to the ends of the transmission shaft 114 for synchronous rotation with the transmission shaft I I4, each having a spiral wire groove 119 around the periphery for rolling up the lift cords 23a,23b. The bottom ends of the lift cords 23a,23b are respectively fixedly fastened to the lift cord roll-up members 116. By means of the spring release force of the spring release device 112, the lift cord roll-up members 116 are rotated with the transmission shaft 114 to roll up the lift cords 23a,23b.
The lift cord lock 12 is mounted in the bottom rail 222 and moved relative to the limiter 118, comprising a second stop member 121, the second stop member 121 having an opening 122 greater than the area of the receiving space 118d and two recessed holes 125 respectively coupled to the guide rods 118b of the limiter 118, two springs 123 respectively mounted in the recessed holes 125 and sleeved onto the guide rods 118b of the limner 118 to force the second stop member 121 outwards from the limiter 118, and two second stopping portions 124 disposed on the second stop member 121 at two sides in the opening 122 corresponding to the first stop member 115 of the lift cord roll-up assembly 111. After installation of the lifting control mechanism 10 in the bottom rail 222 of the blind 22, the second stop member 121 of the lift cord lock 12 is partially extended to the outside of the cover plate 225 for operation by hand (see FIG. 1 ).
The operation of the present invention is outlined hereinafter with reference to FIGS. 4 and 5.
As shown in FIG. 4, when the second stop member 1'21 of the lifting mechanism 10 receives no pressure (from the user's hand), the springs 123 force the second stop member 121 outwards to the engagement position to lock lift cords 23a,23b, and therefore the blind of the Venetian blind is stopped at the desired elevation, i.e., the second stopping portions 124 are moved with the second stop member 121 outwards from the limiter 118 by the spring force of the springs 123 to the circular path of the first stop member 115 to offset the spring release force of the spring release device112, and therefore the transmission shaft 114 is stopped from rotation, and the blind is stopped at the desired elevation.
Referring to FIG. 5, when the user pressed the second stop member s 121 against the springs 123, the second stopping portions 124 are moved with the second stop member 121 away from the ftrst stop members 115 toward the limiter 118 to the release position. ,At this time, the user can move the bottom rail 222 up and down to adjust the elevation of the blind 22. In other words, the release position is to move the second stopping portions 124 away from the circular path of the first stop members 115 of the lift cord roll-up assembly 111, for enabling the spring release device 112 to rotate the barrel 117 and the transmission shaft 141 so that the lift cord roll-up members 119 can be rotated with the transmission shaft 141 to roll up or let off the lift cords 23a,23b and to further adjust the elevation of the blind 22.
When adjusting the elevation of the blind 22, the lift cord roll-up members 116 are synchronously rotated with tlhe transmission shaft 114 to roll up/let off the lift cords 23a,23b. Therefore, the blind 22 is constantly maintained in balance when lifted or lowered.
As indicated above, the present invention provides a concealed type Venetian blind lifting control mechanism, which has a simple structure, and is safe and smooth in use.
Because the lift cords are disposed in the blind and have no protruding part extended to the outside of the blind, the invention keeps the lift cords out of reach of children, preventing occurrence of accident. Because the lift cord roll-up members are synchronously rotated to roll up/let off the lift cords, the blind is constantly maintained in balance during adjustment. Further, the compact design of the concealed type Venetian blind lifting control mechanism can easily be installed in the bottom rail of the blind (alternatively, the concealed type Venetian blind lifting control mechanism can be installed in the headrail of the blind) io
Claims (11)
1. A concealed type Venetian blind lifting control mechanism installed in a Venetian blind and adapted to control the lifting of lift cords of the Venetian blind, said control mechanism comprising:
a lift cord roll-up unit, said lift cord roll-up unit having a lift cord roll-up assembly and a spring release device, said lift cord roll-up assembly having a transmission shaft and at least one first stop member fixedly mounted on said transmission shaft, said transmission shaft having two ends respectively fastened to the lift cords of the Venetian blind and adapted for rolling up/letting off the lift cords, said spring release device being coupled to said transmission shaft to impart a spring release force to said transmission shaft and to drive said transmission shaft to roll up the lift cords; and a lift cord lock having a second stop member which is provided with at lease one second stopping portion, said second stop member being moved between an engagement position where the at least one stopping portion is respectively forced into engagement with the at least one first member of said lift cord roll-up assembly to stop said transmission shaft from rotation, and a release position where the at least one second stopping portion of said lift cord lock is disengaged from the at least one stop member of said lift cord roll-up assembly for enabling said spring release device to rotate said transmission shaft to further roll up the lift cords.
a lift cord roll-up unit, said lift cord roll-up unit having a lift cord roll-up assembly and a spring release device, said lift cord roll-up assembly having a transmission shaft and at least one first stop member fixedly mounted on said transmission shaft, said transmission shaft having two ends respectively fastened to the lift cords of the Venetian blind and adapted for rolling up/letting off the lift cords, said spring release device being coupled to said transmission shaft to impart a spring release force to said transmission shaft and to drive said transmission shaft to roll up the lift cords; and a lift cord lock having a second stop member which is provided with at lease one second stopping portion, said second stop member being moved between an engagement position where the at least one stopping portion is respectively forced into engagement with the at least one first member of said lift cord roll-up assembly to stop said transmission shaft from rotation, and a release position where the at least one second stopping portion of said lift cord lock is disengaged from the at least one stop member of said lift cord roll-up assembly for enabling said spring release device to rotate said transmission shaft to further roll up the lift cords.
2. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, wherein said lift cord roll-up unit and said lift cord lock are mounted in the bottom rail of the Venetian blind.
3. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, wherein said spring release device is a spring member of constant torque.
4. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, said spring release device is a spiral spring.
5. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, wherein the first stop member of said lift cord roll-up unit is a ratchet stop member.
6. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, wherein said lift cord roll-up assembly comprises two lift cord roll-up members fixedly mounted on two ends of said transmission shaft and respectively fastened to the lift cords for synchronous rotation with said transmission shaft to roll up/let off the lift cords.
7. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, wherein said lift cord lock comprises at least one spring member, which supports said second stop member of said lift cord lock in said engagement position.
8. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, wherein said lift cord roll-up assembly further comprises a barrel coupled between said spring release device and said transmission shaft.
9. The concealed type Venetian blind lifting control mechanism as claimed in claim 1, wherein said lift cord roll-up assembly further comprises a limiter adapted to limit movement of said lift cord lock between said engagement position and said release position.
10. The concealed type Venetian blind lifting control mechanism as claimed in claim 9, wherein said limiter comprises two guide rods adapted to guide movement of said lift cord lock between said engagement position and said release position; said lift cord lock comprises two recessed holes respectively coupled to said guide rods of said limiter.
11. The concealed type Venetian blind lifting control mechanism as claimed in claim 10 further comprising two spring members respectively mounted in the recessed holes of said lift cord lock on the guide rods of said limiter and stopped between said limiter and said lift cord lock to force said lift cord lock to said engagement position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002368336A CA2368336A1 (en) | 2002-01-16 | 2002-01-16 | Concealed type venetian blind lifting control mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002368336A CA2368336A1 (en) | 2002-01-16 | 2002-01-16 | Concealed type venetian blind lifting control mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2368336A1 true CA2368336A1 (en) | 2003-07-16 |
Family
ID=27587713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002368336A Abandoned CA2368336A1 (en) | 2002-01-16 | 2002-01-16 | Concealed type venetian blind lifting control mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2368336A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1783316A2 (en) * | 2005-11-08 | 2007-05-09 | Nichibei Co., Ltd. | On-failure blind stopper system |
| CN108386118A (en) * | 2018-04-20 | 2018-08-10 | 瑞安市雅木窗饰有限公司 | A kind of venetian blind |
-
2002
- 2002-01-16 CA CA002368336A patent/CA2368336A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1783316A2 (en) * | 2005-11-08 | 2007-05-09 | Nichibei Co., Ltd. | On-failure blind stopper system |
| EP1783316A3 (en) * | 2005-11-08 | 2012-08-01 | Nichibei Co., Ltd. | On-failure blind stopper system |
| CN108386118A (en) * | 2018-04-20 | 2018-08-10 | 瑞安市雅木窗饰有限公司 | A kind of venetian blind |
| CN108386118B (en) * | 2018-04-20 | 2024-01-19 | 瑞安市雅木窗饰有限公司 | Shutter curtain |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20050117 |