CA2357220A1 - Labor-saving lift cord winding mechanism for blind - Google Patents
Labor-saving lift cord winding mechanism for blind Download PDFInfo
- Publication number
- CA2357220A1 CA2357220A1 CA002357220A CA2357220A CA2357220A1 CA 2357220 A1 CA2357220 A1 CA 2357220A1 CA 002357220 A CA002357220 A CA 002357220A CA 2357220 A CA2357220 A CA 2357220A CA 2357220 A1 CA2357220 A1 CA 2357220A1
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- CA
- Canada
- Prior art keywords
- lift cord
- cord winding
- winding shaft
- labor
- saving
- 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
-
- 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
- E06B2009/3225—Arrangements to aid the winding of cords rollers
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Blinds (AREA)
Abstract
A labor-saving lift cord winding mechanism includes a bearing block fixedly fastened to the top rail of a blind, a lift cord winding shaft pivotally supported on the bearing block, a lift cord inserted through a wire hole of the bearing block and connected between the bottom rail of the blind and the lift cord winding shaft, a driving device adapted to rotate the lift cord winding shaft clockwise/counter-clockwise to further take up/let off the lift cord, and an auxiliary member adapted to impart a biased force to the lift cord winding shaft to force the lift cord winding shaft to take up the lift cord.
Description
LABOR-SAVING LIFT CORD WINDING MECHANISM FOR
BLIND
BACKGROUND OF THE INVENTION
The present invention relates to blinds and, more specifically, to a laborsaving lift cord winding mechanism for blind.
A regular horizontal blind is generally comprised of a top rail, a bottom rail, and a lift cord. A number of slats or a curtain may be arranged between the top rail and the bottom rail. When pulling the lift cord in one direction, the bottom rail is lifted to the top rail to receive the slats/curtain. On the contrary, when pulling the lift cord in the reversed direction, the bottom rail is lowered from the top rail to extend out the slats/curtain. Conventional blinds have different covering areas to fit different working places.
Some blinds have relatively greater vertical height and shorter horizontal width when extended out. Some other blinds have relatively smaller vertical height and shorter horizontal width when extended out. Due to the effect of the gravity weight of the bottom rail and slats (or curtain), less effort is needed to let off the lift cord. However, the user must employ much effort to overcome the gravity weight of the bottom rail and the slats (or curtain) when taking up the lift cord.
Further, the downward pressure of a bind when extending t out is subject to the size of the blind and the material of the slats or curtain. The total weight is relatively increased if the blind has a greater height or horizontal width or the slats are made of relatively heavier material. It requires much effort to lift the lift cord of a heavy blind.
There are known motor-driven horizontal blinds that use a reversible motor to take up/let off the lift cord. Because the output power of the motor must overcome the downward pressure of the gravity weight of the bottom rail and slats (curtain), the motor consumes much energy. In order to overcome the downward pressure of the gravity weight of the bottom rail and slats, an expensive heavy motor must be used, which greatly increases the installation cost and space of the blind.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a labor-saving lift cord winding mechanism for blind, which eliminates the aforesaid drawbacks. It is one object of the present invention to provide a labor-saving lift cord winding mechanism, which provides a biased pressure to facilitate lift cord taking-up action. It is another object of the present invention to provide a labor-saving lift cord winding mechanism, which can be used with a pull cord-operated transmission mechanism so that the user can take up the lift cord with less effort. It is still another object of the present invention to provide a labor-saving lift cord winding mechanism, which can be used with a motor to lessen the output power of the motor required to take up the lift cord.
To achieve these and other objects of the present invention, the labor-saving lift cord winding mechanism comprises a bearing block fixedly fastened to the top rail of a blind, a lift cord winding shaft pivotally supported on the bearing block, a lift cord inserted through a wire hole of the bearing block and connected between the bottom rail of the blind and the lift cord winding shaft, a driving device adapted to rotate the lift cord winding shaft clockwise/counter-clockwise to further take up/let off the lift cord, and an auxiliary member adapted to impart a biased force to the lift cord winding shaft to force the lift cord winding shaft to take up the lift cord.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded view of a labor-saving lift cord winding mechanism according to the present invention.
FIG. 2 is a perspective assembly view of the labor-saving lift cord winding mechanism according to the present invention.
FIG. 3 is a sectional view of the present invention showing the lift cord letting-off action of the labor-saving lift cord winding mechanism.
FIG. 4 is a sectional view of the present invention showing the lift cord taking-up action of the labor-saving lift cord winding mechanism.
FIG. 5 shows one application example of the present invention.
FIG. 6 shows another application example of the present invention.
FIG. 7 is a sectional view showing the two labor-saving lift cord winding mechanism of the embodiment of FIG. 6 connected in series.
FIG. 8 is a sectional view of an alternate form of the labor-saving lift cord winding mechanism according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. from 1 through 3, a labor-saving lift cord winding mechanism 100 in accordance with a first embodiment of the present invention is shown comprised of a bearing block 10, a lift cord winding shaft 20, a driving mechanism 30, a lift cord 40, and an auxiliary member 50.
The bearing block 10 is fastened with a mounting member 14, comprising an elongated bottom wall 11 and two upright sidewalk 12 and 13 at the ends of the elongated bottom wall 11.
One upright sidewall, namely, the first upright sidewall 12 has a semi-circular top notch 121. The mounting member 14 is shaped like a stepped cylinder which is provided with a first end fixedly fastened to the notch 121 of the first upright sidewall 12 of the bearing block 10 by a fastener(screw), a collar located adjacent to the first end and stopped at an inner side of the first upright sidewall 12, a insertion portion 142, and a protrudent pillar 143 having a diameter smaller than that of the insertion portion 142.
The protrudent pillar 143 serves as a first pivot means. The second upright sidewall 13 of the bearing block 10 has a circular through hole 131, which serves as second pivot means. The elongated bottom wall 11 of the bearing block 10 has a wire hole 15 near the first upright sidewall 12.
The lift cord winding shaft 20 is shaped like an elongated barrel comprising a big diameter section 21 and a small diameter section 22. The outside wall of the shaft 20 slops axially in direction from the big diameter section 21 toward the small diameter section 22. The big diameter section 21 is a hollow section coupled to the insertion portion 142 of the mounting member 14, keeping the protrudent pillar 143 of the mounting member 14 received inside the shaft 20. The small diameter section 22 is inserted through the through hole 131 of the second upright sidewall 13 of the bearing block 10, having an axially extended hexagonal coupling hole 221. After installation of the shaft 20 in the bearing block 10, the big diameter section 21 and small s diameter section 22 of the shaft 20 are respectively coupled to the insertion portion 142 and circular through hole 131 of the bearing block 10, i.e., the shaft 20 is coupled to the aforesaid first pivot means and second pivot means and can be rotated on the first and second pivot means.
The driving device 30 comprises a transmission gearing 31, a rotary wheel 32, a pull cord 33, and a transmission axle 34. The transmission gearing 31 is comprised of a casing 35, a worm gear 311, and a worm 312. The worm gear 31 and the worm 312 are mounted in the casing 35 and meshed together. The worm gear 311 has a hexagonal coupling hole 311a extended in axial direction.
The transmission axle 34 is a polygonal axle having two distal ends respectively fitted into the polygonal coupling hole 221 of the shaft and the polygonal coupling hole 311a of the worm gear 311.
15 Rotating the worm gear 311 causes the transmission axle 34 and the shaft 20 to be rotated synchronously. The feature of the transmission gearing 31 enables the worm 312 to drive the worm gear 31 with less effort. On the contrary, much effort should be employed when driving the worm gear 31 to rotate the worm 312.
20 Alternatively, gears of different tooth ratio may be used instead of the transmission gearing 31 to provide the same effect. Further, the rotary wheel 32 has a rectangular center coupling hole 321 and a plurality of peripheral ball notches 322 equiangularly spaced around the periphery. The worm 312 has a rectangular coupling end 312a fitted into the rectangular center coupling hole 321 of the rotary wheel 32. The pull cord 33 is a strings of beads coupled to the ball notches 322 for pulling by hand to rotate the rotary wheel 32 clockwise/counter-clockwise to further drive the transmission gearing 31 to rotate the transmission axle 34 and the shaft 20.
The lift cord 40 has one end fastened to the shaft 20 and the other end fastened to the slats of the blind. When rotating the shaft 20 clockwise, the shaft 20 takes up the lift cord 40 to receive the slats of the blind. On the contrary, when rotating the shaft 20 counter-clockwise, the shaft 20 lets off the lift cord 40 to open the slats of the blind.
The auxiliary member SO is a coil spring sleeved onto the protrudent pillar 143 of the mounting member 14, having one end fixedly fastened to the protrudent pillar 143 of the mounting member 14 by a fastening member, for example, a screw bolt, and the other end inserted into the inside of the shaft 20 and fixedly fastened to the inside wall of the shaft 20 near the small diameter section 22 by a fastening member, for example, a screw bolt.
When rotating the shaft 20 counter-clockwise to let off the lift cord 40, as shown in FIG. 3, one end of the coil spring 50 is immovable, and the other end of the coil spring 50 is turned with the shaft 20, and therefore the coil spring 50 is fastened tight to reserve energy. When reversing energy, the accumulated energy is insufficient to force the worm gear 311 to rotate the worm 312. The maximum amount of energy to be reserved according to the present design is insufficient to force the worm gear 311 to rotate the worm 312.
When rotating the shaft 20 clockwise, i.e., when pulling the pull cord 33 to drive the worm 312 to rotate the worm gear 311, the coil spring 50 releases the accumulated energy, thereby causing the shaft 20 to be rotated in the same direction (clockwise direction) to take up the lift cord 40 (see FIG. 4), enabling the lift cord 40 to be wound round the big diameter section 21 of the shaft 20 in good order.
The labor-saving lift cord winding mechanism 100 can be used with any of different sizes of blinds. FIG. 5 shows an , application example of the present invention where the labor-saving lift cord winding mechanism 100 is used in a blind having a relatively greater height but smaller width when extended out. FIGS. 6 and 7 show another application example of the present invention where the blind has a relatively smaller height but greater width when extended out.
Referring to FIG. S, the labor-saving lift cord winding mechanism 100 is installed in the top rail of the blind, enabling one end of the lift cord 40 to be inserted through a bottom center s through hole (not shown) of the top rail and then fixedly fastened to the bottom rail of the blind. Further, the pull cord 33 is disposed near one lateral side of the blind without obstructing the sense of beauty of the blind. When taking up the lift cord 40, the bottom rail of the blind is lifted in balance.
Referring to FIGS. 6 and 7, two labor-saving lift cord winding mechanisms 100' and 100" are used and provided at two sides. The left-sided labor-saving lift cord winding mechanism 100' is not provided with the aforesaid driving device 30. The mounting member 102 of the right-sided labor-saving lift cord winding mechanism 100" has an axially extended through hole 102a. Further, a cylindrical transmission rod 103 is inserted through the axially extended through hole 102a of the pivot member 102 of the right-sided labor-saving lift cord winding mechanism 100", having a first hexagonal coupling end 103a fitted into the hexagonal coupling hole lOla of the shaft 101 of the left-sided labor-saving lift cord winding mechanism 100' and a second hexagonal coupling end 1036 connected to the shaft 104 and worm gear (not shown) of the right-sided labor-saving lift cord winding mechanism 100". When the user pulls the pull cord 105 of the mechanism 100" it enables for enabling the shaft 101 of the left-sided labor-saving lift cord winding mechanism 100' and the shaft 104 of the right-sided labor-saving lift cord winding mechanism 100" to be rotated synchronously, to further take up or let off the lift cords 106 and 107, enabling the bottom rail of the blind to be moved upwards or downwards in balance.
In the aforesaid two application examples of the present invention, the gravity weight of the bottom rail and slats of the blind forces the blind to extend out smoothly when pulling the pull cord in one direction to let off the lift cord, therefore less effort is needed to rotate the rotary wheel to let off the lift cord. On the contrary, when pulling the pull cord to rotate the rotary wheel to further take up the lift cord, the auxiliary member (coil spring) of the labor-saving lift cord winding mechanism releases the reserved energy to rotate the respective shaft in taking up the respective lift cord. Therefore, less effort is needed to take up the lift cord.
FIG. 8 shows an alternate form of the labor-saving lift cord winding mechanism according to the present invention. According to this alternate form, the labor-saving lift cord winding mechanism 200 is comprised of a bearing block 201, a lift cord winding shaft 202, a lift cord 203, an auxiliary member 204, and a driving device 205. According to this embodiment, the driving device 205 is comprised of a motor 206 and a switch 207. The motor 206 comprises an output shaft 206a connected to one end of the shaft 202. The motor 206 is connected to power source through the switch 207. The switch 207 is disposed accessible to the user, ~o comprising an up stroke control button 207a adapted to control clockwise rotation of the motor 206 to take up the lift cord 203, and a down stroke control button 207b adapted to control counter-clockwise rotation of the motor 206 to let off the lift cord 203. The auxiliary member 204 is adapted to impart a biased force to the shaft 202, so as to lessen the load of the motor 206 and to prolong the service life of the motor 206.
A prototype of labor-saving lift cord winding mechanism has been constructed with the features of FIGS. 1~8. The labor-saving lift cord winding mechanism functions smoothly to provide all of the features discussed earlier.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
m
BLIND
BACKGROUND OF THE INVENTION
The present invention relates to blinds and, more specifically, to a laborsaving lift cord winding mechanism for blind.
A regular horizontal blind is generally comprised of a top rail, a bottom rail, and a lift cord. A number of slats or a curtain may be arranged between the top rail and the bottom rail. When pulling the lift cord in one direction, the bottom rail is lifted to the top rail to receive the slats/curtain. On the contrary, when pulling the lift cord in the reversed direction, the bottom rail is lowered from the top rail to extend out the slats/curtain. Conventional blinds have different covering areas to fit different working places.
Some blinds have relatively greater vertical height and shorter horizontal width when extended out. Some other blinds have relatively smaller vertical height and shorter horizontal width when extended out. Due to the effect of the gravity weight of the bottom rail and slats (or curtain), less effort is needed to let off the lift cord. However, the user must employ much effort to overcome the gravity weight of the bottom rail and the slats (or curtain) when taking up the lift cord.
Further, the downward pressure of a bind when extending t out is subject to the size of the blind and the material of the slats or curtain. The total weight is relatively increased if the blind has a greater height or horizontal width or the slats are made of relatively heavier material. It requires much effort to lift the lift cord of a heavy blind.
There are known motor-driven horizontal blinds that use a reversible motor to take up/let off the lift cord. Because the output power of the motor must overcome the downward pressure of the gravity weight of the bottom rail and slats (curtain), the motor consumes much energy. In order to overcome the downward pressure of the gravity weight of the bottom rail and slats, an expensive heavy motor must be used, which greatly increases the installation cost and space of the blind.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a labor-saving lift cord winding mechanism for blind, which eliminates the aforesaid drawbacks. It is one object of the present invention to provide a labor-saving lift cord winding mechanism, which provides a biased pressure to facilitate lift cord taking-up action. It is another object of the present invention to provide a labor-saving lift cord winding mechanism, which can be used with a pull cord-operated transmission mechanism so that the user can take up the lift cord with less effort. It is still another object of the present invention to provide a labor-saving lift cord winding mechanism, which can be used with a motor to lessen the output power of the motor required to take up the lift cord.
To achieve these and other objects of the present invention, the labor-saving lift cord winding mechanism comprises a bearing block fixedly fastened to the top rail of a blind, a lift cord winding shaft pivotally supported on the bearing block, a lift cord inserted through a wire hole of the bearing block and connected between the bottom rail of the blind and the lift cord winding shaft, a driving device adapted to rotate the lift cord winding shaft clockwise/counter-clockwise to further take up/let off the lift cord, and an auxiliary member adapted to impart a biased force to the lift cord winding shaft to force the lift cord winding shaft to take up the lift cord.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded view of a labor-saving lift cord winding mechanism according to the present invention.
FIG. 2 is a perspective assembly view of the labor-saving lift cord winding mechanism according to the present invention.
FIG. 3 is a sectional view of the present invention showing the lift cord letting-off action of the labor-saving lift cord winding mechanism.
FIG. 4 is a sectional view of the present invention showing the lift cord taking-up action of the labor-saving lift cord winding mechanism.
FIG. 5 shows one application example of the present invention.
FIG. 6 shows another application example of the present invention.
FIG. 7 is a sectional view showing the two labor-saving lift cord winding mechanism of the embodiment of FIG. 6 connected in series.
FIG. 8 is a sectional view of an alternate form of the labor-saving lift cord winding mechanism according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. from 1 through 3, a labor-saving lift cord winding mechanism 100 in accordance with a first embodiment of the present invention is shown comprised of a bearing block 10, a lift cord winding shaft 20, a driving mechanism 30, a lift cord 40, and an auxiliary member 50.
The bearing block 10 is fastened with a mounting member 14, comprising an elongated bottom wall 11 and two upright sidewalk 12 and 13 at the ends of the elongated bottom wall 11.
One upright sidewall, namely, the first upright sidewall 12 has a semi-circular top notch 121. The mounting member 14 is shaped like a stepped cylinder which is provided with a first end fixedly fastened to the notch 121 of the first upright sidewall 12 of the bearing block 10 by a fastener(screw), a collar located adjacent to the first end and stopped at an inner side of the first upright sidewall 12, a insertion portion 142, and a protrudent pillar 143 having a diameter smaller than that of the insertion portion 142.
The protrudent pillar 143 serves as a first pivot means. The second upright sidewall 13 of the bearing block 10 has a circular through hole 131, which serves as second pivot means. The elongated bottom wall 11 of the bearing block 10 has a wire hole 15 near the first upright sidewall 12.
The lift cord winding shaft 20 is shaped like an elongated barrel comprising a big diameter section 21 and a small diameter section 22. The outside wall of the shaft 20 slops axially in direction from the big diameter section 21 toward the small diameter section 22. The big diameter section 21 is a hollow section coupled to the insertion portion 142 of the mounting member 14, keeping the protrudent pillar 143 of the mounting member 14 received inside the shaft 20. The small diameter section 22 is inserted through the through hole 131 of the second upright sidewall 13 of the bearing block 10, having an axially extended hexagonal coupling hole 221. After installation of the shaft 20 in the bearing block 10, the big diameter section 21 and small s diameter section 22 of the shaft 20 are respectively coupled to the insertion portion 142 and circular through hole 131 of the bearing block 10, i.e., the shaft 20 is coupled to the aforesaid first pivot means and second pivot means and can be rotated on the first and second pivot means.
The driving device 30 comprises a transmission gearing 31, a rotary wheel 32, a pull cord 33, and a transmission axle 34. The transmission gearing 31 is comprised of a casing 35, a worm gear 311, and a worm 312. The worm gear 31 and the worm 312 are mounted in the casing 35 and meshed together. The worm gear 311 has a hexagonal coupling hole 311a extended in axial direction.
The transmission axle 34 is a polygonal axle having two distal ends respectively fitted into the polygonal coupling hole 221 of the shaft and the polygonal coupling hole 311a of the worm gear 311.
15 Rotating the worm gear 311 causes the transmission axle 34 and the shaft 20 to be rotated synchronously. The feature of the transmission gearing 31 enables the worm 312 to drive the worm gear 31 with less effort. On the contrary, much effort should be employed when driving the worm gear 31 to rotate the worm 312.
20 Alternatively, gears of different tooth ratio may be used instead of the transmission gearing 31 to provide the same effect. Further, the rotary wheel 32 has a rectangular center coupling hole 321 and a plurality of peripheral ball notches 322 equiangularly spaced around the periphery. The worm 312 has a rectangular coupling end 312a fitted into the rectangular center coupling hole 321 of the rotary wheel 32. The pull cord 33 is a strings of beads coupled to the ball notches 322 for pulling by hand to rotate the rotary wheel 32 clockwise/counter-clockwise to further drive the transmission gearing 31 to rotate the transmission axle 34 and the shaft 20.
The lift cord 40 has one end fastened to the shaft 20 and the other end fastened to the slats of the blind. When rotating the shaft 20 clockwise, the shaft 20 takes up the lift cord 40 to receive the slats of the blind. On the contrary, when rotating the shaft 20 counter-clockwise, the shaft 20 lets off the lift cord 40 to open the slats of the blind.
The auxiliary member SO is a coil spring sleeved onto the protrudent pillar 143 of the mounting member 14, having one end fixedly fastened to the protrudent pillar 143 of the mounting member 14 by a fastening member, for example, a screw bolt, and the other end inserted into the inside of the shaft 20 and fixedly fastened to the inside wall of the shaft 20 near the small diameter section 22 by a fastening member, for example, a screw bolt.
When rotating the shaft 20 counter-clockwise to let off the lift cord 40, as shown in FIG. 3, one end of the coil spring 50 is immovable, and the other end of the coil spring 50 is turned with the shaft 20, and therefore the coil spring 50 is fastened tight to reserve energy. When reversing energy, the accumulated energy is insufficient to force the worm gear 311 to rotate the worm 312. The maximum amount of energy to be reserved according to the present design is insufficient to force the worm gear 311 to rotate the worm 312.
When rotating the shaft 20 clockwise, i.e., when pulling the pull cord 33 to drive the worm 312 to rotate the worm gear 311, the coil spring 50 releases the accumulated energy, thereby causing the shaft 20 to be rotated in the same direction (clockwise direction) to take up the lift cord 40 (see FIG. 4), enabling the lift cord 40 to be wound round the big diameter section 21 of the shaft 20 in good order.
The labor-saving lift cord winding mechanism 100 can be used with any of different sizes of blinds. FIG. 5 shows an , application example of the present invention where the labor-saving lift cord winding mechanism 100 is used in a blind having a relatively greater height but smaller width when extended out. FIGS. 6 and 7 show another application example of the present invention where the blind has a relatively smaller height but greater width when extended out.
Referring to FIG. S, the labor-saving lift cord winding mechanism 100 is installed in the top rail of the blind, enabling one end of the lift cord 40 to be inserted through a bottom center s through hole (not shown) of the top rail and then fixedly fastened to the bottom rail of the blind. Further, the pull cord 33 is disposed near one lateral side of the blind without obstructing the sense of beauty of the blind. When taking up the lift cord 40, the bottom rail of the blind is lifted in balance.
Referring to FIGS. 6 and 7, two labor-saving lift cord winding mechanisms 100' and 100" are used and provided at two sides. The left-sided labor-saving lift cord winding mechanism 100' is not provided with the aforesaid driving device 30. The mounting member 102 of the right-sided labor-saving lift cord winding mechanism 100" has an axially extended through hole 102a. Further, a cylindrical transmission rod 103 is inserted through the axially extended through hole 102a of the pivot member 102 of the right-sided labor-saving lift cord winding mechanism 100", having a first hexagonal coupling end 103a fitted into the hexagonal coupling hole lOla of the shaft 101 of the left-sided labor-saving lift cord winding mechanism 100' and a second hexagonal coupling end 1036 connected to the shaft 104 and worm gear (not shown) of the right-sided labor-saving lift cord winding mechanism 100". When the user pulls the pull cord 105 of the mechanism 100" it enables for enabling the shaft 101 of the left-sided labor-saving lift cord winding mechanism 100' and the shaft 104 of the right-sided labor-saving lift cord winding mechanism 100" to be rotated synchronously, to further take up or let off the lift cords 106 and 107, enabling the bottom rail of the blind to be moved upwards or downwards in balance.
In the aforesaid two application examples of the present invention, the gravity weight of the bottom rail and slats of the blind forces the blind to extend out smoothly when pulling the pull cord in one direction to let off the lift cord, therefore less effort is needed to rotate the rotary wheel to let off the lift cord. On the contrary, when pulling the pull cord to rotate the rotary wheel to further take up the lift cord, the auxiliary member (coil spring) of the labor-saving lift cord winding mechanism releases the reserved energy to rotate the respective shaft in taking up the respective lift cord. Therefore, less effort is needed to take up the lift cord.
FIG. 8 shows an alternate form of the labor-saving lift cord winding mechanism according to the present invention. According to this alternate form, the labor-saving lift cord winding mechanism 200 is comprised of a bearing block 201, a lift cord winding shaft 202, a lift cord 203, an auxiliary member 204, and a driving device 205. According to this embodiment, the driving device 205 is comprised of a motor 206 and a switch 207. The motor 206 comprises an output shaft 206a connected to one end of the shaft 202. The motor 206 is connected to power source through the switch 207. The switch 207 is disposed accessible to the user, ~o comprising an up stroke control button 207a adapted to control clockwise rotation of the motor 206 to take up the lift cord 203, and a down stroke control button 207b adapted to control counter-clockwise rotation of the motor 206 to let off the lift cord 203. The auxiliary member 204 is adapted to impart a biased force to the shaft 202, so as to lessen the load of the motor 206 and to prolong the service life of the motor 206.
A prototype of labor-saving lift cord winding mechanism has been constructed with the features of FIGS. 1~8. The labor-saving lift cord winding mechanism functions smoothly to provide all of the features discussed earlier.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
m
Claims (11)
1. A labor-saving lift cord winding mechanism installed in the top rail of a blind, comprising:
a bearing block, said bearing block having first pivot means at one end thereof, second pivot means at an opposite end thereof, and a wire hole through a bottom sidewall thereof;
a lift cord winding shaft shaped like an elongated barrel, said lift cord winding shaft having two distal ends respectively pivoted to said first pivot means and said second pivot means for free rotation on said first and second pivot means of said bearing block;
a driving device adapted to rotate said lift cord winding shaft clockwise/counter-clockwise;
a lift cord having a first end fixedly fastened to a bottom vail of the blind and a second end inserted through said wire hole of said bearing block and fixedly fastened to said lift cord winding shaft such that said lift cord is driven by said lift cord winding shaft at the time when the lift cord winding shaft rotated;
an auxiliary member adapted to impart a biased force to said lift cord winding shaft to force said lift cord winding shaft to take up said lift cord.
a bearing block, said bearing block having first pivot means at one end thereof, second pivot means at an opposite end thereof, and a wire hole through a bottom sidewall thereof;
a lift cord winding shaft shaped like an elongated barrel, said lift cord winding shaft having two distal ends respectively pivoted to said first pivot means and said second pivot means for free rotation on said first and second pivot means of said bearing block;
a driving device adapted to rotate said lift cord winding shaft clockwise/counter-clockwise;
a lift cord having a first end fixedly fastened to a bottom vail of the blind and a second end inserted through said wire hole of said bearing block and fixedly fastened to said lift cord winding shaft such that said lift cord is driven by said lift cord winding shaft at the time when the lift cord winding shaft rotated;
an auxiliary member adapted to impart a biased force to said lift cord winding shaft to force said lift cord winding shaft to take up said lift cord.
2. The labor-saving lift cord winding mechanism as claimed in claim 1 wherein said first pivot means and said second pivot means of said bearing block are a protrudent pillar and a through hole respectively, and said lift cord winding shaft has one end terminating in an open end and coupled to said protrudent pillar and an opposite end inserted into the through hole.
3. The labor-saving lift cord winding mechanism as claimed in claim 2 wherein said auxiliary member is a coil spring sleeved onto said protrudent pillar, having one end fixedly fastened to said protrudent pillar and an opposite end fixedly fastened to an inside wall of said lift cord winding shaft.
4. The labor-saving lift cord winding mechanism as claimed in claim 2 wherein said bearing block has a top notch disposed at one end, and a mounting member is fastened at one end thereof in said top notch, said mounting member provided at other end thereof with said protrudent pillar.
5. The labor-saving lift cord winding mechanism as claimed in claim 1 wherein said wire hole of said bearing block is disposed adjacent to said first pivot means, and the second end of said lift cord is fixedly fastened to said lift cord winding shaft adjacent to said second pivot means.
6. The labor-saving lift cord winding mechanism as claimed in claim 1 wherein said lift cord winding shaft has a big diameter portion coupled to said first pivot means of said bearing block and a small diameter portion coupled to said second pivot means of said bearing block.
7. The labor-saving lift cord winding mechanism as claimed in claim 1 wherein said driving device comprises a rotary wheel coupled to one end of said lift cord winding shaft, and a pull cord coupled to said rotary wheel for pulling by hand to drive said rotary wheel to rotate said lift cord winding shaft.
8. The labor-saving lift cord winding mechanism as claimed in claim 7 wherein said driving mechanism further comprising a transmission gearing coupled between said rotary wheel and said lift cord winding shaft and adapted to rotate said lift cord winding shaft to take up said lift cord upon rotary motion of said rotary wheel.
9. The labor-saving lift cord winding mechanism as claimed in claim 8 wherein said transmission gearing comprises a worm gear coaxially fixedly connected to said lift cord winding shaft, and a worm meshed with said worm gear and fixedly connected to said rotary wheel.
10. The labor-saving lift cord winding mechanism as claimed in claim 9 wherein said lift cord winding shaft has a non-circular coupling hole disposed in one end thereof, said worm gear has a non-circular center coupling hole, and said driving device further comprises a transmission shaft coupled between the coupling hole of said lift cord winding shaft and the coupling hole of said worm gear for enabling said lift cord winding shaft to be rotated with said worm gear.
11. The labor-saving lift cord winding mechanism as claimed in claim 1 wherein said driving device comprises a motor adapted to rotate said lift cord winding shaft clockwise/counter-clockwise, and a switch adapted to control clockwise/counter-clockwise rotation of said motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002357220A CA2357220A1 (en) | 2001-09-10 | 2001-09-10 | Labor-saving lift cord winding mechanism for blind |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002357220A CA2357220A1 (en) | 2001-09-10 | 2001-09-10 | Labor-saving lift cord winding mechanism for blind |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2357220A1 true CA2357220A1 (en) | 2003-03-10 |
Family
ID=4169965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002357220A Abandoned CA2357220A1 (en) | 2001-09-10 | 2001-09-10 | Labor-saving lift cord winding mechanism for blind |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2357220A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1647666A2 (en) * | 2003-12-10 | 2006-04-19 | CTR Trading B.V. | Device for selectively lowering and raising a pleated blind or a roller blind |
| NL1027415C2 (en) * | 2003-12-10 | 2006-05-31 | C T R Trading B V | Device for selectively lowering and raising pleated or roller blind comprises winding rollers for winding up and unwinding respective cords, guiding eyes and fixation unit for fastening the end of each cord to the winding roller |
| WO2008075954A1 (en) * | 2006-12-20 | 2008-06-26 | Coulisse B.V. | Device for automatically raising or lowering a window covering |
| CN103711413A (en) * | 2006-12-20 | 2014-04-09 | 亨特道格拉斯有限公司 | System for operating top down/bottom up covering for architectural opening |
| CN108316844A (en) * | 2018-04-11 | 2018-07-24 | 佛山科学技术学院 | A kind of sunshading board with lighting change direction |
-
2001
- 2001-09-10 CA CA002357220A patent/CA2357220A1/en not_active Abandoned
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1647666A2 (en) * | 2003-12-10 | 2006-04-19 | CTR Trading B.V. | Device for selectively lowering and raising a pleated blind or a roller blind |
| EP1647666A3 (en) * | 2003-12-10 | 2006-04-26 | CTR Trading B.V. | Device for selectively lowering and raising a pleated blind or a roller blind |
| NL1027415C2 (en) * | 2003-12-10 | 2006-05-31 | C T R Trading B V | Device for selectively lowering and raising pleated or roller blind comprises winding rollers for winding up and unwinding respective cords, guiding eyes and fixation unit for fastening the end of each cord to the winding roller |
| WO2008075954A1 (en) * | 2006-12-20 | 2008-06-26 | Coulisse B.V. | Device for automatically raising or lowering a window covering |
| CN103711413A (en) * | 2006-12-20 | 2014-04-09 | 亨特道格拉斯有限公司 | System for operating top down/bottom up covering for architectural opening |
| CN103711413B (en) * | 2006-12-20 | 2016-01-13 | 亨特道格拉斯有限公司 | For operating the system of the covering device of architectural openings |
| CN108316844A (en) * | 2018-04-11 | 2018-07-24 | 佛山科学技术学院 | A kind of sunshading board with lighting change direction |
| CN108316844B (en) * | 2018-04-11 | 2023-07-18 | 佛山科学技术学院 | Sun shield capable of changing direction along with illumination |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20040910 |