The present invention relates to window blind technology and more particularly, to a blind body actuator for cordless window blind.
Commercial window blinds can be classified into corded window blinds and cordless window blinds. The corded window blind uses a pull cord for pulling by a.
user to adjust the slats between an extended state and a received state, while the non-cord window blind uses manual power to upward push or downward pull the bottom rail, so that the blind body can be extended out or received.
It is known that Taiwan patent number: 263877 and patent number: 322458 describe improved actuator designs for lifting blind body of a window blind. However, the abovementioned designs are still complex in structure. Further, if the abovementioned designs are applied to large scale window blind, subject to the weight of its blind body, the blind body may not effectively and smoothly actuated.
The present invention has been accomplished under the circumstances in view. It is an objective of the present to provide a blind body actuator for non-cord window blind, whose blind body can be effectively and smoothly actuated.
To achieve this and other objectives of the present invention, a blind body actuator for non-cord window blind is provide to comprise a casing, a winding mechanism, a set of lift-cord wheels, a set of guide units and a set of lift cords. The winding mechanism is rotatably mounted in the casing and comprises a first bottom winding wheel, a first upper winding wheel disposed on the first bottom winding wheel, a second bottom winding wheel meshed with the first bottom winding wheel, and a second upper winding wheel disposed on the second bottom winding wheel and meshed with the first upper winding wheel. The winding mechanism further comprising an upper volute spring and a bottom volute spring. The upper volute spring has two ends thereof connected with the first and second upper winding wheel respectively and it is capable of wound around the first upper winding wheel or the second upper winding wheel. The bottom volute spring has two ends thereof connected to the first and second bottom winding wheel respectively and it is capable of being wound around the first bottom winding wheel or the second bottom winding wheel.
The set of lift-cord wheels are rotatably mounted in the casing and they comprise a first lift-cord wheel and a second lift-cord wheel. The first lift-cord and the second lift-cord are respectively meshed with the first bottom winding wheel and the second bottom winding wheel.
The set of guide units are rotatably mounted in the casing and they comprise a first guide unit and a second guide unit. The first guide unit and the second guide unit are respectively disposed adjacent to the first lift-cord wheel and the second lift-cord wheel. The first and second guide units both comprise a first cylinder roller. Each of the first cylinder rollers, the first and second winding wheels, and the first and second lift-cord wheels has an axle respectively, and the axles of the first cylinder rollers, the first and second winding wheels, and the first amid second lift-cord wheels are parallel to each other; and
the set of lift cords comprise two first lift cords and two second lift cords. The two first lift cords and the two second lift cords are respectively wound around the first cylinder roller of the first guide unit and the first cylinder roller of the second guide unit respectively. Each of the two first lift cords has one end thereof connected to the first lift-cord wheel so that each of the first lift cords are capable of being wound around or unwound around the first lift-cord wheel by the rotation of the first lift-cord wheel. Each of said two second lift cords has one end thereof connected to the second lift-cord wheel so that each of the first lift cords are capable of being wound around or unwound around the second lift-cord wheel by the rotation of the second lift-cord wheel. Each of the first lift cords and the second lift cords has an opposite end thereof extended out of the casing.
The beneficiary effect of the present invention is as follows: the overall structural design of the blind body actuator is still simple. Further, when the blind body actuator is applied to large scale window blind, the blind body actuator can still effectively and smoothly actuate the blind body via the first and the second guide units.
In one aspect, the casing has a front side and a rear side. The two first cylinder rollers are disposed adjacent to the front side of said casing. Each of the first lift cords are wound around the first cylinder roller of the first guide unit through one turn and each of the second lift cords are wound around the first cylinder roller of the second guide unit through one turn.
In another aspect, both of the first and second guide units further comprise a second cylinder roller rotatably mounted in the casing. The casing has a front side and a rear side. The two first cylinder rollers and the two second cylinder rollers of the first and second guide units are respectively disposed adjacent to the front side and the rear side of the casing respectively. The two first lift cords are wound around the first cylinder roller of the first guide unit through half turn and then wound around the second cylinder roller of the first guide unit through half turn. The two second lift cords are wound around the first cylinder roller of the second guide unit through half turn and then wound around the second cylinder roller of the second guide unit through half turn.
In another aspect, the first guide unit and the second guide unit both further comprise a second cylinder roller and a third cylinder roller. The casing comprises a front side and a rear side. The two second cylinder rollers and the two third cylinder rollers are rotatably mounted in the casing. The two first cylinder rollers are mounted adjacent to the front side. The two second cylinder rollers and the two third cylinder rollers are juxtaposed and mounted adjacent to the rear side. The two first lift cords are wound around the first cylinder roller of the first guide unit through half turn, wound around the second cylinder roller of the first guide unit through half turn, and then wound around the third cylinder roller of the first guide unit through one turn. The two second lift cords are wound around the first cylinder roller of the second guide unit through half turn, wound around the second cylinder roller of the second guide unit through half turn, and then wound around the third cylinder roller of the second guide unit through one turn.
In another aspect, the casing comprises a left side and a right side, both of which has an opening and a cross bar disposed in the corresponding opening in such a manner that a center of the cross bar coincides with a center of the corresponding the opening. The two first lift cords are extended out of the casing through the opening and peripherally abutted against the center of the corresponding cross bar at the left side. The two second lift cords are extended out of the casing through the opening and peripherally abutted against the center of the corresponding cross bar at the right side.
Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference signs denote like components of structure.
Referring to
The casing 20 is mounted in the headrail 12, comprising a top panel 22 and an opposing bottom panel 21 fastened to the top panel 22. The top panel 22 has two opposing through holes 26 for mounting a steering rod 18 of the window blind 1. Further, the casing 20 has two openings 23 defined between the bottom panel 21 and the top panel 22 in each of two lateral sides respectively (i.e. left side and right side of the casing 20), and two cross bar 24 each located in each of the opening 23 and fixedly connected between the bottom panel 21 and the top panel 22 in such a manner that a center of the cross bar 24 coincides with a center of a corresponding one of the opening 23.
The winding mechanism 30 comprises a first upper winding wheel 32a, a second upper winding wheel 32b, a first lower winding wheel 32c, a second lower winding wheel 32d, an upper volute spring 34a, and a lower volute spring 32b. The first upper winding wheel 32a and the second upper winding wheel 32b are juxtaposed (along a direction from the left side to the right side of the casing 20) on the top panel 22 and meshed with each other. The first lower winding wheel 32c and the second lower winding wheel 32d are juxtaposed on the top panel 22 and respectively and coaxially disposed below the first upper winding wheel 32a and the second upper winding wheel 32b. The first lower winding wheel 32c and the second lower winding wheel 32d are meshed with each other. Further, the first upper winding wheel 32a along with the first lower winding wheel 32c are connected with a first wheel axle 28 (so are the second upper winding wheel 32b and the second lower winding wheel 32d) in such a manner that the winding wheels 32a, 32b,32c,32d can rotate synchronously. The upper volute spring 34a has two opposite ends thereof respectively connected to the first upper winding wheel 32a and the second upper winding wheel 32b. Subject to relative rotation between the first upper winding wheel 32a and the second upper winding wheel 32b, the upper volute spring 34a can be fully wound around the first upper winding wheel 32a or the second upper winding wheel 32b. Similarly, the lower volute spring 34b has two opposite ends thereof respectively connected to the first lower winding wheel 32c and the second lower winding wheel 32d. Subject to relative rotation between the first lower winding wheel 32c and the second lower winding wheel 32d, the lower volute spring 34b can be fully wound around the first lower winding wheel 32c or the second lower winding wheel 32d.
The set of the lift-cord wheels 40 comprises a first lift-cord wheel 40a and a second lift-cord wheel 40b, both of which are rotatably mounted between the top panel 22 and the bottom panel 21 of the casing 20 by two corresponding second wheel axles 29. The first lift-cord wheel 40a is meshed with the first lower winding wheel 32c, and the second lift-cord wheel 40b is meshed with the second lower winding wheel 32b so that the first lift-cord wheel 40a is rotatable with the meshed first lower winding wheel 32c synchronously and the second lift-cord wheel 40b is rotatable with the meshed second lower winding wheel 32d synchronously. Further, both of the first lift-cord wheel 40a and the second lift-cord wheel 40b have a partition 41 disposed at a middle thereof. The partition 41 separates two accommodating spaces for winding the corresponding lift cords 60.
With reference to
The set of lift cords 60 has two first lift cords 60a,60b and two second lift cords 60c,60d. The two first lift cords 60a,60b each have one end thereof fixedly connected to the first lift-cord wheel 40a and respectively disposed at two sides of the partition 41 of the first lift-cord wheel 40a so that the two first lift cords 60a,60b can be wound or unwound around the first lift-cord wheels 40a by the rotation of the first lift-cord wheels 40a. Hence, the two first lift cords 60a,60b will not intertwine to each other. The two second lift cords 60c,60d each have one end thereof fixedly connected to the second lift-cord wheel 40b and respectively disposed at two sides of the partition 41 of the second lift-cord wheel 40b so that the two second lift cords 60c,60d can be wound or unwound around the second lift-cord wheels 40b by the rotation of the second lift-cord wheels 40b. Hence, the two second lift cords 60c,60d will not intertwine to each other. Further, according to various sizes of different window blinds 1, the user may employ corresponding winding methods to wind the two first lift cords 60a,60b around the cylinder rollers 51,52,53 of the first guide unit 50a. (Similarly, the user may employ corresponding methods to wind the two second lift cords 60c,60d around the cylinder rollers 51,52,53 of the second guide unit 50b.) For example, if a small size window blind 1 is applied as shown in
Based on the abovementioned structure of the blind body actuator 10, when the user wants to extend out the blind body 16 (shown in
When the user wants to receive the blind body 16 (as shown in
Either in the process of extending out the blind body 16 or receiving the blind body 16, the cylinder rollers 51,52,53 of the guide units 50a,50b can be driven to rotate by the corresponding lift cords 60 by means of the friction force generated therebetween, enhancing the stability and smoothness of the actuation of the lift cords 60, and thus, the overall operation process can achieve optimal actuation effects.