Beaded-chain control device for window blinds
A beaded-chain control device for window blinds comprises a positioning seat with an assembling cavity defining one side therein for the accommodation of a cord-winding unit equipped with a two-way rotary cylinder thereon wherein the two-way rotary cylinder is driven by a beaded-chain to rotate in clockwise or counterclockwise direction thereby, and the assembling cavity thereof has a passage cut at both lateral sides thereon respectively. The cord-winding unit also has a smaller-diameter winding-shaft protruding at the other end of the two-way rotary cylinder to precisely align with the passages thereof so that an actuating cord can pass through the passage to attach onto the winding-shaft and synchronically actuate each pull cord linked thereto to collect or expand a blind body thereby, permitting smoother operation and reducing the assembly parts to cut the cost of production and achieve economical efficiency thereby.
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The present invention relates to a beaded-chain control device for window blinds, comprising a positioning seat and a cord-winding unit wherein the position seat has an assembling cavity with a set of passages symmetrically defining both lateral sides thereon and precisely aligned with a winding-shaft protruding at one end of a two-way rotary cylinder of the cord-winding unit so that an actuating cord can pass through the passages to attach onto the winding shaft and synchronically actuate each pull cord of the window blind linked thereto, permitting smoother operation and reducing the assembly parts to achieve economical efficiency thereby.
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There are some drawbacks to such conventional beaded-chain window blind. First, depending on the number and position of the pull cords 14, the beaded-chain operated seat 12 must have multiple cord winders 13 mounted onto the linking rod 11 to match to the pull cords 14 each attached to one cord winder 13 respectively. Thus, the conventional beaded-chain window blind is not only complicated in its assembling parts, but also inconveniently time-consuming in the assembly thereof, which may boost the cost of production in an uneconomical way. Second, each pull cord 14 is individually wound onto one cord-winder 13. In case one of the pull cords 14 wound onto the cord winders 13 gets entangled in operation, the beaded-chain operated seat 12 will become jammed in an immovable situation and must be repeatedly pulled to return to the normal state, which can cause inconvenience in application thereof.
SUMMARY OF THE PRESENT INVENTIONIt is, therefore, the primary purpose of the present invention to provide a beaded-chain control device for window blinds, comprising a positioning seat and a cord-winding unit wherein the position seat has an assembling cavity with a set of passages symmetrically defining both lateral sides thereon and precisely aligned with a winding-shaft protruding at one end of a two-way rotary cylinder of the cord-winding unit so that an actuating cord can pass through the passages to attach onto the winding-shaft and synchronically actuate each pull cord of the window blind linked thereto, permitting smoother operation without getting entangled or jammed as found in the above-mentioned conventional multiple cord-winders as well as reducing the assembly parts to facilitate easier and speedier assembly and cut the cost of production in an economical way.
BRIEF DESCRIPTION OF THE DRAWINGS
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In application, the beaded-chain 34 of the cord-winding unit 30 is effortlessly drawn to actuate the two-way rotary cylinder 33 rotating inside the assembling cavity 21 and actuating the synchronic movement of the winding-shaft 333 at the same time as shown in
Claims
1. A beaded-chain control device for window blinds, comprising a positioning seat with an assembling cavity defining the interior of one side for the accommodation of a cord-winding unit equipped with a two-way rotary cylinder thereon wherein the two-way rotary cylinder is driven by a beaded-chain to rotate in clockwise or counterclockwise direction thereby; the present invention being characterized by that,
- the assembling cavity of the positioning seat having a passage cut at both lateral sides thereon respectively, and the cord-winding unit having a smaller-diameter winding-shaft protruding at the other end of the two-way rotary cylinder to precisely align with the passages thereof so that an actuating cord can be guided through the passages to attach onto the winding-shaft and synchronically actuated to coil up or release according to the revolving direction of the winding-shaft thereby.
2. The beaded-chain control device for window blinds as claimed in claim 1 wherein the actuating cord can have more than two pull cords synchronically attached thereto at one end thereof.
3. The beaded-chain control device for window blinds as claimed in claim 1 wherein both sides of the winding-shaft are defined by a set of stop rings that, each shaped larger than the outer diameter of the two-way rotary cylinder, are precisely situated at both sides of the passages thereof.
4. The beaded-chain control device for window blinds as claimed in claim 3 wherein the winding-shaft has a pivoting axle extending outwards from the stop ring situated at the outer side thereof.
5. The beaded-chain control device for window blinds as claimed in claim 1 wherein the passage of the positioning seat can be made in a rectangular-shaped configuration.
Type: Application
Filed: Feb 1, 2006
Publication Date: Jun 7, 2007
Applicant:
Inventor: Wen Liang (Changhua Hsien)
Application Number: 11/344,232
International Classification: A47H 5/00 (20060101);