Device for winding suspension cord of blind

Abstract

A device for winding a suspension cord of a blind is provided to wind a suspension cord disposed on a blind. The suspension cord is spirally wound about a cord spool through a spiral guide groove of a guide component, and then arranged along the cord spool in sequence. Additionally, when the cord spool is connected to a power resilient element as a power source of rotation, friction force is applied to the cord spool through an adjusting component to adjust the output torque of the cord spool, such that the torque applied to the cord spool by the power resilient element can be balanced out with the torque applied to the cord spool by the gravity of the blind.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]The present invention relates to a device for winding a suspension cord of a blind, and more particularly to a device for winding a suspension cord of a blind, which arranges the suspension cord on a cord spool in sequence through a guide means and adjusts the output torque of the cord spool by using the friction force applied to the cord spool by an adjusting means.[0003]2. Related Art[0004]A cordless blind utilizes a spring housing as a power source, and the torque applied to a cord spool by the spring housing is balanced out with the torque applied to the cord spool by the gravity of the blind. Therefore, the blind can be kept at any position.[0005]The relevant technology has been disclosed in some U.S. patents. U.S. Patent Publication No. 5,706,876 has disclosed that a suspension cord is wound when a roller shade bar is rotated, and a power spring is disposed in the roller shade bar to generate the power of rotation for...

AI Technical Summary

Benefits of technology

[0009]In view of the aforementioned problems needed to be solved, the device for winding a suspension cord of a blind provided by the present invention may arrange the suspension cord on a cord spool in sequence and can compensate the torque of a power resilient element for the blinds of different sizes.

[0010]Accordingly, the present invention provides a device for winding a suspension cord of a blind which is used to wind a suspension cord passing through at least one covering material of a blind. The device for winding a suspension cord of a blind comprises a power resilient element, a pedestal, a cord spool, a guide means and an adjusting means. The cord spool is pivoted to the pedestal and driven by the power resilient element to rotate, such that the suspension cord is guided by the guide means to be wound about the cord spool smoothly and sequentially. Additionally, the adjusting means is mounted on the pedestal to apply a friction force to the cord spool to damp the rotation of the cord spool, thereby balancing out the torque applied to the cord spool by the power resilient element and the torque applied to the cord spool by the covering material of the blind.

[0012]In the present invention, the guide means guides the suspension cord such that the suspension cord is wound about the cord spool by a specific angle, and with the taper of the cord spool, the suspension cord is arranged on the cord spool in sequence. When the cord spool is connected to the power resilient element as a power source for rotation, the present invention further provides the adjusting means. The adjusting means applies friction force to the cord spool to adjust the torque of the cord spool. When the present invention is applied to the blinds with different sizes, or the power resilient element has an insufficient torque due to the attenuation of the elastic force, the torque applied to the suspension cord by the cord spool can be constant by reducing the friction force. Therefore, the device for winding a suspension cord of a blind provided by the present invention can wind the suspension cord about the cord spool smoothly and can be used for the blinds of different sizes by adjusting the torque applied to the suspension cord by the cord spool. Furthermore, when the elastic force of the power resilient element attenuates, the torque of the cord spool can also be adjusted to achieve the efficacies of being commonly used, conventional assembling, and subsequent adjustment.

Problems solved by technology

However, the structure for winding the suspension cords is complicated and the space for the roller shade bar to move in an axial direction is limited.

Therefore, such structure is unsuitable for a blind with a large size or long suspension cords.

Spiral grooves formed in the surface of the cord spool must increase the manufacturing cost.

However, there is no guide mechanism between the suspension cord and the cord spool, and the portion with a taper is far away from the position where the suspension cord corresponds to the cord spool.

As such, the suspension cord will be easily seized during the later stage of winding the suspension cord due to the absence of the guide of the taper, resulting in the non-smoothness in winding the suspension cord.

The attenuated torque of the spring housing cannot be balanced out with the torque applied to the cord spool by the gravity of the blind.

Therefore, the blind cannot be fixed due to the gravity thereof, and such problem cannot be solved until the spring housing is replaced.

Thus, the gravity of the blind is various, while the torque of the spring housing is constant, resulting in that the spring housing cannot be completely suitable for the blinds with different sizes.

However, the device for winding a suspension cord without using the spring housing often suffers from the problem of the non-smoothness in winding the suspension cord.

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