Pull Cord Mechanism for a Window Shade

Abstract

A pull cord mechanism for a window shade includes a frame (1), a shade (2), a shade driving mechanism (3), and a pull cord (4) for driving the shade driving mechanism (3). The shade driving mechanism (3) is fixed to the frame 1 and drives the shade (2) to fold and unfold. A barrel (5) is mounted to the frame (1) at a location corresponding to the pull cord (4). The barrel (5) includes a peripheral wall having a slit (7) extending in an axial direction. A sliding block (8) is slideably received in the barrel (5). A handle (9) is mounted to an outer periphery of the peripheral wall of the barrel (5). The sliding block (8) is connected to the handle (9) by a link (10) extending through the slit (7). The pull cord (4) is received in the barrel (5). The sliding block (8) is fixed to the pull cord (4) in the barrel (5).

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a pull cord mechanism for a window shade.[0002]As disclosed in U.S. Patent Publication No. 2011 / 0011543 A1 (China Patent Application No. 200910041286.7), the pull cords of currently available pull cord mechanisms for driving the shade driving mechanisms of window shades are exposed. Driven by the playful nature, a child often plays the pull cord as a toy. However, the pull cord is soft and has an end fixed to the window shade, such that the pull cord is liable to tangle the child by the neck and, thus, causes danger, which potential risk has not yet been effectively solved by now.BRIEF SUMMARY OF THE INVENTION[0003]An objective of the present invention is to provide a pull cord mechanism for a window shade capable of effectively preventing the pull cord from tangling a child.[0004]The present invention fulfills the above objective by providing a pull cord mechanism including a frame, a shade, a shade driving mechanism...

AI Technical Summary

Benefits of technology

[0003]An objective of the present invention is to provide a pull cord mechanism for a window shade capable of effectively preventing the pull cord from tangling a child.

[0004]The present invention fulfills the above objective by providing a pull cord mechanism including a frame, a shade, a shade driving mechanism, and a pull cord for driving the shade driving mechanism. The shade driving mechanism is fixed to the frame and drives the shade to fold and unfold. A barrel is mounted through a hook to the frame at a location corresponding to the pull cord. The barrel includes a peripheral wall having a slit extending in an axial direction. A sliding block is slideably received in the barrel. A handle is mounted to an outer periphery of the peripheral wall of the barrel. The sliding block is connected to the handle by a link extending through the slit. The pull cord is received in the barrel. The sliding block is fixed to the pull cord in the barrel. In operation, the handle is moved to move the sliding block upward or downward in the axial direction. Thus, the sliding block moves upward or downward in a passageway in the barrel, actuating the pull cord to move upward or downward, which, in turn, drives the shade driving mechanism to fold or unfold the shade. Since the pull cord is received in the passageway of the barrel, children are prevented from being tangled by the pull cord, assuring use safety of the shade.

[0005]To prevent the pull cord from entangling while it is being pulled, an end cap is mounted to a tail end of the barrel to effectively prevent the sliding block from moving out of the barrel.

[0006]To allow repeated smooth movement of the pull cord, the handle is a sleeve including a hole having a shape of cross sections corresponding to that of the cross sections of the barrel.

[0008]To increase the sliding effect of the sleeve, the sleeve and the sliding block are made of plastic.

[0009]Compared to the current techniques, the present invention can effectively prevent the pull cord from tangling a child, providing use safety.

Problems solved by technology

However, the pull cord is soft and has an end fixed to the window shade, such that the pull cord is liable to tangle the child by the neck and, thus, causes danger, which potential risk has not yet been effectively solved by now.

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