Pulling cord winding apparatus for window shades

Details Pulling cord winding apparatus for window shades Pulling cord winding apparatus for window shades

2007-12-25

2007-12-25

Johnson, Blair M. (Department: 3634)

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

Venetian blind type

C242S381300, C160S170000

Reexamination Certificate

active

11048913

ABSTRACT:
A pulling cord winding apparatus for window shades includes an upper cap, a lower seat, two elastic take-up reels, two elastic coils, a brake member, and a push rod. The brake member has two arched pressing plates on two sides extended outwards to form respectively a cord pressing member which has second teeth on one side to engage with first teeth formed on cord clamping members on two outer sides of the housing compartment. When pushing the push rod, the brake member is moved and escapes to enable the two elastic take-up reels to rotate and brake. Through the arched pressing plates, cord pressing members and cord clamping members, pulling cords may be retracted smoothly without entangling or forming knobs. When the two elastic take-up reels retract the cords at the maximum force, the pulling cords do not slip, and the window shade may be extended and retracted as desired.

REFERENCES:
patent: 794937 (1905-07-01), Hopkins
patent: 6024154 (2000-02-01), Wang et al.
patent: 6675861 (2004-01-01), Palmer et al.
patent: 6823925 (2004-11-01), Militello et al.
patent: 2005/0205219 (2005-09-01), Hsu
patent: 2006/0175022 (2006-08-01), Cheng
patent: 2006/0175023 (2006-08-01), Cheng

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