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One way brake for a cordless blind

A technology of brakes and curtains, applied in windows/doors, door/window protection devices, buildings, etc., can solve complex problems

Inactive Publication Date: 2005-08-17
NEWELL WINDOW FURNISHINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] A braking system that overcomes the disadvantages of the more complex and cumbersome systems of the prior art brings significant advances in the field

Method used

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  • One way brake for a cordless blind
  • One way brake for a cordless blind
  • One way brake for a cordless blind

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] Figure 1-10 The embodiment shown in uses a braking mechanism to ensure that the bottom rail does not move (for example by the cumulative weight of the bottom rail and slats or by spring force).

[0048] To ensure that the bottom rail does not move downward without additional force (commonly referred to as "creep"), the combined weight of the bottom rail (BRw) and accumulated curtain (WCw) must be less than the weight including the resistance to downward movement. The downward movement is resisted by the friction of the system (Ffd) and the spring force of the spring motor (SMf). This can be expressed as (BRw+WCw)<(SMf+Ffd). System friction (Ff) tends to resist movement in both directions, although not necessarily with equal force, depending on the source of the system friction. Therefore, the system friction against the bottom rail moving down is denoted as Ffd, and the system friction against the bottom rail moving up is denoted as Ffu.

[0049] In order to ensure ...

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PUM

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Abstract

A window covering including a head rail, a bottom rail, a window covering material extending between the head rail and bottom rail, a first and second lift cords extending between the head rail and the bottom rail, a spring motor configured to bias the bottom rail toward the head rail, mounted in the bottom rail, and operatively coupled to the first and second lift cords, and a brake mounted in the bottom rail and configured to releasably couple to the first lift cord to prohibit the spring motor from taking up the first cord, prohibiting the bottom rail from being raised or lowered.

Description

[0001] Cross References to Related Applications [0002] This application is a non-provisional follow-on (CIP) application claiming priority to the non-provisional application Ser. No. 10 / 016,981, filed December 14, 2001, entitled "Brake for a Cordless Blind." technical field [0003] The present invention relates to a system for removing outer lift cords from shades or blinds. In particular, the present invention relates to window covering systems including the use of one or more springs capable of accumulating the lift cords within the top and / or bottom rails and brakes for securing the bottom rails in a static position as the blinds or shades are raised and lowered. Curtain system with no specific size restrictions. Background technique [0004] Venetian blinds having slats which are raised and lowered by means of a pair of lift cords are known. Such known window coverings generally include lift cords that are secured to the bottom rail and extend up through the slats i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E06B9/322E06B9/60E06B9/90
CPCE06B9/90E06B9/322E06B9/60
Inventor Z·丘卡R·C·帕尔默
Owner NEWELL WINDOW FURNISHINGS