String Holder with Adjustable Insert for Roller Shade Tension
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Solution Overview
Problem
Existing string holders for fabric roller shades lack precision in adjusting string tension, requiring frequent knotting to accommodate elongation, which is inaccurate and inefficient.
Innovation Solution
A string holder with a body and insert system that includes transverse sockets and a longitudinal slot, allowing for adjustable tension by selecting the appropriate socket for the knot, with additional features like recesses, passable holes, and guides to secure the insert and body in place, enabling precise tension adjustment and immobilization during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a monolithic catch with a single slot is used to secure the string, then the structure is simple, but the string tension adjustment accuracy is poor
Solution Approach 1:
The holder is divided into a body and a separate insert with multiple sockets. The insert can be removed and repositioned to different sockets along the slot, enabling precise adjustment of string tension by selecting different insertion positions. This segmentation allows the simple external structure to hide a sophisticated adjustment mechanism inside.
2Device complexity
If the string is secured with a single knot in a fixed position, then the holder structure is simple, but the ability to compensate for string elongation is limited
Solution Approach 1:
The insert is designed to be dynamically repositionable within the body along the longitudinal slot. When the string elongates, the user can remove the insert and reinsert it at a different position along the slot to compensate for the elongation. This dynamic adjustability allows the holder to adapt to changing string conditions while maintaining a simple fixed structure during normal operation.
3Measurement precision
If multiple sockets are provided for knot positioning, then the string tension adjustment accuracy is improved, but the device complexity increases
Solution Approach 1:
The insert containing multiple sockets is nested within the body of the holder. The insert acts as a removable component that houses the multiple positioning options. This nesting approach allows multiple adjustment positions to be integrated into a compact structure without significantly increasing the overall holder complexity, as the sockets are contained within the removable insert rather than requiring separate external components.
Data Source
Figure 1
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AI summary
Holder of a string, in particular for guiding a fabric roller shade, intended mainly for securing and stretching a thin string with at least one local bead, for instance in the form of a knot made on this string, this holder is secured to a stationary component of the structure, in particular to the end of the section guiding the roller shade, fixed to the window sash frame, and also fitted with at least one passable socket for catching the bead on the string secured and stretched. Holder has a body (1, 1a, 1b, 1c), through which the string (3) secured is threaded, seated separably in the catch (4, 4c) secured to a stationary component of the structure, and in the body it has an insert (2, 2a, 2b) with a transverse socket (21) for the bead (1) on the string (3) and a longitudinal slot (220 for this string, in addition, advantageous, at least two sockets are in the insert. The body (1, 1 a, 1 b, 1 c) has a recess open on one side (11) for the insert (2, 2a, 2b), and on the side opposite to the recess inlet it has a passable hole (12) for the string secured (3), in addition advantageously, at least on a part of the insert length there is a negative allowance between this insert and the hole in the body.