Window Shade Actuating System with Directional Locking Mechanism
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Solution Overview
Problem
Window shades with operating cords and wands require increased user effort due to braking force resistance when raising the bottom part, leading to component wear and operational inefficiency.
Innovation Solution
An actuating system with a sleeve, braking part, brake releasing part, axle coupler, and engaging part that reduces internal friction by allowing the axle coupler and sleeve to rotate freely in one direction while locking in the other, facilitating reduced effort operation and wear reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking part is used to prevent rotation of the sleeve, then the window shade can be held in position, but increased user effort is required to raise the bottom part
Solution Approach 1:
The engaging part transitions from a static locking mechanism to a dynamic selective engagement system. It automatically engages with the axle coupler during downward rotation (lowering) to hold position, while disengaging during upward rotation (raising) to reduce friction and effort. This dynamic behavior resolves the contradiction by making the braking action conditional rather than continuous.
Solution Approach 2:
The engaging part utilizes the direction of rotation itself to control engagement and disengagement. The centrifugal force and geometric design cause automatic engagement when rotation direction changes, eliminating the need for additional actuators or user intervention to control the braking function. The system serves itself by using its own operational parameters to control its state.
2Reliability
If the engaging part is always engaged with the axle coupler, then the sleeve and axle coupler are locked together, but friction increases and component wear accelerates
Solution Approach 1:
The engaging part implements dynamic selective engagement based on rotation direction. During downward rotation (lowering), it engages to provide locking capability. During upward rotation (raising), it disengages to minimize friction and wear. This dynamic on-demand engagement resolves the contradiction between maintaining reliability and reducing component wear.
Solution Approach 2:
The engaging part is extracted from continuous contact with the axle coupler and instead provides intermittent engagement only when needed. This selective extraction of the locking function during specific operational phases (lowering) while removing it during other phases (raising) reduces unnecessary friction and wear while maintaining required locking capability.
3Reliability
If the braking force is continuously applied, then the sleeve remains stationary, but the pulling force must overcome the braking force increasing user effort
Solution Approach 1:
The braking force is transformed from a continuous static force to a dynamic conditional force. The engaging part applies braking force only when the sleeve needs to be held in position (after lowering), and releases it during raising operations. This dynamic application of braking force maintains position stability when needed while eliminating unnecessary resistance during raising, reducing the pulling force required.
Solution Approach 2:
The engaging part prepares the system by automatically engaging during the lowering operation to prevent unintended movement, and then maintains this engagement during the raising operation to eliminate braking resistance. This preliminary engagement action prevents the need to overcome continuous braking force during raising, as the braking mechanism is already disengaged in advance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables easier operation of window shades by reducing friction and wear, allowing for efficient raising and lowering of the movable rail with less user effort and extended component lifespan.
Implementation Method 1
The engaging part is adapted to be in rolling contact with the axle coupler and the inner surface of the sleeve
Implementation Method 2
a braking part operable to apply a braking force for preventing rotation of the sleeve
Implementation Method 3
which can accordingly rotate as the bottom part lowers under gravity action
Data Source
AI summary
An actuating system includes a sleeve, a braking part for applying a braking force to prevent rotation of the sleeve, a brake releasing part, an axle coupler and an engaging part. The brake releasing part is operable to cause the braking part to release the braking force for rotation of the sleeve. The axle coupler is disposed through the sleeve, and is rotatable for raising and lowering a movable rail of a window shade. The engaging part is disposed between and can be in rolling contact with the axle coupler and the sleeve. The engaging part has a coupling position with respect to the axle coupler where the sleeve and the axle coupler are locked to each other in a first direction of rotation, and is movable away from the coupling position for rotation of the axle coupler relative to the sleeve in a second direction of rotation.