Window Shade Clutch Mechanism for Independent Vane Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional window shades require the panel assembly to be lowered to its bottommost position before it can open, which is inconvenient for light passage and operation.
Innovation Solution
A window shade design featuring a head frame, a reel, a roller, and a clutch system that allows the panel assembly to be switched between open and closed states at any desired height, with the reel and roller connected pivotally to the head frame and the clutch enabling rotational control of the panel assembly through a guide track and slot mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the panel assembly is lowered to the bottommost position before opening, then the panel assembly can be opened for light passage, but the operation becomes inconvenient and time-consuming
Solution Approach 1:
The invention separates the opening function from the lowering function by introducing a roller and clutch mechanism. The panel assembly can be opened independently at any height by rotating the roller, which drives the transversal vanes to tilt without requiring the panel to be lowered to the bottommost position. This segmentation of functions resolves the contradiction by allowing light passage control at any vertical position.
Solution Approach 2:
The clutch mechanism provides dynamic control over the roller's rotation, enabling the panel assembly to be opened at any desired height rather than only at the bottommost position. The clutch can be engaged or disengaged to control the opening action independently of the panel's vertical position, making the operation more convenient and time-efficient.
2Adaptability or versatility
If a simple reel mechanism is used for raising and lowering the panel assembly, then the device construction is simple, but the panel assembly cannot be opened at any desired height
Solution Approach 1:
The roller serves multiple functions: it winds and unwinds the panel assembly for vertical movement, and simultaneously drives the transversal vanes to tilt for opening/closing the panel. This multi-functionality adds adaptability (opening at any height) without proportionally increasing device complexity, as the roller is an existing component in the reel mechanism that is put to dual use.
Solution Approach 2:
The clutch acts as an intermediary mechanism that connects the roller's rotation to the panel assembly's opening/closing action. It mediates between the simple reel mechanism and the desired versatility of opening at any height, adding only the necessary minimal complexity to enable the clutch to engage/disengage and transfer rotational motion to the roller for vane tilting.
3Ease of operation
If the roller is allowed to rotate freely for opening the panel, then the panel can be opened at any position, but the roller cannot be kept stationary when needed
Solution Approach 1:
The spring-loaded lollipop member provides preliminary counter-action to prevent the roller from rotating unintentionally. The spring maintains continuous contact with the guide track, creating a pre-loaded locking condition that opposes any unintended rotation of the roller, ensuring the panel remains at the desired position without drifting.
Solution Approach 2:
The clutch mechanism provides positional feedback through the lollipop member's engagement with the guide track. As the roller rotates to open the panel, the lollipop member follows the guide track's profile, and its engagement depth provides feedback on the roller's position. This feedback mechanism ensures the roller can be reliably held at any stationary position corresponding to a desired panel opening degree.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A window shade includes a reel (132) and a roller (136) pivotally connected with a head frame (102) at two spaced-apart positions, a clutch operatively connected with the roller (136) and switchable between an engaged state preventing the roller (136) from rotating in a first direction and a disengaged state for rotation of the roller (136) in an opposite second direction, and a panel assembly (104) including multiple transversal vanes respectively connected with a first and a second panel. The reel (132) is rotatable to wind and unwind the panel assembly (104) with the first panel remaining in contact with the roller. The panel assembly (104) is switchable between an open state for light passage and a closed state blocking light passage by rotating the transversal vanes. The reel (132) is rotatable in an unwinding direction while the roller (136) is kept stationary by the clutch in the engaged state for switching the panel assembly (104) from the closed to the open state.