Roller Blind Damper With Segmented Position Limits
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Solution Overview
Problem
Existing roller blinds lack upper and lower position limits, leading to potential damage when the blind fabric is lowered or raised excessively, as the weight of the fabric can concentrate at the joint with the roller body, causing damage or separation.
Innovation Solution
A damper system with an inner tube, first and second position-limiting bases, and a damping elastic member is integrated into the roller blind's linkage assembly, allowing for both upper and lower position limits to be set, using sliding bases and securing members to control the movement of the blind fabric and absorb impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If position limitation is provided only during blind fabric lowering process, then the blind fabric can be rapidly lowered without excessive resistance, but the blind fabric may be raised excessively causing damage to the bottom rail or roller body
Solution Approach 1:
The position limiting function is segmented into two independent bases: first position-limiting base for limiting downward movement and second position-limiting base for limiting upward movement. This segmentation allows each base to independently handle specific directional limits without interfering with the other, resolving the contradiction between easy lowering and protection against excessive raising.
Solution Approach 2:
The first sliding base acts as an intermediary component between the linkage assembly and the two position-limiting bases. It translates the rotational movement of the linkage assembly into linear displacement along the inner tube, enabling the system to engage with either position-limiting base depending on the direction of movement, thus providing comprehensive protection while maintaining ease of operation.
2Speed
If the blind fabric is lowered rapidly under gravity, then the lowering speed increases, but the weight of the blind fabric may damage the roller body or split the blind fabric at the joint
Solution Approach 1:
The damping elastic member is pre-installed between the inner tube and the second sliding base to provide beforehand cushioning. When the blind fabric is lowered rapidly, this pre-positioned elastic member compresses to absorb the impact energy, preventing damage to the roller body and blind fabric joint while allowing rapid lowering.
Solution Approach 2:
The harmful impact force generated by rapid lowering of the heavy blind fabric is converted into beneficial elastic potential energy by the damping elastic member. The compression of the elastic member during rapid lowering transforms the harmful kinetic energy into stored elastic energy, which is then released to cushion the bottom rail, turning the potential damage into a protective mechanism.
3Ease of operation
If the bottom rail hits the roller body during excessive raising, then the raising operation continues without limitation, but damage occurs to the bottom rail or roller body
Solution Approach 1:
The second position-limiting base is pre-positioned on the inner tube to provide preliminary anti-action against excessive raising. Before the bottom rail can hit the roller body, the linkage assembly engages with the second position-limiting base through the first sliding base, creating a counter-force that prevents further upward movement and eliminates the harmful impact.
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 solution effectively limits the blind fabric's position during both lowering and raising, preventing excessive movement and damage by engaging the damping elastic member to absorb impact and securing members to stop the blind fabric at predetermined limits, ensuring safe operation and reducing the risk of damage.
Implementation Method 1
a damping elastic member, and the damping elastic member is provided between the inner tube and the second sliding base. When the first sliding base is pushed against the second sliding base, the damping elastic member stores damping elastic potential energy and stops the second sliding base from being rotated.
Implementation Method 2
When the first sliding base is moved away from the second sliding base, the damping elastic member releases the damping elastic potential energy to bring the second sliding base back to its original position.
Data Source
AI summary
Disclosed is a roller blind allowing an upper position limit and a lower position limit to be set by the damper of the roller blind. The damper allows the upper position limit and the lower position limit to be set and includes an inner tube, a first sliding base, a first position-limiting base, and a second position-limiting base. When a blind fabric is driven by a linkage assembly, the first sliding base is driven by the linkage assembly and ends up pushed against the first position-limiting base or the second position-limiting base to stop the linkage assembly from driving the blind fabric. The blind fabric can therefore be limited in position whether it is raised or lowered.