Dual-Spring Door Lock Handle Reset for Stable Neutral Position
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Solution Overview
Problem
Existing multipoint door locks with handles face challenges in balancing the weight and effort required to rotate the handle, leading to unsatisfactory operational experiences due to improper reset spring elasticity, which can cause the handle to swing down or require excessive force.
Innovation Solution
A door lock design incorporating a first elastic element for upward handle rotation and a second elastic element for downward rotation, providing resistance to maintain the handle at the origin position, ensuring effortless operation regardless of handle weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the elastic force of the reset spring is increased to maintain handles of different weights at the origin position, then the handle stability is improved, but the effort required to rotate the handle upward becomes excessive
Solution Approach 1:
The reset spring is divided into two separate elastic elements: a first elastic element that provides restoring force during upward rotation, and a second elastic element that provides restoring force during downward rotation. This segmentation allows each element to be optimized for its specific function, with the second element being softer to reduce rotation effort while the first element ensures proper return to origin position
Solution Approach 2:
Different regions of the elastic force application are made non-uniform by using two elastic elements with different force characteristics. The second elastic element provides softer resistance during downward rotation for ease of operation, while the first elastic element provides appropriate restoring force to return the handle to the origin position, creating localized quality differences in the elastic response
2Ease of operation
If the elastic force of the reset spring is decreased to reduce effort for rotating the handle, then the ease of operation is improved, but the handle swings down from the horizontal position after long-term use
Solution Approach 1:
The reset spring function is segmented into two elastic elements with different force characteristics. The second elastic element has softer elastic force to reduce rotation effort and improve ease of operation, while the first elastic element compensates by providing sufficient restoring force to maintain handle stability and prevent sagging after long-term use
Solution Approach 2:
Two elastic elements with different force characteristics are combined to work together as a unified reset mechanism. The first elastic element (attached to the rotatable connector) and the second elastic element (attached to the housing) merge their functions to simultaneously achieve ease of operation and position stability, with each element contributing its specific strength to the overall system performance
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 dual elastic element system ensures handles remain at the origin position, offering a better operational experience by reducing the effort needed to rotate the handle upwards and preventing swinging, accommodating handles of varying weights.
Implementation Method 1
the first elastic element is at least configured to provide a restoring force for the handle to return to its origin position after the handle is rotated upwardly and released
Implementation Method 2
the second elastic element is configured to provide a restoring force for the handle to return to its origin position when the handle is rotated downwardly and released, as well as to provide enough resistance to maintain the handle at its origin neutral position
Data Source
AI summary
A door lock for a handle, comprises a housing, a rotatable connector inside the housing, a first elastic element and a second elastic element both arranged inside the housing. The rotatable connector is interacted with the handle. The first elastic element is at least configured to provide a restoring force for the handle to return to its origin position when the handle is rotated upward to lock the door, and the second elastic element is configured to provide a restoring force for the handle to return to its origin position when the handle is rotated downward to unlock and open the door, as well as to provide enough resistance to remain handle at its origin position when the handle is released. The door lock is effort-saving for the users to rotate the handle upward, and also adapted for various handles having different weights, to be remained at the origin position when the handle is released.