Handle-Returning Device for Cylinder Lock Assembly
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Solution Overview
Problem
Cylinder lock handle-returning devices face high torsional stress due to the heavier and eccentrically configured lever handles, leading to potential droop and fatigue failure of the torsion spring, as well as risk of tubular spindle twisting or breaking under prolonged use.
Innovation Solution
A handle-returning device with a reinforced structure comprising a support base, rotation driver, torsion spring, and cover plate, featuring annular sections, spring-retaining lugs, and interlocking elements to distribute stress and maintain stability, including a torsion spring positioned between the support base and rotation driver with spring legs abutting against lugs and driving elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lever handle with L-shaped configuration and eccentric center of gravity is used, then the operating leverage is improved, but high torsional stress is imposed on the tubular spindle and handle-returning device
Solution Approach 1:
The handle-returning device is segmented into multiple functional components: a rotation driver with spring driving elements, a support base with spring-retaining lugs, and a torsion spring. This segmentation allows each component to bear specific loads, distributing the torsional stress across multiple elements rather than concentrating it on a single structure.
Solution Approach 2:
The invention introduces a multi-dimensional structural arrangement by positioning spring driving elements radially aligned with spring-retaining lugs, and placing the torsion spring in a vertical plane between the rotation driver and support base. This spatial distribution in multiple dimensions enhances the structure's ability to resist torsional stress from the eccentric lever handle.
2Ease of operation
If the operating lever handle is used instead of a knob, then the operating force is improved, but the torsion spring is liable to fatigue failure after long time use
Solution Approach 1:
The invention merges the rotation driver, support base, and torsion spring into an integrated assembly where the spring driving elements and spring-retaining lugs work together. This merging creates a unified stress distribution system that reduces localized fatigue on the torsion spring, thereby improving reliability under repeated operation.
Solution Approach 2:
The torsion spring is pre-positioned between the rotation driver and support base with spring legs abutting against spring-retaining lugs, creating a cushioning effect that absorbs and dissipates torsional shocks before they can cause fatigue failure. This beforehand cushioning protects the spring from cumulative damage during long-term use.
3Device complexity
If a simple handle-returning device structure is used, then the device complexity is reduced, but the structure is insufficient to oppose high torsional stresses
Solution Approach 1:
The handle-returning device is divided into distinct functional segments: the rotation driver containing spring driving elements, the support base with spring-retaining lugs, and the torsion spring itself. This segmentation provides a reinforced structure capable of withstanding high torsional stresses while maintaining reasonable assembly simplicity through modular design.
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 opposes high torsional stresses, ensuring the lever handle returns to its original position without fatigue failure, stabilizing the rotation driver and preventing spindle twisting, thereby enhancing the durability and reliability of the handle-returning mechanism.
Implementation Method 1
a torsion spring disposed around the inner annular flange and between the annular base wall and the annular plate, and having at least one spring leg abutting against the spring-retaining lug and the spring driving element
Data Source
AI summary
In a handle-returning device of a cylinder lock assembly, a support base has an inner annular flange and an axial spring-retaining lug. A rotation driver has an inner tubular wall extending into the inner annular flange of the support base, and a spring driving element. A torsion spring is disposed around the inner annular flange and between the support base and the rotation driver, and has a spring leg abutting the spring-retaining lug and the spring driving element. A rotary plate abuts the support base opposite to the rotation driver, and has an engaging part engaging a tongue projecting from the rotation driver. A reinforced structure is thus provided to oppose high torsional stresses produced upon rotation of a lever handle.