Lock Handle Assembly Swaying Reduction via Wedge Engager
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Solution Overview
Problem
Conventional lock handle assemblies suffer from swaying and damage due to the allowance between the handle and sleeve, leading to potential deformation of components when subjected to external forces, compromising their coupling strength and security.
Innovation Solution
An engaging member is introduced, screwable into a handle to securely engage with both the handle and sleeve, reducing the allowance and preventing swaying, while a burglarproof member supports the transmission plate to prevent deformation under external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an allowance is provided between the sleeve and handle to prevent the sleeve from getting stuck, then the ease of assembly is improved, but the handle and sleeve sway severely during operation causing damage
Solution Approach 1:
A wedge-shaped engaging member is introduced as an intermediary between the handle and sleeve. This engaging member fits into a wedge-shaped groove on the sleeve and a corresponding groove on the handle, acting as a mediator that connects the two components while eliminating the harmful allowance between them, thus preventing swaying during operation.
Solution Approach 2:
The engaging member is designed to be movable along the major axis direction of the sleeve, allowing it to dynamically adjust its position. This dynamic capability enables the engaging member to accommodate assembly tolerances while maintaining a tight fit during operation, thus resolving the contradiction between ease of assembly and operational stability.
2Ease of repair
If the stopper is made separable by compressing it through a penetration hole, then the ease of disassembly is improved, but the transmission plate deforms when forcibly collided by external force
Solution Approach 1:
The lock mechanism is segmented into distinct functional components: the stopper for controlled disassembly, the engaging member for structural connection, and the wedge-shaped groove for force distribution. This segmentation allows the stopper to be compressed and separated easily while the engaging member and wedge-shaped groove structure maintain strength and prevent deformation under external forces.
Solution Approach 2:
The engaging member is designed with a wedge shape that distributes external forces across a larger area and in multiple directions, rather than concentrating force at a single point. This geometric design in another dimension (wedge angle) allows the transmission plate to resist deformation while maintaining the ease of disassembly function through the stopper compression mechanism.
3Strength
If the engaging member is made movable along the transverse axis to engage with the sleeve, then the coupling strength is improved, but the device complexity increases
Solution Approach 1:
The engaging member combines multiple functions into a single component: it provides structural connection between handle and sleeve, enables movable engagement along the major axis for assembly tolerance accommodation, and prevents swaying during operation. This merging of functions reduces the need for additional separate components, thus limiting the increase in device complexity while achieving enhanced coupling strength.
Data Source
AI summary
A handle assembly of a lock includes a handle, a sleeve, a stopper and an engaging member, wherein the handle comprises an accommodating slot, a lodge hole and a penetrating hole. The sleeve is disposed at the accommodating slot along the direction of a major axis and comprises a through hole. The stopper is disposed at the sleeve and protrudes to the sleeve via the through hole of the sleeve. Owing to the through hole corresponded to the lodge hole, the stopper is lodged in the lodge hole of the handle. The engaging member is disposed in the accommodating slot and adjustably movable along the direction of a transverse axis so that the handle and the sleeve are steadily engaged from each other.