Chassis Retention Bracket for Lockset Installation
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Solution Overview
Problem
Conventional tubular locksets face challenges in ease of installation due to shifting of the chassis during the installation process, particularly with split spindle configurations and vertically offset mounting posts, which increase installation difficulty.
Innovation Solution
A retention bracket with laterally extending walls, collars, and a deformable section that forms a frictional interference fit with the mounting posts to maintain the chassis in place, resisting axial forces and ensuring proper alignment during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If design clearances are provided to allow mechanisms to assemble with relative ease, then assembly ease is improved, but the latch cannot maintain the chassis in a fixed position during installation
Solution Approach 1:
A retention bracket is introduced as an intermediary component between the latch mechanism and the outside chassis. The bracket includes a collar that receives the chassis and a deformable section that forms an interference fit with mounting posts, thereby mediating between the clearance-based latch mechanism and the rigid chassis positioning requirement.
Solution Approach 2:
The retention bracket utilizes a deformable section whose dimensional parameters change during installation. The deformable section is sized to create an interference fit with the mounting posts, and this parameter change allows the bracket to transition from a loose fit during assembly to a tight, position-stabilizing fit once installed.
2Force
If axial force is imparted to the outside chassis via the spindle or mounting posts, then the chassis shifts away from the door surface, but this shifting increases installation difficulty
Solution Approach 1:
The retention bracket serves as a mediator between the axial forces applied through mounting posts and the chassis position relative to the door surface. The bracket's deformable section absorbs and distributes these forces, preventing direct transmission that would cause chassis shifting.
Solution Approach 2:
The retention bracket is installed beforehand to cushion and absorb axial forces during the installation process. The deformable section acts as a cushioning element that prevents the chassis from shifting away from the door surface when axial forces are applied during mounting.
3Force
If spring load pushes the chassis away from the door surface in split spindle configurations, then the chassis becomes unstable, but this instability increases installation difficulty
Solution Approach 1:
The retention bracket acts as an intermediary between the spring-loaded split spindles and the chassis. The bracket's collar and deformable section provide a stable mounting interface that counteracts the spring load, preventing the chassis from being pushed away from the door surface.
Solution Approach 2:
The retention bracket provides a counterbalancing mechanical interface that opposes the spring load force. The interference fit between the deformable section and mounting posts creates a counteracting force that balances the spring load, maintaining chassis stability during installation.
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 retention bracket enhances the stability of the chassis during installation, allowing for easier and more efficient mounting of the lockset by counteracting the spring load and maintaining the chassis in close proximity to the door surface, thereby simplifying the installation process.
Implementation Method 1
The deformable section has a natural state in which the effective diameter is a first diameter, and a deformed state in which the effective diameter is a second diameter greater than the first diameter
Implementation Method 2
forms a frictional interference fit with the mounting posts to maintain the chassis in place, resisting axial forces
Data Source
AI summary
A retention bracket configured for use with a latch mechanism including a laterally extending housing. The retention bracket includes a first wall, a second wall, a collar, and a deformable section. The first and second walls are longitudinally offset from one another and are structured to receive the housing therebetween. The collar extends longitudinally outward from one of the walls and defines an opening having an effective diameter. The deformable section has a natural state in which the effective diameter is a first diameter, and a deformed state in which the effective diameter is a second diameter greater than the first diameter.