Lock Housing Attachment With Rotation-Locking Baseplate Insert
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Solution Overview
Problem
Existing rotation prevention locking systems using spring-loaded pins often lack a tight fit between the housing and baseplate, require additional depth, and are prone to spring loss or misplacement during installation.
Innovation Solution
An attachment system featuring a baseplate with circumferential tracks and cutouts, and a housing with extrusions and a slot, along with an insert that securely fits into the slot and has protrusions that slideably lock into the cutouts to prevent relative rotation between the baseplate and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring-loaded pins are used to prevent rotation, then rotation prevention is achieved, but the fit between housing and baseplate is not tight and additional depth is required
Solution Approach 1:
The locking mechanism is divided into multiple discrete protrusions that engage with separate circumferential cutouts in the baseplate. This segmentation allows each protrusion to independently engage with its corresponding cutout, distributing the locking force across multiple contact points and achieving both rotation prevention and a tight fit without requiring additional housing depth.
2Reliability
If spring-loaded pins are used to prevent rotation, then rotation prevention is achieved, but springs may be lost or misplaced during installation
Solution Approach 1:
The spring element is completely removed from the locking mechanism. Instead of using spring-loaded pins that require careful handling and installation, the design employs protrusions that rely on elastic deformation of the housing material itself to engage with and lock into the circumferential cutouts in the baseplate, eliminating the risk of spring loss or misplacement.
3Ease of operation
If protrusions are made flexible to enable rotation during installation, then ease of assembly is improved, but structural strength may be compromised
Solution Approach 1:
The housing material exhibits different mechanical properties at different locations and under different conditions. The protrusions are designed with localized flexibility only in the specific regions that contact the circumferential cutouts during engagement, while the overall protrusion structure and housing maintain sufficient structural strength. This local flexibility allows the protrusions to elastically deform during installation and then lock firmly in place.
Data Source
AI summary
An attachment system for a locking device mounted to a closure comprises a baseplate fastenable to a mounting surface of the closure, a housing and an insert. The baseplate includes at least one circumferential track having an engagement feature, and a plurality of circumferential cutouts terminating with a catch portion. The housing includes a plurality of extrusions insertable into the at least one circumferential track and engageable with the engagement feature to prevent the housing from being withdrawn from the baseplate in a direction normal to the mounting surface. The housing further includes a slot. The insert is securely insertable into the slot. The insert includes a frame having a plurality of protrusions insertable into the circumferential cutouts in the baseplate. The protrusions are slideably lockable in the catch portions of the circumferential cutouts to prevent relative rotation between the baseplate and the housing.