Deadbolt Escutcheon Clip and Set Screw Mechanism
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Solution Overview
Problem
Double-cylinder deadbolt locks lack the ability to securely attach escutcheons of various shapes to the inside cylinder, making it difficult to match the exterior face plate, and existing solutions are limited by the need for round components.
Innovation Solution
An escutcheon assembly featuring a tapered collar with a novel clip and set screw mechanism allows for secure attachment of decorative face plates of any shape to the inside cylinder of a double-cylinder deadbolt lock, using a tapered annular groove and a recessed frame to provide a tamper-proof, leveraged attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional screw-attachment mechanism is used for the escutcheon, then the escutcheon can be securely attached to the cylinder housing, but the escutcheon must be round and cannot accommodate various shapes
Solution Approach 1:
The attachment mechanism is divided into two independent components: a clip member that provides the attachment function and a set screw that provides the securing function. This segmentation allows the escutcheon to be attached securely while accommodating various shapes, as each component can be optimized independently for its specific function without being constrained by the other.
Solution Approach 2:
The clip member acts as an intermediary between the escutcheon and the cylinder housing, providing a flexible attachment interface that can accommodate various escutcheon shapes. The clip member engages with the cylinder housing through a slot and secures the escutcheon in place, while the set screw provides additional securing pressure. This intermediary mechanism enables shape versatility while maintaining attachment security.
2Reliability
If screws are made inaccessible from both interior and exterior face plates for security, then tampering is prevented, but the escutcheon cannot be removed or replaced
Solution Approach 1:
The set screw is extracted from the traditional hidden recess location and repositioned to be accessible from the interior face plate. This allows the escutcheon to be removed or replaced by accessing the set screw from the interior, while the clip member remains inaccessible from both sides to maintain tamper resistance. The extraction of the securing mechanism from the hidden location enables maintenance operations without compromising security.
Solution Approach 2:
Instead of making the escutcheon removal mechanism inaccessible like the security screws, the set screw is made accessible from the interior face plate while the clip member remains inaccessible. This inversion of the accessibility concept allows easy removal through the interior while maintaining exterior security, reversing the traditional approach where all fasteners were hidden.
3Ease of operation
If a clip and set screw mechanism is used, then the escutcheon can be securely attached and easily removed, but the mechanism becomes more complex
Solution Approach 1:
The clip member and set screw are merged into a coordinated attachment system where the clip member provides the primary attachment function through engagement with the cylinder housing slot, and the set screw provides secondary securing by pressing against the escutcheon. This merging of two simple components creates an effective attachment mechanism that is more complex than a single screw but remains straightforward in construction and operation.
Data Source
AI summary
An escutcheon assembly for a deadbolt lock on a door, and particularly for the interior side of a double cylinder deadbolt lock. The escutcheon assembly generally comprises a tapered collar carried on the deadbolt cylinder (and retained by a flange on the cylinder), plus a decorative face plate substantially covering the cylinder and secured to the collar by a novel clip and set screw mechanism. The collar has an annular groove defining opposing walls, the outermost wall (away from the door) having an inwardly angled surface to taper the groove. The decorative face plate has a clip protruding interiorly therein to a distal end that conforms to the tapered annular groove in the collar (for engagement therewith). A set screw is threaded into the frame opposite the clip and protrudes inward behind the aperture to a distal end that likewise conforms to the tapered annular groove in the collar (for engagement therewith). Insertion of the face plate clip into the groove of the collar and tightening of the opposed set screw into the collar self-centers and affixes the decorative face plate over the cylinder flush against the door with a secure tamper-proof attachment, and the decorative face plate may take virtually any outward shape (rectangular, square, etc.) making it much easier to match inside and outside face plates.