Low Profile Deadbolt Assembly Cylinder Nesting
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Solution Overview
Problem
Conventional deadbolt assemblies have a high profile, which is aesthetically undesirable and can be tampered with, as they project significantly from the door surface due to the need to prevent contact between the lock cylinder and the deadbolt latch, compromising security and appearance.
Innovation Solution
A low profile deadbolt assembly design featuring a bolt housing with a longitudinal sleeve, an elongate member, a rotatable crank, and an actuator assembly that allows the lock cylinder to extend past the vertical plane of the elongate member, enabling the bolt to move between retracted and extended positions while maintaining a low exterior profile, and accommodating thin doors without additional adaptors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cylinder body is designed to prevent contact with the deadbolt latch, then the lock mechanism functions reliably, but the projection from the door surface increases, creating a high profile
Solution Approach 1:
The patent repositions the lock cylinder from a conventional lateral arrangement to an arrangement where it extends through the door thickness dimension. The cylinder is received in a recess that extends through the thickness of the door, allowing the cylinder to be positioned on the interior side of the door while still providing exterior access. This dimensional repositioning allows the cylinder to avoid contact with the deadbolt latch while maintaining a low exterior profile.
Solution Approach 2:
The lock cylinder is nested within a recess in the bolt housing that extends through the door thickness. The elongate member is positioned such that the cylinder can be received within the door thickness, effectively nesting the cylinder within the structural boundaries of the door and housing assembly. This nesting allows the cylinder to be protected from latch contact while maintaining minimal projection.
2Reliability
If the cylinder body is positioned to prevent latch contact, then the lock operates securely, but the overall profile becomes larger, making it aesthetically undesirable and vulnerable to tampering
Solution Approach 1:
The patent utilizes the door thickness dimension to reposition the lock cylinder from a conventional exterior-protruding arrangement to an arrangement where the cylinder extends through the door thickness. The cylinder is received in a recess that extends through the thickness of the door, allowing the cylinder to be positioned on the interior side of the door while still providing exterior access. This dimensional repositioning allows the cylinder to avoid contact with the deadbolt latch while maintaining a low exterior profile.
Solution Approach 2:
The patent extracts the lock cylinder from its conventional position in the exterior protrusion and repositions it within the door thickness. The cylinder is received in a recess that extends through the thickness of the door, effectively removing it from the exterior profile while maintaining functional access. This extraction allows the cylinder to be secured away from the latch while preserving lock operation.
3Reliability
If conventional deadbolt assemblies are used on thin doors, then the lock mechanism functions, but additional adaptors are required to accommodate the door thickness
Solution Approach 1:
The bolt housing is designed with a recess that extends through the thickness of the door, creating a universal mounting structure that accommodates various door thicknesses. The elongate member and crank mechanism are configured to work within this recess without requiring additional adaptors. This universal design allows the same basic assembly to function on thin doors while maintaining lock mechanism reliability.
Solution Approach 2:
The patent modifies the geometric parameters of the bolt housing and elongate member to accommodate thin door thickness. The recess in the bolt housing is designed with specific dimensions that allow the lock cylinder to be received within the door thickness. The elongate member is configured with appropriate length and positioning to ensure proper engagement with the crank and cylinder on thin doors, eliminating the need for additional adaptors.
Data Source
AI summary
A deadbolt assembly includes a bolt housing having a longitudinal sleeve defining a first axis. A bolt is located in the longitudinal sleeve. An elongate member has a first end and a second end portion opposite the first end, the first end being attached to the proximal end of the bolt and the second end portion having a first connector. A rotatable crank has a pivot member, a second connector and an arm. The second connector of the crank is operationally engaged with the first connector of the elongate member. A first actuator assembly has a body, a lock cylinder, and a tailpiece that extends from the lock cylinder and is rotatable around a second axis with respect to the lock cylinder. The tailpiece is engaged with the pivot member of the crank. At least a portion of the lock cylinder extends past a vertical plane of an outer side surface of the elongate member.