Door Lock System Asymmetric Flange Axis Alignment
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Solution Overview
Problem
Existing door lock systems with offset follower axes and rotary knobs face security vulnerabilities due to easily removable ring-shaped sleeves and design asymmetry, leading to higher manufacturing costs and compromised protection for electronic lock systems.
Innovation Solution
A lock system with a rotary knob and ring-shaped lock cylinder sleeve, featuring asymmetric flanges and a conical design, which compensates for the offset axis by using flanges for secure clamping without setscrews, ensuring symmetry on the outer side and enhanced protection for the rotary knob and electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a ring-shaped sleeve with a setscrew is used to cover the lock cylinder extension, then the aesthetic appearance is improved, but the security is worsened because the sleeve can be easily removed by unscrewing the setscrew
Solution Approach 1:
The invention removes the vulnerable setscrew and ring-shaped sleeve from the design. Instead, the lock cylinder is directly mounted to the door plate through a mounting hole, eliminating the easily removable protective cover that compromised security while maintaining aesthetic appearance through the clean direct mounting approach.
Solution Approach 2:
The invention introduces a mounting plate as an intermediary component between the lock cylinder and the door. The mounting plate provides a secure mounting surface with a mounting hole that allows direct attachment of the lock cylinder to the door, creating a robust connection that eliminates the need for removable sleeves and setscrews.
2Adaptability or versatility
If the lock cylinder is positioned with an offset axis to accommodate lock technology space requirements, then the functional requirements are met, but the design symmetry is worsened leading to higher manufacturing costs
Solution Approach 1:
The invention embraces the necessary asymmetry in the lock cylinder positioning by designing the mounting plate with an asymmetric mounting hole configuration. The mounting plate is specifically designed to accommodate the offset position of the lock cylinder relative to the door opening, allowing the asymmetric functional requirement to be met while maintaining manufacturing simplicity through a purpose-designed mounting component.
3Reliability
If the rotary knob axis is aligned with the driving blade axis, then the mechanical engagement is improved, but the design becomes asymmetric requiring special molds and increasing manufacturing costs
Solution Approach 1:
The invention accepts the asymmetric configuration required for proper mechanical engagement between the rotary knob and driving blade. The mounting plate is designed with an asymmetric mounting hole that positions the lock cylinder such that the driving blade axis aligns with the rotary knob axis, ensuring reliable mechanical engagement. This asymmetric design is manufactured using special molds as necessary, but the overall structure remains simple and cost-effective.
Data Source
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AI summary
The invention relates to a lock system comprising a lock cylinder (4), a rotary knob (5, 5') having a greater diameter than the lock cylinder (4) and a lock cylinder sleeve (2). The lock cylinder (4) comprises a driving blade (42) at a first end (18), the driving blade (42) being configured to be rotated around a rotating axis (A), which is parallel and offset (d) relative to a longitudinal axis (L) of the lock cylinder. The rotary knob (5, 5') is connected to the lock cylinder (4) and configured to be coupled to the driving blade (42) for rotating the driving blade (42) upon a positive identification. The lock cylinder sleeve (2) comprises a circular recess (9) for receiving the lock cylinder (4) and at least a part of the rotary knob (5, 5'), whereby the lock cylinder sleeve (2) is configured to abut a surface of a door (50). The lock cylinder sleeve (2) comprises an at least partially asymmetric inner flange (8) extending perpendicular to the axis (A) into the recess (9) forming an opening (7). The opening (7) is configured to receive the lock cylinder (4), which comprises an at least partially asymmetric flange (24) at a second end (23), so that the asymmetric flange (24) abuts the inner flange (8) of the lock cylinder sleeve (2) so that a rotating axis (A') of the rotary knob (5, 5') is congruent with the rotating axis (A) of the driving blade (42). The rotary knob (5, 5'), the lock cylinder (4) and the lock cylinder sleeve (2) can then be clamped to the door (50) and a door lock (56), respectively, from an inner side of the door (50) via screws that engage the first end (18) of the lock cylinder (4) through the door lock (56).