Cylinder Lock Core Pin Step-Shaped Housing
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Solution Overview
Problem
Cylinder locks with core pins positioned outside the radial plane require significant key movement for secure locking, limiting key variations and increasing production complexity and cost.
Innovation Solution
A cylinder lock design featuring a core pin with step-shaped housing sections and a core pin guide that allows for small key displacements to achieve significant blocking, utilizing a spring-preloaded core pin and magnetic release device for efficient locking and unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If core pins are positioned outside the radial plane to achieve reliable locking, then locking reliability is improved, but key movement distance increases and key variations are limited
Solution Approach 1:
The core pin guide is positioned at an angle of 45° to 60° relative to the radial plane, transitioning from a purely radial arrangement to a three-dimensional configuration. This angular positioning allows the core pin to achieve effective blocking distance with reduced key rotation, resolving the contradiction between locking reliability and ease of operation.
2Reliability
If core pins are positioned outside the radial plane for secure locking, then locking effect is improved, but the number of key variations decreases
Solution Approach 1:
The core pin is divided into functionally distinct segments: a blocking section with locking surfaces for engagement, a transition section with angled surfaces for controlled movement, and a head section for key interaction. This segmentation allows each segment to be optimized independently, maintaining locking effectiveness while enabling greater key code variability through different blocking section configurations.
3Reliability
If core pins are offset from the rotation axis to achieve blocking, then locking capability is improved, but device complexity increases
Solution Approach 1:
The core pin guide is positioned asymmetrically at a specific angle (45° to 60°) relative to the radial plane rather than symmetrically in the radial plane. This asymmetric positioning creates optimal blocking geometry that achieves reliable locking with simpler overall construction, as the angled guide naturally provides both the blocking function and the mechanical advantage for key operation.
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
Enables secure locking with small key movements, increasing key variations, and simplifying production while maintaining cost-effectiveness by allowing precise alignment and movement of core pins for effective locking and unlocking.
Implementation Method 1
The core pin may be spring-loaded within the core pin guide
Implementation Method 2
at least one core pin guide extending outside the radial plane R is provided on one side of the keyway
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
Cylinder lock having a cylinder core (2) which can be rotated in a housing (1), comprising a keyway (7), which runs in a radial plane R and is intended for the insertion of a key (3), wherein a core-pin guide (13) is provided on one side of the keyway (7), wherein there is in the core-pin guide (13) a core pin (6), which is preferably prestressed by a spring (14), can be displaced along its longitudinal axis in the core-pin guide (13) from a blocking position into a release position and has a core side (8), which is oriented in the direction of the keyway (7), and a housing side (9), which is oriented in the direction of the housing (1), wherein the housing side (9) has two blocking portions (4), which project to different extents in the direction of the longitudinal axis (5), the housing side (9) therefore being of a substantially step-shaped form. Also claimed are a key (3) for such a cylinder lock and a locking device of this kind.