Lock Cylinder With Stationary Annular Disc For Tamper Resistance
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Solution Overview
Problem
Existing locking cylinders with key withdrawal locks suffer from excessive play between the retaining groove and the curvature of the disc, increasing the risk of tampering and manipulation.
Innovation Solution
A locking cylinder design featuring a stationary annular disc with axial groove-like cutouts and a pin engaging with a sliding block on the cylinder housing, ensuring the disc is fixedly arranged, combined with a reversible key that rotates eccentrically relative to the cylinder core, allowing key withdrawal only in defined positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the annular disc is attached directly to the cylinder housing using a retaining groove, then the assembly is simple, but excessive play occurs between the retaining groove and the curvature of the disc, increasing tampering risk
Solution Approach 1:
A sliding block is introduced as an intermediary component between the annular disc and the cylinder housing. The sliding block receives the pin from the annular disc and engages with a groove in the cylinder housing, mediating the connection to eliminate excessive play while maintaining assembly simplicity
Solution Approach 2:
The connection system is segmented into three distinct components: the annular disc with its pin, the sliding block as an intermediate element, and the groove in the cylinder housing. This segmentation allows each component to perform its specific function optimally, with the sliding block absorbing manufacturing tolerances and eliminating play
2Reliability
If the annular disc is made stationary with a pin engaging a sliding block, then security against manipulation is enhanced, but the device complexity increases
Solution Approach 1:
The sliding block serves as a simple intermediary that converts the pin-disc interaction into a secure stationary arrangement without requiring complex locking mechanisms or multiple components
Solution Approach 2:
The pin on the annular disc automatically engages with the sliding block, which in turn engages with the groove in the cylinder housing. This self-engaging mechanism eliminates the need for additional fastening operations or complex assembly steps
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a locking cylinder (10) having a key withdrawal lock, a cylinder housing (11), and a cylinder core (12) rotatably mounted in the cylinder housing (11), wherein a reversible key can be inserted into a keyway (13) of the cylinder core (12), and wherein an annular disc (20) is arranged in a stationary manner behind a cylinder core head (14), wherein the annular disc (20) has at least one axial, groove-like cutout (23) on the inner circumference (21), and wherein the reversible key has grooves on the key shank that extend opposite one another in the radial direction, the dimensions of which correspond to the groove-like cutout (23) of the annular disc (20), and whose position in the axial longitudinal direction on the key shank enables the reversible key, when fully inserted into the keyway (13), to be rotated relative to the stationary annular disc (20).The annular disc (20) has a pin (24) on the outer circumference (22), wherein the pin (24) engages in a groove (31) of a sliding block (30) fixedly arranged on the cylinder housing (11), so that the annular disc (20) is arranged essentially in a stationary manner.