Combination Lock Anti-Pick Dial Clutch Mechanism
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Solution Overview
Problem
Existing combination locks can be picked by intruders due to the ability of clutches to turn with dials in the lock mode, allowing unauthorized access.
Innovation Solution
A combination lock design where each dial is mounted on a different clutch, with a protrusion and open slot arrangement that disengages the clutch from the dial in the lock mode, making it difficult for intruders to pick the lock by preventing clutch rotation with the dials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clutches are allowed to turn with dials in lock mode for ease of operation, then the lock can be opened smoothly, but unauthorized persons can pick the lock by observing protrusion positions
Solution Approach 1:
The clutch is divided into two independent segments: the first segment rotates with the dial during combination input, while the second segment remains stationary relative to the lock body. This segmentation allows the dial to rotate freely for combination entry without exposing protrusion positions to intruders, while still enabling smooth lock opening when the correct combination is entered.
Solution Approach 2:
The dial acts as an intermediary between the user's rotational input and the clutch mechanism. The dial transmits rotational force to the first segment of the clutch only during combination entry, while the second segment of the clutch remains engaged with the protrusion to prevent unauthorized opening. This intermediary mechanism allows smooth operation without compromising security.
2Reliability
If false void zones are added to thwart unwanted opening, then security is improved, but the lock can still be picked by fiddling the combination
Solution Approach 1:
The clutch system transitions from a static engagement to a dynamic two-segment design where the first segment rotates with the dial during combination entry and the second segment remains stationary. This dynamic configuration inherently creates false void zones - positions where the protrusion does not align with the second segment - preventing unauthorized opening without requiring additional structural elements.
Solution Approach 2:
The two-segment clutch design serves multiple functions simultaneously: it allows smooth dial rotation for combination entry, creates inherent false void zones to prevent unwanted opening, and enables the protrusion to engage with the second segment for authorized lock opening. This multi-functional design improves security without significantly increasing structural complexity.
3Ease of operation
If protrusions are made visible for alignment reference, then combination alignment is easier, but intruders can peek the protrusion positions to pick the lock
Solution Approach 1:
The clutch protrusion is segmented into two parts: the first segment rotates with the dial and can have visible alignment markers for user reference, while the second segment remains stationary and engages with the lock body's protrusion reception. This segmentation allows visible alignment references without exposing the critical engagement points to intruders.
Solution Approach 2:
The alignment reference function is moved to the dial face or the first segment of the clutch, while the security-critical second segment operates in a different dimensional plane relative to the lock body. This dimensional separation allows users to see alignment markers without intruders being able to peek the actual protrusion engagement positions.
Data Source
AI summary
A combination lock having a plurality of dials and clutches arranged to control a lock shackle is disclosed. Each of the dials is mounted on a different clutch to form a dial-clutch pair. The clutch has a protrusion and the dial has an open slot dimensioned to receive a protrusion and a plurality of faulty notches. The protrusion is so located that when the lock is in the lock mode, the protrusion in each of the dial-clutch pairs is disengaged from the open slot, allowing the dial to rotate relative to the clutch. Since the clutches do not turn along with the dials and the faulty notches look similar to the open slot, it would be difficult for an intruder to pick the lock by peeking the protrusion of the clutches while rotating the dials.