Pushbutton Combination Lock Dual-Side Independent Code Reset
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Solution Overview
Problem
Existing pushbutton combination locks lack the ability to set different number combinations on both sides of the lock, require manual intervention for resetting, and are not tamper-proof, making them difficult to use and secure.
Innovation Solution
The lock features two series of tumbler members and check slides, a selector that couples with the lock bolt mechanism, and a security slide to prevent tactile feedback, allowing for different combinations on each side and automatic resetting, enhancing usability and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only one series of tumbler members is used with pushbuttons on both sides, then the lock structure is simpler, but different number combinations cannot be set on each side
Solution Approach 1:
The lock mechanism is segmented into two independent subsystems: first tumbler members (40, 41) associated with first pushbuttons (25) on the outer side, and second tumbler members (33) associated with second pushbuttons (25) on the inner side. Each side can be configured with different combinations independently, allowing versatility while maintaining modular structure that manages complexity.
Solution Approach 2:
The lock body (100) serves multiple functions: it houses both sets of tumbler members (33, 40, 41), receives both series of pushbuttons (25), and coordinates both check slides (39) through the selector (59). This multi-functional design enables different combinations on each side without requiring entirely separate lock mechanisms.
2Ease of operation
If manual resetting of tumbler members is required after unlocking, then the mechanism is simpler, but the lock requires frequent intervention and combination visibility compromises security
Solution Approach 1:
The check slide (39) and selector (59) mechanism automatically resets the tumbler members (33, 40, 41) after unlocking occurs. When the lock is actuated, the check slide moves and triggers the selector, which in turn resets all tumbler members to their initial positions without requiring manual intervention, enabling the lock to serve itself.
Solution Approach 2:
The selector (59) provides feedback between the check slide (39) and the tumbler members (33, 40, 41). When the check slide moves during unlocking, it signals the selector to reset the tumbler members, creating a closed-loop system that automatically returns the mechanism to its starting state based on the unlocking action itself.
3Reliability
If the check slide presses against tumbler members during unlocking, then the locking mechanism is simpler, but tactile feedback reveals the combination to intruders
Solution Approach 1:
The selector (59) acts as an intermediary between the check slide (39) and the tumbler members (33, 40, 41). Instead of the check slide directly pressing against tumbler members to indicate the combination, the selector mediates this interaction, preventing direct tactile feedback while still enabling the unlocking function through coordinated movement of all components.
4Ease of manufacture
If multiple elements must be brought into engagement simultaneously to reposition tumbler members, then the locking mechanism is simpler, but changing combinations becomes difficult and requires significant skill
Solution Approach 1:
The selector (59) is pre-configured with cam surfaces (59b) that guide the repositioning of tumbler members (33, 40, 41) during the unlocking cycle. This preliminary design of the cam profiles ensures that when unlocking occurs, the tumbler members are automatically repositioned in the correct sequence and engagement points, eliminating the need for manual alignment skill while maintaining coordinated engagement of multiple elements.
Data Source
AI summary
The lock comprises a lock bolt, in particular a latch bolt (17), the actuating mechanism of which can be locked by means of a locking mechanism which comprises one series of pushbuttons (25) on each side of the lock. The pushbuttons (25) act on code and blocking tumbler members so that when the correct number combination is put in, one of the two check slides (39) is released. A selector (59) couples the two check slides (39) to the lock bolt actuating mechanism so that, when one of the two check slides is released, the lock bolt (17) can be moved to its unlocking position. The lock can thus be unlocked from either side of the lock and, due to the two locking mechanisms, a different number combination can be set for the two sides. The tumbler members each preferably comprise a first tumbler element, consisting of a base element and a code element screwed onto the base element, and a second tumbler arranged in the check slide and biased by means of a spring against the code element. With such tumbler members, it is easier to modify the number combination.