Nested Combination Lock Wheels Reduce Axial Length
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional combination locks used to secure electronic devices like laptops are typically large due to the separation required for multiple wheels, leading to an unwieldy axial length and weak rivet connections, which compromise durability.
Innovation Solution
A combination lock design featuring marked wheels with a resilient connector that allows inner and outer wheels to rotate together, reducing axial length by eliminating space between wheels and enhancing durability with a secure cap system instead of rivets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple wheels are separated to accommodate connectors and notches for unlocking, then the lock can be properly unlocked, but the axial length of the lock increases making it unwieldly
Solution Approach 1:
The patent merges the inner wheel and outer wheel into a single integrated unit where the outer wheel rotates within the inner wheel's circumference. The connector extends radially from the inner wheel to engage with the outer wheel, allowing both wheels to rotate together as one functional unit. This eliminates the need for separation between wheels while maintaining the unlocking mechanism through the combined rotation of both wheels.
2Ease of manufacture
If a two piece housing connected via rivets is used, then the lock can be assembled, but the connection is weak and easily defeated
Solution Approach 1:
The housing is divided into a first housing portion and a second housing portion that can be assembled together. The connector serves as a structural element that extends through both housing portions, providing a strong mechanical connection. The resilient connecting element engages with the outer wheel while passing through the housing portions, creating a durable assembly that resists defeat better than traditional rivet connections.
3Reliability
If four number wheels are used to ensure sufficient combinations for security, then the total number of possible combinations is large enough, but the lock becomes relatively large in length
Solution Approach 1:
The outer wheel is nested within the inner wheel, with the outer wheel rotating inside the circumference of the inner wheel. The connector extends radially from the inner wheel to engage the outer wheel, creating a compact nested structure. This nesting arrangement allows four wheels to be packed into a minimal axial space while maintaining the four-digit combination capability for security.
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
The lock achieves a reduced axial length while maintaining sufficient security with a four-digit combination, and its durable design resists tampering, making it suitable for securing electronic devices.
Implementation Method 1
a connector configured to fit substantially within the inner wheel and including a resilient connecting element that selectively engages the outer wheel such that the outer wheel, inner wheel and connector rotate together
Data Source
AI summary
A lock includes a cylinder with a locking tab extending axially from a distal end, a rod movable between a locked position and an unlocked position. At least one protrusion on the rod, and a pair of blocking elements positioned adjacent to the locking tab. A marked wheel is rotatably mounted on the rod and cylinder, and includes an inner wheel including a ridge extending from an inner surface and a slot extending through the ridge. The rod slides relative to the cylinder when the slot is aligned with the protrusion on the rod.