Watch Case Bayonet Lock for Child-Resistant Battery Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing watch cases with quick-release mechanisms pose a risk of accidental access to the battery compartment, particularly by young children, leading to potential ingestion hazards.
Innovation Solution
A watch case design featuring a bayonet joint with a lock that secures the case back to the case middle, preventing relative rotation and requiring a tool for access, thus ensuring secure battery compartment closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a quick-release rotating coupling mechanism is used to allow easy battery replacement, then ease of operation is improved, but security against unauthorized access by children deteriorates
Solution Approach 1:
The locking mechanism is divided into two functional parts: a bayonet connection for quick rotational assembly/disassembly and a separate lock component with slot that requires a specific tool. This segmentation allows the system to provide both easy operation through the rotational mechanism and security through the tool-required lock, resolving the contradiction between ease of battery replacement and protection against child access.
2Ease of manufacture
If a simple slot indentation is provided on the cover for tool reception, then ease of manufacture and ease of operation are improved, but security against inadvertent removal by children deteriorates
Solution Approach 1:
A lock component acts as an intermediary element between the simple slot indentation and the tool. The lock engages with the slot but requires a specific tool with a matching protrusion to operate. This intermediary maintains the manufacturing simplicity of the slot while adding a security layer that prevents children from accidentally removing the cover, as they lack the specific tool needed to activate the lock.
Data Source
Figure 1A~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a watch case (1) comprising a case (3) adapted to receive a movement (8) and a battery (9) housed in a compartment of the movement (8), a case back (2) assembled with a bayonet connection in the case (3) and a lock (6) disposed at the bayonet connection to block any relative rotation between the case back (2) and the case (3).