Terminal Block Cover Interlock for Single-Cover Opening
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Solution Overview
Problem
Existing terminal blocks with multiple covers can unintentionally allow simultaneous opening, posing safety risks when three or more terminals are present.
Innovation Solution
A terminal block design featuring a restriction member that prevents multiple covers from opening simultaneously by using meshing portions on pivot shafts and a restriction member to ensure only one cover can open at a time, with others being restricted through meshing and displacement mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple covers are provided for multiple terminals, then each terminal can be accessed independently, but multiple covers can be simultaneously opened which creates safety risks
Solution Approach 1:
The patent combines multiple cover operations with a single operational input. When one cover is opened, the linkage mechanism automatically opens all other covers simultaneously, merging multiple independent operations into one unified action. This eliminates the safety risk of partial opening while maintaining ease of access.
Solution Approach 2:
The patent introduces a linkage mechanism as an intermediary between the covers. This mediator ensures that cover operations are coordinated - when one cover is opened, the linkage mechanism transmits the motion to open all other covers, preventing any cover from remaining partially closed while others are open.
2Reliability
If a restriction mechanism is added to prevent simultaneous opening, then safety is improved, but device complexity increases
Solution Approach 1:
The restriction function is merged into the existing cover structure through the linkage mechanism. Rather than adding separate restriction devices for each cover, the patent combines the restriction function with the opening mechanism itself, allowing all covers to be opened simultaneously by a single operation.
Solution Approach 2:
The linkage mechanism serves multiple functions: it connects all covers, transmits opening motion, and enforces the restriction that prevents partial opening. This multi-functional design avoids the need for separate complexity-inducing restriction mechanisms for each cover.
Data Source
AI summary
A terminal block includes a plurality of terminals, a housing, a plurality of covers pivotally supported by the housing, each having a pivot shaft and configured to be pivotable, and a restriction member. A meshing portion is provided on the pivot shaft and configured to mesh with each of a plurality of meshed portions provided on the restriction member. When all of the plurality of the covers are in closed positions, the restriction member is positioned in an initial position where each of the plurality of meshed portions is able to mesh with the meshing portion. When a first cover of the plurality of the covers pivots, the meshing portion of the first cover meshes with the meshed portion, and the restriction member is displaced, thereby making the meshing portion in the plurality of the covers other than the first cover unable to mesh with the meshed portion.