Power Shutoff Device Segmented Terminal Assembly
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Solution Overview
Problem
The existing power shutoff devices require complex assembly procedures and risk the fuse dropping off during handling due to the need for multiple bolt dismounting and locking mechanisms, which complicates assembly workability and safety.
Innovation Solution
A power shutoff device design where the fuse is integrated with one terminal portion and a separate second terminal portion, connected via a detachable connecting member, allowing the fuse to be securely fixed to the box using a bolt and lock mechanism, eliminating the need for repeated bolt tightening and reducing the risk of the fuse dropping off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuse is fixed to the first housing by a bolt which fixes the pair of switch terminals, then the fuse can be securely fixed, but the number of assembling steps increases and assembly workability is lowered
Solution Approach 1:
The output portion is divided into a first terminal portion (integrally provided to the fuse and fixed to the box via bolt) and a second terminal portion (separately provided and connected via detachable connecting member). This segmentation allows the fuse to be securely fixed to the box without requiring multiple bolts, as the connecting member handles the external terminal connections. The segmentation resolves the contradiction by separating the fixing function from the connection function, improving assembly workability while maintaining fixing reliability.
2Reliability
If a lock mechanism is provided to lock the fuse to the first housing, then the fuse can be prevented from dropping off, but the device complexity increases
Solution Approach 1:
The lock portion is integrated into the box structure rather than being a separate component. The lock portion includes a locking protrusion that engages with a groove on the fuse holder, forming an integrated locking mechanism within the box. This merging approach prevents the fuse from dropping off during conveyance or assembly without adding significant structural complexity, as the locking function is combined with the existing box structure.
3Reliability
If the second housing is dismounted from the first housing to shut off conduction, then safety is secured, but at least two members must be controlled resulting in lowered assembly workability
Solution Approach 1:
The connecting member is extracted as a separate detachable component that can be independently removed from the box. When conduction needs to be shut off for safety purposes, only the connecting member needs to be detached, rather than dismounting the entire second housing. This extraction of the connecting member as a standalone component simplifies the safety shutdown procedure and improves assembly workability by reducing the number of members that need to be controlled.
Data Source
AI summary
A power shutoff device includes: a fuse to shut off conduction between the input portion connected to a power source side and the output portion connected to a load side; a box having a first face side with the input portion, the output portion, and the fuse to be assembled thereon; and a lock portion to fix one of the input portion and the output portion to the box. The one of the input portion and the output portion is integrally provided to the fuse. The other of the input portion and the output portion includes a first terminal portion integrally provided to the fuse and fixed to the box via a bolt, and a second terminal portion separately provided from the fuse and connected to the first terminal portion via a connecting member being attachable and detachable on a second face side of the box.