Electromagnetic Relay Movable Spring Hook Design
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Solution Overview
Problem
Existing electromagnetic relays face difficulties in preventing accidental detachment of the card and in easily inserting the movable spring into the insertion hole due to high friction and design challenges with hooks and insertion holes.
Innovation Solution
The electromagnetic relay features a U-shaped hook on the movable spring that can pass through the insertion hole while being elastically deformed, reducing friction and facilitating easy insertion, with additional design features like recesses and slits on the card's inner surface to enhance ease of insertion and prevent accidental detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hook is bent at 90 degrees to prevent card detachment, then the card can be secured, but it becomes very difficult to insert the hook into the insertion hole
Solution Approach 1:
The hook is designed with a curved shape instead of a sharp 90-degree bend. This curvature allows the hook to flex and deform elastically during insertion, reducing friction and making insertion easier while still maintaining the secure engagement with the card after insertion
2Reliability
If hooks are made with elastic deformability to prevent card drop, then the card can be secured, but the friction between hooks and insertion hole becomes large
Solution Approach 1:
The curved shape of the hook distributes the contact area and reduces stress concentration, allowing the hook to deform elastically with less resistance. This reduces the friction force during insertion while maintaining the elastic deformability needed for secure card engagement
3Adaptability or versatility
If multiple movable springs are aligned along the card's moving direction, then the relay can handle multiple contacts, but inserting each hook into each hole becomes extremely difficult
Solution Approach 1:
The curved hook design allows for easier insertion of multiple springs along the card's moving direction. The elastic deformability and reduced friction enable sequential insertion of multiple hooks without the extreme difficulty encountered with traditional 90-degree bent hooks
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 solution allows for easy and secure insertion of the movable spring into the card, reducing the risk of accidental detachment and lowering the friction between components, thereby improving the reliability and efficiency of the relay's operation.
Implementation Method 1
one end of the movable spring is configured to be able to pass through the insertion hole while being pushed by an inner surface of the insertion hole and being deformed elastically
Implementation Method 2
an electromagnet disposed on the base, an armature supported rotatably by the base so as to swing in response to excitation/non-excitation of the electromagnet
Data Source
AI summary
The electromagnetic relay of the present invention comprises a base (10), an electromagnet (20) disposed on the base, an armature (30) supported rotatably by the base, a movable spring (40) whose one end has a movable contact (41) and the opposite end is secured to the base, a fixed contact (51) disposed opposite to the movable contact, and a card (60). The card has a coupling part (61) to be coupled to the armature and an insertion hole (62) to which the one end of the movable spring is inserted, and it deforms the movable spring elastically in conjunction with a swing motion of the armature to selectively open or close a connection between the movable contact and the fixed contact. The movable spring has a U-shaped hook formed by bending the one end of the movable spring toward the opposite end side, and the hook can pass through the insertion hole while being pushed by an inner surface of the insertion hole and being deformed elastically, and an end of the hook is engaged with the card.