Mechanical Bypass Light Unit for Continuous Circuit Operation
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Solution Overview
Problem
Existing light string systems become inoperable when a bulb is removed or becomes loose, due to the creation of a gap in the electrical circuit, and existing solutions face issues with reliability, safety, and high costs.
Innovation Solution
A light unit design featuring a bulb with lead wires and a switch member that includes spring terminals and a separator, allowing the spring terminals to form an electrical short circuit when the bulb is removed, ensuring continuous current flow through the unit, while minimizing exposure of conducting surfaces and enhancing reliability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bulb is removed from the socket, then the light unit can be maintained or replaced, but the electrical circuit is broken and the entire light string becomes inoperable
Solution Approach 1:
A conductive bridge element is introduced as an intermediary component between the two conductive terminals. When the bulb is removed, this bridge element automatically makes contact with both terminals, providing an alternative current path that bypasses the missing bulb and maintains circuit functionality throughout the light string.
Solution Approach 2:
The system transitions from a static circuit configuration to a dynamic one where the conductive bridge element can move between positions. The bridge element is designed to be positioned away from the terminals when a bulb is installed (normal operation), and automatically moves to contact the terminals when the bulb is removed (bypass mode), allowing the circuit to adapt its configuration based on operational conditions.
2Reliability
If spring terminals are used to provide automatic contact when bulb is removed, then circuit continuity is maintained, but memory effects cause switch failure over time
Solution Approach 1:
The spring mechanism is extracted from the system entirely. Instead of using spring-loaded terminals that rely on elastic memory to maintain contact pressure, the invention employs a rigid conductive bridge element that makes contact through its own structural design and positioning, eliminating the wear and memory effects associated with spring mechanisms.
Solution Approach 2:
The mechanical spring-based contact system is replaced with a simpler rigid conductor system. The conductive bridge element uses its inherent structural properties and positioning mechanism rather than elastic deformation to achieve and maintain electrical contact, substituting a more reliable mechanical approach for the failing spring-based system.
3Ease of operation
If spring terminals with long moment arms are used, then contact is achieved when bulb is removed, but the design complexity increases and reliability decreases
Solution Approach 1:
Instead of having the terminals move toward each other across a long moment arm to achieve contact, the design inverts the approach by having a single conductive bridge element extend to contact both terminals simultaneously. This reverses the conventional wisdom of using long lever arms for contact formation and achieves the same result with a more compact, simpler structure.
4Reliability
If the conductive bridge element is positioned away from terminals during normal operation, then bulb function is maintained, but the element must be precisely positioned to ensure proper operation
Solution Approach 1:
The conductive bridge element is designed with an asymmetric structure where one end has a contact portion specifically shaped and positioned to engage with the conductive terminals, while the other end is configured differently. This asymmetric design provides natural alignment and positioning features that guide the bridge element into the correct position during installation, reducing the need for high-precision manufacturing tolerances.
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 design maintains the functionality of the light string by allowing current to flow even when a bulb is loose or removed, improving reliability and safety, and reducing the risk of electric shock and manufacturing costs.
Implementation Method 1
a switch member that includes a support member and a pair of spring terminals
Data Source
AI summary
A light unit includes a bulb having a light source with lead wires and a separator, a switch member that includes a support member and a pair of spring terminals, and a socket having two or more conductive terminals and adapted to receive the bulb and the switch member. The switch member is adapted to cause the pair of spring terminals to contact one another to form an electrical short circuit across the pair of conductive terminals and the light source when the bulb is completely or partially removed from the socket. The lead wires form an electrical connection across the conductive terminals and the separator breaks contact between the pair of spring terminals when the bulb is seated in the socket.