Oversized Lamp Base Mounting Holes for Thermal Stress Relief
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Solution Overview
Problem
Dual-leg lamps often fail due to fractures, cracks, or breaks in the bridge, primarily caused by thermal expansion and contraction, which existing lamp bases do not adequately address by allowing for leg movement.
Innovation Solution
A lamp base with oversized leg mounting holes that permit relative movement of the lamp legs parallel to the bridge's longitudinal direction, and optionally gluing only one leg to allow for thermal expansion and contraction without applying glue to the other leg, reducing stress on the bridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If both legs are glued to the base with close interfitting mounting holes, then the assembly strength is improved, but the bridge becomes susceptible to fractures during thermal expansion and contraction
Solution Approach 1:
The mounting holes are designed with oversized dimensions that exceed the leg diameters, creating clearance space that allows the legs to move dynamically during thermal expansion and contraction. This dynamic capability prevents stress buildup that would otherwise cause bridge fractures, while the glue still provides sufficient assembly strength.
Solution Approach 2:
The mounting hole dimensions are changed from tight-fitting to oversized parameters. Specifically, the mounting holes are made larger than the leg diameters, creating a parameter change that enables thermal movement while maintaining structural integrity through the glue bond.
2Reliability
If oversized mounting holes are provided to allow leg movement, then the bridge reliability is improved, but the assembly strength may be reduced
Solution Approach 1:
The mounting hole dimensions are changed from tight-fitting to oversized parameters. Specifically, the mounting holes are made larger than the leg diameters, creating a parameter change that enables thermal movement while maintaining structural integrity through the glue bond.
Solution Approach 2:
The glue acts as an intermediary substance that fills the oversized mounting holes and bonds the legs to the base. This intermediary allows the legs to move within the enlarged holes during thermal cycles while still maintaining sufficient assembly strength through the adhesive bond.
3Adaptability or versatility
If both leg mounting holes are made oversized, then the lamp can accommodate thermal expansion, but the manufacturing precision may be reduced
Solution Approach 1:
The mounting hole dimensions are changed from tight-fitting to oversized parameters. Specifically, the mounting holes are made larger than the leg diameters, creating a parameter change that enables thermal movement while maintaining structural integrity through the glue bond.
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 significantly reduces the risk of bridge damage by allowing the legs to move with thermal expansion and contraction, thereby minimizing stress and extending the lifespan of dual-leg lamp assemblies.
Implementation Method 1
at least one oversized leg mounting hole that permits relative movement of the lamp legs during temperature driven expansion and contraction
Implementation Method 2
both legs of the lamp are glued to the base to provide a strong and durable assembly
Data Source
AI summary
A lamp base for a dual-leg lamp is provided with at least one oversized leg mounting hole that permits relative movement of the lamp legs during temperature driven expansion and contraction. In one embodiment, only one leg of the lamp is glued to the lamp base. The absence of glue on one leg permits essentially free movement of the non-glued leg with respect to the base. In those embodiments that include only a single oversized leg mounting hole, the leg disposed within the oversized leg mounting hole is not glued so that the leg is free to move within the oversized hole. In those embodiments in which both leg mounting holes are oversized, it is acceptable for either (or both) of the legs to be non-glued.