Rotating Lever Spring Stabilization Against Abnormal Noise
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Solution Overview
Problem
Existing rotating lever position holding apparatuses generate abnormal noise due to the coil portion of the spring abutting the support portion when the pressing force is reversed, causing the coil to move in the opposite direction of the rotating lever's rotation.
Innovation Solution
A rotating lever position holding apparatus with a spring that includes a coil portion, first and second arms, and a base member with a support portion and spring stopper portion, where the second arm is abutted with the spring stopper portion to ensure the coil is always pressed against the support portion's outer surface, preventing movement and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring is designed to apply pressing force to the rotating lever, then the rotating lever can be held in two positions, but the coil portion moves in the opposite direction of rotation when pressing force is reversed, causing abnormal noise
Solution Approach 1:
A dedicated support portion is introduced as an intermediary element between the base member and the coil portion. This support portion receives and stabilizes the coil portion, preventing it from moving in the opposite direction of rotation when pressing force is reversed, thereby eliminating abnormal noise while maintaining position holding capability
Solution Approach 2:
The support portion is pre-positioned and configured to receive the coil portion before operation. By establishing this preliminary support relationship, the coil portion is pre-prepared to remain stable during operation, preventing opposite-direction movement and noise generation when pressing force reverses
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
Prevents abnormal noise generation by ensuring the coil portion remains pressed against the support portion's outer surface at all times, even when the pressing force direction is reversed, thus stabilizing the rotating lever's positions.
Implementation Method 1
a spring for applying a pressing force in rotating directions to a rotating lever
Implementation Method 2
the coil portion is supported around the support portion... the inner circumferential surface of the coil portion is pressed against an outer circumferential surface of a side of the support portion
Data Source
AI summary
A spring includes a coil portion and first and second arms. The coil portion is supported around a support portion of a base member. The first arm includes a projecting portion that slides the engagement projecting portion in association with rotation of the rotating lever and presses the rotating lever in a direction in which the rotating lever abuts a first stopper portion when the rotating lever is in a first position and in which the rotating lever abuts a second stopper portion when the rotating lever is in a second position. The second arm abuts a spring stopper portion of the base member in a state where a load is exerted in a direction in which the coil portion is wound so that an inner circumferential surface of the coil portion is pressed against an outer circumferential surface of the support portion facing the engagement projecting portion.