Push Button Switch Return Acceleration for Contact Matching
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Solution Overview
Problem
Existing push button switches experience non-matching of contacts during the return operation, leading to safety issues and machine malfunction due to time lags in contact states, particularly when the spring-assisted return operation is resisted by the operator.
Innovation Solution
Incorporation of a return-speed increasing mechanism that applies and releases a load to the push button during the return operation, enhancing the return speed and preventing contact mismatches by increasing the return-operational component force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the push button is returned slowly by operator resistance against spring force, then the operator can control the return operation, but contact non-matching occurs due to time lags
Solution Approach 1:
The inclined surfaces are pre-configured to automatically accelerate the push button during the return operation. As the push button moves upward, the inclined surfaces progressively convert lateral movement into vertical acceleration, ensuring contacts close in the correct sequence before the operator even completes the return motion.
Solution Approach 2:
The return-speed increasing mechanism dynamically adjusts the return speed of the push button during operation. The inclined surfaces create a variable force profile that accelerates the push button as it returns, transforming a static spring-force system into a dynamic acceleration system that prevents contact timing issues.
2Reliability
If the push button return speed is increased to prevent contact non-matching, then contact reliability improves, but the operator must overcome greater spring force
Solution Approach 1:
The inclined surfaces are pre-configured to automatically accelerate the push button during the return operation. As the push button moves upward, the inclined surfaces progressively convert lateral movement into vertical acceleration, ensuring contacts close in the correct sequence before the operator even completes the return motion.
Solution Approach 2:
The return-speed increasing mechanism dynamically adjusts the return speed of the push button during operation. The inclined surfaces create a variable force profile that accelerates the push button as it returns, transforming a static spring-force system into a dynamic acceleration system that prevents contact timing issues.
3Ease of operation
If the spring force is increased to assist push operation, then push operation ease improves, but return operation becomes more difficult and causes non-matching
Solution Approach 1:
The return-speed increasing mechanism dynamically adjusts the return speed of the push button during operation. The inclined surfaces create a variable force profile that accelerates the push button as it returns, transforming a static spring-force system into a dynamic acceleration system that prevents contact timing issues.
Solution Approach 2:
The inclined surfaces change the operational parameters of the return motion by converting lateral displacement into vertical acceleration. This parameter transformation allows the system to maintain spring assistance for push operations while creating controlled acceleration during return to prevent contact non-matching.
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 time lags between contact states during the return operation, ensuring consistent and reliable contact switching without non-matching, thereby maintaining machine safety and functionality.
Implementation Method 1
The movable member (37) is biased toward the cylindrical body (45) by an action of an elastic repulsion of a spring (39)
Implementation Method 2
there is provided a spring (31) as opening biasing means that biases the first and second contacts (17, 19) in an opening/separating direction
Data Source
AI summary
The present invention provides a push button switch that prevents an occurrence of non-matching of contacts. The push button switch 1 includes a push-operatable and return-operatable push button 20, the first and second pairs of contacts C1, C2 that are respectively transferred to an open state by a push-in operation of the push button 20 and transferred to a contact state by a return operation of the push button 20, and a return-speed increasing means that applies and releases a load relative to the push button 20 during the return operation of the push button 20 and that functions to increase a return speed in the return-operation direction of the push button 20. The inclined angles R of the second inclined surfaces 241a, 242a of the respective engagement members 241, 242 is determined such that the second inclined surfaces 241a, 242a function as the return-speed increasing means.