Trigger Switch Limiting Mechanism to Prevent Erroneous Presses
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Solution Overview
Problem
Existing trigger switches with removable trigger caps face challenges in preventing erroneous operations, as measures to cut off the main power supply are not always effective.
Innovation Solution
The trigger switch incorporates a limiting member supported by a base shaft member, which transitions between a limited and unlimited state depending on the attachment of the trigger cap, ensuring the trigger only moves to its deepest position after a first press is released.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trigger cap is made removable from the base shaft member, then the appearance and operation feeling can be optimized and unauthorized use prevented, but erroneous operations may occur when the trigger cap is attached to the base shaft member
Solution Approach 1:
The limiting member is configured to limit the trigger movement to a position before the deepest position when the trigger cap is attached, preventing erroneous operations before they can occur. This preliminary restriction on movement ensures safety during the attachment state while allowing full operation when removed.
Solution Approach 2:
The trigger mechanism is divided into separate components: the trigger cap that can be removed and the base shaft member with integrated limiting functionality. The limiting member is further segmented to provide different movement restrictions based on whether the trigger cap is attached or removed, allowing differentiated control states.
2Reliability
If multiple measures are implemented to prevent erroneous operations, then safety is improved, but the device complexity increases
Solution Approach 1:
The limiting functionality is merged directly into the base shaft member structure, with the limiting member being supported by the base shaft member itself. This integration eliminates the need for separate limiting mechanisms while providing effective error prevention, thus improving safety without significantly increasing complexity.
Solution Approach 2:
The base shaft member serves multiple functions: supporting the trigger cap, providing structural integrity, and housing the limiting member that prevents erroneous operations. This multi-functionality reduces the need for additional components, maintaining structural simplicity while enhancing safety.
Data Source
AI summary
A trigger switch TS includes a trigger 1 receiving a press through an operation of an operator to be movable to a deepest position in a press direction. The trigger includes: a base shaft member 11, to which a trigger cap 10 is removably attached; and a limiting member 14, supported by the base shaft member to be operable, and able to limit a movement of the trigger. In the trigger where the trigger cap 10 is attached to the base shaft member, if a first press is received, the movement is limited at a limited position not arriving at the deepest position through the limiting member in a limited state. With removal of the received first press, the limiting member transitions to from the limited state to an unlimited state and, if a second press is received following the removal, it is possible to move to the deepest position.