Ratchet Wrench Switch Mechanism Locking for Mode Stability
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Solution Overview
Problem
Conventional three-mode direction-changeable wrenches are inconvenient as the switch mechanism can accidentally move from the second position to the first or third position, causing unintended changes in the ratchet member mode.
Innovation Solution
A three-mode ratchet wrench with a restriction element that locks the switch mechanism at the second position, preventing accidental movement to the first or third position, utilizing a ratchet mechanism with pawls and elastic elements, and a movable restriction element to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the switch mechanism is made movable between first, second, and third positions to enable direction changing, then the versatility of the wrench is improved, but the reliability deteriorates due to accidental movement from the second position
Solution Approach 1:
The restriction element is designed to preemptively counteract accidental movements by providing a mechanical barrier that prevents the switch mechanism from moving away from the second position, thus resolving the reliability issue while preserving the versatility of direction changing
2Reliability
If the restriction element is added to prevent accidental movement, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The restriction element is integrated with existing components of the switch mechanism rather than being a completely separate addition, merging its function into the existing structure and minimizing the increase in device complexity while achieving the reliability improvement
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 effectively prevents accidental mode changes, ensuring the wrench remains stable in the desired mode, enhancing user convenience and preventing unintended ratchet member operation.
Implementation Method 1
The first and the second elastic elements are disposed in the second receiving room and abut against the first pawl and the second pawl respectively so that the first pawl and second pawl tend to move toward the ratchet member
Data Source
AI summary
A three-mode direction-changeable ratchet wrench of the present invention includes a main body, a ratchet member, a ratchet mechanism, a switch mechanism having a toggle piece, and a restriction element. The main body includes a head portion and a handle, and the ratchet member is rotatably disposed to the head portion. The ratchet mechanism includes a first pawl, a second pawl, a first elastic element, and a second elastic element. The switch mechanism is disposed on the head portion. The restriction element is disposed on one of the main body and the switch mechanism and is movable between a restrict position and a release position. Thereby, the restriction element is able to alternatively restrict the toggle piece.