Trigger Locking Mechanism for Portable Power Tools
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Solution Overview
Problem
Existing portable power tools lack a mechanism to simultaneously lock the trigger in both the OFF and ON positions, which can lead to inadvertent actuation or require continuous user pressure for continuous operation.
Innovation Solution
A trigger assembly with a locking mechanism that includes a lock-OFF mechanism to lock the trigger in the OFF position and a lock-ON mechanism to lock it in the ON position, allowing for secure carry and continuous operation without user pressure, respectively, while maintaining an unlocked mode for normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trigger release mechanism is provided to prevent inadvertent activation, then safety is improved, but the device complexity increases due to additional blocking structures
Solution Approach 1:
The patent combines the trigger release mechanism and trigger lock-on mechanism into a single integrated locking assembly. The locking mechanism includes both a blocking structure for the OFF position and another blocking structure for the ON position, unified under a single actuator system. This merging reduces overall device complexity while maintaining both safety functions.
Solution Approach 2:
The locking mechanism serves multiple functions: it can lock the trigger in the OFF position to prevent inadvertent activation, lock the trigger in the ON position for continuous operation, and allow normal trigger operation when unlocked. This multi-functionality eliminates the need for separate mechanisms, thereby reducing device complexity while improving reliability.
2Productivity
If a trigger lock-on mechanism is provided to enable continuous operation, then productivity is improved, but the device complexity increases due to additional blocking structures
Solution Approach 1:
The patent integrates the lock-on functionality into the same locking assembly that provides the lock-OFF capability. The single locking mechanism includes blocking structures that can engage with the trigger at different positions, allowing both lock-OFF and lock-ON functions to be achieved through one unified system rather than separate mechanisms.
Solution Approach 2:
The locking mechanism is designed to provide multiple operational modes: unlocked mode for normal continuous pressure operation, lock-OFF mode for carrying safety, and lock-ON mode for hands-free continuous operation. This multi-functionality enables productivity improvement through continuous operation while avoiding the complexity increase that would result from adding a separate lock-on mechanism.
3Reliability
If both trigger release and lock-on mechanisms are provided, then reliability is improved through comprehensive safety and continuous operation capability, but the device complexity increases significantly
Solution Approach 1:
The patent merges the previously separate trigger release mechanism and trigger lock-on mechanism into a single integrated locking assembly. This locking assembly includes blocking structures that can engage with the trigger at different positions, providing both lock-OFF and lock-ON functionality through one unified mechanism rather than two separate mechanisms.
Solution Approach 2:
The locking mechanism is designed as a multi-functional system that can: (1) lock the trigger in the OFF position to prevent inadvertent activation, (2) lock the trigger in the ON position for continuous operation without hand pressure, and (3) allow normal trigger operation when in the unlocked position. This multi-functionality achieves comprehensive safety and continuous operation capability while minimizing device complexity by eliminating the need for separate mechanisms.
Data Source
AI summary
A power tool includes a housing, a motor enclosed within the housing, and a work element configured to be driven by the motor. A trigger is movably secured to the housing for controlling power to the motor. A locking assembly is provided that includes a lock-OFF mechanism configured to lock the trigger in the OFF position and a lock-ON mechanism configured to lock the trigger in the ON position.