Rotary Trigger Grip for Electric Tools to Reduce Wrist Strain
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Solution Overview
Problem
The existing electric tools require the user to press a switch in a front-rear direction, which causes strain and discomfort during extended use, particularly affecting the arm and wrist.
Innovation Solution
The electric tool incorporates a rotary trigger mechanism with first and second triggers that rotate orthogonally to the grip's extension direction, allowing operation through a more ergonomic and comfortable motion, reducing user strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a linear pressing switch is used in the front-rear direction, then the switch can be operated with a simple structure, but the user experiences arm and wrist strain during extended use
Solution Approach 1:
The patent transforms the linear pressing motion (one-dimensional front-rear movement) into a rotary motion (two-dimensional circular movement). The trigger member rotates about a rotation axis perpendicular to the grip's extension direction, allowing the user's finger to operate the switch by a natural gripping and rotating motion rather than repeated linear pressing, thereby reducing strain on the arm and wrist.
2Ease of operation
If the switch is positioned for easy access, then the user can operate it conveniently, but the arm and wrist become burdened during prolonged tasks
Solution Approach 1:
By changing the operating motion from linear pressing to rotary movement, the patent enables more natural and less fatiguing finger motion. The rotation axis is positioned so that the trigger extends in the forward direction and rotates when pressed, creating an ergonomic interface that reduces cumulative strain during extended operational periods.
3Ease of operation
If a rotary trigger mechanism is implemented, then user fatigue is reduced, but the device complexity increases
Solution Approach 1:
The trigger mechanism is segmented into distinct functional components: the trigger member itself, the rotation axis, and the connection to the switch. This modular segmentation allows for easier manufacturing, assembly, and maintenance while achieving the ergonomic rotary operation. The trigger member can be independently designed and positioned without affecting the entire switch assembly.
Data Source
Figure 1A~1B
Figure 1C
Figure 2(A)~2(E)
AI summary
This electric tool comprises: a motor; a drive unit operated by driving the motor; a grip; a first rotary shaft which is provided to the grip and extends in the extension direction of the grip; and a first trigger which is exposed on the front side of the grip and rotates in a direction perpendicular to or substantially perpendicular to the extension direction with respect to the first rotary shaft when a portion exposed on the front side is pressed down, wherein the motor operates on the basis of the rotation of the first trigger.