Electric Screwdriver Switch Structure Preventing Looseness
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Solution Overview
Problem
Existing push-down type electric screwdriver switches are prone to looseness and have a short lifespan, leading to inaccurate and inefficient screw lock operations due to repeated use in industrial applications, necessitating a design that accurately reflects the pressing and releasing state of the screwdriver head.
Innovation Solution
A redesigned electric screwdriver switch structure featuring a structure base with an inner slot, micro-switch, L-rod, spring, and plug pin, which provides pre-stressing and limits movement, ensuring accurate micro-touch detection and secure attachment to the motor, enhancing precision and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a conventional switch combination is used in the push-down type electric screwdriver, then the device can operate continuously, but the switch parts are prone to looseness and have a short lifespan due to repeated use
Solution Approach 1:
The patent integrates the micro touch switch, L-rod, spring, and structure base into a unified assembly where the L-rod is snapped into the inner slot of the structure base and the spring is snapped into the upper end of the L-rod, forming a pre-stressed integrated structure that prevents loosening and enhances reliability
Solution Approach 2:
The spring is pre-installed into the upper end of the L-rod to create pre-stressing before the switch is installed into the structure base. This preliminary action ensures that the switch components remain tightly connected during repeated operations, preventing loosening and extending service life
2Ease of manufacture
If the switch components are loosely assembled, then the installation is simple, but the switch becomes loose after repeated use and fails to accurately reflect the pressing state
Solution Approach 1:
The switch assembly is divided into modular components (micro touch switch, L-rod, spring, structure base) that can be assembled separately and then integrated. The L-rod and spring are pre-assembled with the micro touch switch, and then the entire assembly is installed into the structure base, combining ease of manufacture with secure connection
Solution Approach 2:
The spring is pre-installed into the upper end of the L-rod to create pre-stressing before the switch is installed into the structure base. This preliminary action ensures that the switch components remain tightly connected during repeated operations, preventing loosening and extending service life
3Ease of operation
If the L-rod movement range is unlimited, then the switch operation is simple, but the micro touch switch cannot accurately detect the pressing state
Solution Approach 1:
The plug pin is strategically positioned to press against the inner corner of the upper end of the L-rod, creating a localized constraint that limits the L-rod's movement range. This local quality control ensures that the L-rod moves only within the precise range needed for accurate micro touch detection while maintaining simple operation
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 improved switch structure accurately reflects the micro-touch state, enhances screw lock operation efficiency, and prolongs the service life of the switch by preventing looseness and ensuring reliable motor activation.
Implementation Method 1
the spring have pre-stressing, and limit the movement range of the L-rod
Data Source
AI summary
An improved electric screwdriver switch, wherein the switch is installed in a push-down type electric screwdriver, the lower end of the electric screwdriver is provided with a screwdriver head, and its inside is provided with a thimble; the switch includes a structure base with an inner slot and a micro-switch with a touch rod; the inner slot is provided with a L-rod and a spring, and the micro-switch is electrically connected to the motor of the electric screwdriver; when the electric screwdriver presses down the screwdriver head, the inner thimble is linked, and the upper end of the thimble touches the lower end of the L-rod; the touch distance of the upper end of the L-rod and the touch rod on the micro-switch can determine that the motor drives the start/stop of the screwdriver head; the improved structure base is designed as a whole, it features the strong structure and high precision, it is not easy to loose after installation. It can accurately reflect the micro touch switch, and improve the efficiency of the screw lock operation.