Tool Clamp Lever Geometry for Lower Removal Force
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Solution Overview
Problem
The existing electric-powered working machines require increased operation load to compress the spring for tool removal, affecting the operability.
Innovation Solution
A working machine design featuring a motor, output part, tool holding part, clamp shaft, urging member, and a lever that rotates to move the clamp shaft, reducing the operation load by optimizing the urging force, lever length, and turning angle to achieve improved operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is used to hold the tip tool in the existing working machine, then the tip tool can be securely held, but the operation load increases when removing the tip tool
Solution Approach 1:
The lever is designed to rotate between a first position (where the tip tool is held) and a second position (where the tip tool is released), dynamically changing the state of tool retention. This rotational movement allows transition from a loaded spring state to a released state, improving ease of operation while maintaining secure holding capability.
Solution Approach 2:
The patent optimizes parameters including the spring constant, lever length, and turning angle to control the characteristic value Q. By adjusting these parameters, the spring force is tuned to provide secure holding while the lever mechanism reduces the operation load required for tool removal, resolving the contradiction between reliability and ease of operation.
2Reliability
If the spring urging force is increased to improve tool holding reliability, then the tool can be held more securely, but the operation load to compress the spring increases
Solution Approach 1:
The lever mechanism dynamically changes the force application state. When the lever is in the first position, the spring provides strong urging force for secure holding. When rotated to the second position, the lever releases this force, reducing operation load. This dynamic state change resolves the contradiction between high holding reliability and low operation load.
Solution Approach 2:
The patent carefully selects the spring constant and lever dimensions to optimize the characteristic value Q. By adjusting these parameters, the spring can provide sufficient urging force for reliable tool holding while the lever mechanism ensures the operation load remains manageable, balancing reliability and force requirements.
3Ease of operation
If the lever turning angle is increased to improve tool detachment, then the clamp shaft movement increases, but the operation load may increase
Solution Approach 1:
The patent optimizes the lever turning angle as a key parameter to control the characteristic value Q. By selecting an appropriate turning angle, the clamp shaft achieves sufficient movement for tool detachment while keeping the operation load within acceptable limits, resolving the contradiction between ease of operation and force requirement.
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 design enhances the operability of the working machine by reducing the operation load required to attach and detach the tip tool, improving ease of use and efficiency.
Implementation Method 1
a compression coil spring made of a metal
Implementation Method 2
an urging member urging the clamp shaft upward
Implementation Method 3
a lever being capable of rotating around a support shaft and being capable of moving the clamp shaft in the up-down direction when being rotated
Data Source
AI summary
An electric-powered tool includes a motor, a unit case, an attachment ring, a clamp shaft, a clamp spring, a tool shaft, and a clamp lever. A term “A” (N) represents a spring load of the clamp spring provided when the clamp lever is located at a first position. A term “B” (mm) represents a lever length from a center position of a support shaft to a position of the clamp lever in a front-rear direction. A term “C” (degree) represents a turning angle from the first position to the second position of the clamp lever. A term “D” (mm) represents a movement amount of the clamp shaft provided when the clamp lever is rotated from the first position to the second position. When a relation of “a characteristic value Q=(A×D)/(B×C)” is established, the characteristic value “Q” is equal to or smaller than 50 (N/degree).