Adjustable Lever Plate Mechanism for Tight-Space Angle Release
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Solution Overview
Problem
Existing lever devices for portable circular saws face difficulties in adjusting the mounting angle due to component deformation, making it hard to loosen the lever, especially when the lock position shifts close to the base, making it challenging to access the gap between the lever and the base.
Innovation Solution
A lever device with a bolt, nut, first plate, and second plate, featuring non-circular shapes for engagement, allowing relative rotation and enabling easy angle adjustment without tools, using a fulcrum mechanism between the plates to change the mounting angle, facilitating operation in a narrow space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lever is positioned adjacent to the base when completely fastened to save space, then the device compactness is improved, but the ease of operation deteriorates because fingers cannot access the gap between the lever and base to loosen it
Solution Approach 1:
The lever device allows dynamic adjustment of the mounting angle between the lever and nut. When the lever is completely fastened, it can be positioned adjacent to the base for compactness. When loosening is needed, the mounting angle can be changed to create space for finger access. This dynamic adaptability resolves the contradiction between compactness and operability.
Solution Approach 2:
The mounting angle of the lever to the nut is changed as a parameter to resolve the contradiction. By adjusting this angle, the lever can be positioned close to the base for compactness during fastening, or repositioned away from the base for easy access during loosening operations.
2Volume of moving object
If the mounting angle of the lever to the nut is fixed to enable compact positioning, then the device compactness is improved, but the adaptability deteriorates because component deformation shifts the lock position and prevents proper operation
Solution Approach 1:
The lever device transitions from a fixed mounting angle configuration to a dynamic one where the mounting angle can be adjusted. This allows the device to adapt to component deformation and maintain proper operation even when the lock position shifts due to repeated use or manufacturing tolerances.
Solution Approach 2:
The mounting angle parameter is made adjustable to compensate for component deformation. When deformation occurs and shifts the lock position, the user can change the mounting angle to restore proper lever positioning and functionality, thereby maintaining adaptability while preserving compactness.
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
Enables easy adjustment of the mounting angle without requiring access to the bolt's vicinity, improving operability and maintaining compactness, even in tight spaces, by allowing relative rotation and simplifying the lever device's configuration.
Implementation Method 1
the first plate is rotated around a fulcrum positioned between the first engagement part and the second end part in the crossing direction so that the first plate is moved from an engaged position where the first engagement part and the non-circular part are engaged with each other to a non-engaged position
Data Source
AI summary
A lever device is configured such that, when first and second plates are relatively moved in a direction in which a second end part of the first plate and a fourth end part of the second plate are close to each other from a state in which the second end part and the fourth end part are separated from each other in an axial direction of a bolt, the first plate is rotated around a fulcrum positioned between a first engagement part and the second end part in the crossing direction so that the first plate is moved from an engaged position where the first engagement part and a non-circular part of the bolt or a nut are engaged to a non-engaged position where they are not engaged, and thereby removing a restriction of the relative rotation of the first plate to the non-circular part.