Miter Cut Device Locking Lever Mechanism
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Solution Overview
Problem
Existing miter cut devices struggle to accurately fix and measure a wide range of angles, particularly acute and obtuse angles, due to limitations in pivot angle adjustment and contact flank positioning, which restrict their ability to handle various angled surfaces effectively.
Innovation Solution
A device with a locking lever system that allows the legs to pivot from a stretched to a right-angled position, using a rigid connecting lever with a curvilinear shape and offset fastening points, enabling the device to capture both acute and obtuse angles by positioning cutting guide elements between the intersection lines of outer and inner oscillating flanks, and featuring channels for workpiece contact and saw blade guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking lever is used to fix the pivot angle of the legs, then the reliability of angle fixation is improved, but the device complexity increases
Solution Approach 1:
The locking lever is designed to automatically lock the legs at predetermined angles (45°, 90°, 135°, 180°) through its own mechanical movement, without requiring external locking mechanisms or additional components. The lever's geometry itself provides the locking function, making the system self-sufficient and reliable while avoiding added complexity.
2Measurement precision
If the cutting guide elements are positioned only in the area between the intersection lines of bevel faces, then the measurement precision for acute and obtuse angles is improved, but the device complexity increases
Solution Approach 1:
The device uses a single set of cutting guide elements positioned in the area between the intersection lines of both inner and outer bevel faces, allowing the same elements to serve multiple functions: measuring and guiding cuts for both acute angles (using inner bevel faces) and obtuse angles (using outer bevel faces). This eliminates the need for separate guide elements for different angle types, improving precision while avoiding increased complexity.
3Manufacturing precision
If the legs are limited to pivot only to a right-angled position, then the manufacturing precision is improved, but the adaptability decreases
Solution Approach 1:
The legs are designed with dynamic pivot capability that allows movement to multiple predetermined positions (45°, 90°, 135°, 180°) rather than being fixed at a single right-angled position. The locking lever mechanism enables the legs to be reliably locked at any of these angles, providing both precision for standard angles and adaptability for different cutting requirements through its geometric design.
Data Source
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AI summary
The invention relates to a device for carrying out miter cuts with a central element (1) having cutting guide elements (8, 9) and two legs (2, 2') which interact with a gear unit (10, 11, 11', 20, 20', 21, 21') such that a cutting line (S) runs in an angle bisector of the pivot angle (α) of the legs (2, 2'), wherein each leg (2, 2') has a fixing point (11, 11') for a locking lever (10) with which the pivot angle (α) can be fixed by fixing a distance between the two fixing points (11, 11') along a connecting line (V) drawn through the fixing points (11, 11').It is essential that the locking lever (10) is shaped and articulated to the legs (2, 2') such that, when the legs (2, 2') are pivoted, it remains within the plan view of the legs (2, 2') and the central element (1), with the connecting line (V) not passing through any pivot axis (28, 28') of either leg (2, 2') in any pivot position. The cutting guide elements (8, 9) are to be arranged only in an area between the intersection of two lines (a, a') drawn through the two outer swash plates (3, 3') and the intersection of two lines (b, b') drawn through the two inner swash plates (4, 4').