Interchangeable Jaw Pliers With Spring-Assisted One-Hand Clamping
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Solution Overview
Problem
Existing locking pliers, such as vice grip and water pump pliers, face environmental concerns due to manufacturing methods like investment casting, which produce harmful emissions, and require complex mechanisms that are difficult to adjust and prone to clamping errors, leading to damage or distortion of workpieces.
Innovation Solution
A stamped flat metal laminate construction with pivotally retained jaws and a resilient compression spring mechanism, allowing for one-handed operation and adjustable clamping pressure, combined with a simplified locking mechanism using a rocker switch and interchangeable jaws for versatile use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If investment casting method is used to manufacture pliers, then intricate jaw shapes and robust construction can be achieved, but harmful emissions and environmental damage occur
Solution Approach 1:
The patent replaces the traditional investment casting process with a stamping and forming process. The pliers are manufactured by stamping metal sheets and forming the components, eliminating the need for wax moulding, refractory shell creation, and high-temperature casting that produces harmful emissions. This mechanical substitution maintains structural integrity while removing environmental harm.
2Reliability
If pre-adjusted clamping pressure with adjustment screw is used, then clamping pressure can be predetermined, but several attempts are required to correctly adjust the screw to the required position
Solution Approach 1:
The patent replaces the static pre-adjusted clamping mechanism with a dynamic spring-based system. The compression spring automatically adjusts to provide the required clamping pressure, allowing the user to simply squeeze the handles without needing to pre-adjust any screws. The spring compresses during closure and maintains optimal pressure, eliminating adjustment time while preserving reliable clamping control.
3Reliability
If locking mechanism with over centre linkage is used, then jaws can be retained in closed position, but clamping pressure is slightly released during locking procedure
Solution Approach 1:
The patent incorporates a compression spring that is pre-compressed to store elastic energy before the locking action occurs. As the handles close, the spring compresses further, and when the locking mechanism engages, the spring's stored energy maintains continuous clamping pressure without the pressure release associated with over-centre linkage. The spring acts as a cushion that compensates for pressure fluctuations during the locking procedure.
4Strength
If considerable initial width between fixed and moving handles is used, then robust construction is achieved, but two-handed operation is required
Solution Approach 1:
The patent reconfigures the handle arrangement from a wide lateral separation to a more compact configuration where the handles are positioned closer together. This dimensional change allows the handles to be operated with one hand while maintaining the robust construction through optimized material usage and structural design in the stamped components. The force triangle geometry is adjusted to achieve both compactness and strength.
5Ease of manufacture
If toothed arc of strut remains in substantially the same locking angle, then simple manufacturing is achieved, but compensation for angle changes during resilient flexing is not provided
Solution Approach 1:
The patent makes the toothed arc of the strut dynamic rather than fixed. The toothed arc is designed to rotate relative to the strut, allowing it to change its locking angle in response to the resilient flexing of the handles during operation. This dynamic adjustment maintains proper tooth engagement despite angle changes, ensuring reliable locking while keeping the manufacturing process relatively simple through the use of standard forming techniques.
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 solution provides ergonomic, efficient, and cost-effective pliers with reduced environmental impact, enabling precise clamping without damage, suitable for various tasks with interchangeable jaws and a simplified, low-maintenance design.
Implementation Method 1
an arc shaped resilient portion or alternately a strong compression spring held laterally around apposing overlapping lengthwise members incorporating abutment profiles which act against the said strong compression spring ends
Implementation Method 2
the chosen level of resilient compression resistance, is in best practice incorporated within the moving handle actuation arm portion, such that when operating the present pliers, by virtue of the employed, arced resilient portion or compression spring this can impart an extremely practical strong sprung clamping pressure upon the clamped workpiece
Data Source
AI summary
Everyway Pliers 1 comprising fixed and pivotal gripping jaws 206, 301 operated by fixed and moving handles 200, 400 wherein a force triangle 800 is formed with its base 801 between the pivotal jaw 300 actuation pivot pin 60 land the fixed handle 200 to pivotal strut 500 pivot pin 601, the triangles apex 802 formed within the pivotal strut outer pivot bore 502 and moving handle central pivot point 402. As the operator clenches CF the moving and fixed handle grips 413, 212 said triangles apex 802 is propelled towards said triangle base 801, forcefully elongating said base 801, further forcefully rotating the pivotal jaw 300 towards the closed position around the pivotal jaw pivot bore 302, the combination of said rotational and elongation closure forces employed provides extremely robust gripping jaw 301, 206 closure, by one or smaller hands. Optionally incorporating interchangeable push fit jaws 900, utilizing near identical curved locking blade and abutment profiles 901, 902 with strong magnets 905 located within the jaw stub blade channel 903 tips, providing substantial initial interchangeable jaw 900 retention.