Eccentric Spring Combustion Chamber Tilting Moment
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Solution Overview
Problem
Existing hand-held tackers experience tilting moments due to the central alignment of the spring force vector, leading to potential jamming and reduced reliability, especially under conditions like dirt or icing.
Innovation Solution
The spring force vector is eccentrically arranged to minimize tilting moments by being radially offset from the central axis, with a linkage system that decouples forces perpendicular to the axis, ensuring smooth operation and reduced jamming risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring force vector is centrally aligned with the combustion chamber axis, then the structure is simpler and symmetric, but tilting moments increase causing jamming and reduced reliability
Solution Approach 1:
The spring force vector is deliberately arranged eccentrically relative to the combustion chamber central axis, creating an asymmetric force distribution. This asymmetric arrangement generates a counteracting moment that compensates for tilting moments from the actuating mechanism, thereby reducing jamming risks and improving operational reliability despite the increased structural complexity.
2Reliability
If the spring force vector is eccentrically arranged to reduce tilting moments, then reliability improves, but the spring positioning becomes more complex
Solution Approach 1:
The eccentric spring arrangement creates a specific local force distribution pattern where the spring is positioned at a predetermined offset from the central axis. This localized asymmetric positioning generates the necessary counter-moment to balance tilting forces, improving reliability while the offset distance is optimized to balance manufacturing feasibility with functional performance.
3Reliability
If the combustion chamber is designed to collapse for safety, then safety function is achieved, but the mechanism may jam under adverse conditions like dirt or icing
Solution Approach 1:
The eccentric spring arrangement proactively generates a counter-moment that prevents tilting before jamming can occur. By anticipating and compensating for tilting moments from the actuating mechanism and environmental factors like dirt or icing, the system maintains smooth movement of the combustion chamber wall during the collapse safety function, preventing jamming before it happens.
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
This design significantly reduces tilting moments and enhances operational reliability by allowing the combustion chamber to collapse safely and maintain contact with the workpiece, minimizing jamming and improving fastening quality.
Implementation Method 1
A force is applied to the movable combustion chamber wall in the axial direction by a spring
Implementation Method 2
a combustion chamber is charged with a combustion gas, with a driving piston being accelerated against the nail after an ignition process
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a drive-in device, comprising a drive-in piston (4) which is guided in a cylinder (3) for driving a nail element into a workpiece and comprising a combustion chamber (2) which is arranged over the drive-in piston (4) and which can be filled with a combustion gas, said combustion chamber (2) comprising a cylindrical portion which is symmetrical about a central axis (A). A movable combustion chamber wall (7) of the combustion chamber (2) can be adjusted along the central axis (A), and a spring (8) is supported between the movable combustion chamber wall (7) and a housing (1a). A force vector (F) of the spring (8) has a lateral offset (V) with respect to the central axis (A).