Spring-Centered Screwdriver Attachment for Offset Screw Adjustment
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Solution Overview
Problem
Existing screwdriver attachments for adjusting screws in slot dies and retention bars in devices for producing flat sheet products, particularly large ones, suffer from imprecision and twisting due to thermal fluctuations and tolerance deviations, leading to premature wear and jamming.
Innovation Solution
A screwdriver attachment with a first and second shaft section connected by a linking disk and a spring element, allowing for alignment and compensation of radial offsets, ensuring precise torque application without twisting, and featuring a centering cone for accurate screw engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid screwdriver attachment is used to adjust screws in large slot dies, then the structure is simple and easy to manufacture, but positioning imprecision and twisting occur due to thermal fluctuations and tolerance deviations
Solution Approach 1:
The patent applies the dynamics principle by replacing a rigid shaft with a flexible shaft composed of multiple segmented elements that can bend and adapt to radial offsets. The flexible shaft maintains torque transmission while accommodating positioning deviations caused by thermal fluctuations and tolerance variations, thereby improving adjustment precision without requiring complex active control systems.
Solution Approach 2:
The patent changes the physical parameter of shaft rigidity from rigid to flexible. This parameter change allows the shaft to adapt to varying radial offsets between the screwdriver bit and screw axis, compensating for thermal expansion and manufacturing tolerances while maintaining reliable torque transmission for precise screw adjustment.
2Reliability
If the screwdriver bit is forced to align with an offset screw axis, then torque can be applied, but the screwdriver bit becomes twisted and assumes an undesired tilted position
Solution Approach 1:
The flexible shaft dynamically adapts its shape to align with the screw axis even when there is a radial offset, allowing torque to be applied without twisting the screwdriver bit. The bit remains perpendicular to the screw axis throughout the adjustment process, preventing premature wear and jamming.
3Measurement precision
If positioning precision requirements are increased to eliminate offset issues, then alignment accuracy improves, but the demands on the screwdriver machine positioning system increase
Solution Approach 1:
The flexible shaft acts as an intermediary element between the screwdriver machine's drive axis and the screw to be adjusted. It compensates for radial offsets and misalignments, allowing the positioning system to maintain lower precision requirements while still achieving accurate screw adjustment. The flexible shaft absorbs the alignment errors rather than requiring the positioning system to eliminate them.
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
Ensures reliable and precise adjustment of screws, reducing positioning imprecision and preventing twisting, thereby extending the life of the screwdriver attachment and improving the accuracy of screw adjustments.
Implementation Method 1
The first shaft section and second shaft section are connected to one another by a spring element that aligns the first shaft section in a starting position in which the first longitudinal axis and the second longitudinal axis are aligned coaxially to one another
Data Source
AI summary
The disclosure relates to a screwdriver attachment for screws, which has a first shaft section with a first longitudinal axis, and a second shaft section with a second longitudinal axis. The second shaft section is coupled to the first shaft section via a linking disk. The first shaft section has a free end with which the screws are turned. The first shaft section and second shaft section are connected to one another by a spring element, which aligns the first shaft section in a starting position in which the first longitudinal axis and the second longitudinal axis are aligned coaxially. Screws can be readily turned with the screwdriver attachment according to the disclosure, even if there is a certain offset between the axes.