Extendable Screed Height and Angle Adjustment Mechanism
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Solution Overview
Problem
Current paving systems with extendable screeds face inefficiencies in adjusting the height and angle of attack, as existing methods are time-consuming and labor-intensive, often requiring manual adjustment of multiple bolts and posts, which is cumbersome and difficult in hot, dirty environments.
Innovation Solution
An adjustment apparatus comprising an upper extender frame, a height tube, a post movably inserted in the height tube, and a lower extender frame with a drive rod and rotatable couplings, allowing independent adjustment of the height and angle of attack through a coordinated but separate mechanism, reducing the need for iterative adjustments at each post.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a four post system is used for adjusting height and angle of attack, then the extendable screed can be adjusted, but the adjustment process becomes very time and labor intensive
Solution Approach 1:
The adjustment system is segmented into independent height adjustment and angle of attack adjustment mechanisms. The height is controlled by a drive rod connected to the lower extender frame, while the angle of attack is controlled by an elongate member connected to the first bracket. This segmentation allows each parameter to be adjusted independently without affecting the other, eliminating the need to adjust multiple posts simultaneously.
Solution Approach 2:
The post assembly serves multiple functions: it provides structural support for the extendable screed, enables height adjustment through the drive rod mechanism, and enables angle of attack adjustment through the elongate member mechanism. This multi-functionality consolidates what would otherwise require separate adjustment systems into a single integrated assembly.
2Adaptability or versatility
If multiple individual bolts and posts are adjusted to change height or angle, then the extendable screed can be repositioned, but the process becomes cumbersome and difficult in hot, dirty environments
Solution Approach 1:
Multiple adjustment functions are merged into a single post assembly. The drive rod for height adjustment and the elongate member for angle of attack adjustment are both integrated into the same post assembly, which is movably inserted in the height tube. This merging reduces the number of separate adjustment points from six or more individual bolts to a coordinated system with fewer adjustment points.
3Adaptability or versatility
If the extendable screed is mounted behind the main screed, then it can be added to increase width, but the extension moves differently than the main body when height or angle of attack is changed
Solution Approach 1:
The post assembly is designed with movable connections rather than fixed rigid mounting. The post is movably inserted in the height tube, allowing dynamic adjustment of the extendable screed's position and orientation. This dynamic capability enables the extension to be precisely aligned with the main screed body after installation, compensating for the initial misalignment caused by mounting behind the main screed.
Data Source
AI summary
An extendable screed has independent height and angle of attack adjustment for a lower extender frame. At least one post and cylinder assembly are used to couple the lower extender frame to an upper extender frame at a pin that allows rotation of the lower extender frame relative to the upper extender frame. A vertical adjuster uses a drive rod with a pivoting attachment at the lower extender frame. An axis of rotation of the pin and an axis of rotation of the pivoting attachment are co-linear. This arrangement allows lower extender frame to move vertically while allowing angle of attack adjustments to be made about the co-linear axes of rotation. Simple screw adjusters displaced from the axis of the pin and collet assemblies allow raising and lowering the back of the lower extender frame to adjust the angle of attack.