Adjustable String Line Support for Single-Person Chalk Marking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional string line and chalk line devices require two persons for operation, and any misalignment of the string ends results in incorrect markings or angles.
Innovation Solution
An adjustable string line support system with a slidingly adjustable housing and connector clips that allows a single user to position both ends of the string line at desired heights, enabling single-person deployment and snapping of chalk lines or providing a visual grade reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional string line device is used, then the string can be deployed for slope determination, but two persons are required to operate it
Solution Approach 1:
The support system is divided into two separate housings (first housing and second housing), each independently supportable on vertical members. This segmentation allows a single operator to position both ends of the string line independently, eliminating the need for two persons while maintaining structural simplicity through modular design.
Solution Approach 2:
The patent introduces an intermediary mechanism (the adjustable housing with string engagement features) that enables one person to perform tasks previously requiring two people. The housing acts as a mediator between the operator and the string line, providing mechanical advantage and positioning capability that eliminates the need for a second operator.
2Productivity
If one person positions both ends of the string, then single-person operation is achieved, but maintaining proper alignment and height at both ends becomes difficult
Solution Approach 1:
The housing incorporates adjustable elements that allow dynamic positioning at different heights and locations on vertical members. The ability to adjust the position of each housing independently enables a single operator to achieve precise alignment at both ends of the string line, maintaining measurement precision while enabling single-person operation.
Solution Approach 2:
The system allows changes in positional parameters (height, location on vertical member) of each housing independently. By adjusting these parameters, a single operator can optimize the alignment and tension of the string line between the two housings, ensuring accurate slope determination without requiring two persons.
3Manufacturing precision
If the string is stretched tight between two fixed points, then accurate slope reference is obtained, but the distal end must be held at proper height by a second person
Solution Approach 1:
The housings are pre-configured with string engagement features and positioning mechanisms that allow the operator to establish proper height and position before tensioning the string. This preliminary positioning action ensures that when the string is stretched tight, both ends are already at the correct alignment, maintaining slope measurement accuracy while eliminating the need for a second person to hold the distal end.
Data Source
AI summary
A string line support for the positioning of a first end of a string line used for height measurement or chalk marking is provided, allowing a single user to secure the first end of a string at a desired position and extend the string line to a taught positioning for such height or other linear measurements. The string line is engaged at the first end to a connector clip which is removably positionable in a slot upon a housing that is positionable upon a member.