Chalk Line Assembly with Extendable Pole for Standing Operation
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Solution Overview
Problem
Conventional chalk line tools require users to kneel, leading to fatigue and potential injury, especially when marking ground surfaces, as they are designed for hand-use and are not suitable for upright operation.
Innovation Solution
A chalk line assembly and method that allows users to mark straight lines from an upright position using a sliding assembly and reel portion, enabling the chalk line to be extended and snapped while standing, with components like a sliding assembly and reel portion allowing for tensioned chalk lines to be laid without bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional chalk line tools are used, then the chalk line can be snapped to mark a straight line, but the user must kneel down which causes fatigue and potential injury
Solution Approach 1:
The patent introduces a vertical dimension to the chalk line operation by using an extendable pole assembly. Instead of operating at ground level (horizontal plane only), the user can extend the pole vertically to reach the marking surface while standing, transforming a ground-level task into an elevated operation that eliminates kneeling.
Solution Approach 2:
The extendable pole acts as an intermediary between the user and the marking surface. The pole transfers the user's standing position to the ground-level marking task, allowing the user to operate the chalk line from an upright position while the pole reaches down to snap the chalk line on the ground surface.
2Measurement precision
If the user kneels to mark ground surfaces, then the chalk line can be snapped accurately, but the work speed decreases and fatigue increases
Solution Approach 1:
By adding the vertical dimension through the extendable pole, the system allows users to maintain accurate chalk line snapping while standing upright. This dimensional addition eliminates the need to compromise between accuracy and productivity by kneeling.
3Ease of operation
If conventional hand-held chalk lines are used, then the device is simple to operate, but it cannot be used from an upright standing position
Solution Approach 1:
The chalk line assembly is designed to perform multiple functions: it can be used with short poles for elevated surfaces and with extended poles for ground surfaces. This multi-functionality allows the same device to adapt to different operating positions and surface heights, eliminating the need for separate tools for different tasks.
Solution Approach 2:
The pole assembly is designed to be extendable and adjustable, allowing the user to dynamically change the pole length based on the marking surface height. This dynamic adjustment capability enables the user to switch between standing and kneeling positions depending on the task requirements.
Data Source
AI summary
In one embodiment of the present disclosure, a chalk line assembly includes a first marking portion for setting a first point, a second marking portion for setting a second point, a first line for marking a chalk line on a surface for at least a portion of the distance between the first point and the second point, the first line having first and second ends and a length extending for at least a portion of the distance between the first and second marking portions, and a second line having a first end and a second end, the first end of the second line coupled to the chalk line, and the second end of the second line connected to the first marking portion.