Coupler for Connecting Multiple Chalk Lines
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Solution Overview
Problem
Current methods for laying multiple chalk lines in construction are time-consuming and unsafe, as they require repeated reeling and reanchoring, often necessitating assistance and increasing the risk of falls due to frequent climbing on scaffolding or ladders, with existing solutions being cumbersome, expensive, or inefficient.
Innovation Solution
A coupler with hooks and clips that allows for the removably attachment and management of multiple chalk lines, enabling users to reel and recharge each line independently while maintaining straight marks, reducing the need for repeated reeling and climbing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a user anchors a chalk line to an attachment point and paces the length of the desired line, then a chalk line mark can be made, but the user must return to re-anchor the chalk line to another attachment point, which takes substantial time
Solution Approach 1:
The chalk line system is divided into multiple segments (multiple chalk lines) that can be independently managed. Each user can work with a separate line segment, eliminating the need to reel and re-anchor a single long line repeatedly. The coupler allows segmentation of the marking task into parallel operations.
Solution Approach 2:
The coupler acts as an intermediary device that connects multiple chalk lines together. This mediator allows users to transfer or exchange line ends without directly handling the chalk lines themselves, streamlining the reanchoring process and reducing time loss.
2Productivity
If a second user assists to alternately fix and move one end of the chalk line, then multiple lines can be made, but the second user must move towards the reel to retain grip on the end of the chalk line, potentially putting him or her at a risk of a fall
Solution Approach 1:
The coupler serves as a safe intermediary that eliminates the need for users to directly grip and move along with the chalk line end. By attaching to the coupler instead of the line end itself, users maintain secure control without the hazard of falling while moving toward the reel.
Solution Approach 2:
The hazardous function of directly gripping and moving with the line end is extracted from the user's task. The coupler assumes this role, allowing users to work from fixed, safe positions while the coupler manages the line transfer and movement.
3Adaptability or versatility
If scaffolding or ladders are used to reach elevated surfaces for chalk line marking, then marking can be performed on vertical or angled surfaces, but the user must climb up and down repeatedly, increasing time spent and risk of fall or injury
Solution Approach 1:
The marking task on elevated surfaces is segmented into independent operations using multiple chalk lines. Users can work simultaneously on different line segments, reducing the frequency and necessity of climbing up and down scaffolding or ladders.
4Productivity
If two users operate a single chalk line alternately, then multiple lines can be made, but repeated reeling is required which takes substantial time
Solution Approach 1:
The single chalk line is segmented into multiple independent lines, each manageable by a different user. This eliminates the need to reel in and re-anchor one long line repeatedly, as users can work with shorter, pre-positioned line segments simultaneously.
Data Source
AI summary
A coupling device for connecting first and second chalk lines includes a generally planar body portion having a first end, a second end and opposed sides edges, an aperture formed in the body portion adjacent to the first end for attaching a free end of a first chalk line to the coupling device, and a spring hook connected to a first of the opposed side edges and being configured to receive a second chalk line.