Router Plane Spring-Loaded Collar for Blade Positioning
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Solution Overview
Problem
Existing router planes face challenges in accurately and repeatably adjusting the depth and position of blades, with limited options for lateral positioning, leading to inefficiencies in cutting and refinement tasks.
Innovation Solution
A router plane design featuring a square cross-section blade shaft that can be secured in multiple rotational positions and adjusted using a spring-loaded collar with a locking mechanism, providing tactile feedback and precise alignment through a telescoping locking pin and V-groove system, allowing for easy blade removal and reorientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collar with thumbscrew is used to hold the blade in place, then the blade can be secured to the body, but the depth of cut and position of blades are difficult to adjust accurately and repeatably
Solution Approach 1:
The collar is designed with a spring-loaded mechanism that provides dynamic tension adjustment. The spring allows the collar to be easily loosened and tightened while maintaining consistent clamping force, enabling repeatable blade positioning. The dynamic nature of the spring-loaded system allows for fine adjustments while maintaining reliability.
Solution Approach 2:
The collar incorporates tactile feedback through the spring mechanism and threading engagement that allows the operator to feel when the blade is properly positioned and when the collar is fully engaged. This haptic feedback system enables accurate positioning without requiring complex measurement tools, resolving the contradiction between ease of operation and positioning accuracy.
2Adaptability or versatility
If a threaded rod with traveling thumbnut is used for blade adjustment, then blade position can be adjusted, but lateral positioning of the blade is limited
Solution Approach 1:
The collar is designed with multiple engagement positions around the blade shaft, allowing lateral positioning in addition to depth adjustment. This multi-dimensional positioning capability enables the blade to be positioned for various cutting applications (edge routing, groove cutting, etc.) without requiring multiple specialized tools, thereby increasing versatility while maintaining relatively simple mechanism complexity.
Solution Approach 2:
The collar serves multiple functions: it secures the blade laterally, adjusts blade depth, and provides repeatable positioning at different locations around the shaft. This multi-functional design eliminates the need for separate mechanisms for each positioning task, achieving versatility without proportionally increasing device complexity.
3Manufacturing precision
If friction alone is used to hold the blade, then the structure is simple, but blade positioning is not accurate or repeatable
Solution Approach 1:
The spring-loaded collar acts as an intermediary between the operator and the blade, providing controlled and consistent clamping force. The spring mechanism mediates the force application, ensuring uniform pressure distribution and preventing blade movement, thereby achieving precise positioning without requiring overly complex securing mechanisms.
Solution Approach 2:
The collar mechanism allows for controlled changes in clamping force parameters through the spring tension and threading engagement. By adjusting these parameters, the system achieves secure blade holding with high positioning precision while maintaining reasonable mechanism complexity. The parameter control enables transition from loose positioning to tight securing as needed.
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
Facilitates precise and repeatable blade positioning and adjustment, reducing backlash and improving cutting accuracy, enabling more versatile and efficient use in various applications.
Implementation Method 1
The spring-loaded blade-clamping collar holds the blade in position when the collar is loosened and provides tactile feedback for controlled blade depth adjustment
Implementation Method 2
a locking knob having a shaft threaded into the collar
Implementation Method 3
a spring loaded, telescoping locking pin is attached in such a manner that the locking collar will be held snugly in position even when the locking knob is not fully tightened
Data Source
AI summary
A router plane having a collar maintained in snug engagement with a blade shank during blade height adjustment to facilitate accurate adjustment with a threaded adjustment nut that travels on an adjustment post. The collar is retained on a post secured to the router plane body so that the collar can rotate between blade in-board and blade out-board positions without removal from the post.