Offset Router Base With Pre-Installed Belt Assembly
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Solution Overview
Problem
Existing trim router offset bases require manual installation of a pulley on the motor unit and looping of a belt around the pulley, which is difficult and time-consuming due to space constraints and limited accessibility.
Innovation Solution
A router design that includes a base with an input shaft and an output shaft, where the belt wraps around pulleys on both shafts, allowing the motor unit to be inserted without removing the belt from the pulley, and a fan for generating airflow within the base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the belt is looped around the pulley after motor unit insertion, then the belt positioning is precise, but the assembly process becomes difficult and time-consuming due to space constraints
Solution Approach 1:
The belt is pre-installed on the pulley before the motor unit is inserted into the base. This preliminary action allows the belt to be positioned accurately while providing ample access, eliminating the difficulty of looping the belt through tight spaces after assembly begins.
Solution Approach 2:
The assembly process is divided into separate steps: first installing the belt on the pulley, then inserting the motor unit into the base. This segmentation allows each component to be prepared independently with proper access, avoiding the constraint of trying to install the belt through limited space after the motor unit is already in place.
2Loss of time
If the pulley is installed on the motor unit before insertion, then the belt can be pre-positioned, but the motor unit assembly becomes more complex
Solution Approach 1:
The pulley is pre-installed on the motor unit shaft before the motor unit is inserted into the base. This allows the belt to be positioned in advance, reducing assembly time during final installation while the modular design keeps the additional complexity contained within the motor unit assembly step.
Solution Approach 2:
The motor unit is designed as a modular assembly that can be prepared independently and then universally installed into the base. The pre-installed pulley becomes an integral part of this universal motor unit module, allowing the same preparation procedure to be used regardless of which base configuration is being assembled.
3Device complexity
If the belt is kept wrapped around pulleys at all times, then assembly complexity is reduced, but the belt may become misaligned during motor unit removal and reinstallation
Solution Approach 1:
The belt is pre-installed and positioned on the pulleys before the motor unit is finalized in the base. This preliminary positioning ensures proper alignment is established early, and the motor unit is then installed in a way that maintains this alignment, avoiding the need to re-align the belt after removal and reinstallation.
Solution Approach 2:
The motor unit is designed with features that maintain belt alignment automatically during installation and removal. The belt's position on the pulleys serves as a self-aligning mechanism, where the pulley geometry and mounting features ensure the belt returns to the correct position without requiring manual realignment after motor unit reinstallation.
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
This design simplifies the assembly process by keeping the belt wrapped around the pulleys at all times, reducing the complexity and time required for setup, and also provides improved cooling through the use of a fan.
Implementation Method 1
a fan configured to generate airflow within the base
Implementation Method 2
The belt wraps around the first and second pulleys to rotationally couple the input shaft to the output shaft
Data Source
AI summary
The present invention provides, in one aspect, a router including a motor unit and a base configured to selectively receive the motor unit to support the router on a work piece surface. The motor unit includes a motor and a spindle configured to output a torque supplied by the motor. The base includes an input shaft configured to selectively couple to the spindle, an output shaft laterally offset from the input shaft, and a belt. The input shaft includes a first pulley and the output shaft includes a second pulley and a tool holder. The belt wraps around the first and second pulleys to rotationally couple the input shaft to the output shaft. When the motor unit is received into the base, the spindle couples to the input shaft.