Offset Router Base Belt Drive for Quick Motor Unit Insertion
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Solution Overview
Problem
Existing trim routers face difficulties in efficiently attaching and detaching the belt around the pulley due to space constraints and limited accessibility when using offset bases, making the process time-consuming and cumbersome.
Innovation Solution
A router design with a base that includes an input and output shaft with integral pulleys and a belt, allowing the motor unit to be inserted with the belt already wrapped around the pulleys, and a fan for airflow, eliminating the need for manual belt attachment and detachment during insertion and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the belt is looped around the pulley after the motor unit is inserted into the offset base, then the belt can be attached to the correct pulley, but the process becomes difficult and time consuming due to space constraints and limited accessibility
Solution Approach 1:
The belt is pre-looped around the pulley on the motor unit before the motor unit is inserted into the offset base. This preliminary action eliminates the need to manually attach the belt after insertion, resolving the accessibility problem while ensuring correct attachment. The belt is positioned in advance when space and access are more favorable.
Solution Approach 2:
Instead of attaching the belt to the stationary base pulley after motor insertion, the invention inverts the sequence by pre-attaching the belt to the motor unit pulley before insertion. This reversal of the attachment sequence transforms an inaccessible operation into an accessible one.
2Reliability
If the pulley is installed on the motor unit before insertion, then the belt can be positioned correctly, but the process becomes cumbersome due to the additional step of installing the pulley
Solution Approach 1:
The pulley is made integral to the motor unit, merging two previously separate components (pulley and motor unit) into one. This eliminates the need for a separate pulley installation step while maintaining correct belt positioning, as the pulley and motor unit are permanently attached as a single assembly.
3Productivity
If the belt is pre-looped around the pulley, then the motor unit can be quickly inserted into the base, but the belt must remain on the pulley during removal and reinsertion
Solution Approach 1:
The belt is pre-looped around the pulley on the motor unit before insertion, eliminating the need to attach the belt during each insertion operation. This preliminary preparation enables quick insertion while the belt remains securely positioned on the pulley throughout removal and reinsertion cycles.
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 quick and efficient attachment and detachment of the motor unit to the base, reducing operational complexity and enhancing accessibility for cutting in difficult-to-reach areas while providing cooling to prevent overheating.
Implementation Method 1
The base also includes 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
Figure 1
Figure 2
Figure 3~4
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.