Power Tool Depth Adjustment Mechanism

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Solution Overview

Problem

Existing power tools, such as routers, lack an efficient and convenient mechanism for switching between fine and coarse depth adjustment modes, which limits their versatility and user experience.

Innovation Solution

A depth adjustment mechanism utilizing a worm gear and rack arrangement with a biasing means, such as a conic spring or magnets, allows for easy one-finger operation between fine and coarse adjustment positions, providing precise control and rapid depth changes without mechanical damage over the tool's lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a conventional depth adjustment mechanism is used, then fine depth adjustment is achieved, but switching to coarse adjustment is complex and requires multiple steps

Engineering Contradiction:

Improveease of switching between fine and coarse adjustmentVSAvoidcomplexity of depth adjustment mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The depth adjustment member is designed to be movable between two positions rather than fixed. It can dynamically switch between engaging with the rack assembly for fine adjustment and disengaging for coarse adjustment, allowing the system to adapt its adjustment mode based on user needs without requiring complex separate mechanisms

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The single depth adjustment member serves multiple functions: when engaged with the rack assembly it enables fine adjustment, when disengaged it allows coarse adjustment. This multi-functional design eliminates the need for separate fine and coarse adjustment mechanisms, reducing overall device complexity while maintaining both adjustment capabilities

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If a mechanism involving swinging or rotation is used to move the depth adjustment member, then coarse adjustment is enabled, but user operation becomes more difficult requiring two hands

Engineering Contradiction:

Improveease of actuating depth adjustment memberVSAvoidspeed of switching between adjustment modes

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The movement path of the depth adjustment member is designed along a curved trajectory rather than a straight line. This curved path naturally guides the member from the engaged position to the disengaged position, allowing smooth one-handed operation while ensuring proper alignment and engagement at each position

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The carrier acts as an intermediary component that facilitates the movement of the depth adjustment member. It provides a stable mounting point and guides the movement path, making the switching operation simple and intuitive while maintaining precise control over the engagement and disengagement process

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If no biasing means is used, then the mechanism is simpler, but the depth adjustment member cannot automatically return to the engaged position

Engineering Contradiction:

Improveautomatic return to engaged positionVSAvoidcomplexity of biasing mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The biasing means automatically returns the depth adjustment member to its engaged position with the rack assembly after coarse adjustment is completed. This self-service function ensures the mechanism is always ready for fine adjustment without requiring manual intervention, improving reliability while adding only minimal complexity through a simple spring or magnetic mechanism

Inventive Principle:

Principle #25Self-service

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

Enables seamless switching between fine and coarse depth adjustments with minimal force required, ensuring precision and durability, while maintaining tool stability and ease of assembly.

Implementation Method 1

A conic spring may be provided for biasing the depth adjustment member into the first position

Methodology Applied

Scientific EffectSpring: Spring

Implementation Method 2

Alternatively, such biasing may be accomplished via a pair of magnets that repel one another

Methodology Applied

Scientific EffectMagnetic repulsion: Ion Repulsion/Attraction

Implementation Method 3

The depth adjustment member may be a worm gear and the surface portion of the motor housing may comprise a plurality of teeth which are compatible with the worm gear. Such a worm and rack arrangement provides a convenient mechanism for fine adjustment

Methodology Applied

Scientific EffectWorm drive: Worm Drive

Data Source

PatentUS9144919B2Power tool having depth adjustment mechanism

Publication Date: 2015.09.29 ROBERT BOSCH TOOL

AI summary

A power tool having a depth adjustment mechanism includes a motor housing, a support base for supporting the motor housing, and a depth adjustment member coupled to the support base and movable between two positions. The depth adjustment member in a first position contacts a surface portion of the motor housing and in a second position is distanced from the surface portion of the motor housing such that the movement of the depth adjustment member from the first position to the second position is in a direction parallel to a plane that is substantially tangent to the surface portion of the motor housing.