Rotatable Cutting Arm Assembly for Roofing Shingles

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Solution Overview

Problem

Existing cutting apparatuses for roofing shingles are cumbersome and provide inferior cutting performance compared to utility knives, which are preferred for their portability and ease of use.

Innovation Solution

A portable cutting apparatus with a frame assembly, rotatable cutting arm, alignment mechanism, and selectively attachable guide fence, featuring biasing members and an extendable handle, allowing for precise angular cuts and easy blade replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If existing cutting apparatuses are used, then cutting performance is provided, but portability and ease of use deteriorate

Engineering Contradiction:

Improveease of useVSAvoidcumbersomeness

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The cutting apparatus is divided into separate modular components including a frame assembly, cutting arm assembly, and alignment mechanism that can be independently assembled and disassembled. The blade is selectively attachable to the cutting arm assembly, allowing for easy replacement and maintenance while maintaining portability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutting arm assembly is designed to be rotatably attached to the frame assembly, enabling dynamic adjustment of the cutting blade position for various cutting angles. This rotational capability provides versatility while keeping the overall structure compact and portable.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If existing cutting apparatuses are used, then cutting function is provided, but cutting performance deteriorates

Engineering Contradiction:

Improvecutting qualityVSAvoidapparatus structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The alignment mechanism is integrated into the frame assembly and cutting arm assembly, combining alignment functionality with the structural components. This integration ensures precise alignment of the cutting blade with the support surface without adding separate complex alignment devices.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The alignment mechanism utilizes biasing members that employ elastic mechanical principles to maintain consistent alignment pressure between the cutting blade and support surface. This mechanical substitution provides reliable alignment without requiring complex electronic or hydraulic systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If utility knives are used, then portability is achieved, but cutting performance for shearing deteriorates

Engineering Contradiction:

ImproveportabilityVSAvoidshearing performance

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The apparatus transitions from the one-dimensional linear cutting action of a utility knife to a two-dimensional rotational cutting motion. The rotatable cutting arm assembly enables angular cuts and provides a larger cutting blade surface area, enhancing shearing performance while maintaining portability through compact folding design.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS9199385B2Cutting apparatus

Publication Date: 2015.12.01 AJC TOOLS & EQUIP

AI summary

A cutting apparatus comprises a frame assembly which includes a support surface and a first cutting blade. The cutting apparatus also comprises a cutting arm assembly which is rotatably attached to the frame assembly and includes a second cutting blade. The cutting apparatus also comprises an alignment mechanism secured to the frame assembly and the cutting arm assembly.