Roofing Trolley Knife Mount for Standing Shingle Cutting

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Solution Overview

Problem

Existing roofing tools are slower, less convenient, harder on the body, less accurate, and require bending over or crouching during roof tear-off and shingle cutting, limiting efficiency and safety.

Innovation Solution

A roofing trolley with a carriage body, wheels, a knife mount, and a handle that allows for a hooked knife to be slidably coupled to a bracket, enabling the user to walk backwards while cutting, and featuring adjustable and rotatable components for precise control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional roofing knives are used for cutting shingles, then cutting can be performed, but the user must bend over or crouch which causes physical strain and reduces efficiency

Engineering Contradiction:

Improveuser comfortVSAvoidwork efficiency

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent introduces a wheeled carriage system that transitions the cutting operation from a stationary hand-held knife to a mobile platform. The user walks backwards behind the carriage, utilizing the third dimension (vertical movement through walking) to eliminate bending and crouching, thereby improving comfort while maintaining cutting efficiency

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If extra-long handles are used on roofing knives to keep knuckles clear, then safety is improved, but control precision and cutting accuracy deteriorate

Engineering Contradiction:

ImprovesafetyVSAvoidcutting accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent separates the cutting function from the handling function. The knife blade remains compact for precise control, while the carriage handle provides the extended reach for safety. The knife is mounted on the carriage rather than being held directly, allowing the blade to stay close to the workpiece for accuracy while the user maintains a safe distance through the extended carriage handle

Inventive Principle:

Principle #1Segmentation

3Productivity

If manual shingle cutting is performed while standing, then productivity increases, but cutting precision and control decrease

Engineering Contradiction:

Improvework speedVSAvoidcut precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent introduces the wheeled carriage as an intermediary between the user and the cutting operation. The carriage carries the knife mount and provides a stable platform that moves with the user. This intermediary allows the user to maintain walking speed for productivity while the carriage ensures steady, controlled cutting motion for precision

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260049476A1Roofing trolley

Publication Date: 2026.02.19 STOUT JOHN FISK

AI summary

A roofing trolley. There is a carriage body, including: a first pair of wheels spaced apart from each other, and positioned and sized to support the carriage body; and an axle disposed interior to the first pair of wheels; a knife mount coupled to the axle, and including a bracket protruding therefrom, wherein the knife mount is selectably rotatable; a hooked knife slidably coupled to the bracket of the knife mount; and a handle extending from the carriage body.