Quick-Release Blade Carrier Assembly to Prevent Thread Tool-Lock
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Solution Overview
Problem
Cutting device blades, such as those in lawnmowers, require frequent maintenance like sharpening and replacement, and existing attachment methods with threaded fasteners often lead to wear and tear, tool-lock conditions, and costly replacements due to the high torque needed for attachment and detachment.
Innovation Solution
A quick release cutting device blade assembly featuring a blade carrier assembly with a female threaded portion and conical-shaped washers that resist tool-lock conditions by allowing engagement and disengagement without excessive torque, and include an engagement pin for rotational orientation and impact absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded fastener is used to attach the cutting device blade to the output shaft, then the blade attachment is secure and reliable, but significant torque must be applied which causes wear and tear and tool-lock conditions
Solution Approach 1:
The attachment system is segmented into multiple functional components: a blade carrier assembly with a female threaded portion, conical washers for impact absorption, and an engagement pin for rotational orientation. This segmentation allows each component to perform its specific function optimally while distributing the mechanical stresses, preventing tool-lock conditions in the threaded portion.
Solution Approach 2:
Conical-shaped washers are positioned between the blade carrier assembly and the output shaft to absorb impact forces before they reach the threaded connection. This beforehand cushioning prevents excessive torque from being transmitted to the threads, eliminating the risk of tool-lock conditions while maintaining secure attachment during normal operation.
2Strength
If significant torque is applied to the threaded fastener to affix the blade, then the attachment is secure, but wear and tear increases leading to costly replacements
Solution Approach 1:
The conical washers serve as protective elements that absorb impact loads and distribute forces away from the threaded connection. By cushioning against shocks and vibrations during operation, they prevent wear and tear on the threads and fastener components, extending the service life of the entire attachment system.
Solution Approach 2:
The engagement pin acts as an intermediary mechanical element that provides positive rotational orientation and location between the blade carrier assembly and the output shaft. This intermediary component ensures proper alignment and distributes rotational forces, reducing wear on the threaded connection while maintaining secure attachment.
3Reliability
If a threaded fastener system is used, then the blade can be securely attached, but the maintenance and replacement process is time-consuming
Solution Approach 1:
The blade carrier assembly is designed as a pre-assembled unit with the female threaded portion, conical washers, and engagement pin already in place. This segmentation allows the entire carrier assembly to be removed and replaced as a single unit, significantly reducing maintenance time while maintaining secure attachment during operation.
Solution Approach 2:
The blade carrier assembly is pre-configured with all necessary components (threaded portion, washers, engagement pin) before installation. This preliminary preparation eliminates the need for on-site assembly adjustments during maintenance, allowing for quick removal and replacement of the entire assembly without time-consuming disassembly or realignment procedures.
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 easy and secure attachment and detachment of cutting device blades, reducing wear and tear, preventing tool-lock conditions, and minimizing replacement costs by using a thread pattern that resists tool-lock conditions and absorbing impact forces.
Implementation Method 1
conical-shaped washer configured for seating against the blade carrier assembly and transmitting a force to the blade carrier assembly
Implementation Method 2
The female threaded portion includes a thread pattern configured for resisting a tool-lock condition when a force transmitted through teeth of the thread pattern is maintained below a maximum operational force
Data Source
AI summary
An apparatus for a quick release cutting device blade assembly is provided. The apparatus includes a blade carrier assembly. The blade carrier assembly includes an adaptor and a backing plate configured to fit over the central post and including a second flat surface. The adaptor includes a flat end plate including a first flat surface, a central post, and a female threaded portion configured to be engaged to a male threaded portion of an output shaft of a cutting device. The blade carrier assembly is configured to affix a cutting device blade between the first flat surface and the second flat surface. The female threaded portion includes a thread pattern configured for resisting a tool-lock condition when a force transmitted through teeth of the thread pattern is maintained below a maximum operational force.