Shears With Polygonal Pin Holes For Debris Flushing
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Solution Overview
Problem
Conventional shears require excessive force for operation due to buildup of sap gum, foreign matter, or viscous substances in the pin section, leading to inconsistencies in handling and potential damage during cleaning attempts.
Innovation Solution
The shears feature grooves on the blade pieces leading from the pin holes, with at least one pin hole being polygonally bored, and a columnar pin shank with cap portions that form channels for flushing out debris without removing the pin section, allowing for easy cleaning with washing fluid or air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the pin section is made removable to facilitate cleaning, then cleaning ease is improved, but handling consistency deteriorates due to loss of delicate power balance
Solution Approach 1:
The pin section is segmented into a pin body and a separate cleaning tool that can insert into the pin hole. This allows cleaning access without removing the entire pin, maintaining the delicate power balance while enabling effective cleaning of sap gum and foreign matter from the pin section.
Solution Approach 2:
A cleaning tool serves as an intermediary element that accesses the pin hole internally. The tool can be inserted through the pin hole to clean the pin section from the inside, eliminating the need to remove the pin while still achieving thorough cleaning of accumulated substances.
2Ease of manufacture
If the pin hole is made columnar for simple manufacturing, then manufacturing ease is improved, but cleaning effectiveness deteriorates due to inability to access internal buildup
Solution Approach 1:
The cleaning function is segmented from the pin structure itself. Instead of making the pin hole non-cylindrical to enable cleaning, a separate cleaning tool is used that can access the cylindrical pin hole and perform the cleaning function, thus maintaining manufacturing simplicity while achieving cleaning effectiveness.
Solution Approach 2:
The cleaning tool acts as an intermediary that bridges the gap between the simple cylindrical pin hole design and the need for effective cleaning. The tool can be inserted into the cylindrical hole to remove sap gum and foreign matter without requiring the hole itself to have a complex shape.
3Ease of repair
If excessive force is applied to remove buildup from pin section, then cleaning thoroughness is improved, but device damage risk increases
Solution Approach 1:
The cleaning tool serves as a mediator that performs the cleaning action internally through the pin hole. This allows thorough cleaning of sap gum and foreign matter from the pin section using controlled, internal forces rather than external force application that could damage the blades or pin.
Solution Approach 2:
The cleaning mechanism replaces brute force mechanical removal with a more refined internal cleaning action. The cleaning tool can use rotational or scraping motions within the pin hole to remove buildup without applying excessive external force that might damage the shear components.
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
This configuration enables reliable cleaning of resinous gum, foreign matter, and viscous substances without altering the feel during handling, providing a light and jiggle-free operational experience by minimizing surface contact and preventing pin shank knocking.
Implementation Method 1
the grooves (10), the gap made between the polygonally bored pin hole(s) and the pin shank, and the opening (22a) to form channels, making it possible to flush out resinous gum, foreign matter, highly viscous grease, sticky substances, etc. built up in the pin holes (4 and 8)
Implementation Method 2
the pin shank has a columnar form with a diameter whereby in a rotatable state the shank interiorly contacts the sides of the polygonally bored pin hole(s)
Data Source
AI summary
Shears configured with blade pieces having pin holes, at least one of which is polygonal, along basal ends of the blade pieces, and a pin-hole swivel pin, and provided with grooves on either of opposing inner-side faces of the blade pieces. When the shears are in a predetermined open/close state, the grooves lead from the pin holes to the blade pieces' exterior. The pin is constituted by a columnar pin shank ending in cap portions. Rotatable, the pin shank interiorly contacts the polygonal pin hole's sides. The cap portion along the at least one blade piece having the polygonal pin hole has an opening interconnecting a gap between the pin hole and the pin shank with the cap portion's outer side. The grooves, the pin-hole/pin-shank gap, and the opening secure washing-fluid or air channels for cleaning out the pin holes, and realize a light, jiggle-free operational feel.