Saw Sheath Guide Rollers and Elastic Retention

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Solution Overview

Problem

Conventional saw sheaths face issues with easy insertion, secure retention, and durability, as they often result in the saw blade falling out, misalignment, and damage to the sheath due to inadequate guiding mechanisms and poor elastic fitting.

Innovation Solution

A saw sheath design featuring a wide entrance with guide rollers on both sides, grip penetration preventing sections with elastic fitting spaces, and additional guide rollers inside to ensure proper blade orientation and secure insertion, preventing the saw from falling out and reducing damage to the sheath.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the sheath opening is made wide to facilitate insertion of the saw body, then the ease of operation is improved, but the saw body becomes easy to fall out inadvertently

Engineering Contradiction:

Improveease of insertionVSAvoidretention of saw body

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The sheath opening is divided into two functional zones: a wide upper opening for easy insertion and a narrower lower opening for secure retention. This segmentation allows the sheath to provide both easy access and reliable holding without compromise.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of making the entire opening narrow to prevent falling out, the invention inverts the approach by making the insertion portion wide and the retention portion narrow, reversing the conventional uniform opening design.

Inventive Principle:

Principle #13The other way round (Inversion)

2Device complexity

If rigid roller members are placed merely roughly near the opening to guide the saw body, then the device complexity is reduced, but the manufacturing precision of blade tip orientation is insufficient

Engineering Contradiction:

Improvesimplicity of guide structureVSAvoidorientation precision of blade tip

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The guide rollers are arranged in multiple dimensions: first rollers guide from the side, second rollers guide from above, and third rollers guide from below. This multi-dimensional arrangement achieves precise orientation without overly complicating the structure.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The guide rollers are positioned to perform preliminary guiding actions at different stages of insertion, progressively correcting the blade tip orientation before the blade enters the main sheath body, ensuring proper alignment is achieved in advance.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If the sheath uses a simple elastic fitting structure without rollers, then the device complexity is reduced, but the durability is poor and the sheath is easily scraped off by the saw blade

Engineering Contradiction:

Improvesimplicity of structureVSAvoiddurability of sheath

Core Design Contradiction:

Device complexityVSDuration of action of stationary object

Solution Approach 1:

Guide rollers are introduced as intermediary elements between the saw blade and the sheath inner wall. These rollers bear the contact and guiding functions, preventing the saw blade from directly scraping the sheath inner wall, thus extending the sheath's service life.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention replaces the direct mechanical contact between the saw blade and sheath inner wall with a rolling contact system. This substitution reduces friction and wear, significantly improving durability while maintaining structural simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The design allows for easy and secure insertion of the saw blade, preventing rattling and damage to the sheath, ensuring smooth operation and extended durability by maintaining the saw's position within the sheath.

Implementation Method 1

a pair of guide rollers for guiding the blade tip into the sheath opening section are provided at the entrance of the sheath opening section

Methodology Applied

Scientific EffectRolling contact: Roller

Implementation Method 2

the certain spacing between the grip penetration preventing section and the corresponding guide roller constitutes an elastic grip-fitting space for receiving and elastically fitting a part of the saw grip therein

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS9050730B2Saw sheath

Publication Date: 2015.06.09 UM INDS

AI summary

A saw sheath is provided which allows a saw to be inserted easily and smoothly, which prevents the inserted saw from easily falling out or rattling in the sheath, and which can suppress scraping-off of the inner wall by the blade tip of the saw blade caught by the inner wall. The saw sheath (1) includes a flat sheath opening section (10) and a flat main sheath body (20), and a saw blade (31) is inserted into the main sheath body (20) via the sheath opening section (10). The sheath opening section (10) has an opening width that is wider at the entrance and becomes narrower with depth. A pair of guide rollers (11a) are provided at the entrance of the sheath opening section (10), on the respective sides in the width direction of the entrance, and a pair of grip penetration preventing sections (15) are provided behind the pair of guide rollers (11a). Certain spacing between the grip penetration preventing section (15) and the corresponding guide roller (11a) constitutes an elastic grip-fitting space (16).