Chain Guard With Arcuate Locking Surfaces For Secure Attachment
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Solution Overview
Problem
Existing chain guards for chain saws are cumbersome to handle and store due to the need for multiple lengths to accommodate different cutting attachments, and they often fail to provide a secure fit, leading to issues with protection and stability.
Innovation Solution
A chain guard with detent recesses and arcuate locking surfaces on its side walls, allowing it to securely fit cutting attachments of different lengths by forming a form-fit locking mechanism that prevents unintentional removal, and featuring a threading bevel and centering depressions for easy installation and spatial fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate chain guard of adapted length is provided for each cutting set, then the protective effect and holding power are improved, but the device complexity and storage space requirements increase
Solution Approach 1:
The chain guard is designed with multiple detent recesses at different positions along its length, allowing a single guard to accommodate cutting sets of various lengths. The guard can latch onto different detent recesses depending on the cutting set length, making one component serve multiple functions that previously required separate components.
Solution Approach 2:
The chain guard incorporates multiple detent recesses segmented at different positions, each capable of engaging with the cutting set at different locations. This segmentation allows the single guard to adapt to different cutting set lengths without requiring multiple separate guards.
2Volume of stationary object
If a short chain guard is used as a basic unit with extension pieces, then the storage space is reduced, but the handling complexity and risk of jamming increase
Solution Approach 1:
The chain guard features multiple detent recesses that can engage with different positions on the cutting set, providing dynamic adaptability. This eliminates the need for static extension pieces while maintaining the ability to accommodate different cutting set lengths, thereby simplifying handling operations.
3Reliability
If the chain guard length is adjusted to match the cutting attachment length, then the protective effect is improved, but the adaptability to different cutting sets decreases
Solution Approach 1:
The chain guard incorporates multiple detent recesses at different positions along its length, allowing the effective engagement point to change depending on the cutting set length. This parameter variation enables the same guard to provide optimal protective effect for different cutting set lengths without requiring length adjustment.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The chain guard (3) has interchangeable cutting attachments (2) of different lengths are provided with cutting chains (13), where an insertion opening (4) is provided for inserting a cutting attachment. Two side walls (5) are provided for covering lateral surfaces (7), where latching depressions (11,12) are formed in one side wall. Each latching depression comprises arcuate latching surface for latching in a form-fitting manner with a cutting chain of the cutting attachment, so that the latching is active in the direction of a longitudinal axis of the chain guard. An independent claim is included for a chainsaw system.