Knife Sheath Metal Strap Snap Connector Retention
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Solution Overview
Problem
Existing knife sheaths face challenges in securely retaining the knife during use and removal due to damage from the knife's sharp edge and the risk of inadvertent dislodgment, particularly with traditional joining methods like riveting and sewing, and the use of straps that can be damaged during insertion and removal.
Innovation Solution
A sheath design featuring thin layers of material with a resilient cut-resistant strap made of metal or polymer, secured by a snap connector that prevents accidental removal by folding around the pocket opening and resisting damage, with a woven covering to protect the knife and user from sharp edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rivets are used to join the edges of the sheath, then the sheath structure is strengthened, but the sharp edge of the knife is dulled
Solution Approach 1:
A fabric covering layer is introduced as an intermediary between the metal strap and the knife blade. This fabric layer acts as a mediator that prevents direct contact between the sharp knife edge and the metal strap, thereby eliminating the harmful effect of edge dulling while maintaining the structural strength provided by the metal strap and rivets.
2Ease of manufacture
If the sheath is sewn together, then the sheath is assembled, but the sewn edge is easily damaged by the sharp knife edge
Solution Approach 1:
The fabric covering layer is applied in advance to protect the sewn edges before the knife can cause damage. This preliminary protective measure cushions the vulnerable sewn areas, preventing the sharp knife edge from cutting or damaging the threads during insertion and removal operations.
3Reliability
If a strap is provided to prevent inadvertent loss of the knife, then knife retention is improved, but the strap can be damaged during insertion and removal
Solution Approach 1:
The fabric covering serves as a protective intermediary between the knife blade and the strap. During insertion and removal, the fabric layer absorbs the mechanical stress and prevents direct contact between the sharp blade and the strap material, thereby maintaining strap integrity while preserving the knife retention function.
4Ease of operation
If the strap is made resilient to spring out of the way during removal, then knife handling is eased, but the strap must be sufficiently flexible
Solution Approach 1:
The strap's physical parameters are modified by adding the fabric covering layer, which changes its surface characteristics and flexibility profile. The fabric layer allows the strap to maintain its resilient, spring-like behavior while providing additional flexibility and protection, enabling the strap to spring out of the way during knife removal without compromising structural integrity.
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 solution effectively prevents knife dislodgment and strap damage by using a resilient strap that springs out of the way during removal and resists cutting, ensuring secure retention and easy knife handling without compromising the strap's integrity.
Implementation Method 1
the resilient metal strap becomes relatively straight, parallel to the first and second sides when the first and second portions are released from one another thereby allowing removal of the knife without contact with the elongated resilient metal strap
Data Source
AI summary
A sheath having an elongated lower portion having first and second sides joined along opposing edges to form a pocket, a middle portion and a top portion comprising only the first side, an elongated resilient metal strap joined on a first end to the middle portion of the first side and a resilient snap connector, with a first portion of the resilient snap connector located proximate a second end of the resilient metal strap, the first portion releasably connects to a second portion of the resilient snap connector located on the middle portion of the second side thereby preventing removal from the knife from the pocket and wherein the elongated resilient metal strap becomes relatively straight, parallel to the first and second sides when the first and second portions are released from one another.