Knife Sheath Locking Cam for One-Handed Speed Draw
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Solution Overview
Problem
Existing knife sheath systems require awkward and multiple hand movements for drawing and releasing knives, leading to inefficient and unsafe knife deployment due to unnatural hand and arm movements, and often necessitate the use of both hands for lock mechanisms.
Innovation Solution
A knife retention and speed draw system featuring a longitudinally elongated sheath body with a locking cam and a spring-loaded release mechanism that allows for one-handed operation, enabling quick and natural draw of the knife by rotating the locking cam with a finger, facilitating secure retention and immediate deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lock mechanisms are used to secure knives to sheaths, then retention and security are improved, but the complexity of operation increases and draw speed decreases
Solution Approach 1:
The locking mechanism is segmented into separate functional components: a locking cam that engages with a locking surface on the knife handle, and a release mechanism with a button that actuates the cam. This segmentation allows the lock to be simple and secure during retention, while the release is easily operable with a single finger movement, resolving the contradiction between security and ease of operation.
Solution Approach 2:
Instead of requiring complex multi-step release procedures, the mechanism is designed so that a simple pressing motion on the release button inverts the locking action, causing the locking cam to disengage from the locking surface. This inversion enables quick one-handed release without complicated hand movements, improving ease of operation while maintaining secure retention during normal use.
2Reliability
If upward vertical draw movements are required to retrieve knives from sheaths, then secure retention is achieved, but natural hand movement is compromised and draw time increases
Solution Approach 1:
The knife is positioned in the sheath with the blade pointing downward and the handle accessible for natural hand closure. The release mechanism is pre-configured so that when the hand naturally closes around the handle, the finger can simultaneously actuate the release button. This preliminary positioning eliminates the need for awkward upward pull movements, enabling quick natural draw while maintaining secure retention during normal use.
Solution Approach 2:
The mechanism transitions from a static locked position to a dynamic release state through a simple button actuation that allows the knife to be drawn with natural hand movements. The locking cam and locking surface are designed to engage securely during retention, then easily disengage when the release button is pressed, enabling the hand to naturally close around and draw the knife without unnatural upward pulling motions, thus improving draw speed while maintaining retention security.
3Reliability
If multiple hand movements are required to release lock mechanisms, then secure retention is maintained, but operational efficiency decreases and safety is reduced
Solution Approach 1:
The release function is extracted from complex multi-step procedures and condensed into a single button actuation. The release button directly actuates the locking cam to disengage from the locking surface, eliminating the need for multiple hand movements or coordination between hands. This extraction of the release function into a simple, immediate action improves operational efficiency and safety while maintaining secure retention during normal use.
Solution Approach 2:
The mechanism is designed to be self-servicing through a single finger pressure on the release button, which automatically actuates the locking cam and releases the knife from the sheath. This self-service design eliminates the need for complex manual manipulation or two-handed operation, significantly improving draw efficiency and safety response time while maintaining secure retention during normal carry conditions.
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 fast and efficient one-handed knife deployment through natural hand movements, enhancing safety and speed by allowing quick release and deployment without altering the hand grip, reducing the need for additional hand or arm movements.
Implementation Method 1
a spring pad (14) to rotate the locking cam (11)
Data Source
AI summary
A knife retention system includes an longitudinally elongated sheath body configured for holding a blade of a knife along an edge of the blade, a locking cam attached to the sheath body through an attachment, and a spring pad pre-biased to supply a force to rotate the locking cam. The locking cam is configured to rotate about the attachment; the locking cam includes a switch and an insert, and the insert is configured to be inserted into a handle of the knife when the blade is held by the sheath body. The force is configured to keep the insert inserted into the handle. The switch is configured to receive a counter-force countering the force to rotate the locking cam to release the insert from the handle.