Safety Harness Strap Adjuster With Ratchet Locking Mechanism
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Solution Overview
Problem
Existing safety harnesses face issues with strap looseness due to inadequate buckling mechanisms, which compromise the fit and safety of the harness during falls, and can be uncomfortable and cumbersome.
Innovation Solution
A safety harness strap adjuster featuring a base, a rotatably connected shaft with a tapered slot, and a locking mechanism that allows rotation in one direction while preventing it in the opposite direction, along with a ratchet mechanism and pawl system to securely wind and unwind the strap, ensuring a secure fit without accidental ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional buckles are used to interconnect straps, then the harness can be assembled, but the straps may loosen and compromise the proper fit
Solution Approach 1:
The adjuster mechanism transforms the static buckle connection into a dynamic adjustment system. The shaft can rotate to wind the strap around it, allowing the user to dynamically adjust the strap length and tension. The locking mechanism then freezes this dynamic adjustment in place, ensuring the strap maintains its proper fit without loosening during use.
Solution Approach 2:
The adjuster mechanism enables the strap system to self-regulate its own fit. By allowing the user to easily rotate the shaft and wind the strap, the system provides self-adjustment capability without requiring external tools or complex procedures. The locking mechanism then maintains this self-adjusted state automatically.
2Ease of operation
If the shaft allows free rotation for adjustment, then the strap can be easily adjusted, but the strap may accidentally unwind and loosen
Solution Approach 1:
The locking mechanism is designed to prevent the harmful action of accidental unwinding before it can occur. The pawl and ratchet teeth are positioned to engage automatically when the shaft rotates in the unwinding direction, creating a preliminary barrier against the harmful effect of strap loosening while allowing easy adjustment in the winding direction.
3Ease of operation
If the slot is straight rather than tapered, then the strap can pass through easily, but the strap end may be accidentally ejected
Solution Approach 1:
The slot is designed with an asymmetric tapered geometry rather than a symmetric straight shape. The tapered portion allows easy insertion of the strap end, while the narrower portion acts as a retention barrier. This asymmetric design provides directional functionality: easy entry in one direction but prevention of ejection in the opposite direction.
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 adjuster effectively maintains the strap's tension, preventing looseness and ensuring a secure fit, thereby enhancing safety and comfort by allowing easy adjustment and preventing accidental unwinding, thus minimizing strain on the user's body during falls.
Implementation Method 1
a ratchet mechanism interconnecting the base and the shaft, the ratchet mechanism allowing rotation of the shaft in a first direction and preventing rotation of the shaft in a second opposite direction
Data Source
AI summary
An adjuster adjusts a length of at least one strap of a safety harness. The at least one strap is selected from the group consisting of at least one shoulder strap, at least one chest strap, at least one waist strap, at least one seat strap, and at least one leg strap. The adjuster comprises a base, a shaft rotatably operatively connected to the shaft and defining a slot configured and arranged to receive the at least one strap, and a locking mechanism interconnecting the base and the shaft. The locking mechanism allows rotation of the shaft in a first direction and prevents rotation of the shaft in a second opposite direction. A method of adjusting a length of at least one safety harness strap with an adjuster comprises positioning the adjuster at a desired location along the at least one strap, winding the at least one strap about the shaft, and locking the shaft with the locking mechanism to prevent rotation in an unwinding direction.