Sealed Wedge Lock for Plastic Disposable Handcuffs Against Strap Release
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Solution Overview
Problem
Existing plastic disposable handcuffs with flexible ratchet mechanisms are vulnerable to deformation and release by opposing force, and external manipulation of wedge locks is not secure.
Innovation Solution
A lock design featuring a wedge-shaped ratchet mechanism within a sealed chamber, where the wedge is embedded and protected by a seal, increasing frictional resistance against opposing forces and external tampering, with a spring mechanism to maintain proper engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible ratchet mechanism is used in the base, then the handcuffs can be quickly applied and locked by pulling the strap, but the ratchet mechanism can be deformed by force and the strap can be ripped from the lock
Solution Approach 1:
The ratchet mechanism is divided into separate components: a wedge-shaped ratchet body and a stationary toothed surface on the strap. This segmentation allows the ratchet body to be securely embedded in the base while the toothed surface remains on the strap, distributing mechanical stress and preventing deformation of the entire mechanism.
Solution Approach 2:
The wedge-shaped ratchet body is nested within a receiving cavity in the base, with a seal embedding it laterally. This nested structure protects the ratchet mechanism from external forces while allowing it to function internally, preventing the strap from being ripped away from the lock.
2Reliability
If a wedge locking mechanism is used with the wedge accessible from outside, then the handcuffs provide resistance to loosening, but the wedge can be manipulated from the outside to release the handcuffs
Solution Approach 1:
The wedge-shaped ratchet body is nested within a receiving cavity in the base, with a seal embedding it laterally. This nested structure hides the wedge mechanism from external access while maintaining its locking function, preventing manipulation from the outside.
Solution Approach 2:
The seal acts as an intermediary element between the external environment and the wedge-shaped ratchet body. It laterally embeds the ratchet body in the base, providing a barrier that prevents direct external manipulation while allowing the mechanism to function.
3Object-affected harmful factors
If the wedge is embedded and protected by a seal, then external manipulation is prevented, but the manufacturing complexity increases
Solution Approach 1:
The wedge-shaped ratchet body is nested within a receiving cavity in the base, with a seal embedding it laterally. This nested structure, while adding components, creates a modular design where each element (cavity, seal, ratchet body) can be manufactured separately and assembled, potentially simplifying production despite the increased number of parts.
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 lock provides enhanced security against release by opposing force and external manipulation, ensuring the handcuffs can only be removed by cutting, while maintaining ease of application and manufacturing simplicity.
Implementation Method 1
A lock design featuring a wedge-shaped ratchet mechanism within a sealed chamber, where the wedge is embedded and protected by a seal, increasing frictional resistance against opposing forces
Implementation Method 2
with a spring mechanism to maintain proper engagement
Implementation Method 3
the wedge is embedded and protected by a seal
Data Source
Figure 1
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Figure 3
AI summary
The lock for plastic disposable handcuffs (1) comprises a base (2) provided with a hole (3) for pulling a toothed strap (4) through the base (2) and further provided with a ratchet mechanism for one-way locking of the toothed strap (4). Inside the base (2) of the lock there is a chamber (5) having the shape of a wedge, the ratchet mechanism being formed by a toothed wedge (6) embedded in the chamber (5). The wedge (6) is protected in the chamber (5) by a seal (12). The wedge (6) allows the toothed strap (4) to be pulled through the base in one direction only. In the case of opposite pull, the wedge (6) engages the sides of the chamber (5), thereby increasing many times the force required to pull the toothed strap (4) through the base (2) in the opposite direction. The plastic disposable handcuffs (1) combine two locks with wedges (6) in the common body of bases (2) and two toothed straps (4) connected to the common body of bases (2).