Double Lock Handcuff Bolt Spring Mechanism
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Solution Overview
Problem
Conventional handcuffs with double lock assemblies lack sufficient security and structural integrity, as the bolt can be lifted against spring bias without a key, compromising the locking mechanism.
Innovation Solution
The design incorporates a bolt with teeth and a bolt spring that engages with a frame and cheek head, featuring a stud and groove system, along with a key pin mechanism that allows for dual locking and unlocking, providing enhanced security and structural support through a bolt spring that biases the bolt into locking engagement with the jaw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional double lock assembly is used with a bolt and spring, then the handcuff can be locked and unlocked, but the bolt can be lifted against spring bias without a key, compromising security
Solution Approach 1:
A key pin is introduced as an intermediary element that mediates between the key and the bolt spring mechanism. The key pin engages with a recess in the bolt spring and transfers rotational motion to linear motion, enabling controlled lifting of the bolt only when the correct key is inserted. This mediator prevents direct lifting of the bolt against spring bias while maintaining secure locking when engaged.
Solution Approach 2:
The bolt spring is designed with dynamic characteristics, including a recess that receives the key pin and allows controlled displacement. The spring can be compressed and released through the key pin mechanism, enabling the bolt to move between locked and unlocked positions. This dynamic design allows the spring to provide continuous bias force while permitting controlled motion through the key-operated mechanism.
2Reliability
If additional locking components are added to prevent bolt lifting, then security is improved, but the number of parts increases
Solution Approach 1:
The key pin serves multiple functions simultaneously: it acts as a mechanical stop to prevent unauthorized lifting of the bolt, a transmission element that converts rotational key motion to linear spring compression, and a positioning element that aligns the bolt with the jaw teeth during locking. This multi-functionality reduces the need for separate components for each function, thereby limiting the increase in part count while improving security.
Solution Approach 2:
The key pin mechanism merges the functions of the key, the bolt spring, and the locking mechanism into an integrated assembly. The key pin is combined with the bolt spring recess and the jaw structure, creating a unified system where multiple functions are achieved through a single component rather than separate elements. This merging approach improves security without proportionally increasing device complexity.
3Strength
If the bolt spring is made more rigid to prevent lifting, then locking strength is improved, but the ease of unlocking with a key is reduced
Solution Approach 1:
The bolt spring is designed with dynamic characteristics that allow it to provide strong bias force during locking while enabling easy unlocking when the key is inserted. The spring can be compressed significantly when the key pin is engaged, storing energy that facilitates smooth bolt movement during unlocking. This dynamic design maintains strength during the locked state while enabling efficient operation during unlocking.
Solution Approach 2:
The key pin performs preliminary action by engaging with the bolt spring recess before the bolt can be lifted or unlocked. This preliminary engagement prepares the spring for controlled compression and positions the bolt for smooth movement. By performing this preliminary action, the system ensures that the bolt can be unlocked efficiently while maintaining strong locking force during the normal locked state.
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 achieves a secure double locking mechanism that prevents the bolt from being lifted without a key, ensuring the handcuff remains locked, while allowing for efficient unlocking with minimal parts and increased structural integrity.
Implementation Method 1
A spring biased bolt is also conventionally carried by the cheek. The bolt carries teeth which engage in ratchet-like-manner with teeth carried by the jaw upon closing the jaw into the cheek to close the handcuff.
Implementation Method 2
The bolt carries teeth which engage in ratchet-like-manner with teeth carried by the jaw upon closing the jaw into the cheek to close the handcuff. The meshing teeth prevent relative movement of the cheek and jaw away from one another
Data Source
AI summary
A handcuff comprising a bolt and a bolt spring which work in combination to double lock the handcuff. The bolt comprises an underside having teeth which are engagable with the teeth of a jaw. The underside of the bolt further comprises a groove through which a stud disposed on a cheek head of the handcuff is positioned to thereby further secure the bolt in position when the handcuff is locked. The bolt further comprises an upper side comprising a groove, a ridge, and a detent. The bolt spring comprises a body bent to form a side wall which bridges a first spring leg portion to a second spring leg portion, wherein the first and second spring leg portions engage with the upper side of the bolt to hold the bolt spring in a first position.