Tamper-Evident Bolt Seal With Bonded Housing Cover
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Solution Overview
Problem
Current tamper-evident bolt security seals often lack effective mechanisms to prevent tampering, allowing unauthorized access and subsequent resealing without leaving evidence, making it difficult to identify the perpetrator of theft during transit.
Innovation Solution
A tamper-evident bolt security seal design featuring a locking unit with a transparent cover, laser-imprinted indicia, and a resilient split ring mechanism, where the cover is bonded to prevent removal without destruction, and the lock body is constructed from different materials to enhance security and visibility of tampering attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lock body with a resilient split ring is used, then the seal provides basic locking function, but it lacks effective tamper evidence capability allowing unauthorized access without leaving visible evidence
Solution Approach 1:
The lock body is divided into two distinct housing portions (first housing portion and second housing portion) that are bonded together. This segmentation allows the tamper evidence mechanism to be distributed across multiple components, where the bond between portions serves as the tamper evidence element, while each portion can be independently manufactured and assembled.
Solution Approach 2:
A bond (adhesive or weld) is introduced as an intermediary element connecting the first and second housing portions. This bond serves dual functions: structurally joining the housing portions and providing tamper evidence capability. Any attempt to separate the housing portions to access the locking mechanism destroys this bond, leaving visible evidence of tampering.
2Reliability
If the lock body is made transparent with visible indicia, then tamper evidence visibility is improved, but the structural strength and security are reduced
Solution Approach 1:
The housing portions are designed with differentiated properties: the outer surfaces are made transparent or translucent to allow visibility of tamper evidence indicia, while the bonding interfaces and internal structural elements maintain high strength characteristics. The bond between housing portions is positioned to provide both structural support and tamper evidence function without compromising overall housing strength.
Solution Approach 2:
The housing portions utilize composite construction combining transparent or translucent material for visibility with strong bonding materials (adhesive or weld) for structural integrity. The bond itself acts as a composite element joining the housing portions, providing both mechanical strength and tamper evidence capability through its visible destruction upon tampering.
3Reliability
If the resilient split ring mechanism is used for locking, then the locking function is reliable, but unauthorized removal attempts can be made without leaving evidence
Solution Approach 1:
The bond between the first and second housing portions is positioned to preemptively prevent unauthorized access to the resilient split ring mechanism. Any attempt to remove or manipulate the bolt and ring is blocked by this bond, which must be destroyed first. This preliminary barrier provides tamper evidence before the actual locking mechanism can be compromised.
Solution Approach 2:
The housing portions are pre-bonded together during manufacturing to create a sealed enclosure around the locking mechanism. This preliminary action of bonding prevents subsequent unauthorized access attempts, as any disassembly requires destroying the bond, which leaves visible evidence of tampering before the locking function itself can be compromised.
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 design provides clear evidence of tampering attempts, preventing unauthorized access and ensuring that any attempt to open the seal results in visible damage, thereby deterring theft and facilitating the identification of responsible individuals.
Implementation Method 1
A resilient split ring is located in the lock body channel. The ring has an inner diameter that is smaller than the outside diameter of the bolt shank... As the shank is inserted into the lock body bore, the ring expands into the channel's larger diameter portion. When the shank groove aligns with the channel, the ring automatically retracts toward its quiescent position engaged with the bolt groove.
Data Source
AI summary
A tamper evident security seal includes a locking unit (109 and a bolt with a groove at its shank locking portion, the groove for receiving a resilient locking ring attached to a lock body in a locking unit receiving the bolt in a locked state. The locking unit includes two housing portions (12,14) one of which has a top wall (18), a bottom wall (16)and a first upstanding segment of a circular cylinder side wall (20) interconnected thereto may be of any color. The top wall (18) has an aperture (28) for receiving the bolt therethrough. A mating second housing portion has a second segment of a circular cylinder side wall (32), preferably white having ID indicia thereon, forms a circular cylindrical housing with the first housing portion and is captured between the top and bottom walls. A lock body first element is plastic and molded one piece with the second housing portion. A lock body second steel element mates with the first element forming a lock body with an annular channel in which the ring is positioned. The channel and ring generally form a conventional bolt locking arrangement. A plastic transparent cover, enclosing the two housing portions (12.14), is bonded to the bottom wall (16). A collar on the top wall has two slots for receiving mating anti-spin tabs on the bolt shank.