Door Security Device Hinge Pin Blocking Mechanism
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Solution Overview
Problem
Conventional security devices for restricting door or window openings are vulnerable to disassembly due to the ease of manipulating the hinge pin, allowing unauthorized removal of the arm from the base member.
Innovation Solution
Incorporating a first blocking element that blocks access to the hinge pin from the opposite direction of insertion, and optionally a second blocking element to lock the hinge pin from both sides, making it difficult to extract the pin and increasing security by using plugs or fasteners with specific mounting channels and coupling elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the hinge pin is retained in the bore by a press fit or force fit, then the assembly of the door guard is relatively easy, but the door guard becomes vulnerable to disassembly or demounting
Solution Approach 1:
The patent applies preliminary action by providing blocking elements that are pre-installed in the base member to prevent future unauthorized access. The blocking elements are positioned before any potential tampering attempt, proactively securing the hinge pin against extraction or manipulation, thus resolving the contradiction between easy assembly and security against disassembly.
Solution Approach 2:
The blocking elements serve as intermediary components between the hinge pin and the external environment. These elements mediate the interaction by physically obstructing access to the hinge pin, allowing the press fit to remain simple while adding a security layer that prevents unauthorized disassembly.
2Ease of operation
If the hinge pin is made accessible for easy insertion, then the assembly is simplified, but the hinge pin becomes accessible for manipulation and extraction
Solution Approach 1:
The patent applies asymmetry by designing the blocking elements to allow insertion from one direction while preventing extraction or manipulation from other directions. The blocking elements create an asymmetric access pattern where the hinge pin can be inserted easily but cannot be removed or tampered with, thus resolving the contradiction between ease of operation and protection against harmful factors.
Solution Approach 2:
The blocking elements implement preliminary anti-action by pre-positioning obstacles that counteract potential tampering attempts. Before any harmful manipulation can occur, the blocking elements are already in place to prevent access to the hinge pin, thus neutralizing the tampering risk while maintaining easy insertion capability.
3Reliability
If the blocking element is integral to the base member, then the security is increased, but the disassembly and demounting becomes difficult
Solution Approach 1:
The patent applies segmentation by separating the blocking element from the base member, making them distinct, removable components. This allows the blocking element to provide security when installed, while enabling easy removal and disassembly when needed, thus resolving the contradiction between security and ease of repair.
Solution Approach 2:
The blocking element transitions from a static, fixed state (providing security) to a dynamic, removable state (allowing disassembly). This dynamic characteristic enables the system to switch between security mode and maintenance mode, resolving the contradiction between high security and ease of repair.
Data Source
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AI summary
The invention relates to a security device for restricting the opening of a door or a window, wherein the security device comprises a base member, an attachment and an arm, wherein the security device is provided with a hinge pin for hingably coupling the arm to the base member about the axis of rotation, wherein both the base member and the arm are provided with bores for receiving the hinge pin in a direction of insertion, wherein the security device is provided with a first blocking element that, at least after receiving of the hinge pin in the bore of the base member, is arranged for blocking access to the hinge pin in a direction opposite to the direction of insertion, wherein the base member is provided with a first mounting channel intersecting with the bore and arranged for receiving the first blocking element.