Sliding Door Security Device with Interfering Stop Members
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Solution Overview
Problem
Existing security devices for sliding doors and windows lack effective mechanisms to prevent unauthorized opening while allowing unrestricted movement in an unlocked state, and often fail to securely retain the barricade member, leading to potential loss or theft.
Innovation Solution
A security device comprising a base plate with a T-shaped slot and a barricade member, along with stop members that interfere with each other to restrict the barricade member's removal, allowing for a secure locked state and easy transition to an unlocked state, while preventing complete disengagement to prevent loss or theft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the barricade member is made removable from the base plate, then ease of operation is improved, but reliability deteriorates due to potential loss or theft
Solution Approach 1:
The stop member is divided into two functional parts: a first portion attached to the barricade member and a second portion attached to the base plate. These segments work together to create the retention mechanism while maintaining the ability to remove the barricade member when needed.
Solution Approach 2:
The stop member acts as an intermediary element between the barricade member and the base plate. It mediates the interaction by providing a controlled retention mechanism that prevents complete removal while allowing operational movement.
2Reliability
If the barricade member is retained securely on the base plate, then reliability is improved, but ease of operation deteriorates due to difficulty in removal
Solution Approach 1:
The stop member provides localized retention at specific positions along the barricade member's path of movement. The first portion and second portion are positioned to interfere with each other only at the limits of movement, allowing free movement within the operational range.
Solution Approach 2:
The stop member configuration allows dynamic behavior: the first and second portions interfere with each other to prevent complete removal, but this interference can be overcome by applying sufficient force in the direction of movement, enabling removal when needed.
3Reliability
If stop members are added to prevent complete removal, then reliability is improved, but device complexity increases
Solution Approach 1:
The stop member combines multiple functions into a single component: it provides retention, defines the range of motion, and prevents complete removal. By merging these functions into one element rather than using separate mechanisms, the overall device complexity is minimized.
Solution Approach 2:
The stop member serves multiple purposes: it acts as a retention mechanism, a movement guide, and a prevention device against complete removal. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity.
Data Source
AI summary
A security device can be provided to selectively restrict or prevent the opening of a sliding door, sliding window, or other sliding panel or other closure. For example, the security device can include a base plate that selectively engages a barricade member (or lock rail). While the barricade member is engaged with the base plate (in a locked state), the barricade member and base plate cooperate to restrict or prevent the sliding door, window, panel or other closure from moving to an open position (or moving out of a closed position). The barricade member can be moved relative to the base plate (to an unlocked state) to allow unrestricted movement of the sliding door, window, panel or other closure. The security device can include stop members that may restrict or prevent complete removal of the barricade member from the base plate.