Deadbolt Knob Restrictor Using Spring-Loaded Piston Latch
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Solution Overview
Problem
Existing deadbolt lock designs are limited in preventing unauthorized access when the key is lost or stolen, as previous solutions require modification of the door and are not adaptable to various lock designs.
Innovation Solution
A deadbolt lock knob restrictor with a ring member, L-shaped latch, and spring-loaded piston mechanism that fits between the decorative cover plate and the door, preventing manual rotation of the inside knob without modifying the door, and is compatible with different lock designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If previous devices are used to prevent rotation of the inside knob, then the knob rotation is prevented, but the door must be modified and the device is limited to specific deadbolt lock designs
Solution Approach 1:
The ring member is designed with a universal interface that fits between the decorative cover plate and door surface of various deadbolt lock designs. The adjustable positioning mechanism allows the same device to accommodate different knob positions and orientations, making it compatible with both right-handed and left-handed locks without requiring door modification.
Solution Approach 2:
The device incorporates an adjustable positioning mechanism that allows the latch to be positioned at different locations around the ring member's circumference. This dynamic adjustability enables the same restrictor device to adapt to different deadbolt lock configurations and knob positions, resolving the contradiction between fixed prevention capability and adaptability to various designs.
2Reliability
If previous devices are used to prevent rotation of the inside knob, then the knob rotation is prevented, but modification of the door is required
Solution Approach 1:
The restrictor device is nested within the existing door structure by positioning the ring member between the decorative cover plate and the door surface. This nested configuration utilizes the existing space without requiring modifications to the door itself, simplifying installation while maintaining effective knob rotation prevention.
Solution Approach 2:
The device is designed to be installed before any door modification is needed, utilizing the existing interface between the cover plate and door. The pre-configured ring member with adjustable latch positioning allows for straightforward installation that prevents unauthorized access without requiring subsequent door alterations.
3Reliability
If the latch is positioned to block the knob, then rotation is prevented, but the device must work with both right and left-handed locks
Solution Approach 1:
The adjustable positioning mechanism allows the latch to be positioned at different locations around the ring member's circumference, enabling adaptation to both right-handed and left-handed lock orientations. This dynamic adjustability maintains reliable knob rotation prevention while accommodating different lock configurations.
Solution Approach 2:
The device accommodates asymmetric lock orientations (right-handed vs. left-handed) through adjustable positioning. The latch can be positioned on either side of the ring member to match the specific orientation of the deadbolt lock, ensuring effective rotation prevention regardless of the lock's handedness.
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
Effectively prevents unauthorized access by securely locking the inside knob with the deadbolt lock, allowing use with various deadbolt locks, including both right and left-handed models, without requiring door modifications.
Implementation Method 1
a spring loaded piston disposed between the cam surface and the flange surface on the ring member. The spring-loaded piston exerts pressure on the receiving tube to forcibly hold the latch in a locked position against the turn knob
Data Source
AI summary
A deadbolt knob restrictor used to prevent the rotation of the inside knob on the deadbolt lock. The restrictor includes a ring member designed to fit between the cover plate located on the inside surface of the door. Attached to the ring member are two perpendicularly aligned support arms with a pin-style hinge formed on their distal ends. Attached to the hinge is an L-shaped latch. Formed on the latch is a cam surface which presses against a spring loaded piston disposed between the cam surface and the support arm. The latch includes a long leg that may be disposed transversely over the ring member, and a short leg that may be placed adjacent to the wide surface of the deadbolt lock's turn knob to prevent its rotation. During assembly, the ring member is placed under the locks inside cover plate. During use the piston forcibly holds the latch in a locked or unlocked position against the turn knob. The latch may be rotated in the opposite direction so that the turn knob is free to rotate to the unlock position.