Push Button Door Lock Cam Mechanism
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Solution Overview
Problem
Existing door locks often inadvertently disengage when the interior handle is rotated, and users frequently confirm the lock's engagement by rotating it, leading to unintended disengagement. There is a need for a door lock that can be both engaged and disengaged by depressing the same button without rotating the interior or exterior levers or knobs.
Innovation Solution
A door lock mechanism that allows operation by rotating either a knob or lever on either side of the door, with a push button for engagement and disengagement. The lock is activated by depressing the button once to secure the latch and prevent rotation, and deactivated by depressing it a second time, using a cam and locking spindle mechanism to transfer rotational motion and maintain the lock's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock is actuated by depressing a push button, then the lock can be engaged and disengaged without rotating the handle, but the mechanism becomes more complex
Solution Approach 1:
A cam mechanism acts as an intermediary between the push button and the locking spindle. The cam converts the linear motion of the push button into rotational motion of the locking spindle, enabling lock engagement/disengagement without rotating the handle. This intermediary mechanism resolves the contradiction by providing reliable lock control through a dedicated actuation method while maintaining operational simplicity.
Solution Approach 2:
The traditional mechanical system requiring handle rotation to engage/disengage the lock is replaced with a push button actuation system. The push button directly controls the locking mechanism through the cam and locking spindle, eliminating the need for handle rotation and providing more reliable lock control independent of handle position.
2Reliability
If the lock prevents rotation of the interior handle when engaged, then security is improved, but the user cannot easily confirm lock engagement by rotating the handle
Solution Approach 1:
The cam mechanism provides tactile feedback to the user when the lock is engaged or disengaged. As the push button is pressed and the cam rotates the locking spindle, the user can feel the mechanical engagement and disengagement through the push button, providing clear feedback on lock status without requiring handle rotation. This resolves the contradiction by maintaining security while enabling easy status confirmation through tactile feedback.
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
Ensures secure door closure by preventing accidental disengagement through button operation, allowing the door to be locked and unlocked reliably without rotating the handles, enhancing security and usability.
Implementation Method 1
A spring in mechanical engagement with the push button returns the push button following the manual depression.
Data Source
AI summary
A door locking mechanism is contained within a cartridge for use with a tubular style door lock. The cartridge activates and deactivates the door lock with a manual depression of a push button. Depressing the push button causes a cam to rotate thus converting the axial motion of the push button into a rotary motion thereby activating the door lock. Once locked, both the interior and exterior door knobs may not be rotated. In order to unlock the door, the push button is depressed a second time thereby rotating the cam in an opposing direction and deactivating the door lock.