Rotary Lock Actuator with Segmented Drive for Dual Operation
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Solution Overview
Problem
Existing locking devices require manual operation to switch between key and powered actuation, limiting convenience and security, especially in applications like vehicle compartments, where multiple locks need to be managed efficiently.
Innovation Solution
A compact actuator assembly with a housing, motor, and dual drive members allowing both manual and powered actuation, enabling 90° motion conversion for lock mechanisms, allowing either key or electric operation without modifying existing lock structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key-operated lock cylinder is used to manually rotate the cam, then the lock can be securely locked, but the key can be removed leaving the lock plug fixed, preventing powered actuator from rotating the cam
Solution Approach 1:
The drive member is segmented into a first drive surface and a second drive surface spaced apart, allowing independent engagement by either the key-operated lock cylinder or the powered actuator. This segmentation enables both manual and powered actuation to operate the cam independently without interference.
Solution Approach 2:
The drive member is designed with multiple drive surfaces that can be engaged by different actuation methods (manual key operation and powered actuator). This multi-functionality allows the same drive member to serve both manual locking and powered actuation purposes, eliminating the conflict between key removal and powered operation.
2Extent of automation
If linear actuators and linkages are used to convert linear motion to rotary motion for existing locks, then powered actuation is achieved, but the device complexity increases significantly
Solution Approach 1:
The patent replaces complex mechanical motion conversion systems (linear actuators with rods, cams, and linkages) with a simplified rotary actuator that directly provides rotational motion. The drive member with spaced drive surfaces directly receives rotary motion from the powered actuator and transmits it to the cam, eliminating the need for motion conversion mechanisms.
3Adaptability or versatility
If existing key-only locking handles are modified to add electric function, then dual operation capability is achieved, but the ease of manufacture decreases due to redesign requirements
Solution Approach 1:
The drive member is designed with dynamic engagement capability, where either the key-operated lock cylinder or the powered actuator can engage the drive surfaces as needed. This dynamic design allows existing lock structures to maintain their original functionality while adding powered actuation capability through simple integration of the powered actuator and drive member assembly.
Data Source
AI summary
A rotary lock actuator for manual or powered actuation of a lock of the type typically used on vehicle doors or storage compartments. The actuator has a housing with a motorized drive train therein. An actuating member is movable between first and second positions. A manual drive member and a powered drive member each have first and second drive surfaces spaced apart from one another. A drive finger is disposed in the spaces between the first and second drive surfaces of each drive member such that the drive finger is engageable with the actuating member. The first driving surface of each drive member engages the finger for moving the actuating member from a first position toward a second position upon movement of one of the drive members. The drive finger is engageable by the second driving surface of each drive member for moving the actuating member from a second position toward the first position upon movement one of the drive members. A bi-stable spring assists movement of the actuating member.