Electric Door Strike Assembly for Preload Release and Low Power
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Solution Overview
Problem
Existing electric door strike assemblies struggle with preload forces that prevent the keeper assembly from moving to an unlocked state, leading to failure in opening the door and increased power consumption regardless of door conditions.
Innovation Solution
An electric door strike assembly with a locking mechanism featuring a blocking drum and blocking members that adapt to preload forces, allowing low-power operation by selectively moving between locked and unlocked states based on door conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solenoid is used to move the keeper assembly from locked to unlocked state, then the door can be opened, but the power consumption is high (six watts) and cannot adapt to different door conditions
Solution Approach 1:
The patent applies dynamics by making the blocking drum rotatable to dynamically change the position of blocking members. The blocking drum can rotate between a first position where blocking members engage the keeper assembly (locked state) and a second position where they disengage (unlocked state). This dynamic mechanism allows the system to adapt to different door conditions including preload forces, enabling reliable door opening while consuming less power compared to a static solenoid system that requires high continuous power.
2Reliability
If the blocking members are engaged with the keeper assembly to maintain locked state, then the door remains secure, but the mechanism cannot overcome preload forces when opening
Solution Approach 1:
The patent introduces an intermediary element - the rotatable blocking drum - that mediates between the blocking members and the keeper assembly. The blocking drum acts as a mediator that can selectively engage or disengage the blocking members from the keeper assembly by rotating between different positions. This intermediary mechanism allows the system to maintain strong engagement during normal operation for security, while enabling easy release when opening is required, even against preload forces.
Data Source
AI summary
A locking mechanism for an electric strike comprises an outer body including first and second openings each including distal edges, and a blocking drum movable between blocking and unblocking positions. The blocking drum includes an outer surface having first and second recesses. First and second blocking members are disposed within the first and second openings, respectively. When the blocking drum is in the blocking position, the first and second blocking members are engaged with the outer surface of the blocking drum, and at least a portion of the first and second blocking members extend outwardly from the respective first and second distal edges to place the electric strike in a locked position. When the blocking drum is in the unblocking position, at least a portion of the first and second blocking members are disposed within the first and second recess, respectively, to place the electric strike in an unlocked position.