Electric Strike Mode Switching via Single Control Screw
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Solution Overview
Problem
Existing dual-mode electric strikes require complex and tedious processes to switch between fail-safe and fail-secure modes, involving precise alignment and removal of screws, which is cumbersome and prone to errors.
Innovation Solution
A simplified electric strike design that allows mode switching between fail-safe and fail-secure by positioning a single mode control screw through a two-position slot, enabling movement and tightening without screw removal, thus controlling the actuating device's position to change operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple screws are used to control the holder position for mode switching, then the mode switching capability is achieved, but the installation process becomes complex and tedious requiring precise alignment and removal of screws
Solution Approach 1:
The housing is segmented to include a slot that guides the single screw's movement path, allowing the screw to automatically position the holder at correct locations without requiring multiple separate fastening operations or precise manual alignment
Solution Approach 2:
A single mode control screw performs multiple functions: it acts as both a fastening element and a positioning element, and by moving along the slot it controls the holder's position to achieve different operational modes, replacing the need for multiple dedicated screws
2Adaptability or versatility
If multiple screws are removed and repositioned for mode switching, then dual-mode operation is achieved, but the process becomes prone to errors and time-consuming
Solution Approach 1:
The mode control screw is designed to be movable along a defined slot path rather than fixed in position, allowing dynamic repositioning of the holder between two stable positions (first and second locations) to switch between fail-safe and fail-secure modes without complete disassembly
Solution Approach 2:
The slot is pre-configured in the housing to guide the screw's movement path between the two holder positions, so the alignment work is done in advance during manufacturing, eliminating the need for precise field alignment during installation or mode switching
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
Facilitates easy and reliable switching between fail-safe and fail-secure modes without the need for intricate screw alignment, enhancing user convenience and reducing installation errors.
Implementation Method 1
An actuator configured to selectively move the blocking element
Data Source
AI summary
An electric strike comprising a housing and a keeper pivotally mounted to said housing. A solenoid is arranged internal to the housing and movable between fail-safe and fail-secure positions. A two position mode control slot is included in the housing and a mode control screw is included in the mode control slot. The screw is capable of being tightened in each of the two positions in the control slot. The screw is changeable between the two of the positions without removal of the screw. The solenoid is in the fail-safe position when the screw is in one of the two positions and in the fail-secure position when the screw is in the other of the two positions.