Push Rod Locking Mechanism for Door Fitting Wear Reduction
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Solution Overview
Problem
Conventional push rods for door locks, particularly in escape doors, experience increased wear due to lack of recognizable resistance when a swing door function is activated, leading to reduced service life.
Innovation Solution
A push rod design featuring a cylindrical locking element that can be moved into the base and cover profiles, allowing the cover profile to be fixed near its end position, preventing further displacement and distributing user force through the base profile, thus reducing wear and tear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the door lock is directly actuated on the operating element without a locking mechanism, then the swing door function can be achieved with simple design, but the door fitting experiences increased wear and reduced service life due to lack of recognizable resistance
Solution Approach 1:
The locking element provides preliminary resistance before the cover profile can be actuated, preventing the door lock from being directly actuated. This preliminary anti-action creates recognizable feedback for the operator and prevents excessive wear by blocking the actuation path when the swing door function is activated, thus extending service life while maintaining simple design
Solution Approach 2:
The locking element acts as an intermediary between the cover profile and the door lock mechanism. When engaged, it mediates the force transmission by providing mechanical resistance and preventing direct actuation of the door lock, thereby protecting the door fitting from excessive wear while maintaining the simplicity of the overall design
2Ease of operation
If the cover profile is allowed to displace freely between initial and end positions, then the door lock can be actuated, but excessive force acts on the door fitting causing increased wear when swing door function is activated
Solution Approach 1:
The locking element provides preliminary resistance by engaging with the cover profile at or near the end position, creating a mechanical stop that prevents further displacement. This preliminary anti-action protects the door fitting from excessive force and wear while allowing normal door actuation when the locking element is disengaged
3Reliability
If a locking mechanism is added to fix the cover profile at the end position, then wear on door fitting is reduced, but the device complexity increases
Solution Approach 1:
The locking element is designed as a separate, extractable component that can be mounted on the base profile and engaged with the cover profile. This extraction principle allows the locking function to be added as a modular element rather than integrating complexity into the main door fitting structure, thereby extending service life while minimizing increase in overall device complexity
Solution Approach 2:
The locking element is designed to be self-contained with its own actuating mechanism (push button with cylindrical shaft), eliminating the need for additional control systems or complex actuation mechanisms. This self-service design provides the locking function with minimal added complexity
Data Source
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AI summary
A push rod (10) for actuating a door latch, in particular a door catch, with a base profile (12) for attachment to the door and with a cover profile (14) which is preferably displaceable parallel to the base profile (12) and serves as an actuating element for the door latch, and which is movable between an unactuated initial position (16) and a fully actuated end position (18), is designed and further developed with a view to a long service life of a door fitting for various door functions such that the cover profile (14) can be locked in or near its end position (18) by at least one locking element (24) relative to the base profile (12), so that the door latch is fixed in the actuated state when the cover profile (14) is locked.