Pivoting Clamping Pawl for Double-Leaf Door Lock
Solution Overview
Problem
Existing sliding rod switch locks for double-leaf doors lack an efficient mechanism to securely hold the locking bar in place without protruding from the door, potentially damaging the floor, and require complex mechanisms to manage the movement and locking of the locking bars.
Innovation Solution
A sliding rod switch lock with a clamping pawl that pivots about a transverse axis, featuring a spiral clamping surface pressed by a torsion spring against the locking rod, and a trigger with a ramped guide section that releases the pawl to allow the locking bar to move into a counter-locking position when the trigger is actuated, ensuring secure locking and preventing upward displacement of the locking bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-loaded clamping plate is used to hold the locking bar in place, then the locking bar is securely held, but the mechanism becomes complex and difficult to operate
Solution Approach 1:
The patent extracts the clamping function from a complex spring-loaded plate mechanism and isolates it into a simple pawl element. The pawl is a single pivoting component that provides sufficient clamping force through its geometric shape and pivot point, eliminating the need for complex spring assemblies while maintaining reliable locking.
Solution Approach 2:
Instead of using a complex mechanism to actively clamp the locking bar, the invention uses a simple pawl that passively resists upward movement through its pivot geometry. The clamping action is inverted from an active spring-loaded system to a passive geometric constraint system, simplifying the mechanism while maintaining reliability.
2Object-affected harmful factors
If the locking bar is held in place to prevent protrusion, then floor damage is prevented, but the locking mechanism becomes less responsive
Solution Approach 1:
The pawl is designed as a dynamic element that can pivot between a clamping position (when the locking bar is in the correct position) and a release position (when the trigger is actuated). This dynamic behavior allows the system to automatically prevent floor damage while remaining highly responsive to legitimate unlocking operations through the trigger mechanism.
Solution Approach 2:
The trigger acts as an intermediary element between the user and the locking bar. When the trigger is actuated, it mediates the release of the pawl from its clamping position, allowing the locking bar to move freely. This intermediary mechanism ensures that the locking bar remains secured under normal conditions but can be quickly released when needed, balancing protection with responsiveness.
3Device complexity
If a simple guide opening is used for the locking bar, then the mechanism is simplified, but the locking bar may protrude and damage the floor
Solution Approach 1:
The locking mechanism is segmented into distinct functional elements: the guide opening provides a simple path for the locking bar, while the separate pawl element provides the clamping function. This segmentation allows each component to be optimized independently - the guide opening remains simple while the pawl handles the protection function, achieving both simplicity and safety.
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
The solution effectively secures the locking bar in place, preventing it from protruding and allowing smooth operation of the locking mechanism, ensuring the fixed leaf of a double-leaf door remains closed without damaging the floor, while simplifying the mechanism for easy operation.
Implementation Method 1
The pawl has a clamping surface which runs essentially on a spiral curve in relation to the pivot axis and which is pressed by a spring, in particular a torsion spring, against the outer lateral surface of the locking rod.
Implementation Method 2
The trigger is advantageously stored there with a rectangular guide section. The guide section forms a cavity, which ends in a ramp that runs at an angle. The locking bar is guided in this cavity.
Data Source
AI summary
The invention relates to a push-rod switch lock, in particular for a drive rod lock on a fixed leaf of a double-leaf door, comprising a bolt (6) extendable from an open position to a locked position through a passage opening (12, 17) in a faceplate (2), a clamping element (3) which, in a clamping position, prevents the bolt (6) from extending in the open position, and a release element (5) which, upon movement from a ready position to a release position, moves the clamping element (3) from the clamping position to a release position, so that the bolt (6) can extend into the closed position. To further develop the lock advantageously, it is proposed that the clamping element (3) be a latch (3) pivotable about a pivot axis (4) directed transversely to the movement direction of the bolt (6).