Espagnolette Handle Nesting in Window Lock Case
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Solution Overview
Problem
Existing lock devices for double-leaf doors and windows face challenges in simplifying the actuation of locking rods without increasing installation space, as known designs either require a flat hand lever for difficult operation or a large construction volume for the actuating handle.
Innovation Solution
The locking rod actuating handle is positioned inside the bolt or latch receiving recess in the passive wing lock's lock case, allowing for easy access and operation, with a return spring and guide groove to facilitate manual actuation and prevent jamming, and can be designed as an L-shaped or pivoting handle with a stop device for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuating handle is lowered into a separate receiving chamber in its rest position, then the actuating handle can be easily accessed, but the construction volume increases
Solution Approach 1:
The actuating handle is nested within the bolt receiving recess or latch receiving recess of the lock case. In its rest position, the handle is received inside these recesses, which are already part of the lock case structure. This nesting approach allows the handle to be accessible without requiring a separate receiving chamber, thus avoiding increased construction volume while maintaining ease of operation
2Volume of stationary object
If the actuating handle is designed as a flat hand lever, then the construction volume is reduced, but the ease of actuation deteriorates
Solution Approach 1:
The actuating handle is designed with an L-shape configuration, where one leg provides a compact profile for reduced volume while the other leg extends to provide a sufficient actuation surface. This local differentiation of the handle geometry allows it to maintain a compact overall form while still providing adequate leverage and ease of actuation for the locking rods
3Volume of stationary object
If the actuating handle is positioned inside the bolt receiving recess or latch receiving recess, then the construction volume is reduced and accessibility is improved, but the risk of jamming increases
Solution Approach 1:
A return spring is introduced as an intermediary element between the actuating handle and the locking mechanism. The return spring continuously applies a force to the handle, ensuring it returns to its rest position and preventing it from becoming stuck or jammed in the actuated position. This mediator element reliably resets the handle without increasing the overall construction volume
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
This configuration simplifies the actuation of locking rods, reduces the risk of jamming, and maintains a compact design, ensuring easy operation and efficient locking mechanism functionality.
Implementation Method 1
The lock device preferably has a return spring. In this case, the actuating handle can be acted upon by the return spring. The return spring returns the latch bar actuator handle from the actuated position to the rest position.
Implementation Method 2
The lock case of the passive lock preferably has a guide groove and/or a guide slot for a guide pin fixed to the actuating handle. This simplifies manual actuation of the actuating handle and counteracts jamming of the actuating handle.
Data Source
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AI summary
The locking device has an active sash lock for mounting in or on an active leaf (1) with a lock box (10k) with a lock mechanism with an extendable and retractable lock bolt (10f) and an extendable and retractable latch (10r). A connecting unit (10n) is arranged in the lock box and is provided for an actuating handle for removing and retracting the lock bolt and the latch. A lock cylinder is connected for key operation with the lock bolt and the latch. Another connecting unit is arranged in another lock box (20k) of a passive sash lock (20).