Push-Push Door Lock with Integrated Blocking Device
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Solution Overview
Problem
Existing door locking mechanisms for caravans and mobile homes, particularly those using a push-push mechanism, are prone to unintentional opening due to their ease of operation, which can be problematic in windy conditions or during sudden air pressure changes, and require additional security measures that add complexity and effort.
Innovation Solution
A blocking device integrated within the closure device that interacts with the locking element to prevent unintentional opening, featuring a guide with distinct areas for locking, blocking, and release, allowing secure locking without additional components, and can be actuated by a motor or emergency release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a push-push locking mechanism is used for door operation, then ease of operation is improved and external handles are eliminated, but reliability deteriorates due to susceptibility to unintentional opening from air pressure changes
Solution Approach 1:
The locking mechanism is divided into two independent but coordinated locking elements: a first locking element (locking bolt) and a second locking element (latch). The first locking element engages with a first locking counterpart, while the second locking element engages with a second locking counterpart. This segmentation allows the door to be locked through multiple independent engagement points, preventing unintentional opening while maintaining the push-push operation mechanism.
2Reliability
If additional security devices such as sash fasteners or locking bolts are added to prevent unintentional opening, then reliability is improved, but device complexity increases
Solution Approach 1:
The first and second locking elements are integrated into a single closure device assembly that operates together. The locking elements are coordinated such that both must be engaged to fully secure the door, combining multiple locking functions into one unified mechanism. This merging approach provides enhanced security without requiring separate, independently operated security devices, thereby controlling overall device complexity.
Solution Approach 2:
The closure device performs multiple functions: it enables push-push door operation, provides primary locking through the first locking element, and provides secondary locking through the second locking element. This multi-functionality consolidates what would traditionally require separate devices (push-push mechanism plus additional security locks) into a single universal locking system.
Data Source
Figure 1~4
Figure 5a~6b
Figure 7
AI summary
The invention relates to a locking device for a door (2), in particular for a door of a caravan or motorhome, with a movable locking element (3) which engages in a locking counterpart (4) in the closed position (S) and pre-locks the door (2), wherein the locking element (3) and the locking counterpart (4) are designed such that they act together as a push-push lock, wherein a blocking device (5) which can block movement of the locking element (3) for the main locking of the door (2).