Door Lock with Detachable Latch for Quick Conversion
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Solution Overview
Problem
Existing door and window locks are laborious to replace or convert between different types, requiring disassembly of the lock case and limiting their versatility and cost-effectiveness for various door applications.
Innovation Solution
A door or window lock design featuring a detachable bayonet catch for the lock latch shaft, allowing easy orientation and replacement of the lock latch or dead bolt, enabling conversion between left-hand and right-hand doors without opening the lock case, and facilitating the use of different types of locks such as rolling dead bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock latch is fixed in the holder in a non-detachable manner, then the lock structure is more stable and reliable, but replacing or converting the lock latch becomes laborious and time-consuming requiring disassembly of the lock case
Solution Approach 1:
The lock system is divided into separable components: the lock latch (with shaft) can be independently removed from the holder without disassembling the entire lock case. The holder remains in the lock case while the lock latch is extracted through the opening, enabling easy replacement while maintaining structural integrity during operation.
Solution Approach 2:
The lock latch is extracted from the holder through the opening in the lock case by pulling it outward. This extraction mechanism allows the lock latch to be removed and replaced without opening the lock case, solving the contradiction between structural stability and ease of replacement.
2Ease of operation
If the lock latch protrudes entirely outside the lock case, then the lock latch can be easily accessed, but the body may break off from the lock latch where it is fixed to the shaft
Solution Approach 1:
The notched outwards-facing side of the holder prevents the lock latch from being pulled out too far by creating a mechanical stop. This preliminary restriction prevents the harmful condition where the lock latch body would break off at the shaft connection point, while still allowing sufficient protrusion for operation.
3Reliability
If a fixed stop is used to restrict the protrusion distance of the lock latch, then the lock latch operation is guaranteed, but the lock cannot be easily converted between different door types (left-hand/right-hand)
Solution Approach 1:
The stop mechanism is made dynamic and adjustable. The holder can be rotated within the lock case to change the orientation of the notched outwards-facing side, thereby adjusting the stop position and direction. This allows the same lock mechanism to be adapted for different door configurations (left-hand or right-hand doors) while maintaining reliable operation through the stop restriction.
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
Enables quick and easy conversion of locks between different door types without disassembly, reducing costs by allowing a single lock to be used for various applications and extending the lifespan of locksmith stock.
Implementation Method 1
a spring (20) which pushes the lock latch (9) outwards
Implementation Method 2
The shaft of the lock latch or dead bolt is preferably fixed in the holder in a detachable manner by means of for example a bayonet catch
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Door or window lock which mainly consists of a lock case (2) in which has been provided a movable dead bolt (9, 51) between a position in which a body (10) of the dead bolt (9, 51) is situated entirely or almost entirely in the lock case (2) and a position of rest in which this body (10) is situated largely outside the lock case (2) and whereby a stop is provided in the lock case (2) which restricts the movement of the dead bolt (9, 51) outside the lock case (2), characterised in that the dead bolt (9, 51) is fixed in the lock case (2) in a rotatable or detachable manner and in that the above-mentioned stop is variable, such that the body (10) of the dead bolt (9, 51) can be moved entirely outside the lock case (2) without opening the lock case (2).