Axial Handle Assembly Child Safety Blocking Mechanism
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Solution Overview
Problem
Existing door and window handle assemblies lack effective safety mechanisms to prevent young children from opening doors or windows, particularly for lever-type handles, which are not addressed by current safety locks that are cumbersome or limited to specific types of handles.
Innovation Solution
A handle assembly with a first handle grip that is rotatable and axially movable, featuring a blocking mechanism that can be transformed between blocking and non-blocking configurations, allowing axial movement to convert between latch-operating and non-latch-operating modes, incorporating a spindle for driving the latch mechanism and biasing means to secure the handle in place, preventing young children from opening the door or window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety lock is added to prevent children from opening doors, then child safety is improved, but device complexity increases
Solution Approach 1:
The safety blocking mechanism is merged with the handle assembly itself, integrating the safety function into the existing handle structure rather than adding a separate safety device. The blocking means includes a blocking projection on the spindle that interacts with the housing, combining safety functionality with the operational handle components.
Solution Approach 2:
The handle assembly serves multiple functions: normal door operation through handle rotation, and child safety protection through the blocking mechanism. The same handle structure and spindle serve both the operational function and the safety blocking function, eliminating the need for separate safety devices.
2Ease of operation
If a blocking mechanism is integrated into the handle assembly, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The blocking mechanism is merged with the handle assembly components. The blocking projection is formed on the existing spindle, and the blocking means interacts with the housing structure, combining safety functionality with operational components to maintain simplicity.
Solution Approach 2:
The blocking mechanism operates automatically based on the position of the handle grip. When the handle grip is in the closed position, the blocking projection engages with the blocking means to prevent rotation. The mechanism self-regulates without requiring external control or complex actuation systems.
3Reliability
If axial movement is required to enable latch operation, then child safety is improved, but ease of operation worsens
Solution Approach 1:
The handle grip is designed to be movable axially relative to the housing, allowing it to transition between different operational states. This dynamic positioning enables the blocking projection to engage or disengage from the blocking means, providing both safety blocking and operational functionality through simple axial movement.
Solution Approach 2:
The mechanism transitions from preventing rotation in the horizontal plane to enabling rotation by moving in the axial dimension. By adding this vertical/axial degree of freedom, the system allows adults to overcome the blocking mechanism through simple push/pull motion while maintaining rotational blocking for children.
4Reliability
If the blocking means prevents handle rotation, then child safety is improved, but device complexity increases
Solution Approach 1:
The blocking means is integrated into the existing handle assembly housing, utilizing the same structural components. The blocking projection on the spindle interacts with a corresponding feature in the housing, merging the safety blocking function with the operational handle structure without requiring separate blocking components.
Solution Approach 2:
The blocking mechanism is passive and self-actuating. The blocking projection automatically engages with the blocking means when the handle grip is in the closed position, providing safety without requiring active control systems, motors, or complex actuation mechanisms.
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 handle assembly effectively secures doors or windows without locking, preventing young children from opening them by transforming the blocking mechanism to allow adult operation while maintaining safety through axial movement and biasing, ensuring the handle can be easily converted between operational states.
Implementation Method 1
moving the handle grip axially along the handle axis
Implementation Method 2
the first handle grip being moveable rotatably and axially relative to a handle axis
Implementation Method 3
the first spindle being fixed relative to the first handle grip such that the first spindle moves with the first handle grip as the first handle grip is rotated and/or translated axially
Implementation Method 4
the second spindle is configured to rotate upon rotation of the second handle grip in order to drive the latch of said latch mechanism but to be slideable relative to the second handle grip such that the second handle grip does not move axially as the first handle grip is moved axially
Implementation Method 5
in the blocking configuration the first handle grip is prevented from being rotated from the closed position to the open position by the blocking means
Implementation Method 6
latch mechanisms for holding the door closed, by means of a latch which engages in a recess or keep in the door jamb
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A handle assembly for a window or door leaf, the handle assembly comprising: a first handle grip, the first handle grip being moveable rotatably and axially relative to a handle axis, the handle grip having a closed position, wherein the handle grip is in a first angular position and an open position, wherein the handle grip is in a second angular position, the handle assembly having a latch-operating configuration in which the handle assembly is configured for driving a latch between a latched position and a released position, and a non-latch-operating configuration in which the handle assembly is non-operable for driving the latch, wherein the handle assembly is configured such that the handle assembly is transformed from the non-latch-operating configuration to the latch-operating configuration by moving the handle grip axially along the handle axis.