Window Handle Wedge Recess for Easy Replacement
Solution Overview
Problem
In outwardly opening window or door assemblies, replacing the handle is difficult as the entire housing of the locking device must be removed, and design restrictions limit the handle's form to fit through the actuation opening.
Innovation Solution
The handle features a partially circular engagement portion with a wedge-shaped recess that engages a pivotably arranged wedge-shaped element in the housing, allowing easy removal without passing through the actuation opening, and a pin for secure attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the handle is designed to pass through the actuation opening for removal, then the handle can be replaced, but the design is restricted and replacement is difficult
Solution Approach 1:
The locking device is divided into separate components: the housing remaining in the sash and the handle that can be independently removed. The engagement portion with wedge-shaped recess and corresponding wedge-shaped element creates a segmented connection that allows handle replacement without removing the entire locking device housing.
Solution Approach 2:
The handle is extracted as a separate removable component from the locking device. The engagement portion with wedge-shaped recess allows the handle to be taken out through the actuation opening without requiring removal of the entire locking device housing, simplifying the replacement process.
2Ease of operation
If the engagement portion is made circular for easy removal, then the handle can be lifted out, but a close fit is needed to prevent dirt entry
Solution Approach 1:
The engagement portion is designed with a circular cross-section, allowing the handle to be removed by lifting it out through the actuation opening. The circular shape facilitates easy extraction while the wedge-shaped engagement mechanism ensures a secure fit during operation.
Solution Approach 2:
The wedge-shaped recess and corresponding wedge-shaped element create a localized engagement zone that provides a close fit to prevent dirt entry, while the overall circular engagement portion allows easy removal. Different parts of the engagement mechanism have different functions: secure engagement versus easy removal.
3Ease of repair
If the pin is made accessible in the unlocked position for handle removal, then the pin can be removed, but it must be invisible in the locked position for security
Solution Approach 1:
The pin's accessibility is dynamic rather than static. The pin is positioned such that it becomes accessible only when the handle is in the unlocked position, and is hidden when the handle is in the locked position. This dynamic positioning provides both security and ease of detachment when needed.
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
Facilitates easy handle replacement and maintenance while maintaining a close fit and protecting the engagement mechanism from dirt, with enhanced security features like self-locking and tamper-proof mechanisms.
Implementation Method 1
a wedge shaped recess that is releasably engaged with a correspondingly shaped wedge shaped element pivotably arranged in the housing
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
The outwardly opening window or door assembly (1) comprises a sash (3) mounted in a frame (2). A locking device (7) comprises a housing (101) being mounted in a cavity of a sash member. A handle (102) is adapted to displace a locking element (8, 9) between a locked position and an unlocked position. The handle (102) protrudes through an actuation opening (114) in a face (136) of the sash member being substantially at right angles to the window pane (4) or door leaf. The handle (102) is provided with an at least partially circular engagement portion (133) extending through the actuation opening (144) in the face of the sash member, and the at least partially circular engagement portion (133) is provided with a wedge shaped recess (110) that is releasably engaged with a correspondingly shaped wedge shaped element (111) pivotably arranged in the housing (101).