Window Handle Bayonet Lock for Tool-Free Axial Fixation
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Solution Overview
Problem
Existing solutions for mounting operating handles on doors and windows are complex, costly, and difficult to assemble, often requiring numerous components and additional tools, which complicates the installation process and reduces the structural appeal and force absorption capabilities.
Innovation Solution
A simplified design for the operating handle that uses a few individual parts with a holding element and receptacle that can be connected tool-free, featuring a bayonet lock mechanism for secure axial and rotational fixation, reducing the overall height and eliminating the need for additional tools during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the handle is connected to the stop plate at the factory with locking ring or riveting, then the connection is secure, but the installation becomes laborious and complicated requiring additional tools
Solution Approach 1:
The invention divides the handle assembly into separate components: the handle body and the stop plate with cover cap are pre-assembled as one unit, while the locking ring is a separate component that is installed later. This segmentation allows the main connection structure to be prepared in advance while the locking mechanism is applied during installation, combining secure connection with easy installation.
2Shape
If the stop plate is provided with cover cap to cover fastening screws, then the appearance is improved, but the space for tool access is reduced making installation difficult
Solution Approach 1:
The cover cap is pre-installed on the stop plate during factory assembly, creating an aesthetically pleasing appearance. The design anticipates the need for tool access by providing a specific opening in the cover cap that allows screwdriver access to the fastening screws, thus maintaining appearance quality while enabling installation.
3Reliability
If numerous components and locking devices are used to mount handle on stop plate, then the connection reliability is improved, but the device complexity and production cost increase
Solution Approach 1:
The invention combines the stop plate and cover cap into a single pre-assembled unit, reducing the number of separate components. The locking ring serves as a single unified element that provides reliable locking when engaged with the corresponding features on the stop plate and handle, achieving connection reliability with minimal components.
4Strength
If the opening in the socket is made deep to prevent fixing element from jumping out, then the axial force resistance is improved, but the structural height increases reducing visual appeal
Solution Approach 1:
Instead of increasing the axial depth of the socket opening to prevent the fixing element from jumping out, the invention uses a locking ring that engages radially with the socket and handle. This radial locking mechanism provides axial force resistance without requiring a deep socket opening, thus maintaining a compact structure with acceptable visual appeal.
Data Source
Figure 1
Figure 2
AI summary
In an operating handle (1) for a window or door, comprising a handle (10) which is axially fixed and rotatably mounted on or in a stop plate (20), wherein the handle (10) has a recess (14) on its end face into which an actuating polygon can be inserted, and comprising a bushing (40) which is supported internally on the stop plate (20), wherein the bushing (40) has a through-opening (42) for the actuating polygon and is connected to a fixing element (60) by force-fit and/or form-fit, wherein the fixing element (60) has a fixing opening (62) through which the actuating polygon can project and in which the actuating polygon can be fixed in the axial direction (L), at least one retaining element (66) is provided on the fixing element (60) and at least one retaining receptacle (48) is provided on the bushing (40) into which the retaining element (66) can be inserted. is that the retaining element (66) and the retaining receptacle (48) form a positive fit in the axial direction (L).