Door Lock Handle Assembly with Frictional Rod and Snap Indexing
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Solution Overview
Problem
Existing manual control devices for door and window locks require pre-assembled components, specific tools, and electrical energy for assembly, limiting customization and increasing component complexity and storage logistics.
Innovation Solution
A manual control device with a support body, rotatable gripping member, and quick blocking elements, featuring a frictionally engaged control rod and elastic snap-fitting members for angular indexing, allowing on-site assembly with fewer components and customizable finishings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pre-assembled handle components are used, then assembly is simplified, but customization capability is lost and component complexity increases
Solution Approach 1:
The handle assembly is divided into separate modular components: handle body, support body, control rod, and indexing means. These segments can be individually selected and customized based on customer requirements, then assembled on-site using the simple insertion method through the control rod, eliminating the need for pre-assembly while enabling customization.
Solution Approach 2:
The control rod serves multiple functions: it connects the handle body to the support body, transmits rotational motion, and enables simple assembly through friction engagement. The support body also provides both structural support and houses the indexing mechanism. This multi-functionality reduces the number of separate components needed, simplifying assembly while maintaining customization options.
2Stability of the object's composition
If specific tools and electrical energy are used for assembly, then fixing stability is improved, but assembly complexity and energy requirements increase
Solution Approach 1:
The control rod and support body are designed to self-assemble through friction engagement without requiring external tools or electrical energy. The control rod is simply inserted into the support body, and friction between the surfaces provides sufficient holding force for stable assembly, eliminating the need for complex fixing mechanisms or energy-consuming assembly processes.
Solution Approach 2:
The invention replaces complex mechanical fixing systems (screws, welds, or tool-required fasteners) with a simple friction-based engagement system. The control rod relies on frictional forces against the support body surfaces to maintain stable connection, substituting elaborate mechanical assembly procedures with a straightforward insertion method that requires no tools or energy input.
3Measurement precision
If indexing means with autonomous blocks are used, then angular position control is improved, but component number and warehouse management complexity increase
Solution Approach 1:
The indexing means are integrated directly into the support body structure rather than being separate autonomous blocks. The support body includes built-in indexing features that engage with corresponding features on the control rod or handle body, providing precise angular position control while reducing the total component count. This merging eliminates the need for separate indexing components that would otherwise need to be managed in warehouse inventory.
Solution Approach 2:
The support body serves dual functions: it provides structural support for the assembly and simultaneously houses the indexing mechanism. This multi-functionality reduces the need for separate dedicated indexing components, decreasing the overall number of parts while maintaining precise angular position control capabilities across different handle configurations.
4Productivity
If pre-assembled finished products are provided, then installation readiness is improved, but customization options are eliminated
Solution Approach 1:
The product is provided as segmented, pre-manufactured components rather than a pre-assembled unit. Each component (handle body, support body, control rod) is individually prepared and can be easily identified and selected based on customization requirements. The components are designed for simple on-site assembly through friction engagement, maintaining high installation readiness while enabling customer-specific customization of the final assembly.
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 rapid, secure, and precise assembly of door or window locks with reduced components, simplified logistics, and customizable options, ensuring stability and balanced supports without the need for electrical tools.
Implementation Method 1
said control rod being frictionally engaged with said at least one quick blocking element and with at least one insert of said support body adapted to increase the force opposing the axial sliding of the control rod along said support body
Implementation Method 2
said at least one snap-fitting member engaged in said blocking seat, wherein said indexing means comprise at least one blocking seat and at least one snap-fitting member engaged in said blocking seat
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The manual control device (1) of the opening and closing of the lock of a door or window comprises: a support body (3) having a longitudinal cavity (105); a rotatable manual gripping member (2) having a housing (11); a control rod (6) engaged in the cavity (105) of the support body (3); at least one quick blocking element of the axial extraction of the support body (3) from the control rod (6), the support body (3) having an end internal of the manual gripping member (2) rigidly engaged in the housing (11) and an end external of the manual gripping member (2); a support plate (120) of the support body (3) fixable to the door or window and provided with a hole (123) in which the external end of the support body (3) is rotatably engaged; and indexing means of the angular position of the manual gripping member (2), the indexing means comprising at least one blocking seat (130) and at least one snap-fitting member (131) engaged in the blocking seat (130), the blocking seat (130) or snap-fitting member (131) being formed integrally with the support body (3).