Pre-Fixed Scissor Mechanism Leaf Unit for Window Fitting Installation
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Solution Overview
Problem
The installation of scissor mechanisms in window or door leaf fittings is complex and costly due to the need for precise alignment and securement of scissor units within C-shaped grooves, with existing methods either being difficult to modify once installed or requiring numerous components for front installation.
Innovation Solution
The scissor guide and rod are pre-fixed in a middle position between closed and tilt positions, allowing them to be handled as a single unit for easier installation, with a positive locking mechanism and a shearable fixing journal ensuring correct alignment and securement, and a mounting head with a stop ensures precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the scissor rod is made movable relative to the scissor guide for operational flexibility, then the functionality of the scissor mechanism is improved, but the installation complexity increases due to the need for precise alignment and securement
Solution Approach 1:
The scissor rod and scissor guide are pre-fixed together in a predetermined relative position during manufacturing, creating a pre-assembled unit. This preliminary action eliminates the need for complex alignment procedures during installation, as the entire unit is installed as one component rather than requiring field assembly of separate movable parts
Solution Approach 2:
The scissor rod and scissor guide are combined into a single pre-assembled unit with a fixed relative position. By merging these two components that would otherwise require complex alignment and securement, the invention simplifies the installation process while maintaining the operational flexibility needed for the scissor mechanism to function
2Ease of operation
If front installation method is used to allow easy access and installation, then the ease of operation is improved, but the quantity of components increases requiring numerous securing elements
Solution Approach 1:
The scissor rod and scissor guide are merged into a pre-assembled unit, reducing the total number of separate components that need to be installed and secured. This merging maintains the ease of front installation while eliminating the need for numerous securing elements that would be required if the components were installed separately
3Reliability
If end-side installation is used to secure fitting parts firmly, then the reliability is improved, but the ease of operation deteriorates making replacement difficult once installed
Solution Approach 1:
The scissor rod and scissor guide are pre-assembled into a single unit during manufacturing, creating a reliable pre-fixed connection. This preliminary action ensures proper securement is achieved during production under controlled conditions, while simultaneously making replacement easier since the entire pre-assembled unit can be removed and replaced as one component rather than disassembling multiple secured parts in the field
Data Source
AI summary
A leaf unit of a scissor mechanism of a fitting for a leaf of a window or of a door, insertable into a C-shaped leaf groove in the rebate of a leaf profile of the leaf is provided. The leaf unit includes a scissor guide fastenable on the leaf and a scissor rod moveable relative to the scissor guide in the operating state. The scissor rod is movable between a closed position and a tilt position relative to the scissor guide in the operating state. The scissor guide and the scissor rod are pre-fixed for insertion into the leaf groove in a pre-installation position which is between the closed position and the tilt position.