Espagnolette Locking Bar with Elastic Clamping Legs
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Solution Overview
Problem
Existing locking bar fittings face functional disadvantages due to significant play between locking bars and frame members, requiring precise length and complex assembly processes, which complicates the screw connection and stability of closing elements.
Innovation Solution
A locking bar with V-shaped clamping legs that can be elastically deformed to fit snugly into a longitudinal groove, featuring rows of holes for secure tooth engagement and a resilient outer leg that supports the locking bar, allowing for precise alignment and secure attachment without play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the locking bar web is made rigid to ensure structural strength, then the locking bar can maintain its shape and provide stable locking, but insertion into the longitudinal groove becomes difficult requiring pivoting which needs sufficient space and results in large play
Solution Approach 1:
The locking bar is divided into a rigid body portion and separate resilient clamping legs. The clamping legs are made elastically deformable and can be pressed together to facilitate insertion into the longitudinal groove, while the main body remains rigid for structural strength. This segmentation allows the locking bar to be inserted without pivoting while maintaining its structural integrity.
2Manufacturing precision
If the locking bar is made with exact length to ensure precise screw connection with corner fittings, then the screw connection precision is improved, but the assembly process becomes more complex and time-consuming
Solution Approach 1:
The locking bar length is made variable through the use of resilient clamping legs that can be compressed during insertion. This allows the locking bar to adapt to different groove positions and lengths, eliminating the need for exact length manufacturing. The corner fittings can be connected at various positions along the locking bar without requiring precise pre-cut lengths, simplifying the assembly process.
3Ease of manufacture
If the clamping legs are not supported on the underside to simplify the structure, then the manufacturing is easier, but the locking bar experiences large play and is only supported by projections limiting the undercut
Solution Approach 1:
The locking bar is designed with different structural qualities at different locations. The clamping legs have localized support structures (projections or ribs) at specific positions to provide upward support where needed, while maintaining overall structural simplicity. This localized reinforcement reduces play and improves locking stability without significantly complicating the manufacturing process.
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 solution ensures a tight clamp of the locking bar to the frame member, reducing play and simplifying assembly by allowing for precise length adjustment and secure attachment of corner fittings, enhancing the overall functionality and cost-effectiveness of the locking bar fitting.
Implementation Method 1
an outer leg (14) that is elastically movable relative to the inner leg (15)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The lock bar has a flange (18), and clamping brackets (13) formed with V-shaped cross-section and arranged at longitudinal sides of the flange. An outer bracket (14) is elastically moved towards an inner bracket (15). Hole rows (11) extend in a longitudinal axial direction, and formed parallel to each other in the flange. A support rod (19) is formed at an outer side of each clamping bracket in a connection area of the inner bracket with the outer bracket. A supporting part (21) is moved opposite to the support rod, where the lock bar is made from plastic, light metal or stainless steel.