Window Fitting Connecting Rod Bead Stiffening
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Solution Overview
Problem
Existing connecting rods for window and door fittings face challenges in maximizing transmissible forces while maintaining simplicity and low manufacturing costs, as they often require thicker materials to withstand high loads without significant deformation.
Innovation Solution
The solution involves attaching beads transverse to the U-flanges of the coupling piece, which stiffen the clutch shoe, allowing for the use of thinner materials and reducing manufacturing costs. These beads are strategically positioned to prevent U-flange deviation under load and can be easily integrated during the production process, potentially extending onto the U-flanges for enhanced reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thicker materials are used for the connecting rod to withstand high loads, then the load-bearing capacity is improved, but the manufacturing cost and material usage increase
Solution Approach 1:
The invention transitions from a flat U-shaped cross-section to a three-dimensional structure by adding beads (protrusions) on the U-web. This dimensional enhancement creates stiffening effects that improve load-bearing capacity without increasing the base material thickness, effectively solving the contradiction between strength and material quantity.
Solution Approach 2:
The beads are strategically positioned on the U-web to provide localized stiffening where needed. This local quality enhancement allows the connecting rod to withstand high loads in critical areas while maintaining thinner overall material thickness, reducing total material usage while preserving strength.
2Stability of the object's composition
If thicker materials are used to prevent deformation under high loads, then the structural stability is improved, but the manufacturing cost increases
Solution Approach 1:
By adding beads that protrude from the U-web in the third dimension, the invention creates structural stability equivalent to thicker materials. The beads act as stiffeners that prevent deformation under load while allowing the base material thickness to remain thin, thereby reducing manufacturing costs.
Solution Approach 2:
The connecting rod combines the base U-shaped material with additional bead structures formed from the same or different material. This composite approach creates a structure with enhanced stability that uses less total material than a solid thick section would require, reducing manufacturing cost.
3Strength
If the bead depth is increased to enhance stiffening, then the load-bearing capacity is improved, but the U-flanges may be compressed at the connection area
Solution Approach 1:
The bead depth is varied locally along its length, being greater in the central region for maximum stiffening effect and shallower near the U-flange connection areas. This local quality variation provides enhanced load-bearing capacity in the span while minimizing compression stress on the U-flanges at the connections.
Solution Approach 2:
The bead geometry parameters (depth, width, curvature) are optimized to achieve the desired stiffening effect while controlling stress distribution. By carefully selecting these parameters, the bead provides maximum structural benefit without creating excessive compression stresses at critical connection points.
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
This design enhances the load-bearing capacity of the connecting rod, enabling the use of thinner materials while maintaining or exceeding load-bearing capabilities, thus reducing production costs and machine force requirements.
Implementation Method 1
The bead forms a stiffening of the clutch shoe, so that the U-flanges do not or only insignificantly deviate outwards even under high loads
Implementation Method 2
at least one embossing process, in which at least one bead is formed from the underside of the clutch shoe opposite the U-flanges
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The connecting rod (1) is provided with longitudinally sliding function elements arranged under a fixed guide plate, particularly a cover rail or a cover angle attached to a window or door element. A flat rectangular cross section is provided with a U-shaped coupling shoe (2). A coupling teething (6) is provided on one of the two ends in the area of a U-flange (5). An independent claim is included for a method for manufacturing a coupling piece.