Window Fitting Control Pin Assembly for Standard Through-Holes
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Solution Overview
Problem
The challenge of mounting a bearing-supported control pin in a window or door with limited through-hole diameter and standardized dimensions, as the outer diameter of the bearing exceeds the through-hole diameter, is addressed.
Innovation Solution
A fitting arrangement with a control pin secured by a counter element using a frictional connection or slot nut, allowing tool-free mounting and ensuring a secure, rivet-free connection to the drive bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing-supported control pin is used to handle high leaf weights, then the operational reliability and load-bearing capacity are improved, but the outer diameter of the control pin exceeds the standardized through-hole diameter, making it impossible to insert from one side
Solution Approach 1:
The control pin is divided into two separate components: a first control pin portion that fits through the standardized through-hole, and a second control pin portion that forms the bearing support. This segmentation allows the first portion to be inserted through the limited-diameter hole while the second portion provides the necessary bearing support for high leaf weights, resolving the contradiction between reliability and ease of mounting.
Solution Approach 2:
The second control pin portion (bearing support) is nested within or attached to the first control pin portion. The first control pin portion is inserted through the through-hole, and the second portion is then positioned to provide bearing support. This nesting approach allows the bearing-supported control pin to be assembled through a standardized hole without requiring the entire control pin to have a large diameter.
2Ease of manufacture
If the diameter of the through-hole is standardized and the width of the drive bar is limited, then the manufacturing simplicity and standardization are improved, but the diameter of the control pin cannot be made large enough to accommodate a bearing
Solution Approach 1:
The control pin is segmented into a first portion for passing through the standardized hole and a second portion for providing bearing support. This allows the through-hole to remain standardized and small in diameter while the bearing support portion can be adequately sized to handle high leaf weights, thus maintaining manufacturing simplicity while achieving reliable load-bearing capacity.
Solution Approach 2:
The first control pin portion acts as an intermediary element that bridges the standardized through-hole and the bearing support function. It allows the bearing-supported control pin configuration to be achieved without changing the standardized hole dimensions, thereby maintaining ease of manufacture while enabling reliable load-bearing capacity through the bearing support portion.
3Strength
If a traditional screw connection or rivet is used to secure the control pin, then the connection strength is improved, but the assembly complexity and time are increased
Solution Approach 1:
The control pin design allows for tool-free assembly where the first control pin portion is inserted through the through-hole and the second control pin portion (bearing support) is positioned and secured without requiring external tools. The bearing support portion may be secured by friction fit, interference fit, or integration with the drive bar, eliminating the need for screws or rivets and thus reducing assembly complexity while maintaining connection strength.
Solution Approach 2:
The bearing support function and the control pin function are merged into a single integrated assembly where the first and second control pin portions work together as one unit. This merging eliminates the need for separate fastening elements like screws or rivets, reducing assembly complexity while maintaining the connection strength needed for high leaf weights.
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
Facilitates easy and secure assembly of the control pin, reducing operating torque and enhancing customer satisfaction through improved operational comfort.
Implementation Method 1
can be mounted on the control pin by means of a, in particular axial, frictional connection
Implementation Method 2
can be engaged from behind by a slot nut
Data Source
AI summary
A fitting arrangement for a window or a door has a drive bar with a through-hole. A control pin and/or a counter element of the fitting arrangement is/are passed through the through-hole and connected to one another such that the control pin is captively retained on the drive bar. The control pin is preferably connected to the counter element without the use of tools. Particularly preferably, a spring element is provided which latches the control pin by pressing the control pin and the counter element axially together. The spring element can be designed in the form of a circlip which, in the not yet assembled state, is arranged on the control pin or the counter element.