Locking Bolt Axial Guide for Espagnolette Fitting
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Solution Overview
Problem
Existing locking pins for window or door connecting rod fittings face issues with non-adjustable mushroom roller height, leading to tolerance problems, and press fits that can become loose under radial forces.
Innovation Solution
A locking pin design featuring a fixing element held in an axial guide between the head and foot parts, allowing for adjustable axial position of the head part while maintaining a permanently fixed height, with a frictional connection and spring-elastic prestressing for secure retention and easy rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snap ring is used to positively lock the mushroom roller on the mushroom pin, then the axial position is fixed, but the height of the mushroom roller is not adjustable and tolerances cannot be compensated
Solution Approach 1:
The fixing element is designed to be movable along the axial guide, transitioning from a static fixed position to a dynamic adjustable position. This allows the head part's height to be adjusted axially relative to the foot part while maintaining reliable fixation through the guide's constraints.
Solution Approach 2:
The locking pin is divided into separate functional components: the foot part, the head part, and the fixing element that moves between them. The axial guide segments the movement freedom, allowing adjustment in the axial direction while preventing radial displacement, thus resolving the contradiction between adjustability and position fixation.
2Adaptability or versatility
If a transition or press fit is used between the head part and foot part, then the height can be adjusted axially, but the connection becomes loose under radial forces
Solution Approach 1:
The fixing element acts as an intermediary between the head part and foot part. It provides the necessary connection stability through the axial guide while allowing axial adjustment. The guide itself serves as a mediator that constrains radial movement but permits axial motion, preventing the loosening issue of direct press fits.
Solution Approach 2:
The solution moves the adjustment freedom to a different dimension - the axial direction - while maintaining radial constraint through the guide. This dimensional separation allows axial height adjustment without compromising radial connection stability, resolving the contradiction between adjustability and reliability.
3Reliability
If the fixing element is held in an axially arranged guide with frictional connection, then the head part can be adjusted axially and the position permanently fixed, but the device complexity increases
Solution Approach 1:
The axial guide serves multiple functions simultaneously: it provides the frictional connection for adjustable positioning, acts as a constraint against radial forces, and guides the fixing element's movement. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving reliable permanent fixation.
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
Ensures reliable and permanent axial positioning of the head part relative to the foot part, preventing loose press fits and allowing for easy operation of the espagnolette fitting with reduced friction, enhancing stability and convenience.
Implementation Method 1
This design enables the fixing element to have a frictional connection in the axial guide. The head part can thus be adjusted in the axial direction in relation to the foot part.
Implementation Method 2
the fixing element is designed to be spring-elastic. The prestressing of the fixing element against the axial groove is particularly simple if the fixing element is designed to be spring-elastic.
Data Source
Figure 1~4
Figure 5~6
Figure 7~8
AI summary
A locking bolt (6) for a lock (3) of a window espagnolette (4) has a fixing element (21) for axially holding and radially supporting a head (12) on a foot (11). The fixing element (21) is arranged in a guide (22) of the head (12) and bears against sliding surfaces (19, 20) of the foot (11). The locking bolt (6) enables particularly convenient operation of the espagnolette (4).