Adjustable Terminal Piece for Door Frames with Eccentric Pin
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing terminal pieces for door and window frames fail to maintain precise and reliable adjustment under conditions of overloading, such as accidental impacts or strong winds, due to relative movement between the catch and slider caused by frictional forces.
Innovation Solution
A terminal piece with a slider and catch connected via a first pin element for rotation and a second pin element with an eccentric portion, providing irreversible adjustment through riveting, ensuring the catch's position is fixed relative to the slider, enhancing rigidity and preventing movement during overloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If friction-based blocking is used to adjust the catch position, then the device complexity is reduced, but the reliability deteriorates under overloading conditions
Solution Approach 1:
The adjustment mechanism is divided into two independent pin elements: the first pin element (46) provides rotation capability while the second pin element (48) with eccentric portion provides both adjustment and rigid blocking. This segmentation allows each component to specialize in one function, achieving reliable positioning without excessive complexity.
Solution Approach 2:
The second pin element with eccentric portion acts as an intermediary between the slider and catch, providing a rigid mechanical connection that prevents relative movement under overload while still allowing adjustment through controlled rotation. This intermediary element transfers and stabilizes the positional relationship.
2Ease of operation
If the catch is allowed to oscillate during adjustment, then the ease of operation is improved, but the manufacturing precision deteriorates due to positioning uncertainty
Solution Approach 1:
The eccentric portion of the second pin element is designed to automatically guide the catch into its final precise position as rotation approaches the blocking point. The geometry of the eccentric portion ensures that the last portion of rotation naturally settles the catch at the exact desired position, eliminating positioning uncertainty.
Solution Approach 2:
The manual friction-based blocking system is replaced with a mechanical eccentric cam mechanism that automatically achieves precise positioning through its geometric design. The eccentric portion's shape converts rotational motion into precise linear positioning without relying on friction or operator skill.
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 maintains precise adjustment and increases the terminal piece's rigidity, as demonstrated by loading tests showing reduced residual displacement and lack of yielding, even under high forces like 1.4 kN, ensuring reliable operation.
Implementation Method 1
the second pin element is able to turn with respect to the slider and comprises an eccentric portion, designed to govern said movement of rotation of the catch
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Terminal piece for closure rods for door and window frames comprising: a slider (22); a catch (24); and means of connection and adjustment arranged between the slider (22) and the catch (24) and designed to enable adjustment of the position of the catch (24) with respect to the slider (22). The means of connection and adjustment comprise a first pin element and a second pin element (46, 48), wherein the first pin element (46) defines an axis of rotation, about which the catch (24) can perform movements of rotation, and in which the second pin element (48) is able to turn with respect to the slider (22) and comprises an eccentric portion (48"), designed to govern said movement of rotation of the catch (24). The first and second pin elements (46, 48) are connected in a permanent and not removable way to the slider (22) and to the catch (24) and provide a fixing of the catch (24) with respect to the slider (22) in the direction of the respective axes.