Tilt-and-Slide Sash Fitting with Dynamic Damper for Noise Reduction
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Solution Overview
Problem
Existing fitting arrangements for tilting and sliding sashes have limited opening widths and fragile guidance, making handling and closure inefficient, especially when closing.
Innovation Solution
A fitting with a stay-open scissor stay and a linear damper that unlocks the locking mechanism during closure, allowing the sash to pivot from a parallel parked position to a closed position, reducing impact noise and enabling larger opening widths by acting as a flexible stop, and is designed to brake the opening movement to prevent hard impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed stop is used to unlock the latching mechanism, then the structure is simple, but the impact noise during unlocking is high and the opening width is limited
Solution Approach 1:
The patent replaces the fixed stop with a dynamic damper that can move and absorb impacts. The damper is connected to the scissor stay and can compress during the unlocking process, transforming the rigid fixed stop into a flexible, motion-absorbing component that reduces impact noise while maintaining structural functionality.
Solution Approach 2:
The damper is positioned and pre-configured to absorb the impact before the scissor stay fully extends during the unlocking process. This beforehand cushioning prevents the hard impact that would occur with a fixed stop, reducing noise and protecting the latching mechanism from shock loads.
2Adaptability or versatility
If a fixed stop is used, then the structure is simple, but the opening width during tilting is limited
Solution Approach 1:
The damper replaces the rigid fixed stop with a dynamic component that can extend and compress. This allows the scissor stay to travel further during the tilting operation, increasing the maximum opening width while the damper absorbs the varying forces throughout the range of motion.
Solution Approach 2:
The patent changes the physical state and properties of the stop mechanism from a rigid, fixed position to a flexible, variable-position damper. The damper's compression and extension capabilities allow for greater displacement and larger opening widths while maintaining control over the motion.
3Reliability
If the scissor stay is rigid, then the guidance is simple, but the guidance is fragile and prone to damage during closing
Solution Approach 1:
The damper is positioned to absorb impacts before they reach the scissor stay guidance system during the closing operation. This beforehand cushioning protects the fragile guidance components from damage while allowing the rigid scissor stay to maintain its structural integrity.
Solution Approach 2:
The damper acts as an intermediary element between the scissor stay and the fixed stop. It mediates the interaction by absorbing shocks and smoothing out the forces during closing, protecting the guidance system from direct impact loads that would cause damage.
4Force
If the damper stroke is short, then the structure is compact, but the damping forces are insufficient over the required distance
Solution Approach 1:
The patent employs multiple linear dampers arranged in parallel or series configurations to achieve the required total damping force and stroke length. By distributing the damping function across multiple components, the system achieves sufficient force and displacement control without requiring a single excessively large damper.
Solution Approach 2:
The damping function is segmented into multiple linear dampers that work together. Each damper contributes to the overall damping force and stroke, allowing the system to achieve the required performance parameters through coordinated action of multiple smaller components rather than a single large damper.
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 enhances handling by allowing larger opening widths and optimized movement during closure, reducing noise and improving the durability of the guidance system by using a damper as a flexible stop and unlocking mechanism.
Implementation Method 1
at least one damper is provided which unlocks the locking mechanism during a closing movement of the sash
Implementation Method 2
The linear dampers can be in the form of fluid dampers or gas dampers
Implementation Method 3
The damper with one or more linear dampers is preferably pretensioned in the extended position via an energy accumulator
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A fitting for a tilt-and-slide sash (4) comprises at least one tilt-and-slide sash (20) with two pivotally connected arms (21, 22), wherein the at least one tilt-and-slide sash (20) is movably held on one side on a guide rail (3) and is connected to a sash (4) on the opposite side, wherein the at least one tilt-and-slide sash (20) can be locked in an opened position of the sash (4) by means of a locking mechanism (27), and the sash can be moved along the guide rail (3) in the locked position, wherein at least one damper (30) is provided by which the locking mechanism (26, 27) can be unlocked during a closing movement of the sash (4). The invention further relates to a method for opening and closing a sash that can be tilted in a parallel position.