Thrust Compensation Kit for Lift-and-Slide Window Sash
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Solution Overview
Problem
Lift-and-slide windows or doors with heavy sashes face difficulties in smooth operation due to weight, leading to hazardous uncontrolled handle rotation and potential damage during lifting and lowering, and existing solutions like springs are cumbersome to install and distribute loads ineffectively.
Innovation Solution
A thrust compensation kit with a fixing bracket, containment body, elastic contrasting means, and thrust body is installed between the carriages, allowing for balanced load distribution and easy installation, using a containment body to house the connection bar and elastic means, and a thrust body to assist lifting and resist lowering, ensuring controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is fitted to the connection bar to control lifting or lowering movement, then the spring extends to thrust the sash upwards helping lifting and compresses to oppose lowering, but the mounting is difficult and loads are not distributed optimally
Solution Approach 1:
The thrust compensation device is divided into separate functional components: a containment body housing the spring, a thrust body that transmits force to the carriage, and a fixing bracket for mounting. This segmentation allows each component to be manufactured and assembled independently, simplifying the overall mounting process while maintaining reliable control functionality.
2Ease of manufacture
If the spring is installed at the end of the carriages, then the loads arising from the weight of the sash are not distributed in an optimum manner, but this position allows spring installation
Solution Approach 1:
The thrust body acts as an intermediary component between the spring and the carriage. It transmits the elastic force from the spring to the carriage in a controlled manner, enabling optimal load distribution while maintaining ease of installation. The intermediary structure allows the spring to be positioned effectively without directly mounting it at the carriage end.
3Ease of operation
If the sash has considerable dimensions and weight, then the weight makes rotation of the handle difficult during lifting, but the sash can be opened
Solution Approach 1:
The elastic contrasting means (spring) provides an upward thrust force that counteracts the weight of the heavy sash during lifting operations. This counterbalancing force reduces the effort required to rotate the handle, making operation feasible even with considerable sash weight.
4Ease of operation
If the sash has considerable weight, then the weight contributes to sudden and violent undesired rotation of the handle during lowering, but the sash can be closed
Solution Approach 1:
The elastic contrasting means is pre-loaded to provide a counterbalancing force that opposes the downward movement of the sash during closing. This preliminary anti-action prevents the sudden and violent handle rotation that would otherwise occur due to the sash weight, ensuring controlled lowering operation.
5Reliability
If an uncontrolled lowering occurs, then the handle rotation is hazardous for the user, but the sash can be lowered
Solution Approach 1:
The elastic contrasting means is pre-positioned and pre-loaded to provide cushioning force before the sash begins to lower. This beforehand cushioning ensures that the lowering process is controlled and prevents hazardous uncontrolled handle rotation, protecting user safety while maintaining operational capability.
6Reliability
If an uncontrolled lowering occurs, then damage can be done to the sash and hardware components, but the sash can be lowered
Solution Approach 1:
The elastic contrasting means provides beforehand cushioning during the lowering process, absorbing and controlling the forces that would otherwise cause damage to the sash and hardware components. This protective action occurs before damage can occur, ensuring component integrity while maintaining functional lowering capability.
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 kit facilitates safe, easy, and controlled movement of heavy windows or doors, preventing sudden handle rotations and damage, while being easy to install and retrofit, with balanced load distribution and extended component life.
Implementation Method 1
an elastic contrasting means (30) housed in the containment body (20) and fittable, in use, around the connection bar (200) so as to be compressible or extendible along a prevalent direction of extension (X) of the containment body (20)
Data Source
Figure 1
Figure 2A
Figure 2B~2C
AI summary
A thrust compensation kit (100) for a sash (A) of a lift-and-slide window or door comprising a fixing bracket (10) that is stably applicable in a receiving seat (S) obtained on a lower cross member (T) of the sash (A) and having an abutment projection (11). The kit (100) further comprises a containment body (20) that is insertable within the receiving seat (S) and has a first end (20a) configured to come to abut with said abutment projection (11) and a second end (20b), opposite the first end (20a) and having an access opening. The kit (100) further comprises an elastic contrasting means (30) extending in the containment body (20) and compressible or extendible along the prevalent direction of extension (X). The kit (100) further comprises a thrust body (40) that is at least partially housed slidingly inside said containment body (20) and is slidable between a retracted position and an extracted position.