Window Sash Lifting Device with Pulley Mechanism
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Solution Overview
Problem
The existing methods for installing window sashes are labor-intensive and require significant physical effort, often necessitating multiple workers due to the weight and size of modern window sashes, posing health risks and potential damage to the product and environment, while also being inefficient and costly.
Innovation Solution
A window sash lifting device that allows a single fitter to efficiently transport and mount window sashes using a system with wheels, a parking brake, an electric drive unit, and adjustable components, enabling easy manual operation and tilting, with a support profile for varying weights and designs, allowing for safe and efficient installation without extensive physical effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual installation methods are used for heavy window sashes, then installation can be performed with simple equipment, but the physical effort required increases significantly and health risks arise
Solution Approach 1:
The lifting device is divided into modular components: a frame structure, a lifting mechanism with pulley system, and adjustable support elements. This segmentation allows the system to handle heavy window sashes through distributed mechanical advantage while maintaining operational simplicity.
Solution Approach 2:
The lifting device acts as an intermediary mechanism between the installer and the heavy window sash. The pulley-based lifting mechanism transfers and amplifies the installer's input force, reducing the physical effort needed to lift and position heavy sashes safely.
2Reliability
If multiple workers are used to install heavy window sashes, then the safety and stability improve, but the installation time and labor costs increase
Solution Approach 1:
The lifting mechanism incorporates mechanical advantage through pulleys and levers that counterbalance the weight of the window sash. This allows a single operator to safely control and position heavy sashes, maintaining installation safety while eliminating the need for multiple workers.
Solution Approach 2:
The device enables self-service installation where one worker can independently lift, position, and secure the window sash using the mechanical lifting system, eliminating the need for additional helpers and thereby improving productivity without compromising safety.
3Device complexity
If traditional transport carts are used to carry window sashes, then the transport function is simple, but lifting the sashes into position requires considerable effort
Solution Approach 1:
The device merges the transport cart function with the lifting mechanism into a single integrated system. The frame structure serves both as the transport platform and as the support for the lifting mechanism, eliminating the need for separate transport and lifting equipment while reducing lifting effort.
4Device complexity
If fixed-height lifting devices are used, then the device structure is simple, but they cannot adapt to different window sash positions and obstacles
Solution Approach 1:
The lifting device incorporates adjustable and movable components, including height-adjustable support legs and a tiltable frame structure. These dynamic elements allow the device to adapt to various window sash positions and overcome obstacles like cables and strips while maintaining relatively simple device structure.
Data Source
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AI summary
The invention relates to a mobile window sash lifting device, particularly for transporting window sashes (F) within a building and installing them in window frames. The installer can move the window sash lifting device with the window sash towards the window frame by hand and without significant effort. Subsequently, using the lifting system (4, 10), the installer can raise the window sash to the correct installation height and, by rotating and tilting the window sash lifting device, bring the window sash into the insertion position against the window frame. The installer can then manually connect the hinges and pins of the window sash to the corresponding hinges and pins of the window frame without requiring any force.