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What is a Window Lift Support?

Lift supports in a window, often referred to as a gas strut, gas spring, or Constant Force, etc., is a mechanical device designed to assist in opening, closing, and holding a window in place. These supports use the force of compressed gas contained within a cylinder to create a controlled and smooth motion, reducing the effort required to lift or lower the window preventing it from slamming shut.

Types of Lift Supports for Windows

  1. Gas Struts / Gas Springs:


Standard Gas Struts: These are the most common type of lift support, used in a variety of applications, including windows. They provide a smooth opening and closing motion and can hold the window open at a desired position.


Locking Gas Struts: These struts can lock in any position along the stroke. They are useful for applications where the window needs to be held at various open positions.


2. Friction Stays:


These are hinge-like devices that control the opening of casement windows. They provide a degree of friction to hold the window in place at different angles without the need for a separate locking mechanism.


3. Spring Hinges:


Similar to gas struts but using a mechanical spring rather than gas pressure. These are simpler but less common in modern windows due to the superior performance of gas struts.


4. Hydraulic Supports:


Less common in window applications, hydraulic supports provide smooth and controlled motion using fluid pressure. They are typically used in situations requiring very controlled, slow movement.


5. Constant Force Springs: (These are what our windows utilize)


These provide a constant force over their range of motion, making them useful for balancing the weight of the window sash. They are often found in double-hung window balances.


Selection Criteria for Lift Supports

  • Load Capacity: The support must be able to handle the weight of the window sash.

  • Length and Stroke: The size of the support when compressed and extended must fit within the window frame and provide the desired range of motion.

  • Mounting Options: The support must have compatible mounting brackets or end fittings to attach to the window and frame.

  • Damping Characteristics: Some applications may require supports with built-in damping to slow the motion and prevent slamming.

  • Environmental Conditions: Consideration for temperature and weather exposure, especially for exterior windows.


Choosing the right type of lift support depends on the specific requirements of the window, including size, weight, desired motion control, and environmental factors.



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