Block And Tackle Vs Constant Force Window Balance

The arrangement of the pulleys and cord provide a 5 1 travel characteristic. Block and tackle balances are used on wood fiberglass and composite windows while constant force balances are more common on vinyl windows. The three most commonly used replacement window balance systems are the spiral balance the coil balance and the self tensioning block and tackle balance.

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Block And Tackle Vs Constant Force Window Balances

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This means that the sash can travel 5 times the total spring extension.

Block and tackle vs constant force window balance.

What is the best window balance system. When you open or close the window some tension is applied by turning the spiral rod that extends out from the bottom of the tube counter clockwise spiral balance system was widely used in replacement windows. Spiral balance spiral balances were initially very popular in wood and metal windows and migrated to some of the earliest replacement thermal pane window systems. Drawbacks of constant force window balances.

In addition as the cord or tackle is pulled by the movement of the sash it st. The pulleys are grouped as the block to reduce the load the homeowner feels. Marvin windows which are the most expensive come with a block and tackle which can handle alot of weight. Back to table of contents.

Lately most window manufacturers switched to constant force or block and tackle. Both systems can be installed on hung window frames made of all materials the last statement is just an observation from the products we have direct experience with. Constant force vs block and tackle 11 post by prosteelheader fri jan 22 2010 1 22 am block and tackle is a lot quieter. Easy to replace the balance.

Constant force balances tend to be noisy as the coils are stretched and retracted on the rollers that are inside their keepers. Block and tackle are more expensive for a company to stock and that is one of the main reasons companies opt to use constant force. Constant force balances are the newest type of balance and currently both constant force and block and tackle systems are popular choices for window manufacturers. Benefits of block and tackle window balances.

Currently one of the most common window balances block and tackle window balance systems includes a combination of two or more pulleys a cord and a spring. Window units with this system leave wiggle room for the sash so the seal is not as tight compared to windows with other. Spiral balance system the spiral balance relies on tension applied to spiral rod inside a balance tube. Can handle heavy window sashes.

Our choice for best window balance is the constant force window balance. Block and tackle balances use extension spring force to counterbalance the weight of a window sash. Pros and cons of block and tackle window balances. That said a constant force is still a good balance system.

When the spring is fully extended like it would be in a closed lower sash the spring force.