Constant Force Spring Mounting

A constant force spring is usually mounted by first tightly wrapping it on a drum then attaching the free end to the loading force such as in a counterbalance application.

Constant force spring mounting.

Compact and tightly coiled these springs extend to multiple times their length to pull objects in a linear direction. Pulley mounting doubles the force of a single constant force spring but reduces the cycle life. A life cycle is an extension and retraction of either the whole spring or any portion of it. As the constant force spring deflects potential energy is stored in the extended unwound section.

If the spring had reached its fatigue point or if the load is suddenly. There are several mounting methods all of which will impact the design of your mechanical spring. Mounting a constant force spring on a spool. Tandem mounting makes the sum of two spring forces available at a single point but does not add stability.

The drum diameter should be 10 to 20 larger than its natural inside diameter. Sunbank is a world leader in designing and manufacturing ba. For technical drawings and 3 d models click on. It can be placed in a cavity or on an undersized bushing or pin.

Laminar mounting inter winding of two or more springs as an assembly offers the sum of their forces in a minimum of space. Common mounting methods are detailed below. Follow this tutorial which shows you how to install sunbank constant force spring on a backshell. For starters the spring doesn t have to be mounted on a spool.

Constant force spring mounting bracket misumi of misumi check out the variety of configurable constant force spring mounting bracket misumi of misumi misumi has other mechanical components press die and plastic mold products available. Guide to mounting constant force springs. Please allow for 1 1 2 coils on the shaft at full extension to hold the spring in place. The life of the constant force spring is predictable.

A high estimate which makes the spring larger and more expensive than necessary. Posted by vulcan spring. Misumi offers free cad download short lead times competitive pricing and no minimum order quantity. Constant force springs offer unique types of mounting styles due to their gear pulley like rotation and interaction.

Material will certainly affect the design as well as cost. This relationship can also be reversed. Depending on your product you will likely need to be able to mount your constant force spring. A low estimate of cycle life will lead to early failure.

We can help you determine which mounting method is best based on your application.