They are ideal when security is essential where noise or temperature control might be an issue where you need a minimal internal or external projection and.
Counter weight door system.
An overhead door system employs counterweights which operate through cables connected to a drum which tapers from one end to the other so that the effective force acting on the door in the opening direction is reduced as the proportion of the weight of the door to be supported reduces.
I hope it will be helpful to anyone who wants to make an automatic door closer with this design using sheaves and internal counterweight.
The system is adjustable readily to accommodate different types of doors having different opening.
As the scenery and equipment loads are varied the amount of counterbalance is adjusted on the weight carriage so that the system can be raised and lowered with a minimum amount of effort.
Welcome to my first instructable.
I d like to apologize for any grammar or english errors becau.
A counterweight is a weight that by exerting an opposite force provides balance and stability of a mechanical system.
A theatrical counterweight system provides a simple mechanical method of raising and lowering various balanced loads by a system of pulleys and weight carriages.
In these applications the expected load multiplied by the distance.
Counterweights are often used in traction lifts elevators cranes and funfair rides.
This allows for smooth operation of large heavy doors and an unlimited cycle life.