jack shaft door closeing

[kbs2244]

I have a question on the jack shaft type openers.
How do they close the door tight?

On a standard track type opener the door it is pushed closed against the spring pressure.
How does a jack shaft type do this?

Just turning the shaft backwards will give you slack in the cables but no positive down force.

I have done some video watching and install book reading and have not seen any type of cable hook up to pull the door down.

Do you just adjust the springs to have the door heavy?

 

[csp]

How does a door with no opener close tightly?

If it's adjusted correctly it shouldn't need anything to push it outward.

 

[upndown]

If your springs are not sized and adjusted correctly as well as your tracks, good luck opening and closing wit any opener. You shouldn't have to stand on it to close or bust your balls to open.

 

[Autorotica]

My builder adjusted the doors so when you release the lock and give the door a lift, it opens full height pretty much all on its own. It doesnt go crazy fast, but it will go full open. You have to pull the door down pretty decisively to get it to close...

Chris

 

[kbs2244]

I have always gone by the rule that a properly set spring will hold the door at waist level when brought up or down to that point.
The lift and lower forces are balanced and it need "help" to go either way.
The only way I can see that a wall mount will close tight by just giving slack to the cable is to adjust for a "heavy door" affect.

 

[JCByrd24]

The door is heavy enough so yes it's just slacking the spring force to allow the weight of the door to close it. It works fine. I'm not positive but I would guess a traditional opener is actually doing just the same.

 

[pmilin]

I have several of these type openers on single width doors. I didn't have to change a thing when I installed them. They had traditional openers on them. The weight of the door is enough to close it tightly. The openers I used also have a locking mechanism so that someone cannot just walk up to it and overcome the opener to open the door manually.

 

[DeliveryGuy]

As the machine turns the shaft backwards, non counterbalanced weight squeezes the door down. Your single wide door can weight over 150lbs. Properly counterbalanced, it appears to weigh nothing. Every bit the machine forces the spring back, the more gravity squeezes the door tight.