Mounting a Branick 7200

[Rusty67]

OK so I did a little searching around and I also read the Branick manual for the 7200. The manual say use 3/8" bolts to mount the assembly. I have 2 questions. How long should the 3/8" lag bolts or carriage bolt be if I'm going to mount them into wood and how large of a piece of wood do I need to mount this to? I guess what I really need to know is, are 2x4s sufficient for this beast or do I need to step up to a larger piece of wood like a 4x6? The 7200 has 3 pairs of holes running vertically on each side the flange so I was thinking of running 3 pieces of wood across the studs horizontally in line with the pairs of holes and then mounting the 7200 to those pieces of wood. Am I good with the existing 2x4 studs in the wall or should I sister 4x6 studs in the frame to the 2x4s and mount to the larger 4x6 studs? Normally I don't think twice about mounting cabinets and such to the wall but this 7200 is much heavier than I thought it would be and its going to be dealing with all the force of coil springs so I want to make sure I'm absolutely safe when mounting and using this beast.

As I'm typing this I'm wondering if this is overkill but I'm no structural engineer and I'm not sure how much length on the lag bolts I'll need to connect the horizontal pieces of wood to the existing 2x4 studs.

And now I'm wondering if I should just pop a pair of 4x6 studs from the base plate to the top plate and mount directly to those? I'm making this way too complicated aren't I?

 

[kbuhagiar]

For those of us with no clue:

https://www.branick.com/wp-content/uploads/2019/03/81-0020B.pdf

 

[Beerhippie]

For those of us with no clue:

https://www.branick.com/wp-content/uploads/2019/03/81-0020B.pdf

Thank you--I now have a clue.

 

[Buckaroo5]

I think the frame carries almost all the stress so I would say you should be good with your plan to mount it to horizontal 2x4's across the studs. I would use structural screws.

I have been looking for a used Branick. How does the 7200 compare to the 7400 & 7600?

 

[signcrafter]

I bought a 7400 last year and when I mounted it temporarily for now I just screwed a couple 2x6s horizontally to a couple wall studs and then mounted the 7400 to them with some lags. It is a heavy thing so needs decent support. I'm not an engineer but don't think the force of the spring really comes into play as far as mounting it, the machine contains that force and doesn't really transfer any of it to the wall. I'm eventually moving mine but will probably mount it the same way, again I'm not an engineer but to me a 2x6 mounted to the front of the wall studs seems stronger then mounting it between the studs and I don't mind the looks of the 2x6 on the outside of the wall.

 

[WhoWhatNow]

They sell a flimsy looking stand on wheels for them so I agree that the frame handles all the stress of the spring. As long it doesn’t fall off the wall when the strut is mounted you should be good.

 

[Rusty67]

Did you just use like say 1.5" or 2" long 3/8" lag bolts to mount the Branick the 2x6 boards? I probably was overthinking this, you guys are probably right, the amount of stress on the wall is probably not much more than the dead hanging weight of the unit even when using it.