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[R.U. Sirius]

I am refurbishing what seems to be a Lortone Beaver, and noticed this small metal plate (a stack of two plates, actually) welded to the bottom in the back.

I guess it had something to do with mounting the motor, but have no idea how exactly (and how well) it works, as this came without a motor.

Unless there is some ingenious way of using this to mount a motor cradle in the back, I was planning on drilling holes and bolting the motor cradle base to the back of the unit. Is this a good idea?

[irockhound]

Not familiar with that unit however the only thing that would stick out to me for it's purpose is the reinforcement for the tension adjusting screws on the motor plate like you said.  An image from the front side of a beaver shows the motor in that location.  It also looks from a 2nd picture that it had a plate extending from underneath the unit that the motor was hung from and then that bracket was used to push the motor away from the unit with thumb screws tightening the belt.  On the underside of the of the unit do you see mounting holes or they could have been in the base board of the unit?  The 2nd picture is a newer model of the unit obviously.

I finally found a top view showing the motors plate with sliding grooves and then that plate would indeed be the push plate for tension.  Picture 3

[R.U. Sirius]

Found instruction manuals on Lortone website, and it looks like the motor mount slides over this plate, as in the drawing below.

I also found some old ebay listings where this motor mount seems to be at a significantly lower angle than the ~50 degree angle shown in the drawing.

I think I'll try to build something similar out of steel and hope for the best...! It doesn't look like there is anything going on on the underside of the unit, just this angle bracket sliding over the plate in the back.

[irockhound]

Ah okay so that 2nd pic i found was more accurate with the angle and the last pic from top just looked flat from the angle of the pic.  Good thing you have it all figured out then.