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Deactivated Dorma 75 v & BTS 80's

9/8/2019

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In this blog entry I would like to share some videos and link to a linkedin post of a video I made showing how I disabled a Dorma 75 v and Dorma BTS 80's. As can be seen in the video I show a Dorma 75 v with a Briton pin and strap freely spinning after I uncoupled it from the floor springs mechanism plus BTS 80's doing the same.

https://www.linkedin.com/posts/rod-fathers-84b1b0ba_fitters-floor-door-activity-6576321427283156992-C4rm

The calculation data for this conversion is as follows:

Basic dynamic load rating C 8.5 kN

Basic static load rating 
C0 26 kN

Fatigue load limit P
ᵤ 3 kN

MFS has found by far our tried and tested service/solution (5 years with no problem) to be the best way of dealing with the associated problems surrounding an existing installation prior to the fitting of any over-head disabled door opener all things considered (including cost, durability, ease, down-time, is  environmentally friendly and is reversible. Inquiries are most welcome through our contact page. Training and possible franchising may be available.
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    As there is so little information out there with regard to door closers, especially vintage and antique model floor springs, I thought I would start this blog.

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