New life for tired vintage hoses!
"why can't the inside of a vacuum cleaner hose be lined with latex rubber?"
Oh, but it can be done, Alex. I applied myself to this problem a few years back and developed an easy-ish process to re-line any cloth or rayon'saran braided hose with success.
If you examine a cut apart section of vintage woven hoses you can see the contruction layers most Manufacturers used. Inner core is black rubber impregnated tape spiral wound before the wire coil is laid over it. Then there is a layer of thicker rubber tubing and finally the decorative woven surface bonded to the rubber tube. The only adhesives used are thin liquid rubber sprays to retain maximum flexibility.
Hose stock of infinite length are possible this way as is comes off the shaping mandrel and I lament that so many manufacturers chose to save a few pennies rather than produce longer hoses of 8 & 9 feet. Air-way and Filter Queen made admirably longer hoses, for instance.
As you know, Electrolux made their early hoses with a tapered diameter from intake coupler to handle end to help keep large objects from entering the hose proper. If it won't pass through the wand handle it cannot clog the hose length and makes removal of the offending clog an easy matter with forceps or a long wood pole.
The ingenious 'knitting' machine that weaves the continuous outer braiding is a variation of that used to create cloth power cords, braided brake lines and motor stator, field coils, commutator and transformer windings. It is capable of creating the chevron patterns in the visible weave that is so familiar and striking in a vintage woven hose.
My methodology is not meant to turn an old hose into a heavy duty Daily Driver (tho my experience is that you could) but rather to restore the original suction of a cherished vacuum's hose so that any one of mine can be plucked from the display shelf and demonstrated/used at the peak efficiency originally intended at mini-meets, for my own productive amusement...or winning vacuum contests at Conventions.
It's written up in the archives several times but I can't seem search it out right now.
There's a fair amount of careful preparation and exquisite timing involved but basically, 30 minutes work and a 60 minutes curing using the hot exhaust from vacuum then dusting with talcum powder totally reseals a woven hose to like new suction.
Liquid latex begins to thicken and cure on contact with the open air so technique speed is a major and controllable factor. The close confines of the hose interior slows down the cure reaction and I use this property to continue to blow latex through the hose weave under hot exhaust pressure preventing gravity from allowing the remaining latex fluid to pool. The talcum powder addresses the tendency of even cured latex to remain sticky to those first blasts of micro dust. Overnight curing finalizes the bond. Does not work on solid vinyl wrapped coil hoses. Remove as much of the coupler and handle fittings as possible (you don't want the hassles of coating the metal tubing then peeling it away). It's just the flexible portion of the hose material you want to coat so I will wipe just the inside metal collars with Vaseline or line with masking tape for easy release in those areas so that the cured latex has no chance to curl up and glob the openings. Again the timing to know when to do that cleanup peel comes from experience (at least an hour - no more than 3). Leave it too long and the latex will roll back & ball up in that joint area and defeat all your careful work. Later you can paint and smooth out the joint with an artists brush dipped in liquid latex. But this must be done before any talcum powder is layered in.
It will leave barely noticeable clear latex stains on a cloth hose but on saran woven hoses the outer excess bleed simply wipes off after curing. My method blows the milky liquid latex through the weave of the hose locking the layers together and coating the internal diameter without reducing the diameter, clumping or clogging.
I have done this to all my older Lux hoses and many others, from Air-Way to Eureka to lesser brands.
This would make a terrific illustrated article for the Bulletin if someone gives me a kick in the butt. Definitely I will give serious thought to bringing my materials to Milwaukee for a workshop. It's time devoted collectors saw this in person...
Dave
Just found an instance - scroll down to post #9.[this post was last edited: 1/16/2013-19:01]
http://www.vacuumland.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?8695