or friction shock absorbers

Friction dampers are incorporated at the bottom of the rear of the special Feridax Dualseat,

Oil-impregnated porous-bronze bushes and side-thrust washers are used in the new front forks.
The front forks are of link- or girder-type, but redesigned with the object of providing forks which will operate efficiently over thousands of miles without attention, even lubrication. They have Nitralloy spindles working in porous bronze, oil-impregnated bushes. Side-thrust washers at the top links are also of this oil-retaining bronze. An anti-rattle mounting in the form of a compressed rubber bushing is provided for the knob of the steering damper, which can therefore be left right "off" without any clatter occurring. Another improvement is a Bakelite knob for adjusting the friction dampers incorporated in the bottom links.

http://www.dropbears.com/m/models/classic/vincent.htm

Friction shock absorber:
A shock absorber in which friction discs are inserted at the point where the two arms are joined, now no longer used
http://www.motorera.com/dictionary/FR.HTM#FrictionShockAbsor...

Moto Guzzi Nuovo Falcone
The Falcone's rear suspension of under-engine springs and friction dampers between the swinging arm and seat rails was replaced by a conventional






--------------------------------------------------
Note added at 11 mins (2007-12-20 10:00:03 GMT)
--------------------------------------------------

http://www.google.com/search?hl=en&client=firefox-a&rls=org....

--------------------------------------------------
Note added at 17 mins (2007-12-20 10:06:10 GMT)
--------------------------------------------------

Here’s some pics

If you have a look at a vintage bike or car you’ll see. They were used before hydraulic oil dampers appeared. You tighten up or loosen the wing nut to have more or less friction and more or less damping between the plates.

http://www.vintagecarparts.co.uk/en/list andre hartford shoc...