Appeal No. 1999-0220 Page 9
Application No. 08/540,323
deformation of the ram but not permanent deformation of the
ram. In this regard, the appellant's specification provides
that (1) the general object of the invention is to provide a
mechanism for arresting an elevator "without permanently
damaging any part of the elevator" (page 3, lines 20-22); (2)
another object of the invention is to provide an elevator
arrestor that allows the elevator to be usable within a short
period of time "with little reset and repair necessary" (page
3, lines 23-25); (3) when actuated, the friction lining
material of the braking surfaces contacts the ram with
sufficient frictional force to stop the downward motion of the
ram "without deformation of the ram" (page 4, lines 16-18);
(4) annealed copper is the preferred friction lining material
for the braking surfaces since it creates "the greatest
braking force with the least amount of damage/deformation of
the ram" (page 7, lines 13-18); and (5) in an alternative
embodiment, cutting bits or teeth may be fixed to the braking
surfaces in place of or in addition to the friction lining
material such that braking is accomplished by the teeth biting
into the ram wherein that damage to the ram can be repaired by
filling and filing the gouges in the ram (page 8, lines 3-9).
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