Step construction employing insertable fastener having deformabl

Details Step construction employing insertable fastener having deformabl Step construction employing insertable fastener having deformabl

1976-06-21

1978-07-18

Purser, Ernest R.

Fire escape, ladder, or scaffold

Wall- or floor-attached

Independent rung or step

E04F 1900

Patent

active

041009975

ABSTRACT:
A molded plastic fastener of the sort which may be used as part of steps for a concrete manhole has molded plastic, circular threads or projections which are tapered and deformable so that when inserted in a drilled hole of slightly smaller diameter the projections will be deformed and bend under pressure to retain the fastener in place.

REFERENCES:
patent: 2064803 (1936-12-01), Grove
patent: 2650032 (1953-08-01), Godfrey
patent: 3867864 (1975-02-01), Knohl

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