Seismic displacement recorder for base-isolated structures

Details Seismic displacement recorder for base-isolated structures Seismic displacement recorder for base-isolated structures

1986-04-03

1987-08-04

Shaw, Clifford C.

Recorders

Record tracer movement responsive to inertia or mass...

346 77R, 73786, 73594, G01D 900, G01D 1502, G01M 100, G01M 500

Patent

active

046849580

ABSTRACT:
A mechanical seismic instrument for recording relative horizontal displacements between the base and foundation of base-isolated buildings or other large structures during earthquakes. A rigid tripod-like arm is connected to the base of the structure; on the other end of the arm is a marking stylus. A record plate is connected to the foundation. When base and foundation move relative to one another, the stylus scribes a record trace on the record plate. Arm and record plate are mounted respectively on mounting plates which are connected and covered by a flexible enclosure. Timing marks on the record trace may be made by striking devices which tap against the shank of the stylus.

REFERENCES:
patent: 2474400 (1945-03-01), Van Degrift
patent: 3795006 (1987-02-01), Engdahl

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