earthquake restraint bracket system provides increased safety and
stability for optical tables in high-risk earthquake areas without
affecting table performance.
The TMC earthquake restraint system relies
on top brackets and upper tiebars to control motion of the table
top and, where severe occurrences are anticipated, floor brackets
with lower tiebars to secure the support structure to the floor.
Under normal conditions, there is no contact between the top brackets
and the support structure, so that performance of the optical
top and the vibration isolation system are not affected. Clearances
are large and brackets are lightweight, stiff, well-damped, unobtrusive
and encapsulated with soft elastomer to provide gradual snubbing.
Our earthquake restraint bracket system
can be retrofitted to an installed TMC optical table or specified
with a new order.
Inferior, competitive designs may depend
on large, pendulum-like structures that hang below the table top
and connect to the floor. Since pendulums characteristically have
low resonant frequencies, these add-on structures lower the resonant
frequency of the table top and degrade compliance and damping.
In addition, the floor connection creates a potential rigid coupling
between table top and floor, which can compromise vibration isolation
if it drifts out of calibration.