PACKLESS EXPANSION JOINT: Metal bellows expansion joint - See Packed Expansion Joint. PANTOGRAPH LINKAGE: A scissors like structure installed on a Universal Expansion Joint to equalize the movement of the two bellows elements.

What is meant by expansion joints?

1 : a coupling (as of steam pipes) designed to permit an endwise movement that compensates for expansion or contraction resulting from temperature changes. 2 : a joint or gap (as in concrete work) designed to permit expansion or contraction resulting from temperature changes.

What is a seismic expansion joint?

A seismic expansion joint, the SJS System is watertight and features a trafficable cover plate that is not attached to the concrete deck. It is comprised of silicone-and-impregnated-foam hybrid components that ensure watertightness, absorb sound, dampen vibration and offer uncomplicated installation.