Abstract: An alignment structure for end-to-end positioned multichanneled seats and footboards such as may be used for seating stadium stands. Channel shaped inserts positioned in adjacent front and rear channels of two end-to-end seat sections (or footboards) span the joint between the seat sections and extend endwise into each to maintain end-to-end alignment between the seat sections. Each channel shaped insert is anchored in one or the other of the end-to-end seat sections and permits expansion and contraction displacement movement between the seat sections.

Abstract: A spectator bleacher structure assembled from extruded metal sections including base, end support, tread members and posts. The end support members interconnect the posts and are bridged by the tread members. The tread members have reinforcing channel flanges depending therefrom with snap-in prongs inserted into slots formed in the end support members.

Abstract: A combination seat mounting support and armrest for concrete stadium riser installation where backrests cannot be used or are not desired.

Abstract: An alignment structure for end to end positioned multichanneled seats and footboards such as may be used for seating stadium stands. Channel shaped inserts positioned in laterally spaced front and rear channels of two end to end seat sections (or footboards) span the joint between the seat sections and extend end wise into each to maintain end to end alignment between the seat sections. Each channel shaped insert is anchored in one or the other of the end to end seat sections and permits expansion and contraction displacement movement between the seat sections.