Abstract: A door closure apparatus with boost for latching a door to which the apparatus is attached. The door closure includes two pivotal arms, an outer covering and an elongated housing. In the housing are a main piston with a rack to engage a pinion connected to rotate with one of the pivotal arms, a piston rod, a main spring, a divider wall, an adjustable main spring seat, a supplemental piston and a supplemental spring. The housing is filled with hydraulic fluid and is divided into three chambers with ports and passageways to move fluid during door opening, which stores energy in both the main and the supplemental springs, and door closing, which begins with energy from the main spring and latches with a boost of energy from the supplemental spring.

Abstract: A door closure apparatus with boost for latching a door to which the apparatus is attached. The door closure includes two pivotal arms, an outer covering and an elongated housing. In the housing are a main piston with a rack to engage a pinion connected to rotate with one of the pivotal arms, a piston rod, a main spring, a divider wall, an adjustable main spring seat, a supplemental piston and a supplemental spring. The housing is filled with hydraulic fluid and is divided into three chambers with ports and passageways to move fluid during door opening, which stores energy in both the main and the supplemental springs, and door closing, which begins with energy from the main spring and latches with a boost of energy from the supplemental spring.

Abstract: An acoustic ceiling compression strut system and method to help a suspended office building ceiling withstand an earthquake. The system includes two elongated tubes in a telescoping relationship and an adjustable locking connector placed between the two tubes and having a U-shape with two legs and a base. One tube is placed to abut a deck of the office building while the connector abuts the bottom of the tube. Thereafter, the second tube is lowered to abut a grid and the legs are bent around the top of the second tube thereby locking the two tubes and the connector and causing them to become a rigid strut.