Abstract: A pressure relief liquid spray dispenser apparatus 10 is provided that allows a gas charged liquid spray dispenser 24 to be utilized in high temperature environments. The liquid spray dispenser apparatus 10 includes a supporting bracket 12 ) which receives a gas charged dispenser 24. The dispenser 24, having a domed shaped valve end 98 is positioned in an aperture 14 in the supporting bracket 12 so that a valve 27 on the head 98 is positioned adjacent to a control arm 50. The control arm 50 can be pivoted in the direction of the dispenser 24 to engage the valve 27 thereby releasing spray in the dispenser. The domed shaped valve end 98 of the dispenser 24 has a bellows like construction. The valve end 98 unfolds longitudinally outward when subject to excessive pressures from the expansion of the gas in the dispenser 24 at high temperatures. When this occurs the dispenser valve 27 engages the control arm 50 pivoting it away from the dispenser 24 and releasing spray in the dispenser.

Abstract: A mobile excavator having a self-powered frame structure supporting a platform for rotation about a vertical axis with a boom pivoted on a platform and a material handling device pivoted on the free end of the boom. The boom is formed in first and second boom sections which are pivotally interconnected to each other and movable relative to each other to vary the overall length of the boom.

Abstract: The novel arrangement of prime movers and associated driven pumps in cooperation with a hydraulic summating system disclosed in this application consists of a plurality of prime movers, each of which is connected to drive a group of interconnected fixed displacement pumps. Separate sets of pumps are formed with one pump of each driven group connected in parallel to supply fluid under pressure to separate systems containing various hydraulically operated functions. The summating system includes a valve arrangement whereby the total engine power generated by the prime mover of each group of pumps is available for one or all pumps in the group and thus any one or all of the hydraulically operated functions in each system has available all or a portion of the prime movers' total engine power up to the maximum available.