Abstract: A boom for a crane assembly includes first and second sections. The second section is configured to be at least partially nested within the first section of the boom, and is further configured to slide relative to the first section of the boom. Each of the first and second sections of the boom have a tubular cross-section. Furthermore, the first and second sections of the boom each include first and second pieces. The first piece has two edges extending lengthwise along the respective section, and the second piece has two edges extending lengthwise along the respective section. The first and second pieces are arranged such that the two edges of the first piece overlap the two edges of the second piece, and the first and second pieces are welded together along an exterior end of the overlapping edges.

Abstract: A head cover assembly for a compressor according to the present invention includes a valve plate mounted onto the compressor cylinder having a first side, a second side, a first bore, and a second bore, a first valve connected to the first side of the plate for controlling flow through the first bore, and a second valve connected to the second side of the plate for controlling flow through the second bore. The first and second valves are attached substantially adjacent the center of the plate using a single fastener. A cover is mounted onto the second side of the valve plate. The cover includes a continuous side wall which surrounds the first and second bores, an enclosure wall extending between the top edge of the side wall thereby enclosing a volume above the valve plate, and a divider wall which extends between the side wall through the enclosed volume to define an intake volume and an exhaust volume.

Abstract: A scroll machine has a multi-functional device which is attached to either or both of the scroll members that serves the purpose of optimizing or altering the discharge port geometry to a specific compression ratio or for modulation of compression ratios for performance optimization.

Abstract: A scroll-type machine has a motion controlling member for preventing relative rotation between a first and a second scroll member while allowing relative orbiting motion therebetween. The scroll-type machine includes a novel arrangement of a spring or other flexible member for biasing the motion controlling member in a specific direction. The biasing of the motion controlling member operates to reduce the mechanical impact noise or rattle which is caused by the vibration of the machine's operating components.

Abstract: A scroll-type machine has a motion controlling member for preventing relative rotation between a first and a second scroll member while allowing relative orbiting motion therebetween. The scroll-type machine includes a novel arrangement of a spring or other flexible member for biasing the motion controlling member in a specific direction. The biasing of the motion controlling member operates to reduce the mechanical impact noise or rattle which is caused by the vibration of the machine's operating components.

Abstract: A scroll machine has a multi-functional device which is attached to either or both of the scroll members that serves the purpose of optimizing or altering the discharge port geometry to a specific compression ratio or for modulation of compression ratios for performance optimization.

Abstract: A scroll-type machine has a motion controlling member for preventing relative rotation between a first and a second scroll member while allowing relative orbiting motion therebetween. The scroll-type machine includes a novel arrangement of a spring or other flexible member for biasing the motion controlling member in a specific direction. The biasing of the motion controlling member operates to reduce the mechanical impact noise or rattle which is caused by the vibration of the machine's operating components.

Abstract: A scroll machine designed to provide an unbalanced loading of the orbiting scroll and anti-rotation coupling in a direction which adds to the moment caused by contact forces between the scroll wraps during normal operation. The loading decreases the sound level of the machine and is achieved through the use of unbalanced flank gas leakage forces and flank contact forces, which are created by providing a targeted initial swing radius bias and/or a generating radius bias to either one or both of the scroll wraps. The generating radius biasing can be singular or plural on a given scroll wrap set. A number of different techniques for obtaining such biasing are disclosed.