Abstract: An electrically operated displacement pump includes an electric motor having a stator and a rotor. The rotor is connected to the fluid displacement member to drive axial reciprocation of the fluid displacement member. A drive mechanism is disposed between and connected to each of the rotor and the fluid displacement member. The drive mechanism receives a rotational output from the rotor and provides a linear input to the fluid displacement member. A controller controls operation of the motor based on an operating state of the motor to control pumping by the displacement pump.

Abstract: An electrically operated displacement pump includes an electric motor having a stator and a rotor. The rotor is connected to the fluid displacement member to drive axial reciprocation of the fluid displacement member. A drive mechanism is disposed between and connected to each of the rotor and the fluid displacement member. The drive mechanism receives a rotational output from the rotor and provides a linear input to the fluid displacement member. A controller controls operation of the motor based on an operating state of the motor to control pumping by the displacement pump.

Abstract: A crane, with a pendant supported boom rotating in a vertical plane, the pendants operable to rotate said boom by a mast rotating in a vertical plane, means to rotate the mast, and said means to rotate operable to restrain the mast from counter rotation; wherein the improvement being a clutch releaseably coupling said mast to said boom, said clutch operable to restrain rotation of said boom in either direction in the absence of rotation of said mast.

Abstract: A multi-sectioned, telescopically extending column. This invention includes an extension mechanism to extend the column and support the column sections during extension, and a locking mechanism to lock each column section to the next when the column reaches its extended position. The column is particularly well suited for use as a crane boom, where individual boom sections are nearly fully extended each from within the other to minimize overlap between adjacent sections and reduce dead weight resulting from such overlap.

Abstract: A structural boom, as for a crane, including at least one corrugated section; a telescoping boom crane having a multi-sectioned, telescopically extending boom; and an extensible pendant support system including a plurality of pendants.

Abstract: A telescoping boom crane having a multi-sectioned, telescopically extending boom and an extensible pendant support system. The extending boom includes boom sections that are extensibly receivable within the adjacent boom section. The boom sections are made of a sheet material. A releasable locking mechanism may be attached to the boom sections to secure the boom sections. The extensible pendant support system includes a plurality of pendants. The pendants are extensibly receivable within an adjacent pendant. The pendant support system at least partially supports the boom when a load is applied to the boom. Further, the support system may include a forestay length locking device functioning to prohibit extension of a subsequent pendant from an adjacent pendant once the former pendant achieves an extended position.

Abstract: A telescoping boom crane having a multi-sectioned, telescopically extending boom and an extensible pendant support system. The extending boom includes boom sections that are extensibly receivable within the adjacent boom section. The boom sections are made of a sheet material. A releasable locking mechanism may be attached to the boom sections to secure the boom sections.