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    Pumping unit with speed transducer
    3.
    发明专利
    Pumping unit with speed transducer 未知

    公开(公告)号：AU3576497A

    公开(公告)日：1998-02-09

    申请号：AU3576497

    申请日：1997-07-16

    Applicant: APPLIED POWER INC

    Inventor： STEBER GEORGE R ,  KNUTSON DALE A ,  MILLER DOUGLAS P

    IPC: B25B21/00 ,  B25B23/145 ,  B25F5/00 ,  F04B49/10 ,  F15B11/028 ,  F04B49/06

    Abstract: A system for tightening a threaded fastener with a hydraulic wrench has a pumping unit which measures parameters representative of the torque applied to the fastener and the angle of advance of the fastener, remote from the wrench. The pump measures pressure as a parameter representative of torque and measures flow rate, pump speed (for a fixed displacement pump), or time (for a fixed displacement pump driven at constant speed) as a parameter representative of the angle of advance of the fastener. A ratchet-type hydraulic wrench is used, and the pressure versus angle data produced in tightening a fastener is manipulated to discard irrelevant portions and smooth relevant portions to provide data representative of torque and angle during the tightening process from which to determine a final stopping parameter for terminating tightening. The system also has a calibration fixture for determining the volumetric rate of angle advance for a given wrench. Any tightening methodology dependent upon angle may be used to practice the invention, or the invention may be applied to monitor the tightening process.

    FLUID CONTROL VALVE
    4.
    发明专利
    FLUID CONTROL VALVE 未知

    公开(公告)号：CA2076642C

    公开(公告)日：1997-09-30

    申请号：CA2076642

    申请日：1991-03-15

    Applicant: APPLIED POWER INC

    Inventor： JANECKE JAMES P ,  FRITZ FRANK M ,  STOBBS THOMAS J ,  KNUTSON DALE A ,  PATEL KISHOR J

    IPC: B60G17/056 ,  F16F9/46 ,  F16K31/06

    Abstract: A direct-operated, two-way solenoid valve is disclosed. The valve balances the hydraulic flow forces acting on a poppet (24) in order to achieve fast-acting, high-flow operation. The valve has a housing (12) with the poppet (24) mounted in a main bore. The poppet (24) has a sealing end (66) with a longitudinal central bore (70) that is open at the sealing end and terminates in a pressure wall (72). A radial cross bore (74) in the poppet provides fluid communication between the central bore (70) and an outlet port (22) formed in the housing. The sealing end (66) of the poppet may contact a valve seat (82) to prevent fluid communication between an inlet port and the central bore of the poppet. The sealing end (66) of the poppet is biased into contact with the valve seat (82) to prevent fluid communication between the inlet port (20) and the central bore. An actuator (16) generating a magnetic flux path tends to move the poppet out of contact with the valve seat (82).

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