Claims
- 1. In a pumping unit for supplying a flow of hydraulic fluid under pressure to a hydraulically powered device of the type having a hydraulic pump, a motor for driving said pump and a shaft for transmitting torque from said motor to said pump at a certain speed, the improvement wherein said device is a hydraulic torque wrench and said pumping unit further comprises a speed transducer for generating a speed signal representative of said angular speed of said shaft and a controller for processing said speed signal into a signal which is representative of an angular position of said wrench.
- 2. The improvement of claim 1, further comprising a controller for converting said speed signal into a flow rate signal for subsequent processing or display.
- 3. The improvement of claim 1, wherein said controller converts said speed signal into a signal representative of flow as a function of pressure.
- 4. The improvement of claim 1, wherein said controller processes said speed signal to generate a flow signal which is representative of the volume of flow delivered to said device.
- 5. The improvement of claim 4, wherein said controller generates a control signal for controlling said device in response to said flow signal reaching a certain value.
- 6. An apparatus as claimed in claim 1, wherein said device includes a hydraulic cylinder and said flow signal is representative of a position of said cylinder.
Parent Case Info
This is a continuation of application No. 08/682,209 filed Jul. 17, 1996, now U.S. Pat. No. 5,668,328.
US Referenced Citations (18)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0 297 515 A1 |
Jan 1989 |
EPX |
0 718 496 A2 |
Jun 1996 |
EPX |
62-29778 |
Feb 1987 |
JPX |
WO 9511777 |
May 1995 |
WOX |
Non-Patent Literature Citations (2)
Entry |
RS Technologies, Ltd.; "Bolted Joints: Fundamentals of Torque-Turn Tightening"; 1995. |
Enerpac.RTM./Plarad Power Wrench; Torque Wrench Systems; "Hydraulic Torque Wrenches"; 1993. |
Continuations (1)
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Number |
Date |
Country |
Parent |
682209 |
Jul 1996 |
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