US 7,743,673 B2Granted

Method for the angle-controlled turning of a part

AssigneeWagner Vermögensverwaltungs-GmbH & Co. KG

InventorsPaul-Heinz Wagner, Ulf Sittig, Guenter Andres, Bernd Thelen

Life of this patent

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Abstract

A power wrench (10) for turning a screw is supplied by a hydraulic unit (25) that contains a positive displacement pump (26) and supplies a defined rate of flow. The pressure in a hydraulic pressure line (28) is measured by a pressure sensor (32) and provided to a control unit (31). The volume flow of the hydraulic unit (25) is determined in amount per unit of time. The piston stroke per unit of time can be determined due to the fact that the filling volume of the hydraulic cylinder is known. The piston acts upon a lever system that turns the moving part. The turning angle per unit of time can be determined due to the fact that the lever length is known. This makes it possible to dispense with an angle measuring device and to determine the turning angle merely by measuring pressure.

Claims4

Dependent claims

A method for the angle-controlled turning of a turnable part using a hydraulic piston/cylinder drive and a ratchet, the method comprising:

prior to a working operation, the angular speed being determined as the relationship between the turning angle and the turning time at a defined volume flow being supplied to the piston/cylinder drive;
in the subsequent working operation, the piston/cylinder drive being supplied with a defined volume flow and the duration being measured;
in a turning angle mode, the turning angle being determined from the duration and the angular speed;
prior to performing the turning angle mode, a torque mode being performed, including the turning part being turned until an assembly torque is reached;
the piston/cylinder drive being supplied with a defined volume flow;
and the torque mode being stopped when the pressure built up at the piston/cylinder drive has reached a value corresponding to the assembly torque.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/578,065Filed 7 Apr 2005
Priority: DE 10 2004 017 97914 Apr 2004
Published: US 2009/0000397 A11 Jan 2009
Granted: 29 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

B25B 21/005
Of the ratchet type: driven by a radially acting hydraulic or pneumatic piston
B25B 23/145
Arrangement of torque limiters or torque indicators in wrenches or screwdrivers: specially adapted for fluid operated wrenches or screwdrivers
B25B
Tools or bench devices not otherwise provided for, for fastening, connecting, disengaging

Family

US 2009/0000397 A1Pre-grant publication · published 1 Jan 2009
US 7,743,673 B2This patent

From the US filing history. Foreign family members aren’t listed.

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