HARRY C LEDEBUR
Engineers in Canfield, OH

5315854, May 31, 1994

Jun 11, 1992

7/897010

Harry C. Ledebur - Canfield OH

KW Industries, Inc. - Sugar Land TX

B21D 700, B21D 1108, B21D 3714

72297

An apparatus for tapering a tube having a frame, a tube receiving end connected to the frame, a variable-orifice die arranged so as to be movable relative to the frames, and an axial tension cylinder connected to the tube receiving end so as to apply tension forces to the tube. The variable-orifice die includes a stand having a housing and a plurality of die segments arranged within the housing. The die segments contain a circular groove of varying radius. The die segments define an orifice having an entry plane and an exit plane. The exit plane and the entry plane are offset from the plane of rotation of the die segments. The orifice is truly round in a plane parallel to and offset from the plane of rotation. A motion control processer is interactively connected with the die stand and with the axial tension cylinder for controlling a position of the axial tension cylinder relative to a rate of reduction of the diameter of the tube.

4329864, May 18, 1982

Aug 11, 1980

6/176956

Harry C. Ledebur - Canfield OH

Wean United, Inc. - Pittsburgh PA

B21B 3112

72239

Disclosed is a vertical stand of a sizing mill for rolling seamless tube in which each roll of the mill is contained in and supported by a yoke moveable both transversely of the product passline and axially of the roll axis, the latter adjustment being performed by an elevator arranged normally at the bottom of the mill for moving both yokes as a unit with their rolls, i. e. a yoke-roll set, through the top of the stand to a roll changing position where both yokes are transferred as a unit to one of two in-lined arranged side shifting carriages supported by the stand, the arrangement being such that when a used yoke-roll set is moved away from the stand at the top thereof by one of the carriages a replacement yoke-roll set is positioned above the stand of the other carriage in readiness to be received and lowered into the stand by the elevator.

4052898, Oct 11, 1977

Sep 13, 1976

5/722906

Charles Leroy Miller - New Wilmington PA
Harry Calhoon Ledebur - Canfield OH

Wean United, Inc. - Pittsburgh PA

B21B 1700, B21B 3500

72214

The disclosure of the present invention relates to a torque and mass compensating counterweight system employed with the drive of a cold pilger rolling mill. The counterweight is connected directly to the crank by a sliding block, displaceable in a slot provided in the counterweight, in which the counterweight is arranged to reciprocate 90. degree. out of phase with the crank and is arranged in guides to move in a plane parallel to the direction of movement of the mill.

4037444, Jul 26, 1977

Jan 10, 1977

5/758384

Harry Calhoon Ledebur - Canfield OH
Floyd William Diehl - Youngstown OH

Wean United, Inc. - Pittsburgh PA

B21B 3700, B21B 1706

72 21

A system for incremently and continuously feeding tubes between dies during a prescribed angle of rotation of a crank assembly in a cold pilger mill. As a main motor drives the crank assembly, a servo-motor, receiving a signal from a digital control unit, which receives a signal from a pulsating encoder associated with the main drive, operates to incremently advance a carriage and shell a controlled predetermined distance between the dies. A reversal of the servo-motor returns the carriage to the initial position in preparation to advance another shell.

3945547, Mar 23, 1976

Apr 26, 1974

5/464542

Harry C. Ledebur - Canfield OH

Wean United Inc. - Pittsburgh PA

B65h 1724

226172

Tractive apparatus for longitudinally moving elongated material providing opposed tractive assemblies for gripping material therebetween by opposed and balanced gripping forces. Each tractive assembly provides a plurality of tractive members in end-to-end relation confined to circulation in a closed path and the apparatus is characterized by the provision of means for holding the tractive members in abutting relationship at least during the time they grip the material. The apparatus is further characterized by the reduction of frictional forces on the tractive members by forcing the latter against the elongated material by sets of rolling bodies, each set of which circulates in a closed path within a respective tractive member path. Each tractive member has a material gripping face and each face is maintained in assembled relation with its tractive member by magnetic attraction to provide for ready removal and replacement of such faces.