Metal deforming – By use of tool acting during relative rotation between tool... – With cutting of work or product
Patent
1981-09-24
1983-11-15
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With cutting of work or product
72325, 72 72, B21D 3102, B21D 5300
Patent
active
044148356
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to flange forming drill apparatus for drilling a hole in the side of a pipe or the like and forming a hole encircling flange around the edge of the drilled hole. The drill apparatus includes a body supporting a drill rod thereon with legs for supporting the body to move toward and away from the pipe or workpiece. A drill bit is provided at the end of the drill rods for forming the hole upon movement of the body towards the workpiece and a plurality of flange forming members are mounted adjacent the end of the drill rod for movement between a retracted position while the hole is drilled and an outwardly extending flange forming position after drilling is completed in order to form a flange around the edge of the hole as the body is moved away from the workpiece. An adjustment cone is mounted on the drill rod to move the flange forming members between the retracted and extended position and brake bits or stops are provided on the legs for engagement by the adjusting cone for extending the flange members after the hole is drilled. A drive clutch assembly is provided to automatically move the body away from the workpiece after the hole is drilled while the flange forming members are extended in order to form a flange around the edge of the hole. The clutch includes nut elements selectively movable to engage and disengage with respect to a feed screw provided on the drill rod.
2. Description of the Prior Art
Useful flange forming drill apparatus is disclosed in U.S. Pat. Nos. 3,592,038 and 3,714,808. The apparatus disclosed in these patents has proven useful for forming flanged holes in the side of pipes and the like for the connection of branches thereto.
OBJECT OF THE INVENTION
An object of the present invention is to provide a new and improved flange forming drill apparatus capable of automatic operation to form a flange around the edge of the drill hole when the drilling is completed without interruption in the operation.
BRIEF SUMMARY OF THE INVENTION
The foregoing object is accomplished in an illustrated embodiment described herein which includes a drive clutch apparatus having a feed nut assembly operable to open and close automatically into driving engagement with a feedscrew on the drill rod when the body of the apparatus reaches a predetermined position on the support legs so that the feed nut is automatically closed at substantially the same time that the flange forming members are moved from the retracted to the extended position after the hole is completed. Closing of the feed nut around the feedscrew on the rotating drill rod initiates movement of the body away from the workpiece while the flange forming members are extended to automatically begin the formation of a flange around the edges of the drilled hole as the body moves away.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the present invention, reference should be had to the following detailed description taken in conjunction with the drawings, in which:
FIG. 1 is an elevational view of a new and improved flange forming drill apparatus in accordance with the invention with portions shown in section and illustrating the apparatus in a position wherein the drilled hole has been completed and the automatic flange forming operation is ready to commence;
FIG. 2 is an elevational view similar to FIG. 1 illustrating the apparatus in a position with the drill bit extended into the drilled hole a slight distance further so that the flange forming members are moved to an extended position;
FIG. 3 is a transverse cross-sectional view taken substantially along lines III--III in FIG. 1;
FIG. 4 is a transverse cross-sectional view taken substantially along the lines IV--IV in FIG. 1;
FIG. 5 is a transverse cross-sectional view taken substantially along line V--V of FIG. 2.
DESCRIPTION OF A PREFERRED EMBODIMENT
In accordnce with the present invention a new and improved flange forming apparatus includes a body 1 on which is rotatably journalled
REFERENCES:
patent: 3592038 (1971-07-01), Larikka
patent: 3714808 (1973-02-01), Larikka
patent: 3844149 (1974-10-01), Hansen
patent: 3884060 (1975-05-01), Larikka
patent: 4307593 (1981-12-01), Riggs
G. A. Serlachius Oy
Larson Lowell A.
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