Pipe grooving device

Patent metadata

Field	Value
Publication number	US-11383285-B2
Application number	US-202117178382-A
Country	US
Kind code	B2
Filing date	Feb 18, 2021
Priority date	Dec 19, 2017
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

A device for forming circumferential grooves in pipe elements uses multiple geared cam bodies mounted on a carriage which rotates about a fixed pinion. The gears engage with the pinion which causes the geared cam bodies to rotate relative to the carriage. Traction surfaces and cam surfaces on the cam bodies traverse the outer surface of the pipe element and impress a circumferential groove therein. To substantially prevent rotation of the pipe element the pitch circle diameter of the pinion equals the outer diameter of the pipe element and the pitch circle diameters of the traction surfaces equal the pitch circle diameters of the gears.

First claim

What is claimed is:

1. A device for forming a circumferential groove in a pipe element, said device comprising:
a pinion fixed against rotation about a pinion axis arranged coaxially with said pinion;
an expanding die positioned adjacent to said pinion and concentric with said pinion axis, said expanding die having a plurality of die segments movable radially toward and away from said pinion axis, each said die segment having a die face facing away from said pinion axis and engageable with an inner surface of said pipe element when said die segments are moved away from said pinion axis;
an actuator coupled to said expanding die for moving said die segments toward and away from said pinion axis;
a carriage surrounding said expanding die, said carriage being rotatable about said pinion axis;
a plurality of gears mounted on said carriage, each said gear being rotatable relatively to said carriage about a respective gear axis, each said gear engaging with said pinion;
a plurality of cam bodies, each said cam body mounted on a respective one of said gears;
a plurality of first cam surfaces, each one of said first cam surfaces extending around a respective one of said cam bodies, each one of said first cam surfaces comprising a region of increasing radius and a discontinuity, said regions of increasing radius being engageable with an outer surface of said pipe element upon rotation of said carriage to impress said groove into said outer surface.

2. The device according to claim 1 , wherein said actuator comprises:
a draw bar positioned coaxially with said expanding die and movable along said pinion axis, motion of said draw bar moving said die segments toward and away from said pinion axis.

3. The device according to claim 2 , further comprising a cylinder having a piston coupled to said draw bar for moving said draw bar along said pinion axis.

4. The device according to claim 1 wherein each said gear has a same pitch circle diameter.

5. The device according to claim 1 , further comprising at least one traction surface extending around one of said cam bodies, said at least one traction surface being engageable with said pipe element.

6. The device according to claim 1 , wherein said pinion has a pitch circle diameter equal to an outer diameter of said pipe element.

7. The device according to claim 6 , further comprising at least one traction surface extending around one of said cam bodies, said at least one traction surface being engageable with said pipe element, said at least one traction surface having a pitch circle diameter equal to a pitch circle diameter of one of said gears.

8. The device according to claim 1 , wherein each one of said first cam surfaces further comprises a region of constant radius positioned adjacent to a respective one of said discontinuities.

9. The device according to claim 5 , wherein said at least one traction surface has a gap therein, said gap being aligned axially with said discontinuity of said first cam surface surrounding said one cam body.

10. The device according to claim 7 , wherein said at least one traction surface has a gap therein, said gap being aligned axially with said discontinuity of said first cam surface surrounding said one cam body.

11. The device according to claim 5 , further comprising a plurality of said traction surfaces, each one of said traction surfaces extending around a respective one of said cam bodies, each one of said traction surfaces having a gap therein, each said gap being aligned axially with a respective one of said discontinuities of said first cam surfaces on each one of said cam bodies.

12. The device according to claim 7 , further comprising a plurality of said traction surfaces, each one of said traction surfaces extending around a respective one of said cam bodies, each one of said traction surfaces having a gap therein, each said gap being aligned axially with a respective one of said discontinuities of said first cam surfaces on each one of said cam bodies.

13. The device according to claim 5 , wherein said at least one traction surface is positioned on said one cam body in spaced relation to said first cam surface extending around said one cam body.

14. The device according to claim 7 , wherein said at least one traction surface is positioned on said one cam body in spaced relation to said first cam surface extending around said one cam body.

15. The device according to claim 1 , comprising, at least three said gears.

16. The device according to claim 1 , comprising, at least four said gears.

17. The device according to claim 5 , wherein one of said first cam surfaces is positioned between said gear and said at least one traction surface.

18. The device according to claim 7 , wherein one of said first cam surfaces is positioned between said gear and said at least one traction surface.

19. The device according to claim 5 , wherein one of said first cam surfaces is positioned proximate to said at least one traction surface.

20. The device according to claim 7 , wherein one of said first cam surfaces is positioned proximate to said at least one traction surface.

21. The device according to claim 5 , wherein said at least one traction surface comprises a plurality of projections extending outwardly therefrom.

22. The device according to claim 7 , wherein said at least one traction surface comprises a plurality of projections extending outwardly therefrom.

23. The device according to claim 1 , further comprising a plurality of second cam surfaces, each one of said second cam surfaces extending around a respective one of said cam bodies and positioned in spaced relation to a respective one of said first cam surfaces.

24. The device according to claim 23 , wherein each one of said second cam surfaces comprising a region of increasing radius and a discontinuity, each said discontinuity of said second cam surfaces being aligned with a respective one of said discontinuities of said first cam surfaces.

25. The device according to claim 24 , wherein each one of said second cam surfaces comprises a region of constant radius positioned adjacent to a respective one of said discontinuities of said second cam surfaces.

26. The device according to claim 23 , wherein each one of said second cam surfaces has a constant radius.

27. The device according to claim 23 , further comprising at least one traction surface extending around one of said cam bodies, said at least one traction surface having a gap therein, said gap being aligned axially with said discontinuity of said first cam surface surrounding said one cam body.

28. The device according to claim 27 , wherein said at least one traction surface comprises a plurality of projections extending outwardly therefrom.

29. The device according to claim 27 , wherein said first cam surface surrounding said one cam body is positioned between said at least one traction surface and said second cam surface surrounding said one cam body.

30. The device according to claim 27 , wherein said first and said second cam surfaces surrounding said one cam body are positioned between said at least one traction surface and one of said gears on which said one cam body is mounted.

31. The device according to claim 27 , wherein said first cam surface surrounding said first cam body is positioned proximate to said at

Assignees

• Victaulic Co Of America

Inventors

• Dole Douglas R

Classifications

• F16H25/04

  for conveying rotary motion · CPC title

• B21D17/04 Primary

  by rolling · CPC title

• B21H1/18 Primary

  cylinders, e.g. rolled transversely {cross-rolling} · CPC title

• F16H53/025

  characterised by their construction, e.g. assembling or manufacturing features · CPC title

• F16H1/28

  with gears having orbital motion · CPC title