Pipe grooving device having flared cup

Patent metadata

Field	Value
Publication number	US-11446725-B2
Application number	US-202016998385-A
Country	US
Kind code	B2
Filing date	Aug 20, 2020
Priority date	Aug 21, 2019
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A pipe grooving device has a flared cup which surrounds a pipe end stop. The cup and the pipe end stop are mounted on a fixed pinion about which a carriage rotates. The carriage carries geared cams which engage the pinion and rotate synchronously when the carriage rotates relatively the pinion. The cams engage a pipe element received by the cup and form a circumferential groove in the pipe element. The cup and the pipe stop move independently of one another axially along a pinion shaft to actuate rotation of the carriage. The flared cup accommodates dimensional pipe diameter tolerances and mitigates pipe flare and maintains pipe roundness during the grooving process.

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;
a carriage surrounding said pinion, said carriage being rotatable about said pinion axis and defining an opening arranged coaxially with said pinion axis for receiving said pipe element;
a cup positioned adjacent to said pinion, said cup having a sidewall arranged coaxially with said pinion axis and defining an interior, said sidewall having an inner surface, said inner surface have a first diameter located distal to said pinion and a second diameter located proximate to said pinion, said first diameter being larger than said second diameter, said interior facing said opening for receiving said pipe element, said cup being movable along said pinion axis toward and away from said pinion;
a pipe end stop positioned within said interior between said first and second diameters, said pipe end stop being movable along said pinion axis toward and away from said pinion relatively to said cup;
a stop spring acting on said pipe end stop and biasing said pipe end stop away from said pinion;
a plurality of gears mounted on said carriage, each said gear being rotatable relatively to said carriage about a respective gear axis, at least one of said gears engaging directly 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 and engageable with said pipe element received within said opening, each one of said first cam surfaces comprising a region of increasing radius, each one of said first cam surfaces comprising a first discontinuity of said first cam surface.

2. The device according to claim 1 , wherein each said gear engages directly with said pinion.

3. The device according to claim 2 , wherein each said gear has a same pitch circle diameter.

4. The device according to claim 1 , further comprising a cup spring acting between said cup and said pinion and biasing said cup away from said pinion.

5. The device according to claim 4 , wherein said cup spring comprises a conical spring.

6. The device according to claim 1 , wherein said sidewall has a conical inner surface.

7. The device according to claim 6 , wherein said conical inner surface defines an included angle from 11° to 16°.

8. The device according to claim 1 , further comprising a pinion shaft, said pinion being fixedly mounted on said pinion shaft, said carriage being rotatably mounted on said pinion shaft.

9. The device according to claim 8 wherein said pinion shaft defines a bore coaxially aligned with said pinion axis.

10. The device according to claim 9 , further comprising a cup shaft positioned within said bore, said cup shaft being movable along said pinion axis within said bore, a first end of said cup shaft projecting from said bore, said cup being mounted proximate to said first end of said cup shaft.

11. The device according to claim 10 , wherein said cup comprises:
a hub coaxially receiving said cup shaft;
a back wall extending outwardly from said hub, said sidewall being attached to said back wall.

12. The device according to claim 10 , wherein said pipe end stop comprises:
a sleeve fixedly mounted on said cup shaft;
a plate mounted on said sleeve and extending outwardly therefrom, said plate defining a pipe engaging surface facing said opening.

13. The device according to claim 12 , wherein said plate further comprises a reverse cone surface positioned within said pipe engagement surface, said reverse cone surface having an increasing slope when measured in a direction extending radially from said sleeve.

14. The device according to claim 12 , wherein said cup comprises:
a hub coaxially receiving said sleeve;
a back wall extending outwardly from said hub, said sidewall being attached to said back wall.

15. The device according to claim 8 , further comprising:
a base;
a post mounted on said base, said pinion shaft being fixedly mounted on said post.

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

17. 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 having a gap therein, said gap being aligned axially with said first discontinuity of said first cam surface surrounding said one cam body.

18. The device according to claim 17 , wherein said at least one traction surface comprises a plurality of projections extending outwardly therefrom.

19. The device according to claim 17 , wherein said at least one traction surface is positioned proximate to said first cam surface surrounding said one cam body.

20. The device according to claim 17 , wherein said pinion has a pitch circle diameter equal to an outer diameter of said pipe element.

21. The device according to claim 20 , wherein said at least one traction surface has a pitch circle diameter equal to a pitch circle diameter of one of said gears.

22. The device according to claim 20 , 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, each one of said traction surfaces having a pitch circle diameter equal to said pitch circle diameters of said gears.

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

24. The device according to claim 1 , comprising at least five said gears.

Assignees

• Victaulic Co Of America

Inventors

• Dole Douglas R

Classifications

• B21D15/06

  annularly {(with thinning B21C37/205)} · CPC title

• B21D51/12

  objects with corrugated walls · CPC title

• B21D17/04 Primary

  by rolling · CPC title

• B21D45/02

  Ejecting devices · CPC title

• B21D43/26

  Stops · CPC title