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1. WO1991008408 - LANTERN RING COIL AND METHOD OF MANUFACTURE

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WE CLAIM:

1. A method of making a length of material from which a shorter portion may be cut for use as a lantern ring adjacent a shaft in rotating or reciprocating equipment, comprising the steps of:
a) extruding a straight section of plastic material having a generally H-shaped cross-εection defined by continuous side walls extending between inner and outer edges thereof, and by continuous inner and outer surfaces spaced inwardly from said inner and outer edges respectively;
b) providing a plurality of first holes extending from said outer surface to said inner surface and spaced apart along said section of material;
c) providing a plurality of second holes extending from one side wall to the other side wall and spaced apart along said section of material, with each second hole being located between a pair of said first holes; and
d) die forming said section of material into a helix with said inner edges defining a cylindrical space having a diameter approximately equal to the smallest diameter shaft with which a lantern ring made from said helix is to be used.

2. The method of Claim 1, including the step of causing the outer surfaces defined by said side walls to converge slightly from said outer edges to said inner edges.

3. The method of Claim 1, including the steps of heating the die-formed helix to a temperature of about 225°F (107°C), winding the heated helix on a cylindrical mandrel having a diameter generally equal to that of said cylindrical space, cooling said heated helix and maintaining the cooled helix at a desired diameter until it is to be used.

4. The method of Claim 3, wherein said maintaining step is achieved by placing the cooled helix in a cylindrical restraining tube of a predetermined inside diameter.

5. A method of making a length of material from which a shorter portion may be cut for use as a lantern ring adjacent a shaft in rotating or reciprocating equipment, comprising the steps of:
a) extruding a straight section of plastic material having a generally rectangular cross-section;
b) machining said straight section to a generally H-shaped cross-section defined by continuous side walls extending between inner and outer edges thereof and by continuous inner and outer surfaces spaced inwardly from said inner and outer edges respectively;
c) providing a plurality of first holes extending from said outer surface to said inner surface and spaced apart along said section of material;
d) providing a plurality of second holes extending from one side wall to the other side wall and spaced apart along said section of material, with each second hole being located between a pair of said first holes; and
e) die forming said section of material into a helix with said inner edges defining a cylindrical space having a diameter approximately equal to the smallest diameter shaft with which a lantern ring made from said helix is to be used.

6. The method of Claim 5, including the step of causing the outer surfaces defined by said side walls to converge slightly from said outer edges to said inner edges.

7. The method of Claim 5, including the steps of heating the die-formed helix to a temperature of about 225°F (107°C), winding the heated helix on a cylindrical mandrel having a diameter generally equal to that of said cylindrical space, cooling said heated helix and maintaining the cooled helix at a desired diameter until it is to be used.

8. The method of Claim 7, wherein said maintaining step is achieved by placing the cooled helix in a cylindrical restraining tube of a predetermined inside diameter.

9. A method of making a length of material from which a shorter portion may be cut for use as a lantern ring adjacent a shaft in rotating or reciprocating equipment, comprising the steps of:
a) extruding a length of plastic material into a helical form with the material having a generally H-shaped cross- section defined by continuous side walls extending between inner and outer edges thereof and by continuous inner and outer surfaces spaced inwardly from said inner and outer edges respectively;
b) providing a plurality of first holes extending generally radially through said material from said outer surface to said inner surface and spaced apart along said length of material;
and
c) providing a plurality of second holes extending generally axially from one side wall to the other side wall and spaced apart along said length of material, with each second hole being located between a pair of said first holes.

10. A length of plastic material formed into a helix and from which a shorter portion may be cut for use as a lantern ring adjacent a shaft in rotating or reciprocating equipment, said material having a generally H-shaped cross-section defined by continuous axially spaced side walls extending between radially inner and outer edges thereof and by radially inner and outer surfaces spaced inwardly from the inner and outer edges respectively, and a plurality of generally radially extending holes passing through said material between said outer surface and said inner surface and spaced apart along said length of material; characterized by a plurality of generally axially extending holes passing through said material between one side wall and the other side wall and spaced apart along said length of material, each such axially extending hole being generally centrally located between adjacent pairs of said radially extending holes.

11. The length of material as defined in Claim 10, characterized in that the inner diameter of the helix as defined by the inner edges of said side walls is approximately equal to the smallest diameter shaft with which a lantern ring made therefrom is to be used.

12. The length of material as define 'n Claim 11, characterized in that said side walls have axially spaced apart surfaces that converge from said outer edges to said inner edges.

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13. The length of material as defined in Claim 10, characterized in that an axially extending hole is provided between each pair of said radially extending holes.

14. The length of material as defined in Claim 10, characterized in that said axially spaced side walls have corresponding surfaces that converge from said outer edges to said inner edges at an angle of convergence of about 10°.

15. The length of material as defined in Claim 10, characterized in that said radially extending holes are positioned generally centrally of said inner and outer surfaces.

16. The length of material as defined in Claim 10, characterized in that said generally axially extending holes extend through said material between said inner and outer surfaces.

17. The length of material as defined in Claim 16, characterized in that said radially extending holes are positioned generally centrally of said inner and outer surfaces.

18. The length of material as defined in Claim 16, characterized in that an axially extending hole is provided between each pair of said radially extending holes.