Method of manufacturing a molded heating element assembly

• US 6,748,646 B2
• Filed: 02/21/2002
• Issued: 06/15/2004
• Est. Priority Date: 04/07/2000
• Status: Expired due to Term

• Current Assignee: Watlow Electric Manufacturing Company
• Original Assignee: Watlow Polymer Technologies
• Inventors: Von Arx, Theodore, Schlesselman, John W., Laken, Keith, Papenfuss, Ronald E.
• Primary Examiner(s): Arbes, Carl J.
• Assistant Examiner(s): Phan, Thiem D
• Application Number:
  US10/080,047
• Publication Number:
  US 20020088111A1
• Time in Patent Office: 845 Days
• Field of Search: 296/13, 296/11, 296/19, 296/21, 298/56, 298/57, 298/58, 219/438, 219/386, 219/521
• US Class Current: 29/613
• CPC Class Codes: A47G 19/2288 with means for keeping liquid cool or hot
• CPC Class Codes: A47J 27/004 with integral electrical heating means drinking cups with integral heating means A47J36/2466
• CPC Class Codes: A47J 27/2105 of the cordless type, i.e. whereby the water vessel can be plugged into an electrically-powered base element
• CPC Class Codes: A47J 36/2461 with electrical heating means
• CPC Class Codes: H05B 2203/002 Heaters using a particular layout for the resistive material or resistive elements
• CPC Class Codes: H05B 2203/003 using serpentine layout
• CPC Class Codes: H05B 2203/013 Heaters using resistive films or coatings
• CPC Class Codes: H05B 2203/014 Heaters using resistive wires or cables not provided for in H05B3/54
• CPC Class Codes: H05B 2203/017 Manufacturing methods or apparatus for heaters
• CPC Class Codes: H05B 2203/033 Heater including particular mechanical reinforcing means
• CPC Class Codes: H05B 3/00 Ohmic-resistance heating
• CPC Class Codes: H05B 3/18 the conductor being embedded in an insulating material
• CPC Class Codes: H05B 3/26 heating conductor mounted on insulating base for transparent areas H05B3/84, H05B3/86
• CPC Class Codes: H05B 3/28 heating conductor embedded in insulating material
• CPC Class Codes: Y10T 29/49083 Heater type
• CPC Class Codes: Y10T 29/49087 with envelope or housing
• CPC Class Codes: Y10T 29/49098 Applying terminal
• CPC Class Codes: Y10T 29/49101 Applying terminal
• CPC Class Codes: Y10T 29/49126 Assembling bases

Abstract

A heated element assembly and method of manufacturing heated element assemblies is provided. The heated element assembly including a first and second molded sections shaped to mate with each other is provided. A resistance heating element is secured between the first and second molded sections by an interference fit. The resistance heating element includes a piercable supporting substrate and a resistance wire sewn thereon. The resistance wire is disposed in a predetermined circuit path which is substantially encompassed by the first and second molded sections. The resistance heating element is easily fixed in a position between the first and second molded sections and is capable of providing heat on vertical, horizontal and contoured surfaces.

Claims

1. A method of manufacturing a heated element assembly, comprising the steps of:

(a) providing a first molded polymeric section;

(b) providing a second molded polymeric section shaped to mate with said first molded section;

(c) providing a resistance heating element, comprising;

(i) a first heat resistant supporting substrate having a first surface thereon;

(ii) an electrical resistance heating material sewn with a thread to said first heat resistant supporting substrate, said electrical resistance heating material forming a predetermined circuit path having a pair of terminal end portions; and

(iii) a pair of electrical conductors fixed to said terminal end portions of said electrical resistance heating material; and

(d) securing said first molded polymeric section to said second molded polymeric section, such that said first and second molded sections substantially encompass said circuit path and at least a portion of said heating element is secured between said first and second molded sections by a mechanical fit between said molded sections and said electrical resistance heating material is spaced apart from said first and second molded sections by an air gap.

2. The method of claim 1, wherein the step of securing said first molded section to said second molded section includes the step of fusing or melt bonding said first molded section to said second molded section.

3. The method of claim 1, wherein the step of securing said first molded section to said second molded section includes the step of spin welding said first molded section to said second molded section.

4. The method of claim 1, wherein the step of securing said first molded section to said second molded section includes the step of sonic welding said first molded section to said second molded section.

5. The method of claim 1, wherein the step of securing said first molded section to said second molded section includes the step of snap-fitting said first molded section to said second molded section.

6. The method of claim 5, wherein the step of snap-fitting said first molded section to said second molded section includes the step of O-ring snap fitting said first molded section to said second molded section.

7. The method of claim 1, wherein said step of securing said first molded section to said second molded section includes the step of evacuating a quantity of air from an area defined between said first molded section and said second molded section and hermetically sealing said first molded section to said second molded section.

8. The method of claim 7, further comprising the step of introducing an inert gas to said area before hermetically sealing said molded sections together.

9. A method of manufacturing a heated element assembly, comprising the steps of:

(a) providing a first molded polymeric section;

(b) providing a second molded polymeric section shaped to mate with said first molded section;

(c) providing a resistance heating element, comprising;

(i) a supporting substrate having a first surface thereon; and

(ii) an electrical resistance heating material fastened to said supporting substrate, said electrical resistance heating material forming a predetermined circuit path having a pair of terminal end portions; and

(d) securing said first molded section to said second molded section, such that said first and second molded sections substantially encompass said circuit path and at least a portion of said heating element is secured in a gapped area defined between said first and second molded sections by a mechanical fit between said molded sections.

10. The method of claim 9, wherein the step of securing said first molded section to said second molded section includes the step of fusing or melt bonding said first molded section to said second molded section.

11. The method of claim 9, wherein the step of securing said first molded section to said second molded section includes the step of spin welding said first molded section to said second molded section.

12. The method of claim 9, wherein the step of securing said first molded section to said second molded section includes the step of sonic welding said first molded section to said second molded section.

13. The method of claim 9, wherein the step of securing said first molded section to said second molded section includes the step of snap-fitting said first molded section to said second molded section.

14. The method of claim 13, wherein the step of snap-fitting said first molded section to said second molded section includes the step of O-ring snap fitting said first molded section to said second molded section.

15. The method of claim 9, wherein said step of securing said first molded section to said second molded section includes the step of evacuating a quantity of air from said gapped area defined between said first molded section and said second molded section and hermetically sealing said first molded section to said second molded section.

16. The method of claim 15, further comprising the step of introducing an inert gas to said gapped area before hermetically sealing said molded sections together.

17. The method of claim 9, wherein the step of securing said first and second molded sections together further comprises the step of introducing a thermally conductive fluid to said gapped area defined between said first and second molded sections and forming a fluid tight seal between said first and second molded sections.

18. The method of claim 9, wherein said securing step includes the step of detachably securing said first molded section to said second molded section.

19. The method of claim 9, further comprising the step of providing an expandable foam to said gapped area defined between said first and second molded sections.

20. The method of claim 9, further comprising the steps of coating said resistance heating element with a UV curable material and curing said material after positioning said heating element between said first and second molded sections.

21. The method of claim 20, wherein the step of coating said heating element includes the step of providing said UV curable material to said gapped area defined between said first and second molded sections.

22. The method of claim 9, wherein said resistance heating element is a foldable resistance heating element, said supporting substrate having a foldable profile shaped to conform generally to a shape of said molded sections when folded, said method further comprising folding said heating element to conform generally to said shape of said molded sections.