INSULATED BUS BAR AND METHOD OF MAKING

• US 3,600,802 A
• Filed: 06/26/1969
• Issued: 08/24/1971
• Est. Priority Date: 06/26/1969
• Status: Expired due to Term

• Current Assignee: George N. Jorgensen, Harris I. Stanback
• Original Assignee: George N. Jorgensen, Harris I. Stanback
• Inventors: Jorgensen, George N., Stanback, Harris I.
• Primary Examiner(s): Campbell, John F.
• Assistant Examiner(s): Rooney, Donald P.
• Application Number:
  US04/842,776
• Time in Patent Office: 789 Days
• Field of Search: 29/624 156/54,304,218,53 264/285,339 339/22B 174/5,91,92,93 18/19B,19E
• US Class Current: 29/885
• CPC Class Codes: B29C 63/04 by folding, winding, bending or the like
• CPC Class Codes: H01B 13/106 the conductor having a rectangular cross-section
• CPC Class Codes: Y10T 156/1038 Hollow cylinder article
• CPC Class Codes: Y10T 29/49224 with coating

Abstract

Methods of making insulated bus bars using flat, non-selfconforming insulating film as insulation. One or more strips of insulating film are fed through various work stations in which the strips are formed into a generally U-shaped cross section, heated on the inside of the U-shaped cross section, formed into a sleeve corresponding to the shape of a bus bar and having overlapping longitudinal edge portions, heated on the outside, cooled, and cut to length. A bus bar is then inserted transversely in the formed sleeve.

Claims

1. The method of making an insulated bus bar comprising providing a flat elongated bus bar of uniform cross section, providing an elongated strip of flat, non-self-conforming insulating film of a width somewhat greater than the perimeter of the bus bar cross section, feeding the strip successively through various work stations in which the strip is formed into a generally U-shaped cross section, heated by the directing of heat into the inside of the U-shaped cross section, formed into a sleeve of a cross-sectional shape and size corresponding to the cross-sectional shape and size of the bus bar with the bight portion of the U-shaped cross section becoming one of the wider sides of the sleeve and with the longitudinal edge portions of the strip overlapping along the other of the wider sides of the sleeve, heated by the directing of heat onto the outside of the sleeve, cooled while in the form of the sleeve, and then cut to a length corresponding generally to the length of the bus bar, and inserting the bus bar in the sleeve.

2. The method of making an insulated bus bar according to claim 1 wherein two strips of non-self-conforming insulating film are fed successively through the various work stations in superimposed relationship to provide a double-layered sleeve, and the bus bar is inserted into the double-layered sleeve.

3. The method of making an insulated bus bar according to claim 2 including providing two relatively narrow strips of insulating tape and feeding the strips of insulating tape through the various work stations between the strips of insulating film longitudinally thereof, the strips of insulating tape being spaced apart transversely of each other an spaced from the longitudinal edges of the strips of insulating film so as to be positioned along the narrower sides of the sleeve, respectively, upon formation of the sleeve.

4. The method of making an insulated bus bar according to claim 1 wherein the step of inserting the bus bar is accomplished by the unfolding of the sleeve at the overlapped longitudinal edge portions of the strip and the inserting of the bus bar transversely.

5. The method of making an insulate bus bar according to claim 1 including the additional step of punching longitudinally spaced apertures in the sleeve along a longitudinal edge portion thereof before the bus bar is inserted therein.

6. The method of making an insulated bus bar according to claim 4 including the additional step of winding a length of adhesive tape transverselY around the bus bar and sleeve at one end of the sleeve to retain the bus bar and sleeve against longitudinal movement relative to each other.