Claims
- 1. An apparatus for forming a plastic tube comprising: vertically disposed mandrel for insertion within the tube for vertically supporting the tube with the upper end of the tube disposed about said mandrel, and a pair of spaced and oppositely facing heating means for radiantly and simultaneously heating opposite sides of the upper end of the tube while disposed on said mandrel for heating said opposite sides of the tube at a higher rate than the remainder of the circumference of the tube whereby the upper end of the tube form a bulb of oval configuration upon being heated by said heating means.
- 2. An apparatus as set forth in claim 1 including mandrel carrier means for supporting said mandrel and for moving said mandrel into and out of said heat zone.
- 3. An apparatus as set forth in claim 2 including base means for receiving and positioning said carrier means.
- 4. An apparatus as set forth in claim 1 wherein said heating means defines a pair of spaced walls extending generally perpendicular to said mandrel and heat generating means disposed between said walls and spaced from said mandrel.
- 5. An apparatus as set forth in claim 4 wherein said walls include a top wall extending across the top of said mandrel and a bottom wall with a slot therein for receiving the upper end of said mandrel.
- 6. An apparatus as set forth in claim 5 wherein said heating means includes heat generating devices disposed between said top and bottom walls and spaced from the edges of said slot.
- 7. An apparatus as set forth in claim 6 wherein said slot is elongated and including a plurality of said mandrels for disposition along said slot whereby opposite sides of tubes disposed on said mandrels are heated by heat radiating from said heat generating devices.
- 8. An apparatus as set forth in claim 7 wherein said heating devices comprise elongated resistance heaters.
Parent Case Info
This application is a Divisional of application Ser. No. 743,038, filed Nov. 18, 1976, now U.S. Pat. No. 4,095,598.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
743038 |
Nov 1976 |
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