Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Means joining flexible indefinite length or endless bodies...
Patent
1987-10-16
1989-01-31
Wityshyn, Michael
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Means joining flexible indefinite length or endless bodies...
156158, 1563042, 1563046, 156507, B29C 6520
Patent
active
048013498
ABSTRACT:
The invention is a method and apparatus for butt-welding two adjoining plastic tubular members which are held in axially adjustable mountings and which are joined together under axial pressure after heating in the area of their juncture by means of electric heating elements. Welding without formation of an interior bead is made possible with the invention by inserting into the plastic tubular members, prior to heating, a bolster which bridges the juncture and fits flush against the inside curvature of the plastic tubular members, and by applying in the area of the juncture shell-shaped heating elements to the outside of the plastic tubular members to heat the abutting ends of the plastic tubular members from the outside.
REFERENCES:
patent: 3022209 (1962-02-01), Campbell
patent: 3635504 (1972-01-01), Borden et al.
patent: 3660192 (1972-05-01), Smith et al.
patent: 3666586 (1972-05-01), Lacey
patent: 4636272 (1987-01-01), Riggs
patent: 4675965 (1987-06-01), Offringa et al.
Dommer Armin
Dommer Dieter
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