US 6,129,805 AGranted

Method of and apparatus for welding mitered mating surfaces of frame sections

AssigneeSchuco International KG

InventorManfred Valentin

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Abstract

A method of welding mitered surfaces of frame sections made of plastic material and having incorporated therein a seal of weldable material extending along the frame sections and composed of an attachment foot and at least a sealing lip, for use in windows or doors, includes the steps of heat-welding mitered surfaces and adjoining frame section zones by means of a heated mirror while covering during welding operation an inner contour of the seal by at least one form-part that is positioned in and neighboring the miter plane and has a contour which substantially complements the inner contour of the seal. Subsequently, after removing the heated mirror from the miter corner and withdrawing the form-part the area of the seal, the mitered surfaces of the frame section are squeezed together.

Claims3

Dependent claims

comprising the steps of:
heating mitered surfaces of adjoining frame section zones by means of a heated mirror to a welding temperature;
removing the heated mirror from the area of the mitered surfaces;
moving at least one form-part that is positioned in and neighboring the miter plane and has a contour which substantially complements the inner contour of the seal formed by the sealing lip and the attachment foot adjacent to the seal so that the contour of the form part bears against the inner contour of the seal which is substantially covered thereby;
pressing the mitered surfaces together;
and
retracting the form-part from the inner seal after welding.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/234,211Filed 20 Jan 1999 · continuation
Priority: DE 196 44 18324 Oct 1996
Granted: 10 Oct 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B29C 65/20
Using heated tools: with direct contact, e.g. using "mirror"
B29C 66/1162
Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area: single bevel to bevel joints, e.g. mitre joints
B29C 66/326
Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr: shaping the burr, e.g. by the joining tool
B29C 66/52431
For forming corner connections, e.g. for making window frames or V-shaped pieces: with a right angle, e.g. for making L-shaped pieces