Plastic thread element and connection assembly consisting of a plastic carrier part and a plastic thread part
AssigneeBöllhoff Verbindungstechnik GmbH
InventorAlexander Vorderwisch
Life of this patent
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Abstract
A thread element mode of plastic, a connection assembly consisting of a support part made of plastic into which the thread element made of plastic has been screwed by creating a counter-thread, a method for manufacturing the connection as well as a method for manufacturing the thread element. The thread element is characterized by an axial piece on which the circumferential windings of a thread turn are interrupted by at least two chip flutes. The resulting winding areas form a cutting web and an inhibition web, whereby the cutting web extends radially beyond the inhibition web.
Claims19
A thread element made of plastic comprising an axial piece having a central axis and a thread turn of an outer thread circulating around the central axis in several windings, wherein the outer thread is adapted to form a counter-thread when being screwed into a receiving opening of a support part made of plastic, wherein a plurality of adjacent windings are interrupted at least over a part region of the axial piece by at least two chip flutes extending parallel to the central axis, so that each interrupted winding comprises at least one cutting web and one inhibition web in which a radial extension of the cutting web is greater than a radial extension of the inhibition web, wherein a core thickness of the axial piece perpendicular to the central axis of the outer thread is constant at least in the part region of the axial piece outside the longitudinal flutes.
Method for manufacturing a connection assembly comprising at least one support part made of plastic and a thread element made of plastic, the thread element of which has an outer thread and the support part of which has a receiving opening, wherein the method comprises the following steps:
- a. axial screwing-in of the thread element into the receiving opening,
- b. thereby forming a counter-thread in an inner wall of the receiving opening by means of a plurality of cutting webs in the outer thread, and
- c. creating a press fit in the formed counter-thread by engagement of a plurality of inhibition webs which comprise a smaller radial extension than the cutting webs and which are arranged separately from the cutting webs via a plurality of chip flutes.
Method for manufacturing a thread element made of plastic comprising the following steps:
- a. providing an injection mold formed complementary to the thread element, wherein the thread element comprises an axial piece having a central axis and a thread turn of an outer thread circulating around the central axis in several windings, and a plurality of adjacent windings are interrupted at least over a part region of the axial piece by at least two chip flutes extending parallel to the central axis, so that each interrupted winding comprises at least one cutting web and one inhibition web in which a radial extension of the cutting web is greater than a radial extension of the inhibition web, wherein a core thickness of the axial piece perpendicular to the central axis of the outer thread is constant at least in the part region of the axial piece outside the longitudinal flutes,
- b. injection molding the thread element and
- c. demolding the thread element from the injection mold.
Dependencies are inferred from the claim text.