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US 5,131,795 AGranted
Screw threaded insert
AssigneeBollhoff GmbH
InventorKlaus Kobusch
Life of this patent
Estimating the term…
Abstract
A screw threaded insert adapted to be fitted in a bore of a workpiece made of thermoplastic material. The screw threaded insert is externally tapered at an angle of about four (4) degrees and is defined externally with a thread of approximately equal pitch and depth, and of saw toothed shape. The insert is also threaded internally for receiving a bolt. A pair of cutting slots is also provided.
Claims7
A threaded insert adapted to be installed in an unthreaded conical bore in a workpiece formed of plastic material, said insert comprising:
- a body having a conical outer face with substantially the same conical angle as the conical bore in the workpiece, said conical angle being approximately 4.degree., said conical outer face having formed therein fine sawtooth-shaped screw threads each having a substantially radial face and a conical face, said screw threads having a pitch and a depth which are substantially the same, and said conical outer face having a maximum outer diameter greater than that of the bore in the workpiece by an amount such that in installing the insert in the bore the spaces between the threads are substantially filled by the plastic material of the work-piece wherein the radial faces of the threads are disposed in the pulling out direction and the conical faces of the threads are disposed in the installing direction.
Dependencies are inferred from the claim text.