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US 7,037,059 B2Granted
Self-tapping screw for composite materials
AssigneeAltenloh, Brinck & Co. GmbH & Co. KG
InventorRobert Dicke
Life of this patent
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Abstract
In accordance with an embodiment of the invention the threads of the two thread sections have an opposite pitch. Further, chips are reduced in that the tip of the screw near the thread section has been configured as a multiple screw-thread, in particular a double screw-thread, where the pitch of the threads of the multiple screw-thread is greater than the pitch of the single screw-thread of the thread section near the head of the screw.
Claims11
A self-tapping screw comprising:
- a screw head;
- a screw shaft adjacent to the screw head;
- a screw tip;
- and
- wherein a first and second thread sections have been formed on the screw shaft and are separated by a thread-free section, and the threads of the first and second thread sections having an opposite pitch, and wherein an outer thread diameter of the first thread section near the screw head is smaller than an outer thread diameter of the second thread section near the screw tip and where the first and second thread sections have the same root diameter.
2 more elements
Dependencies are inferred from the claim text.