Patent · US Active

Thread-tapping screw

US7740435B2 · kind B2 · utility

8Cited by

7References

4Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Peter Gstach · Bludesch, AT
Berthold Aumueller · Grafenau, DE

Key dates

Filing date	Oct 30, 2008
Grant date	Jun 22, 2010
Priority date	—
Expiry date	Jan 1, 2029

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16B25/0052
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A thread-tapping screw (11) has a thread (21) extending, starting from the screw shaft free end (15), at least along a portion of the shaft length and a height of which constantly decreasing toward the free end (15) of the shaft (12), and a plurality of cutting bodies (26, 36, 46, 56, 66) formed of a material having a greater hardness than hardness of the thread (21), located in recesses (24) formed in the thread (21) and opening radially outwardly and having, respectively, a radial outer profile (27, 37, 47, 57, 67) projecting, at least partially, beyond the thread and a height (A, B, C, D, E) of which decreases toward the free end (15) of the shaft (12) stepwise.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.