Patent · US Active

Plastic screw anchor for securing a rail to a railroad tie

US8814058B2 · kind B2 · utility

1Cited by

8References

10Claims

0Family size

Assignee

SCHWIHAG AG · CH

Inventors

Erik Danneberg · Zürich, CH
Tilman Peter Ruetzel · Konstanz, DE
Roland Buda · Bodensee, DE
Frank Meyer · Stockach, DE

Key dates

Filing date	May 25, 2011
Grant date	Aug 26, 2014
Priority date	—
Expiry date	Sep 18, 2031

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE01B9/18
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The invention relates to a plastic screw plug (6) for attaching a rail to a sleeper, in particular concrete sleeper, having an essentially cylindrical plug body which has at the head end a stem region (7) which preferably adjoins a plug crown (8) toward the bottom, and in the continuation of which stem region (7) has an outer thread (9) with which it can be turned out of or into the sleeper, and is provided with an inner thread (10) underneath the stem region (7) in order to receive a sleeper screw. The intention is to improve such a plastic screw plug, in particular, with regard to its operating properties such as uniform application of force into the sleeper, simpler mounting and replaceability, reduction of the risk of fracturing, and additionally to permit it to be used in a variable way. For this purpose, the stem region (7) has on the inside, in the junction with the inner thread (10), a shoulder (13) which reduces the internal diameter over part of the length of the stem region (7) and extends in a spiral shape over at least part of the circumference.

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