Patent · US Active

Screw tensioning device

US9248532B2 · kind B2 · utility

13Cited by

15References

8Claims

0Family size

Assignee

WAGNER VERMÖGENSVERWALTUNGS-GMBH & CO. KG · DE

Inventors

P. H. Wagner · Much, DE
Bernd Thelen · Much, DE

Key dates

Filing date	Nov 21, 2013
Grant date	Feb 2, 2016
Priority date	—
Expiry date	Nov 21, 2033

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25B29/02
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The screw tensioning device comprises a support tube (12), a cylinder member (15) and a piston section (17). The piston section serves for moving a tensioning bolt (20) screwed onto the thread of a threaded bolt (31). Provided according to the invention is a depth measuring device (35), which presents an externally visible indication of the screw-in depth (ET) of the threaded bolt (31). This ensures that, when the threaded bolt (31) undergoes extension under strain, there is a threaded engagement with the tensioning bolt (20) along a sufficiently long distance. This avoids the hazard that the screw tensioning device might break off from the threaded bolt.

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