Load-indicating washer

Patent metadata

Field	Value
Publication number	US-9316248-B2
Application number	US-201113882087-A
Country	US
Kind code	B2
Filing date	Aug 24, 2011
Priority date	Oct 29, 2010
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A direct tension indicator ( 2 ), including a base element ( 11 ) and a cover element ( 13 ) that is arranged on the base element ( 11 ) and at least one indicator element ( 4 ) that is arranged between the base element ( 11 ) and the cover element ( 13 ) in order to display an axial force acting between the base element and the cover element. The indicator element ( 4 ) includes a dilatant material.

First claim

What is claimed is:

1. A direct tension indicator comprising:
a base element;
a cover element arranged on the base element; and
at least one indicator element arranged between the base element and the cover element to display an axial force acting between the base element and the cover element, the indicator element including a dilatant material.

2. The direct tension indicator as recited in claim 1 wherein the base element and the cover element each have a through opening.

3. The direct tension indicator as recited in claim 2 wherein the two through openings are flush with each other to allow axial passage of a bolt.

4. The direct tension indicator as recited in claim 1 wherein the indicator element is configured as a ring.

5. The direct tension indicator as recited in claim 1 wherein the base element and/or the cover element include an annular disk.

6. The direct tension indicator as recited in claim 1 further comprising a stop limiting an axial movement of the cover element towards the base element and also limiting an axial load of the indicator element.

7. The direct tension indicator as recited in claim 6 wherein the stop includes a stop ring projecting axially from the base element or from the cover element.

8. The direct tension indicator as recited in claim 6 wherein at least part of the indicator element surrounds the stop.

9. A concrete anchor comprising the direct tension indicator as recited in claim 1 .

Assignees

• Appl Joerg
• Dijkhuis Arjen Detmer
• Schaeffer Marc
• Goldt Mathias
• Eckstein Andreas
• Hilti Ag

Inventors

• Appl Joerg
• Dijkhuis Arjen Detmer
• Schaeffer Marc
• Goldt Mathias
• Eckstein Andreas

Classifications

• F16B31/028 Primary

  with a load-indicating washer or washer assembly · CPC title

• F16B43/00 Primary

  Washers or equivalent devices; Other devices for supporting bolt-heads or nuts (circlips F16B21/18; {for indicating tensile load F16B31/02; forming a whole with the bolt or nut F16B33/00; locking bolts or nuts by means of a fixed plate or ring, or washer-like resilient plates F16B39/10, F16B39/24}) · CPC title

• F16B13/0858

  with an expansible sleeve or dowel body driven against a tapered or spherical expander plug (F16B13/004 takes precedence) · CPC title