Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1014741 A
Publication typeGrant
Publication dateJan 16, 1912
Filing dateJul 9, 1909
Priority dateJul 9, 1909
Publication numberUS 1014741 A, US 1014741A, US-A-1014741, US1014741 A, US1014741A
InventorsLawrence E Barringer, Gilbert Wright
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Inclosed-fuse indicator.
US 1014741 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


I mcLosEp FUSE mmcuon.

Patented Jan. 16, 1912.

I Inventors: LawrenceEBaT'r'm Witnesses:

. g V Gilbertwri 111, 1% w w b8 Mm 1 I I t ,5.



Specification of-Letters Patent. A

Patented Jan. 'ifigittii.

Application filed July 9, 1909. Serial No. 506,739.

To all 7.0710721 it may concern:

Be it known that we, LAWRENCE E. Baa RINGEK and GILBERT \VRIGHT, citizens of the United States, residing at Schenectady, county of Schenectady, State of New York, have inventedv certain new and useful Improvements in Inclosed-Fuse Indicators, of which the following is a specification.

The present invention relates to thermal cut-outs, and more especially to the indicating means for inclosed fuses whereby the condition of the main element'of the fuse is'made visually apparent on the outer surface of the casing.

The object of our invention-is to provide an indicator of this character which will positively perform its function and produce a clearer and more distinct indication. than devices of this character heretofore in use.

In the accompanying drawing, Figure 1 shows in partside elevation and part section an ordinary inclosed fuse with our indicator attached thereto; Fig. 2 is a magnified section of the indicator and adjacent portion of the fuse casing; Fig. 3 is a plan view of theindicator before operation; and Fig. 4 is the same after operation.

The fuse shown in the drawing consists of a casing having a central tube 1 of fiber with its ends incl'osed by metallic caps 2 through which extend the contact blades 3, to the inner ends of which the main fuse element 4 is connected. An auxiliary fuse ele ment 5 extendsalong the inner surface of the casing connecting the end contacts 3'in' multiple with,..the main element 4, and the middle portionof the auxiliary element 5 is threaded through small apertures .6 in the wall of the fiber tube 1 and across a recess or chamber 7 formed in the outer surface aperture 10 through which the indicator 8 is normally seen, as shown in Fig. 3.

The indicator consists of fibrous material, such as rice paper, which has been treated thereof, we apply a flexible non-hygroscopic coating 12, such as collodion, to the treated fibrous material. Thiscoat-ing 12 maybe applied either by dipping or spraying or pouring over the fibrous material a solution of collodion.

p In order to render visually apparent whether or not the coating material has been properly applied to all parts of the fibrous material we discolor the coating material by means of a die soluble therein such as malachite green.

p The object of providing the recess or chamber 7 in the fiber tube beneaththe auxiliary element- 5 is to afford a supply of air to the inner surface of the indicator as well as to the outer surface and at the same time prevent conduction of heat from the external portion of the auxiliary element.

We do not desire to restrict ourselves to the particular constituents or arrangement of parts herein described and shown,,since.

it is apparent that they may be changed. without departing from our invention.

Whatwe claim as new and desire to secureby Letters Patent of the United States, is, I i

1. A fuse indicator comprising fibrous material coated with a readily combustible and non-hygroscopic material.

, .2. A combustible indicator comprising sheet of fibrous material coated with collodion.

3. A combustible indicatorcomprising a sheet of fibrous material chemically treated and coated with collodion.

4. A combustible indicator comprising sheet of fibrous material trea ted in. oxidiz ing" salt and then coated with a readily comwith said auxiliary fuse and extending over 10 bustible and non-hygroscopic material. said air chamber.

5, A combustible indicator comprising a In Witness whereof, We have hereunto set sheet of fibrous material treated in oxidizing our hands this 7th day of July, 1909. salt and then coated with collodion. LAWRENCE E. BARRINGER.

6. All inclosed fuse-having an air cham- GILBERT WRIGHT. ber formed in the outer Wall, an auxiliary v VVitnesse's: fuse member crossing said air chamber, and BENJAMIN B. HULL,

a combustible indicator disposed in contact HELEN ORFORD.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3041427 *Apr 14, 1960Jun 26, 1962Nuclear Corp Of AmericaBlown fuse indicator
US6114941 *Dec 4, 1998Sep 5, 2000Alliedsignal Inc.Thermal switch with activation indicator
US6373370 *May 16, 2000Apr 16, 2002Cooper TechnologiesSputtered metal film fuse state indicator
US6456189 *Nov 28, 2000Sep 24, 2002Ferraz Shawmut Inc.Electrical fuse with indicator
US6480091 *Jun 16, 2000Nov 12, 2002Honeywell International, Inc.Thermal switch with activation indicator
US6566996 *Mar 29, 2000May 20, 2003Cooper TechnologiesFuse state indicator
US6809627Jul 31, 2002Oct 26, 2004FLEXcon, Inc.Fuse indicator label
US6946947 *Feb 18, 2003Sep 20, 2005Sturgill Edward GPlug-in fuse
US7369030Sep 8, 2004May 6, 2008Cooper Technologies CompanyFuse state indicator
US7405646 *Jun 26, 2002Jul 29, 2008Littelfuse, IncMultiple conductor indicator
US7592893 *Jun 24, 2008Sep 22, 2009Littelfuse, Inc.Multiple conductor indicator
US7636028Jul 20, 2006Dec 22, 2009Littelfuse, Inc.Diagnostic fuse indicator including visual status identifier
US20030011462 *Jul 31, 2002Jan 16, 2003Castonguay Roland J.Fuse indicator label
US20040000983 *Jun 26, 2002Jan 1, 2004John KennedyMultiple conductor indicator
US20050280497 *Jun 16, 2005Dec 22, 2005Ackerman John MFuse with metallic state indicator
US20060049911 *Sep 8, 2004Mar 9, 2006Darr Matthew RFuse state indicator
US20070018775 *Jul 20, 2006Jan 25, 2007Littelfuse, Inc.Diagnostic fuse indicator including visual status identifier
U.S. Classification337/243
Cooperative ClassificationH01H85/30