US2443904A

US2443904A - Thread ring gauge

Info

Publication number: US2443904A
Application number: US567069A
Authority: US
Inventors: Fishman Bernard
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-12-07
Filing date: 1944-12-07
Publication date: 1948-06-22
Anticipated expiration: 1965-06-22

Description

June 22, 1948; B. FISHMAN 2,443,904

. THREAD RING GAUGE Filed Dec. '7, 1944 Ill .1

INVENTOR.

BERNARD F-ISHNAN Patented June 22, 1948 I manner) RING crane-E. d e nard lish Brbp rn npplication fiecember 7, 1944,- Serial-No;567,1)69

'fI his invention relates rte-mew and useful improvements in a thread Ming :gage.

More specifically, it is proposed toprovide a "threadring gage previded-=with:means increas ing the lif'enf the gage.

Still further, itis proposed to provide a thread ring ---gage--having means for reducing the variation in diametenof ,thethreadalong the width of the gage aswear takes "place.

Anoth robjectistoepr vid threadrl er a having an unthreaded centenfi Still another objectis.toproyidea ,thread ring gage having a grooved center.

Adunther object is togmmz'ide a threadtming rgage itormedof three pantsisecnred togethersthe My .two .outenparts .being .threadedrand the ='center part being smoothand havingta larger inside diameter forming, between the threaded parts, a center groove.

Forfurther -eompnehens ombe the invention, :and of the-objectsland. advantages thereofrefer ence will be had to the following description and accompanying drawings, and to the appended claim in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a thread ring gage constructed in accordance with this invention.

Fig.2 is an enlarged section on the line 2-2 of Fig. 1.

Fig. 3 is a view, similar to Fig. 2, of a thread ring gage constructed in accordance with a modification of this invention.

Fig. 4 is a front view of a thread ring gage constructed in accordance with a further modification of this invention.

Fig. 5 is an enlarged section on the line 5-5 of Fig. 4.

Thread ring gages of conventional well known types are threaded from one side of the gage to the other. It has been found that, from continually threading a member into the gage from opposite sides thereof that the threads are subject to wear. This wear in the diameter of the gaging surface is not uniform, however, throughout the width of the gage. In the go gage, the wear will be greater at the sides than at the center. In the not go gage, the wear will be limited to the first two or three threads in from both sides. The result of this variation in wear is that the threads in the center. of the gage will be smaller in diameter than the threads at the sides. This type of gage is adjusted to compenaQlaimwhe -slaw sate for .wvear by "decreasing the diameter of the ring, gage, :the ring being: split and provided with suitable .radjustingyandlocking mechanism for this purpose. The present invention is directed toward sproviding. .a, thread rring :gage ,in which the .center threaded portion .cigreater-,gdiameter cannot rform, thus greatly plengtheningthe F ifa of therg-age.

A rthread ring gage constructed ;in;accordance with zthiszinventiontis shown inJFigs. :1 andz ,and

indicated. generally by zth reference :numeral, t0

:Thistgage. :m-icomprisesya split rin ody lit split 'or gap I12 ,or awhichis radial. 'I'hegage is adjusted. and set lby-g-means :of. .angadl'usting screw sleeve EM, and locking screw 15.

T esa also has one or two adjusting slots 2| and; adjustingrslotiterminalholes 5m. 7 The ring gagedias (EH1 :aXia1:1fhOI'eJ'5,TWhlCh contains the, gaging threads. This bore is providedwith a oircurn- :af'erential .;or.;annular;center .or :inn I -QQVG' l1. 1' The bDIjfilhESsthG gaging threadscut :in marginal sections flanking the undercut channel or groove H, the threads being indicated on one side by the numeral I8 and on the other by the numeral I9.

The operation of the device is as follows:

When the ring gage is new, the threads I8 and 19 are of the same diameter. In use, the gage may be employed from either side, depending upon the convenience of the user. After extensive use, however, the threads l8 and I9 tend to wear and increase in diameter. Such increase may be compensated for by an adjustment of the adjusting screw l3, thus restoring the gage to the correct size.

However, as the outer threads of I8 are used more than the inner threads, and as they are subjected to greater wear, the row of threads I3 tend to wear conically with the outer threads wearing the most. The same is true of the threads [9. However, due to the relatively short width of the threads [8, this conical wearing does not interfere with the accurate gaging by the ring, and the same is true of the threads l9. This is due to the groove H which, by eliminating center threads in the ring, separates the two sets of threads, decreases their width, and prevents any appreciable variation in the diameter of the thread along the Width of the gage. This permits the extended use of the gage even though the threads 18 and H! are wearing, and permits adjustment by the adjusting device to take up this wear. The importance of the groove I! may bebest understood if it is considered that were no groove I! provided, then the threads l8 and [9 would meet at the center of the ring. These center threads would be used least of all the threads on the go gage, and not at all on the not go gage, and would consequently receive little or no wear but would remain their original size while the threads l8 and I9 increased in diameter.

Eventually the center threads would be of such a different diameter from the threads on either side thereof that, in adjusting the ring with a male plug gage, the user would be threading the plug gage into a cone of considerable length and would therefore not be able to get an accurate setting, the plug gage setting the ring gage ac cording to the center unworn threads and not according to the threads (18 and 19) to be used.

A thread ring gage H3, constructed in accordance with a modification of this invention, is shown in Fig. 3. It distinguishes from the gage H3 in that, instead of having the groove l1, it

has an unthreaded portion H which acts similarly to the groove 11. Other corresponding parts are indicated by like references with an accent added.

A thread ring gage l0" constructed in accordance with a further modification of this invention, is shown in Figs. 4 and 5. As a finished ring, it performs similarly to the ring l0. It distinguishes therefrom in that the threads l8" are in a ring member [8 the threads [9" are in a ring member [9 and the groove I1" is formed by a washer llof larger inside diameter than the members 18 19 The members l8, l9 and washers ll are secured together by countersunk screws 22 and dowels or by any other suitable manner.

It is to be understood that the cross sectional shape and width of the annular groove I! may be varied as desired.

While I have illustrated and described the prefer-red embodiments of my invention, it is to 4 be understood. that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claim.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

A thread ring gauge, comprising a pair of identical split rings having precision internal screw threads of a constant pitch and continuous helix, a split ring disposed between the two rings and having an internal diameter considerably greater than the internal diameter of the two rings first named, screws connecting the rings in concentric relation to each other, the rings having radial slots registering with each other and located between the screws, and male and female screws extending through the last-named split ring to constrict or expand the diameter of the first-named split rings, the thickness of the last-named split ring being no greater than the thickness of the first-mentioned split rings and its'internal wall surface being concentrically spaced from engagement with a screw to be checked by the ring gauge.

BERNARD FISHMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,433,528 Bryant et al. Oct. 31, 1922 1,874,517 Hartness Aug. 30, 1932 FOREIGN PATENTS Number Country Date 3,461 Great Britain 1913 635,703 Germany 1936