US RE14743 E
Abstract available in
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Description (OCR text may contain errors)
E. J. BRYANT.
I PLUG GAGE.
APPuc/mou FFLED'FEB- a. 1911.
Reissued 0m 28, 1919. v 14,743.
gage having I amount of space.
i provide a plug vention will in RHODE ISLAND.
tion, reference being had to the accompany- 1n drawings. v
This invention relates broadly to tools, and more particularly to a plug gage for determinatlng accurately predetermined d1- of circular openi gs. The to pro uce an accurate plug interchangeable wear surfaces.
A further object of this invention is to. gage of such' construction as permits one andle to be interchangeable with the plurality of sets of gage heads.
Another object of this invention is to produce a plug gage of the double-end type having solid removable gage heads constructed to be fixedly and rigidly secured to the handle.
Still other and further objects of this inpart be obvious and will in part be pointed out by reference to the accompanying drawings, in which like characters are used to represent like parts throughout the several figures thereof.
Figure l is an elevational view showing a portion of the gage in section. Fig. 2 is a view illustrating one gage head detached from the handle. Fig. 3 is a perspective view showing the handle with the retaining screws in place. Fig. 4 is a view illustrating the other gage head detached from the handle. Fig. 5 is an end view.
The most common form of double-end plug ges, is a gage wherein the gage heads and t e handle are formed from a single piece of metal. In gages of this type each different pair of gage heads necessarily includes a handle, and consequently, the handle is multiplied as many times as there are gage heads, so that a set of gages of various sizes includes a considerable amount of unnecessary material and weight. Also a set of gages of this ty e occupies considerable urthermore, the period of usefulness of a gage head in a fixed gage is determined by the of the gage heads.
wear on the outer ends .pendicular to the axis of the grooves 6. The
. support 2, and a key-way relative lengths oft-he PLUG-GAGE.
Specification of Reissued Letters Patent. Reissued 1 28 1919 Original No. 1,186,075, dated June 6, 1916, Serial No. 3,049, filed filed February 3, 1917. Serial January 19, 191 5. Application for reissue No. 146,541. g
The invention, which will hereinafter be described in detail, comprises a plug gage wherein a single handle may be utilized to carry a number of removable heads of predetermined sizes. These heads are constructed in pairs and are ground to true cylindrical surfaces, so that the heads may be reversed upon the handle and thus provide a gage with substantially double the wear of a gage with a fixed head.
Referring now more particularly to the drawings, a body portion A is provided with a knurled handle 1, which terminates in a short cylindrical support 2 and a relatively longer cylindrical support 4. Accurately formed surfaces 5 lie in planes per- I of the cylindrical supports 2 and 4 and are carried below the said cylindrical surfaces to form one wall "outer ends of the body portion A are tapped 'to receive the cone-headed stub screws B, and are drilled adjacent the grooves 6 to receive the retaining pins 7. In gages of this character for measuring exact dimensions it is necessary to provide for a major dimension limit.
This is determined by forming one end.
of the gage to the exact mension, and designating this end as the Go end, which will pass work that fits the'head. While a very slightlyv larger diameter gage head is provided on the other end, and is designated as the Not go end. This end is used to reject such work as will receive this gage head. It is particularly desirable that the gage itself will unmistakably indicate which is the Go and which is the Not go end of the gage. In the present case the Go end of the gage is indicated by the longer gage head shown in Fig. 2, and comprises the solid metal hollow cylinder C which is provided withan opening 8 adapted to fit upon the long cylindrical support 4, and a keyway 9 constructed to fit'over the projecting end of the retaining pin 7 on the longer cylinder support 4. The Not go end of the gage comprises the short solid hollow cylinder D which is likewise provided with an opening 10 adapted to fit upon the short cylindrical 11 adapted to fit over the projecting head of the retainin pin 7 carried adjacent predetermined dithe support 2. The gage heads unmis a plane at right angles drawn or forced very takably distinguish the Go from the Not go end.
, Since the work faces are accurately ground to true cylindrical surfaces 12 and 14, res. spectively, and since the cylindrical supports 2 and 4; are true cylindrical surfaces that accurately 8 and 10, it is obvious that either end of the respective gage heads ma be secured adjacent the outer ends of the ody portion. Particularly is this true since each end of each gage head is fitted or ground to lie in to'the axis of the cylinder determining the work faces of the respective gage hea the small grooves 6 lying 1 adjacent the surfaces 5, permit the supporting surfaces 2 and 4 to be accurately ground their full length and also provides grooves for the reception of foreign matter of any character, thereby enabling the gage heads to be tightly against the surfaces 5, so that when the headsare in positionuupon the body portion A the entire gage is substantially were an integral piece of ables the user thereof to a gage head in a piece metal. This enof work with the same degree of positive determination as if.
the gage were formed with a single'piece of metal. Furthermore,
heads is abs lutely symmetricin eve 1- rection, with the slight exception 0 the key-way which is so slight as to be negligible; 'lhis uniformity of metal prevents any distortion of the gage surfaces due to molecular changing, either in aging of the metal after it has been hardened, or distortion due to temperature'changes. Gages of this character are used for extremely accurate work and security against molecular changes is of great importance.
Having thus described my invention, what I claim is 1. In a plug gage in combination, a body portion comprising a handle, supports formed on each end of said handle, stops on said handle in planes at ri t angles to the axes of said supports, the ody portion being provided with grooves adjacent said stops, solid cylindrical gage heads provided with openings to accurately fit said supports, the ends of said gage heads being 1n planes at right angles to the axes of the work faces. of said heads, said-heads being constructed to differentiate one from the other; and removable means to secure said heads in position on said handle.
2. In a plug gage in combination, a body portion comprising a handle, cylindrical supports formed on each end of said handle, said body portion being provided with shoulders comprising stop faces arranged at ight ang es t the axe of. said supp r fit v the respective openings I It will be noted that p in as rigid as if it.
feel the set of y it will be noted that the mass of metal carried by the gage ends constructed to abut against said stop the said handle.
said body portion being provided with circumferential grooves adjacent said stop surfaces andextending below the cylindrical surfaces of said supports, solid cylindrical gage heads provid d with openings adapted to fit said supports, one of said gage heads being relatively long and formed with. a cylindrical work surface having a diameter of a predetermined dimension, the other of said gage heads being relatively short and having a cylindrical work surface of slightly larger diameter than said predetermined dimension, and clamping means to secure said gage heads in position on said handle and against said stop surfaces.
3. In a plug gage,
handle, supports end of said handle, stops on said handle adjacent said supports, projections extending outwardly from said supports, cylindrical gage heads provided with to accurately fit said supports, said gage heads also provided with recesses to engage and interlock with said projections, both ends of said ga e heads being constructed to cooperate wit said stops in such manner that said heads are reversible to obviate weal, flat head screws extending into said supporting members and over the ds f a d gage h ad to. retain ai g ge heads in position upon said supports.
4. A hag gage comprising, in combination, a be y portion forming a handle, a cylindrical support formed on the end of said body portlon, said body portion being provided with a shoulder Constructed to com rise a stop face and arranged at right ang es to the axis of said support, said body ortion also being provided with a circumerential groove ad] acent said stop face and extending below a surface of said support, a cylindrical gage head providedv with an opening adapted to fit said support, said gage head being a substantially true cylinder of a predetermined diameter and having surface whereby either of the end surfaces of said cylinder may cooperate withfsaid stop reversed to obviate wear,. securely said stop and means to maintain said gage head against surface and firmly mounted'upon 5. A plug gage comprising, in combination, abody'portion adapted to form a. handle, a support on the end of said body portion, and a stop adjacent said support, a cylindrical gage head provided with an opening to accuratelyv t. said support,
means to prevent the rotation of said gage head relative to said support when sa1d age h ad sin position upon said support,
both end o aid gag e e ng c n tru ed to coiiperate with said stop in such: manin combination, a bodyportion comprising a formed on each surface to enable the gage head to be ner that said head may be reversible to obviate wear, and means adapted to maintain said head tightly against said stop when said head is operatively mounted upon said support.
' tion, a supporting handle,
6. A plug gage comprising, in combinaa support formed on the end of said handle, a cylindrical ga e head comprising a member having a su stantially true cylindrical work surface, said member being constructed with an opening of uniform cross-section extending from end to end of said member whereby said member is adapted to fit upon and be reversible with reference to said support, and retaining means operative adjacent the end of the ga head for rigidly clamping said gage he to said supporting handle.
7. A plug gage comprising in combina- Goples ,of this patent may be obtained for five cents each, by addressing the tion, a supportin r handle, a support formed on the end of sai handle, a cylindrical gage head having a substantially true cylindrical work surface, said handle being provided with a shoulder the plane of which is at right angles to the axis of the cylindrical surface of the age head, said head being constructed to [it upon and be reversible with reference to said support, and being provided with plane surfaces at right angles to the axis of the gage head, and retaining means for rigidly securing said gage head upon said handle and for tightly compressing one of said plane surfaceson the head againstthe shoulder on the handle, whereby the retaining forces act substantially parallel to the axis of said head.
ELMER J. BRYANT.
"Commissioner of Patents,
Washington, D. 0.