US1571641A

US1571641A - Gauge for determining internal diameter of elements being ground

Info

Publication number: US1571641A
Application number: US686938A
Authority: US
Inventors: Pratt Frederick Jackson
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-01-17
Filing date: 1924-01-17
Publication date: 1926-02-02
Anticipated expiration: 1943-02-02
Also published as: FR604834A

Description

Feb.- 2 ,1926.

' T F. J. PRATT GAUGE FOR DETERMINING INTERNAL DIAMETER OF ELEMENTS BEING GROUND Filed Jan. 17, 1924 Patented at. .2, i92

UNITED STATES PATENT OFFICE.

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-Applioation filed January i7, i924. Serial No. 086,988.

I same, reference bein had to the accompanying drawings, whic form apart of this specification. My inventionrelates to a gauge for automatically measuring the bore or internal diameter of an element being ground.

One object of the preserit'invention is to provide a device which will insure accuracy of measurement throughout the entire length of the element calipered while 'the latter is being round to size.

\ A further ob]e ct of the invention is to increase production due to the speed with which-articles may be ground without stopping the grinding machine to take measurements. I.

A further object is to provide a device so constructed and mounted that it may main.- tain its proper relation to the article being ground throughout the entire period of grinding.

A further object of the invention is to provide a device which may be 'swungout of the way to remove or replace the article to be ground.

A further object of the invention is to provide against any appreciable wear even after long periods of service in traversing the bore or element calipered,-by

employing diamonds, sapphires, or other gem stones for the stylus points.-

One object in constructing the stylus points of diamonds' is that they may break through the fluid film covering the surfaceof the element being ground that an exact measurement may be obtained without cutting or scratching the surface measured.

A further object of the invention is to provide a device which is readily adjustable to meet the requirements of different articles to be calipered. a

With the foregoing and other objects in view which will appear as the description proceeds the invention further resides in the combination and arrangement of parts and in the details ofconstruction hereinafter described and claimed it being understood that changes may be made in the precise embodiment of the invention herein disclosed without departing from the spirit of the same. L In the drawings accompanying this specification:

Fi re 1 is an end elevation of the device attac ed to a grindingimachine showing the article to be, ground in contact with the rindin wheel,indicated in dash and otted lines.

Figure '2 is a plan view offthe device,

with the dial indicator removed, secured to a fragmentar portion of the frame of a grinding mac ine as it would appear when .measuring the here or internal diameter of an element being ground,a fragment of 75 which is shown in cross-section.

Figure 3 is a plan and sectional view of the device taken on or about line 3-3 of Figure 1, indicating the stylus arms of the gauge swung out of operative position 5- showlng a fragment of the grindin machine and sectional view through the article being ground,as in Figure 2.

Referring now to the letters of reference placed upon the drawin s:- 1 a -A, designates a grindin machine, B,-denotes a grinding wheel, an article being ground and calipered.v

D, represents a pulley and E indicates the driving belt.

F, denotes a bracket bolted .to the frame of the machine and G designates a socket member pivoted at F to the bracket adapted to receive a standard or red G, secured in the socket member by a set screw 9;

G denotes an arm integral with the socket member, slotted at its lower endjto receive a bolt G screwed into the bracket F.- G indicates a spring sleeved upon the bolt adapted tobear upon the arm G to normally restore the rod G to a vertical or predetermined position. G represents an adjustable set screw extending through the arm G adapted to bear upon the bracket to limit the movement of the rod under the urge of the spring G H, designates a divided clamping'member adjustably secured to the upright rod G, by a bolt H.

Extending transversely clamping member H, and secured thereto by a bolt H is a bracket arm I, provided at through the one. end with a, yoke; I in' which issupported by 'a pair of adjustable pivot screws J, .J, a bracket K having a forwardly extending arm K, and'.proj ect ing from upper face adjacent 1ts end is a lug K adapted toreceive-fa swin in yoke arm L, pivoted to the bracket pivotal bolts L, L,the outer .end of they a pair of gyoke arm L, being formed with a divided Q bearing -u on the inclined or beveled "walls of thes o'tted arm R, represents a diamond or em stone mounted in the end of the arm ,-:wh1ch is adapted to contact with the periphery of the element to' be ground.

' upon the peripheryof the work The lower end of the bar M, is fitted withfa divided clamping blocks, adapted to receive a bar T ad ustable therein on theforw-ard end of which is mounted a-slotted arm T, adju'stably secured to the bar bya set screw. T".

-R", denotes a diamond or gem stone set in the end of the slotted bar T to impinge emg ground.

U, represents 'abracket member clamped to the upper end of the bar M by a bolt U having an arm U to which is clamped an indicating dial W, of usual construction,

the depending finger W of the indicating dialcontrolling the movement of the swing ing pointer W?- which bears upon an arm X, having a oke-"shaped end X pivoted to the bracket {1, bya pair of pivotal screws Integral with the arm'X, is an extension )0, adapted to support an adjustable slotted arm Y, to which. it is secured by a .set screw Y".

- R", denotes a gem stone-fitted to the endof the slotted ar Y, to impinge upon the periphery of the work to be calipered.

For the sake of convenience the device may be said to consist of asupport, an adjustable frame on the support comprising the bracket arm L. yoke member I, bar U and vertical standard M on which the arms carrying the gems are adjustably mounted, the member N'being capable of oscillation .in the yoke member to swing the adjustable arms toward and away from the work;

Having now indicated the several parts by reference letters the construction and operation of the device will be'readily understood.

A template or master element (not shown) upon the. periphery of the element mounted in the grinding machine. The grinding gauge is then adjusted to the position indicated in Figure 1-, in which the oppositely disposed diamond points R and R", supported respectively by the arms T and Y, may impinge .upon the inner surface ,ofthe template on a plane intersecting its longitudinal axis,the arm Q being adjusted so that the gem stone R, will impinge upon the internal periphery of the template, midway between the gem stones R and R". In adjusting the gem stones to impinge upon the periphery of the template, care should be exercised to insure the rotatablepointer W of the dial indicator W, re 'istering at zero,it being evident that w en the element to be groundds inserted in the grinding machine in place of the template the pointer will move from ..of predetermined internal diameter is first.

its zero position to a point'indicating the relatlvely smaller diameter of the element to be ground.

The gauge having been properly adjusted thefdevice is swung horizonta y upon its pivotal support J, J, to the position indicated 1n Figure 3,the template is then removed from the grinding machine that it may be replaced by the element to be ground. The gauge is then returned to its former position, as indicated in Figures 1 and 2. Power is then applied to actuate the grinding machine,the operator taking careful note of the dial indicator reading as it -of the template. The gauge supporting frame-is then again swungto the position indicated in F1gure'3- that the element ground may be removed to be replaced by another element to be ground-whereupon the operation just described is repeated.

To maintain the gem stone R carried by the arm Q in impinging relation with the periphery of the element bein ground the spring (ir mounted upon t e bolt G screwed in the bracket F, is adapted to bear.

upon the depending arm G integral with the socket G in. which the upright rod G is mounted. The action of the spring causes the rod G to tilt causing the. arm Q to move laterally that its gem stone B may im inge emg ground as the diameter of the bo e is graduallyenla g g g ind ng The ada frame comprising a plurality of adjustable elements connectedtogether to form a unitary structure including a plurality of independently adjustable armsi secured 'to the frame at one end, means connecting the arms to the frame for oscillation into and out of an element to be internally ground, a gem stone mounted adjacent the other end of the respective adjustable arms and adapted to impinge. upon the internal periphery of the element being ground, resilient means adapted toact upon the frame, whereby the gem stones may beheld in impinging contact with the surface ofsaid element while being ground, an indicating device and means for actuating, the indicatin device, whereby a gauge reading may be 0 tained to determinechanges made in the diameter of the bore of the element being ground while being acted upon by a rinding wheel.

nal diameter of an annular element while thesame is being ground, means attached to a grinding machine for supporting a frame, a frame vertically adjustable upon said supporting means and including, an oscillating member, a plurality of arms, vertically adjustable upon the oscillating member, elongated members adjustably'carried by said arms fitted with gem stones and adapted to bear-upon the periphery of the bore of the 1 annular element, a dial indicator, and means for actuating the indicator, whereby a gauge reading may be obtained to determine 'changes made in the diameter of the bore of the annular element while being ground.

3. In a device of the character described, a bracket adapted to be secured to the frame of a grinding machine; a standard pivoted to the bracket provided with a depending arm; a bolt pro ecting from the wall of the bracket extending through an opening in the arm; a spring mounted upon said bolt adapted to bear upon the arm to tilt the standard; means for limiting the tilting action of the standard; a yoke-shaped element v'erticall adjustable upon saidv standard; an oscil atingframe ivoted in said yokeshaped element including awertically disposed member; a plurality of adjustable arms secured to said vertically dis osed member; bars adjustable laterally o and secured'to said adjustable arms, the said-bars having a gemstone fitted to one end of each bar and adapted to impinge upon the inner wall of an annular element to be ground;

a dial indicator and means actuated by one of the adjustable arms, whereby a gauge reading may be obtained of the internal ele- 'ment while it is being ground. 2. In a device or determining the inter- 49In a device of the character described, a standard, a framemeans connecting said frame and said standard said frame including a vertical rod, an being capable of oscillation on said connecting means toward and away from the work, a plurality of independently adjustable I arms on said'rod, and means on the adjustable arms for en-' gaging the interior of the work while being ground. I a v In testimony whereof, I sign this specifi- I cation.

FREDERICK JACKSON PRATT.. i