US2603920A - Honing device - Google Patents

Description

y 1952 G. F. WAGSTAFF 0 HONING DEVICE Filed Oct. 4, 1948 2 Sl-IEETS-Si-EET 1 Inventor @zai FMiJ ZFF At iomn y 1952 G. F. WAGSTAFF 2,603,920

I HONING DEVICE Filed Oct. 4, 1948 2 SHEETSSHEET 2 /n ventor A ttorn eys Patented July 22, 1952 -t- BORING DEVICE George Frederick wagstafi, Oheltenham, England, assignor to Delapenafb Son Limited, i 'Ch'eltenharfiJiIngland 1i ApplicationOct oberd, 1c ia seiai Ni m GreatiBritain October 6, 1947 f j] d 'Ihis invention relates is to devices used for finishing components where a superlative finishis required and/or where the diameters have to be held't-o very fine limits. "It

is concerned with honing devices employed' for finishing external surfaces of revolutionf'for example the surfaces ofpins, plug gauges or the seams. (c1.'s1 1 s 4.1

to honing devices, that prisesa body I!) which maybe held in the. hand around the workwhile the latter is rotated --'or 'jwhich may be mounted in the jaws of a chuck and rotated while the work 'is heldwstationary. The bo dy consists mainly 'o'f'two' jaws H, i2, re-

' duced at one end to form hinge member'sl'la; 12a which receivea hinge pin l3 by which the jaws like, and referred to herein'as external hones.

j The'invention has for its object to' provide a new orjir'nproved construction of, external hone which is simple and economical in production and" the use of which will ensureaccuracy of the work producedparticularly as regards the removal of any trace of ovality which may have been left, for example, by the previous grinding or fine machining operation.

According to one aspect of theinvention'an external hone comprises guide means adapted to bear against the surface of revolution'ofthework at at least three points, and an abrasive element "adapted to be brought to bear againstsaid sur- Y face of revolution at a point substantially di- "ametrically'opposite one of said points.

In accordance with another aspectof the invention the external hone comprises anjabrasive element arranged to bear against the surface of revolution of the work at a point substantially diametrically opposite one of a plurality of guide 'members'and a movable support to hold the work between said plurality of guide members. 7 I I In certain constructions of external hone according to the invention some or all of said guide means or members may also take the form of abrasive elements but normally they will 'merely comprise members so arranged as to provide guiding and bearing surfaces for'the work as it "rotates relativelyto the hone. V Three embodiments of the invention will now "be "described, by way of example, with reference to'the' accompanying drawings, in which;

U Figure l is 'a front elevation of an externalhone according to the invention, a'portion of one of the jaws being broken away to show the movable s pp rt.

Figure 2 is an end elevation of the hone illus 'trated in Figure 1, r

Figure 3 is a front elevation of a modification of the hone illustrated in Figure 1, showing a different arrangement of the screw and nut mechanism and movable support, and

are pivoted together, the latter-being of bowed form so that with their free ends Il-b, I2b more or less close together, a substantially circular aperture 14 is". defined between thejaws to accept fjthe worki The upper jaw-I 'l is" formed at apoint intermediate it'sfends withan inwardly'disposed s1otfl5' to receive a block ldw'hich projects into the apcrture"l4 and is bifurcated to form'a: pair crgume membe s l1; "Ila; disposed in V relation to each other. The guide-block l6 is'rigidly rescrew l8. I I

A movable support in the form of a pawl-like member [9 'is pivotally' mounted at one of its ends to the free'end l2b of the lower jaw l2 by means of a pivot pin 20,'the jaw being gapp'ed to receive such end of the pawl-like member. The other end or nose l9a of the latter projects into the aperture M at a point such that, with the work projecting into the aperture (as indicated. in broken lines), the guide members-H,

' I La lie on one side of a diametenof the work parallel 'toa'c'hord'drawn through thepoints 'of contact of the "guide members'll, Ha with'the work while the nose 19a of the 'pawl-likemember lies on the other 'side'l As illustrated, the

pawl-like member isarranged so that the guide members l1, Ila are disposed substantially -sym-.

metrically with respect to the nose Illa of the ine'ans'of a aserew'zq, l

The abrasive'element' 2'l j 'is arranged at a point i'fdiametrically opposite the guide member I! of the bifurcated block. A headed screw z fiipasses Figure 4 is a similar view of a further modification of the hone, illustrating a different arrangement of the abrasive element and movable support. Referring to Figures 1 and 2, the'hone comthrough a clearance hole in a trunnion block 25 pivotally mounted in the free end ill) of the jaw II, which is gap-pod to receive the screw, the point of the latter passing througha clearance hole in the pawl-like member l9 and threading 'into a trunnion block 2,1.pivotally' mounted therein] Thereby tightening of the screw 25 first tined in its slotj'in th'e'jaw by meansof -a-set draws the nose 19a. of the pawl-like member in wardly of the aperture [4 between the jaws until it bears upon the surface of the Work and holds the latter between the guide members l1, I'm. Thereafter continued tightening of the screw 25 draws the .free end 1-21) of the-lower jaw l2 to which-the pawl-like member [9 is jpivoted towards the free end I lb of the upper jaw l l, with the pawl-like member acting as a lever and .its nose [9a the fulcrum, until the abrasive element 2] is brought to bear against the surface of the work. I

With this arrangement the abrasive element 2| is mounted in the lower jaw l2 so that its distance from the screw trunnion block 21 is greater than that of the nose l9 a of the'pawl-likemem V ber. Thereby, due to the increased leverage, upon tightening the screw 25 the abrasive element 2| will always bear harder on the surface of the, work than will .thenose 19a. .ofthe .pawlllike 1member.- This 'iS'ZOf importance as it enables the .o.perator to ;get the feel of the out .which the abrasive elementis Tputting upon .the' work.

:Intorder to maintain the Jaws .Ll, .I.2.and pawllike member [9 against collapsea compression ueoil :spring 2 8 is disposed around thescrew .25

:with its ends abutting the trunnion blocks 2&,.2l. ..-;l'-.igurev 3 illustrates an alternative arrangetion a body including two jaws pivoted together towards one end for relative angular movement .to define a variable aperture therebetween and having spaced guide surfaces adapted to bear 'unyieldingly at angularly spaced points against a surface of revolution of work placed within said aperture, asupport pivoted to said body and capable of being :swung in the plane of the jaws about its pivot towards said guide surfaces to Lhold'thewor'k thereagainst, an abrasive element carried by said body and arranged to bear unyieldingly against said surface of revolution, means tending to resiliently hold the other end of said jaws open and said support away from said guide surfaces, and screw means operable .to overcome. said resilient means to bring thejaws and support to, and positively hold them against outward movement from, any one of aninfinite number of relative positionsof adjustment.

2. Anexternal hone comprising in combination a body including two jaws pivoted together :ment :of the screw and nut mechanism .andthe I pawl-like .member. The upper and .lowerjaws 29, :are :hingedlyemounted on a pivotpin 3|, as

1 111 15119 previous construction, and the guide block :32 and-abrasive element 33 .are also similarly u positioned. A headed screw 34 mountedin tr11n. nionblocks 3-5,.36connects-thence ends-29a,'3fla :uftheupper :and lower-jaws in order to. permit "adjustment of the degree of opening and closing of the latter. A pawl-like member 31 is pivotally ":mounted between lugs 38 which protrude in Wardly Yf-rom the free end 29a of the upper jaw so that the pawl-like member projects into the aperture 39 between the jaws, the nose 31a of the pawl-like member being arranged to bear on .the :surface of the work on the opposite side of a diameter of the latter parallel to a chord drawn through the points of contact between the work and the guideportions 'of the bifurcated guide block 32 from such guide portions and being disposed so thatsuch guide portions are substantially symmetrical with respect thereto. Adjustment of the pawl-like member 31 is effected by ;a second headed screw 40 which passes through aclearance hole 4.! in the upper .jaw 29 and threads into a trunnion block :42 pivotally .mounted in the pawl-like member. To proside a bearing for the head of the screw 40 a'boss 43 deformed on the exterior surface of .the upper jaw. As in the previous construction springs .44 are provided to prevent the jaws 29, 30 and the pawl-like member 31 from collapsing inwardly. Figured .shows a further embodiment of the invention. In .this construction the upper and lower jaws A5, 46 are hingedl-y mounted .on a

pivot pin 41, which also- :forms the hinge oint for the pawl-like member .48. A bifurcatediguide block 49., symmetrically disposed ,in relation-to the nose 4.812. of the pawl-like member, which is arranged on the opposite side of the diameter of .the work, parallel to the guide block chord,

from the guide portions of the guide block, as

and arranged to provide an aperture -therebetween,;-said :body having guide surfaces adapted to bear at a plurality ofcircumferentiallyspaced points-against .a, surface of revolution of. work placed within the aperture, .an abrasiveelement carried by said body and adapted 'to bear, .un-

yieldingly against said surface or revolution at a point substantially diametrically opposite one of .sa'id'plurality of. points, means for drawing the jaws towards each other-and setting thempositively :against outward movement in the relative positions to which they have been adjusted to. effect adjustment of the abrasive element relatively to said surface of revolution, and a support movable with respect to the body to hold the work between said guide surfaces, the movement of said support being effected by the .same means as those by which the jaws are drawn to- "wards each other.

3. An external hone comprising in combination .a body including two jaws pivoted, together and arranged to provide an aperture therebetween, said body having guide surfaces adapted to bear ata plurality of .circumferentially.spaced points against a surface of revolution of work placed within the aperture, an abrasive element carried by said body and adapted to bear .unyield-ingly against said surface of revolution. at a point substantially diametrically opposite one of said plurality of points, screw and nut mechanism for drawing the jaws towards each other and setting them positively against outward movement in the relative positions to which they have been, adjusted to effect adjustment of the abrasive element relatively to said surface .of revolution, a compression coil spring disposed around said screw to maintain the jaws against collapse, and a support movable with respect to the body .to hold the work against said guide surfaces.

4,.An external .hone comprising in combination a body having an aperture therein, a bifurcated block carried by said body and projecting inwardly into said aperture so that guide vper-- 'tions of, said block bear at two circumferentially spaced points against a surface of revolution of work placed within the aperture, an abrasive element carried by said body and arranged to project into said aperture and bear against said surface of revolution at a point substantially diametrically opposite one of said guide portions, a pawl-like member pivotally mounted on said body and which projects into the aperture and is capable of being swung in the plane of the body about the pivot so that a nose portion of the pawl-like member is brought into contactwith said surface of revolution to hold the work against the two guide portions which are disposed substantially symmetrically with respect to said nose portion, and means carried by the body for adjusting said abrasive element relatively to said surface of revolution.

5. An external hone comprising in combination a body including two jaws pivoted together and arranged to provide an aperture therebetween, said body having guide surfaces adapted to hear at a plurality of circumferentially spaced points against a surface of revolution of work placed within the aperture, an abrasive element carried by said body and adapted to bear unyieldingly against said surface of revolution at a point substantially diametrically opposite one of said plurality of points, screw and nut mech anism for drawing the jaws towards each other and setting them positively against outward movement in the relative positions to which they have been adjusted, a pawl-like member pivoted 6 to one of said jaws and movable With respect to the body to hold the work between said guide surfaces, the nut of the screw and nut mechanism being pivotally carried by said pawl-like member and the arrangement being such that tightening of the screw first causes a nose portion of said pawl-like member to bear upon said surface of revolution and then draws the free end of the jaw carrying the pawl-like member towards the free end of the other jaw, with said pawl-like member acting as a lever and said nose portion as a fulcrum, until said abrasive element is brought to bear against said surface of revolution.

GEORGE FREDERICK WAGSTAFF.

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

UNITED STATES PATENTS Number Name Date 1,346,271 Smith July 13, 1920 1,370,141 McNicholas Mar. 1, 1921 1,376,274 Hays et a1. Apr. 26, 1921 1,411,181 Eetersen et a1 Mar. 28, 1922 2,162,187 Tharp June 13, 1939 2,176,404 Sandy Oct. 17, 192i

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