US1212552A - Grinding-machine. - Google Patents

Description

R. D. PIKE.

GRINDING MACHINE.

APPLICATION FILED MAR. 20. I916.

L l fifi o Patented Jan. 16,1917.

3 SHEETSSHEET l- WITNESS 2f N ZVTOR.

R. D. PIKE.

GRINDING MACHINE.

APPLICATION, FILED MAR. 20, l9l6.

1 ,21 2,552 Patented Jan. 16, 1917.

3 SHEETS-SHEET 2.

WITNESS WE'QM BY y A ATTORNEYS.

R. D. PIKE.

GRINDING MACHINE.

APPLICATION FILED MAR. 20, 1916- 1,12,552, Patented Jan. 16, 1917.

3 SHEETS-SHEET 3.

WITNESS v view, enlarged,', of one of the chucks.

I ing the ends ofv rods, as, for example, electric ROBERT D. PIKE, OF SAN FRANCISCO, CALIFORNIA.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Jan... 116, 121W.

Application filed March 20, 1916. I Serial No. 85,375.

To all whom it may concern:

Be it known that I, ROBERT D. PIKE, a citizen of the United States, residing in the city and county of San Francisco and State of California,haveinvented certain new and useful Improvements in Grinding-Machines,

of which the following is a specification.

The present invention relates to. a grinding machine, and -more particularly to an apparatus for pointing or otherwise grindarc carbons and the like. The pointing of such carbons, and. particularly those used in projection apparatus, requires extreme care, in order to insure absolute equality in the finished product, since a point incorrectly centered, or of abnormal size, causes trouble-and waste in the use of the carbon.

Moreover, on account of the brittleness of I the carbons, great care must be exercised to support them properly at all times, and to relieve them from all shocks and jars which would cause breakage.

The object of the invention, therefore, is to provide a machine which automatically. grinds the ends of carbons to correctly formed points, and which, by its continuous action, performs. the desired work with thegreatest possible efliciency.

Although the machine is designed primarily for the pointing of carbons, and is so illustrated and described hereinafter, nevertheless it may also be employed for pointing or grinding other objects, and may be readily adapted to a great variety of uses without necessitating any changes in the essential features of the invention.

In order to comprehend the invention, reference should be had to the accompanying sheets of drawings, wherein- Figure 1 is an elevation of the machine. Fig. 2 is a plan viewof the same. Fig. 3 is a vertical section, enlarged, taken on the line 3-3 of Fig. 2 and viewed in the direction of the arrows. Fig. 4 is a part sectional Fig. 5 is amend elevation of the same. Fig. 6 is a detailed view of one of the chuck jaws and the operating sleeve therefor. Fig. 7 is an enlarged detail of, one of the supporting brackets for the chucks. Fig, 8 is a rear elevation of the same. Fig. 9 is a plan view of the same. Fig. 10 is an enlarged detail of the final carbon guiding means. Fig. 11 is a part section enlarged of the initial carbon guiding means. Fig. 12 is a plan view of. the same. In the drawings the reference numeral 1 Indicates a suitably constructed base, to which is-attached a vertically disposed column and a laterally projecting bracket '3,-F1gs. 1 and 3 of the drawings. The

bracket 3 provides a bearing for-concentric shafts 4 and 5 carrying respective driving means 6 and 7, shown in the drawings as pulleys. Upon the inner ends of said shafts 4 and 5 are mounted respectively bevel gears 8 and 9, which mesh with coacting bevel gears 10 and 11 fixed respectively upon the lower ends of concentric vertical sleeves 12 and 13, surrounding the central supporting column 2. Suitable thrust bearings 14 are providedat the lower ends of said vertical sleeves to support the weight thereof, and

suitable radial bearings 15 are provided at the upper ends of said sleeves.

The outer sleeve 13 carriesat its upper end a turret 16Figs. 1, 2 and 3 of the drawings, to which the carbon holding chucks are attached in the following manner: .Mounted for sliding movement in a direction radial with respect to said turret 16, in suitably formed guides 17, (Figs. 3, 7, 8 and 9 of the drawings), is a bracket 18 carrying on its outer end a bearing 19, shown as comprising two diametrically divided parts held together by screws 20. "Said bracket 18 has an upwardly projecting lug 21, bored and interiorly threaded to receive an adjusting screw 22, said screw passing through and having a bearing in a cross piece 23 bridging the guides. Thrust collars 24 and a lock nut 24" are provided on said adjusting screw 22, on either side of the bridge 23, to retain said screw-in its proper lineal posi 'tion. The outer end of the adjusting screw 22 is preferably formed to receive a wrench as shown at 25. The guides 17 are preferably mounted upon the turret 16 with the interposition of resilientcushions 17 of rubber or other similar material, to absorb the shocks due to the grinding action.

In the drawings, four carbon holding chucks are shown disposed about the periphery of the turret 16, althou h it is to be understood that any number c said chucks may be used within the limits of structural and operative practicability, each chuck being independently adjustable radially of the turret by the means described above. Each carbon holding chuck is rotatably mounted in the bearing 19 of the sliding bracket 18, said chuck being provided for this purpose with a reduced exterior diameter 26 (Fig. 4 of the drawings) bounded at each end by thrust'flanges, or bearings 27. Said chuck is inclosed within a shell 28 upon the upper end of which is carried abevel gear 29, said gear meshing with a large bevel gear 30, (Figs. 1 and 3 of the drawings), mounted upon the upper end of the vertical sleeve 12.

Thus it will be seen that by the slow rotation of the turret 16, driven by the pulley 7, the carbon holding chucks are carried around in a continuous circular path, and by the more rapid rotation of the gear 30, driven by the pulley 6, the carbon holdingchucks are individually rotated at a high rate of speed within their respective journals 19.

The mechanism of the carbon holding chucks, all Of'RWlllCll are identical, may be described as follows, with reference to Figs. 4 and 5 of the drawings. The shell 28 car- 'ries at its outer or lower end a ring in which are forined substantially longitudinal inclined guide-ways 32, each of said ways being adapted to receive and support a sliding jaw 33, the inner surface thereof being parallel with the axis of the chuck and formed with teeth 34 for gripping the'car 'bon, or other stock to be operated on, as

shown in Fig. 5 of the drawings. Three of.

said jaws 33 are illustrated in the preferred form of the-chuck, although more may be. used, if desired. Within theshell 28 of the chuck is a slidably mounted sleeve 35-'Fig.

in the flange 36 of said sleeve, and having sliding movement therein radially with respect to the chuck. Thus it will readily be seen that an inward lineal movement of the sleeve 35, as caused by the spring 38, moves the jaws 33 within their inclined guides 32, which movement results in moving said jaws inwardly toward the center of the chuck;

and opposite movement of the sleeve 35 causes an outward movement or expanding said jaws. By reversing the inclination the guides 32 and the action of the spring the jaws may be made to close upon an outward movement of the sleeve 35, if such movement be more desirable than that described above.

The outer ends of the sleeves 35 of th carbon holding chucks carry cam followers 43 rotatably mounted in suitable bearings 44 and adapted to follow a face cam 45 carried at the periphery of a fixed table 46 mounted upon the upper end of the vertical supporting column 2. Said cam 45 causes the chucks to be opened andclosed by rais ing and lowering the cam followers 43, as said chucks are carried around by the rotation of the turret 16.

Projecting from the base 1 on one side thereof is a bracket 47 (Figs. 1 and 2 of the drawings) which carries an arcuate guide platet48. Said guide plate 48, as shown in Figs. 11 and 12 of the drawings, is adjustably mounted upon the bracket 47 and secured thereto as by means ofbolts 49, and is inclined, as shown, to a position perpendicular to the axis of the carbon 53 within the chuck, and its upper-surface is serrated as shown at 50, the teeth thereof being pointed in a direction opposite to that of the rotation of the turret 16. A slot 51 is provided in the upper face of saidgu'ide 48, and discharge apertures 52 extend from the bottom of said slot through said guide for a purpose hereinafter set forth.

In the operation of the apparatus, when the cam follower 43 of a chuck rides upon the raised portion 45 of the cam 45 at the position A in Fig. 2 of the drawings, the jaws of that chuck are then opened. W hen said chuck, by the rotation of the turret 16, is carried over the end of the guide 48, a carbon is dropped into the upper end of the chuck by theoperator, or in any convenient manner, not shown in the drawings. The carbon falls through the chuck until its end rests upon the guide 48as shown in Fig. 11 of the drawings, whereupon any soft material adhering to the end of the carbon 58 is'renioved therefrom by the teeth of said guide, and falls through the apertures 52. The cam follower 43 runs ofi the end of the raised portion 45 of the care before the carbon reaches the end of the guide 48, and said carbon is thereby firmly clamped in the chuck in the desired lineal position for grinding. At the position B-Figs 2 and 3 of the drawings,.the lower protruding end of the carbon 53 is carried across the face of a preferably dished grinding wheel 54, said wheel being set obliquely with respect to saidcarbon, so that as said carbon is can ied across the face of said wheel, and rotated upon its axis as described above, a point of the proper form is formed upon said carbon. The grinding wheel 54 is preferably driven from a motor 55 in any convenient manner, as, for example, by a belt 56, and is mounted in such. a manner as to provide for adjustment thereof relative to the carbon 53 at said position B. F or purposes of illustration l have shown this mounting ofthe grinding mechanism as comprising a fixed stand 57Fig's. l and 2 of the drawings, upon which is carried for vertical and horizontal adjustment a bracket 58 and upon this bracket in turn are mounted the grinding wheel. at and the driving motor 55. Suitable means are provided, as indicated at 59, for adjusting said bracket in a vertical arcuate path to movethe grinding wheel toward or away from the carbon 53. A similar grinding mechanism is preferably provided at the position C-Fig. 2 of the drawings, having a grinding wheel 54: and a zdriving motor mounted upon a stand 5 54 and 54,- relative to the carbon 53 are such that the point is roughly formed by the wheel 5% at the position B and finished by the wheel 5% at the position C. Immediately after the carbon-53 is carried free of the grinding wheel 54, the cam follower 43 rides upon a short raised portion 45" of the cam to, thereby momentarily opening the chuck and allowing the carbon 53 to fall until its end rests upon a final guide plate 60, adjustably carried by a bracket 62, Fi 2 of the drawings, extending laterally and upwardly from the base 1. This guide plate is illustrated in Fig. 10 of the drawings as arcuate in form, disposed perpendicularly to the carbon 53 and provided with a tapered arcuate slot 61 into which the point of the carbon 58 The carbon is thus limited in its downward movement within the re leased chuck bythe diameter of its point. The chuck is thereupon closed to again grip the carbon, the continued rotation of the turret 16 carncs the pointed lower end of said carbon over the face of an end grinding wheel 63, said wheel being preferably driven by a motor 6 l-l ig.. l of the drawings, mounted suitably termed bracket 65 extending rom supp rted vby the bracket grinding wheel 63 grinds the end the pointed carbon to the proper si ereby insuring the proper length of" The chuck is thence carried to the posi"'on fir-Fig, 2 of the drawings, where the carbon is released and allowed into a discharge chute 66- ig. l of c drawings, from whence it is e reloaded.'

The o 'on of the machine is continuousat a flies, carbons are fed into the chucks successively and are successively carried past guiding plate t8, the two poi wheels 5% and .5 2, the final guiding i th finishing wheel 63 by the 1e turret 16, Moreover, the i. I nuously is ready The positions of the grinding wheels convenient means, and the chuck then assumes its original position, and

rotated at relatively high speed by the gear 30. The machine therefore operates with the greatest possible efiiciency.

l have hereinbefore described and illustrated my invention in its preferred form. I do not Wish, however, to be construed as limiting myself to said preferred form, for the reason that many changes may be made in the device without in anyway afiecting the principles of the invention, and 11 there; fore wish to be understood as claiming the invention as broadly as the state of the art will permit.

Having thus described my invention, what it claim as new and desire to protect by Letters Patent is 1 1., In an apparatus for the described purpose, the combination with a plurality of grinding means, of a device for holding the work to be ground, mechanism for moving said holding device tocarry the work successively into and out of the spheres of action ofthe grinding means, means for correctly positioning said work within said holding device prior to the first grinding operation, and means for ire-positioning said work within said holding device after said first grinding operation.

2. in an apparatus for the described purpose, the combination with a plurality of grinding means, of a device for holding the work to be ground, mechanism for moving said holding device to carry the work :suc cessively into and out of the spheres of action of the grinding means, means for correctly positioning said work within saidholding device prior to the first grinding operation, and means for actuating said holding device to cause the samerto release said work after said first grinding operation, to enable said work to be repositioned within said holding device.

3. In an apparatus for described purpose, the combination with adjustable grinding means, of a device for holding the work to be ground, means for rotating said holding device upon its axis, mechanism for moving said holding device to carry the workinto and out of the sphere of action of.

the grinding means, and means for universally adjusting said means relative to said worlr, I

1-. ln an apparatus for-the described. purpose, the combination a plurality of grinding means, of a device for holding the work to be ground, mecuanism for carrying said holding device into and out of the sphere of action of t e grinding means, means for adjusting said" holding device on said carrying mechanism, and adjustable devices for correctly positioning the work within said holding device,

In an apparatus fo the described the combination *r' T a piural of a deuce tor holdthe pose,

turret to carry the work intooperative relation with said grinding means.

7 In an apparatus for the described purpose, a rotatable turret, a bracket carried in the peripheral region thereof, a resilient cushion interposed between said bracket and said turret, a device rotatably carried Withinsaid bracket for holding the work to be ground, means for rotating said holding de vice within said bracket, grinding means positioned in proximity to said turret, and

mechanism for rotating said turret to carry' the work into operative relation with the grinding means.

8. In an apparatus'for the described purpose, a rotatable turret, a chuck rotatably mounted thereon for holding the work to be ground, grinding means positioned in proximity to said turret, a guide plate associated with said turret for positioning the work within said chuck, and mechanism for rotating said turret to carry the work into operative relation with the grinding means.

9. In an apparatus for the described purpose, a rotatable turret, a rotatable chuck carried thereby for holding the work to be ground, grinding means positioned in proximity to said turret,an adjustable guide plate for positioning the work within said chuck, and mechanism for rotating said turret to carry the'work into operative relation with the grinding means.

10. In an apparatus for the described purpose, a rotatable turret, devices carried thereby for holding the Work to be ground, a grinding wheel positioned in proximity to said turret, said grinding wheel having a concave grinding face and being positioned with one edge of said face closer to said turret than the other, means for operating said grinding wheel, and mechanism for rotating said turret to carry the work across the operative face ofsaid grinding wheel.

11. In an apparatus for'the described purose a rotatable turret devices carried thereby for'holding the work to be ground,

a grinding wheel positioned in proximity to said turret, said rinding wheel having a concave grinding ace and being adjustably mounted with respect to said turret, means ing the'work in operative relation to said wheels, a guide for positioning said work within sald chuck, and mechanism for moving said chuck 'to carry the work into operative relation successively with said grinding wheels.

14'. A pointing machine comprising a grinding wheel, a chuck for holding'the work in inclined relation thereto, a guide for positioning said work within said chuck, comprising an arcuate plate having a serrated upper surface, and mechanism for moving said chuck to carry the work across the surface of said guide plate and into operative relation with said grinding wheel.

15. A, pointing machine comprising 'a' chuck for holding the work to be pointed, grinding means for pointing said work, means for transversely grinding the end of the pointed work, and mechanism for moving said chuck to carry the work into operative relation successively with said point grinding means and said end grinding means.

16. A pointing machine comprising a chuck for holding the Work to be-pointed, a guide for positioning the work within said chuck, grinding means for pointing the work he d by said chuck, a second. guide for re-positioning the work within said chuck, means for transversely grinding the end ;of the pointed work, and mechanism for moving said chuck to carr said work successively from said first guiding means through the sphere of action of said point grinding means, said second guiding means and said end grinding means. Y 17.- A pointing machine comprising a rotatable turret, a chuck carried thereby for holding the work to be pointed, a guide plate for positioning the work within said chuck, a grinding wheel positioned in proximity to said turret for pointing the work within said chuck, a second guide platefor re-positioning the work within said chuck, said plate having an arcuate tapered slot for receiving the point of the work, a second grinding wheel for finishing the end of the pointed work, and mechanism for'rotating said turret to carry the work successively from said first guide plate across the operative face of first grinding wheel, over said second guide plate, and across the operative face of said endfinishing wheel.

,in said chuck, a grinding wheel having a concave operative face positioned in proximity to said turret, a second guide plate, a second grinding wheel for transversely finishing the end of the pointed work, means for operating said grinding wheels, means forcontinuously rotating said chuck, mechanism for continuously rotating said turret to carry the Work from the first mentioned guide plate across the operative face of said first grinding wheel, over said second guide plate, and across the operative face of said second grinding wheel, and means actuated by the rotation of said turret to open said chuck to release the work held therein when said work is carried over said guide plates, and to close said chuck upon said work when carried into operative relation with said grinding wheels.

19. A pointing machine comprising a rotatable turret, a plurality of independently rotatable chucks carried thereby for holdin the work to be pointed, a grlnding whee positioned in proximity to said turret for initially grinding a point upon said work, a

second grinding wheel positioned in proximity to said turret for completing the point upon said work, a third grinding wheel for transversely flushing the end of the pointed work means for rotating said chucks, and mechanism "for rotating said turret to carry the work into operative relation successively with said grinding wheels.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ROBERT D. PIKE.

Witnesses:

HARRY A. To'I'rEN, D.'B. R104 m

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