US1289924A - Knob-grinding machine. - Google Patents

Description

A. J. SANFORD.

KNOB GRINDING MACHINE.

APPLICATION FILED SEPT. 12, I914.

Patented Dec; 31, 1918.

3 SHEETS-SHEET l- Z. Z9 29 I 29 29 as 32 as I 26 32 32 39 38 2 39 39 WITNESSES,

W/ZFQM A. J. SANFORD.

KNOB GRINDING MACHINE.

APPLICATION mu) SEPT. 12. m4.

1,289,92Qu Patnted Dec. 31, 1918.

s SHEETS-SHEET 2. DU

WITNESSEQ Tie/mu WKWZZ A. J. SANFORD. KNOB GRINDING MACHINE.

APPLICATION FILED SEPT. 12, m4.

1 ,%89,92%, Patented Dec. 31, 1918.

3 SHEETS-SHEET 3- llll llllll I I J WITESSE.

I UNE' %TE% AEN 'FFTQ.

NDREW J. SANFORD, or NEWARK, OHIO, ASSIGNOB, To A. H. HEISEY & 00., or

" NEWARK, OHIO.

KNOB-GRINDING MACHINE.

Specification of Letters Patent. Patemtmd Dec. 31, 19118.

Application filed September 12, 1914. Serial No. 861,418.

To all whom it may concern:

Be it known that 1, ANDREW J. SANFORD, a citizen of the United States, and resident of Newark, in the county of Licking and State of Ohio, have invented a new and useful Improvement in Knob-Grinding Machines; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to knob grinding machine or to a machine for grinding and finishinga spherical face on the top of a knobfusually the knob of a bottle or jar, but it is equally adapted for finishing the ends of door knobs and the like made of glass. The invention also contemplates forming not only a convex spherical. face on objects of this character, but also forming a concave spherical face on glass articles where such form of face is desired. A further object of the invention is to provide means for operating upon a plurality of objects simultaneously. A. further object is to provide such means that by the operation thereof spherical faces of great accuracy and uniformity may be formed on the several obje ts.

With these and other objects in view as will appear from the following description,, the invention consists in the construction and arrangement of "parts, a preferred embodiment of which is illustrated in the accompanying drawing, in which Figure 1 is a front elevation of so much of the machine as is necessary to illustrate the arrangement of the parts; Fig. 2 is a section on the line f 22, Fig. 1, looking in the direction of the arrow; Fig. 3 is a vertical sectional view of one of the knobgrinding chu ks and the operating parts therefor; Fig. 4 is a horizontal se tional view on the line 4- 4, Fig. 2; and Fig. 5 is a view partly in section "of a modified form of the invention for grinding a concave spherical surface.

In the embodiment'of the invention illustrated in Figs. 1 to 4 inclusive, 11 indicate the lateral standards of the machine, in the lower part of which is journaled shaft 2 driven by a\belt 3 on the fast and loose 'pullevs 4 and 5 respectively. On this shaft are fixed the grinding wheels 6, here shown four in number. The fa e of each wheel as shown in Fig. 1 is concave as at 7, in

' order to grind a convex spherical face on the article to be finished. Above each wheel regulate a gear 28,

is mounted a chuck head 7, each of. which is provided with a cylindrical boss or so'ket 8 Within which the outer end of a rocking sleeve or shaft 9 is fixed by a set screw 10. This hollow rock shaft or sleeve 9 is journaled in bearings 1l 11 formed on an ad justable framework 12. This framework 12 is adjustable vertically in a bracket 13 secured to a cross bar 14 at the front of the main frame of the machine (see Fig. 2). As shown in Fig. 4, the frame 12 has beveled side edges 15held in dovetailed guideways 16-16, the latter of which is detachable as by bolt 17 to facilitate the mounting of the frame in the' guide-ways. The adjusting screw 18 threaded through a lug 19 of the stationary bracket 13 and the upper edge of the screw 18 is provided with a hand wheel 20 by which the adjustable frame may be adjusted up and down to the position of the chuck-head 7 with respect to the grinding wheel 6, so that articles of different size may be ground to the proper curvature.

In order that a spherical surface may be ground on the knob or other article by means of the grinding wheel 6, it is necessary that the chuck-head be rocked from side to side with respect to the grinding wheel, and at the same time that the knob or other article he revolved in a plane at right anglesto its axis. With these ends in view, the chuckvhead' shaft 9 has atta hed thereto a ro king arm 21, the outer end of whi h is conne"ted by a rod 22 and an eccentricstrap 23 with an e-centric 24 fixed to a shaft 25 journaled in a bearing sleeve 26 at the upper-end of the adjustable frame or bra ket 12. The rearend of the shaft 25 is provided with a gear 27'meshed in with slidably fixed on a vertical shaft 29. This shaft" 29 is also provided with a beveled driving gear 30. whi h is splmed to the shaft and is slidably mounted thereon, and is held in mesh with a gear 31 on the shaft 32 by means carried by the frame arm 34. The shaft 32 is journaled in bearings 35 on the frame arm 34 and has at its forward end a worm gear 36 driven by a Worm 37 fixed to a transverse shaft 38 journaled in bearings 39 at the top of the machine frame. The shaft 38 is driven by a pullev 40 connected by belt 41 with a pulley 42 fixed to the main guide of a supporting sleeve 33 shaft 2. Thus it will be seen that as the ma hine operates, the entire chuck-head 7 will be rocked transversely of the adiacent grinding wheel 6. In order to produce a true spherical surface on the article ground, it is necessary to provide the gear 28 with one or twomore teeth than the gear 27 in order to vary the rocking movement of the chuckhead slightly with reference to the rotary movement of the chuck as hereafter described; otherwise, the cut would be somewhat conical. In order to give the required rotary movement to the chuck and referring particularly to Fig. 3, it will be found that the chuck-head 7 is provided with a bearing sleeve 43, having an integral ballrace 44 at its lower end and an adjustable ball race 45 threaded to its upper end, said adjustable ball race is fixed in position on the outer end of the shaft 53 is provided with a beveled gear wheel 54, which in turn meshes with a beveled gear 55 fixed upon the vertical shaft 29. It will be seen, therefore,

that as the machine operates, the chuck sleeve 51 will be constantly rotating.

In order to hold the work firmly within the chuck-head, a chuck 56 is provided, on

. the outer periphery of which are formed locking ribs 57 whiz h as shown in Fig. 4, engage between corresponding locking ribs 58 formed on the inner wallsof the chucksleeve 43. The chuck 56 is provided at its lower end with a socket or work-receiving recess 59, within whi'h is mounted a plurality of clampingarms 60, the inner ends of which are recessed at 61 to engage the adjusting disk 62 fixed to the lower end of a spring held rod 63. Upon the upper end of the rod '63 is fixed a sleeve64 forming an abutment for a (oiled spring 65, the opposite end of which rests upon an angular shoulder 66 in the bore 67 of the chuck 56. The spring tends normally to withdraw the rod 63 within the bore 67 of the chuck. Surrounding the lower end'or opening of the work-receivmg and clamping recess 59 of the chuck 56, may be mounted a stop ring 68, which may be composed of rubber or other comparat1vely soft material. It Will be seen from an lnspectlou of Fig. 3, that tile bore or diameter of the work-re'eiving recess 60 of the chuck 56 is so small that when the clamping fingers 60 are drawn within this recess they tend to collapse. The work, which in Fig. 3 is represented as a glass knob 69, is provided with a flange or head 70 which may be en gaged by the hook shaped outer'ends 71 of the clamping fingers 60, so that under thepull of the spring 65 of the chuck, the clamping fingers 60 together with the workheld thereby will be' drawn within the work-re.

firmly to permit the work to undergo its rocking and turning movements during the grinding operation. For, pieces of work of considerably greater or less diameter than that here shown, it is merely necessary to substitute in the chuck-head a chuck having a recess of'greater or less diameter as the case may be. Small variations of'the diam,- eter of the work, however, may be taken care of in the same chuck.

Should it" be ne"essary to'rough'grind the work before the finishing operation, abrading sand or other material may be supplied to the grinding face of the grinding wheel 6 by means of a pipe 72, Fig. 3, leading from a suitable source of such material. e

When the machine is used for grinding convex spherical faces upon the work, it will be noticed that the center of oscillation or rocking of the work must be above the surface being finished, or above the grinding face of the grinding wheel. When-it is desired to grind a concave spherical face on the work, it is necessary that the center of oscillation be below or outside the portionof the work being operated upon, and below or within the circumference of the grinding wheel. Also in grinding 'a concave surface,

the grinding face of the grinding wheel must be convex transversely instead of concave as heretofore described.

An apparatus embodying means for con.-

cave grinding is indicated in Fig. 5 in the drawing. The parts of this apparatus are in many respects the same as those heretofore des ribed except that the ro"king sleeve 73 instead of lying above the ircumference of the grinding wheel, lies within or below said circumference. The grinding wheel 74 in this case has a convex circumference instead of a concave circumference as heretofore described. This together with the fact that the rocking sleeve 73 is below 01 extends along a line within the circumference of the grinding wheel, produ"es a concave surface in the article ground instead of a convex surface as heretofore described. The mechanism of Fig. 5 is, of'course, provided with the same rocking mechanism-such as the lever 21 and rod 22as that illustrated 'in conne tion with Figs. 1 and 3. It may also be desirable to vary the size or diameter of the concave cutting; that is to say, make the concavity aeaeaa deep or shallow as the case may be. To this end the sleeve 7 3 is pinned or secured at 74 to a boxlike bracket 75, having a journal bearing in the bottom thereof for a shaft 7 7. A gear 7 8 fixed on the inner end of the shaft 53 meshes with a gear 7 9 fixed to the shaft 77. Adjustably mounted on suitable guideways 80 and 81 of the lower bracket 7 5 is an upper boxlike bracket member 82 within a bearing 83 of which is journaled a sleeve 8& of the chuck-head 85. In order to rotate the chuck in the chuck-head, a shaft 86 corresponding to shaft 53, Fig. 3, is journaled in the chuck-head sleeve 84. The end of the shaft 86, which projects into upper adjustable bearing bracket 82, has fixed thereto a gear 87 which meshes with a gear 88 splined on the upper end of the shaft 77. The gear 88 is free to slide on said shaft 77, and the upper bracket member has fixed thereto an arm 89 which slidably engages the shaft 77 and supports the gear 88 in adjustable position thereon. It will be seen, therefore, that the upper bearing bracket 82 may be adjusted up and down with reference to the axis of the rocking sleeve 73 so that the radius of the arc movement of the chuck-head 85 may be varied. This obviously in conjunction with the curvature of the circumference of the grinding wheel 74, will vary the diameter of the concavity of the face of the article to be ground.

While I have herein described various preferred embodiments of my invention, it is to be understood that the invention is not limited to the construction and arrangementof parts herein described, but may be varied in detail within the scope of the appended claims.

What I claim is:

1. In a grinding machine, the combina tion with a grinding wheel having a trans versely curved grinding face, and means for driving said wheel, of a work holder having actuating connections for rocking the work transversely of said wheel and for simultaneouslyrevolving the work onits own axis to grind a spherical surface on the work, and means for adjusting said work holder toward and from said grinding wheel.

2. In a grinding machine, the combination with a grinding wheel, having a transversely curved grinding face and means for drivin g said wheel, of a work holder, comprising a chuck-head, a rock shaft fixed to said head, actuating connections for said rock shaft, a revoluble chuck mounted within said head, an actuating shaft mounted within said rock shaft and adapted to revolve said chuck, an

operating connection for rocking and rervolving the work in synchronism to form aspher cal face on the work.

In a grinding machine, the combination with a. plurality of grinding wheels, each having a transversely curved inding face,

- volving means respectively,

and means for operating said wheel, a work holder for each wheel, and operative connections for rocking said work holder and revolving the work on its axis, all of said operating connections beingconstructed and arranged to operate in synchronism to'form spherical faces on each piece of work simultaneously and uniformly, and means for ad justing ofwsaid work holders independently with respect to its grinding wheel to accommodate pieces of work of different size and to vary the diameter of curvature of the ground face.

4. A work comprising a chuck-head, having a rock shaft fixed thereto, a chuck sleeve rotatably mounted within said head, said sleeve having a gear attached thereto, a shaft mounted Within said rock shaft, a gear carried by said second shaft and meshin with said sleeve gear, a work holding chuc removably mounted within said sleeve and having interlocking meanswith said sleeve to cause said chuck to revolve with said sleeve, said chuck having spring actuated arms to grip the work and hold the same against rotating with respect to said chuck.-

5. In a grinding machine, the combination with a grinding-wheel having, a curved grinding surface and means for driving said holderfor a grinding machine wheel, of a work-holder having means for rocking the work transversely of the grinding surface of the wheel, and means for simultaneously revolving the work on its own axis while in engagement with the wheel in order to grind a substantially spherical surface on the Work, said revolving means and said rocking means being so relatively arranged as to continually vary the presentation of the surface to be ground to the grinding-wheel.

6. In a grinding machine, the combination with a grinding-wheel having a curved grinding surface and means for driving said wheel, of a work-holder for rocking the work transversely of said means for simultaneously revolving the work on its own axis while in engagement with said surface, said rocking and revolving means being so constructed and arranged as to varv the presentation of the work to the grinding surface to produce. a spherical surface on the work.

7. In a grinding machine, the combination with agrinding-wheel having a curved grinding surface and means for driving said wheel, of a work-holder having means for rocking the work transversely of said grindin'g surface, and means for simultaneously revolving the work on its own axis, common means for operating the rocking and rethe connections of said common driving means with said rocking and revolving means respectively being so synchronized as to vary the presenta- 119 grinding surface, and

'tion of the Work to the grinding surface in a way to produce a spherical surface on the Work.

, 8. In a grinding machine, the combination with a grinding-Wheel having a' curvedgrinding surface and means for driving said "Wheel, of a Work-holder having means for necking the Work transversely of the grindlng surface, and means for simultaneously 3 revolving'the ork on its own axis While in engagement With-the grinding surface, the rocking axispf the work beingjooated cm a line extendmgbetween the grmding surface of the Wheel and the center of the Wheel.-

In testimony whereof, I the said. ANDREW 1 J. SANFORD, have hereunto set my hands ANDREW J; SANFORD. Witnesses: v

H. C. MUELLER, J. P. Goonwm. I

Images