US 2636322 A
Description (OCR text may contain errors)
INV NTORS ANGUS J. MO E ATTORNEY VERN H. BATHRICK JOHN A. CARLSON A ril 28, 1953 J A CARLSON ETAL GRINDING 0F iRREGULAR SHAPED WORK Filed March 15, 1951 E-Sheefs-Sheet l Filed March 15) 1951 Q a 10 /z luM-l 4 Q l r I INVENTORS ANGUS J MORSE VERN H. BATHRICK JOHN A. CARLSON April 1953 .1. A. CARLSON arm. 2,636,322
GRINDING 0F IRREGULAR SHAPED WORK Filed March 15, 1951 3 Sheets-Shqet 3 Patented Apr. 28, 1953 GRINDING F IRREGULAR SHAPED WORK John A. Carlson, Vern H. Bathrick, and Angus J. Morse, Muskegon, Mich., assignors to Sealed Power Corporation, Muskegon, Mich., a corporation of Michigan Application March 15, 1951, Serial No. 215,806
6 Claims. (01. 51-112) The present invention relates to grinding machines, and particularly to a novel, practical and very useful and effective attachment, designed and adapted to be connected with metal grinders of the opposed abrasive wheel type, the grinding wheels of which are spaced a short distance from each other at adjacent faces and between which faces various types of work pieces, such as piston rings or washers, or other relatively thin .articles of circular form are passed for simultaneous grinding at opposite sides. With our invention, irregularly shaped work pieces, which do not roll or rotate like substantially circular washers or piston rings, and which obstruct each other and in such grinders of the opposed abrasive wheel type, have not been fed through the grinder in a continuous grinding operation one after the other, before our invention, so'far as known.
With our invention, irregularly shaped work pieces may be continuously fed through conventional grinders of the opposed, spaced, abrasive wheel type. The primary object and purpose of our invention is to provide an attachment for such type of grinders which may be readily secured or installed in place on such type grinding machines, and which has novel structure for holding and guiding the irregularly shaped work pieces through and between the opposed grinding wheels without obstruction, jamming or the like. Such holders for the irregularly shaped work pieces will have a thickness slightly under the thickness of the worked pieces processed, so as not to be ground at either side by the grinding wheels, while the work pieces will have a thickness such that at opposite sides both of such sides will be equally ground and finished simultaneously.
Many novel structures and arrangements and combination of parts and elements for attaining the primary objectstated, as well as for attaining other objects and purposes not at this timeenumerated, will appear and be evident up'on an understanding of a preferred structure embodying the invention, described in the following description in connection with the aclustrating the station of entering or feeding the work pieces which are to be processed.
Fig. 3 is a fragmentary vertical section, substantially on the plane of line 33 of Fig. 2.
Fig. 4 is a further enlarged fragmentary vertical section, substantially on the plane of the line 4-4 of Fig. 2.
Fig. 5 is a fragmentary enlarged horizontal section, substantially on the plane of line 5-5 of Fig. 1.
Fig. 6 is a similar section, substantially on the plane of line 6-6 of Fig. l and Fig. 7 is a transverse,.enlarged, generally vertical section, substantially on the plane of line 1--1 of Fig. 1.
Like reference charactersv refer to like parts in the different figures of the drawings, andall sections are taken looking in the directions indicated by the arrows associated with the section lines.
The grinding machine to which our invention is applied includes two grinding wheels I mounted to turn preferably upon a common horizontal axis of rotation with adjacent vertical faces of the wheels spaced a short distance from each other as indicated in Figs. 5 and 6. The shafts and journals for carrying such wheels are supported on vertical supports 2 connected with the supporting frame 3 of the grinding ma.- chine which has an upper horizontal table extending to both sides of the grinding wheels. On what may be called the front of the table, a vertical plate 4 is permanently secured and at the rear portion, beyond the grinding wheels, a second plate 5 vertically positioned is likewise secured. The outer faces of said plates 4 and 5 preferably are substantially in the vertical plane of one of the grinding wheels I, the one at the back which is shown in Fig. l, the cooperating grinding wheel in front of such back wheel in Fig. 1 not being shown.
At the outer ends of the supporting plates 4 and 5, suitable brackets 6 of the structure shown in Figs. land 2, or their equivalents, are mounted and have a limited capacity for both vertical and horizontal adjustment by the usual set screw and slot conventional adjusting structure. A guide track for the holders of irregularly shaped pieces, which are to be ground at opposed sides, is secured at one end to the rear supporting bracket 6 attached to the plate 5, and extends therefrom upwardly in curved form and thence forwardly over the grinding machine and is thence curved to extend vertically downward, at its opposite end terminating in a curved portion attached to the front bracket ii. This guide track includes a back plate I which, in practice, will be made in sections secured together and to end, at the inner and outer edges of which and at what may be denoted as its front side,
spacer bars 8 are located, at the front side of which are narrow plates 9 extending inwardly toward each other, from the edges of the back plates 1, terminating at their adjacent edges short of each other. The guide track is reinforced and strengthened by bars iii of conventional, right angle across section, the plate I, the spacer bars 8, the narrower plates 9 and the bars It being bolted together to make a stable unit, as shown in Fig. '7.
Between the adjacent edges of the two narrow plates 9 a bar H which, though of several sections is in efiect continuous, is located, and is carried at spaced distances in the length thereof by flexible thin metal strips l2, permanently secured at their outer ends by the same bolts which bind the outer angle bar I, plate Sand associated spacer bar 8 together. Screws i3 attached to the outer of the plates 9, pass one through an opening between the ends-of each of the members i2, have thumb nuts thereon hearing against the adjacent members 52, with a light strength coiled compression spring I 1 around each screw between the outer plate 9- and the associated member i 2. which is substantially square in cross section tends to move away from the back plate 1 and isheld in proper adjusted position by operation of the thumb nuts on the screws 3.
Such guide track is adapted to hold circular carriers l5, which are rings, the exterior diameter of which .is less than the distance between the inner edges of the spacing bars 8, and greater than the distance between the adjacent edges of the plates 9. The thickness of the carrier rings i5 is less than the thicknessof the spacers 8. Therefore, such carrier rings l'5 may move from the entrance end of the guide track therefor, at the right in Fig. 1, through the guide and return to the outlet end of said guide track for delivery in succession to a horizontally located article feeding and article ejecting mechanism for such carrier rings. The irregularly shaped articles are fed one to each carrier ring I5 and carried thereby to pass between the adjacent faces of the grinding wheels After passing the grinding wheels such processed articles, preferably immediately before rings 15 enter the guide track structure, are ejected.
Between the vertical supporting plates 4 and -5, two parallel thin bars l6 extend from adjacent the outer end of one support 4 to the outer end of the other support '5, passing across and between the spaced opposed abrasive grinding Such bars are thinner than the space between the grinding wheels (Fig. 5), and are connected to their supporting plates 4 and 5 at opposite ends with a set screw ands'lot connection, permitting vertical adjustment or spacing of the bars Hi from each other. At the front of the wheels and on the .face of thesupporting plate 4 to which bars I6 are secured, a covering plate i! (see Figs. 1 and 2) is secured by set screws or the like passing through horizontal slots ITa in said plate and threading into the vertical support 4. As shown in Fig. 3, s owing bars I8 are between the support t and the plate IT. The bars l8 are of greater thickness than the bars l6, and also have greater thickness than the carrying rings ii. In the plate ll, agenerally centrally disposed opening is made into which a collar I9 is inserted and secured, having a central opening through it. A downwardly and inwardly or rearwardly inclined chutegfl. is connected to the collar [9. It extends up- Normally, the bar wardly and outwardly therefrom, down which the flat irregularly shaped articles 2| which are to be ground move by gravity, whereby the lowermost of such articles 2| drops into a carrier ring if: as such ring passes by the inner end of the opening through the collar (Fig. 3). The collar l3, flanged at its outer end, is releasably held in place by spaced radially disposed securing clips 22 (Fig. 2) through which set screws .pass threading into the plate 11.
Both above and below collar 19 are short horizonta1 bars 23 on the outer or front face of the plate secured to the plate by set screws passing through horizontal slots therein. Each bar at each end has a downwardly extending lug terminating in a forwardly extending horizontal boss 23a. Each boss has an axial opening, circular in cross section, through it from its outer to its inner end. A rod 24 (Fig. 4) passes through the boss, at its inner end being equipped with a head 25 inwardly of a collar 26 on the rod 24, against which a light compression spring .21, around the .rod 25, bears at one end, the opposite end of the spring coming against the inner end of an adjusting screw 28 lengthwise through which the rod 24 vfreely passes. The rod 24 at it outer end .is threaded to receive the nut. 24a, and the plate I? where the heads .25 are located is horizontally slotted as at 29 .(Fig. 2) ,so that the inner sides of said heads :25 may be adjusted to be spaced from the adjacent face of the support 4, a distance approximating the thickness of the article carrying rings i5. Thus the rings i5 at the time that the articles 2; are
received therein are maintained in position and do not tilt or shift at any time when the irregularly shaped articles 2| are fed thereto. Beyond the inner or rear edge of the plate H is a narrower cover plate 38 over the space between the bars l5 and at the outer sides thereof, holding the article carrying rings |5 substantially in a vertical plane until such rings, with the articles 2| therein'com'e to and enter the space between adjacent faces of the grinding wheels I,
The supporting plate 4 has a horizontal slot 3| therein (Figs. '3 and 5). At the back-of the plate, an endless chain 32, with spaced lugs 33, is mounted on wheels 34, one of'which is mounted for idle rotary movement, and the other on a vertical driven shaft 35, located adjacent the grinding wheels i, which shaft may be driven by the electric motor, belt and reduction gearing, indicated at as in Fig. l. The lugs 33 enter the openings in successive afiicle carrying rings |5,
engage thereagainst atone side and draw "the rings l5 with articles 2| therein, and push the other rings ahead of them, delivering such carrierrings and the articles 2| therein in continuous succession to and between the grinding wheels I. While engaged with the lugs 33, the carrier rings i5 do not rotate but are pulled along, but as soon as a ring I5, with the article 2| therein, is freed of the lugs and comes to the grinding wheels, such ring is free to turn and move by a rolling contact on the lower bar |6. The opposed sides of the articles 2| are simultaneously ground substantially equal amounts so that upon leaving the wheels 1,, the irregularly shaped articles 2| are entirely processed and are ready to be delivered from the machine.
A vertical plate 3] (Figs. 1 and 6) is mounted at the frontor outer side of the rear end portions of the bars I8 beyond the wheels |,being spaced supporting plate 4.
from the supporting plate"5 substantially the same distance that the plate I! is from the front It covers a part of the length of the lower bar 6 and extends upwardly a sufficient distance to retain the carrier rings l5 and the articles 2| therein until the entrance end of through a slot M in the plate 7 to bear against an article 2i to push it outwardly upon an inclined way 38 therefor for delivery of the processed articles 2! to a receiving receptacle 39 (Fig. l). The carrying rings l5 are'pushed alohg'their guide from the entrance end thereof, which is the delivery end for the processed articles 2|, moving the length of the guide track to return the rings to the delivery end thereof, which is the entrance end of said rings to the station where each carrier ring is supplied with an irregularly shaped article 2! to be carried to the grinding wheels.
The structure described is in practical use and has been thoroughly tested and proven. It satisfactorily accomplishes high quantity production and excellent quality in simultaneously grinding such irregularly shaped fiat articles at opposed sides. There is no obstruction jamming or the like, and no damage to either the grinding wheels or to the articles which might occur from such jamming obstruction of them. I
The invention is defined in the appended claims, and is to be considered comprehensive of all forms of structure coming within their scope.
1. In a grinding machine two spaced abrasive rotatable grinding wheels between which articles adapted to be ground on opposite sides are moved between the adjacent faces of the wheels, a substantially continuous series of abutting carrier rings of circular form, a loading station comprising a structure having a horizontal passage therethrough through which said carirer rings in succession are adapted to pass to and between the grinding wheels, including a horizontal supporting bar over which the carrier rings move between the grinding wheels from one side to the other side thereof, a structure at the other side of the grinding wheels having a horizontal passage therethrough through which said carrier rings pass after leaving the grinding wheels, said loading station structure having an entrance opening at one side through which flat articles to be ground by the grinding wheels are entered into said carrier rings in succession, and a track guide at the outlet end of the passage through the last mentioned structure extending therefrom upwardly and back and thence downwardly to the outer end of the horizontal passage through the loading station structure, and continuously operating means to engage with said carrier rings located at a side of said loading station structure for moving them therethrough and delivering them with the articles to be ground therein to between the grinding wheels, forcing said carrier rings through the grinding wheels and acting to force the rings through said track guide by pressure engagement of successive rings against each other to return them in succession to the entrance opening to the horizontal passage in said loading station structure.
2. In a grinding machine of the opposed abrasive wheel type, two grinding wheels with adjacent faces parallel to and spaced from each other,
vertically spaced-'horizontal'bars parallel to each other between said grinding wheels extending beyond the opposite edges thereof, and supports to which the ends of said bars are connected, a covering plate attached-to one of said supports at one side of the wheels and spaced from the support to provide a horizontal passage therethrough, a substantially continuous series of carrier rings,-successive rings bearing against each other and adapted to be entered into said passage at one side of the grinding wheels for movement thereof one succeeding the other to and between said grinding wheels, means for engaging with saidcarrier rings mounted at the outer side of said support continuously operating to force said carrier rings to the space between said grinding wheels, said plate secured tov the support having an opening at one side for the passage therethrough of irregularly shaped articles, one into each of said carrier rings, and a guide track receiving said carrier rings after they have passed between the grinding wheels carrying them upwardly and back over the grinding wheels to the outer end of said passage between said support and the plate attached thereto.
3. A structure as defined in claim 2, the thickness of the vertically spaced horizontal bars being less than the distance between the adjacent faces of the grinding wheels, said carrier rings having approximately the same thickness as said bars.
4. In a grinding machine of the opposed abrasive wheel type, two vertical grinding wheels with adjacent faces parallel to and spaced from each other, a horizontal bar between the grinding wheels extending to opposite sides thereof, a substantially continuous series of carrier rings, each adapted to receive an irregularly shaped article therewithin, said rings being in successive contact engagement and movable one after the other between the grinding wheels and resting upon said bar, means for guiding and carrying said rings over said bar to the grinding wheels, means for loading each ring with an irregularly shaped article at one side of and before reaching the grinding wheels, a track guide for said rings to which the rings are delivered at the opposite side of the grinding wheels, extending therefrom over and back to said carrying and guiding means for the rings, and means for continuously moving said rings one after the other in an endless path including over said horizontal bar and through said track guide.
5. In a grinding machine, two spaced opposed abrasive wheels, a guide track located to have an entrance opening at one end thereof adjacent one of the edges of the opposed abrasive wheels, carrier rings therein one after the other in continuous abutting contact engagement with each other, said guide track comprising a back, two spaced front members connected with said back parallel thereto and extending toward each other, and spaced from each other at adjacent inner edges, whereby the track guide is of a generally channel shape in cross section, said track guide being curved upwardly away from said entrance opening and thence extending downwardly and terminating in an outlet end in the same general plane with the entrance opening thereof, said outlet and entrance openings of the track guide being at opposed sides of the abrasive wheels, and said track guide being mounted in fixed relation thereto.
6. A structure as defined in claim 5, and a bar having a width less than the distance between the adjacent edges-of said front members of-the wrecks guide :lecated between themior the length of the track-guide, spaced flexible members connected to said bar :at one end of each of said members, .said members attheir other ends extending therefrom and being attached to the guide, and means for adjusting said flexible members to locate said bar in a predetermined spaced relation to the back d the trackrguide.
Number Name Date 844,816 Lee Feb. 19, 1907 1,142,700 Halstead June 3, 1915 Number a Number V Name Date Cofiman May 7, 1929 Rodemeyer June 17, 1930 Hughes June 14, 1932 McGirr -1 Aug. -8. 1933 Junker Mar. 17, 1936 Young July 30, 1940 Scott Jan. 7, 1941 Mason 'et a1. Oct. 13, 1942 Indge Jan. 19,1943 Inmen Oct, 1, 1946 Bullard Aug. 28, .1951 Young Oct. 16,1951
FOREIGN PATENTS Country Date Germany July '16, 1910