US1698365A - Apparatus for polishing plate glass - Google Patents

Description

Jan. 8, 1929.

HQ K. HITCHCOCK APPARATUS 'FOR POLISHING PLATE'GLASS Filed oct. 29, 192s 4 sheets-sheet 2 Jn. 8, 1929. H. K. HITCHCOCK ,APPARATUS FOR'POLISHING PLATE GLASS Filed Oc't. 29, 1925 4 Sheets-Sheet Jan. 8, 1929. C

y '1,698,365 H. K. HITCHCOCK APPARATUS FOR POLISHING PLATE GLASS 4 sheets-sheet 4 Filed octpze, 1925 Patented Jan. s, 1929.

UNITED. STATES 1 PATlazNTA OFFICE.

HALiann'r` K HITcHooox, or PITTSBURGH, PENNSYLVANIA, AssreNoa To PITTS- runen PLATE- GLASS COMPANY, A CORPORATION or PENNSYLVANIA.

APPARATUS FQR POLISHING PLATE GLASS.

. ipplcatioaled October 29, 1923. Serial No.` 671,374.

The invention relatesto an apparatus for polishing' plate glass. It is particularly .adapted for use in a straight away operation the lower end of the housing and is secured to in which the glass to besurfaced is passed continuously beneath a series of grinding and polishing machines, and the invention has its greatest value in this connection, but it is not limited to use in such connection. It has for its primary objects the provision of an improved apparatus, Wherein, (l) a uniform polishing eifect is "secured over the area of glass-passing beneaththe apparatus, vthe polishing mixture is distributed uniformly over the faces of the polishing felts, the

faces of the felts are automatically cleaned. at

intervals Which can be regulated to suit conditions, (4) the amount of polishing mixture to each felt can be independently regulated so as to be suitable for each character of work being done, (5)- the conduits for the polishing mixture are kept open and all danger of clogging avoided, and (6) anywaste of the polishing mixture is avoided and all splashing of the polishing mixture eliminated. Certain embodiments of the invention are illustrated in the accompanying drawings wherein:

Figure 1 is a vertical section through one form of apparatus. Fig. 2'is a plan View of the apparatus of Fig. 1. Fig. 3 is a section on the linelIIIII of Fig. 1. Fig. 4 is a vertical section through a modified form of the apparatus. Fig. 5 is a plan view of the apparatus of Fig. 4. And Fig. 6 is a diagrammatic side elevation View partially in section showing the method of circulating and mix- .ing the rouge and water.

Referring to the construction of Figs. 1, 2 and 3,1 is the spindle housing `in which is mounted the spindle 2'which projects from the runner frame by means of the key 4. The runner frame'is preferably a, steel casting of the skeleton form indicated in Fig. 2 and carries five runner blocks 5, although this number may be variedto suit requirements,.

it being preferred, however, to use runner blocks of relatively large diameter "as com- -pared with those ordinarily used'so that a less number are used than if smaller runner blocks were employed.

The runner blocks are of annular form, as

i' indicated in Fig. 1 and carry upon their lower sides the annular discs 6 of felt `or other yielding material suitable for use with' rouge or other polishing material, such felts being preferably secured to the runner blocks by means of water proof cement. The runner blocks are provided with hollow shafts 7 which are secured to such blocks by means of rubber diaphragms 8 clamped at their inner edges to the flanges of the shafts by means of the collars 9 held in place by screws or bolts and at their outer edges by means of the collars 10 held in place by the bolts 11. The shafts are journaled in the bearings 12, provided With suitable bushings, and disengagement of the Shafts from the bearings, when the runner. frame is raised, is prevented by means of the caps 13 which'are screwed down into the endsof the shafts as indicated at 14. The perforations 15 through the centers of the shafts provide conduits for the passage of a polishing mixture to the spaces at the centers of the blocks, and the diaphragms 8 prevent any splashing or lss of the polishing mixture. Y .Mounted upon the top of the runner frame is a casting 16 provided with the five annular troughs 17, 18, 19, 20 and 2l which communi- "cate with the passages 15 through the runner The compartments are supplied intermittent- I ly with the rouge mixture in the container 27 by means of the wheel 39 mounted for rotation and provided with the five buckets 40, 41, 42, 43 and 44mounted to swing freely on the rods 45 extending between the Sides of the wheel, these buckets being arranged in-different vertical'planes, so that each one supplies one of the compartments 34, 35, 36, 37 v1700' and 38. The swinging movement of the buckets in one direction is stopped by means of the stop members 46 on the `periphery of the Wheel, so that upont-he rotation of thewheel in the direction indicated by the arrow in Fig. l l, each bucket scoops up a quantity of the polishing mixture, and when it arrives at the position of the bucket 42 in Fig 1, the contents is dumped into a compartment in the box 33.

` Atop o the tank as indicated at 52.. A 'circu,

polishin The container 27 is supplied with a mixture of rouge and water or ot 1er polishing material through the' spigot 47, and a. water pipe 48 4is also provided -to-give an independent supply of water such pipe being controlled by means of theiva'lv'e 19a/'The linethod of supying the mixture to the pipe 47 is illustrated agrammatically in Fig. 6 in which 50 is a mixing tank or laxivator rovided with a circulation 'main 51 leading romv the bottom and havin itsOt-her end leading back into the lation of themixture is secured by .means of a pump 53. Proper proportions of rouge and water are supplied to the tank and the mixture is kept agitated j and thoroughly mixed by means of paddles 54 carried b the shaft 55, such shaft being driven by the shaft, or b any other suitable means. Leading from t e main `51 are the spigots 47v which go to the .various polishing machines. This method of circulation and mixing insures that the water and rouge will be thoroughly mixed and .that the mixture furnished to all ofthe machines through the spigots 47 will b et ve same. The main l is preferably i' made of wood as are also thes'pigots 47 in order to resist the actionof the rouge composition, which is acid in character, although cor` rosion resistin metal might Vbe used. The

main is prefera ly carried along over the various machines so thatthe spigots can discharge directl into the containers 27. There is thus little ginger of the mixture clog ing in its Passage from the main to the container, and i this occurs, the difficulty may quickly be removed by removing the spigot and insertin a -new one. The wheel 39. is driven from t e counter shaft 58 by means of the belt I59 (Fig. 3) the step pulleys 60 and 61 being employed so that the speedof rotation ofthe i the course of time.

wheel may be regulated to give any desired interval of feed. The amount of feed may be f varied by varying the level of the liquid in the container 27.

g As indicated in Fig. 2, the glass sheet 62 A which is bein polished is carried upon a table rangement as heretofore described,- a mixture of rouge and water of the proper character V1s supplled to each runner at separated inter' vals, in sutlicient quantity so that when a discharge of the mixture occurs to a runner block,` its surface 1s so softened that the rouge forms 'liquid used.

A lt 56 as'singY arounda pulley 57 on the upper en of the By means of the feed ar-4 a new face free from the defects before noted,

the old surface being sera edotl' more ori less as the runner passes over t 1e edges of the 'glass sheet depending somewhat on the amount of ranged that this surfacing etl'ect is secured The interval of feed is so ar` only when the blocks become ineffective so that the rouge is not scraped oli before it has had anopportunity to do the amount of polishing work which it should do. Then it is necessary to give the felts a more thorough cleaning than is afforded by this regular intermittent discharge of rouge and water, it may be, accomplished 'by increasing l the Volume of the mixturein the container 27 by adding water so' that it is very thin, 'or by using only water in the container for a short time or feeding water directly to the blocks from a hose. 4 t

The discharge 'of the rouge mixture to" the centers of the runners is advantageous, since there is no waste and the rou e is immediately spread between the felt am? the glass. The

annular felt thus acts somewhat as a brush distributing the rouge mixture over the surface of the lass so that the face on the felt is quickly re ormed and there is a minimum amount of waste incident to the 'mixturetlowing olf yof the side of the table. This feature and the supplying of the rouge beneath the diaphragmsS promotes economy in the use of polishing material and assists lnpreventing an accumulation of rou e over the surface of the runner frame ,and locks and Iprotecting the bearings and other parts from t e corroding action of the rouge mixture. neetion, the hollow shafts 7 are preferably made of some acid resisting composition so that In this conl they will last for a long period despite the corrodin action of the rouge mixture.

A furt er substantial advantage is` also in-` l l volved in arranging the rouge discharge streams so that their outlets follow the pads in thelr paths of movement in that' the mixture of Vrouge andwater gives a cooling effect iplon the glass Where it is of the greatest value. 1

e tendency ofthe annular series of pads or i blocks is to heat the glass in an annular ring which may cause breaka e due to unequal expaiision after the glass as passed beneath a number of runners; and the supply of rouge following along the annular paths tends to com ensate for this condition. A

T e method of feed, including the arrangement illustrated in Fig.` 6 is also of advantage since it ermits all of the machines of a series to e fed from the same container or .-tank 50. The -various machines of a series require a mixture containing a less and less proportion of rouge asthe polishing pro gresses, and this condition may be readi y secured in theapparatus as above described lby supplying a rouge mixture lof the' same v ,character to all of the containers 27 by means of the spigots '47 and then utilizing the water las pipes 48 to dilute the mixture to the proper consistency for the particular polishing stage for which thevmachine is bein used.

f If desired, the excess of water to givevthe fnecessary dilution may be applied to the stream of rouge mixture .anywhere along its travel to the table, or may be supplied to the table, itself, the result being the same invall cases. i

Figs. 4 and 5 illustrate a modification, such modification relating to the runner block construction and the method of supplying the rouge mixture from the annular troughs to the blocksthe other `parts of the apparatus being the-same as described'in connection with the apparatus of Figs. 1 to 3, and

being similarly numbered. In this type of construction the runner `block 64 is provided with an annular clamp 65 held b the bolts 66, and between this clamp and t e blockis secured a rubber. diaphragm 67 correspond' ing to the diaphragms 8 of Fig-1, but provided with perforations 68, the inner edgef of the diaphragm being clamped to the sleeve 69 by means of the bolts 70., The upper end of the'sleeve 69 is threaded to -a cap 71 and this cap is secured against the lower side of the runner frame 72 by means of the bolt 73 which has a collaror shoulder 74 fitting between. the top of the sleeve 69 and the iiange Y 'on the cap 71. The lower portion of the bolt 7 3 acts asa spindle or pivot, the v'sleeve 69 serving as the bearing therefor. The clamp 65 is provided, with a splash wall75 and the' space inside of this wall is fed with a rouge mixture from the ypipe 76 leading "romone of the annular troughs or 'grooves 77 such troughs or grooves abeing fed by means of the pipes 78 corresponding to the pipes 28 to 32 oi' the Fig. 1 construction. In thisconstruction as in that of Fig. 1, thediaphra'gm which connects the runner blocky to the spindle is relatively flexible so that` the runner block can adjust itself to the surface ofthe glass.` Also in this construction as in that v of Fig. 1, the lower ends of the pipes leading to the annular troughs are supported by means of abracket 79 clamped around the` lower endl of the spindle housing.

What I claim is:

l. In combination in polishing apparatus,

a runnerl frame, havingon its upper side a plurality of concentric annular troughs, a plurality of runner blocks carried by the frame, annular" olishin discsof yielding material carried y the b ocks, a' conduit exdown to each o-said troughs for tending supplying a polishingmixture thereto, and conduits leading from the troughs tothe openings at the centers of the discs. y

2. In combination in polishing apparatus,

a runner frame, a plurality o-runner blocks carried thereby, a plurality of conduits for `conducting a polishing mixture to the runner blocks, a container foi-.the polishing mix-` ture, and a rotating device-,in said container provided with a plurality'of buckets, one for' each conduit, arrangedso that on the Arotation of the devicey each bucket dips up a quantity of the mixture anddischarges it into its conduit.

v3. In combination ingpolishing apparatus, a runner frame having on its upper si-de a plurality of concentric :annular '.troughs, a plurality of runner blocks carried bythe -frame and each provided with. a .facing of frame and each providedwith a facing-ot yielding material, a conduit extending down to each of said troughs for supplying a polishing mixture thereto, means for supplying a polishing mixture to` 'said conduits one` aft-er the other at timed intervalsgfand conduits leading from said troughs to a posit-ion 'of discharge adjacent the runner blocks.

5. Inv combination in polishing apparatus, i .e5l .y

a runner frame, a plurality ofy runnerV blocks carried thereby,a plurality'of conduitsV for conduct-ing a polishing mixture to the runner blocks, a containerufor the polishing mixture, and a rotating device in said container' provided with av plurality ofbucketsgvone for each conduit, arranged in series around said rotating devlce So that on,tl1ejrotat1o n of dip up a yportion offthe mixture and discharge it tooneof said conduits. 1 v i In testimony whereof, I have hereunto su-bscribed my name this 25th day lof O ct. v1923.

' I HALBERT Kl' HITCHCOCK.

. the device, thebuckets oneV after' the other

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