US1610374A

US1610374A - Apparatus for cleaning plate-glass-grinding tables or cars

Info

Publication number: US1610374A
Application number: US16409A
Authority: US
Inventors: Herman S Heichert; Albert E Evans
Original assignee: Pittsburgh Plate Glass Co
Current assignee: PPG Industries Inc
Priority date: 1925-03-18
Filing date: 1925-03-18
Publication date: 1926-12-14
Anticipated expiration: 1943-12-14

Description

Dec. 14., 1926. 1,610.374

H. SfHElCHERT ET AL APPARATUS FOR CLEANING PLATE GLASS GRINDING TABLES 0R CARS Filed March 18 L925 3 Sheets-Sheet 1 but a v m fij Dec. 14, 1926. 4 1, 10,374 I H. S. HEI CHERT ET AL APPARATUS FOR CLEANING PLATE GLASS-GRINDING TABLES on CARS Filed March 18. 1925 Sheets-Sheet 2 25 23 i 1a 1a INVENTOR #QWQ 1925 3 Sheets-Shes? 5 INVENTOR 5% H. s. HEI'CHERT ET AL Filed March 18 Dec. 14 1926.

APPARATUS FOR CLEANING PLATE GLASS GRINDING TABLES 0R CARS Patented-Dec. 1.4, 1926.

UNITED STA TES PATENT OFFICE-- HERMAN HEIGHERT AND ALBERT E. S, 0F PITTSBURGH, PENNSYLVANIL AS SIGNORS TO PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENN SYL- VAiN IA.

APPARATUS FOR CLEANING PLATE-GLASS-GRINDING TABLES OR CARS.

Application filed fiarch 1a, 1925. Serial u 16,469.

The invention relates'to apparatus for removing the plaster from plate glass supporting tables or cars suchas are employed in a straight away grinding and polishing operation recently developed in this country.

The glassislieets' are secured to the tops of the tables by plaster of Paris and after the. sheets have been ground and polished and "pried loose from the plaster, it becomes necessary to remove the layer of plaster remainin preliminar to tie application of anot er sheet. complished by hand labor, the workers climbing upon the tables with scrapers and poundingfand scraping the surfaces of the car to remoye the relatively hard adherent plaster} The difficulty of the operation is increased by the woo holding pegs which are arran ed in series along each side of the car with their upper ends projecting slightly above the surface of the car. These pegs prevent the scrapersfrom sliding clear to the edges of the tables so that it becomes necessary to drive each one down so that its top is flush with the top surface of the table, which operation takes considerable time and effort. The present invention is desi ned to provide-for the removal of the hard ayer of plaster without hand labor and also to automaticall drive the pegs down out of the way so t at the table is completely freed from plaster from edge to edge. It is further designed to accomplish this result without cutting or wearing away the tops of the cars or tables, being so arranged that a thin film of protecting plaster is left on the surface of each car. This film of plaster has been found to give a firmer connection with the fresh plaster which is applied than was secured between.-the table tops and the fresh plasten when the film was completely removed'so that the danger of the sheets becoming loosened during the subsequent grinding and polishing operation is materially reduced. In carrying out the operation, a brush made up of metallic strips or fibers is referably employed (although some other orm of cutter might be used) for cutting away the plaster, and the life of this cutting member and also that of the holding pegs is greatly increased by the expedient'of forcing down the pegs preliminary tothe application of the cutter. It has also been found desirable to apply scraper eretofore, this has been acmeans both in front'of and behind the cutting brush, the one in advance serving to clear away any broken glass or other detritus left on the surface of the plaster, and the one following the brush serving to wipe away any loose plaster left after thecutting operation, the latter function being facilitated by a plying a flow of water along the scraper. is illustrated in the accompanying drawings wherein:

Figure 1 is a sectional plan vie-w of the apparatus. Fig. 2 isa sectional side elevation. Fig. 3 is-a sectional rear elevation. Fig. 4 is a front elevation. Figs. 5 and 6 are enlarged detail elevations of the laster crushing and peg pushin devices, ig. 5 being a side elevation and Fig. 6 being a plan view. Fi 7 is an enlarged section on ne embodiment of the invention rack bars 6 secured to the bottoms of the I cars or tables. The spurgears are them selves rotated from the drive shafts 7 by meansof pinions 8.meshing with such spur gears. The track 4 is a continuation of the track u on which the cars are carried be.- neath t e grinders and polishers and the cars are moved beneath such .grinders and polishers by operating means, of which the

parts

5, 6, 7 and 8 constitute a unit.

9 are the wood pegs arranged in series along each side of the tables and cars and serve as positive means for holding the glass on the tables against lateral movement. These pegs have a driving fit in the openings extending through the metal table tops so a tri e belowthe top surface of the glass. 4

. taneously crushing the plaster 13 (Fig.

along the sides of the tables and surrounding the pegs. The devices for automatically accomplishing this purpose as the tables move along consist of a pair -of shoes or cams 14 having their lower surfaces rounded as indicated at 15 and secured by means of the bolts 16 to the yokes 17. The yokes 17 are supported from the transverse beam 12 by means of brackets 18 to which the yokes are pivoted by means of the rods 19.

The other ends' of the yokes are pressed yieldingly downward by means of springs 20 bearing upon the yokes and held under compression by means of the nuts 21 upon the vertical threaded rods 22. These rods [extend through brackets 23 bolted to the beam 12. They are threaded into sleeves 24 fitting into the brackets and each sleeve may be rotated to move the-rod up and down and so adjust thetension of thespring 20 by means of the nut 25 keyed to the upper end of the sleeve and provided with the handle 26.

Lock nuts

27 and 28 serve .to fix the positions ofthe nuts 25 and 21 respectively. By this means the pressure of the shoes can be adjusted to. exactly the right amount in order to crush the plaster and push the pins down'and at'the same time not exert an undue amount of pressure on the table tops. The" shoes 14 thus serve to break up the plaster at the edges of the table and press the pins 9 down so that the cutter device (the brush as later described) can properly perform its function of cleaning the table throughout its width and also re u ce the Wear upon the brush and pins such as would be involved if the pins were not pressed down out of the way. The shoes constitute only one of a number of possible devices that might be employed for accomplishing the desired function, such shoes, however, constituting thebest means so far developed for performing. this function.

Mounted on opposite sides of the track are a. pair of

standards

29 and 30 for supporting the transverse frame 31 upon which the rotatin cutter brush 32 is" mounted. This frame is pivotally supported at one end upon the pivot rod 33 carried'by the stand-' ard 29, while the other end of the frame is releasably supported upon the standard 30 by bolts (not shown) so-that'upon the release of the frame from the standard 30,

it may be swung around the pivot rod this. being a desirable arrangement under certain conditions. The frame is provided with a pivot shaft 34 upon which are mounted the swinging arms, 35 and 36 in which the ends ofthe brush 32 are journalled. The arm 35 has an extension or platform 37 on the opposite side of the shaft 34 on which is mounted the motor 38 for driving the brush 32 through the intermediary of a pair of sprocket wheels 39 and 40 on the ends of the motor shaft and brush shaft respectively and the sprocket chain 41.

The brush is made up of radial fibers in the form of light metal strips which have an abraiding effect upon the plaster on the table when the brush is driven at' a high.

rate of speed, and means are provided for adjusting the pressure of the brush upon the plaster so that just the right amount of cutting pressure may be exerted in order to cut away the major portion of the plaster, leaving the thin film heretofore referred This method of procedure not only prevents the gradual Wearing away of the top surface of the table, such as would occur if the entire layer of plaster were cut away, but it. has also been found that there is less tendency of the glass sheets to loosen during the grinding and polishing operationwhen the fresh plaster is laid upon a film of plaster than is the case when the fresh plaster is applied directly to the metal llll) table tops. The adjusting device for the brush comprises a bracket 42 secured to the bottom of the 'motor support 37 and the threaded rod 43' extending through the hub 44 integral with the standard 29 and adjustable by means of the hand wheel 45 provided with a suitable nut. A spring 46 is interposed between the end of the bracket 42 and the bottom of the hub 44 which serves to move the brush upward as the nut 47 is unscrewed.

In order to remove any loose glass or other detritus on the forward side of the brush, a wood scraper 48 is employed, (see Fig. 7) such scraper being supported by means of

suitable brackets

49 and 52 secured to the frame 31. A flow of water over the surface of the table onthis side of the brush is also provided from the pipe 50,. the purpose being to soften the plaster preliminary to the action of the cutting brush. A scraper 51 is also provided on the other side of the brush in order to clean the surface of the tables from loose plaster left by the action of the brush. This scraper is also supported from the frame 31 by means of the

brackets

52 and 55 and a pair of rubberstrips 53 between which I water is supplied-from a pipe 54. The

brackets

49, 52 and 55, above referred to,- for supporting the scrapers are preferably in the form of bars or strips of metal arranged at" spaced intervals and bolted to the frame 31; This gives an effective cleaning ofithe table tops and places them in condition so that they are ready for the appliacross the tables behind the cutter device,

and means positioned at one side of the tables for directing a supply of water across the tables along the side of said scraper means.

2. Apparatus for cleaning plaster from tables mounted for movement along a track,

comprising a cutter device mounted for rotation above the track and adjusted so that it will cut away the major portion of the plaster upon the tables leaving .a thin film remaining on the tables, power means for rotating the cutter device, and scraper means located across the tables in front of said cutter-device and behind such device.

3. Apparatus for cleaningv plaster from tables mounted for movement along a track, comprising a rotary brush extending across the 'track and provided with radially ex tending metallic fibers, an adjustable tilting frame carrying the brush and power means for rotating the' brush at a high rate of speed so as to cut the plaster from the tables as they pass beneath the brush, said power means being supported from said'frame;

4. Apparatus for cleaning plaster from tables mounted for movement along a track and provided along each side with vertically movable glass holding pegs projecting above the surfaces of the tables, comprising a cutter device mounted above the tables so as to engage the plaster thereon as the tables move beneath such cutter and a cam device on each side of the tables in advance of the cutter adapted to engage and crush the plaster along the sides of the tables and to force the holding pegs downwardso that their upper ends are flush with'the surfaces of the tables.

5. Apparatus for cleaning plaster from tables mounted for movement along a track and provided along each side with vertically movable glass holding pegs projecting above the surfaces of the tables, comprising a power driven cutter device mounted for-ro tation above the track, and adapted .to cutaway the'plaster on the tables and the pass therebeneath, and a cam device on each. side i of the tables in advance of the cutter adapted to engage and crush the plaster along the -sides of the tables and to force the holding pegs downward so that their upper ends are flush with the surfaces of the, tables;

6. Apparatus for cleaning plaster from tables mounted for movement along a track and provided along each side with vertically movable glass holding pegs projecting above the surfaces of the tables, comprising a cutter device mounted above the tables so as to engage the plaster thereon as the tables move beneath such cutter, and a shoe on each side of the tables in advance of the cutter" .7. Apparatus for cleaning plaster from tables mounted for movement along a track and provided along each side with vertically movable glass holding pegs projecting above the surfaces of the tables, comprising a cut- I ter device mounted above the tables so as to engage the plaster thereon as the tables move beneath such cutter,*and a shoe on each side of the tables in advance of the-cutter i yieldingly pressed downward and having its forward end inclined upward and adapted to ,engage and crush the plaster along the I sides of the tables and to force the holding movable glass holding pegs projecting above the surfaces of the tables, comprising a cutter device mounted above the tables so as to engage the plaster thereon as the tablesmove beneath such cutter, a cam device on each side of the tables in advance of the cutter adapted to engage and crush the plaster along the sides of the table and force the pegs downward, yielding means for pressing such devices downward, and means for adjusting the pressure of said yielding means. 9. Apparatus for cleaning plaster from tables mounted for movement along a track and provided along each side with vertically movable. glass holding pegs projecting above the surfaces of the tables, comprising a presser device on each side of the tables above theside edges of the tables, adapted to engage and crush the plaster along such side edges and to force the holding pegs downward so that their upper ends are flush with the surfaces of the tables. I

10. Apparatus for cleaning plaster fron tables mounted for movement along a track and provided along each side with vertically movable glass holding pegs pro ect1ng above the surfaces of the tables, comprising a presser device on each side of the tables above the side edges of the tables, and yielding means for forcing such devices downwardso that they engage and crush the plaster along such side edges and force the holding pegs downward so that their upper ends are flush with the surfaces of the tables.

11. Apparatus for cleaning plaster from tables mounted for movement along a track and provided along each side with vertically movable glass holding pegs projecting above the surfaces of the tables, comprising a presser device on each side of the tables above the side edges of the tables, yielding means for forcing such devices downward so movable glass holding pegs projecting above the surfaces of the tables, comprising a shoe on each side of the tables above the side edges thereof and" having its forward end turned up, adapted to enga 'e and crush the plaster along such side edges and to force the holding pegs'downward so' that their upper ends are flush with the surfaces of the tables.

13. Apparatus for cleaning plaster from tables mounted for movement along a track, comprising a frame extending transversely across the tables and pivotally supported at one end so that it may be swung laterally to bring it to one side of the tables, a brush mounted for rotation in the frame and provided with radially extending metallic fibers adapted to cut the plaster when the brush is rotated at a high rate of speed, and a motor also mounted upon the frame and having driving connection with the brush.

Intestimony whereof, we have hereunto subscribed our names this 16th day of March, 1925;

S. E. EVANS.