US1872426A - Surfacing machine - Google Patents

Description

16, 1932- J. DRAKE ET AL 72,426

SURFACING MACHINE Filed June 28, 1929 4 Sheets-Sheet 1 I a wvc'nior 15 .L IIZI.. El- JEhnLDra/(e Le/Po LHandy 5 Aug. 16, 1932.

J. L. DRAKE ET AL 1,872,426

SURFACING MACHINE 4 Sheets-Sheet 2.

Fild June 28, 1929 msm 44 d 45 "as IE :1. c: John LDra/(e Le P07 1.4 Handy atbomq Patented Aug. 16, 1932 UNITED STAT ES PATENT OFFICE JOHN L. DRAKE AND LE ROY L. HANDY, OF TOLEDO, OHIO, ASSIGNORS TO LIBBEY- OWEN S-FORD GLASS COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO SURFAGING MACHINE Application filed June 28,

The present invention relates to improvements in surfacing maclnnes and particularly to grinding machines for treating sheets or the spindles of the grinding heads or runi ners are driven and the glass, mounted on degree.

cars or carriers, is carried beneath the runners of a series of machines. g

An important object of the invention is the provision of improved means for connecting the grinding head or runner of the machine to its drive spindle whereby to permit movement of said runner relative to said spindle to compensate for any irregularities of the glass or unevenness on the glass surface.

Another object of the invention resides in the provision of an improved type of connection between the grinding head or runner of the machine and its spindle which will notonly permit a limited and variable amount of universal rocking movement of said runner with respect to said spindle but which will further permit vertical movement of the grinding runner as a whole so that said runner will gradually lower relative'to the spindle as the grinding lugs or projections thereon wear away.

A further object of the invention resides in the provision of novelmeans for indicating to the operator when the grinding lugs or projections on the grinding head or runner have become worn to a predetermined Still another object resides in the provision of improved means for efi'ecting the raising and lowering of the grinding head or runner relative to the glass, together with means forlimiting and automatically stopping the upward movement thereof.

Other objects and advantages of the invention will become more apparent during the course of the following description when taken in connection with drawings. p

In the drawings forming a part of this application and wherein like numerals are 1 after described.

and carried or mounted the accompanying 1929. Serial no. 374,404.

employed to designate. like parts throughout the same.-

Fig. 1 is an elevation of'a grinding machine, partially in section, and embodying the present invention. p

Fig. 2 is a vertical sectional view through the grinding runner and the means for connecting the same to its spindle.

Fig. 3 is a section taken substantially on line 33 of Fig. 2.

Fig. 4 is a section taken substantially on line 44 of 3.

' Fig. '5 is a section taken substantially on line 5-5 of Fig. 4.

Fig. 6 is a view similar to Fig. 4but disclosing a slightly modified construction.

Fig. 7 a is a section taken substantially on line 7-7 of Fig. 6, and

Figs. 8,9 and 10 are diagrammatic views illustrating the electrically actuated means for. limiting the upward movement of the grinding runner and automatically stopping the same.

As illustrated in Fig. 1, the glass sheets to be surfaced may be secured upon the tops of a plurality of tables 12 mounted "upon Wheels 13 riding, on rails 14, said tables being driven in any suitable manner to carry the glass sheets beneath a plurality of grinding machines of the character tobe herein- In the drawings, the letter A designates ed in accordance with the present invention upon a supporting frame B. The frame B consists, briefly stated, of a hub 15 from which extend a plu rality of substantially horizontal supporting arms 16, 17 and 18 mounted at their out I er ends upon suitable supporting columns 19 and 20, said hub 15 being provided with an internal recess having araised bearing portion 21 at substantially the center thereof. The grinding machine A embodies a housing 22 mounted upon the hub 15 of the supporting frame B andthrough which passes the vertical drive spindle or shaft 23 journaled intermediate its ends within the bearing 21 and carrying at its lower end the grinding head or runner 24 whichconsists .the drive: spindle 23 vide novel and improved means of said runner but .is secured to the runner rality of bolts or the l'ke portions 40 and s jecting end of a main casting or base member 25 having secured to the bottom face thereof a plurality of metallic grinding lugs or projections 26. Slidably keyed to the drive spindle 23 and located within the recess in hub of the supporting frame B is a worm gear 2'? driven from the motor 28 through the motor shaft 29 and a worm (not shown) but which meshes with the worm gear 27. The motor 28, it will be noted, is mounted upon the supporting column to one side of the machine.

The upper carries a threaded sleeve 30 upon. which is threaded the rotatablebut non-s'lidablenut '31 carrying a wormjgear'32 driven through suitable drive connections from a motor '38 supported upon" the horizontal platform 34 carried by housing 22. Upon operation of motor 33 to effect rotation of worm gear 32 and-nut 31, the: sleeve 30 and consequently will be threaded upwardly or downwardly through said nut dependentupori the directiQn of rotation-thereof to effect either a raising or a lowering of the. grinding head or runner 24..

An aim of the present invention isto profor securing the'grinding head or runner 24 to its spindle 23 in order to permit not only a limited and variable; amount of rocking movement I also a bodily vertical movement thereof with respect to said spindle; To this end, there is mounted upon the V trally thereof,

base member 25 ct grinding runner, 24 cenan annular housing 35. adaptedto receive therein the lower end of the drive spindle 23. The annular housing35 by means of a plu- 36, and is provided with a fixed top. or cover plate 37,..' The lowj erend of the spindle 23. received within the housing 35 is formed nular head 3.8v through which, extends the transverse pin 39' rotatably mounted therein.

with, an. enlarged an- The pin 39' projects at its opposite ends beyond the head 38 and the projecting] end 41 thereof are formed with opposite flatv side faces 42 and 43. Theproportions and 41 of pin 39 are loosely received within vertically extended openings 44 in bushings 45. fitted within v diametrically opposite recesses 46 formed in the annular housing 35. It will be noted that the vertical extent of the openings 44 in bushings is considerably greater than the vertical extent of the projecting end por tions 40 and 41 of pin, 39 so that while the ends of the pin do not have any rota-tive movement within the bushings, yet they are permitted to move vertically relative thereto.,i In other words, there is considerable clearancerspace between the projecting end portions of the pin 39and the cover plate rotatably mounted within the head end of the drive spindle 23 spherical the member 49 remaining stationary downward movement of said runner having a recess urge the member 49 inwardly as at and positioned opposite the. spindle head 38 is lowered within honiturncd portion 55 of member 50 shou l With such a construction, and upon rotation of spindle 23, the runner 24 will be positively driven due to the engagement of the projecting end portions of pin 39 with the annular housing 35. Since the pin 39 is 38 of spindle the runner 24 will be permitted to rock about the same and likewise the runner will also be permitted to rock in a direction at right angles with respect to its first iOClZ- ingmovement due-to the vertical extent of the openings 44. The runner will also be permitted a certain amount of vertical bodily movement with respect to the spindle. The upper surface 47 of head 38 of spindle 23 is and the undersurface 48 of the cover plate 37 is correspondingly shaped so that even when therunner is lowered to such a position that the cover plate will rest upon the head, the runner will still be permitted acertain amount of rocking movement.

This invention also embodies means for indicating to the operator when the grinding projections 26 on the grinding runner become worn to a predetermined degree or to the extent that they should be removed and new grinding projections substituted therefor. This indicating means includes the vertical- 1y disposed. cooperating indicating members or pins 49 and 50 carried by the runner 4, upon while the member 50 moves therewith. Th cover plate 3? of. housing 85 is provided at one point with a vertically thickened portion 51 in the undersurface thereof fitted a cup member 52 havillan opening its bottom. The stationmember 49'project-s downwardly through the cup member-and engages the upper surfaceof the adjacent reduced end portion of the pin. 39 and, as shown in Fig. 2, the end portion 40. Encircling the member 49 withincup 52 is a compression spring 53 bearing at its upper end anst cover plate 37 and at its lower end aga let a collar or flange on pin 49, said spring acting to normally 7 V downwardly into engagement with the reduced end 49 of pin 39. The movable member 50 is threaded at its with-in which is "lower end within an opening. in the cover plate 8? and the upper end thereof is turned member 49.. In practice, when the gr nc Mg projections 26 are new and the runner is properly lowered into contact with the glass,

ing 35 until the members 49 1nd 5O assuir the ositions with respect to one another a indicatedhy the full lines in Figs. 3 and 5. In other words, the lower cdo'e of the iiioer end of .mcmber 49; However, as the grinding pro- ]ect10ns.- b ecome worn, the runner will b stationary. Vhen the gradually lowered and upon lowering of said runner the member 50 will be carried therewith while the member 49 will remain member 50 reaches the positionindicated by the broken lines in Fig. it will indicate to the operator that the grinding projections have become worn to the extent that they should be replaced. A boot 56 encircles the cover plate 37 and spindle 23 to prevent oil or abrasive material from passing downwardly aroundthe spin dle into housing and a similar boot. 57 is secured to and encircles the thickened portion 51 or cover plate '37 and member 49.

In Figs. 6 and 7 is disclosed a somewhat modified construction wherein the transverse pin 39 is eliminated and in its stead are provided the four pins 58,59, and 61. The pins 58 and 60 are threaded into the head 38 of spindle 23 at diametrically opposite points while the pins 59 and 61, which are positioned at right angles to the pins 58 and 60, are also threaded into the head at diametrically opposite points. The outer end of each pin 58 to 61 is rotatably received within a substantially square bushing 62 fitted within a recess 63 formed in the annular housing 35. Upon reference to Fig. 7, it will be seen that the vertical extent of the recess is considerably greater than that of the bushing so that while the bushing is prevented from rotating within the recess it is movable vertically therein. 'lVith such a construction, the runner will be permitted to rock in two different directions-at substane tially right anglesto one another and will also be allowed a certain amount of vertical bodily movement. The runner can rock in one direction upon the pins 58 and 60 and in a direction atright angles thereto'upon the pins 59 and 61. The improved indicating means above described can also be incorporated with this form of apparatus as shown in Fig. 7

The present invention further embodies electrically operated means for not only raising and lowering the grinding runner with respect to the glass, upward movement thereof and automatically stopping the same when it reaches a pre-, determined position. Thus, there is mounted upon the upper end of houslng 22 of grinding machine A a casing 64 carrying a switch including the fixed and movable contacts 65 and 66 respectively (Fig. 8), the movable contact 66 being carried at thesforward end of a lever 67 pivoted intermediate its end as at 68 and normally held in engagement with the fixed contact by means of the spring 69. The numeral 70 designates a second switch adapted to be positioned within convenient reach of the operator and having the three contacts 71, 72 and 73. The switch 70 also includes the contact fingers 74 and 75 adaptedtfor engagement at any one time with any two adj acent" contacts 'tion as shown on the switch casing.

and 73 by the spring 77 :rotates the same but for also limiting the 71, 72 and 73 and fixed to a shaft 76, said contact fingers being normally maintained in an open or neutral posiin Fig. 8 by a tension spring 77.

Leading from the fixed contact 65 is a wire 78 connected to the motor 33 while running from the movable contact 67 is a wire 79 connected with the contact 71 of switch 70. Secured to the contact 73 of switch 7 O is a second wire 80 running'to the motor 33 and wires 81 and 82-lead from the contact 7 2 of switch 70 and motor 33 respectively and are connectedwith'the positive" and negative main lines 83 and 84. Carried by the shaft 76 of switch 70 is a head or hand gripping portion 85 having an indicator 86 which is adapted to register,-upon turning of said hand portion, with the words Up Down and Off written Mounted above the lever 67 carrying the movable contact 66 is an arm 87 pivoted intermediate its ends as at 88 and-carrying at its rear end a knock-out bolt or thelike 89 adapted to engage the rear end of lever 67'and to swing the same about its pivot 68 to disengage the movable contact 66 fromifixed contact 65.

In operation, duringthe grinding of the glass, the contact fingers74 and 75 of switch 70 are held in theposition indicated in Fig. 8 and out of contact with the contacts 71, 72 1 so that this switch is open. At such time, the contacts 65 and 66 are held inengagementby spring 69 and the arm 87 assumes the position indicated in Fig. WVhen it is desired .to move the grinding runner 24 upwardly, the operator grasps the hand gripping portion 85 of switch 70 and to move the indicator 86 opposite the word Up and upon such move ment the contact fingers 74 and 75 will be moved to engage contacts 71 and 72 respectively and thus close the switch, The electric current will then enter through the positive 'main 83 and will pass successively through wire 81, contact 7 contact 66, then through stationary contact 65 and wire 78 to motor 33 and from motor 33 through wire 82 to negative main 84thereby completing the electric circuit. Upon ro 'tation of motor 33 as above described, the

nut '31 will be driven so that the sleeve 30 carried by spindle 23 will be threaded up- .the knock-out bolt 89 engaging the rear end of lever 67 will so as to move the movablecontact 66 out of rock the same about its pivot engagement'with stationary contact 65 and thus breakth'e circuit through motor 33 and 2, contact fingersIlO 75 and 74, contact 71 and wire 79 to movable automatically bring the upward movement of fingers 74 and 75 of said switch will be brought to engage contacts 7 2 and 73 respectively. The electric current will then enter through the positive main 83, and pass successively through wire 81, contact 72, contact fingers 74 and 7 5, contact 7 3 and wire 80 to motor 33 and from motor 33 through wire 82 to negative mainS to complete the circuit. Upon this operation of the motor 33, the nut 31 will be rotated in the opposite direction to thread the sleeve 30 downwardly therethrough and thus effect the desired lowering of runner 24. During the lowering of the spindle, it is necessary for the operator to'hold the switch 70 in its Down position since the spring 7 7 tends to urge it normally to its Ofi position. This insures the grinding head stopping when the hand of the operator is removed from the switch. As the grinding head approaches the proper position with respect to the glass, the switch 70 may be turned ofi and on intermittently so as to provide a gradual lowering of the runner into place. The grinding head moves upwardly and downwardly so slowly that there is practically no danger of it injuring the glass as it drops. When the spindle is lowered, the spring 69 will again return the contact 66 into engagementwith contacts and the weight of the forward end of lever 87 will cause it to again assume its normal positionindicated in Fig. 9 so that the various parts of the apparatus will again be in position to permit the raising of the grinding runner.

It is to be understood that the form of the invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subj oined claims.

We claim:

1. In combination in apparatus for surfacing glass, a vertical runner spindle, a grinding runner including a housing for receiving the lower end of the spindle therein, means for connecting the housing to the spindle in a manner to permit a bodily lowering movement of the runner relative to the spindle, as said runner wears away, and means carried by the housing for indicating to the operator the wear upon said runner.

2. In combination in apparatus for surfacing glass, a vertical runner spindle, a grinding runner including a housing for receiving the lower end of the spindle. therein, means'for connecting the housing to the spin- "dle in a manner to permit a bodily lowering movement of the runner relative to the spindle, .as said runner wears away, and cooperating stationary and movable mea us carried by the housing for indicating to the operator the wear upon said runner.

3. In combination in apparatus for surfacing glass, a vertical runner spindle, a grinding runner including a housing for receiving the lower end of the spindle therein, means for connecting the housing to the spindle in a manner to permit a bodily lowering movement of. the runner relative to the spindle, as said runner wears away, and means carried by the housing for indicating to the operator the wear upon said runner, said means including a vertical member passing loosely through the top of said housing and normally maintained in a fixed position, and a second vertical member secured to the housing opposite the first member and adapted to move downwardly therewith.

4. In combination in apparatus for surfacing glass, a vertical runner spindle, a grinding runner including a housing for receiving the lower end of the spindle therein, a transyerse pin carried by said spindle and proecting therebeyond at opposite ends thereof, the projecting end portions of said pin engaging said housing to effect rotation thereof and to also allow a bodily lowering movement of the runner relative to the spindle as said runner wears away, and means carried by the housing for indicating to the operator the wear upon said runner, said means including a vertical member passing loosely through the top of said housing and normallymaintained in a fixed position, means acting to urge said member downwardly into engagement with one of the projecting end portions of said transverse pin, and a second vertical member secured to the housing opposite the first member and adapted to move downwardly therewith.

5. In combination in apparatus for surfacing glass, a vertical runner spindle, a grinding runner including a housing for receiving the lower end of the spindle therein, said housing being provided with opposed vertically elongated recesses, a transverse pin carried by said spindle and projecting therebeyond at opposite ends thereof, the projecting end portions of said pin being loosely received within said recesses to effect rotation of the housing and to also allow a bodily lowering movement of the runner relative to the spindle as said runner wears away, and means carried by the housing for indicating to the operator the wear upon said runner, said means including a vertical member passing loosely through the top of said housing and normally maintained in a fixed position, spring meanswithin the housing acting to urge said member downwardly into engagement with one of the projecting end portions

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