US2598405A - Glass grinding machine - Google Patents

Description

May 27, 1952 MARCHAND 2,598,405

GLASS GRINDING MACHINE Filed Feb. 25, 1949 4 Sheets-Sheet 1 COM PRESSOR F FROM AIR May 27, 1952 MARCHAND 2,598,405

GLASS GRINDING MACHINE Filed Feb. 23, 1949 4 Sheets-Sheet 2 May 27, 1952 MARCHAND 2,598,405

GLASS GRINDING MACHINE Filed Feb. 23, 1949 4 Sheets-Sheet 3 IN VEN TOR.

y 27, 1952 A. MARCHAND 2,598,405

GLASS GRINDING MACHINE Filed Feb. 23, 1949 4 Sheets-Sheet 4 INVENTOR.

.IYYUWW Patented May 27, 19.52

UNITED STATES PATENT OFFICE GLASS GRINDING MAGHWE Ado ph Ma c nd, J acksen Heights N'- Y Application Februaryflit, 1949, Serial No. 771.719

(o1. sr-oe) 41 Claims.

The object of the present invention is to provide a grinding machine adapted for bevelling and "seaming? glass in plate form, and ithas for its; particular object. to; provide. av machine of s u ch character which. Will ac ura e y bevel 1'' see he entir m e nse e g ass pla eeplying a controlled pressure between the grind-. ing; roll; or mill and the. margin of a glassplate held upona. supporting table, which will enable ready adjustment of. the table teward and: from the. grinding roll, which: will automatically feed a grinding; medium to the grindingvroll, and which. have. simple and efiiective release mechanism.

The invention will be described. with reference to the accompanying. drawings, in which;v

Fig. 1- is-a perspective-view partly broken away showing an embodiment of the invention;

Fig. 2- is afragmentary perspective-view showing; the driving: means for the grinding roll;

Fig. 3 is. a fragmentary section taken vertically onthe; line 3.-3, l-;

Fig. lis an enlarged transverse section on the line- 4-4. .1-;

a 5.- .is an en a ged mentary s ct on on the line; 5 -51, 1;

Fi 6 is: a. d tail ie partly broken way show n latchand release means f r the. table. the. tabks beingv in: hor zontal positi ns.

ie- Tis. a view s m ar to Fi 6 showing the table, latched n pe a i in ined position;

F g; 8 a view partly br ken away show n the; table: frame and; table. to et er w thv the. e leas m chan sm as to onenferm ther ei.;..

Fi .9 s a detai ed. corner section taken hold.- zontally onthe; line 9-9., Fie- F 10 a; ve ti a section throu h the. re.- lease. lever; box taken vertically on. the line toe-lit Fi 8.;

Fig; 11 is a detailed and fragmentary P spective-view showing. amodification incorporating: means; for slowly vibrating the table frame and: tabl the i we -ns n. pa t al s ct on Re erring to the drawings. t w ll b se n from Fi .1 that. the.- maehine coz isrisesv endframe members wh eh inpraetice are tied by inter:- mediate t e f a es. whic a not. showni-n: the:

rawi s- Eachv ir me member I ha Welded or bolted the eto a -m m r wh h uppor s the lower bearing block 3- which inturn; has.

secured thereto a bearing strap 4, the two elemeritsv providing a sleeve bearing for a. shaft 5.

This shaft may extend through a. roll 6* which. hasmountedthereon a'east iron y in e "L t e fees h reof be ng. smoothly machined. n pres-- bearing block 28 which tice. The shaft. 5. at one. end has. secur.edthere.- to a groovedpulley 9- hayina a belt connection m. with a drivenpulley ll on a shaft 12 secured by a bearin block and strap. arrangement gene erall-yv indicated at t3. Fig, 2 on one of the primary frame members I. The power device is a. motor M having a driven pulley t5 connected bybelt assembly It, with a large: pu leyn on shaft .12.

Car ied by u shaped r sets t. extending p:- wardlyfrom primary frame members I. is are: moi/ablefeed, box Ila: for grinding material. This grindingmaterial may be granular "Carborundum in a water bath. Fig. 4 shows a cross section. through box. l-lzr with the aqueous and Carborundum con-tent. ind cated at [8; As shown in. Figs. 3. and (i the bottom of box liqc is apertured in communication with dis: charge nipplesllqrzr. and means may. be. provided for simultaneously or individually controlling flow from the nipples by a. suitable valve are rangement. In Figs. 1 and 4 of the drawing; the; means. indicated is, for individual control. of the nipples by means of pivoted door-like elements, [9,. the base of each. nipple being cut at an angle and members l9. being pivoted at 2.0 Fig, 4. Thusby swinging, members I9. the. nip: n es ma e enti ely cl s d r opened pa t al or completely.

The immediate carriers for box are rods: 20:10 which may rest in the channels of saddlev plates; 2| secured to the tops. of the frame extensions Ia:..

As shown in .F e- 4 ni p es d c ar e the granular material somewhat. inwardly of a. tan gentialline. meeting the grinding roll Le-Bennie: what verticall-y; The grinding roll; rotates clockwise and the spent grinding material drops downwardly into a collection box 2l-a: Fig. 14., which box may carry supporting rollers 22. and

the latter when. the box is, in. position. may be.

held uponv a support .23 under the. grinding roll ssemblyhe-.surpertmay ha e a t p m mber 24.

Forwardly 0f. the grinding. roll; assembly and.

mounted on each, primary. framemember I- is a strap. and block securedshaft .25. which. serves asva p o sup or -fer one end o he table he ding frame. This-frame isshown, best in Fig. 8, and. is arectangular member: formed. of com nected. Uechannel bars, the frame being, gen.- erally indicated at 2.6. At each. side. of the. table: frame there is ded or otherwise seeure thereto. a heavy plate 2'!- having. bolted thereto 3,.

receives sham-g5, the.

latter being loosely held in place by a strap 29. As stated, this arrangement is at each end of the table frame and therefor the table frame can swing on the two shafts 25.

The table frame 26 supports a table 38, which may be of wood. It is movable toward and from the grinding roll. Two guide blocks 3| may be secured to the under face of the table for abutment with the side bars of the table frame, one of said guide blocks being shown in Fig. 4 at El. Depending from the table 3!] is a worm-nut 32 which receives a worm on a shaft 321:, the shaft being held in a bearing block 33, Fig. l, secured to one of the end members of the table frame. By means of a handle 34 the worm may be rotated to move the table forwardly or backwardly toward and from the grinding roll.

The table 30 is formed with suitable apertures at 3L1: so that a glass plate laid thereon, such a plate being indicated at 35, may be given an under face pressure by the hands for conveniently raising it from the table for removal. The table is provided with a rear abutment and holding member for various widths of glass plates, said member being a bar 36 undercut, as shown in Fig. 4, so that the glass may be received in the undercut and abutted at its top and edge by the bar. The adjusting means for the bar 36 consists of a T-slotted arrangement 38 at each end of the table, and two clamping member 39, best shown moved toward the grinding roll, a for example just short of edge contact with the roll, and a limit stop for the table may then be adjusted, or it may previously be adjusted, to stop the pressure of the glass upon the roll at a predetermined point, and thus limit the extent of the cut- I ting action. For example, it may be desired in some classes of edge bevelling to limit the bevels to a fraction of an inch above one face of the glass so at that face the glass edge will be blunt for a portion of its thickness and hence not go to a sharp point.

The limit stop, which is releasable, is shown more particularly in Figs. 6 and 7 and its releasing means is shown in Figure 8 as applied to two of the limit stops, one at each end of the table frame. Referring to Figure 6, it will be seen that the table frame is in horizontal position, although the frame itself is not shown and only the members 21, 23 and 29 with one of the supporting shafts 25. Heavy plate 2'! is apertured at 219: and through the aperture extends a stop or latch pawl 43 pivoted at 44 upon a bracket arm 45 carried by an angle bar 46 which, as shown in Fig. 11 may be secured to the upper extension of frame I. By means of a spring 4'! stop pawl 43 is normally held in latching position. The latch adjustment is an adjustable screw 48. Thus when the table is swung to the position of Fig. 7 the pawl 43 will move into latching position. That position is not the initial position of the table for the beginning of the cut, but will be the predetermined position at which the table will be restrained against further movement of the margin of the glass plate against the face of the grinding roll.

The initial angle of the glass plate relatively to the grinding roll determines the degree of inclination of the bevel which will be cut, whereas the adjusted position of the stop pawl 43 will determine the relative positions of grinding roll and glass plate at the end of the bevelling operation. When the table has been moved to an angle and the glass plate brought into contact with the grinding roll, through rotation of the handle 34, the gravitational pressure of the glass edge against the cutting roll will effect sufficient pressure of the glass edge upon the roll to insure the proper action. For example, and with reference to Fig. 4, the weight of the table rearwardly of the shaft axes 25 may be such as to cause a ten pound pressure of the glass against the cutting roll. A counter-spring 49 or any suitable counter-balancing means may be employed on the table frame for counter-balancing in part the weight of the table frame and the members it carries, as to that area to the right of the pivotal point 25, Fig. 4.

When a bevelling operation has been completed the glass plate may be retracted by rotation of handle 34 and the table restored to horizontal position as shown in dotted lines, Fig. 4. Preceding such return of the table to horizontal position the stop member or members 43 are released. Reference to Fig. 8 will show that the lower ends of said pivoted stop members 43 are engaged by a cable 50 which is led through guide members ti on the frame and thence to the interior of a box 52, being connected at opposite points of the pivot 53 of a hand lever 54. By moving the hand lever to the right from its position in Fig. 10, stop members 43 will be released from the table frame, and the latter may swing upwardly.

In Fig. 11 I have illustrated means for periodically giving a slight intermittent retraction to the table, and hence the glass margin, undergoing a bevelling operation. For example, the glass plate margin may be slightly retracted from the grinding roll a number of times per minute to allow the layer of grinding material to pass on the roll beyond the edge of the glass, and to maintain a more even coating of Carborundum or other grinding material on the surface of the grinding roll, particularly during the early stages of the cutting action when the sharp edge of the glass has the greatest effect as a scraper. To that end there is carried by plate 21 secured to the table frame 26 a reduction gear assembly 55 driving a cam 56 which may engage a wear plate 58 secured to the under face of the table 30, the latter carrying at each side a slide bar 51 in a slideway assembly 59 loosely mounted on shaft 25. In such case the table may have a spring connection with the worm nut 32. The reduction gear assembly leads to a shaft carrying a driven pulley 61 which receives a belt 62 leading to a pulley i0 loosely mounted on shaft 25 and in turn driven by a belt 'H leading to pulley H, Fig. 11. Of course pulley ll will have a channel for the reception of belt H in addition to the channels for the belt lengths It. Thus by operation of the cam 56, the table frame will have an intermittent slight movement independently of the frame sufficient to carry the glass plate margin a slight distance away from the grinding wheel, which distance may be restricted to a sixteenth inch or even less.

In order to aid suspension of the grinding material in its liquid carrier, I employ air jets through ducts 13, Fig. 3 leading to the interior of box Hm, preferably at the base thereof, these ducts leading to a manifold pipe I4, connected as by tubing 75, Fig. l, to an air compressor (not shown).

By means of the invention glass plates may be quickly and economically bevelled or seamed, the latter term referring to the grinding down of rough edges.

It will be understood that various modifications may be made in the form and arrangement of the elements of the embodiment illustrated and described herein, without departing from the spirit of the invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is as follows:

1. A glass bevelling machine comprising a primary frame, a longitudinal grinding roll rotatably mounted on the primary frame for rotary movement about a horizontal axis, a tiltable frame pivoted on said primary frame for pivotal movement about a horizontal axis parallel to said grinding roll axis of rotation, a glass plate-supporting table pivoted on said primary frame for pivotable movement about a horizontal axis parallel to the axes of rotation of said grinding roll and said tiltable frame, means for adjusting the angular orientation of said tiltable frame with respect to said primary frame, and means for oscillating said table about its axis of rotation so as to move a portion of said table intermittently toward and away from the grinding roll while maintaining said tiltable frame stationary in its adjusted position.

2. In a glass bevelling machine, a primary frame, a grinding roll mounted on said frame and power means for rotating said roll, a tiltable frame pivoted to the primary frame, a glass platesupporting table on the tiltable frame, means for moving said table toward and from the grinding roll, said tiltable frame having a center of gravity offset from its pivoting axis, a member pivotally mounted on said primary frame, an abutment element adjustably connected to said member and pivotably movable with said member into and out of the path of pivotal movement of the tiltable frame, said abutment element being adapted to engage the tiltable frame so as to prevent the action of gravity from causing said tiltable frame to pivot, spring means engaging said member for pivoting the latter and thereby moving said abutment element into the path of pivotal movement of the tiltable frame, and manually operable means for pivoting said member against the action of said spring means and thereby moving said abutment element out of the path of pivotal movement of the tiltable frame.

3. A glass bevelling machine comprising a primary frame, a longitudinal grinding roll rotatably mounted on the primary frame for rotary movement about a horizontal axis, a tiltable frame pivoted on said primary frame for pivotal movement about a horizontal axis parallel to said grinding roll axis of rotation, a glass plate-supporting table rotatably mounted on said primary frame for pivotable movement about a horizontal axis parallel to the axes of rotation of said grinding roll and said tiltable frame, said tiltable frame having a center of gravity offset from its pivoting axis, a stop member movably mounted on said primary frame for movement into and out of the path of pivotal movement of the tiltable frame and adapted to engage the latter so as to prevent it from continuing to tilt toward the grinding roll, said stop member being adjustable so as to vary the angular inclination of the tiltable frame at which the latter will engage said stop member, and manually operable means for moving said stop member out of the path of pivotal movement of the tiltable frame.

4. In a glass bevelling machine, a primary frame, a grinding roll mounted on said frame and power means for rotating said roll, a tiltable frame pivoted to the primary frame, a glass platesupporting table on the tiltable frame, means for moving said table toward and from the grinding roll, means for movably mounting said table on said tiltable frame for movement with respect to the frame in a direction toward and away from the grinding roll, said tiltable frame having a center of gravity offset from its pivoting axis, a member pivotally mounted on said primary frame, an abutment element adjustably connected to said member and pivotably movable with said member into and out of the path of pivotal movement of the tiltable frame, said abutment element being adapted to engage the tiltable frame so as to prevent the action of gravity from causing said tiltable frame to pivot, spring means engaging said member for pivoting the latter and thereby moving said abutment element into the path of pivotal movement of the tiltable frame, and manually operable means for pivoting said member against the action of said spring means and thereby moving said abutment .element out of the path of pivotal movement of the tiltable frame.

ADOLPH MARCHAND.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 155,734 Klaber Oct. 6, 1874 351,219 Smith et a1. Oct. 19, 1886 394,980 Heroy et a1. Dec. 25, 1888 446,196 Wiederer Feb. 10, 1891 474,119 Friedel May 3, 1892 892,226 Corcoran June 30, 1908 1,026,321 LaHodny May 14, 1912 1,310,263 Vander Meulen July 15, 1919 1,503,687 Hunt Aug. 5, 1924 1,620,021 Hitchcock Mar. 8, 1927 1,925,751 Dilfenderffer Sept. 5, 1933 1,949,708 Collins Mar. 6, 1934 FOREIGN PATENTS Number Country Date 456,152 Great Britain Nov. 4, 1936

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