US1665040A - Machine for rounding the edges of glass sheets - Google Patents

Description

April 3, 192 1,665,040

W. OWEN MACHINE FOR ROUNDING THE EDGES OF GLASS SHEETS Filed April 8 1926 3 Sheets-Sheet l April 3, 1928.

1,665,040 w. OWEN MACHINE FOR HOUNDING THE EDGES OF GLASS SHEETS Filed April 8 1926 s Sheets-Sheet 2 zr 7 J k 62 1 v INVENTOR April 3, 1928.

1,665,040 W. OWEN MACHINE FOR EOUNDING THE EDGES OF GLASS SHEETS Filed April 8 1926 3 Sheets-Sheet 3 Jf f}. 3

1 14 I. i I W i INVENTOR Patented Apr. 3, 1928.

UNITED STATES PATENT OFFICE.

WILLIAM OWEN, F PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENNSYLVANIA.

MACHINE FOR RDU'NDIHG THE EDGIES OF GLASS SHEETS.

Application filed April 8, 1926. Serial No. 100,852.

The invention relates to machines for rounding the edges of sheets, such as the glass sheets used in automobile wind shields and bodies. ()ne of the most successful n achines for doing this work comprises a series of wheels of abrading material placed in alignment, one after the other, and each 3 having a plurality of circumferential grooves. A series of plates 01' sheets correspending in number to the number of grooves in the wheels is carried over the wheels and round the edges of the plates on a curve corresponding to the curve of the grooves. @ne of the objections to this machine is the rapid wear of the wheels, which quiclrl alters the shape of the grooves so that t e wheels must be resurfaced to bring the grooves back to their'original contour.

This rapid wear is largely due to the unequal worlr imposed on the various portions of the surface of the grooves. Each sheet has two sharp corner edges, which must be cut away before the main part of the edge of the sheet is brought into contact with the surface of the groove. The surface of the groove is, therefore, rapidly worn away by the glass along the lines where the sharp corner edges of the sheets engage, so that the groove loses its shape, and becomes more and more unsuited to give the glass edges their proper shape. The resent invention is designed to overcome this dificulty, by the addition of means which rough 0d the sharp corners edges of the sheet before such edges reach the rounded circumferential grooves heretofore r'eferred to, so that such grooves are relieved of this work and caused to wear more uniformly, thus increasing the life of the grooves many times over. A further.

object of the invention is to provide a roughing grinder for the edges which is applicable as a unit to the multiple groove wheel type of edge machine, and to provide a roughing means which is self-dressing, so that such means requires attention only when comletely worn out. One embodiment of the invention is illustrated in the accompanyin drawings, wherein:

%igure 1 is a side elevation of a part of the machine. Fig. 2 is a partial plan view of the machine. Fig. 3 is a section on an enlarged scale on the line IIIIII of Fig. 1. And Fig. 4 is a section on the-line IVIV of Fig. 1.

Referring to the -drawings, the framework of the machine is made up of a horizontal plate or table 1, a series of vertical angles 2, 2, 2, etc, and longitudinally extending bracing members 3. Carried upon this framework is a bridge comprising vertical members 4, 4, 4, etc., (Figs. 1 and 4) braced by diagonal members 5 and carrying longitudinall extending guides 6 and 7, the latter guide being hollow and carrying the upper flight of the drag chain 8. This drag chain passes around a pair of sprockets 9, 9 at the ends of the framework, only one of such sprockets being shown. This chain is driven in any suitable manner, and its lower flight is supported upon the top of the table 1, as indicated in Fig. 3.

The machine is designed to round the edges of six sheets of glass 10, 10., 10, etc, as indicated in Fig. 3, although this number may be Varied to meet requirements. The sheets are placed upon the machine at the right hand end (Fig. 1) and dragged along over the abrading wheels by the lower flight of the chain 8, such chain being provided at intervals with the transverse members 11 (Fig. 3). These members have downwardly projectmg lugs 12 secured to the chain 8 and also a pair of fingers 13, 13 fitting over a guide flange 14 on the table 1. The other ends of these members rest upon a guide 15 at the other side of the table, and intermediate the ends of the member are the fingers 16, 16, 16, etc., fitting between the sheets of glass and supporting them. These lingers project backwardly, as well as forwardly, as indicated in Fig. 1, so as to space and support the sheets of glass to the rear of the member as well as those in front of it. A second set of spacing and supporting members 17, 17, 17, etc., is carried by the guide member 8, such members bein dably sup ported upon such guide an having forwardly and rearwardly projecting fingers similar to those on the members 11. These members 17 serve to support the upper portions of the sheet, thus maintaining them in vertical position and at a proper distance Eli apart and being moved along ,by the glass 7 sheets themselves.

The roughing away of the edges of the sheets is accomplished by means of the plurality of pairs of cup grindin wheels 18, 19, 18, 19, etc., six pairs of 1: ese wheel:

incense In operation, the plates are mounted upon the rollers 20, 20, insets of siX with the members 11 and 17 in engagement therewith as indicated in Fig. 1 the fingers of such 5 members lying between the plates and holding them in proper spaced relation. The driving of the chain 8 in the direction indicated by the arrows causes the members 11 to carry the series of plates over the sets oat grinding Wheels 18 and l9 and each sheet has its lower edge acted upon by one of the pairs oi? Wheels so that when the sheets have been carried past this grinding unit hy the drag chain, their corner edges are iicveled away, and only a slight amount oi? :turther grinding action is supplied by the series of wheels 51 whose grooved grinding surfaces give the slice the desired contour, after which they over a suitable polishing Wheel ozt similar contour. The work iinposed upon the grinding wheels 51 by this operation is relatively slight, so that these wheels may he used :tor a long period oat time "without any requirement for redressing the grooves. The sets of grinding wheels 18 and hear the brunt of the grinding action hut hy reason oi the fact tl'iat their grinding edges are sell dressingfthe wheels have a relativ ly long: life, the only attention which thisunit requires being the vertical adjustment the Wheels from time to time, heretoitore descrihed in oi'derto compensate wear of the wheels. M Y at l claim nachinc tor rounding the edges of Nets, comprising an ahrading wheel d with a plurality of circumferential grooves, a corresponding plurality of pairs bers of each pair of roughing wheels having; their axes of rotation oppositely inclined ohliquely to the plane of the sheets, so that I the face of one of each pair of roughing wheels engages one of the corners at the edge of the sheet, and the other wheel of the pair engages the other corner at such edge of the sheet.

ll inail-hine for rounding the edges of olnssshoets, comprising an ahrading wheel' s provided with a plurality of circun'iterential grooves a corresponding pluinlity' or pairs oi roughing Wheels, arranged in series in staggered relation, in advance ol: the grooved Wheel, and means tor supporting and carrying a plurality of sheets of glass in parallel relation over the roughing wheels and then over the grooved ahrading wheel, the nieinhers of each pair of roughing wheels having their axes of rotation on opposite siees ot' the line oi travel 0 he sheet and arranged so thatthe cutting rface oft one of each pair of roughing" heels engages one of the c iers at the edge of the sheet and the cutting surface of the other Wheel of the pair engages the other corner at such edge of tee sheet.

in testimony whereof, l have hereunto sunscrioet'i my name this 12th day of March, 1926.

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