US2612733A - Grinding machine - Google Patents

Description

J. H. TWOMBLY GRINDING MACHINE Oct. 7, 1952 5 Sheets-Sheet 1 Filed March 23, 1951 INVENTOR.

By 144127; aw m Oct. 7, 1952 TWOMBLY 2,612,733

GRINDING MACHINE Filed March 25, 1951 3 Sheets-Sheet 2 INVENTOR BY aww 1952 J. H. TWOMBLY 2,612,733

GRINDING MACHINE Filed March 23, 1951 5 Sheets-Sheet 5 IN V EN TOR. BY wflfmfify QM}: gggwwm wires or rods.

the type described, of

' advanced by the threaded rolls.

illustratedin Figures 1 and 2;

Patented Oct. 7, 1952 UNITED STATES PATENT 01: 1.;

- GRINDING MACHINE John Howard 'rwombi niu, Njir'; Florence D. Twombly executrix of said John Howard Twombly, deceased Application March 23, 1951, Ser'ia1 No. 217,269 4 Claims. (CL 51' 79) This invention relates-to grinding machines and more particularly to machines for performing' the operation of reducing the diameter of Such machines are used in the production of needles and the like, and also for necking or reducing the diameter through an intermediate portion of the length of rods or wires, for example tone rods for toy pianos.

A general object of the invention is the provision of a simple, relatively inexpensive, and highly emcient machine for performing a necking operation or a similar grinding operation upon wires or rods of varying diameters.

More specifically, it is an object of the invention toprovide a grinding machine of the type described, comprising a base, a grinding wheel "rotatably supported above said base, a plurality of threaded rollers rotatably supported beneath saidgrinding wheel for successively advancing -a plurality of rods or wires to and beneath the grinding'wheel, and means for rotating the grinding wheel and the threaded rolls. Another in a grinding machine of an adjustable support for the grinding wheel such that the latter may beadjusted vertically toward and away from the object is the provision,

base, and 'may also be tilted about an axis parallel to the base and perpendicular to the grinding wheel axis, so as to insure equal grinding action at either end of thewheel or, alternatively, to adjust the wheel so as to grind points of any desired length'at the ends of the rods or wires.

Another object is the provision, in a machine of the character described, of a backboard or guard member arrangedparallel and. adjacent "tothe threaded rolls for advancing'the rods or wires, the backboard or guard member serving progress along'th'e threaded rolls,until after they have been's'ubjected to the grinding operation.

A further object is the provision, in a machine of the character described, of means supported adjacent the grinding wheel for frictionally engaging the wires and rods as they are successively presented to the grinding wheel and causing them to rotate about their own axes as they are Other and further objects, features and advantageswill be apparent from the description which follows, read in connection with the accompanying drawings in" which Figure 1 is a front elevation'of a machine con- "structed in accordance with the present invention;

Figure 2 is a plan view of the machine illustrated in Figure 1;

Figure 3 is an end elevation of themachme Figure 4 is a vertical section on line 4-4 of Figure 2;

the purpose of preventingthe wires or rods 3 from advancing along their own axes during their Figure Sis-a vertical section'onlinei -i of Figure-2; 1 Figure 6-is-a vertical section -on-1ine= 6-6 of Figure 2;

Figure '7 isa vertical sectionon-Jine 'I- l of Figure 3; s

Figure 8 is a horizontal-section online 8-8 of Figure 1;

Figure 9 is a rear perspective view of the upper portion of the machine;

Figure 10 is an enlarged fragmentary sectional view showing the engagement of therods-=being processed with-one of'the threaded rolls for advancing them, and with the '--frictional member 'for'inducing their rotation about'their own-axes; and

- Figure 11 is an elevational view of atone rod for a toy piano,after passing'through the machine.

In order toiacilit'a'te an'understanding ofthe invention, reference 'is made 'to the embodiment thereof shown in the accompanying drawingsand detailed descriptive languagefisemployed. It will nevertheless be understood that no limitation of the invention is thereby intendeda'nd' that various changes and alterations are'conterfipla'ted such as would ordinarily occur to oneskilled in the art to which the invention relates.

Reierring'particularly tUFigures 1 and 2, a machine constructed according to "the'inve'ntion comprises generally a base "I ll towhich is secured a horizontal support II and a 'vertical'su'pp'ort l2, the latter beingsecured to "the'ba'se ln'by means of bolts I3 extending throughslo'ts l4 in the base lilso that thesu'pp'o'rt 'l2is-adjustable thereon. The horizontal support ll isprovided at its respective ends 'with the twoupstand-;

ing end portions l5 in-whichare journaled a plurality of helically threaded'rolls IS, ll" and 18. As best seen in Figure 4', the saidrbllsarc provided at-one' end with'toothed'pinions i9? 20 and 2|, respectively, meshing 'with intermediate idlers 22 and 23, the pinion- 20 being fast-"upon the shaft 24 of roll llgwhichshaftalso carries a pulley 25. Means areth'us provided ior rotating the several rolls in unison.- Each ofthe rolls is provided with ahelical thread'bf the same' pitch as-the othersj'wh'ereby'a rod or length of wire laid across-the-rollsfat rightangles will be advancedjtranslationallyy tliat is to say without alteration 'of its right anglerela'tion' to i the rolls.

The rotation-of the rolls l6-l8 -iri--theillus trated embodiment I is I clockwise looking'; oni the right-hand end of the machine,"which' will"= tend to'advance the rods26 (Figure 2) to the-rightand *would also tend to advance them rearwardly' of themachine, in the direction of their own:length.

To prevent this'latter movement abackboard or guard 21 is secured along the rearward edge of the support H, the guard Tl" terminating at a point 28 which is short of the right-hand end of the support ll. After the rods have been operated upon by the grinding wheel, and have passed the end of the guard 21, they are permitted to move rearwardly of the machine until they are overbalanced by their own weight and fall oil of the threaded rolls into a suitable receptacle.

The vertical support I2 is provided with a dovetailed recess as at 36 and a vertically adjustable member 3| is slidably mounted within said recess through the medium of bolts 32 extending through slots 33 in the support I2 (Figure 9). Adjustment of the member 3| relative to the support I2 is obtained through the medium of adjusting screws 34, 35 (Figure '7), the screw 34 having threaded engagement with the rearwardly extending horizontal top portion 36 of the member 3| and having a thrust engagement with the top surface of the support l2. The screw 35 is freely rotatable in the top portion 33 of member 3|, and has threaded engagement with the support 12. The'screws 34 and 35 thus effect, respectively, a push-and-pull relationship between the member 3| and the support I2, for vertical adjustment of the member 3|, which may then be firmly secured in the adjusted relationship by tightening of the bolts 32.

A third vertical member 31 is mounted on the vertically adjustable member 3| by means of a bolt 38 threaded into the member 3! and freely rotatable in member 3|, so that member 31 is tiltable in a vertical plane about the axis provided by the bolt 38. Adjustment of the tilting member 3! is secured by means of screws 39 and ill having threaded engagement with the horizontally projecting flange 4| of the member 3| and bearing upon the upper edge of the tilting member 31. The latter may be secured in adjusted relationship by tightening the bolt 38 against collar 42 which in turn bears on member 3! (Figure 6) The tilting member 3'! carries horizontally extending arms 43 at its respective ends, said arms being formed to provide bearings 44 for the shaft 45 of a grinding wheel 46. A driving pulley 41 is secured on one end of the shaft 45. On the outer ends of the respective arms 43, beyond the bearings 44, are secured short extensions 48 for supporting, through bolts 49, a presser foot or friction member 59, the vertical relationship of the respective ends of the latter being adjustable by means of nuts 52 on the bolts 49. The friction member 50 is so adjusted as to engage the upper surfaces of the rods or wires 26 as they are successively presented to the grinding wheel 46 and by reason of the friction between the member 50 and the rods, to cause the latter to rotate about their own axes as they are advanced by the threaded rolls, thus causing the rods to be ground uniformly about their axes.

From the foregoing description it is believed that the operation of the machine will be understood without diificulty.

A succession of rods or wires to be operated upon is placed upon the rolls l6l8 at the lefthand end of the machine and by rotation of the rolls, will be advanced toward the right. As they successively pass beneath the friction member 50 they are engaged by the latter and caused to rotate about their respective axes, meanwhile being engaged by the grinding wheel 46 rotating about its own axis at right angles to the rods. As the rods are advanced past the grinding wheel they are ground uniformly about their axes and,

4 as they are advanced further, past the end 28 of the backboard or guard 21, they are advanced rearwardly of th machine and dropped therefrom. By reason of the described relationships, the grinding wheel is vertically adjustable with the sliding member 3 I, and its axis may be tilted in a vertical plane, as desired, by tilting adjustment of the member 3'! relative to the member 3|.

The machine is adapted to the rapid and emcient performance of the described operations, and has a much greater capacity than other known machines for performing similar operations.

Having thus described the invention, what is claimed as new and desired to be obtained by Letters Patent is:

1. Rod grinding machine comprising a base, a vertical support secured on said base, a grinding wheel rotatably mounted on said support, a plurality of helically threaded parallel rolls rotatably supported below said grinding wheel and adjacent thereto, for advancing a succession of rods, disposed crosswise thereof, to and beneath said grinding wheel, a stationary friction member supported adjacent said wheel and said rolls for engaging rods advanced by said rolls and causing the same to rotate about their axes while passing beneath said wheel, means for rotating said wheel, and means for rotating said rolls.

2. Rod grinding machine comprising a base, a vertical support secured on said base, a grinding wheel rotatably mounted on said support, a plurality of helically threaded parallel rolls rotatably supported below said grinding wheel and adjacent thereto, for advancing a succession of rods, disposed crosswise thereof, to and beneath said grinding wheel, means for rotating said wheel, and means for rotating said rolls, said vertical support comprising a guideway member secured on said base, a vertically adjustable member mounted on said guideway member, and a third member mounted on said vertically adjustable member, said third member including bearings for said grinding wheel.

3. Rod grinding machine as defined in claim 2, said third member being tiltable about an axis lying parallel to said base and at right angles to the axis of said bearings.

4. In a rod grinding machine, in combination, a plurality of helically threaded parallel rolls, a grinding wheel mounted to rotate above said rolls on an axis generally parallel to the axes of said rolls, means to rotate said rolls and said wheel, and means for causing rods advanced by said rolls to rotate about their axes while passing beneath said wheel, said last means comprising a .7 stationary member supported adjacent said wheel in position to engage frictionally said rods.

JOHN HOWARD TWOMBLY.

REFERENCES CITED Middlebrook Oct. 22, 1907 Hunt Mar. 11, 1924 FOREIGN PATENTS Country Date Great Britain Sept. 16, 1908 Number Number

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