US1814367A - Long bar grinder - Google Patents

Description

July 14, 1931. J. E. CASTER 1,814,367

LONG BAR GRINDER Filed y 1929 3 Sheets-Sheet l gn'uznto'c jwffvrze J. E. CASTER LONG BAR GRINDER July 14, 1931.

3 Sheets--Sheet 2 Filed May 20, 1929 July 14, 1931. q, E, CASTER 1,814,367

LONG BAR GRINDER Filed May 20, 19 5 Sheets-Sheet 3 filly/72mm? 1);!!! IIIIIIIIIIIIIIIIIIII/III VIII! glwwzmtom dam we Patented July 14, 1931 UNITED STATES PATENT" OFFICE JOHN E. CASTER, OF CINCINNATI, OHIO, ASSIGNOR TO CINCINNATI GRINDERS IN- CORPORATED, OF CINCINNATI, OHIO, ,A CORPORATION OF OHIO Lone BAR GRINDER Application filed May 20,

This invention relates to improvements in grinding machinery and more especially that type of machinery commercially known as centerless grinders.

One of the principal objects of the present invention is the provision of a grinding machine of the centerless type particularly adapted for use in the grinding of long bars,-

tubes and similar articles with extreme accuracy.

A further object of the invention is the pro-- vision of an improved work supporting mechanism capable of application to commercial centerless grinders which will facilitate the accurate positioning and supporting. of an elongated work piece during its introduction to, passage through and removal from the grinding throat whereby extreme accuracy of product will be insured.

A further object of the invention is the provision of mechanism facilitating the accurate relative adjustment of the several work supporting ortions on the device to insure proper axia alignment of the projectin terminal portions of the work with the grmding throat and thus prevent impairment ofaccuracy of'the final product due to radial displacement of the work in any direction during the grinding.

Other objects and advantages of the invention should be readily apparent by reference to the followinglspecification considered in conjunction wit the accompan ing. drawings and it will be understoo that any modifications in the s ecific structural details hereinafter disclose ,may be made within the scope of the appended claims without departing from or exceeding the spirit of the invention.

Figure 1 is a perspective view of the machine embodying the invention.

Figure 2 is a view of the parts at the grinding throat with regulating wheel unit removed and portions broken away.

Figure 3 is a section as on line 33 of Figure 1.

Figure 1 is a vertical section illustrating the work rest clamp mechanism as on the line 4--4 of Figure 2.

Figure 5 is a section as on line 5-5 of Fig- 1929. Serial No. 364,442.

ure 2 illustrating one of the inner work sup porting members, and

Figure 6 is a horizontal section on the line 6-6 of Figure 2 illustrating the adjusting slide 12 which in turn is provided with ways 13 for the regulating wheel unit 14.

Disposed at the opposite end of the bed 10 is the head 15 by which is rotatably supported the grinding Wheel 16. This latter in accordance with standard practice is driven at a high or inding rate of speed with its operative surface moving downward or in a clockwise direction as indicated by the arrow in Figure 4 for proper removal of stock from the work piece.

Located on the grinding wheel unit and in opposition to the grinding wheel is the control or regulating wheel 17 also rotating in a clock-wise directioncto cause its inner operative surface to move upward, This wheel is driven at a slow rate of speed having a wearing friction contact with the work piece for determining the rate of rotation thereof.

In addition, this wheel is preferably axially tilted to create a feed component producing a traverse or feeding movement of the work through the grinding throat provided 7 between grinding and regulating wheels. The slide 12 forms a support for the work rest bracket unit 18 having the terminal socketed ortions 19 to receive the support bars or t-u es 20. As the construction at the front and rear of the machine is the same a description of either will suffice for a proper understanding of both.

Socket 19 is preferably kerfed or split as at 21 and rovided with webs 22 drawn together as by 0 amp bolt 23 to secure member 20 in position. Additionally, to prevent rotative or twisting movement of member 20, use may be made of suitable locking means such asthe work piece 27 within the grinding throat.

Plate 25 has sockets as at 28 to receive balls 29 abutted by the work rest blade adjusting plungers 30 sliding in guides 31 of member 18 and having bevelled lower ends ridin on cam faces 32 of the adjusting slide 33. is slide is urged in one direction by compression spring 34 and is adjustable in the opposite directlon by screw 35. This adjustment under the influence of the screw forces plungers 30 and thus the work rest blade 26upward to vary the height of the an le'top of the blade and thus the position of t e axis of the work piece riding thereon with respect to the axes of the grinding and regulating wheels.

To facilitate securing of the work restblade in desired vertically adjusted position use is made of the clam arms 36 intermediately pivoted as at 37 an coupled by crossbar 38 which forms a power equalizer for distribution of the clamping pressure. The clam in itself is effected through block 39 shiftab e by cam plunger 40 and pressure screw 41 as it will be readily understood by reference to Figure 6.

Th1s particular mechanism is capable of employment when the grinder is to be used for ordinary short work pieces and in the absence of the outer supporting members hereinafter described, though being particularly advantageous when it is necessary to line up both the work rest blade and such outer supportino members in definite relationshi one to the other.

The racket 18 is additionally provided with a slotted guide portion at 42 for support 43 bearing trunnion 44 for the work supporting roller 45 which is adapted to be so positioned as to contact with the work piece 27 in the plane of contact of the angle top of the work rest blade with the work piece.

To facilitate adjustment of roller 45 to this exact position, use is made of the adjusting screw 46 abutting at its lower end the bracket 18 and secured in adjusted position as by lock nut 47.

Tightening of bolts 48 firmly secures member 43 in its proper position of vertical adjustment.

In the production of work pieces by the centerless method it is customary to sup art the work piece on a suitable member. suc as the angle top work rest blade here shown in connection with-a regulating wheel member backing up the work and ur 'ng same in the direction of the grinding w eel. The angle top work rest functions to produce a slight rising or upward movement of the work piece I in the grinding throat when minute irregularities or the like on the work engage the regulating wheel thus minimizin the depth I of opposite cut taken by the grin ing wheel.

The work rest and regulating wheel together therefore, jointly form the determinators of position of the work at all times with respect to the grinding wheel and the position of path and of the work as determined thereby is of primecimportance. 1

In the structure the roller 45 exteriorly supporting the work resents its surface in substantial correspon ence with that ofthe surface of the work rest blade by its free rotation releasing the blade of the ressure of weight of the outer portion of t e work piece and preferably being at a. slight angle to complement the feeding action of the regulating wheel. For proper retention of the work in engagement with roller 45 in correspondence with the position of engagement with the ortion of. the work being operated upon with the work rest, use ismade of a second supporting roll 49 rotatably mounted on bracket 50 adjustably secured to bell crank arm 51 as by bolt 52. This bell crank arm is pivoted at 53 to a support 54 on the bracket 18 and is adjustably maintained in position by elevating screw 55 and clamp screw 56 as indicatedin Figure 5.

This roll is also disposed with its axis at an angle to both rotatable support'and produce feeding movement of the work as the latter is rotated and is adjusted to contact with a point on the work in correspondence with the point in engagement of the regulating wheel surface therewith.

In the production of work of considerable length the individual outboard supports just described are insuflicient to fully position and.

support the outer portions of the work and prevent whipping thereof.

The additional outer support members comprise a series of similar units mounted on the members 20. These units as illustrated in detail in Figures 1 and 3'comprise a spht collar member 55 adapted to be clampe to member 20 as by bolt 56. This collar has an upstanding arm 57 with an ad'ustable section 58 bearin a roller 59 designed to be aligned with t e work rest blade androller 45 as respects its contact point with the work piece 27. Such adjustment is facilitated by screw 60 and clamp bolts 61 retainin the roller bearing section in its adjusted posltion.

Collar 55 is preferably secured against rotation on member 20 by lag screw 62 so that am 57 will at all times extend in a parallel vertical plane with that of the work rest blade.

Disposed immediately adjacent each collar unit 55 is a second s ht clamp 63 securable as by bolt 64 and having a substantially radi- 63. Upon loosening of clamp collar 63 same may be rotated aboutmember to an outward position limited and determined by engagement of screw 70 with thefixed nonrotatable collar and in this manner an extremely small and accurate positioning of the arm 64 of each unit and thus of the supportingmroller 67 carried by the arm is attained.

the operation of the aforesaid mechanism the bracket unit 18 with its several associated parts is mounted and suitably secured on the main slide 12 of the machine and the several parts so thatthe work rest blade and the series of outer work supporting units will equally support the work piece against axial deflection due for example, to weight of the overhanging portion thereof. At the same time the regulating wheel unit 14 is adjusted to-properly engage the work in opposition to the work rest by movement on ways 13 and the several rolls 49 and 67 adjusted to correspondingly engage the outer portion of the work and prevent its lateral deflection in the direction of the regulating wheel or away from the grinding wheel.

The several parts having been thus adjusted regulatin wheel unit 14 is. locked to slide 12 in definite-relation to the work rest bracket and parts carried thereby. The slide 12 with all associate parts is then fed toward the grinding wheel as by manipulation of control wheel 73 to insure proper stock removal from the work piece .and the work is axially advanced through the machine by the combined action of the feed component of the regulating wheel and that of the individual work supporting rollers and a uniform rinding from end to end of the work is e ected.

grinder including opposed grinding and regulating wheels, of a work supporting mechanism for presentation of work in the grinding throat between said grinding and regulating wheels including a supporting bracket, a work rest blade carried by the bracket, means for securing the blade in adjusted position as res sets the bracket, outboard supports carrie by the bracket including a series of supporting arms, rollers adjustable on the arms foralignment with the work supporting plane of the work rest blade, additional arms carried by the bracket, work supporting rollers on the arms, and means for adjusting the second series of rollers for engagement with the Work at circumferentially spaced points. from the first series of rollers in correspondence with the circumferential spacing between engagement of the work rest blade and the regulating wheel with the work.

2. A machine of the character described including opposed grinding and regulating wheels forming a work receiving throatthere between, means for varying the width of said throat, work supporting means disposed within the throat and exterior to the throat for corresponding engagement with a work piece to support same against the thrust of the grinding wheel, means for correspondingly ad'usting said several work supporting mem ers to maintain their simultaneous contact with the work piece along a predetermined radial plane thereof, additional supporting members exterior to the throat and means for adjusting the additional supporting members to present the contacting portions thereof in contact with a radial plane of the work passing through a point of engagement of the regulating wheel with the work.

3. The combination with a centerless grinder including opposed grinding and regulating wheels for simultaneous engagement with a work piece, a work rest blade in the throat between the wheels for supporting a work piece injoint engagement with said wheels, outboard supports, a series of work supporting members carried by the outboard supports in underlying relation to the work piece in correspondence to the relation of the work rest blade'thereto, and an additional series of laterally disposed work rest supports in opposition to the first series for engagement with the work piece in correspondence to the engagement of the regulating wheel therewith at the throat.

4. The combination with .a centerless grinder including grinding and regulating wheels forming a work receiving throat there between, of a bracket disposed within the throat, a work rest blade supported by the bracket and projecting in position to en-' gage and support a work piece in the throat, lateral projections carried by the bracket, a series of work supporting members carried by the projections and extending in parallel relation to the work rest blade and a second series of angularly related work supporting members carried by the projections forcooperation with the firfit series.

5. Thecombination witha cen 'erless grinder including grinding and regulating wheels forming a work receiving throat there between, of a bracket disposed within the throat, a work rest blade supported by the brackat and projecting in position to engage and support a work piece inthe throat, lateral projections carried by the bracket, a series of work supporting members carried by the projections and extending in parallel relation to the work rest blade, a second series of angularly related work supporting members carried by the projections for cooperation with the first series, and means for angularly adj usting the members of the second series with respect to the members of the 1st series to vary the engagement of the second series with an interposed work piece.

6. The combination with a centerless grinder including opposed grinding and regulating wheels, an intermediate work rest, lateral projections carried by the grinder, work supports mounted in pairs on the pro-'- j ections, work 'supporting rolls carriedby the members of each pair, means for radially adjusting the series with respect to the projectioiis, and additional means for varying the separation of the rolls of an individual pair.

7. A centerless grinding machine including :5 bed or support, a grinding wheel mounted thereon, a slide mounted on the bed and movable in a direction toward and from'the grinding wheel, a regulating wheel unit and a bracket carried by the bed for relative movement as respects each other and for joint movement toward and from the grinding wheel, a work rest blade centrally mounted on the bracket, cylindrical supports laterally projecting from the bracket, work supporting units mounted in pairs on the supports, means for securing one member of each pair against rotation on the support, and additional means for locking the other member, of 'the pair in circumferentially adjusted position on the support.

8. A centerless grinding machine including a bed or support, a grinding wheel mounted thereon, a slide mounted on the. bed and movable in a direction toward and :Eroni the grinding wheel, a regulating wheel unit and a bracket'carried by the bed for relative movement as respects each other and for joint movement toward and from the grinding wheel, a work rest blade centrally mounted on the bracket, cylindrical supports laterally projecting from the bracket, work-supportmeans 'for locking the other member of the ing units mounted in pairs on the supports,-

means for securing one member of each pair against rotation on the support, additional pairin circumferentially adjusted position on ,the support,-and cooperating means on the members of each pair for determining theirre'lative angular adjustment.

9. A centerless grinding machine including a bed or support, a grinding wheel mounted thereon, a slide mounted'on the bed and movable in a direction toward and from the grinding wheel, a regulating wheel unit and a bracket carried by the bed for relative movement as respects each other and for joint movement toward-and from the grinding wheel, a work rest blade centrally mounted on the bracket, cylindrical supports laterally I projecting from the bracket, work supporting units. mounted in pairs on the su ports, means for securing one member of eaghpair against rotation on the support, additional means for locking the other member of the pair in circumferentially adjusted position on the support, said members including extensible arms, fwork supporting rollers carried by the arms and means for securing the rollers in desired radially adjusted position as respects the cylindrical support therefor.

contact rollers carried by the arms in alignment with the work rest blade and point of contact of the regulating wheel with the work whereby the work on one side of the grinding throat is supported parallel with the throat for movement therealong into the throat and whereby the work on the other side of the grinding throat is supported parallel with the throat for movement therealong after it passes through the said throat.

a 11. In a centerlessgrinder the combination of a air of opposed grindin and regu-, lating wheels forming a grin ing throat therebetween, a work rest blade subtending the grinding throat for su portin work in engagement with the grin ing an regulating wheels and a work supporting trough exterior of the grinding throat comprising a supporting bar, a plurality of work supporting units carried by the bar in spaced relation, each work supportin unit comprising a pair of arms one 0 which has a split clamping collar surrounding the a bar and a lu extending therefrom, the other arm having a split clamping collar and an ear extending therefrom overlying the lug, adjusting means extending through the ear and contacting the lug for adjusting the arms relative t0one another about the supporting bar, means contracting the split collars to secure the arms to the bars intheir adjusted'positions, and work contacting rollers carried by the arms at the upper end thereof.

12. In a centerless grinder the combination of a pair of opposed grinding and regulatin wheels forming a grindin throat! there tween, a work rest blade su tendingthe grindingthroat for su porting work in f tending therefrom, the other arm having a split clamping collar and an earextending therefrom overlying the lug, adjusting means extending through the ear and contacting the lug for adjusting the arms relative'ito one I another about the supporting bar, means contractin-g the split collars to secure the arms to the bars in their adjusted positions, work contacting rollers carried by the arms at the upper end thereof, and means for adjusting the rollers relative to the supporting arms.

In testimony whereof I afiix my signature.

JOHN E. CASTER.

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