US2332890A - Edge grinding machine for strip material - Google Patents

Description

Oct. 26, 1943. P. E. cARRlcK EDGE GRINDING MACHINE FOR STRIP MATERIAL Filed May 19, 1943 5 Sheets-Sheet l y, y/j' Oct. 26, 1943.

P. E. cARRlcK EDGE GRINDING MACHINE FOR STRIP MATERIAL Filed May 19, 1943 5 Sheets-Sheet 2 INVENTOR. Zac! farrz''.

Oct. 26,' 1943. P, E. cARRlcK EDGE GRINDING MACHINE FOR STRIP MATERIAL Filed May 19, 1943 5 Sheets-Sheet 5 IN VEN TOR.

Oct. 26, 1943. P E, CARRlCK l 2,332,890

EDGE GRINDING MACHINE FOR STRIP MATERIAL Filed May 19, 1943 5 Sheets-Sheet 4 INVENTOR.

. 4h. MEQ/Wd Oct. 26, 1943. P. E. cARRlcKl EDGE GRINDING MACHINE FQR' STRIP MATERIAL 5 Sheets-Sheet 5 a Filed may 19, 1945 on the line 6-6 of Figure 1;

Patented Oct. 26, 1943 OFFICE EDGE GRINDING MACHINE ron STRIP MATERIAL Paul E. Carrick, Birmingham, Mich. Application May 19, 1943, Serial No. 487,609 6 claims. (o1. 51-78) Thepresent invention relates to an automatic grinding machine for grinding a radius on strip v material. y

It is the general object of the present invention to provide a machine of rugged and simple construction for automatically feeding strip ma` terial past one or more grinding wheels `andescillating the work relative to `the wheel during the grinding operation in order to form a radius on the material.

Another object of the invention is to provide a work supporting and feeding means of the type mentioned `which is adapted for use in connection with conventional grinding machines of `the type in which the grinding wheel Spindle is carried at the end of an overhanging arm. d

Other objects ofthe invention will become apparent from the following specification, the drawings relating thereto, and from the claims hereinafter set forth. l

In the drawings, in which like numerals are used to designate like parts in the several views throughout: A

Figure 1 is a side elevation of the machine;

Figure 2 is an end elevation of the machine, including a fragmentary illustration of the independent support `for the grinding wheels;

Figure 3 is a fragmentary vertical section taken on the line 3-3 of Figure 2, with parts broken away to show the interior construction;

Figure 4 is a fragmentary transverse Section i taken on the line 4-4 ofFigure 3;

Figure 5 is a fragmentary plan view of the machine with the grinding wheel and grindingwheel housings removed;

Figure 6 is an enlarged transverse section taken Figure 'I is a perspective view of one form of workpiece upon which the `machine is adapted to operate; and 9 V Figure 8 is an end view showing the condition of the workpiece prior to the grinding operation."

The machine selected for illustration is especially constructed to grind a radius on the forward edge of the type of bar employed in `constructing bullet-proof grilles utilized in armored vehicles to protect radiatorsl etc.

As shown in Figure 7, the bar I0 is an `elongated, relatively flat bar of somewhat tear-drop formation in section `which is provided with a rounded forward edge II at itsthickestsection. This type of bar is normally made by a rolling operation in which two sections are rolled simul y taneously, as indicated by the dotted and full lines in Figure 8, the thicker portions of the two seccult to machine and, consequently, the machine of the present invention is provided to grind olf the flanges or web projections and suitably round the forward edge. It will be appreciated; however, that the machine of the present invention may be adapted to form radius portions on any type of 'stripmaterial 1 Referring toFigures `1 to 6 of the drawings, the machine comprises a frame, which may be of any suitable construction, consisting primarily of four channel-shaped corner posts I5, I6, I'I and I8 connected intermediate their ends by side plates 20 and end plates 2|. The upper ends of legs I5 andIB are connected by across bar 22, while the upper' ends of legs I3' and I 'I are connected by a similar cross bar 23. The space above one `of the side plates 2|] is closed by a hinged panel consisting of a rectangular framework 24 hinged at 25 to the legv I 5 and at 26 to an upright corner post 2'I mounted on cross bar 22. The framework 24 is closed by a panel indicated fragmentarily at 23, the main portion 'of the panel being broken away in Figure 1 to show the interior of the machine. 'Ihe hinged panel 24 is provided at its free edge with a pair of `projecting lugs 3U spaced `apart to receive the shankof an eyebolt 3|, which is pivoted on a pin 32 carried by a pair of lugs 33 fastened to a corner post 34 mounted onthe forward end of cross bar 23 and similar in construction to the corner post 21.

` Also mounted at either side of the machine adjacent the rear thereof is a pair of identical side plates 35, one of which is, shown in Figure 2. The top rear edges of the side plates 35 are connected by a cross bar 36, to which is xed intermediate its ends a pair of uprights 31 connected by a plate 38.

A pin 39, fixed in the upper ends of the uprights 31, pivotally supports a housing 4I! for a pair of grinding wheels 42. The housing 40 carries a forwardly extending coverplate 43 which rests upon the frame 24 at the front of the machine. All ofthe remaining exposed portions of the machine are preferably enclosed by suitable fixed sheet metal panels, which have been omitted from the drawings for the sake of clarity.

The grinding wheels 42 form part of an independent grinding or buillng machine of conventhe other.

tional construction, being mounted upon a spindle 44 carried at the extremity of an arm 45 and being driven by a V-belt 46 engaging a pulley 4l.

Y The arm 45 is bifurcated and hence supports the grinding wheel spindle at each side of the housing 45. The arm, which carries a motor, not shown, for driving the belt, may be mounted in any conventional manner, as upon a vertical post upon which it may be adjustably positioned. `Conventional means are included inthe grinding machine for accurately adjusting the height of the extremity of arm 45', which carries the grinding Wheels.

The grinding wheels are placed Vinthe'positi'ori r shown in the drawings by lifting the pivoted cover 43 and moving the grinding Wheel into position, whereupon the cover may be replaced.

The machine includes a Work.'v supporting carriage, shown best in Figures 3, 4, 5 and 6, of geny erally box-like construction, including a bottomV wall 55, a pair of end walls 5| and 52, and ai continuous sidewallli provided with a'pair of sion-ts 54 in the neighborhood of the `grinding Wheels. The opposite side ofv the carriage is formed by v'e identically constructed, vertically extending.- plates 55, one located between the. wheels andy two located at; the outer sides of the Wheels. l,

The upper ,end of each of the plates Etuisnotched at its corners to receive a pair of blocks 51. The blocks 5l for thel adjacent-corners of tliertivol outer pairs ofiplatesi 55 are formed as one piece, bridging the space between the'outer'pairs of plates. All of the blocks 57| pro-ject inwardly to support the top members of the Worksupporting carriage. Thetcentralmembertf is provided with a-top member secured by capscrews 6l]y to the blocks-5l' at-one end 'and tothe'wall 53 at The outer of. plates 5S, shown at thev right-hand -sidei'oflligure 3;is connected by top member 5! being secured by cap screws-E4 to the' blocks 51 and-"to theI Wall'l.. Thefplates 55 are also connected to,` thel bottom Wall by;

means ofA cap screws 65;' In. consequencefof this arrangement, the plates 55 and the top plates 55 andil'maybe readilyremoved. The carriageV is provided With ve-identically constructed backing 'rollers lll, one beinglocatedopposite each ofthe sideplates 55: The backing rollers, as best shown in Figure 4, are provided With-a cylindrical section li, a' fiange l2 at theY upper end of' e'aohrollerpanda radius I3 connecting theiiange 12v/'ith the cylindrical portionv ll.

The radius 'E3 corresponds. to the radius at the edge of the workpiece mand, consequently; the backing rollers 'lli serve to'looate thevvork striptk thereto'by means of a key 85. Eachv of th'egears 19 Vmeshes with a gear 8l, which is formed' in-k tegrally with a roller 32 journaled bylmeans ofball bearings 33 on a spindle 3d. The spindle lliispivotally mountedV upon a pin 85 carried by a U-shaped bracket 85, which embraces the spindle 84 and is xed'tocne of thel plates 55 by'y means of a `capV screw Sli The lower end of the spindle del is connected by means of a pin 5B to the bifurcated endofa bolt 8S, whichslidably projects through Van opening in plate 55 and carries a spring-"gil, the` tension of Which may be adjusted byla pair of nuts 9 l. Y

As a result ofl this arrangement, it Will be apla Vcommon top member 5|' to the sidewallk 55, the

Spindle'l carriesy a gear '|39 secured* parent that the tension of spring @il tends to swing thespindle 84 clockwise about the pin 85 and force the roller X32 against the Work strip lil, thus holding it in proper relation with respect to the back-up roller l5.

The upper end of the spindle l84 is received Within an elongated slot 92 formed in the top plate 6| or 59, as the case may be, it being understood that there is one roller 82 yfor each of the back-up rollers Til and'that all of the rollers 82 are mounted in the same manner. Each pair of gears 79 and 8| is housed by a housing 94, and

`oil seals 95 and 96 are mounted in the openings irrth'e'liousing Q4' and surround the hubs of the vgears T9 and 8i, respectively. The openings in plates 59 and 6|- through which the upper ends ofthe spindle 'i6 project are closed by means of removable plates 5.8, while the openings 92 are closed b y removable plates 59.

A'sheet metal housing |52 is located adjacent each of the. outer. pairs. of vertical plates 55 and contains the mounting. mechanism for a pair of rollers |03 adapted to engage the bottomedge of. the Workstrip. in the manner best shownvin Figure 4, the rollers lil?, being provided with grooves |54 forreceiving the bottom edge of the strip.. Between the. central plate 55 and each ofA the,` two outer pairs Vofpl'atesisa pair of hous ings |05, each of whichr houses the mounting mechanism for a single roller iii'identical in construction and mode of operation to the rollers |53. There are thus provided vek rollers like the rollers |53 engaging the` bottomfedge ofthe v As best. shown in the brokenv awayportion of Figure 3 andfin Figures 4 and 5, the rollers |53 and v |56V are journaled on shouldered` bolts |51:

carried at the extremities of levers |58', Veach ofY which is pivotally mounted on a pin I'l carried at the upper end `of a standard Illi fixed to the lower Wall 5B of the carriage. The opposite extremities of the levers Hi8 are-pvoted byapins to the heads of bolts H2,v which slid'ably project through openings in thefbottom Wall 55. A spring ||3.surrounds each bolt H2 and its tensionl may be adjusted by means of nuts VH11 in order to adjust the force with which the rollers |53 are urged against the Work strip. A stop H5, itted in a suitable opening inthe bottom Wall 5|), engages the leverv `|58 and limitsY movement of the lever in the vdirection in whichit advances the roller toward the Work. Y l

A pair of circular discs |25 is xed, respectively, to the end Walls 5| and 52 of the carriage. Each disc is provided with a peripheral groove or roller track |2|, which is engagedV by seven circumferentiallyspaced rollers I2?. that are journaled.

by means of ball bearings on trunnions |23,.which project through suitable openings in the end plates .andV are secured in-V position by means of nuts |25. Asia result of this arrangement,

the carriage as a Whole may oscillate about anv axis passing through the center of vthe discs |20.

The discs are so arranged that this axis coincides withl the axis of the radius on the Work strip to be ground.

As best shown in Figure 6, end plate 52 has/aY bearing |31 secured to the upperv edge of the end plate 5|. The outer end of the shaft |30 carries ai sprocket |32, which4 may be driven fromz `bolts H2, but also a shaft |36 mounted at spaced points along its length in bearing`s-il3`1 secured by means of cap 'screws |38 to a downwardly projecting portion of the side wall 53. The bearings |31 support the shaft |36 in the plane of the axes of the back-up rollers |10. The lower spindle on each back-up rollercarries a bevel gear |40 which meshes with a` bevel gear |4| mounted on the shaft |36, there being one bevel gear |'4| for each of the back-up rollers.

As best shown in Figure 3, the right-hand extremity of the shaft |36 carries a ratchet wheel |43 and a double armed link |44, one arm of which lies on each side of the ratchet wheel |43 and is journaled on the shaft |36. A pawl |45 is pivotally carried on a pin |46 mounted on the lever |44 between the arms of the lever |44; and a leaf spring |41, fixed to the lever by means of screws, normally urges the pawl into engagement with the ratchet wheel. The lower end of the lever |44 carries a pin |48 onwhich is journaled a roller |49.

As best shown in Figure 2, when the carriage is oscillated in a counterclockwise direction to its extreme position, the shaft |36 swings from its lower position, in which itV supports the lever |44 in the position shown` in solid lines, to the position indicated in dotted lines by the numeral |36. During this movement the roller |49 on the end of the lever |44 hits a ratchet operating member 50, thereby swinging the arm |44 clockwise about the shaft |36 and, consequently, rotating the ratchet wheel and the shaft |36 through a small portion of one revolution. This rotation of the shaft |35 is transmitted through gears |40 and |4| to the back-up rollers 19 and by the gears 19 and 8| to the rollers 82, thereby rotating all of the rollers 10 and 82 in a direction to feed the strip lengthwise by an amount slightly less than the width of the grinding wheels 42.

It will be observed that this work feeding movement occurs when the carriage is at one of its extreme positions of oscillation and that, moreover, it occurs during the time in which the grinding wheels 42 are out of contact with that portion of the work strip indicated by the bracket |52 in Figure 4 which requires grinding.

The ratchet operating member is pivoted on a pin |54 fixed in an arm |55 carried at the upper end of a lever |55, which is pivoted by means of a shouidered cap screw |51 to a block |58 fixed to the corner post l1. An elongated opening |59 formed in the member |59 receives a pin |59 carried by the member |55 and thus limits the oscillation of the member |50 about its pivot pin |54. A spring |5| is mounted be-` tween the lower end of the member |50 and the member |56 and normally tends to separate the two, thereby forcing the upper end of the member |50 to the left, as viewed in Figure 2, The pivotal mounting of the member |50, together with the spring l'l, cushions the shock incident t`o contact between the member |50 and the roller |49.'

in order to adjust the feed of the work, the position of the member |50 may be shifted by swinging vertical arm |56 about its pivot |51.

This is accomplished by means of a threaded bar |62, which passes through suitable openings in the side wallmember 20, and a bracket |63 mounted on the side wall. A pair of nuts |64 threaded on the member |62 at opposite sides` of the bracket |63 may be rotated to adjustl the position of thethreaded bar |62 and lock itin adjusted position. Theinner end of the threaded bar |62 carries a member |65 provided with a slot |66, which receives a pin |61 carried bythei member |55. Consequently, `adjustment of the position of the threaded bar 62 adjusts the position of the member |55 and arm |56 about the pivot |51 and thus controls the distance which the work is fed on each oscillation.

l As best shown in Figure 2, the side plates 35 are provided with circular openings of approximately the diameter of the discs |2ii, so that the ends ofthe carriagev are exposed at either end of the machine. The discs |20 are also provided with openings Athrough which the work strip may be inserted, anda trough formed of three plate members |10, |1| and |12 is fixed by means of a plate |13 to each vdisc |20 in order to guide the work strips entering andleaving the machine. A pair of horizontal plates` |14 is secured to the trcughmemb'er'at Veither' side thereof to give it transverse rigidity.v i i The operation` of the machine will be obvious from the previous description.l Itis only necessaryto positionthe grinding wheels accurately with respect -to the carriage and start one of the strips by hand by placing it in the trough at the entering side-ofthe machine and forwardj ing it into a position where it will be engaged by the rollers 1li and 82. From-then on the machine@A automatically oscillates the Work'back and forth about `the axis of` the carriage and feeds the work step by step past the grinding wheels. The work feeding movement occurs during an idle portion ofthe oscillating-stroke of theparriage and, consequently, will not interfere with the grinding operation.

Any desired number of wheels maybe employed. It will be observed, however, that in the `machine illustrated, employing two wheels, each portion of the surface to be ground is subject, to four grinding operations due to the fact that the work is oscillated in one direction and then returned in contact with the wheel between each Work feeding step and the fact that the two wheels are operating simultaneously. The angle of oscillation may be readily adjusted to accommodate a radius of any desired arc by varying thelength of the crank arm |29, and the i machine illustrated is adapted for use in connection with an independent grinding machine of conventional construction, the machine may incorporate its own grinding wheel spindle support and be a self-contained complete machine Without departing from the spirit of the invention.

What is claimed is:

1. A mechanism for supporting and feeding strip material to a grinding wheel for grinding a radius on the strip material comprising a stationary frame, Aa Work supporting carriage pivotall-y mounted 'on the frame yand adapted to support strip material with the axis of the radius to be ground onthe material coinciding Withftheaxi's of pivotal mounting of the carriage, means to axis of pivotal mounting vof tine carriage, means to o's'cillate the carriage, and means on the carvri'age for feeding the Work endwise step by step upon the completion of 'each cycle of oscillation of said carriage', f

2l. A mechanism 'for supporting `and feeding strip material to a grinding Wheel for grinding a radius on the strip material comprising a fstationary frame, a Work supporting 'carriage pivotally mounted 'on the frame and 'adapted' to sup'- port strip material with the axisuof the radius to be ground on the'material cci in`cidingk with `the axis vof pivotal mounting of tnec'arriage, means to oscillate the carriage about an arc in excess of the 'arc of the radius to be ground, and means to feed thework 'endwise R'step bystep upon the completicn of each cycleo-f oscillation of said carriage .when the grinding Wheel is out of contact withv the surface of the Work requiring grinding. .Hej-A. mechanism for supporting and feeding n stripmaterial to a grinding Wheel for grinding a. i radius' on'the strip material comprising 'a frame,

a Work supporting carriage pivotally mounted on the frame on an axis parallel to the grinding Wheel axis, a plurality of rollers jou'rnaled on said carrivage and adapted to engage' and locate a work strip for movement in a di-rectionparallel tothe grinding Wheel yaxiswith the center, of the radius to `beground onthe lworkpiece located-on the axis of -tnepivotal mounting of the carri-age, means to oscillatethe carriage, and means to rotate said rollers and thus feed the Work past ther grinding Wheel.

-5. A mechanism for supporting fand feeding strip material to agrinding Wheel for grinding a radius on thestrip material comprising a frame, a A.Work supporting carriage pivotally mounted on the frame on an axis parallel to the grinding Wheel axis, aplurality of rollers journaled on said carr-iage and adapted to engage and locate a Work f' strip for movement in a direction parallel to the grinding Wheel axis with `the center of the radius to loe-ground -on the workpiece located on the axis of the pivotal mounting of the carriage, means to oscillate the carriage, and means to rotate said rollers and thus feed the Work past the grinding wheel step by step upon the completion of each cycle of `oscillation of said carriage.

6. A mechanism for supporting and feeding str-ip material to a grinding wheel for grinding a radius `on the strip material comprising a frame, a Work supporting carriage pivotally mounted on the frame on an axis parallel to the grinding wheel axis, a plurality of rollers journaled on said carriage and adapted to engagerand locate a Work strip Vfor movement in a direction parallel to the grinding wheel axis with the center of the radius to be ground on the workpiece located lon the axis o-f the pivotal mounting of the carriage, means to osci-llate the carriage about an arc in excess oi' the arc of the radius to be ground, and means to rotate said rollers and thus feed the Work` past tine grinding Wheel -step yby step upon the completion of each cycle `of oscillation of -said carriage when the grinding Wheel is out of contact with the surface of the Work requiring grinding.

- PAUL E. CARRICK.

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