US1589043A - Grinding machine - Google Patents

Description

June 15 1926.

G1 BINNS ET AL GRINDING MACHINE Filed Dec.

x mm June 15 1926. 1,589,043.

G. W. BINNS ET AL GRINDING MACHINE Filed Dec. 5. 1924 4 Sheets-Sheet 2 ml wzfim fi Tomey June 15 1926.

- 1,589,043 G. w. Emma 51- GRINDING MACHINE Filed Dec. 5, 1924 4 Sheets-Sheet s 1 June 15 1926.

G. w. BINNS ET. A1.

GRINDING MACHINE 4 Sheets-Sheet 4 Filed Dec.

Patented June 15,-1926.

"UNI ED STATES 1,589,043 PATENT QFFiCE.

GEORGE W. BINNS, OF CINCINNATI, ANT.) WALTER D. ABCHEA, OI NOBWOOD, OHIO,

ASSIGNORS TO THE CINCINNATI MILLING MACHINE COMPANY, OF CINCIINNATI,

OHIO, A conromrron or OHIO.

enrnnme menmn -.Application filed December 5, 1924. Serial No. 754,217.

This invention relates to improvements in grinding machinery and has particular reference to a novel andsimproved form of work holding mechanism for use in the pen formance of a specific type of grinding.

Present improved methods of grinding have made it possible to produce various round members, such as, spring shackle. bolts used in automobiles and the like,'by centerless methods; that is to say, by the work being held between grinding and regulating wheels for free rotation in place of being supported upon definite centers for the cylindrical grinding thereof.

Bolts of thetype in question are frequently a desired ground with a reduced or flattened portion at one side. Under old methods of production where the bolts are subsequently to be held in centers, this flat could be readily placed upon it, while in the rough form, and the work subsequently rotated upon centers to produce the desired cylindrical outline.

With the centerless method of grinding, however, inasmuch as the tendency of such machines is to round. up out of true work, these flats-can not to advantage be placed upon the work pieces prior to their cylindrical grinding, and it has been customary to subsequently place the desired flattened area thereon by holding the work pieces in the hand against a suitable grinding wheel.

It is the purpose of the present invention to greatly increase the rate of production of such work pieces by providing means which shall satisfactorily and readily hold. cylindrical members against accidental rotation, in which the work pieces may be readily and quickly introduced and with equal facility removed after a grinding, and which shall be readily adjustable to accommodate different diameters of work pieces.

One embodiment for accomplishment of the foregoing objects is illustrated in the accompanying drawings, but it is to be understood that any modifications may be made in the s ecitic structural details or combination an arrangement of parts here inafter disclosed within the scope of thesppended claims without departing from or exceeding the spirit of the invention.

Figure 1 represents a perspective view As the present invention is particularly adaptable for use in connection with cyindrical work pieces such as produced by what 1s known as centerless grinders, it has been illustrated in connection with such amachine, although it is to be understood that it is equally adaptable for use with any rotary grinder.

In Figure 1 therefore a centerless mare 5 is an end view illustrating the chine has been shown including a bed portion A having the support B for the regulating wheel spindle and the support D for the grinding wheel E, suitably* rotatably supported and driven. The conductor L lli F serves to supply coolant to the operative face of the wheel E.

Formed on the regulating wheel sp pport B in the form illustrated in a way nor mally supporting thework rest in cylindrical grinding. The present invention has been shown as formed. with a base 10 capable of application to said way F and seeurable as by the bolts Gr ordinarily employed for attachment of the work rest.

The device is therefore capable of substitution without change ofnarts for the work rest, and allows the entire operation ,to be completed on the single grinding wheel in the event that the shop e uipment does not contain other wheels whic could be used to better advantage.

In Figure l the usual-regulating wheel a of the center-less grinder has been removed, but it is to be understood that in those terms in which the regulating wheel is adjustably sup orted, it may be simply backed ofi out oi t e way to rovide suflicient space for the present wor olding device. I

The base portion 10 of the device has ris- Gil ing therefrom the brackets or standards 11, providing a mounting for the pivot spindle 12, on which is rotatably engaged the furcations 13 of the swinging work car- 'riage 14. This carriage has formed inits face a seat 15 for the removable, and reversible jaw 16 retained as by screws 17. In addition the carriage has projecting above this recess, the lugs 18 supporting pivot rod 19 for the swingingjaw or clamping member 20. This member 20 has a rearwardly extending actuating portion 21 and a head 22 recessed as at 23 for the upper jaw member 24. 7

Particular attention is invited to the construction of the opposed faces of the jaw members '16 and 24. It will be noted the jaw member 16 has a short downwardly inclined lip portion 25 and a longer upward and rearwardly inclined portion 26 providing the V notch 27 relatively near the forward edge of the jaw. On the other hand, the member 24 has a wider V notch 28 opposed "to the notch 27, but in oli's'et or staggered relation thereto. The advantage of this is apparent as by reference to Figure 5, from which it will be seen that a work piece of quite small diameter will fit into the notch 27 with a portion extending laterally beyond the face of jaw 16 for engagement with the wheel E, while the upper jaw member 24 will engage the upper face of the work piece to hold 1t down into the notch 27. Similarly the upper member is adapted for cooperation not only with a very small work piece, but with much larger work pieces when desired, in alldnstances' satisfactorily holding them into the notch of the lower jaw. By this structure it is'pos sible to employ a single upper jaw member in combination with interchangeable or reversible lower jaw members such as indicated, having the apexes 27 of their notches at difierent distances from the front face of the jaw and in this way satisfactorily take care of a wide variety of sizes of work, all of which will be properly and satisfactorily clam ed in place. 1

To operate the device, the carriage 14 is provided with a handle 29,. which may be employed to swing the carriage about its pivotal support 12. tiarried by member 12 1s a camfl30 co-operating with roller 31 at the lower'end of plunger 32 sliding in sleeve portion 33 of the carriage, This plunger is of sectional form, comprising the lower art 32 and a telescopic sleeve portion 34 aving a pin 35 moviible in slot 36 of the ortion 32 and a flanged portion or head 37 imiting downward movement -of the plunger in sleeve 33. i A. compression spring 38 is contained within thesleeve 34 of the plunger bearing at one end against the head thereof, and at the other against the end of section 32, tendlength of the plunger as an entirety; that is to say, the distance from the upper face of plunger 42 to the lower or cam-engaging portion of roller 31.

It will be noted that since the plunger and associate parts are moved with the carriage, while the cam 30 is a stationary 'member, the roller moving upward on the cam will shift the plunger to swing jaw 20 about its pivot and tightly clamp the work, the amount of clamping ressure being limited by the compression force of spring 38 and said spring in addition serving to compensate for inaccurate adjustment of screw 39 in that it permits of a certain amount of lost motion after the work piece is tightly clamped.

It will be noted that cam 30 has a concentric arcuate portion 44 over which roller 31 moves at the com letion of the clamping operat1on, so that t e work piece is held securely clamped during the latter part of 1ts movement, as it is brought against the grinding stone and fed in for proper depth of out. To limit this inward feeding movement, member 11 is provided with an extens1on-45 engageable by adjustable stop device 46 on the swingin carriage 14.

To normally retain t e jaws in open positlon and thus facilitate insertion or removal of the work pieces, a coil spring 47 may be suitably secured as to pins 43-49 on the carriage and jaw respectively, this arrangement being particularly shown in Figure 3.

While the work ma be positioned and re moved in any desired manner, it has been found preferable toiprovide an automatic e ection mechanism, which shall also serve as an initial positioning device for determining the correct location of the work relative to the lower jaw prior to clamping engagement of the upper jaw member therew th. To this end the carriage is formed with a number of vertical slots or'recesses 50 190 traversed by the rod 51 carrying the L- shaped ejector fingers 52. Additionally, the upper clamp head 20 is formedwith grooves 53 through which the ends of the fingers may move and the ' aw members 16 and 24 are slotted as at 54 or the terminal portions of the ejector fingers. A spring 55 having its ends secured respectively to one of the fingers and to the main carriage normally serves to hold the fingers in the rearwardly' Aim shifted position. In order, however, that justment of stop 57 serves to-vary the posisupports 11 with an extension 59 disposed applied to the work during tion of the ejector fingers so that they control location of the work on the lower jaw and form a retaining device therefor, until the upper jawis brought down in clamping engagement therewith, and also they pre vent any possibility of rearward shifting of the-work pieces by either the clamping effect of the jaw or by'the feeding pressure inding.

The arm 56' incidental y performs a double function in that it not only supports the stop for positioning the ejector fingers, but also actuates the bar 51, and thus the fingers for ejection of the work. This result is attained by providing one of the bracket in the path of arm 56 to contact therewith as the carriage is swung to its rearmost limit of movement,the impact of the arm against extension 59 serving to swing the e ector fingers forward and force the work out of the jaw on which it rests into the conveyor trough 60 disposed therebeneath.

To cushion the rearward swinging of the carriage and return it forward a suficient amount so that the ejector fingers may be retracted from ejecting to work positioning location, use is made of the cushion plunger 61 slidable in passage 62 of carriage 14. This plunger has at its lower end a head 63 for engagement with the wear block 64: set into base 10, while behind said head and within the passage is compression spring 65. As carriage 14: is swung backward, the depending portion 63 of the plunger will en gage wear block 64 and be forced upward against the pressure of the spring, cushioning the rearward movement of the carriage, and allowing sufficient movement so that the ejector fingers are forced forwardly to the position indicated 'in Figure 4 throwing the work out of the retaining jaw.

When the handle 29 is released by the operator, spring 65 will expand, raising the carriage 'until collar 67 on the plunger con tacts with member 14, when the carria e will be at rest. This lifting effect caused y the spring will be sufficient to allow spring 55 to retract the ejector fingers, bringing stop 57 against pin 58 when they are in position it; support work laid on the lower jaw mem r. This work, as previously described, and as illustrated in Figure 7, comprises a cylindrical shank, for example, as68, having at onev end a head 69, and intended to be threaded at the other end as at 70. The flat which is formed by the grinding wheel in the present 0 eration is indicated at 71.

- From the oregoing description, taken in connection with the accompanying drawings, the construction and operation of the present invention should be clearly understood and it will be seen that the mechanism is extremely simple ofoperation, inasmuch as it is merely necessary for the operator to lay a work piece on the lower jaw member 16, and, grasping the handle 29, give it a forward and upward movement, swinging the carriage 14 toward stone 8, During this swinging movement, the work isfirst automatically clamped between the jaws through action of cam 30 and plunger 32, and then brought with the pressure controlled by the hand of the operator against the stone! and a portion or. spot ground off until stop 46 limits its further inward movement. A reverse movement of the handle then rocks the carriage backward until its momentumis taken up b the shock-absorbing member ,61, while on t is reverse movement the jaws first release their grip on the work and the ejector fingers then subsequently force the work off the jaws with slight pressure, allow ing it to dro downward into trou h 60, which lateral y deflects same to a suitable receptacle.

We claim: i i

' 1. A mechanism of the character described including an oscillating carriage, means for oscillating the carriage, a positive stop for limiting the oscillation of the carriage in one direction, a yieldable stop for limiting its oscillation in the opposite direction,

means for securing work in position on the carriage, and an ejector mechanism adjacent said securing means and operable in synchronism with the-yielding stop mechanism.

2. A mechanism of the character described including a work engaging jaw, an ejector member mounted adjacent said jaw, means for forwardly actuating saidejector, means for rearwardly urging the ejector, and ML justable mechanism for limiting the rearward movement thereof whereby saidejector will serve to control the initial positioning of a work piece on thejaw member.

' 3. A mechanism of the character described including awork engaging jaw, an ejector member mounted adjacent said jaw, means for forwardly actuating said ejector, means for rearwardly urging the ejector, adjustable mechanism for limiting the rearward movement thereof whereby said ejector will serve to control the initial positioning of a work piece on the jaw member, a second 'jaw member adjacent the first, and means tion for retaining the parts in shifted position. a

5. A device of the character described including a shiftable carriage, means for supporting the carriage in an intermediate rctracted position, said carriage having a work support and a work engaging member adjacent the support, adjustable means for limiting the rearward vmovement or the, work-engaging member relativeto the work.

support, and additional means for projecting the work-engaging member beyond the work support for ejection of a work piece therefrom.

6. A device of the character described including a shiftable carriage, means for supporting the carriage in an intermediate retracted position, said carriage having a work support and a work'enga ing member adjacent the support, adjustab e means for limiting the" rearward movement of the workngaging member relative to the work support, and additional means for projecting the work-engaging member beyond the work support, for ejection of a work piece therefrom, said means being automatically operable on rearward shifting of the earriage relative to its normal intermediately su ported position. I

g In mechanism of the character described, the combination with a worlrcar riage having a jaw receivin J recess, of a reversible jawblock mou'nte within the recess and having opposite sides formed with ii -shaped work receiving notches of different dimensions and having on each side adj acent the notch a portion for selectively engaging a wall of the jaw receiving recess for automatically positioning the jaw relative to the carriage when the opposed notch is in operative work receiving position.

-8. In mechanism of the character described, the combination with. a movable carriage having a work receiving jaw, of a bar 'pivotally mounted in the carriage, ls-shaped tingers on the bar projecting adjacent the jaw, spring means for holding the fingers in retracted position, an arm on the bar," an adjusting device carried by the arm, an abutment on the carriage in the path. of the adjusting device for engagement therewith to limit the normal retracted some movement of the bar and fingers, and a stationary abutment disposed in the path of the arm as the carriage is moved for swinging the arm and thus the fingers to impart an ejecting movement to the latter.

9. A mechanism of the character described inc'ludin a base portion bearing a shaft, an oscillating carriage pivotally mounted upon the shaft and having a workengaging jaw, a clamp head pivoted to the carriage and having a portion for co-operation with said jaw and a second actuating portion, a yieldable plunger supported by the carriage and having an adjustable engagement with the actuating projection of the clamping head, and a stationary cam member carried by the shaft and engaging the plunger for automatically reciprocating the plunger to actuate the clamp head on swin ing movement of the carriage about the s aft as a pivot.

10. A. mechanism of the character described includin a base portion bearing a shaft, an oscillating v carriage pivotally mounted-upon the shaft and having a workengaging jaw, a clamp head pivoted to the carriage and having a portion for co-operation with said jaw and a second actuating portion, a 'yieldable plunger supported by the carriage and having an adjustable engagement with the actuating projection of the clamping head, a stationary cam member carried by the shaft and engaging the plunger for automatically reciprocating the plunger to actuate the clamp head on swinging movement of the carriage about the shaft as a pivot, pivotally mounted ejector members supported by the carriage for movement relative thereto, spring means for actuating the ejector members in one direction, adjustable means for limiting the actuation of the members in said direction, and additional means for positively shifting the ejector members in operative engagement with the work in opposition to the actuation of the clamping head.

ll. A grinding machine including a grindingwheel and a support adjacent the wheel, a shift-able carriage mounted on the support and having work clamping and work ejecting portions and a shiftable membe'r for controlling the movement of the carriage and associate parts, said member being shiftable in one direction to cause a clamping of the work and a feeding action of the same against the grinding wheel and movable in, the opposite direction to cause a release and ejection of the work.

In testimony whereof, we have signed our names to this specification this 21st day of November, 1924c.

GEORGE lV. BINNS. 'WALTER D. ARCHEA.

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