US1268967A - Grinding-machine. - Google Patents

Description

J. W HAMPTON GRINDING MACHiNE.

APPLICATION FFLED APR. 9. @911.

3 SHI'JHS'SHEET l.

J. W. HAMPTON.

GRfNDiNG MACHINE,

APPLICATHJN men APR, 9. I917 1,268,967. Edwin-(1.1m 11. 1918.

J. W HAMPTON.

GRINDING MACHINE.

APPucATmN mm APR. 9. Hmv

1,268,967. laivnh-d Junv 11, 1918.

3 SHLEYS SHEE? 3.

" 0 auto rises from the center of the said legs,

UNITED STATES PATENT OFFICE.

JOHN WADE HAMPTON, OF BEREA, OHIO, ASSIGNOR TO THE CLEVELAND STONE COH- PANY, OF CLEVELAND, OHIO, A CORPORATION OF GHIO.

GRINDING-MACHINE Specification of Letters Patent Patented June 11, 1918 Application filed April 9,!917.

To add "whom it may concern Be it known that I. John WADE IIAMP- TON, a citizen of the United States, residing at Berea, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Grinding Machines, of which the following is a full, clear, and exact description.

en ax heads, or axes, as they are comcalled and as they will be hereinafter come from the forge, they have to be and sharpened. The conventional shape to which these ax forgings have to be ground is shown in Figure 6 of the drawings. They are slightly convex on both sides, and the sharpened edge is also slightly convex.

The present invention resides in the machine shown in the drawing, so constructed that a plurality of ax forgings may be put into its embrace after they come from the forge, whereupon the machine will automatically grind them into the required shape so far as concerns the sides and cutting edge thereof.

he invention consists in the construction. and combination of parts which are em. bodied in theunachine shown in the accompanying drawings and are hereinafter described, all as definitely pointed out in the ap ended claims.

11 the drawings, Fig. l is a vertical. sectional view of a machine in which the invention is embodied; Fig. 2 is a plan view of said machine; Fig. 3 1s a sectional end view on line 3-3 of Fig.2 of one of the ax holding arms and an ax held thereby; F ig. 4 is a sectional view of one of the arms In the line indicated by 4-4 on Fig. 2; Fig. 5 is a sectional plan view, the section being in the plane indicated by line 5-5 on 1; and Fig. 6 is a view of such an ax as may be ground into shape in the machine shown in the other views.

The frame work of the machine includes a base 10 and vertical tubular met 12 which base, suitable legs 16, an annular trough 15 sup orted by an annular table fixeif to said trough, and various brackets to be hereinmonl calle ground into shape after referred to to whatever extent may be necessary.

Thdgrindston' 20. 1s a horizontally disposed annulus; and the grinding of the axes Serial No. 160.804.

is done by the upper which. is concentric with and outside of the I post 12; and said sleeve 22 has a sliding driving tongue and groove connection 22 with this shaft. The platfornl 21 is supported on an antifriction step bearing 25 carried by a vertically movable externally threaded sleeve 30 which has a slidin cu gagcmcnt with the shaft 23 and has in its top a recess 3 for the reception of the anti frietion step bearing 25. This sleeve 30 is concentric with the post 12. and is vertically movable with respect thereto. It passes through a hole in the table 1+1 and is formed with a vertical groove 32 for the reception of a tongue fixed to that table Whereb this sleeve may not rotate. A nut 34 whic is screwed onto the sleeve 30 rests and is 1'0- tatable upon the table 14. formed with external. gear teeth 35 which are in mesh with a pinion 3G fixed to a vertical shaft 37. This passes through and is rotatably mounted in a hearing which is a part. of the table 14. The shaft 37 has at its lower end a beveled gear 38 which meshes with a bevel gear 105 fixed to a horizontal shaft 106, mounted in suitable bearings and having an operating hand wheel on each end. When the shaft 37 is turned, the nut 3-1 is rotated and the sleeveiill willthereby be raised with the result of raising the platform 21 and the grindstone thereon. This vertical ad justmcnt of the grindstone is for the purpose of keeping the upper operative face thereof in substantially the same plane as said face is ground off by the operation of the machine.

The shaft 23 has a bolt pulley 27 keyed to it near its lower end. and this shaft and pulicy are supported by an antifriction step bearing 28 mounted in a recess 10 in the base 10 of the nmchinc. It is to be understood that a belt will engage with this pulley :27 whereby the grmdstono will be turned.

Concentrically arranged within the post 12 and rotatably mounted therein is a vertical tubular shaft 40. This shaft has rigidly secured to its upper end a head 4-1 and this head rests upon the upper ends of the post Ihis nut is 35'. head to be ground.

" "big be 12 and the vertical ehaft 23. and thereby the tnbularshaft 40 is supported in the position shown, A. large gear'45 is fixed to the loyver end of the shaft 40, and thereby it may be turned by a. suitable train-of gearing which ill be presently described. This vertical shaft 40 me have the desired speed relative to that of t e Tndstone. Rotetable ilfiie m'ings carried by this tububar shaft 40, and concentrically disposed therein; is a shaft 50 which projects at both ends from said tubular shaft and it has a large gear 51 fixed to its lower end whereby it may be rotated. The collar 52 is fixed to its up or end and this rests u on the upper 'end 0 the shaft 40 whereby t 1e shaft 50 is meintalined in the stated position. There is also fixed to the projecting ripper end of the shaft 50 an eccentric 53 which me be e 2 part of the collar 52. Alltlm-e of t edescribed shaft-s40 and 50 and the shaft 23 and with it the grindstone are all rotated in the some direction but at different speeds by suitable mechanism some of which has al- 25 ready been partly explained. A plurality of ex holding levers 60 are connected each by a hall and socket joint 61 with the head 41, and extend from the said ball andsocket commotion in a substentielly radial but downwardly inclined direction toward the upper surfni'e of the grindstone 20; and each of these arms is provided at its free end with means by which to ,clamp to its under face an ax T here i an oscillating ring 70 mounted 'upon the head 41 in a horizontal position, said ring' being concentric with l'hepost 12.

A bell crank lever 80in ivoted on a verticalf axis toL-the head an one arm 81 of this lei'er has near its outer end in horizontal slot-'82." A verticnlpiu 72 lixod totl o' ring "3'0 projects up into this slolu 'llnother Min of this bell crank lever 89 1mm long arcn5 shaped slot 83, The eccentric 53 above r c-i ferred to is surrounded by an eccentric strap 54 which is connected with the mm of the leverRO through which said longnrc-slmped "slot 83in; formed by means of a pin 55 9 which may be fixed to the later 80 at any point in the length of said-slot 83. It is obvious. therefore, that as the Qhlift 7 turns this lam-'83 will be rocked. with the reeult of'impm'ting'to the ring 70 ,u back and forth ,oecillotmg movement with reopen-l to the heodi ih'clen th ofwhih movenent may be varied as- 'eelred.

. It is; to beremembered;however,that. the

1, andWIIet'thiEhead constantly isfi'otetoau'se it la -fixed to the rot iting elicited? t As'sooiaitedjwithnach lever aremean this rin'g TQ for causing said carried" by y levers to oscillate about their ball and block when the surface of'the ex is ngarly finished v11l come down 1nlo 4-i1ntnoi4 1yitl1 a nod ex and therefore determines; when the grinding thereof shall rennet.

nu me rm e other? similar apms are shown 1 the on Thegse moans consist of lnvq -jamvs 67 nvol'ed to the em t-ll. the lower ends of Aepiing 68conneolsthe upper ends of these-twp awe and tends to move them so socket connections with the bend; -e=mid moans consisting of two pins 75 which cxtend upon opposite sides; and into engagement with the lever 60.

It is obvious therefore that eaohnit -hold- 70 in lever 60 will have imported to it a pccu ier motion, namely, it will oscillate on a circular arc of which the center is the center of the hull and socket joint by which it in'connected with the Head 41, and of CUUISG this movement will. be imported to the on head with the result of grinding the curved vuttin r edge on said ,ax. i

It desire le alz-mitlmt the ax shall have a rocking motion from side to side in con tool. with thegrinding face of the grindstone in'order to grind the outer face of the-ax .into the conventional convex shepe. This slight mocking-motion or twieting of the arm 0 is irodooed by means .of a. pin 63 which is KG-(hi0 and extendn downward from lhelever '60 into n homer) in :1. part 46 rigidly fastenedto theiroztntmg head 40. This arm 60 oscillates in an arc oi which the bull and si'ickct joint is the center. The lower part of this arm 60, or rather the lower end of the pin (#3 is restricted in this oscillating movement by its engagement in the hole 45 of the port $6. Th s rocking motion .of each an in content with the grindslone ounces the side ofthe axio be ground into convex 'for nl B ilt theex-act shape of this surfncewis;cleterminediiry a pattern block 64 fixed to the ,11r1n ,n'l1)ch flange 41 on the head. 'lEhc engogement atte nrblooknitli this; finiige also lnnll's the downward niui'en eiili dif the arm \Vhile only one of the,a x holding levers 60 is shown completely in 'thc droning-n, the

places for the connection in ilm machine of and 'it is to beundorstood thntlon of ll eso arms more or l(-.-:H are to be pivoted in the described manner lothchea'd 40 and to'projcct 'thcrefroni in snbstnntinliy redial down- .wiu-tllyinclined directions sorihet the axes jfi xed to ilie ouds of tl wseer eev'ill engage tligfltop"surfin-u of the gblut n grindstone. At: the oulenend of elicit o tbeoellever :irms 60 are, lueuns slated -for holding wh ch nee beveled nnil iii-e og'l qiled to enter the eye t of the ex ii -ed uud clamp it up against the under fu ceoithe arm 60.

as. "to rblaSofllB on when permitted soto crating 111g 9; which willgo between and ran H a bevel "on Fig. 5, and he wi each pair of aws 67 lar shaft 40 consists which the terminal gear 90 en es the r '45 on the lower end of this raft.

train of gears includes the vertical shaft 91, and the other terminal member of this train is a worm wheel 92 which is engaged by a worm 98 on a worm shaft 94.which carries step pulleys 95 by means of which this shaft may be rotated at either of three speeds according to requirements.

The gear 51 which is fixed to shaft also receives "'6 rotary motion from this same shaft h l-through a bevel gear 96 fixed to the said shaft in en agement with r 97 that is fix to a vertical shaft 98 aving on its lower end a pinion 99 which in turn engages with a pinion 100 which in turn engages with the ear 51.

he operator of a machine 0 this sort may stand adjacent either side of the ma.- chine adjacent the ositions marked B-- B lput' into the grasp of one of the ex heads to be ground, and then allow its weight and the weight of the outer end of the arm to carry the lower face of this ex against the top surface of the 'ndstone.

The grindstone will c revolvm at about three hundred turns per minute. he shaft 40 will be rotated at a speed such that it will turn through one bomplete revolution or one half a revolution during that period of time required to grind the face of the ax, so about 10 to 14 minutes.

ilhe shaft 50 will be rotated at about seven to nine revolutions per minute. Therefore, whi an given arm. 60 is;v being moved around t e' circle from the point at which the ex is fastened thereto until it gets back to substantially the same point, said lever will he rocked sidewise by the oscillation of the ring from seventy to one hundred and twenty five times and each time said lever will have the sli ht rockin movement which will cause the grinding w eel to put the convex face on said ax..

In using the above described machine, the operator-stands at or near one or the other of the two positions-indicated by 5. where he is within easy reaci of one of the haud \v'lxccls on the shaft.

An each of the ox holding'arms 60 comes to him he nits an ex in the embrace of the clamping evices 67 thereon. and late that tax, drop down onto the rotating grindstone; 'undhe does this until each 7 carries an ax n theposition stated. The

of these arms slowly rotating head. carries each of these arms entirely around and back to the start ing point. As it is bein so carried, it is being oscillated as uponlt shaft 50 may B on Fig.

e substantially ver tical axis of the bell and socket connection with said head by the oecilleting ri'ngKO. At the same time said am is being oscil' lated abouothe longitudinal axis of said arm. At all times t e face of the, be-

mg pressed down by its own weight and the weight of the arm on the upper su'r fince of the rotating grindstone,-with the result that before anyarm comes around to the loadin Eosition referred to, the .faoe of the ex l ave been ground Into the desired shape. Duringvthe last part of this wine!- ing operation the pattern block wil have come into contact with the flange 41' on head 41 and this engagement accomplishes two usei'ul purposes, viz first it causes the twisting oscillation of the arm :60 totake place in a precise path such as results in the accurate shaping of the convex surface of the ex; and second, it limits the clownward movcment of the arm andrconsequently prevents the grinding away of the ax after it has been ground to the extent desired.

ouch arm-60 reaches the loading position, tho ax whose surface has been ground will he removed and another ax putin its, place. Obviously, therefore, a plurality of axes, as man as there are arms, may be undergoing t e Witi some fobs, the grinding e'the head is turn e half of one revolution. In that ovqnt an operator may be stationed at each of the loading ositions marked B; and each man will take romleach arm the round ax which the other man put onto said arm.

The rates of rotation of the head 41 and be easily chaned without changing the rate of rotation 0 stone by shifting the driving beltto one or the other 'of the cone pulleys 95 on shaft 94.

avingdescribed my inventioml claim 1. In a machine of the character specified, the combination of a rotatableihorizontal gnndstone having a shaped top, rindin'g surface, a concentric rotatable hea ,means to simultaneously rotate said grindstone and rinding operation at the V ice the grindi head, theformer rapidly and the latter slowly, a

d and extendi .over' and toward said grmdstone, means t clam the work to the under side offlie outer to oscillate said arm about the sub- Sbdnlilfllli vertical axis of the pivotal connection etween it and, said head as said work holding-arm pivoted tosaid -of said arm, and

pivotal connection is being carried around r work a so other lever arm to cause said lever to oscillate upon itspivotal support, a concentric vertical shaft, an eccentric fixed thereto, an eccentric strap about said eccentric, and an adjustable connection between said eccentric strap and the other arm of said bell crank lever.

11. In a machine of the character specified, the combination of a rotatable horizontal grindstone having a shaped top grinding surface, a concentric rotatable head, means for simultaneously rotating said two parts,the former rapidly a d the latter slowly, a plurality of work olding arms connected to said head by universal joint connections and extending therefrom over and toward said grindstone, a ring concentrically mounted upon said head, means to oscillate said ring about its axis relative to said head, and means producing an .operative engagement between said ring and all of said work holding arms.

12. In a machine of the character specified, the combination of a rotatable horizontal grindstone having a shaped top grinding surface, a concentric rotatable head, means for simultaneously rotating said two parts, .the former rapidly and the latter slowly, means to adjust said grindstone verticall upward, a work holding arm connected with said head by a ball and socket joint and extended over and toward said grindstone, means to clamp the work to the under side of the outer end of said arm, and means to oscillate said arm about the substantially vertical axis of the universal connection between it and said head.

13. In a machine of the characterspecified, the combination with a base having an upright cylindrical post, a shaft rotatably mounted around and upon said post, a. grindstone supporting platform which embraces said shaft and has a sliding driving connection therewith, a step bearing supporting said platform, an annular grindstone supported upon said platform having a shaped top grinding surface, a tubular shaft concentrically mounted within sa'd post, a head fixed to the projecting upper end of said shaft, a work holding arm,connected with said head by universal joint connection and extending therefrom over and toward the grindstone, a ring concentrically mounted upon said head, connections between it and said arm, a shaft concentrically mounted within the head carrying tubular shaft, a bell crank lever pivoted to said head and operatively connected with said oscillating ring. an eccentric fixed to the projecting upper end of said central shaft means connecting it with the other arm of said bell crank lever, and means for rotating the said three shafts at different rates of speed.

14. In a machine of the character specified, the combination of a base having a. cylindrical tubular upright post, a tubular shaft around and rotatably mounted upon said post, a platform around and concentric with said shaft and having a sliding driving connection therewith, a step bearing for said platform, a vertically adjustable member supporting said step bearing, means to adjust said member vertically, and means to rotate said shaft.

15. In a machine of the character specified, the combination of a base having a cylindrical tubularupright post, a tubular shaft around and rotatably mounted upon said post, a platform around and concentric with said shaft and having a sliding driving connection therewith, a step bearing for said platform, an externally threaded cylindrical tubular member supporting said step bearing, means to prevent the rotation of said member, a rotatable threaded nut having external gear teeth whichis screwed onto said member, a fixed table on which said nut is supported, a pinion engaging said nut, and means to rotate said pinion.

16. In a machine of the character specified, the combination of a rotatable horizontal grindstone, a concentric rotatable head, and a concentric rotatable shaft, means to simultaneously rotate said three rotatable members at different rates of speed, the grindstone rapidly, the head very slowly, and the shaft at an intermediate rate, a rin mounted concentrically upon said head and capable of oscillation thereon about its axis, a bell crank lever pivoted on a vertical axis to said head and connected with said ring, an eccentric fixed to the rotatable shaft, an eccentric strap embracing the same and connected with the other end of said bell crank lever, a plurality of work holding arms pivoted 'to said head and extending outward therefrom over said ring and downward to the top surface of the grindstone, means carried by the outer ends of these arms for holding the work, and means carried by said oscillating ring engaging the several arms to cause the arms to oscillate on their pivotal connection with said head.

In testimony whereof. I hereunto aliix my signature.

J OHN' WADE HAMPTON.

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