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D86. 10, 1946. I J_ 5i BLOOD ' SURFACE GRINDING MACHINE 2,412,199 ‘ ‘ Filed Nov. 2, 1945~ 78 T! INVENTOR. ' JOEL S. BLOOD I ATTORNEY ' I Patented Dec. 10, 1946 2,412,199 .ZYfUNITED STATES orrlcrsv 2,412,199 ‘ A SURFACE GRINDING‘ MACHINE Joel s. Blood, San (and, cam} : ‘ Application November 2, 1945, Serial No; 626,418 (01. 51-241) 5 Claims. ' (Granted under [the act of March, 3', 1883, as amended ‘April 30, 1928; ‘370 0. G..~757) screw‘ threaded portion’ M at its, extended end portion. The pivot post mounted on the‘ ball J8 isthereby swivelly. engaged with the spider 3. Tolcontrol the ‘position of the pivot post 12, a levelling plate I5 is secured to‘ the pivot post in - This invention relates to grinders and (‘more particularly to mountings therefor. ‘Objects of the present invention are to provide for the accurate grinding of marginalv edge por tions'lof'opening's in walls, ‘partitions, bulkheads a 'circum'jacent position. Stud bolts l6 are‘screw; andgother members having openings therein; to threadably engaged within the levelling plate l5 provide an improved grinder for reducing por in a position to engage the spider member 3'and tions' of members ‘surrounding openings therein by their adjustment, position the levelling plate to a predetermined plane; to provide an improved and. thus the pivot post l2 in relation thereto. mounting for grinders adjustably embracing 10 A roller bearing I‘! having an inner'race l8, bounding edge portions of’ openings in members rollersv l9 ‘and ‘outer race 20 islmounted onrthev to be‘ ground; to provide a mountingior grinders pivot-post by the screw threaded‘engagement: of accurately restricting the movement of the grind~ the inner race I8 on the male screw threaded ers to predetermined‘ planes of movement; to portion I4.‘ The ‘spaced relationship between the 15 provide a grinder mounting capable of restrain bearing l1 and the spider 3 is adjustable by ‘screw ing grinder manipulation to. circular paths of ing the inner race of the bearing 18 on the pivot predetermined radii; to provide amounting for post l2. To look the bearing H in place in ad a portable grinder ‘permitting convenient manip justed position," the lock nuts 2| and 22 are‘ tight ulation of the grinder while the grinding means ened against the bearing 11, the lock nut 22 ‘being ismaintained in a predeterminedplane- of move 20 provided with a depending frusto-conical portion ment; and to provide improved elements and to assistin positioning the inner bearing race I8. arrangements thereof in a 'mountingof the char-. To provide greater security the nut‘ 2| is slotted acter and for the, purposes set forth. ' as at 23. A stud'bolt 24 is engaged within the locking‘ nut 21 so as to compress the slot portion In accomplishing these and-‘other objects of thepresent invention, I have provided improved 23 and jam the'locking nut. A lubricating open details of structure, the preferred form of which ing 25 is provided through the outer race 20 of is illustrated in the - accompanying drawing, the bearing 11. _ Bearing seals 26 are provided to wherein the simple ?gure is-a side elevational retain lubricant within vthe bearing. view'oi the improved grinder 'and mounting em 30 A rigid‘ arm’member 21 is secured to the outer bodying the features of the present invention, race;20 of the bearing I‘! ‘as at 28 in a'radially. part of the device being‘ shown in cross-section. extended position. The arm member is secured .Referring more in detail to the drawing: _ ' so as to rotate about the pivot post I2 in a plane 1 indicates a member having an opening 2 formed therein, the bounding edge portions-of 35 said‘opening'. being a surface required to be ground. I ' ‘ A spider member 3 having a-central body por tion 4 and radially extended leg portions 5lis positioned within'the opening 2. Stud bolts 6 are screw threadedlyengaged to the outer end portions of the legs 5 so as to be radially extensi ble. ‘ The spider member 3 is secured‘ in the open of movement substantially at right angles to the pivot post. ' "ll-1- ' A screw threaded opening 29 is formed in the outer end portion of the arm member‘Z'l and a bearing'supporting element 3!] is screw threadedly engaged ‘in the arm. vA roller bearing 3| having 40 an inner race 32, ball bearings 33, and outer race 34 is mounted on the outer extended end portion of the arm member 21 by the supporting" element 30. A spacer 35 is interposed between the inner ing 2 by rotating the stud bolts 6 to engage the race 32 and the‘ arm member 2'1. A collar 36 surrounding member I. A socket 1 islformed in 45 embraces the outer race 34 of the bearing 3| an thevce'ntral body portion 4 of the spider‘3. ' inner ?ange portion .31 thereof extending between A ball-shaped element 8 having a screw thread ed opening 9 formed therein is positioned ‘within the outer race and the arm member 21.. An an maintain the pivot post securely in engagement as at 4| so as to pivot with the collar on the bear nular plate 38 is positioned circumjacent the the socket ‘I. Retaining plate I0 is secured as at H to the spider member 3 to retain the ball 50 supporting element 30 and is secured to the collar 36 by screw threaded means as at 39. Thecollar shaped element 8 in place. > A pivot post [2 ‘is screw threadably engaged 36 and plate 38 tightly embrace the outer race 34. within the opening Set the’ ball element 8.. To An arm extension 40 is secured to the collar'36 within the ball 8, ‘a locking means is‘ provided as 55 ing‘supporting element'30 in a plane substantially; atl'3'l. f The pivot post I2 is provided. with-‘a male 3 2,412,199 4 parallel to the plane of rotation of the arm mem ber 21. a universal coupling permitting swivel movement . of the shaft 12 in relation to the shaft 88 without It is sometimes desirable to lock the articulated interrupting the communication therebetween. joint so that the arm 21 and extension 40 are rigidly connected. To this end, socket openings 42 are formed in the collar 36 on the surface thereof 'facing'the arm member-21in ‘a circular pattern arranged colaxially to the pivot center of the articulated joint. A receiver 43 is formed in Cl To permit this freedom of motion it has been found necessary to sever the housing 53 as at 8|. _ The severed housing at 8| is provided with co operatively engaged tongue and groove portions to guide the movement of one portion of the housing 53 on the other. Rotation of the housing in the the arm member 21 in spaced relationship to the 10 , plane of the'arm member 21 and extension 40 is permitted by the movement of the housing 53 and the receiver 43. The pin 44 has a spring engage the keeper 58 within the opening 5|. ing shoulder 45 and a knurled head 46 formed A-driving spindle of a conventional prime mov thereon. A spring 41 is positioned. within the er, not shown, is indicated at 82. receiver 43 so as to bear againstthe shoulder~45. 15 ‘Toconnect the driving spindle 82 to the con A spring keeper 48 is screw threadedly engaged necting portion 16 of the shaft 12, coupling ele in the opening 43 circumjacent the pin 44 so as ments 83 and 84 are provided. The coupling 83 to retain the spring 41. To maintain thev pin in ,is screw threadedly engaged to the male coupling a disengaged position when it is desired to do so, portion 16. The coupling 84 is screw threadedly a receiving opening 49-is formed in the pin 44 engaged to the spindle 82. The coupling 83 has and a locking pin 58 engaged therein to hold the a recess 85 formed in the end thereof. The cou pin 44 in a retracted position. ' ' pling 84 has a projecting stud portion 86 formed An opening 5| is formed in the outer end por on the end thereof. The stud 86 is engaged within tion of the extension 48 having a ?ange portion the opening 85. To maintain this engagement a 52 inwardly disposed relative to the opening. A taper pin 81 is passed through juxtaposed open¢ gear housing 53 is ?tted within the opening 5| so ingsin the coupling 83 and the stud 86. The stud as to rest upon the ?ange portion 52. A bearing 86 is madeof a diameter slightly smaller than receptacle portion 54 is formed in the housing 53. the opening 85 in which it engages. Thisgdi?‘er A ball bearing having an inner race 55, ball bear ence in size imparts a ?exibility to the'coupling ings 56, and an outer race 51 is mounted within 30 of the prime mover to the shaft 12. the receptacle 54 by the engagement of the outer A housing 88 for the connection of the spindle race therewith. To maintain the bearing in posi 82 to the shaft 12 is screw threadably engaged to tion, an annular bearing keeper 58 is screw the‘ housing 53. ‘ threadedly secured to the housing. 53 as at '59, Operation the shoulder 52 being embraced by the coopera tivev action of the housing 53 and the bearing The operation of a grinder constructed as de ‘keeper 58. > scribed is as follows: ‘A shaft 60 having a pinion gear portion 6|, a sockets 42. A locating pin 44 is positioned Within - bearing engaging shoulder 62, a screw threaded The spider 3 is positioned within the openingv portion '63, and a grinder mounting portion 64 is 40 2 and locked in place by rotating the stud bolts 6 outwardly to engage the member |. The spider rotatably mounted in the inner bearing race 55. 3 ispreferably secured in a plane substantially A bearing lock nut 65 is screw threadedly engaged parallel to the surface of the member | to be to the threaded portion 63 in cooperation with ground, the pivot post |2 being positioned sub the shoulder 62 to embrace tightly the inner bear stantially in the center of the opening 2. ing race 55. A jam nut 66 is tightened against The pivot post |2 being swivelly supported in the bearing lock nut 65. A grinding wheel 61 is the spider member 3 by means of the ball ele mounted on the mounting portion 64 of the shaft ment 8, said pivot post I2 is positioned'substan 60. A‘grinding wheel washer 68 and a jam nut tially at right angles to the surface of the mem 68 are employed to secure the grinding wheel 61 in place. A double faced bevelled gear 10 is ‘ ber | to be ground by adjusting the stud bolts "5 to secure the levelling plate I 5 in selected mounted within the housing 53 to cooperatively spaced relationship to the spider 3. engage the gear portion 6|. A pin 1| is employed The inner race l8. ofthe bearing I1 is rotated to rotatably mount the gear 18 within the hous on the pivot post |2 to adjust the height of the ing '53 Oman axis of rotation substantially at right grinding wheel 61 supported thereby. The lock angles to the axis of rotation of the gear portion nut -2| is tightened into place and secured by 6|. A shaft 12 having arpinion gear portion 13, a tightening the stud bolt 24. The lock nut 22 is bearing‘embracing shoulder 14, a screw threaded also tightened into place, its conical portion en portion 15, and a male‘ coupling portion 16 is gaging the inner race 58 of the bearing |1. ' _mounted within the housing 53 in a position en , When it is desired to have the‘ grinding wheel gaging the pinion gear portion 13 with the oppo 61~conform to a circular path, the radius of ro site face of the bevelled gear 18 from that en gaged by the bearing portion 6|. the axis of rota tion‘of the shaft 12 being substantially at right angles to the axis of. rotation of the gear 10. ‘A roller bearing 11 is employed to mount the shaft 12 within the housing 53. An annular bearing retaining plate 18 is secured to‘the housing 53 tation thereof is determined vby the distance be~ VIZ. This distance‘is controlled by locking the tween the grinding wheel 61 and the pivot post articulated joint between the arm member 21 and the extension 40. The articulated joint is locked by permitting the spring loaded locating pin 44 to engage in a selected socket 42giving the de so as to bear against the outer race of thebearing sired radius of rotation. 11 and so maintain the bearing in position. A look nut ‘E9 and a jam nut 80 are screw thread 70 ‘When it ‘is desired, movement of the grinding wheel 61 may be restricted to‘ movement in a ably engaged to the shaft 12 as at 15 in coopera_ predetermined plane without'the circular limita tion' with the shoulder 14 to tightlyembrace. the tion. . o accomplish this, the locatinglpinr 44 is inner race‘of the bearing 11. . disengaged from the socket and held in such dis~ The gear portion 6|, the gear 101 and the gear portion 13 are cooperatively engaged to comprise 75 engaged position ‘by inserting the-lockingipin 50 ‘to hold the l'ocatingpin in retracted “position. 2,412,199 5 6 When the locating pin 44 is thus disengaged, the place within openings in members whose sur— rounding material is to be ground, a universal joint mounted in the spider member, a pivot post swivelly supported by the universal joint, 9.. level ing plate secured to the pivot post in circumjacent relation thereto, adjustment means borne by the leveling plate for embracing the spider and po extension 60 is free to pivot on the arm member 2? and the predetermined plane of the grinding wheel may be manually traversed at will. The communication of the driving force through the and shaft arrangement pre viously described from the prime mover to the sitioning the pivot post, a. radial arm member grinding wheel 6'? permits swivel movement of rotatably supported by the pivot post in a plane the spindle 82 and prime mover in relation to the mounting therefor. This swivel movement 10 substantially at right angles to the pivot post, screw threaded means on pivot post and arm permits the convenient manual manipulation of member for adjusting the height on the pivot post the grinder and enables grinding to be accom at which the arm member is permitted to rotate, plished in restricted spaces. an articulated joint in the arm member permit As the grinding of the member I progresses, the ting the outwardly extended end portion thereof grinder is lowered by readjusting the inner race to pivot in a plane substantially parallel to that 18 of the bearing I‘! on the pivot post I2. While I have shown but one embodiment of my of the rotation of the arm member, a grinding wheel rotatably supported in the outwardly ex invention, it is susceptible to modi?cation with out departing from the spirit of the invention. tended end portion of the arm member, and a I do not wish, therefore, to be limited by the 20 universal joint communicating between the driv ing means of the motor and the grinding wheel. disclosures set forth, but only by the scope of the 3. In a grinder mounting of the character de appended claims. scribed, a spider member having extensible leg The invention described herein may be manu portions for mounting the spider in openings in factured and used by or for the Government of the United States of America for governmental 25 members whose surrounding material is to be ground, a universal joint mounted in the spider purposes without the payment of any royalties member, a pivot post swivelly supported by the thereon or therefor. I claim: 1. An apparatus for use with a portable motor Comprising a spider member comprising a cen universal joint, adjustment means for position ing the pivot‘post in relation to the spider mem her, a radial arm member rotatably mounted on the pivot post to swing in a plane substantially at right angles to the pivot post, means on the pivot post for adjusting the location on the pivot the body portion, adjustment studs screw-thread post at which the arm member is permitted to edly engaged in the outer ends of the leg elements so as to be outwardly extensible; a ball element 35 rotate, an articulated joint in the arm member, a grinding wheel rotatably mounted in the ex supported in the socket of the body portion; a tended end portion of the arm member, and a retaining plate secured to the body portion to universal coupling providing communication be maintain the ball member in the socket; a pivot tween a prime mover and the grinding wheel to post sorew-threadedly engaged to the ball member and swivelly supported thereby; a leveling plate 40 rotate the grinding wheel in a plane determined tral body portion having a socket formed therein, a plurality of leg elements radially extended from transversely secured circumjacent the pivot post; by the adjustment of the arm member on the post; an articulated joint in the arm member tion of the arm member, a driving means for the permitting the pivoting of the outer end portion of the arm member in a plane substantially par allel to the rotation plane of the arm member; sockets and a spring loaded catch in spaced re lation thereto in opposite arm portions to lock grinding wheel, and a universal coupling inter posed between the driving means and grinding wheel permitting freedom of movement of the driving means while the grinding wheel is main tained in a predetermined plane. the articulated joint at selected points of adjust 5. A grinder comprising a mounting means en pivot post. a plurality of adjustment studs screw-threadedly 4. A grinder comprising a spider member hav engaged in the leveling plate in a position to en ing extensible leg portions, a pivot post swivelly gage the spider member and in cooperation there with to maintain the pivot post in selected posi 45 mounted in the spider member, an arm member rotatably mounted on the swivel post, means for tion; a radial arm member; a roller bearing screw adjusting the plane of rotation of the arm mem threadedly mounted on the pivot post spacially ber in relation to the spider member, an articu adjustable thereon in relation to the spider mem lated joint in the arm member, a grinding wheel ' ber and rotatably supporting the arm member in a plane substantially at right angles to the pivot , supported in the outwardly extended end por gageable in openings in members to be ground, ment; a grinding wheel; a mounting shaft for a pivot post swivelly supported by the mounting the grinding wheel; a bearing engaged in the out wardly extended end portion of the arm member 60 means, a radial arm member rotatably mounted the pivot post, means for adjusting the plane to support the mounting shaft substantially at of rotation of the arm member in relation to right angles to the plane of rotation of the arm the mounting means, a grinding wheel rotatably member; a universal coupling means engaged to supported by the extended end portion of the arm the mounting shaft; and a coupling member for connecting the universal gear means to the driv 65 member, means for varying the distance from the grinding wheel to the pivot post and a driving ing means of the motor. 2. A grinder adapted for use with a motor com means supported by the arm member in com prising a spider member having extensible leg portions for tightening the spider member in munication with the grinding wheel. JOEL S. BLOOD.