US1848725A - j johnson - Google Patents

Description

March 8, 1932.

A. J. JOHNSON BORING MACHINE} 4 Sheets-Sheet Filed May 24, 1929 hue/17 0)" AL FEED IJZJHNJON ATv-azNE'Ys March ,1 A. J. JOHNSON 1 ,848,725

BORING MACHINE Filed May 24, 1929 4 Sheets-Sheet. 2

Arrow/yew? Mrch '8, 1932. A. J. JOHNSON BORING MACHINE 4 Sheets-Sheefl 5 Filed May 24, 1929 I ATTORNEYS March 8, 1932. A. J. JOHNSON BORING MACHINE Filed May 24, 1929 4 Sheets-Sheet 4 3 M S S N.

3 Q9 QQ ATTOZNEYJ Patented 'Mar. 8, 1932 1 nmrsn STAT ALrRnnJ. JOHNSOK OF'EA'U CLAIRE, Wisconsin "BORING liviAox-iilm Applicationffil ed ma 24, 1929, Serial n se asas f This invention relates to an'i'mpro'vedborlngvmachine adapted for such use as reb'oring and finishing engine bearings.

justably mounted so that it may be readily alined with the bearings, and a power device being adjustably supported upon one end of said supporting member and having means means provided-for alining theboringibar with the bearings; the means for supporting- V the b'oringbar; the means providedforcon-v necting thelboring bar withthe power: device; and. for alining the poweri'devicewith the boring bar; the means for manually longi tudinally moving the'bor-ingb'ar -aiid, in the foroperatively connecting it with the boring bar, whereby the latter may be powerdriven,

said power device being adapted to operate tl e boring barat different speeds tofaci-litate and expedite the operation of reboringthe bearings. d V.

A further object is to provide a portable boring machine comprising parallel H bars adapted to be securedto the face of the en: gine frame, a plurality of bridge members adapted to be adj ustably secured'to said bars,

- so and a supporting member of very rugged con:

struction being mounted on said bridge mem bers and provided with means for adjustably supporting a boringv bar,. said supporting member being located toone side of the longitudinal centerline of the machine so as to.

provide ample clearance forxremoving and replacing the bearings, when necessary, wh11e the boring machine is mounted on the engine and wherebyan unobstructed view of the.

boring bar is obtained so that the mechanic may readily note the "operation of the cutting 1 bOOlb. A V. v I v y 7 Features of; the nvention res1de"1nf the t heannexedg claims. h I g V In the accomp'anylng drawings, there has general construction of the machinej'as a whole.

j Other Objectsof theinventionwillappear from they following descriptim and accom- 7 panying drawings and will be pointed out-in been disclosed a structure designed to carry outthe various ob e cts of the 1nvent1'on, but

it is to be understood thattheinvention isnot confinedto the exact featuresshown as ya rious changesniay'be made within the scope of theclaims which follow.

Inthe drawings Figure l y is a perspective view showingniy improved machinew' ththe power device 'removed therefrom;

Figure 3 is anenlarged sectional plan view Figure 2 is a sld'e elevati on' of the m on the. line*813 of'Figure 2, showing the means for controlling the feed of theboring Figure line 4.4 of Figure 2; V

bar; W I v l is a vertical Figure 5 is an enlarged vertical sectionalvi'ew on the l1ne'5f'5 of Figure 2 7 Figure 6 is a vertical sectionalview on the line 6'-6'of Figure 3; Figure "'7 is alsectional plan view "on the line 7-7 of'Figure 6', showing the'means for 'alining the power device with the boring bar; K r i t Figure 8 is ea en sectional view on the line" 88 of Figure 5, showing" the driving means for the boring bar;

Figure-I 9 is "a, detail "sectional view showing the universal connection "provided between the boring bar and tli'epowerf device f frame and the means-provided for relatively edj Listing the, boring bar with respect the Figurel l is a perspective view illustrating a-portionpf a crank caseand-showin'g thej v v means for: alining-Lthe boringbar with-the l engine .fraine bearings; -v

.1. Figure v:12 is a perspective, viewfjshowizng sectional view on the.

Figure 1011s a .vertical'sectional view'shfowmg the apparatusmounted upon an' ue'ngine one of the collars for alining the cutter bar with the bearings; and

Figure 13 illustrates a portion of an engine crank case showing a bearing secured therein.

The novel boring machine shown in this invention comprises a boring bar 2 having a plurality of sockets 3 therein adapted to re ceive cutting tools 4, shown in Figures 2 and 4. These tools are adjustably mounted in the boring bar so that they may be adjusted to the proper position te-accurately bore the engine bearings to the right diameter! Means not shown, are provided for securing the tools 4 to the boring bar.

The boring bar 2 is suspended from a supporting member 5, adjust-ably mounted on spaced bridge'members 6 by means of split hubs 7, preferably integrally formed with the brackets. Each bridge member is provided caps of the intermediate bearings with base portions 8 having slots 9 adapted to receive bolts 11, the heads of which are here shown slidably mounted in "f-shaped slots 12, provided in a pair of parallel bars 13, adapted to be secured to the bottom face 7 14 of an engine crank case or frame 15, when the latter is inverted, as shown in Figures 4 and 10. The parallel bars 13 are adjustably secured'to the crank case by suitable bolts 16, shown in Figure 1. The threaded terminals of these bolts are adapted to be received in the usual threaded sockets17, provided in the face 14 of the crank case, as, shown in Figures 4 and 11.

The means for supporting the boring bar 2 on the member v5, consists of a plurality of brackets 18, each having a split hub 19 mounted on the supporting bar 5 and secured thereto in adjusted position by cap screws 21. Eachbracket 18 further has a split hub 22 arranged at right angles to the bore of the hub 19, and these hubs are adapted to receive a plurality of shanks 23 each having a bearing 24 provided at its lower end adapted to rotatably receive the boring bar 2', as best shown in Figure 1.

Torebore the alined bearings in a crank case or engine block, particularly the crank shaft bearings, the two end bearings are usually removed from the crank case as shown in Figure 11, to facilitate alining the boring bar with the bearings. These bearings usually comprise a lower member 20 and a cap 25 apertured to receive studs 26, secured to the crank case 15 as shown in Figure 13. The (not shown) are also removed from their complementary lower members, after which a pair of alining collars 27 are seated in the semi cylindrical bearing seats 28 provided atthe ends of the crank case. These alining collars 27 are adapted to snugly fit in the concaved seats 28, and each is provided with bore 29 adapted 'to'rotatably receive the boring bar .2, as shown in Figure 11. By thus supporting the boring bar 2 in the two alining collars 27, positioned one at each end of the crank case, the boring bar will be axially alined with the axis of the several bearings.

The parallel bars 13 may then be secured to the face 14 of the crank case, as shown in Figures 4 and 10, and the bridge members 6 positioned thereon, as best shown in Figures 1 and 10. The cap screws 30 mounted in the split hubs 22 of the brackets 18, and also the cap screws 21 in the hubs 19, are loosened to permit the shanks 23 to be ad justed with respect to the supporting member 5. The boring bar 2 is then inserted in the bearings 24, at the lower ends of the shanks 23, after which it is axially alined with the crank shaft bearings by means of the alining collars 27, fitted onto the end portions of thebar. 'lVhen the boring bar has thus been alined, the bolts 21 in the hubs 1.9 are tightened to secure the brackets 18 to the supporting member 5 and, in like manner, the bolts 31 are tightened to secure the shanks 23 in position in the hubs 22, thereby rigidly supporting the boring bar a fixed distance from the supporting member The alining collars 27 are then removed, and the end bearings 20-25 secured to their respective seat-s 28,.as shownin Figures 2 and 13, after which the cutting tools 4 are mounted in the boring bar 2,'as shown in Figures2 and 4. I

One of the features of this invention re-' sides in the means provided for driving the boring bar 2. In machines of thischa'racter, the boring bar is usually manually rotated by a suitable crank, terminally secured to one end thereof, and the axial feeding of the bar is accomplished by the provision of suitable threads on one end of the boring bar adapted to be engaged with a suitable nut or member retained in fixed relation with respect to the crank case;

In the apparatus here shown, the boring bar 2 is driven by a power device adjustably supported upon one end of the supporting member 5, as shown in Figures 2 and 5.

This power device comprises a gear casing 31, including'lower and upper sections 32 and 33, respectively, as shown in Figure 6. The lower section 32 is suitably secured to a bracket 34 adjustably secured to a split collar 35, provided with a clamping bolt 36, whereby it maybe rigidly clamped to the supporting member'5, as shown in Figure 5. The collar has an extension 37 provided with threaded sockets 38 adapted to receive cap screws 39, traversing slots 41 provided in the bracket as shown in Figure 2. A

motor42 isaalso' secured to the bracket 34,

pinion 47'; is provided at the opposite end of tatably supported in the'sleeve 4 5 and meshes with afgearZLS connected with a pinion 49 bymeansof; a hub 51. The'gears 48 and49 and hub 51 are rotatably mounted "upon a stub shaft 52 non-rogear casing 31.

A gear wheel 54 meshes with the pinion-"49 and is secured to a flanged shaft 55,*having ing 31, asbest shown in Figure 8. Teeth 67 are cut in the periphery of the feed shaft 64; adjacent its lower end, adapted to mesh with a rack bar 68 secured to a sleeve 69,slidably, but non-rotatably mounted in a guide '71 provided in the gear casing 31, as shown in; Figures 6 and 7 The above .described' tr'ain of gears providesthe"means for feedin'gjthe boring bar longitudinallyduring operation of the apparatus.

The me'ansfor rotating the'boring bar-is best shownin Figures 2 and 3,]and com5 prises a shaft 72 rotatably mounted in abear an anti-friction bearing 7% provided in the gear wheel 54, as shown "in Figure3. The shaft 72 also traverses the sleeve and is adapted for relativeirotation with respect thereto. A clutch 76 is slidablybut nonrotatably mountedupon the shaft'72 between the pinion 47 and the gear wheel 5%, and-jis adapted to be selectively moved into' and out of driving engagement with-the clutch teeth 77'and '78 provided upon the pinion 47 and gear 54, respectively, as shownin Figure 3. A

yoke 79 is operatively connected with the clutch: 7 6 and hasan operating lever 10- cated'exteriorly of the casing and projecting forwardly from therebeneath, as shown in Figures 3 and 6, whereby it may be. 'con& venientlymanipulated byan operatorstatione d adjacent to'themachine. ,In Figure 3, the clutch 76 is shown inneutral position,

1 annularflange 92, as'shown in Figure 7." The A pinion 82'is terminally secured "to the] shaft? 2 and meshes with a gear 83 mounted whereby the shaft 7 2 will be" stationary upon a drive shaft 84 rotatably mounted in bearings 85 and 86 provided on the tubular guide 71, as shown in Figure 2.] The'gear 83 is 'non-rotatably connected withjthe shaft 18 by means of a suitablefeather key 87 secured to the boreof thegear and having a driving connection with the shaft8efby means of'a keyway 88. The driveshaft 84fhas enlarged portion 89rotatably mounted in thef sleeve 69 .and'retained therein bymeansfofj a collar 91, secured to thesha'ft 84, as shown] in "Figure 7. One end oftheHmarge'd-shaft portion 89'has an annular flange 92 adapted hubs 53' provided in the,

ing 73 secured to the tubular'guide'7 1, and;

to" oneend ofthesleeve 69 andwhich cooperates withthe collar 91 to prevent relative longitudinal movement of the sliaft'39;

with respect to. the sleeve 69."

The means for operativelyconneetingthe drive shaft 84: with the boringjbar'2 is best shown inFigures 7 and-9, 'and'comprise's a link-93 provid'ed'with terminalballs 94' and-95,

adapted to bereceived insockets 96 and "97, 7

respectively, as shown." The socket 96, it will be noted, is formed in the adjacent end of the j boring bar 2 and the socket97. is provided in the projecting portion 98fof the enlarged shaft portion 89 of the drive shaft84p, The exterior diameter ofthe projecting portion 98' correspond's to the diameter of .theadj a- 1 cent end of the boring bar 2;

TheballsQ and'95'are eachfprovided a drlve pin 99 adapted to be received in slots; 101 provided in the ends of the boring bar 2 andprojecting shaft portion .98. The halls are'retained in their respective, sockets means of suitable washers102 and split" re-' 'tainingrings1103, seated in annular grooves 10f provided'in' the walls of the sockets'96 and 97, asshown in Figure 9." The 1ink93, Y

balls '94 and 95, sockets 96' and 97,"and the, I drive pins 99, when operatively connected 7 provide, in efi'ect,'ia"universal'joint between theboring bar and the drive shaft.

The means providedfor'axially alining' the drive shaftwith the boring bar, consists.

of asleeve 105 slidably mounted upon the adjaoent'end of the boring bar 2, as shown 1n F1gure7. This sleevefis adapted to "be -fitt'ed.over the projecting portion 98 of the enlarged shaft portion 89 of the drive shaft 84. To aline' the drive shaft with. the boring bar, the power'deviceis' adjusted upon the supporting member 5 by means of" the split collar 35 and cap screws 39, securing the collar 35 to the bracket 34 as shown. in Figure 5. "Before the cap screws 36 and 39'are tightened, the drive shaft 84 is axially'alined' with the boring bar- 2 and the "alining "sleeve 105 longitudinally translated upon the" ing bar until it is moved into engagement with the 'p'rojecting portion 98 ofthe shaft 89, andthe end thereof abuts against the cap screws36 an'd39'may-then be tightened to rigidly secure the collar 35 to the supporting member 5, and the collar to the bracket 34, after which the machine is ready'for oper ation. 'It'is to be understoodthat, before connecting the boring'b ar t0 the power de 'vice,-the boring bar is: aimed with the-bearings to be rebored for, finished, and firmly supported in alinement-therewithbyameans Means" are provided for disengaging. theworm wheel 63 from the feed shaft 64 top er-H mit the drive shaft and boring barto be of thebrackets 1 8, as liereinbefore described; Q

; direct rotation therewith. mitted from the shaft 7 2 to the drive shaft Figure .8, and comprises a cap 106 secured to theupper reduced portion 107 of the fed shaft 64. This cap has a spring-actuated bolt 108 mounted therein, the lower end of which is adapted to be received in one of a plurality of sockets 109, provided in the adjacent face of the hub of the worm wheel 63. A finger grip-111 is secured to the upper end of the bolt 108 and has a depending lug 112 as the boring bar is rotated. When the finger grip is elevated to the dotted line position, shown in Figure 8 and rotated substantially ahalf revolution to cause the lug 112 to engage the upper face of the cap 106, the

- lower end of the bolt 108will be out of engagement with the sockets 109, thereby disengaging the feed shaft 64 from the worm wheel 63, and thus permitting the boring bar to be longitudinally moved by manually r0 tating the feed shaft 64.

In the operation of this apparatus, the supporting member 5 is mounted upon the lower face of the engine crank case, as shown in Figures 4 and 10, and the boring bar alined with the bearings as hereinbefore described. The boring bar is then operatively connected to the drive shaft 84, as shown in Figure 7, and the power device firmly secured to the supporting member 5. The proper tools 4 may then be inserted in the sockets 3 in the boring bar and the clutch 76 moved into engagement with one or the other of the clutches 77 or 78', depending upon the speed at which it is desired to retate the boring bar. If it is desired to. rotate the boring bar at a slow rate of speed, the

clutch 76 is moved into driving connection with the clutch teeth 78 and, on the other hand, if it is desired to rotate the boring bar at a relatively higher speed, the clutch is moved into driving connection with the. clutch teeth 77, thereby connecting the shaft 72 directly with the grooved pulley 44 for Power is trans- 84 through the gears 82 and 83.

The uprightfeed shaft 64 is adapted to rotate at a constant speed, regardless ofthe speed of rotation of the drive shaft 84. This will readily be understood as aresult of its connection with the pulley 44 thru the pinion 47, gear 48, pinion 49,-gear 54, pinion 56, gear 57, worm 62, and worm gear 63, the latter being adapted to be operatively connected with the feed shaft 64 by the spring-actuated bolt 108. V

The supporting member 5 provides an important feature of this invention in that it furnishes a rigid support for the boring bar 2. If necessary, several bridge members 6 may be employed, located between the brackets 18 supporting the-boring bar. The supporting member 5 is of large diameter, as shown, and one end .thereof overhangs one end of the apparatus, as shown in Figures 1 and 2, to provide a support for the power device which is mounted thereon. It will also benoted, by reference to Figure 1, that the power device constitutes a complete power unit, including the motor and the necessary mechanism for controlling the operation of the boring bar. The power device may be quickly detached from the apparatus by simply loosening the cap screws 36 and 39 and uncoupling the universal joint connecting the drive shaft with the boring bar. The cap 106 is preferably provided with a plurality of radial arms 113, whereby the feed shaft 64 may be manually rotated to longitudinally move the borin bar 2 during operation of the machine. finch manual operation of the boring bar may be conveniently accomplished when the bolt 108 is moved out of driving engagement with the sockets 109 in the hub of the worm gear 63. It will thus be seen that the apparatus is very flexible in operationand its construction is such that it may be utilized for boring practically all types and sizes of alined engine bearings.

The novel mounting of the boring bar upon the supporting member 5 permits universal adjustment of the boring bar whereby it may be axially alined with either the crank shaft or cam shaft bearings in the engine crank case, as shown by the full and dotted lines in Figure 10. It will also be noted, by reference to Figures 1 and 10, that the supporting member 5 is offset to one side of the longitudinal centerline of the crank case to provide iajmple clearance for adjusting the boring ar 2. c

The two speed drivesfor the boring'bar 2, provided byv the clutch teeth 77 and 78, and the clutch 76, provides means whereby the cutting tools 4 may be operated at a speed most suitable for the particular class of work to be performed. The sturdy construction of the boring bar supporting means also prevents chattering of the tools and, insures accuracy and high grade work, as well as increased production. I claim asfvmy invention: 1.. Ina portable machine for boring engine bearings, the combination of two or more bridge members adapted to be adjustablysecured to the engine frame, a split hub on each bridge 'member,a supporting member SeC11Ied, 1Il said hubs, brackets mounted on said supportlng member, a boring bar,

means mounted in said brackets and adapted to rotatably support said boring bar, anda variable speed power device mounted at one 7 end of said supporting member and having a unlversal driving 00111160131011 with s'aldboring bar, said power devlce also havmg means for automatically longitudinally feeding the boring bar.. V 7 g 2. In a portable machine for boring engine bearings, the combination of two or more bridge members adapted to be adjustably secured to the engine frame, a split hub on each bridge member, a supporting member secured in said hubs and having one end overhanglng the engine frame, brackets mounted on said supporting member, a borlng bar, means mounted 1n said brackets and adapted to ro-' tatably supportsaidboringbar, apower device demountably supported on the overhanging 7 end of said supporting member and having 'means for operating said boring bar, and 1 I means on sald power device operableto per-

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