US1295962A - Lapping-machine. - Google Patents

Description

H. BROWN.

LAPPJNG MACHINE.

APPLICATION FILED MAY 24. 1918.

2 SHEETS-SHEET I.

InferitEr H. BROWN.

LAPPING MACHINE.

APPLICATION FILED MAY 24. 1918.

Patentd Mar. 4,1919.

2 SHEETSSHEE[ 2.

, Inlfmm WV? hi srs raven onnion- HAROLD BROWN, OF MOLIN'E, ILLINOIS, ASSIGNOR T0 REYNOLDS ENGINEERING COMPANY, OF MOLINE, ILLINOIS, A

CORPORATION OF ILLINOIS.

LAPEING-MACHINE.

mosses.

Specification of Letters Patent.

Patented Mar. d, 1919..

Application filed May 24, 1918. Serial No. 236,269.

To all whom it may concern:

Be it known that I, HAROLD BROWN, a citizen of the United States, and a resident of Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in LappingMachines, of which the following. is a specification, reference being had to the accompanyin drawings.

his invention relates to an improved grinding or lapping machine, automatically grinding shaft and other hearings to their seats. It has been the common practice in securing an accurate fit between the'bearing brasses or bushings and their seats in connection with motor crank cases for a workman, after applying red lead or any other suitable medium tothesurfaces of a bushing and its seat and noting the points of contact, to scrape such places until a perfect fit is obtained. Such method is not only tedious but slow, and it is the object of my invention to provide means for rapidly and eifectively doing such work and domg it simultaneously in connection with a plurality of bearings. Briefly stated, I accomplish this object byproviding an oscillating arbor having means for properly en-.

gagingeach bushing and holding it forcibly ut yieldingly against its seat while the arbor is being oscillated, all as particularly described hereinafter. That which I believe to be new will be pointed out in the claims.

In the drawings:

Figure 1 is a front elevation of a machine embodying my improvements, aportion of a motor crank-case being shown in position on the bed of the machine, and the three bushings and their seats thatare shown be- 7 ing in section;

1g. 2 is an end elevation of the machine; Fig. 3 is a vertical section, enlarged, at

Fig. 4 is a detail, being a perspective view of one of-the devices carried bythe arbor for engaging the bushing while such bushing is being ground against its seat;

Fig. 5 is a detail, being a perspective view a showing a portion of the oscillating arbor with a flanged bushing-engaging device or holder in place on such arbor and in engagement with a flanged bushing such as shown at the'left-handend of thearbor in Fig. 1;

and

r Fig. 6 is a view similar to Fig. S but adapted for supporting, respectively, the head stock v16 and tail stock 17, which members 16 and 17 are adjustable up and down by the turning of the crank 18 and mechanism connected with the crank, which mechanism being Well understood it is not necessary to here illustrate or describe. The head stock carries the usual live shaft 19 and the tail stock the usual dead shaft 20, and between the pivot points of such two shafts is mounted an arbor 21, said arbor being made fast by a bracket or arm 22, as usual, to a head 23 secured upon the live shaft 152. Said shaft 19 instead of being continuously rotated as in the ordinary latheis given a rapid oscillatory motion which is effected through the medium ofan eccentric 24 mounted on a driving shaft 25 journaled in a rearward extension of the standard 14. To the eccentric is adjustably secured a connecting bar 25 which at its forward end is pivotally mounted upon a wrist pin 26 on the end of a crank 27 that is secured in any suitable manner, but preferably adjustably, upon the outer end ofthe live shaft 19. The drive shaft 25 is driven by any suitable means. Preferably a three-step cone pulley is secured upon the shaft as aportion of the driving means. a

The arbor 21 is provided with as many separate devices as there are bushings to be ground. Each of the devices for engaging a bushing consists of a member, the outer face the member 28, but, of course, if desired, al-

though I do not deem it necessary, such flanges may be of greater length. As shown, the inner face of the bushing-engagingfme1nber 28 is notsemi cylindrical like its outer face, but is provided with a number of angu larly disposed faces, the two side ones of which are parallel, such construction belng given to it to adapt it to fit upon and be held securely to the arbor, whiclnat the point where the holding device 28 is applied, is cut away to correspond. Thus it will be evident that when theholdingmember 28 is in place on the arbor it cannot have any independent movement with relation thereto eitherlongitudinallyor axially, asthe parallel-side walls formed on the arbor willprevent any tendency to axial movement and the shoulders formed'at theends of such-arbor-walls willhold the device against'endwise movement. I provide means, however, for posit vely securing the member28 to the 'arborand at tlie'sametime providefor regulating the degreeof pressure with whichthe device will force the bushing to its seat. Re-

ferring to these means,30 indicates a stem extending through the arbor midway, between the parallel straight sides that arecut in the-arbor, as clearly shown in'lli'gs. 5 and 6, which stem is screw-threaded into a hole extending centrally" through the bushing holding device'28, the head ofthe stembeing preferably countersunk in the arbor, as shown. 31' indicates a socket formed in the arbor around the stem, in which socket is located a coiledspring 32-tl1at bears against thehdlding member 28. With the arbor held in the machine in fixed position as in Fig.

1, it is evident that the pressure by. which the bearing is forced against its seat'can be regulated by the turning of the stem, and at the same time, by virtue of the spring arrangement, have such pressure a yielding one. The head-of the stem is notched to enable the desiredadjustment to be made by means of a screw driver or other similar tool, 33 indicates a portion of a motor crank-case and 34 are semi-cylindrlcal seats therein in each of which is adapted to rest a semi-cylindrical brass bushing 35.

In operation the device having the bushing or bearing seats-and which device has been herein referred to as amotor crank case is securedjin, place properly upon the bed of "themachine,jand'an arbor having bushingengaging members that correspond in location to the said seatsis then placed in po- 'sition onithe machine so that when lowered Ithe engaging members 28 will fitrinto their respectivebushingsthat have been placed in, the seats 34. --After'the arbor has been lowered by the usual manipulation of the mechanism connected with the head stock and tail'sto'ck, and the holding members 28 are snuglyfitted within the semibylindrical bushings power is appliedtothe shaft 25,

'lated by an adjustment of the connecting rod 25 WhileI have'described my invention with particular reference tothe grinding or lapping of crank case bearings for motors, it will be" found equally effective in" connection with semi-cylindrical or split bushings for other uses. Oi course, it will also be understood that different arborswill be required iordifierent pieces ofwork so that an arbor may be employed having the holding memberg 28= spaced the right distance apart to correspond to the bearing seats in the particular piece'of Workbeing done.

By the use of myinvention "much-time and labor. can be saved over theold'practiceof manually scrapmg down "s'emi cylmdrlcal bearings or bushings, for not only is: the work capable of being done more rapidly on each individual bushing, but as many bushings as may be desired may upon simultaneously.

VVhat I claim as my invention anddesire to secure by Letters'Patent', is-

1; In a machine of the class described, the combination with an arbor and meansfor oscillating it, of a device connected" there with for engaging a curved bearing member and rocking it in frictionalengagement with its seat.

2. In a machine of the class described, the combination with an arbor and means for be operated oscillating it, of a device connected therewith. for yieldingly' engaging a curved bearing member and rocking'it in frictionalfengagement with its seat. 7

3. In a machine of the class described, the combination with an arborgand means tor oscillatingit, of a device carriedthereby for bearing against the edgesbf a semi-cylindrical' bushing when said bushing i'sresting on its seat whereby said bushing will be ground against the seat during the oscillation of the arbor. V

e. In a machine of the :class described, the combination with an arbor, ot a device having a semi-cylindrical outer taceandop'positely-disposed lateral flanges for engaging respectively'the inner face and the'edges of a semi-cylindrical bushing when said bushf ingis resting on its seat, means for coning member movably seated against said side walls and having laterally-extending flanges for engaging the edges of a bushing when said bushing is on its seat, and means for oscillating the arbor to grind the bushing against said seat.

6. In a machine of the class described, the combination with an arbor having two opposite parallel side walls, of a bushing-engaging member movably seated against said side walls and having laterally-extending flanges for engaging the edges of a bushing when said bushing is on its seat, means for movably securing said bearingengaging member and the arbor together, a spring tending to force said member away from said arbor, and means for oscillating the arbor to grind the bushing against said seat.

7. In a machine of the class described, the combination with an arbor, of a bushingengaging member on said arbor, means for adjusting said member radially of the arbor. a s ring interposed between the arbor and sai member and tending to force said member outward, and means for oscillating the arbor and the said member.

HAROLD BROWN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 110."

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