US1751214A

US1751214A - Brass-truing machine

Info

Publication number: US1751214A
Application number: US120550A
Authority: US
Inventors: Edward J Mckernan
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-07-06
Filing date: 1926-07-06
Publication date: 1930-03-18
Anticipated expiration: 1947-03-18

Description

March 18, 1930.

BRASS TRUING MACHINE Filed July 1926 2 Sheets-Sheet l E. JQ MGKERNAN .1,751,214

March 18, 1930. E. J. MCKERNAN .y 1,751,214

l BRA'SS TRUING MACHINE Filed July 6, 1926 2 Sheets-Sheet 2 Patented Mar. 18, 193071l EDWARDJ. MCK'ERNAN, 0F TOPEKA, KANSAS' BRASS-TRUING MACHINE Application filed July 65 1926. Serial No. 120,550.

My invention relates to a machine more es-V pecially intended for machining and truing the bearing surface of car brasses employed in the journal. bearings of railroad cars.

6 The invention has for its object the pro vision of a portable hand operated machine constructed to` accommodate any size of car brass at present in use; the invention contemplating means whereby the brass is securely held in place on thechuck of the machine and given a true radius, and true, even bearing surface disposed square with the back or non-wearing face of the brass.`

The objects and advantages of myl inven- '15 tion willibe more readily ccmprehended from the detailedy 'description of ing drawings, wherein- Figure 1 is a side elevation of my improved machine.

2 0 Figure 2 is a plan view thereof with a por. tion of the arbor broken away and-shown in section.

Figure 3 is a detail vertical sectional View taken on the-offset line 3-3 of Figure L look- 2 5 ing in the directionof thearrows.

' Figure 4 is a detail view taken substantially on the line 4-44 of Figure-l illustrating a portion of the drive* and driven elements.

Figure 5.is a 'detail sectional viewv of the operating mechanism at the right handv end ofthe arbor and feed screw asillustrated in Figure l. l Figure 6 is a detail perspective viewy of a feed-nut. f In' theparticular exemplifcation of the invention, the machineconsists of the two end castings or' standards 10, 1I connected together by the longitudinal' frame members 12', 124 which. in turn provide suitable support for a chuck-'box indicated general-ly' at13", the upper out-turned' ends whereof... are secured to` theframe members-12 by means of bolts 14. The chuck-box is provided with an ad justing wedge plate or mem-ber l, a liner 16 and av chuck proper or block 117;. the latter being provided with the stepped holdingsu-ri faces'flfSi, assshown'invFigureS. i

` The 'liner 11G-andthe chuck'17 areproperly alined inthef-chuckebox l'3byfmeaaisof a suitable.1 bracketroi`vstrap'- 19 which extends about the accompanyone end of the chuck-box and is properly secured thereto as for example by bolts20, see Figures 1 and 2.

At the opposite end of the chuckeboX, I provide a bracket 21 which actsvas asupport for an adjusting screw 22 which is threaded into vadjusting wedge 15; the bracket 21 also acts as a stop so that rotation of the, screw 22, by means of hand-wheel 23, will causethewedge plate 15 to travellengthwise of the screw; longitudinal movement of the*` screw being prevented by bracket 21. As is apparent from the construction shown, inward or outward movement of the wedge plate 1 5 will either cause the chuck block 17 to be raised or loewered and thus determine or control the relation of the brass operated on tothe cutting mechanism later to be described. Y

After the brass (indicated: in dotted lines at A in Figure 3) has vbeen placed onV the stepped surface 18 of the` chuck 17 (the stepped surface being made to accommodate thechuck to varying sized brasses) the bra-ss is then clamped in place on the chuck yby means yof the hook members 24, .24' which are adapted to engage with opposite sides of the brass. The lower ends of. the hook members 24 are secured to a clevis 25 located tr-ansversely beneath the chuck-box and which in turn is provided with a clamp screw 26 provided with handle 27; the clamp screw 26 abutting against the bottom of` the` chuckboX v13. It is evident that upon proper rotation of screw 26 through vthe .medium of handle 27 the hooks 24,724 through themedium of clevis 25 willy be drawn downwardly with the upper ends of vthefhooks in firm whereof are preferably provided with 'suit- 'n able bushings 29. The arbor extends from end to end' lof the machine `in verticalaligI-rment `with `the longitudinal.- centerl ofjl the chuck, f see, Figure 3. The., tops of! 'the Standards-10am1l.areiShQwn-nordedewith l ico,

oil receiving apertures 30, for properly lubricating the arbor. The arbor 28 is provided with a machined slot at 31, extending lengthwise of the arbor, in which a feed screw 32 is located and disposed lengthwise of the Vmachine; the screw 32 extending through opposite ends thereof as shown in Figure l. The arbor bearing at the end ofthe machine Y provided with-pedestal or supporting frame ll is supported by means of an arbor bearing portion 33 formed to slide axially intoplace and to be secured to the supporting standard ll by means of suitable bolts as at 34. lVi'th this construction, it is apparenttljiateasy as-V4 sembly of the parts may be had and at the same time replacement and substitution of the cutter-head shown at 35 is readily permitted. Vhen it is desired to changelthe cutters, the cutter-head'35 (having cutting tools 35a) is moved along the arbor by means of feed-screw 32, until the cutter-headpractically reaches the arbor bearing 33.v The end of the feed screw 32, adjacent to arbor bearing 33, is provided with a bearing 36 and with a hand- `crank-37 whereby independent rotation of feed-screw 32 may be induced and the cutterhead 35 caused to travel in the manner stated. The bolts 34, which hold the arbor bearing 33 in place on'the out-board bearing casting or standard 11, are then removed, thus allowing the arbor bearing 33 to slide axially olf arbor 28. The cutter-head or tool holding mechanism 35 may then be removed from the arbor 28 by turning a feed disc 38 located at the right hand end of the arbor.

The cutter-head 35 is provided with a feedl nut 39, shown in detail Y*in Figure 6. YThe V'cutter-head with the-feed-nut placed on. the end of the arbor 28 and feed-screw 32 andthe operations heretofore lmentioned in connection with the removal of thefcutter-head are lthen reversed for thefpurpose otre-assembly.

The feed-screw 32 is supporte-d inthe machined slotdisposedlengthwise of ,arborl 2,8 Vby means Vof two disc bearings, disc bearing 36 anda disc bearing 41'at the opposite end. The disc bearing 36 is secured to one/fend of the arbor 28 for vexampleby means ofco'unterysunk head machine screws, not shown; while bearing V41 is preferably Vmade somewhat in the form of a cup-,- threaded on. the' cupped side to screw onto the end' o-arbor 28 and held-fromturning by means ofa screw 41a. Y-

y VPower isfim'parted to the arbor 2 8, in theV particular vexemplication of my invention, Vby

hand-crank 42 secured to a driving gear 43 which latter meshes with a driven gear 44, which latter is secured or keyed to one end of arbor 28. The driving gear 43 rotates on a stub-shaft 45 suitably mounted in the'supporting standard 10.

` The feed disc 38 keyed or properly secured Y to the end of feed-screw 32 against independent rotation is provided with a plurality ofv notches disposed `circumferentially equi-distances apart about the periphery of the disc vas shown at 46 in Figure 4. These notches are adapted'to receive the hook-end 47 of a feed spring48 which is stationarily secured to the end casting or standard 10 in any suitable manner as for example by the bracket 49.

The feed spring 48 is intended to successively enter or engage a notch 46`during each revolution of arbor 28 and thereby induce the,

feed-nut 39 with thecutter-head 35. to move a predetermined distance along the arbor 28 and position the cutter-head relative yto the arcuate surface of the brass so as to induce a cut to be made over the entire ournal bearing face of the car brass.V The feed spring 48 induces a predetermined degree of rotation of the feed-screw 32 during the successive engagements in the notches 46.y

After thecutter-head has moved from one Yend of the car brass to the other, the mechal Y nism maybe reversed so as to bring the cutter-head toward the gear endofthe machine by operation of theVhand-.crank 37 (at the out-board end l1 lofthe machine) secured to Y the feed-screw 32. Through operation ofthe hand-crank 37, the'cutter-block 35 with its cutting tools 35a is repositioned without necessitating a reverse operation of the gear mechanismjthe operation of the feed-screw by means ofVhand-crank 37 inducing a faster return Vof the cutter' mechanism toward the gear side of the machine withoutnecessitating rotation ofthe cutter block. The ability to return the cutter-headin this manner eliminates any possibility' of wear on the cutting tools and therefore at the same time avoids chatter marks being made on the car brass. The ystandardslO, ll areV shown secured to iio 'k'or mounted on` Ya. suitable platform or--base 50, thus enabling the machine to be placed in any desired position, or placedfon a small Y hand-truck to be transported'about the shop or moved to the place of'use.y 3

The machine as illustrated has proven very etlicient in practice,but modications in certain respectsare possible and maybe made without, however, departing Yfrom the spirit of my invention. L

What'I claim is: Y 1 l. Ina brass truingmachine, a chuck box having upstanding sides whereby the boxmay be secured to a supporting member, saidside vwalls having vertical slot-ways, the.l ends of the chuck box being open, a chuck block., the lower .surface thereof is ,tapered7 asimilarly 'izo tapered wedge block slidable on the bottom of said boX and beneath the chuck block, said wedge block having a threaded` bore eX- tending longitudinally from one end of the wedge block, a bracket disposed about one ofthe open ends of the chuck boX for preventing lengthwise movement of the chuck block, an adjusting screw extending into the threaded bore of the wedge block, a second bracketdisposed at the same end of the chuck box and through which the adjusting screw eX- tends whereby lengthwise movement of the screw is prevented, a pair of upstanding arms disposed in the slots in the sides of the chuck box, having inwardly disposed upper ends above the chuck box, a transversely disposed member beneath the chuck box pivotally connected at its ends to the lower ends of the arms whereby both arms are operativelyconnected together, and a clamp screw threaded through said last member and engaging the bottom of the chuck boX whereby screwing of the clamp screw causes said transversely disposed member to ride lengthwise of the clamp screw and both arms simultaneously moved together.

2. In a brass truing machine, an open ended chuck boX having two side walls with vertical slots and terminating at top in supporting flanges, a chuck block provided with a depression on its upper surface having stepped sides to receive brasses of different size, the lower surface of the chuck block being tapered, a tapered wedge block disposed throughout the'bottom of the boX andV slidable beneath the 'chuck block, means secured to one end of the chuck boX whereby lengthwise movement of the wedge block may be induced and its position maintained, a pair of hook members arranged on opposite sides in the slots of the chuck boX with their upper hook ends disposed inwardly to engage the upper sides of the brass, a clevis pivotally secured to the lower ends of both hook member, and a clamp screw threaded through the clevis and adapted to engage with the bottom of the chuck box whereby said hook members are drawn downwardly into clamping relation with the brass.

EDWARD J. MCKERNAN.