US1345671A

US1345671A - Headstock-bearing for lathes

Info

Publication number: US1345671A
Application number: US261781A
Authority: US
Inventors: George E Greenleaf
Original assignee: NILES BEMENTPOND CO
Current assignee: NILES BEMENTPOND CO; NILES-BEMENTPOND Co
Priority date: 1918-11-09
Filing date: 1918-11-09
Publication date: 1920-07-06
Anticipated expiration: 1937-07-06

Description

G. E. GIIEENIEAF; HEADSTOCK BEARING `FOR LATIIES.

APPLICATION FILED NOV. 9, |918.

1,345,67 1 1 Patented fully @9, Imm.

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ti'rhltllt'rll E. GREENLEAJF, @F PLAINFJEELD, NEW JERSEY,

ll'l) COMPANY, OF NEW YURVJ. ll". Y., lli CRPRATIUN Ol NEW JERSEY.

HEADTClt-BEARlNGr FOR LI-lrllltlES.

Application tiled' Novenibs-:r 9, 191%.

To @ZZ fte/tom t may concern.'

Beit known that l, Gnoaen l. Gamin- Lnar, a citizen ofthe United States, residing' at llainiield, in the county of Union and @tate of llew Jersey, have invented certain new and useful Improvements in l-leadstocl-Bearings for Lathes, of which the following is a specification.

The object `of theinvention is to provide an improved bearingP for the inner end of the main work spindle of a lathe headstock whereby the spindle may be raised or lowered either for preliminary adjustment or to compensate for wear.`

ln the accompanying drawing, which shows the preferred embodiment of the invention,

Figure l is a front elevation, with parts broken away and shown in section, of a lathe headsto'clr having, a bearing1 embodying; my invention. y

Fig'. 2 is an end view of the hea-dstoclr. the face plate being removed and a part of the adjusting means'being shown in section. i

3 is a fragmentary view similar to lirn. 2 but showing the bearing' details on an enlarged scale.

i Referring to the drawing, the lathe headstock comprises lower and

upper frame tions

1 and 2 which arel secured together in any usual or preferred manner. The main worlr spindle is indicated at 3 and is arranged iMhorizontally. It is supported in two bearings t and 5 which are carried on the frame preferably on the lower section thereof. Also carried by the frame is suit able gearing' 6 for driving the spindle. .lts illustated7 the lathe is driven by an electric motor 7 which is connected with the lgearing; t5. Preferably the

frame sections

1 and 2 are so constructed as to constitute a cas iupf which incloses the major portions of the drive gearing and of the spindle 3. rlihe details of the drive gearing' and of the frame or easingF can be varied widely but that which lf have shown for 'purposes of illus tration is similar to that presented in the copending; 'application of George E tireenleaf' andhtililiiord li. Randolph for lathe l'ieadstocks, tierial No. 61,780g Eled liloveinbei' 9, 1918. i

The bearing 5 comprises upper and lower brasses 8 and 9 which directly engage the journal part of the spindle. rlhese brasses Specification of Letters Patent.

llatented duly tl, 122th serial no. serrer.

are mounted in a recess which is formed partly in the lower section l of the frame and partly in a cap 10 bolted to the lower section. lhe 'sides of the lower brass 9 are vertical and engage vertical guides formed at the sides of the bearing recess.

The bottom of the brass 9 is inclined at 11 and a wedge blo'clr v12 is interposed between the inclined bottom 11 of the brass and the horizontal bottom 13 of the recess. The frame section lis provided at the rear with a horizontal aperture 14C adjacent the rear end of the wedge block 12. 'llhe front or inner part of the aperture 111 is threaded at l5 arid a hollow bolt 16 tits the threaded part of the aperture and at its front end engages the rear end of the wedge block 12. it bolt 17 extends through the aperture in the bolt 16 and is threaded into an aperture in the wedge block 12.

By means of the two threaded bolts 1G and 17, the wedge block can be moved positively in either direction. lf the wedge block is to be moved toward the rear to raise the brass 9 both of the boltsI 16 and 17 are first loosened, the bolt 16 being turned only to a. slight extent. the enact amount of movement being' determined by the desired amount of movement of the 'wedge blockn lhen the bolt 1'? is turned in the other direc tion. rlhc head of the bolt 17 abuts against the head of the bolt 16 and thus enables the bolt 17 to positively draw the wedge bloclr 12 rearward until it engages the front end of the bolt 16. When the wedge block is to be moved toward the front, the bolt 17 is first loosened and then the bolt 16 is turned until the wedge bloclr has been moved. to the desired extent. After that the bolt 17 is tightened, thus locking' the wedge block in adjusted position. lt will be observed that after either adjustment the block is directly engaged by both bolts, being' thus firmly loclred in position. The two bolts engage each other and thus frictionally hold each other against turning.

l@il is supplied to the bearing through a hole 13 and oil is permitted to flow from the bearing; through a hole 19 in the bottom brass 9. 'lhe hole 19 registers with a hole in the wedge block 12, this hole 2O being,V elongated to permit movement of the block without moving; the hole out of register. From the hble 20 the oil discharges into a drain passage 21.

The adjusting means that I have described can be used at the initial construction or Yassembling of the lathe to properly aline the work spindle, Its principal usefulness, however, is to compensate Jfor the wear which occurs after the lathe has been used. 'Vhen heavy pieces of work are turned, considerable weight is thrown on the bearing 5 with the result that the lower brass thereof wears relatively rapidly. Even a small amount of wear will throw the spindle out of alinement and thus interfere with the accuracy of the lathe. lVith a lathe headstock embodying my invention the inner spindle bearing can be taken up from time to time as wear takes place, the spindle being thus maintained in correct alinement at all times.

Vhat I claim is:

l. In a lathe headstock, the combination of a box-like frame, a horizontal work spindle, drive gearing for the spindle inclosed within the frame, bearings provided at the respective ends of the frame, the work spindle being mounted in such bearings, passing through the frame and projecting outside thereof at one end, a lathe face plate mounted on such projecting end7 the bearing adjacent the face plate including an upper brass and a lower brass provided with a plane wedge-engaging bottom, a wedge block under the lower brass and engaging the bottom thereof, and screw means engaging the wedge block and extending through the frame to the outside whereby the wedge block may be vpositively moved in either direction to raise or lower the work spindle and face plate to compensate for wear.

2. In a lathe headsteck, the combination of a box-like frame, a horizontal work spindle, drive gearing for the spindle inclosed within the frame, bearings provided at the respective ends of the frame, the work spindle being mounted in such bearings,

passing through the frame and projecting outside thereof at one end, a lathe face plate mounted on such projecting end, the bearing adjacent the face plate including an upper brass and a lower brass each provided with a hole therein for the passage ol' the bearing lubricant therethrough and the lower brass being provided with a plane wedge-engaging bottom, a wedge block cngaging the bottom of the lower brass and provided with an elongated hole registering with the hole in the lower brass whereby the bearing lubricant is drained from the bearing, and screw means engaging the wedge block and extending through thi` frame to the outside whereby the wedge block may be moved in either direction to raise or lower the work spindle and face plate to compensate for wear.

3. In a lathe headstock, the combination of a frame comprising an upper section and a. lower section, a, horizontal work spindle, drive gearing for the spindle inclosed within the frame, bearings provided at the rcspective ends of the frame and supported on the lower section independenti).v of the upper section, the work spindle being mounted in such bearings, passing through the frame and projecting outside thereof at one end, a lathe face plate mounted on such projecting end, the bearing adjacent the face plate including an upper brass and a lower brass, a wedge blockunder the lower brass and engaging the bottom thereof, and screw means engaging the wedge block and extending through the frame to the outside whereb)7 the wedge block may be moved in either direction to raise or lower the work spindle and face plate to compensate fior wear.

In testimony whereof I hereto ailix my signature.

GEORGE E. GREENLEAF.