US131733A - Improvement in milling-machines - Google Patents

Description

A.HI.BRA1NARD. Improvement in Milling-M-alchines. NO.. 131,733. l Patented Oct. t, 1872.

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` A. H. BRAINARD. Improvement in Milling-Machines.V N\o.131,733.

Patented Oct. l, 1872.

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Improvement in Milling-Machines. No.. 13l,733.]` V Patented 0t.1,1872`.

State of Massachusetts, have invented certain outer end of the mill-spindle5 also in the ar- 5, and spindle a at all times, as described.

' ever they occur on the drawing.

L Vtion of the machineyFig. 2 is a central longithe pinion e, as shown.

`arrangement of back-gearing on lathes and Anos vn. Balmain), or HYDE rknk, nksskcnfusnrrs.

` a IMPROVEMENTIN Mauna-MACHINES.

Specification forming part of Letters Pate To all whont it may concern:

Be it known that I, AMos H. BRAINARD, of Hyde Park, *in the county of Norfolk and new and useful Improvements on Milling-Machines, of which the. following is a specification:

N more and Ubjects of the Invention.

The nature of my invention relates to improvementson milling-machines, which consist in the arrangement of certain mechanism making an` adjustable central support for the rangement of mechanism for supporting and disengaging the worm from the worm-wheel, as described; also in the arrangement of mechanism that permits the table to be raised Yor lowered, `and still connect the feed-screw 16, shaft Similar letters refer to similarv parts wher- On the drawing, Figure l is a front elevatudinal section over the line A B. taken on Fig.l; Fig. 3 is a rear view; Fig. 4 is an enlarged end view of the support for the millspindle, `and Fig. 5 is a central longitudinal section over the line G D taken on Fig. 4; Fig. 6 is a ground plan of the nut for the horizontal feed, and Fig. 7 is a section over the line E Ftaken on Fig. 6; Fig. 8 iis a side view of the horizontal feed-shaft, and Fig. 9 is central longitudinal section over the bearings taken on Fig. 8. y

a on Fig. 2 is ahollow spindle, movable `in bearingsb b attached to the standard c. Around the hollow spindle a is the movable cone-pulley d; to the cone-pulley d is firmly attached On. the hollow spin dle ais firmly keyed the spur-wheel j', that is made to engage with the pinion g, Fig. l, movable around the Vback-gear shaft h. The pinion c is made to engage with the spur-wheel t', that y is also `movable with the pinion g around the shaft hinthe'manner similar to the drilling-machines. f The wheels g t' may be disengaged from the wheelscf when great speed is required for thespindle a, in which instance the wheel f has to be coupled to the cone-pulley d in the usual way. The forward end of the hollow spindle a is conical on the outside, and

nt No. 131,733, dated octber 1,1812.

thebearing for it is made correspondingly, and

provided with two check-nuts, k k,in each end, as shown, whereby the slack may be taken up as the spindle'a wears in its bearings. .The extreme forward end of the spindle a is made with an external screw-thread, over which a chuck or face plate may be screwed, as may be needed, for certain kinds of work. 'lhe milllspindle Z is driven in the tapering hole in the forward end ofthe hollow shaft a, and the mill m may be secured thereto in any suitable way; but to prevent the chatteringfof the mill-spindle l I provide a support, n, clamped over the circular part o of the supporting aarched frame p, as shown. The archedframe p is bolted on the upper side of the bearings b b, by which arrangement I obtain a strong brace for the bearings b b, whereby the machine is made to operate steadier, without chattering. The support n is shown in enlarged scale in Figs. 4 and 5. The upper part of this support is a circular split ring provided with ears g g, that can be clamped together by thescrew fr going through one of the ears freely and screwed in the other ear, as shown in Fig@ 4. Through the lower end of the sup-` port n is the adjustable piece s, inserted as shown, and situated in an oblong opening,

which has Vertical sides ruiming parallel. The piece s has in one end acollar, and over the other end is the `nut t screwed, whereby the piece s can be held firmly in place after it is onceadjusted. The whole of the pieces is tapped through, and a center-bolt, n, screwed through it, as shown. The bolt n is provided with a head in the extreme outer end,and has a Vcheck-nut, e, attached, whereby it .can be held firmly in place where desired. The piece s, with the center-bolt n, can be adjusted up or down by means of the set-screw w and the coiled spring x lying in the support n, `as shown, or the coiled spring and set-screw may be dispensed with and the piece s adjusted by l Figs. 2 and 3. The train of gears y, z, and 1 are supported in bearings in the arm 3, the upper end of which is slipped over the hollow spindle a, as shown. Acone-pulley, 4, is keyed on the shaft 2 for the purpose of conducting the motion to the feed-shaft 5, on which a similar cone-pulley, 6, is keyed, as shown in detail in Figs. 8 and 9. A groove, 7, is cut lengthwise on the shaft 5, and a corresponding key fixed in the worm 8, by which arrangement the worm 8 can be moved out or in on the shaft 5 and still be attached to the said shaft. The worm 8 is movable in a bearing, 9, and to prevent the worm from slipping out of the bearing 9 I provide it with a iiange, 1() 10, on each side of the bearing 9, as shown in Fig. 9. The bearing 9 is provided with a projection, 11, that rests on a hooked finger, 12, (Fig. 1,) and the bearing 9 is also made to swing around a bolt, 13, attached to the carriage 14. The worm 8 engages with the worm-wheel 15 attached to the feed-screw 16, as shown. The object of the projection 11 on the bearing 9 and the hooked finger 12 is so as to readily disen gage the worm 8 from the worm-wheel 15, when it is desired to feed the screw16 byhand instead of automatically by power. For the purpose of disengaging the worm 8 from the worm-wheel 15 I remove the hold of the finger 12 on the proj ection 11 either by hand or automatically by means of the dog 17 attached to the table 18, when the outer end of the shaft 5 drops down far enough to prevent the worm 8 from engagement with the worm-wheel 15. ,For

this purpose I have also arranged the rear bearing 19, which supports the shaft 5, so as to turn around with the bolt 20, which projects through the bracket 21, as shown. The hooked inger 12 is held in place by means of the spring 22, or equivalent, as shown in Fig. 1. The shafts 2 and`5 are connected together by means of the brace 23 and 24, provided with an eye in each end, through which the shafts pass, as shown in Fig. 3. The end of the brace 24 is bored out, so as to receive the cylindrical end of the brace 23, and they are attached firmly together by means of the setscrews 25, as shown. The object of this arrangement is to tighten and take up the slack of the belt 26 as it is stretched by the operation of the machine. The carriage 14 is movable in and out in a horizontal direction over V-guides attached to the supporting-bracket 27, and operated by means of the screw 28 and nut 29, as shown in Fig. 2. The supporting-bracket 27 is movable up and down in a vertical direction over V-guides attached to the standard c, and raised or lowered by means of the screw 30 operated by the bevel-gears 3l 32 and shaft 33, to which a portable crank is secured during operation. The upper side of the carriage 14 is also provided with V- guides, in which the table 18 is made to slide forward and back. The table 18 is provided all round with a groove, 34, in which the waste oil can be collected and drawn off into a suitable vessel, so as to be used over again. Under the table 18 is the nut 35 36, made in two halves, attached to the table by means of the two screws 37 37, in the manner shown in Figs. 6 and 7. Through the table 18 holes are bored and tapped for the screws 38 38 38 38, that are screwed through the table 18 and made to press against the upper side of the nut 35. Through the half nut 36 holes are bored and tapped for the screws 39 39 39 39, that are screwed through the nut 36 and press against the under side of the nut 35, as shown in Fig. 7. The object of the bolts 37 38 39 is to keep the nut 35 36 central with the screw 16, and to hold the two parts of the nut rigidly apart as far as needed for the free and easy motion of the feed-screw 16, and also to admit of adjustment as the thread of the screw wears. The upper part of the table 18 is cut through with T-headed grooves going at right angles to each other, wherein bolts may be slipped for the purpose of holding the work firmly on the table 18 during the operation of my machine.

The operation of my machine is as follows: After the work is firmly attached on the table 18 and a suitable mill, m, attached to the millspindle Z, and the said spindle lgiven a rotary motion, I move the work up or down, out or in, or sidewise, as may be required according to the nature of the work that is to be done, the respective movements of the carriage 14 being executed by means of the different parts hereinabove described, and in the manner as shown on the drawing.

Having thus fully described the nature, construction, and operation of my invention, what I wish to secure by Letters Patent, and claim, is-

1. In combination with the adjustable center-rest n, the adjustable head s, screwed center-pin u, check-nut c, and set-screw w, when all are arranged and combined as and for the purpose herein set forth and described.

2. rI"he arrangement for supporting and disengaging the worm 8 from the worm-wheel 15, consisting in the pivoted bearing 9, provided with the projection 11, hooked finger 12, spring 22, dog 17, and pivoted bearing 19, in a manner and for the purpose set forth.

3. In combination with the spindle a, the pivoted arm 3, gears y z 1, or their equivalents, pin 2, pulleys 4 and 6, adjustable connection 23 and 24, feed-shaft 5, feed-screw 16, and the table 18, as and for the purpose set forth.

4. In combination with the feed-screw 16 and its divided nut 35 and 36, the arrangement of the adjusting- screws 37, 38, and 39, by which the nut 35 36 can be adjusted centrally with the feed-screw 16, in a manner as herein set forth.

AMOS H. BRAINARD.

yWitnesses:

WM. H. HUrcHINsoN, ALBAN ANDREN.

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