US570723A - Milling-machine - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

0; E. VAN NORMAN.- MILLING MACHINE.

No.570,723. PatentedNov.3,1896.

Whaling I Inventor.

Jag,

(No Model.) v 1 2 snkheei 2. G. E. VAN NORMAN.

MILLING MACHINE. No. 570,723. Patented'Nov. 3,1896.

Whit? rm; mains Pzrzns ca. mom-Luna, WASHINGTON u c bevel-gear on the cutter-shaft.

UNITED STATES PATENT OFFICE.

CHARLES E. VAN NORMAN, OF SPRINGFIELD, MASSACHUSETTS.

MILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 570,723, dated November. 3, 1896. 7 Application filed November 13, 1895. Serial No. 568,783. (No model.)

pivotally-hung tool-carrying head adjustable in a vertical plane to any degree of a circle havlng for a center the pivot on whichsaid head turns; and the invention consists more particularly in the construction of the driv-' ing mechanism for the milling tool or cutter, whereby the latter is positit'ely driven by means of shafts having suitable gear connections with each other, said connections being attached to and adapted to move with the horizontally-sliding head to which the toolcarrying head is attached. 7 1

In the drawings forming part of this specification, Figure 1 is 'a side elevation of a milling-machine embodying my invention and showing the main driving-shaft onthe side of the sliding head of the machine and the bevel-gear connection with the shaft across the end of the said head and also showing a portion of the outline of the swiveled cuttinghead in dotted lines. Fig. 2 shows a front elevation of the swiveled cutter-head and in dotted lines the bevel-gear engaging with the Fig. 3 is an end view of the sliding head of the millingmachine and driving connections with the swiveled cutter-head swung to a horizontal position, said head being shown in section. Fig. 4 is a plan view of the sliding head, showing all the driving connections attached thereto and showing the cutter-head in a horizontal position. Fig. 5 shows a modified construction of the driving mechanism.

Referring to the drawings, A represents the base of a milling-machine of the usual construction, having the usual planer-feeding devices for the vertically-adjustable bed B, to which the work is secured, and the usual horizontally-adjustable head 0.

On the frame of the machine is cast the bracket E, having two arms which serve as journal-bearings for the shaft D. On said shaft and between the arms of said bracket E is the driving cone-pulley F, fitting loosely said gear having a bearing against one side of the arm G, and a collar on the other side of the arm G, also fixed on said shaft, provides means whereby the shaft D is carried by the head O when the latter is moved horizontally,said shaft when said movement takes place sliding freely in the bearings of the bracket E and through the cone-pulley F.

Across the end of the head 0, in suitable bearings E, is hung a shaft D, having thereon at one 'end a bevel-gear l-I, meshing with gear H on the shaft D, and on the other end thereof another bevel-gear H both fixed on said shaft One end of said shaft D, with the gear H thereon, projects through the side of the head 0 at a, Fig. 3, and into a chamber I), provided in the body of the swiveled cutterhead K. On said cutter-head K two journalbearings L are cast, in which the shaft cl runs. Said shaft is provided with the usual tapered socket for the reception of the similarly-tapered shanks of the various tools used on the machine, a fluted cutter being.shown in position in Figs. 2 and at.

Between the bearings L is the beveled gear H fixed on the shaft d and adapted to en gage with the bevel-gear H through an opening made from the front of the head K into said chamber 1), said gear 11 being, as before stated, fixed on shaft D. Thus power is directly applied to the cutter through the medium of the gears H H H H and shafts D and D.

Referring to Fig. 3, it will be seen that on the back side of the cutter-head K is turned -a ring T, projecting somewhat from the surtrunnion on which the said head may turn, and an annular socket to receive said projecting ring is turned in the face of the head 0, both ring and socket being concentric with the center of shaft D, carrying gear H which projects into the chamber 1) in said cutterhead.

In the side of the head 0, to which the swiveled cutter-head K is attached, are the slots M and M, made concentric with center of shaft D, which is the center of rotation of the head K. Bolts f, passing through said slots and head, serve to secure the latter in any position to which it is desirable to adjust it.

It will be seen that as the center of gear II is coincident with the center of the trunnion T, on which the head K turns, that in whatsoever position said head may be turned to the gears H and H are always connected,and con sequently the same positive driving power is applied to the shaft cl, carrying the cutter or milling-tool, whether said cutter-head occu pies a vertical or horizontal position or any point of the circle therebetween, the gear H always revolving about the periphery of the gear H and receivingpower therefrom. The cutting-tool on the end of shaft (Z is capable of adjustment in line with said shaft by means of hand-wheel d in the manner usually employed in such constructions, as, for example, the adjustment of the spindles in a lathe.

The advantages of this construction and application to milling-machines of the class to which this invention belongs (of a positive driving mechanism for the milling-tool) are obvious, the tool shaft in such machines having been heretofore commonly driven by a belt, which with each change of position of the swivel-head relative to the frame necessitated the loosening or tightening of the driving-belt by means of an idler, entailing thereby loss of time and a consequent diminution of efficiency, and besides not affording the same powerful means of driving the cut ting-tool as is obtained by the use of this invention.

It is obvious that wherea machine is to be always employed on any class of work which would not necessitate a great degree of movement of the horizontally-sliding head 0 the gear 11 could be replaced by a, driving-pulley, which would be belted directly to a countershaft, and all of the parts carried by the shaft D could be dispensed with, as well as shaft D also, without departing from this invention, the most important feature of which is the construction of swivel-head having the driving-gear for the tool-shaft therein, which gear is adapted to rotate about a central point which is coincident with the center of the shaft from which power is transmitted to said gear in the swiveled head.

Having thus described my invention, what I claim, and desire to secure by Letters Pat cut, is-

1. In a milling-machine, a main head horizontally adjustable on the machine, an auxiliary head attached for rotatable adjustment to the side of said main head, a tool-carrying spindle supported to rotate in said auxiliary head, a shaft supported in said main head at right angles to said spindle, gear connections between said spindle and shaft, combined with a driving-shaft moving horizontally with said main head, and a driving-pulley on said shaft supported on the base of the machine, substantially as set forth.

2. In a milling-machine, a main head hori zontally adjustable on the machine, an auxiliaryhead attached for rotatable adjustment to the side of said main head, a tool-carrying spindle supported to rotate in said auxiliary head, a shaft supported in said main head at right angles to said spindle, gear connections between said spindle and shaft, combined with a second driving-shaft D, supported in v bearings fixed to the base A, of the machine, having geared connection with the shaft in said main head, a driving-pulley on said shaft D, having a spline-and-groove connection therewith, and an arm on said main head engaging said driving-shaft D, whereby the latter and said main head have coinciding-herb zontal movements, substantially as set forth.

3; In a milling-machine, a main head horizontally adjustable on the machine, an vauxiliary head attached for rotatable adjustment to the side of the main head in a plane at right angles to the movement of the workholding table and parallel with the movement of the main head to which it is attached,

a tool-carrying spindle supported to rotate in said auxiliary head, a shaft supported in said main head at right angles to said spindle, and extending through the side wall on which the auxiliary head is pivoted, gear connections between said shaft and spindle combined with driving mechanism for rotating said shaft, substantially as described.

4. A main horizontally-adjustable head provided with avertical wall upon one side, and suitable bearingsin or upon its front end for the driving-shaft for the tool-spindle, combined with a rotatable head pivoted upon the said vertical wall, means for securing the rotatable head in place, the driving-shaft for the tool-spindle jou-rnaled upon the front end of the main head and having one end extend through both the vertical wall and the rotatable head and provided with a gear, and a tool-carrying spindle mounted upon the rotatable head and provided with a gear to engage with the one on the end of the drivingshaft, substantially as shown.

5. In a milling-machine, a base, a table for the work vertically adjustable thereon, and a horizontally adjustable main head placed upon the top of the base, and provided with a slotted vertical wall, upon one side, and suitable bearings upon its front end for the driving-shaft for the spindle, combined with driving-shaft D, having one of its ends prothe driving-shaft; the pivot of the rotatable I ject through both the side Wall and the rotahead being formed around the end of the table head and provided with a gear; the rodriving-shaft, substantially as described.

tatable head pivoted on the outer side of the CHARLES E. VAN NORMAN. 5 vertical wall and provided with means to hold \Vitnesses:

it in position; and the spindle provided with H. A. OHAPIN,

a gear to engage with the one on the end of WVM. H. OHAPIN.

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