US2372913A

US2372913A - Internal and external milling

Info

Publication number: US2372913A
Authority: US
Publication date: 1945-04-03
Anticipated expiration: 1962-04-03

Description

nus-1m:

R 2 3720913 0 2 s I W W P 1945. J. M. SCHMIDT 2,372,913

' INTERNAL AND EXTERNAL MILLING ATTACHMENT Filed May 14, 1943 3 Sheets-Sheet l i, EN I in w a Q I I a I a a m Inventor r Jmes/II-Sehmadt WWW 25 a I E"- (f AND PLANINGY 1 1 April 3, 1945. J, M. SCHMIDT INTERNAL AND EXTERNAL MILLING ATTACHMENT Filed lay 14, 1945 3 Sheets-Sheet 2 Inventor fines MSakwidZ B) up/W M AN D PLAN 3 NS,

' DDUERJH HUL" April 3, 1945. J. M. SCHMIDT 2,372,913

INTERNAL AND EXTERNAL MILLING ATTACHMENT Filed lay 14, 1943 s Sheets-Sheet s Inventar Java. 42

Q4... @6101. WWW fiMg AND PLANING,

Patented Apr. 3, 1945 Search R001 INTERNAL AND EXTERNAL MILLING ATTACHMENT James M. Schmidt, Philadelphia, Pa.

Application May 14, 1943, Serial No. 487,013

1 Claim.

The present invention relates to new and useful improvements in milling attachments and the principal object of the invention is to provide an internal and external milling attachment for making keyways and the like and to face light work.

Another important object of the invention is to provide a milling attachment which can be readily attached to any machine that has a rotating spindle such as horizontal boring mills, lathes, and drill presses.

An important object of the present invention when associated with one of the machines above named is the advantage of direct alignment with the taiistock, thus eliminating the change for error in set up and operation, this is especially true when the device is used on lathes or horizontal boring mills.

Other objects and advantages of the invention will become apparent to the reader of the following description.

In the drawings:

Figure 1 represents a fragmentary side elevational view showing the appliance acting on a piece of work, the latter being shown in section.

Figure 2 is a top plan view of the attachment.

Figure 3 is a section on the line 33 of Figure 5.

Figure 4 is a fragmentary bottom plan view of the attachment.

Figure 5 is a fragmentary longitudinal sectional view.

Figure 6 is a cross section on the ine 6-6 of Figure 1.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 denotes a tailstock through which a bar 6 is sliclable and splined to the tailstock 5 is the bar 6 having a groove 1 therein for receiving 9. lug (not shown) in the tailstock.

A tapered shank 8 projects from the bar 6 and on to this is adapted to be wedged, a tapered socket 9 projecting from one end of the attachment III which makes up the present invention.

Numeral H denotes a boring head from which projects conventional mechanism l2, this including a shaft l3 having a tapered socket or chuck for receiving a tapered shank H which represents part of the present invention.

More specifically the attachment l consists of a case l having the socket 9 at one end thereof and a bearing box l6 at its opposite end in which are bearing assemblies IT, 18 through which a shaft i9 is disposed and from which projects the tapered shank H.

The inner end of the shaft I9 has a beveled gear 20 which meshes with a beveled gear 2| located on a hollow countershaft 22, the upper end of this countershaft being reduced as at 23 and disposed through a bearing assembly 24 located in a pocket 25. The pocket 25 has a removable cover plate 26 to permit access to a nut 26a on the upper end of the shaft 22, as when it is desired to remove the shaft 22 from the case 15. Further, asecond pocket 21 is provided at the lower portion of the case l5 and this contains a bearing assembly 28 held in place by a removable cover 29, and as is shown in Figure 5, the lower reduced end of the countershaft 22 depends through the bearing assembly 28 and through the cover 29, where it is provided with a nut 30.

An end mill 3| has a tapered shank 32 which is disposed into the hollow shaft 22 and is threaded at its upper end to receive a screw 32a, the head portion of which seats in a countersink at the upper end of the shaft 22.

A drain plug l5a is provided in the bottom of the case l5, and, of course, suitable belt rings or washers can be employed in conjunction with the

bearing assemblies

24 and 28.

Obviously, when the drill is in operation, the gears 20, 2| are operated and the end mill 3| rotated into the work.

Figure 1 shows a cylinder A or like structure in which a keyway B is being milled by the end mill 3|.

Obviously, when the drill head has been removed from the attachment, the attachment can readily be removed from the tapered shank 8 (see Figure 5) by simply inserting a tool or the like into a slot 33 in the socket 9 and exerting a slight force against the adjacentend of the shank 8.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

In a machine of the class described, the combination with a tail stock and a chuck-carrying head stock, of a tapered shank mounted in said tail stock to extend horizontally therefrom, a closed casing interposed between said shank and chuck and having a tapered socket extending from one side thereof and wedged onto said shank, a. horizontal shaft extending from said chuck into the opposite side of said casing, a vertically disposed hollow countershaft rotatably mounted in said casing to extend out of the bottom of the same, a milling tool secured in said countershai't to depend therefrom, and bevel gearing in said casing operatively connecting the horizontal shaft to the countershaft.

JAMES M. SCHMIDT.