US1316236A

US1316236A - hoffman

Info

Publication number: US1316236A
Authority: US
Publication date: 1919-09-16
Anticipated expiration: 1936-09-16

Description

W. M. HOFFMAN.

BORING MACHINE.

APPLICATION FILED OCT. 21. 1916.

l ,3 1 6,286. Patented Sept. 16, 1919.

2 SHEETS--SHEET 1.

k &

my W 741W W. M. HOFFMAN.

BORING MACHINE.

APPLICATION FILED OCT. 21, l9l6.

1 3 1 6,23 6 Patented Sept. 16, 1919.

2 SHEETS-SHEET 2.

" the article b which-is to bebored out as driven by any appropriate means,

, shells used for analogue 'By thus impinging WILLIAM H. HOFFMAN, 0F TORQNTO, ONTARIO, CANADA.

BORING MACHIN'E.

Specification of Letters Patent.

Patented Sept. 16, 1919.

Application and October 21, 1916. serial No. 126,838.

To all whom it may concern:

Be it known that I, WILLIAM M. Horr- MAN, citizen of the United States, residing at Toronto, county of York, Province of Ontarlo, Dominion of Canada, have invented a certain new and useful Improve ment in Boring-Machines, and declare the.

following to be a full, scription of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanyin drawings, which form a part of this speci cation.

My invention relates to devices for borthe interior of explosive clear, and exact deing and truing up structures, and consists in the va-' rious combinations hereinafter described and pointed out in the, claim.

In the drawings- Figure 1, is a detailed vertical sectional view of the upper p rtion of such a boring machine.

Fig. 2, is a lower portion of derstood that the detailed sectionalyiew of the my machine, it being unlower and upper portions fit together to make one common machine,-

it being broken away at the point of join In the drawings, similar; letters refer to similar parts. a, represents a framework of proportionate size and strength to hold hereinafter described. In the framework 0) is a socketva within whichthe article I) to be bored may be held by set screws'c, c, or other convenient means. (1 is, a water pipe leading from any convenient source of water pp y the case shown is a shell having an orifice 0. upon the boring tool the water keeps-the tool and article to be bored comparatively cool. In the arrangement made it also has a further function, that is of'carrying the boring chips directly awayfrom the surface upon which the boring is performed and out through the bottom of the shell in the direction shown at e',.

The framework ais of course adequately supported, but as the support forms no part of the device it is not shown. In the lower part a, of the frameworka there is journaled a beveled gear wheel 7 driven by a pin.- ion f onthe shaft P which, in turn, is as a band military purposes, or other and which passes through the upper end of the article I) to be bored, which in liquid force pump;

introduction of water,

wheel f. Of wurse,-the shaft runs in appropriate bearing f* and is appropriately supported and driven in any convenient way and by any convenient means-which' meansis no part of m invention and which is familiar to every mechanic. On the hub of the'gear wheel is a ring 9 somewhat la r er-in diameter t an the bearing 'and'held at t e hub of the wheel by set screw g. This ried a strong tube 'h. This tube It forms the barrel of a hydraulic ram, the upper ring serves the purpose'of keeping the gearwheel in its bearing. Attached to the framework a, a an is a subframe a composed of 1 strong bars at the lower end of which is carpurpose of saving weight.- At the upper end of the ramisa liange' 70' upon which is attached a ball bearing k This ram opcrates a pressure bar or plunger .m having a spline n thereon which engages a corresponding groove in the gearwheel .7 whereby the gearwheel compels upon the bearing 70 of the boring bar is arose-cutter p which, having cutting surfaces thereon andgroov'es there-for, trims out the other hollow material to be operated upon,

' even to the foiward end thereof, with an;

suitable form that is chosen to be adopte It is obvious that the boring harm being slidably, but not rotatably attached to the gear wheel fmust revolve with the gear wheel but may be pushed or fed into the interior of the article to be operated upon by means of the hydraulic ram or plunger is. There is nothing new in the rinciple of operating this rain, which is y means of a therefore I. donot show it. Anoutlet k may when the tool is desired to descend, is opened and the tool descends by its own, weight upon the outflow of the water at k". I y

.Oneof the chief. advantages of this form of boring bar is the fact that heretofore in boring'bars and machines the boring bar has been horizontal and the chips would be in the way of the cutter. Inasmuch as most of the material to be operated upon is of high carbon steel and the chips, when cut, become very hot, and when suddenly cooled by the are apt to be tempered more or less hard and thus not only the bar m to rotate Upon the upper end endji of a shell or be furnished which,

interfere with the cutter but are apt to dig into the inner surface of the article to be operated upon and thus produce irregular? ties therein as well as springin the bar over and making the interior sur ace eccentric with the exterior surface. By arranging the mechanism as I have described the device is very simple, very certain to work, and the chips are carried immediately away from the boring tool so that they do not 1nterfere with it.

I preferably use a form of cutter with a pilot nose 7' on which is adapted to enter the cored-out end into the perforation in the end thereof and although grooved for the purpose of the admission of water, yet acts as a pilot guide for the cutter to prevent any accidental swerving of the cutter from the true line by reason of one side of the article being operated on being harder than the opposite side. This pilot is shown at r. I

, prefer to mount the cutting tool upon the boring bar by a concentric screwthread which is, of course, opposed to thedirection ing of the bar upward, at the same timerotating it by means of the gears, enables theinside of the rough article to be trimmed out and trued up with great facility and with the introduction of water, as stated, at the upper part, the chips are all carried away without interfering with the work, so that the article. is certainly, expeditiously and accurately finished.

I have not shown supports or holding means,ras those may be adapted to the situation in which it is placed and inasmuch as they form no part of my invention I have not deemed it necessary to describe them.

Having thus described my invention, what I claim is" In a boring machine, the combination of a vertical boring bar, a frame supporting the same and adapted to support the article to be operated upon, a gear non-rotatably but slidably mounted upon said boring bar and forming a bearing therefor, a bearing in said frame for said gearwhe'el, means for operating the gearwheel, a hydraulic ram for forcing the boring bar vertically upward, and means for introducing water at the upper end of the article to be operated on, substantially as described.

In testimony whereof I sign this specification.

WILLIAM M. HOFFMAN.