US1310933A - And ethan vialii - Google Patents

Description

E. A. SUVERKROP AND E. VIALL. METHOD 0F AND MEANS FOR RIFLING GUNS.

APPLICATION FILED JUNE 4.19l8.

Patented July 22, 1919.

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UNITED STATES PATENT OFFICE.

EDWARD A. SUVERKROP, 0F SEA GLIFF, NEW YORK, AND ETHAN VIALL, OF EAST ORANGE, NEW JERSEY.

Specification of Letters Patent.

Patented July 22, 1919.

Application led .Tune 4, 1918. Serial No. 238,106.

To all whom it may concern:

Be it known that we, EDWARD A. SUVER- Kizor, a citizen of the United States, residing at Sea Cliff', Long Island, New York, and ETHAN VIALL, a citizen of the United States, residing at East Oran e, New Jersey, have invented a new an useful Imrovement in Methods of and Means for itling Guns, of which the following is a specification.

This invention relates to a method of and means for forming the rifiin lands in guns, and while it can be adapte for rifing the barrels of small arms it is more especially serviceable for cutting the rifling grooves in the tubes of heavy ordnance, such as field pieces, anti-air craft, coast defense and naval ns, particularly those pieces in which t e rifling has a progressive twist.

The object of the invention is to provide a simple method and relatively inex ensive means whereby the grooves may 'e cut either forwardly or backwardly, as is considered most expedient, and the rifling lands formed very rapidly with any predetermined increasing or decreasing or uniform twist which is called for.

In attaining this end according to this invention all or a majority of the rifiiiig grooves are cut at the same time and completed or substantially nished by one continuous passage of the broachin tool through the gun, the gun bein he d stationary, the too] guide being he d fixed in the axis of the bore of the gun, and the breaching tool bein made up of a plural number of indepen ent toothed cutters so formed and arranged that each cutter, as they are pushed through the bore of the stationary gun and follow the fixed guide therein, removes more of the metal than the preceding cutter, and thereby the roughing out and finishing of the grooves proceeds coincidently.

In the accompanying drawings Fi re 1 shows a horizontal section of a fiel n being treated according to this invention and a plan of one form of apparatus which may be used for practisin the invention. Fig. 2, on much larger sca e, shows a section of a short length of the gun with the grooving cutters being ushed therethrough on the guide therein. ig. 3 shows a transverse section on the lane indicated by the dotted line 3 3 on Fig. 2, looking toward the front of the first toothed cutter, that is, the one which makes the smallest cut. Fig. 4 shows a transverse section on the plane indicated by the dotted line 4-4 on Fig. 2, looking toward the back of the cutter that makes the largest or iinal cut.

In the views a common type of gun 5 is shown as mounted upon pillow blocks 6 to which the gun is firmly secured against movement of any kind while the riliing grooves are being cut. Extending longitudinally through the gun and some distance beyond each end is a circular shaft or uide bar 7. The bar is supported at its en s by standards 8 and is held firmly against movement with its axis coinciding exactly with the axis of the bore of the gun. Along the length of the bar are one or more, preferably two, grooves or guideways 9. These guide grooves are out on a spiral or twist having exactly the same pitch as the riing grooves to be cut, and it is essential, if the rifling vtwist is progressive, that the bar be positioned lon 'tudinally in the bore so that at all points t e pitch of the grooves will be the same as the predetermined pitch of the rifling, for the grooves in the bar determine the twist of the cuts made in the wall of the bore of the gun.

Fitted upon and movable along this fixed guide bar is a broachin tool which consists of a plural number of independent toothed cutting blades 10. These blades are separated by spacing washers or thrust collars 11 of suitable material. The cutting blades are in the form of annular disks and they have keys 12 that fit into the grooves in the guide bar. The outer ed es of these blades which make up the broac in tool are provided with cutting teeth 13, esirably equal in number to all of the rifling grooves to be cut in the gun. Those teeth are so ground and the blades are so located upon the guide bar that the advanced blade will make sli ht cuts, as shown in Fig. 3, the next mailing increased cuts and so on, each blade increasing the cuts until the last blade completes the rooves and forms the riding lands 14 to nished size and shape, as shown in Fig. 4.

In the apparatus illustrated these toothed disk-like cutting blades which form the breach are forced through the bore of the sists in simultaneously fitting lead screws 18. These lead screws may be provided with Worm Wheels 19 which may be turned by Worms on a shaft 20 that can be driven b a motor 21. The views illustrate the rit ing as commencing at the muzzle and working toward the breech. It can, however, be commenced at the breech and worked toward the muzzle by simply mounting the gun end for end and turning the guide end for end.

With the construction described each cutting blade is free to take such a rotative movement as will be imparted by the grooves of the guide bar Withoutinterfering with the different rotative movement necessarily taken by the cutters from which it is separated by the spacing Washers or thrust collars, which is essential when the cutters are being pushed through the bore and the riding pitch is to be progressive, that is, increases in twist from breech to muzzle, or decreases in twist from muzzle to breech, according to the method adopted of commencin the riding at breech or muzzle.

zreat power can be applied with such an apparatus asis illustr ted and as each cutter is required to cut but its own small section of the grooves the cuts are clean and true, and the entire grooving can be accomplished at the required itch by once forcing the broach through tie gun. As the guide bar is rigid in the bore ef the stationary gun and merely has to guide the cutting blades the work can be accomplished very rapidly Without great power but with exceedingly accurate results. Of course, if desired, the cutters may be so ground that, to complete the ritling, the broach may be passed through the bore of the gun more than once.

The invention claimed is;

1. The method of riing a gun which consists in mounting the gun in a fixed osition, fixing a `guide bar in the bore o the gun with its axis coinciding with the axis of the bore, and simultaneously. forcing a plural number of independent cutters having teeth of increasing size along` the gig-1de bar through the bore of the gun, and t roby at one continuous operation roughing and {inishing the riflin grooves.

2. The metho of riding a gun which consists in mounting the lgun in a fixed osition, Xing a guide bar in the bore the gun with its axis coinciding with the axis of the bore, and simultaneously advancing with a spiral movement a plural number-"of in dependent cutters having teeth of increasing size along the guide bar through the bore of the gun, and thereby at one continuous operation roughing and 'finishing the -niing grooves.

`2. The `method orf riling a gun which conforcng a plural number of independently rotatable cutters having teeth of increasing size through thebore of the gun, and thereby at one continuous operation roughing and finishing the ritling OOVBS.

4. The method of rifiing a gun which consists in simultaneously forcing a plural number of independently rotatable cutters having teeth of increasing size. through the bore of the gun and imparting a rotary movement to the cutters as they are advanced, and thereby at one continuous operation roughing and finishing the rifling grooves.

5. The method of riling a gun Which consists in simultaneously forcing a plural number of independently rotatable cutters having teeth of increasing size through the bore of the gun and imparting an increasing rotary movement to the cutters as they are advanced and thereby at one continuous operation roughing and finishing the rifling grooves.

6. The method of rifling a gun which consiste in simultaneously forcing a plural number of independently rotatable cutters having teeth of increasing size through the bore of the gun and imparting from the interior of the gun a rotative movement to the cutters as they advance, and thereby at one continuous operation roughing and finishin the riiing Egrooves.

The metho of rifling a gun Which consists in simultaneously forcing a plural number of independently rotatable cutters having teeth of increasing size through the bore of the gun, and thereby in one continuous operation forming rilin grooves in the bore which are deeper than tie cut made by the first cutter.

8. The method of rifling a gun Which consists in simultaneously forcing a plural number of independently rotatable cutters having teeth of increasingr size through the bore of the gun, and guiding said cutters from the interior of the gun and thereb in one continuous operation forming ri ing grooves in the bore which are deeper than the cut made by the first cutter.

9. The method of rifling a gun which consists in simultaneously forcing a plural number of independently rotatable cutters through the bore of the gun and supporting said cutters in the interior of the gun.

10. The method of rifiing a gun Which consists in simultaneously forcing a plural number of independent cutters through the bore of the gun and supporting and guiding said cutters from the interior of the gun.

11. The method of riiiin a gun which consists in simultaneously orcing a plural number of independently rotatable cutters with a rotative advancing movement throu h the bore of the gun.

12. sans for cutting riding ooves in the bore of a gun consisting of a xed guide bar, a plural number of independent cutters movable along said guide bar and given a rotative movement thereby, and means for moving said cutters alon said guide bar.

13. Means for cutting r' ing ooves 1n the bore of a gun consisting of a xed guide bar, independent cutters having teeth of increasing size movable along said bar and guided thereby, and means for moving the cutters along the bar.

14. Means for cutting riling rooves in the bore of a un which consists o a spirally grooved i e bar, independent cutters movable a ong said guide bar and guided by said groove, and means for moving the cutters along the guide bar.

15. Means for cutting riing grooves in the bore of a gun consisting of a xed grooved ide bar and a broach movable along said bar and guided thereby, said broach consisting of a plural number of independent blades provided with cutting teeth of diii'erent sizes.

16. Means for cutting rifling grooves in the bore of a gun consisting of a fixed guide bar, a lural number of independent cutters Inova le along said guide bar and given a progressive rotative movement thereby, and means for moving said cutters along said guide bar.

17. Means for cutting riling ooves in the bore of a un consisting of a Xed guide bar, indepen ent cutters havin teeth of increasing size movable along said bar and guided thereby, means separatin said cutters, and means for moving t e cutters along` the bar.

18. Means for cutting riding grooves in the bore of a gun consisting of a fixed grooved guide bar and a broach movable along said bar and guided thereby, said broach consisting of a plural number of independent cutting blades provided with teeth of different sizes and also provided with keys fitting the grooves of the guide bar.

EDWARD A. SUVERKROP. ETHAN VIALL.

Copies of this patent may be obtained for ve cents each, by addressing the "commissioner of Patents, Washington, D. 0.

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