US318824A - James e - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1. J. R. STREETT.

RIFLING MACHINE FOR HEAVY GUNS.

Paten ii (No Model.) 2 SheetsSheet 2. J...R. STREETT.

RIPLING MACHINE FOR. HEAVY GUNS.

No. 818,824. Patented May 26, 1885.

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JAMES R. STREETT, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR OF ONE-HALF TO JAMES H. L. EAGER, OF SAME PLACE.

RIFLlNG-MACHINE FOR HEAVY GUNS.

SPECIFICATION forming part of Letters Patent No. 318,824, dated May 26, 1885.

Application filed March 18, 1885. (No model.)

To all whom it may concern.-

Be it known that 1, JAMES R. S'rnnnrr, residing at I'Vashington, in the District of O- lumbia, have invented certain new and useful Improvements in Riflingdtlachines for Heavy Guns,of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to implements for riding heavy guns; and it consists in the constructions and combinations hereinafter set forth and claimed.

In the drawings, Figure 1 is a side elevation and front view of a riding-head with cutters for riding eight grooves. Fig. 2 is an elevation of the same head with cutters and cutter-carriers removed. Fig. 3 is a partial section of the same head through the cutter-box. Fig. 4 is a detached view of one of the cutterholders. Fig. 5 is a front end elevation of a modification of the riding-head, part of the front plate broken away. Fig. 6 is a longitudinal central section of same. Fig. 7 is a front elevation of the cutter-box, cutter-carriers, and cutting-bits. Fig. 8 is a longitudinal section of the cutter-carrier box. Fig. 9 is a perspective view of one of the cutters. Figs. 10 and 11 are front and side views of a graduated wrench for adjusting the regulating-screws.

I will first describe the modification shown in Figs. 1 to 4.

A is the cutter-stock, which is attached by its shank B to a riding-bar, and is forced for- -5 ward into the gun, (preferably from the muzzle,) the forward movement and the twist being produced by machinery of usual construction, the same forming no part of my present invention. The front end of this stock has a cruciform slot, A, therein when four sets of cutters are used.

lhe center piece 0 rests in a recess in the front end of stock A, and is secured therein by bolt 1). This center piece 0 has as many 5 plane faces on opposite sides as it is found desirable to operate upon. In the present case the piece 0 has four plane faces, which form 7 supports for as many cutter-holders; but it is apparent that the center piece may have any number of faces, and that two, four, or any other number of cutter-holders may be applied and a corresponding number of grooves cut at each advance of the cutter-stock.

E is the front plate of the rifling-head,which rests against the stock A and is firmly secured 5 5 thereto, thus making inclosed casings of the slots across the face of the cutter-stock, each casing having a radial opening. In each of these inclosures in the riding-head there is a closely-fitting cutter-box, F, which has its seat against the center piece G, and is held against rising by the pin G passing through the faceplate and box and entering the stock A.

In each cutter-box there is one, or, preferably, a pair of cutter-carriers, H, pivoted at I on a spindle passing through the cutter-box from side to side.

The cuttercarrier has a rear projection having curved end K,which rests in a curved recess in the cutter-box. The lower arm, L, of the cutter-carrier .is also preferably arcshaped,and the cutter-box is made to conform thereto. An offset, M, from the side of the lower arm gives a bearing for the set-screw N,-Which passes through the front plate. A spring, O, in the rear wall of the box bears against the lower arm of the cutter-carrier.

A forward-projecting arm, S, extends into a notch in plate E.

The upper face of the cutter-carrier has a dovetailed groove, in.which there is a cutter,

P, of hardened steel, secured firmly in the dovetailed groove in the cutter-carrier, and projecting above the face of the carrier. These cutters or teeth are arranged at an obliquity relative to the axis of the riding-head, approximating the average pitch of the riflegrooves. They are secured in position in any convenient manner, as by screws or a screwplate,iu front and rear. The cutters are nar- 9o rowerin the rear than in front, and the grooves in which they are held are of corresponding form.

The screws N N pass through thefront plate, E, and are in front of the carriers H, in such position that said carriers cannot swing forward far enough to elevate the tools P beyond the depth of the completed riding, when these screws need not be moved again during the operation of riding the gun. The screws N Q I Y 318,824

are turned out slightly at the first cut, when spring will press forward the arm L of the cuttercarrier. As the riding-head is forced forward the resistance of the cutter tends to rock the cutter-carriers toward the screws N, and thus drive the cutters deeper into the work; but the screws N serve to prevent this. After each cut the screws N may be retracted, thus permitting the cutters to make a deeper cut. These screws N must be all uniformly adjusted, so that all the cutters will enter the groove to an equal depth. This adjustment is accomplished by a wrench working on a graduated are or disk. (See Figs. 10, 11.) It being premised that all the cutters have the same radial projection, then the graduated plate R is applied against the face-plate E, so that the wrench S, which is swiveled in plate B, may

pass over the head of one of the screws N. The wrench B may then be turned, and a very fine adj nstment thus be made, and by turning all the screws N successively in this manner the cutters are advanced equally.

The same wrench, or one difiering only in size, may be used in the same manner for operating the screw which advances or retracts wedge-piece O, as will be hereinafter described. I will now describe the construction of my device, whereby all the cutters may be adjusted simultaneously.

The cutter-box F, Figs. 5, 6, 7, and 8, differs but slightly in construction from that here inbefore described. Side plates, at a, are rabbeted to the base I), and attached by screws or pins for convenience in construction. The cutter-carriers H are pressed forward by spring 0 against the screws N, which pass through the front plates, q, of the box, their heads extending through slots in the face-plate E.

The center piece 0 is made wedge-shaped for a portion of its length, and the stock A is recessed to permit a longitudinal movement of this center piece, the movement being accomplished by means of the screw e, which passes through the center piece and has a collar, f, at each end thereof, and engages a screwthread in the head-stock;

The cutter-boxes are held by keys or splines g to the center piece 0 these keys being dovetailed into the boxes and center piece in such manner as to permit alongitudinal movement of the center piece with reference to the boxes, but to hold the boxes firmly against radial movement away from the center piece.

' The face-plate E may have a central detachable piece, E, to permit the removal of the wedge-shaped center-piece O and its screw entirely from the stock, which thus permits the radial withdrawal of the cutter-boxes.

It is intended that the joint between the cutter-carrier H and the cutter-boxes (as at m) shall be tight, to prevent any chips or scraps of metal entering. The joint at a may be closed by the insertion of bits of rubber or similar material.

The cutters operate as the bar is thrust or drawn forward, the springs 0 serving to press them first into operative position, and the screws N holding them against advancing into theimetal farther than the predetermined distance. In withdrawing the head the tools press the springs back, and no injury to the completed work results.

The cutters can be advanced after each cut to the amount required for the next out either by setting the screws N or by moving in the wedge-piece G, which presses out all the cutter-boxes uniformly.

Very fine adjustments of the cutters are required, to distances measured by the onethousandth of an inch. This fine adjustment of all the cutters simultaneously may be meas ured by the movement of the wrench S on its graduated plate, when the wrench is applied to the screw 6, which actuates center-piece O.

I claim 1. A riding-head having radial grooves, cutter-boxes therein, pivoted cutter-carriers in said boxes, and cutters on said carriers, as set forth.

2. In combination with a rifling-head, a

radially-movable box therein, a cutter-carrier.

in said box, having a firm abutment to resist its outward extension while moving forward, and a spring which yields to permit the depression of the cutter while withdrawing the head.

3. The combination, with a riding headstock having radial grooves, of a series of cutter-boxes, cutters, and carriers mounted in said grooves.

4. In a riding-head, the combination of a grooved stock, a face-plate attached thereto, a series of cutter-boxes in said grooves, and pivoted cutter-carriers in said boxes, as set forth.

5. The cutter-boxes, the pivoted cutters therein having close joints with the boxes, and springs for rocking the cutter-carriers on their pivots.

6. The combination, with the cutter-boxes and pivoted cutters mounted therein, of adj Listing-screws in front of said cutter-carriers to determine the limit of movement thereof.

7. The combination, with the rifling-head, of a series of cutter-boxes in radial grooves therein, and a plurality of cutters mounted in each cutter-box, substantially as described.-

' 8. In a rifling-head, the combination, with the stock, of a radially-movable central wedgepiece, a series of cutter-boxes surrounding said wedge-piece and keyed thereto to permit radial but not longitudinal movement, and a plurality of pivoted cuttercarriers mounted in said boxes.

9. In a cutter-carrier box, the combination of the base b, the side pieces, a a, rabbeted thereto, and the cutter-carriers pivoted in said box on a pivot passing through the sides thereof, substantially as described.

10. The combination, with the stock A, of the face-plate E, having removable center piece E, the wedging center piece 0, the In testimony whereof Iaffix my signature in screw 6, which aetnates said center piece, presence of two witnesses.

and the cutter-boxes keyed to said center piece, as set forth. JAMES R. STREETT.

11. The combination, with the set-screws of a, rifling-head, of a graduated wrench-plate, Witnesses:

and the wrench pivoted in said plate, as set MARGARET STREETT,

forth. J AMES H. L. EAGER.

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