US1333570A - Firearm - Google Patents

Description

STATES PATENT onirica.

vJoiru n. PEDEBSEN, or JAcK'somwYomm FIREABM.

Sp eciication of Letters Patent.

Patented Mar. 9, 1920.

Application filed November 27, 1917, Serial No. 204,149. Renewed July 31, 1919. Serial No. 314,426,

-arms in which the barrel is without-longitudinal movement relative to the frame, but is detachably united thereto.

My present .improvements are .especially applicable to that class `of small-arms among others, which are commonly designated as auto-loading pistols, and which usually comprise three'principal members, including a frame; a bolt-carrier (or breech-slide) -slidably mounted on the frame; and, a nonreciprocating barrel slidablyv supported at its forward end in the bolt-carrylng slide, and at its rear end detachably connected to the frame.

One of the principal objects of the invention is to furnish' for use in firearm mechanisms of said class., an improved interlockconnection for detachably uniting the barrel to the frame,and comprising a transverse bar, or cross-bar, which inaddition to directly and releasably uniting 'the barrel to the frame shall also be directly coactive with the breech-slide for holding in place and releasing such cross-bar.

In the accompanfylng drawlng forming a cation, my present 1m- I auto-loading pistol, of which only the forward portion is shown, but'l suiiicient for' fully illustrating the arrangement and mode of operationof the features and devices hereinafter described. t

Figure 1 is a side View or elevation of the forward portion of an auto-loading pistol comprising my present improvements vin a preferred form and arrangement thereof; .in this view the bolt-carrier, or breech-slide, S, is shown in its forward orliring position.

Fig. 2 is 'a side elevation similar to and drawn in alinement with and below Fig. 1, but showing the breech slide retracted to about the ,usual loading position; in this view some of the parts are shown partially broken away for more fully illustrating certain features, as hereinafter more fully described.

Fig. 3 is an enlarged cross-section taken on the line X3 of Fig. 1, for showing in a side view thereof and in working position, the cross-bar, C, whereby the barrel and frame are detachably united.

Fig. 4`is a cross-sectional view similar to Fig; 3. for illustrating the manner of withdrawing and inserting said barrel-andframe connecting cross-bar, C; in this view, the cross-bar isshown as being withdrawn about one-thirdjof its length.

' Fig. 5 'is Aan enlargedview of a portion of Fig. -1, but with some portions broken away or shown in section, for illustrating in some instances as regards the manner of 'Iittmg together the coactmg members and surfaces.

Fig. 6 is a vieW,-^similar to 2,-for

illustrating a modification in the organization and m'ode of fitting together and connecting the frame, F, barrel, B, and slide,

. b, ofthe firearm mechanism, and which may or handle on one endof said cross-bar.

i Fig. 8 is a view corresponding to al portion of Figs. l and 5, yfor illustrating theA improvement when the cross-bar is made circular in section; and, Fi 8a is a similar and correspondmg vlew rom the opposite side of the firearm.

Vcertain variations which may be adopted Fig. 9 is a cross-sectional View similar to vFigs. 4 and. 7 for further illustrating the features shown in Figs. 3 and 8a.

Fig. 10 is a plan view, taken on the line X1",.Fig.l 5, for showing the cross-bar, C, in a top view, and also the arrangement of certain features thereof relative to the barrel, slide and frame.

, Figs. 11 and -12 are, respectively, a sidev .view and an end view of the cross-bar when this member is made square in cross-section; and, Figs. 13 and 14 are views similar vto Figs. 11 and 12, for showing :the cross-bar when made circular in cross-section'.

Similar characters designate like parts' in all the views.

,. In the drawing, F 1s the forward portion I -of the frame or receiver of an auto-loading pistol of the class to which my present invention is applicable. This frame-member in practice, may be made of any suitable do not require a particular descriptionfv see', for instance, Figs. 2, 3, 8, 9, of U. S.

Patent, No. 580,924, April 20, 1897. The

particular style or variety of slide, S, which is herein illustrated, is shown as being one of that well-known class of sliding breech-bolt carriers which are removable from the frame in a forward direction only; hence, I have herein shown the slide formed and arranged for having the barrel, B, 1nserted therein (in a well-known manner and herein shown) while the slide is'o from the frame, so that these two members, S and B, after being thus assembled together may be thentogether slid into place in the usual manner, from the front of the frame.

The forward portion of the slide S, (at the left-hand in Figs. 1, 2). is shown formed with an interior barrel chamber, 3, and as having in section, (Fig. 3), a customary inverted-U shape, so that the slide, at the section indicated, may be said to have,-.to be made up of,-a top-wall, as 3", (usually curved about as shown), and the two depending side-walls, 3c, 3', which extend downwardly to a position somewhat lower than the bore of the barrel. In one of these side-walls. in this instance, the side-wall 3,-there is formed a recess or gate-way, as 2, for a purpose hereinafter explained.

The barrel is designated in a general way by B, and is shown inclosed within the slidechamber 3*, (Figs. 1, 2, and 3), excepting that the forward end, 2*, is shown slidably supported in a well-known manner in a ring or bearing, 3, which is removably fixed in .the forward end of said slide member, so

that said end-portion 2a may be said to extend outwardly, in a forward direction, from said chamber 3a; 'this' feature of the vbarrelmounting is also illustrated in Figs-5 and 7 of U. S. Patent No. 747,585, dated Dec. 22, 1903. The temporary removal of said ring 3, also facilitates the preliminary assem ,bling of the slide and barrel, already mentioned. The rear end, 2", of the barrel B is shown enlarged to nearly fill,transversely, said chamber 3, and thus alsoto form at 2,

` a shoulder, between which and said bearing 3a, the slide-actuating'fspring, N, isheld under suitable compression.

In the'system as thu's fardescribed, of

organizing the three principal member-sof an auto-loading pistol, it is contemplated that,-for the purposes of my present 'miprovements,-the barrel at the rearward end thereof will be supported and releasably retained in position by an interlock-connection directly withthe frame. It is also desirable, obviously, so to unite the'barrel and frame that the rearward end of the barrel can have no movement,-nor 4any play,-trans versely of the frame either laterall or vertically. When the slide S has t e usual upper wall, (as indicated for instance, at 3", Fig. 3), of course, the barrel B will be covered or housed in by said slide-wall.

However, the rear end- 2h of. the barrel,-

(except 1n a modification hereinafter described), is preferably so reduced in `size relative tosaid chamber space within the slide, as not to actually Vbear against the .inner surface of said slidewall,-thus avoidsmall amount of space actually orv normally required is shown very much, enlarged to secure clearness of illustration.

For the purpose of releasably connecting the barrel with the frame, these members may be provided with inter-engaging portions and with -a fastening which Ytogether constitute a. device in the nature of an interlock. The form of this device herein illustrated has an interlock construction made in substantial accordance with aV well-known barrel-and-frame attaching means of which one instance is well illustrated in U. S. Patent No. 489,366, dated January 3, 1893. In accordance with the principle and method there illustrated, the frame F, is herein shown having formed therein the recess a3, (see Figs. 2 and 3, of said Patent No. 489,366,

and also of the drawing of this application),

and the barrel B is 'shown provided with a downward extension, b', which in practice may have any proportions convenient and suitable for the particular size and shape of the recess. Said depending portion b of the barrel, should, ofcourse, tit rather closely between the side walls of the recess (see Figs. 3 and 10), so that the rearward end 2h which is fitted into the cross-bar seat, at at,

of the frame, and into the similar seat, at b2, cf the barrel; these seats thus form, in effect,

transverse and alined cross-bar seatswhich extend through the frame and are positioned -ferent position and construction,

partly above and partly below the plane of the lower edge of the bar-retaining means which is appurtenant to the slide.

'While the class of tenon-and-cross-bar connection disclosed in one form thereof in said Patent No. 489,366 is a well-known mortise-joint kind of barrel-attaching means, especially in shoulder arms, yet, in my present improvements, the cross-bar has a difand thus operates and directly coacts in a new way in combination wit-h the sliding bolt-carrier of an auto-loading firearm having a nonreciprocating barrel. In each of these linstances, however, it will be seen that on withdrawing the cross-bar, the barrel is removable from the frame by a sliding movement and in a forward direction only.

In the operation of the mechanism, the cross-bar C receives by direct Contact, andreceives transversely thereto, the rearwardlyacting pressure of the barrel under the re-` coil, and also the pressure of -the spring N as transmitted thereto through 'the barrel; and, as regards the sustaining of these trans'- ve'rsely-applied forces, said cross-bar does not have imparted thereto any turning movement or tendency to rotate. Hence, in practice, the mid-length portion of the crossbar may have any desired form orv shape -in cross-section. This crosssectional form is shown in Figs. 1 to 7, as being rectangular, and this for convenience Aof manufacture may be a square. When of this construction, said cross-bar has the advantage of flat forward and rearward surfaces (see Figs. 2 and 6) on and by which'to receive and transmit the pressures and forces; also, in tting together the several parts during' the process of manufacture, the cross-bar may be fitted closely as against movement in a direction longitudinally of the frame, -while fitted much more freely in a relatively vertical direction. The latter arrangement is briefly illustrated inthe fragmentary view Fig. 5, where the Ybarseat at a4 in the frame F is shown with small but clear spaces' at e and c', above and below' the square cross-bar C. This construction and arrangement is deemed to beespecially applicable when the Abauchaccording to a 6,-is to -be supportedv slide. and to be interlocked with the frame only for preventing the longitudinal movement thereof relative to the frame.

The cross-bar C is, of course, a two-mem; ber-connecting device, and in the drawing it is shown located in a new position, since it -is in a position sufficiently high in the frame so that the upper side of the seat a* is above the plane of the lower edge 3f, of the sidewall, 3, of the slide. Thus Ithe bar C and said lower edge 3t may be said each normally to intercept or interfere with the other; but an actual interference is avoided by making to prevent modification, Fig.- by and within thev and arranging the cross-bar in the following` manner:

As seen in a side view thereof, (Figs. 3, 11, 13), the cross-bar C has the end-portions c2, c3, thereofreduced in size,and hence, of a notched construction, shaped so thatwhen the mechanism is assembled, said end-portions will extend and lie closely underneath the slide- walls 3, 3c', respectively. Thus the said full-length form of the cross-bar, C, has the two bearing faces 0*-, c5, disposed longitudinally thereof, .and adapted to coact with the lower-edgesurfaces 3f, 3", respectively, of the slide S. In Fig. 4, the position of the plane f said barsurfaces c4, c5, is shown by'a medial line, as ya practice, mately midway of the height of the cross'f bar, thus bringing all thatA part of the cross,- bar which lies above said mid-plane line thereof, into a position directly between said slide-walls; 'this preferred arrangement is clearly indicated in Figs. Sand 11.-

This construction and arrangement also provides for making on of vertically-disposed and outwardly-facing.-

sitions adjoining the sides, respectively, of

the frame F andare transverse'to the lcr0ss.

bar and also to said plane of the faces c, c".

'Said surfaces c, c7, are therefore each in a position for' coacting withone of the inwardly-facing'surfaces or faces, at 3, 3h', (Fig. 3), of the slide- walls 3, 3. The lower slide- faces 3f, 3f', by an analogous coaction, but with -said barfaces c4, c5, serveA the cross-bar from turning (whenever this bar is made circular in section), while the said inner and' 'transverse surfaces c, o", positively prevent said bar from having endwise movement in either dir'ection, even when the cross-bar is fitted quite freely in its seats. l It should be understood in thisconnection that a single pair of said surfaces, as 04 3f, or c5, 3f', will' operate :effectively to prevent turning, in the manner here explained, which is by the engagement of a vslide-wall, as 3, in a notch of the cross-bar, and bythe engagement of the cross-bar within vone of'. the said slidewalls. Y

In order to rovide for inserting and withdrawing said cross-bar()4 when this member is constructed and ositioned as here explained, oneof the slide-walls, (in

being thus the cross-bar, a pairthis. instance, the wall 3) may have the interfor permitting soY side-Wall that when the slide is at some convenient point between the ends of its travel,

or working stroke, this recess will come into alinement with said cross-'bar seat a, of the frame, and thereby permit the body of the cross-bar to be pushed or drawn out through said recess as through a door or gate-way therefor. y

In some instances, if desired, instead of cutting out a recess in the said depending 'and bar-retaining slide-wall, as 3, such'wall may have, as to such bar-retaining portion thereof, its continuity of length limited in one direction for thereby'- permitting the withdrawal of the body of the cross-bar (Figs. 4, 5), outwardly past said slide-wall when the slide is in some one, (or in a sufiiciently retracted), position thereof; this 'retracted position, in practice, may be at or near the rearward end of the working stroke ofthe slide. One such limit of continuity of length isvshown at 3*, Figs. l and 5, this being the point where, in the presentinstance, a bar-retainin portion of the sllde- Wall 3? isl shown to terminated, or discontinued, in the forward direction. Thus'.

such a slide-Wall of limited length, may be considered as being one means appurtenant to the slide .and in position and arranged for. coacting with a 'transverse face, as c,of the cross-bar C,- during one portion of the reciprocating movement of the slide and for withdrawing from such coacting position during a further movement of the slide.

In practice, it is deemed desirable that recess or gate-way, 2, should not be so located as Ato be in front of the face or shoulder c ofthe cross-bar when the slide S is being held in a fully retracted position; thus the user, when desiring to take out the crosspressure to the cross-bar C durin the time the recess 2 is assing this bar, an thuswill tend to hold t e bar so firmly as to prevent any longitudinal movement during such a brief, time-interval. i

In making the frame F, the forming therein of the recess a3, of a precisionize'd size and location, is an important step, and in connection with the arrangement of the cross-bar C, I have indicated .in Fig. 10, a-

referred and improved construction of the interlock-connection which is particularly favorable for securing the required results' in those respects. The dotted circle t, represents a milling cutter having a diameter corresponding to the thickness of the depending part b' of the barrel, so that when the cutter is fed in theV direction of the arrow t', the cutter, (this being operated in an ordinary milling-machine in a wellknown manner), will'cut out the recess a3 and also leave the end-face thereof of a circular-arc form,-this is shown at b, in Fig. 10. Thus the curved -recess-face b", comes only a short distance forward of a magazine chamber with ,which auto-loading pistols are usually provided, and which is partially shown in a usual position, at m, (Fig. 10); this mode of making the recess an has the advantage of leaving a crosswall, b3, the forward side of which is curved in the plan view, and is vertical in side view,'-Fig. 2.- As ares'ult of these features, the rearward part, at b5, (Figs. 2,

v10), of said barrel-extensionv 1)', serves to .has the advantage, in practice, that the barseats, oropenings, therefor, in the barrel and frame, may be readily made by drilling and reaming, this bemg usually considered a cheaper method than the making of such seat-openings of rectangular shapes, since to make the latter lshape may involve resorting to the more diiiicult' broaching process. However, it will be observed that the transverse stresses to which such crossbar member is subjected, will be the same, or nearly the4 same inthe two cases, and that said stresses or forces do not operate or tend in any way to rotate said cylindrical cross-bar.

Also, it will now be evident that each of the pairs of coacting faces,-as c?, 3, and c", 3h', of the cross-bar and slide Willoperate in the same way for retaining the cross-bar against' a longitudinal movement thereof, whether the said cross-bar shall be rectangular or circular in section. Furthermore, the cross-bar, C,-Whether of circular or other section,-does not have in the assembled mechanism the function of a pivot in rela- 'tion to. any of the members, since .the bar-` rel alone is supported thereon and since this l .member has no turning or working movement with relation to the cross-bar or to the frame during the operationof the mechanism.

lThe upper face c5, (Fig. 8a), of the rey 'y this.- connection, it will be remembered that -heretofore in 'some instances a two-memberconnecting cross-bar for .releasably attaching duced end c3 of said cross-bar C,-provided this-bar is in the form of a cylindrical shaft, so that it is normally -revoluble in the hama-operates in connection with the.

lowerslide surface 3f. of the slide-wall 3',

to. prevent the cross-,bar from being turned in the frame during the time 'while the space or gate-way 2 (of the opposite s lidewall3,-see Fig. 5), 1s in a position close to `said bar. However, by so tting or positioning said bar-end c3 as to provide a small but proper amount of space at e2, (Fig. S), the cross-bar (when-of cylindrical form, as stated), may be allowedin soi'n'e'sltances,

to turn slightly whenever such 'a-.smallrotative movement shall, .for any reason, `be deemed desirable.

. In Figs. 1, 4, 7 and 11 the cross-bar .-C'his'.

shown provided with a ange or head, as d, which is shown fitted to lie close against the outside surface of the frame F, so that' in practice said cross-bar, when provided with this headv or "flange, will normally be held against longitudinal .movement by the coaction of the inner surface cs of`.said head :and the transverse surface c, .which is located close to thevertically-disposed inner.

as to the engagement-lof the aforesaid desurface 3l? of the slide-wall 3. When the cross-bar is thus provided with the. two

'movement-limiting surfaces cand es, the

oposite'jend thereof, c", may be omitted, anV alsolsai'd'bar may terminate at a point just 'the frame;` this omission is shown"A in .the modified arrangement illustrated in theg'sectional view. Fig. 9. In this arrangementgjfin' practice, the bar-seat, or bore in the frame, for receiving said crossbar, need not e'xtend entirely through the frame, but there'fmay be a thin wall as 2d,

Fig. 9, between thegouter surface of the frame and the end f the cross-bar, so that this bar will notthen be accessible from that side of the framewhich is oppositeto the said head d thereof. ,Y

On account of theordinary mode of taking the pistol in hand, it will usually be desirable to have the cross-bar located with the head cl thereof at the left-hand side of the pistol frame, and this, it will be understood, is the arrangement herein illustrated.

However, it will be evident without further illustration that inconstructing the parts, these may be arranged in a reverse manner in which case the cross-bar will have the head thereof at the right-hand side of the frame. A

In place of a bar-head of the particular form shown at d, it will be obvious that a 1 head of some other suitable form and size might be substituted; such another. head,

if desired, may have the shape and character of a handle, ofwhich various forms are already well-known. as applied to manuallywithdrawable barrelland-frame connecting devices in various lnds of small-arms. In

the barrel to the frame 'in a firearm, and

'having the form of a small shaft,-and pro- 9. ofu. s. Patent No. 26,364, Dec, 6, 1859.

In my present improvement, and contrary t'o said prior devices, the cross-bar member C is notturned` (and .need not be capable of being turned) drawal thereof, vbut when .the slide, S, is moved `to bring the recess or gate-Way 2. into alinement with said member C, (see Fig. 5), this member may .then be dra'wn directly outward, (Fig. 4), and, thus free thebarrel and the -fral'ne'each .from the other, except pending partof the barrel within the recess or mortise .of the frame. That outward the sliding`-bolt-carrier S is always moving preliminarily to the' with- 'movementr however, of said cross-bar is effectua-llyprevented at all times during' the normal operation of the rearm, because either forwardly or rearwardly whenever said gate-way. 2 is at or adjacent ,to said crossbar member,-s`ee Fig. 5.

From the foregoing description, it will now be evident that in the class of firearms selected for illustration herein, there are, in effect, two systems of barrel-mounting to .each of which my present invention is equally applicable as regards the retention and release. of the cross-bar by means appurtenant to the. sliding member. In the first of thesesystems,+illustrated in Figs. 1, 2, 3,-the rear end'of the barrel is directly but "releasably united to the frame in a way to prevent (when the'parts. are properly fitted) any movement of said barrel-end on, or relative to the frame. iIn thescond said system, the rear barrel-end, (Figs. "6.,'7)s`sli ably fittedl or supported by, and is guided within and by, the chamber-inclosing wall of the'slide, and is releasably united .to the frame only as regards and against amovement of the barrel longitudinally of the frame; one instance of this second system, A

(butwith a different means for, and method of, barrel connectionand release), is shown in Figs. 5.*and '7, ofthe aforesaid U. S. Patent' No. 747 ,585, in which,.however, the barrel for the release thereof, is rotatable, whereas in said first system whenV arranged .joining one A drawin `:frame and barrel each in the particular manner which I have described in connection with Fig. 6, the barrel at all times While the mechanism is assembled, is, or may be, non-rotatable.

Having thus described my invention, I claiml l. In a firearm, the combination with a frame and with a barrel', of a slide supported for reciprocating movements forwardly and rearwardly on the frame, said frame and barrel each having near the rearward end of the. barrel, interlock portions provided transversely with alined cross-bar seats, a barrel-and-franie uniting cross-bar having the body portion thereof disposed in said alined seats, and also having at the upper side and transversely upon said body' portion thereof, abearing face in a position adjoining one side-of the frame, eppur-tenant to the slide and in and arrangedfor coacting with said face of the body portion of the cross-.bar and thereb hold the cross-bar fromY displacement uring one portion of the reitziprositing movement of the slide, and for 'withi from such coacting position during.

a further movement ofthe slide;"

: 2. In a firearm, the combination Vwith a. frame. and.. with a barrel, of a slide sfupor on the frame,4

ported for reciprocating movements wardly and rearwardlyl aving near the rearward end of the barrel, interlock portions provided transversely with cross-bar seats whichfare cylindrical and alined, a barrel; and-frame. uniting cross-bar having a 'cylindrical body portion thereof disposed in said alined seats, and also having at the upper side and transversely upon said body portion thereof, a bearing face in a position ad side of the frame, and -means appurtenant tothe slide and in' osition and arranged for coacting with said of the body portion Yof the cross-bar' and thereby hold the cross-bar .from displacement during one portion of the reciprocating movement of theA slide, and for -withdrawing from such coacting position during a further movement of the slide.

3. In a firearm, the combination with-.a frame, of a chambered s lide supported on the frame and ha'ving depending side-walls rearward end, a slide-actuating spring re acting against said enlarged barrel-end, said enlarged barrel-end and the frame having interlock portions provided with alined cross-bar seats positioned in the frame at a' -barrel and also having said body portion notched for engagement with said one of th'e aring facev slidably' engaging the 'fram e,-asbarrelrinithoz 'anmeifoftl'slide and having an enlarged--v slide walls, whereby to normally retain the cross-bar in place, said bar-retaining slide' cross-bar seats positioned in. the .frame at a height partly above and partly below the plane of the lower edge of said side wall of the slide, and a barrel-and-frame unitin Vcrossbar having the body portion thereo disposed in said alined seats of' the frame and barrel, and also notched vfor engagement with the slide wall, whereby to normally hold the cross-bar in place, saidslide wall havin therein a gatefway space in a ition or 'permitting the withdrawal o the bod of the cross-bar outwardly through sai space when the slide is in one position thereof.

" 5. In a firearm. the combination. with a frame, of a chambered'slide supported on Vthe frame and provided with a side wall enging over one side of the frame'/ and there aving an inwardly-facing surface, a bar-- rel' supported within the chamber of the slide, said barrel and frame each having at the rearward end ofthe barrel, interlock portions provided transverselyl cross-bar seats positioned in t e frame at a height partly above and partlyV below the lower edge of said wall of the slide, and a cross-bar having thebody portion thereof disposd in said alined seats of theframe and barrel, ment with said inwardly-facing surface of the, slide wall, whereb the cross-bar in place, and said slide wall having therein a gate-way space in a position for permitting the withdrawal of the body of the cross-bar outwardly through said space when the slide is in one position thereof.

' 6. Iii a firearm, the combination with a frame and with a barrel, of a slide su ported on the frame and provided with a depending wall engagingover one side of the frame and here' having an inwardly-facing surface, said frame and barrel each having near 5ft-lie rearwardend of the barrel, interlock *.portlons provided transversely with alined cross-bar seatspositioned in the frame at a height partly above and partly below the lower edgey of said depending Wall of the slide, and a cross-bar hav ng the body portion thereof dis osed in said alined seats of the frame and arreland also notched for with alinedv and also notchedl for engage-v v to normally hold.

ioo

.45 lower edge of said bar-retaining surface of the slide, and across-bar having a fullbar outwardly 'past said engagement with said inwardly-facing surface of the slide w: ll; whereby to hold the cross-bar against outward movement in said seats, said depending wall having its continuity limited in one direction for permitting the withdrawal of the body of the crossslide-wall when the slide is in one retracted position thereof.

7. In a firearm, the combination with-a frame and with a barrel, of a slidev suported on the frame and provided with a depending wall engaging over one. side of the frame and there having an inwardlyfacing surface in position for engaging a cross-bar. said frame and barrel each having near the rearward end of the. barrel, intcr lock portions provided transversely' with alined cross-bar seats positioned in the frame at a height partly above and partly belowthe plane of theloweredge of said depending wall of the slide, and a vcross-bar having the body portion thereof disposed 1in said alined seats of the frame and barrel, and also having said body portion notched at one end thereof for engagement with said inwardly-facing surface of the slide wall, whereby to normally hold the cross-bar against outward movement in said seats when the slide is in forward position, said depending slide wall having a position on the slide such that during the retractionof the slide, said inwardly-facing surface will be drawn out of engagement with said notched end of the cross-bar, and thereby having permit the cross-bar to be withdrawn.

8. In a firearm, thecombination with a frame and with a barrel, of a slide supported on the frame and provided with a depending e` of the frame and there' having an inwardly-facing barretaining surface, said frame and barrel each having interlock portions provided transversely with alined cross-bar seats positioned in the frame with position substantially coinciding withv the wall engaging over one sid sized body portion thereof slidably disposed in said alined seats for thereby releasablyuniting the barrel to the frame, said crossbar having above a medial line thereof an outwardly-facing surface engaging -said inwardly-facing surface of the slide and also below said medial line thereof, an outwardly extended end-portion having an upper surface in a position contiguous to the lower edge of said depending slide wall.

9. In a firearm, the combination with a frame and with a barrel, of a 'slide sup-` ported* on the frame and provided with a depending wall engaging over one side of the frame andthere having an inwardlyfacing bar-retaining surface, said frame and barrel each having interlock portions provided .transversely with alined cross- `frame,

a medial line thereof in a` bar seats positioned in the frame with a medial line thereo-f in a position substantially coinciding with the lower edge of said barrejtaining surface of the slide, and a crossbar having a fullsized body portion `thereof slidably disposed in said alined seats for thereby releasably-unitng the barrel to the frame, said cross-bar having above a medial line thereof an outwardly-facing surface engaging said inwardly-facing surface of the slide and also having below said medial line thereof, Van outwardly extended end portion having an upper surface in a position contiguous to the, lower edge of said dependingvslide wall, and lalso having on said end-portion an enlarged head hav-A -ing an inwardl '-f`acing surface thereof in a position' contiguous to the frame.

10. In a firearm, the combination with a frame, of aslide supported on the frame and having a pair of depending side-walls which slidably inclose the top portion of the a barrel in position between said side-walls of the slide, the frame and the rearward end of the barrel having'interlock portions providedv transversel;v with alined cross-bar seats which together extend through the frame and are positioned in the frame at a height partly above and partly below the plane of' the lower edges of said side-walls, and a cross-bar having the body portion thereof disposed in said alined seats of the frame and barrel and of a length to extend under each of ,said side-walls, and also having said body portion notched near each end thereof for engagement with said side-walls respectively, whereby the sidewalls by 'engaging in said notches normally prevent longitudinal movement ,of the cross-bar in either direction, said slide having the continuity of one of said side-walls interrupted at a. position for permitting the withdrawal of the bodyv of the cross-bar' outwardly from said seats when the slide is in one position in the stroke thereof.

l1l. In a firearm, the combination with a frame, of a slide supported on the frame and having a pair of depending Side-walls whichvslidably inclose the-top portion of the frame, a barrel side-walls ofthe slide, Vthe frame and the 'rearward end of the barrel having interlock portions provided transversely with alined cross-bar seats which are circular in section and which together extend through the frame and are positioned in the frame at a height partly above -and partly below the plane of the lower edges of said side-walls, and a cylindrical cross-bar having the body portion thereof disposed in said alined seats of the frame and barrel land of a length to extend under each of said side-walls, and also having said body portion notched near each end thereof for engagement with Said side-walls, respectively, whereby the sidem position between said` -llO' walls by engaging in said notches normally prevent longitudinal movement ot' the crossbar in either' direction, and also prevent rotation thereof, said slide having the continuity of'one of said side-walls interrupted at a position for permitting the withdrawal of the ,body of the cross-bar outwardlyT from said seats when the Slide is 'in one position in the stroke thereof.

12. In a firearm. theeombination with a frame, of a slide supported on the Jframe and having a pair of depending side-walls whirh .slidably inclose the top portion ot' the frame, a barrel in position between said side-walls of the slide. the frame. and the rearward end of the barrel having interlock portions provided transversely with alined -cross-bar seats which are circular insection and which are positioned in the frame at a height partly aboveand partly below the lower edges of said side-walls, and a cylindrical cross-bar having the body` portion thereof disposed in said alined seats of the. frame and barrel and having at one end thereof an outward extension which is under one of said side-walls for thereby preventing the rotation of 'the cross-bar, said slide having the continuity of one of said side-walls interrupted at a position --for permitting the withdrawal of the body of the cross-bar outwardly from said seats when the slide is in one position in the stroke thereof.

JOHN D. PEDFARSEN.

Witnesses I' E. C. GILBERT, L. E. WETMORE

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