JPS59202400A - Tall barrel for gun and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gun breech barrel that is used in a gun (rifle) and has a seat surface on which the protruding portion of the bolt is positioned opposite to each other, and a method for manufacturing the same.

Conventional gun breech barrels have surfaces (seat surfaces or lug seat surfaces) on which spaced apart lugs rest. This lug seat surface location made it difficult to manufacture gun breech barrels with lug seats that required many operational steps and to required tolerances.

An object of the present invention is to provide a gun breech barrel that is easy to manufacture and a method for manufacturing the same. To this end, the gun breech according to the invention has a front bolt narrow opening part and a rear part, the rear part being provided with a lug seat located here.As a result, the lug seat is easy to drill and clean. The hole puncher passes through the opening in the breech and machine finishes the lug sheet.

After the lug seat has been formed, the breech blank can be cast from a predetermined amount of gold in the area adjacent to the lug seat, and after the lug seat is formed, a breech blank can be cast from a predetermined amount of gold in the area adjacent to the lug seat, and the lug seat is then formed. An example will be explained in detail.

As shown in FIGS. 1 and 2, the rifle 10 has a barrel 1
1, the transition piece 12, the bolt assembly 13-, and the bolt 1
4, the bolt handle 16, and the bolt head II-bu 17.
, and a hammer piece 19. The rifle 10 also includes a stock 21 and a barrel 22. The tail tube 12 is the front part 2
3, a rear part 24, and a hollow bolt part 26. The bolt 14 is connected to the upper bolt lug (protruding part of the bolt) 2
7 and a lower bolt lug 28. Bottom lug 27
and 28 engage the tailpiece lug seats 27a and 28a when the bolt is in the closed position (FIG. 1).

Figures 3 and 4 show the transition piece lugs 27a and 2.
8a is shown, in which a punch 35 is positioned in the opening 30 of the breech. First, a transition piece blank is formed by investment casting or other methods. The blank section of the transition piece is finished by machining, grinding, or other conventional methods.

In a part of this manufacturing process, the front area 31 of the rear part 24
．． 32 is partially removed by machining. In one embodiment of the invention, the transition piece blank comprises a metallic material in the forward region 31, 32 of the rear part (rear transition piece part) 24;
The metal material removed from the front area 31.32 by machining is placed on the surface sheet (rag sheet) 27a at an appropriate position.
+28 m to the position of the tolerance yoke. Furthermore, this manufacturing method provides that the volume of metal material in the front region 31 e 32 is preferably not excessive and is a volume that can be machined by a single stroke of the punch.

By controlling the amount of metal material in the front region 31.32, the lug seats 21h, 28m can be formed in one drilling stroke.

As shown in FIG. 4, the hole puncher 35 is
A drilling tooth 36 is provided which is machined and removed from the front region 31, 32 so as to move in the direction indicated by the arrow in the figure.

The hole puncher 35 is provided with an optimal hole of selected size, length, and angle, and its ff1j'f fruit sheet surface (rag sea)
, ) 27a and 28hf, the machining of the front region 31.32 is accomplished in only one downward stroke. The punch 35 is preferably positioned to move perpendicular to the barrel axis or a line parallel thereto (see centerline C/L in FIG. 4). With the punch 35 in the starting position during the machining stroke, the seat surfaces 27a and 28m are coplanar and each at an equal distance from one end of the barrel.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a rifle showing a rifle barrel according to an embodiment of the present invention, and FIG. 3 is a plan view of a rifle according to an embodiment of the present invention.
A hole puncher? FIG. 4 is a sectional view of FIG. 3 taken along line 4--4. 11... Barrel, 12... Tail tube (one tail tube of a gun), 14
...Bullet, 21...Buttstock, 23...Front, 24.
... Rear, 27... Upper bolt lug, 27a... Lug seat (seat surface), 28... Lower bolt lug,
28a...Lug sheet (sheet surface). Applicant's agent Patent attorney Takehiko Suzue 1, case indication Japanese Patent Application No. 158940/1982 2, title of the invention: lining tailpiece and method for manufacturing the same 3, amendment. Relationship with the Patent Applicant Sturm Noshiga An F Kenriki Y/Jin Inkobo L Nora 2d 4, Agent 5, Amendment Ordered by Nikkan on November 29, 1980 6 of the Amendment Appropriate for the target -1- (name of representative).Translation of Kanshisho Fuyohi-7, drawing 7, amendment 1 each, alternative name tracing drawings (1 each), no history)

Claims (1)

Scope of Claims: (1) A breech tube of a gun for operating the bolt of a gun, which includes a gun barrel, a bolt having a protrusion, and a stock; a housing of a breech barrel including a rear part joined together, a breech provided between the front part and the rear part and having an inner wall; 1. A breech barrel for a gun, characterized in that it is formed by a breech and has at least one seat surface for accommodating the projection of the bolt. (21J$) The breech tube of the gun according to claim 1, characterized by having two lug seats spaced apart from each other in one plane. a forming step of forming a metal breech blank with a rear section having a rear section, and passing a drilling means through an opening in the breech to remove the entire set from the rear section and forming at least one bolt lug sheet therein. (4) A method for manufacturing a gun breech barrel, characterized in that the hole-drilling means penetrates a plane perpendicular to the central axis of the gun barrel. A method for manufacturing a gun breech tube according to item 3.