US495137A

US495137A - Karel krnka

Info

Publication number: US495137A
Authority: US
Publication date: 1893-04-11
Anticipated expiration: 1910-04-11

Description

(ModeL) K. KRNKA. BXTRAGTOR AND EJEGTOR FOR BOLT GUNS. No-. 495,137. Patented Apr. 11, 1893;

fizz/e72, 2607".

fit: NONRI! PETERS 00., PMOYO-LITHQ. WASMINGTQN, n. c.

KAREL KRNKA, OF PRAGUE, AUSTRIA-HUNGARY.

EXTRACTO/RTAND EJECTOR FOR BOLT-GUNS.

" UNITED STATES PATENT OE CE.

SPECIFICATION forming part of Letters Patent No. 495,137, dated April 11, 1898.

Application filed December 17, 1891. Serial No. 415,442. (1101101.)

To all whom it may concern: 7

Be it known that I, KAREL KRNKA, a subject of the Emperor of Austria-Hungary, and a resident of Prague, Bohemia, Austria-Hungary, have invented certain new and useful Improvements in Extractors and Ejectors for Firearms, of which the following is afull, clear, and exact description.

My present invention relates particularly to the extracting and ejecting mechanism for fire arms.

Inthe accompanying drawings: Figure 1 represents a side view of the front end of a breech bolt having myimproved form of head and carrying my improved extractor. Fig. 2 is a view of the front end of the same. Fig. 3 is a view of the side opposite to that shown in Fig. 1. Fig. etis a central longitudinal section through the breech bolt and extractor device, showing also a portion of the receiver wall and representing the extractor as locked. Fig. 5 is a similar view with the extractor and ejector unlocked and in operation to eject the shell. Fig. 6 is a view similar to Fig. ,4 of a modification. Fig. 7 is atransverse section, through the receiver chamber showing the guide ways for the bolt. Fig. 8is a plan view of one half of .the two part head. Fig. 9 represents the extractor indifferent positions.

The head of the bolt is formed in two parts A, B, divided on the line :1: Figs. 1, 2 and 3.

Each half has a shank 11 Figs. 4, 5, 6 and 8, having alongitudinal channel g, which when the shanks of the upper and lower members are brought together, form the opening for receiving and guiding the firing pin F. Each shank has also the lateral projections (a b) which are adapted to a corresponding groove in the interior of the front end of 'the bolt D by which the two part head is held within the bolt and .is adapted to rotate for the purpose set forth in my application before mentioned. The head has lateral projections (a, 12 one half of each projection being formed on each member A and B, and these projections serve to guide the head within the receiver channel E, said channel having lateral branches 6 to receive the projections as shown in Fig. 7. As shown in Fig. 8, the channel y for the firing pin is continued by the channels 11 and 1: through the members A, B, of the head and the position and form of said pin is shown clearly in Figs. 4, 5 and 6. Each half of the The extractor has a hollow cylindrical portion c, which lies in the transverse channel 10 and carries a spring 0 and a pin 17, the latter bearing against the wall 15 and keeping the cylindrical part of the extractor pressed normally inward, the said cylindrical part carrying the extractor hook c, which extends for ward through the channel 13, and projects to the front of the head. At thecententhe cy-; lindrical part carries the enlargement or eye 0 arranged to lie and move slightly in the enlarged recess 11. This eye is extended by the pin 18, which enters the h0llowpart19of the ejector, which part lies in the remaining part of the transverse channel 10. This ejector carries a forwardly extending arm c projecting out through the channel 12, at the side of the head opposite the extractor hook. The

channels

13 and 15 are of greater width than the projecting arms 0 and 0' respectively, so

that said armsmay have slight movement therein laterally of the head. The extractor carries a guiding stud c which projects through the opening 20 formed'between I the halves of the projections (a, b'-) on one side,

while the end 0 of the ejector cylinder 19' projects through the open end 21 of the channel 10 on the other side.

A portion of the receiver shell is shown on the right of each Figs. 4 and 5, and in the former fig'ure' as well .as in Fig. 7, it will be, noticed that the channel 6 is formed with a .cam surface e adapted to engage the projecti'ng end 0 of the ejector when the bolt is retracted far enough.

From the above, it will be'clear that both the extractor and the ejector are capable of movement laterally of the head, the former under spring tension, and the latter under the action of the cam surface c against the projection 0 when the bolt is retracted.

When the bolt is pushed forward against the cartridge, the firing pin is in retracted position as usual and the reduced portion of the same is then in the opening and when the hooked endot c engages the flange of the shell it is free to move laterally against the spring tension and hook over said flange. When the arm is fired the thicker part 22 of the firing pin enters the opening a and j us fills the same, so that the extractor is the held rigidly or locked against lateral movement, and by reason of this, th're is no liability of the hooked end 0' slipping from the flange of the shell, and it is held locked until in the retracting movement of the bolt, the firing pin is retracted in any well known manner so that the reduced end is then in the opening 0 and the extractor and ejector are then free to have slight lateral movement, which takes place when the projecting end 0 of the ejector strikes the cam surface e and thus moves the ejector violently aside to eject the shell from the receiver, as shown in Fig. 5, Fig. 4 representing the locked position of the extractor and firing pin.

Fig. 6 shows a modification in which the extractor and firing pin are made inone piece.

I claim v 1. In combination the breech bolt, the head having the lateral channel with side extensions at the front of the head and the combined extractorand ejector extending through the said channel, substantially as described.

2. In combination the breech bolt carrying the transverse channel and the extractor and ejector arranged therein, formed separately and connected with each other, substantially as described.

In combination the breech bolt, the'extractor movable laterally in relation to the 4. In combination the breech bolt, the two part head connected with the said bolt and -the extractor and ejector device arranged between the two members of the head, substantially as described.

5. In combination the breech bolt, carrying the transverse channel, the combined extractor and ejector having a central opening 0 and the forwardly extending arms 0' c and the firing pin adapted to pass through the opening in the extractor, substantially asdescribed.

6. In combination the breech bolt, the combined extractor-and ejector movable laterally thereof and connected with each other, said ejector havinga projecting end a and the receiver chamber E having the cam surface a to engage the end a, substantially as described.

7. In combination the breech bolt, the extractor and ejector movable laterally thereof,

said extractor, having a cylindrical part c and the eye 0, the spring in the cylindrlcal part, the forwardly extending hook c", the pin 18, the ejector having a hollow body portion fitting over the said pin and a forwardly extending arm 0 the firing pin adapted to the opening 0 and the receiver chamber having a cam surface a to operate the e ector, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

KAREL KRNKA.

Witnesses:

LADISLAR VOJACEK, ADOLPH FISCHER.