US2708803A - Ejector device for automatic firearms with revolver drums - Google Patents

Description

May 24, 1955 T. SCHNEIDER EJECTOR DEVICE FOR AUTOMATIC FIREARMS WITH REVOLVER DRUMS Filed March 22, 1951 W. H k

3M rfiu Na, 5 v@ R N an IM 1 I 7'4 2 l m 5 W 4 w V .a BME 9 m 2 5 m l M b r/W P 4 States Patent EJECTOR DEVKCE FOR AUTOMATIC FIRE WITH REVOLVER DRUMS Theodor Echneider, Zurich, Switzerland, assignor to Machine Tool Works Oerlikon, Administration Company, Zurich-Berlikon, Switzerland, a company of Switzerland Application March 22, 1951, Serial No. 216,863

2 Claims. (CI. 4268) The present invention relates to an ejector device for automatic firearms with a revolver drum rotated by a longitudinally movable gas-operated slide.

The device according to the present invention is characterized in that on the gun casing an ejector lever is pivotally disposed, one arm of which engages the extractor groove of the cartridge case to be ejected and which has two lugs engaging with recesses and stops on the longitudinally movable slide whereby the pivoting of the ejector lever and locking of the same in its end positions is effected.

In the enclosed drawing two constructional examples of the present invention are shown. In the drawing:

Fig. l is a. diagrammatic longitudinal section through the gun;

Fig. 2 is a diagrammatic longitudinal section through the gun immediately after the firing of a shot, showing the revolver drum and the ejector lever in elevation;

Fig. 3 is a section through the ejector device in normal position along the line IIIIII of Fig.

Fig. 4 is a section through the ejector device in ejection position;

Fig. 5 is a section along the line VV in Fig. 2;

Fig. 6 is a section through the ejector device of a second example;

Fig. 7 is a plan view of the slide at the position of engagement of the ejector lever as shown in Figs. 3, 4 and 6.

As shown in Figs. 1 and 2 the barrel 1 is fastened by means of a bayonet connection to the casing 2 which contains the drum 3. The drum 3 is fitted with a number of cartridge chambers which on rotation of the drum 3 are successively moved in front of the barrel 1. Rotation of the drum 3 is effected in known manner by means of a slide 4 fitted with curved grooves which engage the rollers 5 disposed on the drum. The slide 4 is actuated by the gas piston 6 arranged in the gas cylinder 7. The cartridge feed star wheel 9 is arranged coaxial to the drum 3 and connected with the latter by the coupling 8. The cartridges are moved in known manner in two steps from the star wheel into the cartridge chambers of the drum 3 by means of the lugs 10, 11 of the slide 4.

The ejector lever 13 shown in Figs. 3 to 6 is pivotally arranged on the pin 14 in the casing and is controlled by the slide 4. The latter is fitted with two grooves 15 which are engaged by the fork-shaped lugs 16 of the ejector lever 13 and a further groove 17 engaged by the lug 18. The arm 19 of the ejector lever 13 is provided for engaging the extractor groove of the cartridge cases.

Operation of the device is as follows: During rotation of the drum 3 the ejector lever is in the normal position shown in Fig. 3. Just before the advancing slide 4 has reached its forward end position the two end faces 20 of the grooves 15 impact upon the lugs 16 of the ejector lever and initiate pivoting of the latter. Since the drum 3 has already reached its end position at this moment the arm 19 of the ejector lever is already engaging the extractor groove of the empty cartridge case and starts pulling the case out of the chamber. Due to the further movement of the slide the ejector lever 13 is pivoted until its lugs 16 rest against the top face 21 of the slide 4. The lug 18 thus engages the groove 17 (cf. Fig. 4). The ejector lever now remains in this position until the slide starts moving backward after firing of the next round. The lug 18 is then hit by the end face 22 of the groove 17 whereupon the ejector lever is positively returned to its normal position (Fig. 3) and held in this position by the lug 18 resting against the top face 21 of the slide 4. This sequence of operation is repeated on firing of the next round.

It should be noted that the ejector lever 13 is located in the position shown in Fig. 3 before the cartridge in the drum has reached the ejection position. Thus the empty cartridge casing in the drum is directly turned upon the ejector.

In the example shown in Fig. 6 a spring 23 with plunger 24 is provided which tends to move the ejector lever 13 into either one of its end positions. It is thus unnecessary to provide a positive guidance of the ejector lever 13. The examples described are, of course, only two out of many possibilities for practical realization of the inventive thought.

I claim:

1. An ejector device for an automatic firearm having a casing, a gas-operated slide longitudinally-reciprocating in said casing, a revolver drum adapted to carry cartridges and rotated by said slide, the cartridges being of the type having extractor grooves formed at the ends thereof and located beyond said drum when the cartridges are mounted in the drum, said ejector device comprising an ejector lever pivoted upon the casing and swingable in the direction of movement of said slide and having an arm fitting in the extractor groove of the cartridge being ejected, and two lugs, each of said lugs fitting into a recess formed in said slide, said slide having stops engaging said lugs to swing said lever in opposite directions during a reciprocating movement of said slide, whereby said arm of the lever pulls the cartridge out of the drum and ejects it during one of the swinging movements.

2. A device in accordance with claim 1, comprising a spring pressing said lever toward one of its end positions.

References Cited in the file of this patent UNITED STATES PATENTS 59,706 Bourderaux Nov. 13, 1866 206,475 Morrison July 30, 1878 408,453 Boesch Aug. 6, 1889 794,852 Clarke July 18, 1905 863,171 Hamilton Aug. 13, 1907 1,387,460 Beets Aug. 16, 1921 2,353,118 Schirokauer July 4, 1944

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