| 主权项 |
1. An automatic air rifle capable of automatic and semiautomatic fire comprising:
a receiver; a hollow limit member secured to a rear portion of the receiver; a spring-actuated cup member disposed in the limit member; an elongated cavity disposed in the receiver; a receptacle disposed at a front end of the cavity; an air chamber disposed at a rear end of the cavity; a fire control selector rotatably mounted on the receiver, the fire control selector being configured to rotate to point to a safe position, a semi-automatic position, or a fully automatic position; a cam member disposed in the receiver and co-rotated with the fire control selector; a first spring-biased member disposed to the left of the cam member; a second spring-biased member disposed to the right of the cam member; a spring-biased trigger pivotably secured to the receiver; a spring-biased pivotal member partially disposed in the trigger; a charging handle retractably disposed in the receiver; a front sliding sleeve disposed in a forward portion of the cavity and including an upper recess at a rear end and a lower recess under the upper recess; a main biasing member secured to the front sliding sleeve and the charging handle respectively; a roller rotatably disposed in the cavity; an L-shaped rod disposed in the cavity; a rear stop member disposed at an end of a short part of the L-shaped rod and between the cam member and the second spring-biased member; a front stop member disposed at an end of a long part of the L-shaped rod; a rear diversion channel formed through the front sliding sleeve; a rear sliding sleeve disposed rearward of the front sliding sleeve and including a spring-biased, pivotal upper hook and a spring-biased, pivotal lower hook; a main tube disposed through the rear sliding sleeve and having a rear end slidably disposed in the cup member, and a front end fastened in the front sliding sleeve, the main tube including a rear inlet and an annular flange disposed forwardly of the rear inlet; a gas piston disposed forwardly of the main tube and partially in the front sliding sleeve, the gas piston having a front end disposed in the receptacle; a magazine releasably secured to the receiver and including a column for storing at least one pellet wherein one of the at least one pellet is pushed to contact an outer surface of the front end of the gas piston; a barrel having a rear end communicating with the front end of the gas piston; an inlet member formed at a rear end of the gas piston; and an auxiliary biasing member put on the main tube and biased between the front sliding sleeve and the rear sliding sleeve; wherein in response to rotating the fire control selector to the semi-automatic position, the cam member is disposed perpendicular to both the first and second spring-biased members, the rear stop member is not urged by the cam member, a pulling of the charging handle pulls the front sliding sleeve to be proximate the main tube, the gas piston moves rearward to allow one of the at least one pellet to enter the receptacle, the main biasing member expands, the upper hook lockingly engages the upper recess, the lower hook lockingly engages the lower recess, the auxiliary biasing member compresses, a releasing of the charging handle compresses the main biasing member to push both the front and rear sliding sleeves forward, the gas piston moves forward to push one of the at least one pellet into a rear end of the barrel, the upper hook is pressed by the roller in the forward movement of the rear sliding sleeve to disengage from the upper recess, a pulling of the trigger counterclockwise rotates both the pivotal member and the lower hook to unlock the front sliding sleeve, the auxiliary biasing member expands to push the rear sliding sleeve rearward, the main tube moves rearward to compress the cup member until the flange contacts the limit member and the rear inlet communicates with the air chamber, pressurized gas flows through the barrel via the air chamber, the rear inlet, the main tube, and the gas piston to discharge one of the at least one pellet out of the barrel, a portion of the pressurized gas flows into the diversion channel to push the front sliding sleeve rearward by compressing the auxiliary biasing member and expanding the main biasing member, the gas piston moves rearward to allow a next one of the at least one pellet to enter the receptacle, a stop of flowing the pressurized gas pushes the cup member forward to disengage the rear inlet from the air chamber, the upper hook lockingly engages the upper recess, the lower hook lockingly engages the lower recess, a pulling of the trigger counterclockwise rotates the pivotal member and moves the pivotal member along an outer surface of the lower hook without counterclockwise rotating the lower hook, the main biasing member compresses to push the rear sliding sleeve forward and compress the auxiliary biasing member, the upper hook is pressed by the roller in the forward movement of the rear sliding sleeve to disengage from the upper recess, and a release of the trigger clockwise rotates the pivotal member to disengage from the lower hook to dispose the trigger in a ready position; and wherein in response to rotating the fire control selector to the fully automatic position, the cam member is disposed perpendicular to both the first and second spring-biased members, the rear stop member is not urged by the cam member, a pulling of the charging handle pulls the front sliding sleeve to be proximate the main tube, the gas piston moves rearward to allow one of the at least one pellet to enter the receptacle, the main biasing member expands, the upper hook lockingly engages the upper recess, the lower hook lockingly engages the lower recess, the auxiliary biasing member compresses, a releasing of the charging handle compresses the main biasing member to push both the front and rear sliding sleeves forward, the gas piston moves forward to push one of the at least one pellet into a rear end of the barrel, the upper hook is pressed by the roller in the forward movement of the rear sliding sleeve to disengage from the upper recess, a pulling of the trigger counterclockwise rotates both the pivotal member and the lower hook to unlock the front sliding sleeve, the auxiliary biasing member expands to push the rear sliding sleeve rearward, the main tube moves rearward to compress the cup member until the flange contacts the limit member and the rear inlet communicates with the air chamber, first pressurized gas flows through the barrel via the air chamber, the rear inlet, the main tube, and the gas piston to discharge one of the at least one pellet out of the barrel, a portion of the first pressurized gas flows into the diversion channel to push the front sliding sleeve rearward by compressing the auxiliary biasing member and expanding the main biasing member, the gas piston moves rearward to allow a next one of the at least one pellet to enter the receptacle, a stop of flowing the first pressurized gas pushes the cup member forward to disengage the rear inlet from the air chamber, the upper hook lockingly engages the upper recess, the lower hook lockingly engages the lower recess, the main biasing member compresses, the auxiliary biasing member compresses to push the rear sliding sleeve forward, the upper hook is pressed by the roller in the forward movement of the rear sliding sleeve to disengage from the upper recess, a pulling of the trigger counterclockwise rotates both the pivotal member and the lower hook to unlock the front sliding sleeve, the auxiliary biasing member expands to push the rear sliding sleeve forward, the upper hook is pressed by the roller in the forward movement of the rear sliding sleeve to disengage from the upper recess, the pivotal member pivotably pushes the lower hook to disengage from the lower recess, the auxiliary biasing member expands to push the rear sliding sleeve rearward, the main tube moves rearward to compress the cup member until the flange contacts the limit member and the rear inlet communicates with the air chamber, second pressurized gas flows through the barrel via the air chamber, the rear inlet, the main tube, and the gas piston to discharge one of the at least one pellet out of the barrel, a portion of the second pressurized gas flows into the diversion channel to push the front sliding sleeve rearward by compressing the auxiliary biasing member and expanding the main biasing member, the gas piston moves rearward to allow a next one of the at least one pellet to enter the receptacle, a stop of flowing the second pressurized gas pushes the cup member forward to disengage the rear inlet from the air chamber, the upper hook lockingly engages the upper recess, the lower hook lockingly engages the lower recess, the main biasing member, the main biasing member expands, the auxiliary biasing member compresses, and both the front and rear sliding sleeves move forward to dispose the trigger in the ready position. |
