Gas tappet system for a rifle
First Claim
Patent Images
1. A gas tappet system for a rifle comprising:
- a gas cylinder having a longitudinal axis and a gas tube end and an open end;
a tube extending from the gas tube end of said gas cylinder having an axis parallel to and offset from the longitudinal axis, whereby said tube is adapted to mate with a gas port in the rifle;
a piston placed in the gas cylinder; and
an operating rod having a proximal end laterally slidably coupled non-coaxially to said piston and extending out of the open end of said gas cylinder, wherein a distal end of said operating rod is adapted to be coupled to a bolt carrier of the rifle,whereby an original direct gas impingement system of the rifle may be converted to the gas tappet system.
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Accused Products
Abstract
A gas tappet system for use in an M16, M4, or AR-15 type rifle having a detachable piston eccentrically connected to an operating rod. A piston having a plenum therein and a releasably attached operating rod uses combustion or propellant gasses to move the piston in a long stroke, preventing damaging impulses to the bolt carrier and cycling rounds for automatic or semi-automatic fire. The operating rod, piston, cylinder, and mounting clamp permit easy installation on the rifle without any modification and can easily be removed for reinstallation of the original direct gas impingement system.
47 Citations
18 Claims
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1. A gas tappet system for a rifle comprising:
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a gas cylinder having a longitudinal axis and a gas tube end and an open end; a tube extending from the gas tube end of said gas cylinder having an axis parallel to and offset from the longitudinal axis, whereby said tube is adapted to mate with a gas port in the rifle; a piston placed in the gas cylinder; and an operating rod having a proximal end laterally slidably coupled non-coaxially to said piston and extending out of the open end of said gas cylinder, wherein a distal end of said operating rod is adapted to be coupled to a bolt carrier of the rifle, whereby an original direct gas impingement system of the rifle may be converted to the gas tappet system.
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2. A gas tappet system for a rifle comprising:
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a gas cylinder having a longitudinal axis and a gas tube end and an open end; a tube extending from the gas tube end of said gas cylinder and offset from the longitudinal axis, whereby said tube is adapted to mate with a gas port in the rifle; a piston placed in the gas cylinder; an operating rod having a proximal end coupled non-coaxially to said piston and extending out of the open end of said gas cylinder, wherein a distal end of said operating rod is adapted to be coupled to a bolt carrier of the rifle, and wherein said piston comprises a lateral channel and said operating rod further comprises a notch adjacent the proximal end, wherein the proximal end is adapted to mate with the lateral channel, whereby an original direct gas impingement system of the rifle may be converted to the gas tappet system. - View Dependent Claims (3, 4)
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5. A replacement gas tappet system for a rifle comprising:
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a cylinder having an open end, an end wall, and a first longitudinal axis; a gas tube having a second longitudinal axis mounted on the end wall, wherein the first longitudinal axis is offset from the second longitudinal axis, said gas tube having an opening adapted to mate with a gas port in a barrel of the rifle; a piston placed within said cylinder, said piston having a plenum on one end and a lateral channel and a flat portion between the lateral channel and the other end; an operating rod having a proximal end notch on a proximal end, the proximal end adapted to mate with the lateral channel and the flat portion in said piston adapted to mate with the proximal end notch, a distal end of said operating rod connected to a bolt carrier of the rifle; and a mounting clamp attached to said cylinder and a barrel of the rifle, whereby an original direct gas impingement system of the rifle may be replaced with the replacement gas tappet system. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A gas tappet system for replacing a direct gas impingement system used for automatically cycling a round in a rifle comprising:
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a cylinder having an end wall, an open end, and a first longitudinal axis; a cylinder sidewall partial cutaway adjacent the open end of said cylinder; a cylinder latch slot formed in said cylinder; a plurality of gas ports formed in said cylinder intermediate the end wall and the open end; opposing cylinder flat portions placed on exterior walls of said cylinder; a bottom cylinder flat placed between said opposing cylinder flat portions; a gas tube having a second longitudinal axis mounted on the end wall of said cylinder, wherein the first longitudinal axis is offset from the second longitudinal axis, said gas tube having an opening adapted to mate with a gas port in a barrel of the rifle; a piston placed within said cylinder, said piston having a plenum on one end and a lateral channel and a flat portion between the lateral channel and the other end; an operating rod having a proximal end notch on a proximal end, the proximal end adapted to mate with the lateral channel and flat portion in said piston; a carrier key receiving the distal end of said operating rod, the distal end of said operating rod having a distal end notch; a rod lock having a key adapted to fit within the carrier key and the distal end notch of said operating rod and a stem adapted to fit within a hole in the bolt carrier of the rifle; a mounting clamp attached to said cylinder and the barrel of the rifle, said mounting clamp comprising, a bottom clamp pivoted arm fixed by a screw; side walls forming a U-shape having an intermediate ridge adapted to receive the bottom cylinder flat; a clamp latch slot formed in one of said side walls; a latch adapted to fit through said clamp latch slot; and a handle attached to said latch and pivoting on said mounting clamp, said handle having a first, second, and third position, wherein in the first position said latch extends through said clamp latch slot and through said cylinder latch slot preventing said piston from passing, and in the second position said latch does not extend beyond said cylinder latch slot permitting said piston to pass, and in the third position said latch does not extend beyond said clamp latch slot permitting said cylinder to be removed from said mounting clamp, whereby an original direct gas impingement system of the rifle may be modified with the replacement gas tappet system without any permanent modifications to the rifle. - View Dependent Claims (16)
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17. A gas tappet system for a rifle comprising:
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a gas cylinder having a longitudinal axis and a gas tube end and an open end; a tube extending from the gas tube end of said gas cylinder, whereby said tube is adapted to mate with a gas port in the rifle; a piston placed in the gas cylinder; a front plenum placed in a front end of said piston; an operating rod having a proximal end laterally slidably coupled to said piston and extending out of the open end of said gas cylinder; a carrier key attached to a bolt carrier of the rifle; and said operating rod having a distal end, the distal end attached to said carrier key, whereby said piston, said operating rod, said carrier key, and the bolt carrier move as a unit reducing a striking force on the bolt carrier. - View Dependent Claims (18)
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Specification