A tension management system employs moveable anchors, tension pins, ports and tuning string within torsion spring and cam elastic energy storage and deployment counteracting block and tackle systems. In conjunction with prescribed methods, launching cords and cables can be installed and replaced in field conditions, with precise tension for dynamic balance, without the need for bulky and expensive external presses.

An auxiliary catapult device of a grenade contains: a throwing tube, a launch unit, and a trigger unit. The throwing tube includes an outlet, a shoulder, a throwing object, two slots, a through orifice, and a first connection portion, wherein the throwing object has a safety lever. The launch unit includes a piston, a first spring, a piston rod, and a pull bar, wherein the piston has a passing orifice, and the piston rod has a receiving orifice and an engagement portion. The trigger unit includes a seat, a button, two retainers, and two second springs, wherein the seat has an accommodating space, an opening, and a second connection portion. The second connection portion of the seat is connected with the first connection portion of the throwing tube. The button has a notch, and each retainer has a hook and a tilted contact portion.

An auxiliary catapult device of a grenade contains: a throwing tube, a launch unit, and a trigger unit. The throwing tube includes an outlet, a shoulder, a throwing object, two slots, a through orifice, and a first connection portion, wherein the throwing object has a safety lever. The launch unit includes a piston, a first spring, a piston rod, and a pull bar, wherein the piston has a passing orifice, and the piston rod has a receiving orifice and an engagement portion. The trigger unit includes a seat, a button, two retainers, and two second springs, wherein the seat has an accommodating space, an opening, and a second connection portion. The second connection portion of the seat is connected with the first connection portion of the throwing tube. The button has a notch, and each retainer has a hook and a tilted contact portion.

A device for launching a projectile along an intended flight trajectory includes a launching mechanism. The launching mechanism includes first and second pairs of supports supporting a launching cord. A projectile having a longitudinal axis is disposed in the launching cord in a launch position prior to launch such that the projectile's longitudinal axis is perpendicular to a plane in which the launching cord is disposed. As the projectile is launched by the launching mechanism, the projectile rotates such that the projectile's longitudinal axis is parallel to the plane in which the launching cord was disposed.

A device for launching a projectile along an intended flight trajectory includes a launching mechanism. The launching mechanism includes first and second pairs of supports supporting a launching cord. A projectile having a longitudinal axis is disposed in the launching cord in a launch position prior to launch such that the projectile's longitudinal axis is perpendicular to a plane in which the launching cord is disposed. As the projectile is launched by the launching mechanism, the projectile rotates such that the projectile's longitudinal axis is parallel to the plane in which the launching cord was disposed.

A firing system for a crossbow having an arrow rest extending along an arrow rest axis, the firing system having a right limb and a left limb, the right limb being pivotable about a right limb axis and the left limb being pivotable about a left limb axis, the firing system further including a right cam and a left cam, the right cam having a right bow string groove and being rotatable about a right cam axis, the left cam having a left bow string groove and being rotatable about a left cam axis, the firing system having a bow string extending between the right and left cams and extending within the right and left bow string grooves, the bow string positionable between an un-cocked condition and a cocked or full draw condition wherein movement of the bow string from the un-cocked condition toward the cocked condition moves the right and left cams toward each other and pivots the right and left limbs about the right and left limbs axes respectively, the firing system further including a power assembly having a power cable and a spring assembly, the power cable having a forward end operably joined to the right and left limbs and a rear end operably joined to the spring assembly, the spring assembly having a power spring extending along a power spring axis between a first spring end and a second spring end and having a central spring opening, the power spring being below the arrow rest, the power cable extending through the central spring opening from the first spring end toward the second spring end, the rear end of the power cable being operably joined relative to the second spring end of the power spring, moving the bow string from the un-cocked condition to the cocked condition causing the right and left limbs to the pull forward end of the power cable forwardly wherein the operable engagement with the second spring end compressing the power spring by pulling the second spring end toward the first spring end to produce the shooting force to propel the archery arrow.

A tension management system employs moveable anchors, tension pins, ports and tuning string within torsion spring and cam elastic energy storage and deployment counteracting block and tackle systems. In conjunction with prescribed methods, launching cords and cables can be installed and replaced in field conditions, with precise tension for dynamic balance, without the need for bulky and expensive external presses.

An elastic energy storage and deployment system deploys a torsional spring that bias a cam connected to a cable. The cam is coupled to the torsion spring about a shared rotational axis such that the cam directs elastic energy to and from the torsion spring and the cable transforms rotational force into linear motion, with little rotational inertia, and the addition of angular acceleration.

A toy gun having embedded magazine includes: a gun body having a bullet feeding slot; a top magazine cover pivotally connected at a top end of the gun body and having an accommodating slot and a first latching structure disposed on one side facing the gun body, the first latching structure is located at one lateral side of the accommodating slot; and a magazine assembly detachably disposed in the accommodating slot and having a main body, the main body has a bullet discharging funnel and a second latching structure, the second latching structure is correspondingly latched with the first latching structure; when the top magazine cover pivotally rotates from top to down to cover on top of the gun body, the bullet discharging funnel is correspondingly disposed in the bullet feeding slot. Accordingly, the magazine is embedded and hidden in the top magazine cover.

An ejection launcher is an apparatus that effectively ejects a payload while maintaining a compact structure. The apparatus includes an elongated enclosure, a cover, a trigger mechanism, a spring-loaded piston, and a payload. The elongated enclosure positions and connects the trigger mechanism with the spring-loaded piston. The elongated enclosure also houses the spring-loaded piston and the payload. The trigger mechanism releases the spring-loaded piston which forces the payload from within the elongated enclosure. The payload is a desired delivered item and is preferably a parachute. The trigger mechanism and the spring-loaded piston translates horizontal force into vertical force which releases the payload and reduces the release resistance. The trigger mechanism preferably utilizes and includes a servo motor with a output arm. The output arm pushes against a catch plate of the trigger mechanism and releases a catch pin of the spring-loaded piston.