An electronic educational game (1) comprising a learning aid (10) that is adapted to receive and identify a lesson card (20), and to subsequently accept user input and to provide responses. The responses provided are at least partially determined by the identity of the lesson card. The identity is determined by using an optical code reader (200), that is part of the learning aid, to read a plurality of optical code strips (210) on the lesson card.
A blowgun has a movable mouthpiece coupled to a barrel, wherein a soft, and preferably fluid-soaked projectile is inserted into the barrel through the mouthpiece via a continuous channel that is formed by the mouthpiece and the barrel. After loading of the projectile, the channel is closed by moving the mouthpiece relative to the barrel.
A fiying toy has a leader portion defining an opening, and a supple tail portion defining an inlet and outlet, wherein when the toy is fiying in air, the air enters through the inlet and exits through the outlet. Also, a center of gravity of the toy is within the leader portion. Furthermore, the thickness of the tail portion is not more than 1 mm, or even 0.5 mm.
A fiying toy has a wing having a leading edge, a first end, and a second end. A ballast element is coupled to the first end of the wing, and a launcher receiver element that receives a launcher is coupled to the ballast element.
A collapsible chair having a backrest, at least one backrest support rod, and a backrest rod anchor coupling the backrest to the backrest support rod, wherein the backrest rod anchor comprises a rod end receiving portion coupled to a backrest attachment portion, the backrest support rod is at least partially enclosed by the rod end receiving portion of the backrest rod anchor, and the backrest is attached to the backrest attachment portion of the backrest rod anchor.
An apparatus comprises a movable lock ring and a lock ann that prevents inadvertent movement of the lock ring. Contemplated configurations are especially useful in delayed coking vessels to prevent opening of the vessel while the vessel is in operation.
Methods and apparatus are provided in which a collapsible rocking chair has legs that translate towards and away from each other to configure the chair between open and collapsed dispositions, and at least one leg that slidably articulates with a rocker. Preferred embodiments have four legs. The left back leg slidably articulates with a left rocker, and the right back leg slidably articulates with a right rocker. The front legs are pivotally coupled to the respective rockers at fixed points. The back frame is preferably coupled to the left and right legs at pivots, allowing the back to approximate the seat during folding. Both back and seat are preferably formed from a fabric material, and more preferably from a single continuous piece of fabric. Preferred rocking chairs also include left and right annrests, supported at least in part by the back frame.
A collapsible chair (10) has a first (110) and second (112) front leg, a rear leg (120), a seat support rod (130), and a backrest is attached to the front legs. The legs and the seat support rod are coupled via cross braces (140, 150) such that the seat support rod pivots in one direction while the rear leg pivots in the opposite direction when the front legs are approximated to each other. Preferred chairs comprise a seat that is tensioned when the front legs move apart, and the seat remains substantially tensioned when the seat supports a person.
Apparatus and Methods for Shielding High-pressure Fluid Devices
A high-pressure device has a drill stem (242) with a drill head (244) delivering a high-pressure fluid jet. A shield (246) is movably coupled to the device, wherein the drill head (244) is at least partially enclosed by the shield (246) when the drill head (244) is removed from the container (23).
Apparatus, compositions and methods provide cathodic protection to a structure by placing an anode layer (10) directly between the structure (22) and its underlying foundation (30). Structures contemplated to be protected in this manner include especially very large structures such as above ground storage tanks. In one aspect of preferred embodiments, the anode layer (10) comprises sheets of at least 85% aluminum with other alloying elements such as magnesium (0.05 to 6%), zinc (0.1 to 8%), indium (0.005 to 0.03%) and tin (0.05 to 0.2%) added for the purposes of optimizing current yield, polarization and ease of manufacturing the sheet.
A fire barrier for use in dynamic voids to seal against the spread of fire. Flexible foil-backed insulation material is supported by a woven metallic support screen positioned in the void. As the surfaces defining the void undergo relative movement, the ability of the individual wire elements of the screen to move in a scissor-like fashion relative one another allow the screen to distort laterally without shearing, wrinkling, or buckling while the insulation material floating thereon is effectively isolated from any shear forces. The foil backing allows the insulation to freely shift relative the support screen.