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).
The present invention provides an improved probe tip (ball) made of silicon
nitride that has a drilled cavity sized and dimensioned to receive a probe stem.
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.
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.
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.
