Abstract: A shoe assembly with a retractable fin assembly that moves between two extreme positions. One of the positions is the retracted position with the fin assembly housed within a longitudinally and transversely extending cavity along the shoe's sole. The other extreme position for the fin assembly being distended outside the sole for maximum propulsion use in a body of water. Resilient support members are mounted to the lateral sides of connecting flexible web portions. A releasable fastening mechanism with a stopper for the smallest support member causes the web portions to stay taut.

Abstract: An electrical delay detonator for use in blasting initiation systems energized by a non-electric impulse signal transmitted through a non-electrical conduit, such as a shock tube, with one end inserted inside a detonator housing having redundant sensors for detecting the presence of a non-electric impulse signal and a computerized control circuit for actuating the firing circuit. An elevated voltage is generated, stored in a capacitor assembly, and discharged when fired to an electrically operable igniter. The igniter, when activated, detonates an explosive mass. A battery is also contained within the detonator housing for powering the control circuit and one sensor, in low consumption mode, for several days. Upon detecting the presence of a signal the rest of the circuits are powered up. Periodic time windows generated by the control assembly provide corresponding enabled time periods for the sensors to become operational.

Abstract: This system includes support pieces (1, 1a) intended to be permanently fixed to the structure of the construction, interchangeable supports (30) fitted with a fixing device (4) for attachment to any of the support pieces (1, 1a) and with means of attachment for safety devices or load-bearing devices, intermediate supports (5, 14, 18) that can be coupled to the interchangeable supports and safety elements that can be coupled to the intermediate supports and/or the interchangeable supports. These protective elements include: head pieces (6) of lifelines, modular masts, angled brackets for attaching safety nets (9), protective canopies, safety guard masts (15), telescopic baseboards (16), extendible railings (17) and auxiliary railings (19).

Abstract: A method for making gravel filters in oil well bores. The first step involves ascertaining the location of a producing formation adjacent to a cemented casing in a well bore. Then, a portion of the casing adjacent to the producing formation is cut, enlarging the bore adjacent to the producing formation. Subsequently, a sufficient amount of gravel is deposited in the enlarged portion of the bore to create an effective filter for a producing tube with a screen at its distal end. The distal end is positioned adjacent to the cemented bottom of the well bore. The method maximizes the diameter of the gravel deposited by delivering it exteriorly of the screen of the producing tube and through the annular space defined and sealed between the screen and the casing.

Abstract: Device designed to desalinate brackish water which performs said function by the combined action of magnetic fields generated inside the device and ion-selective membranes, thus obtaining two separate water currents, one with a low salt concentration and the other reject current with a high salt concentration. It comprises an external cylindrical body of magnetized iron (1), an inner body also cylindrical and made of the same material (2) and an intermediate chamber (3) in which are placed a series of ion-selective membranes (6 and 7) arranged radially around the axle common to all of the bodies, and placed alternately such that each negative-ion selective membrane has a positive-ion selective membrane on either side.

Abstract: An explosive emulsion to be used in conjunction with a gas-producing agent, such as sodium nitrite, to form an explosive emulsion with a density between 0.50 g/cm3 and 0.90 g/cm3. The present invention also includes the method for producing the explosive emulsion. The explosive emulsion is stable for at least 96 hours with nitrogen bubbles, having a predetermined dimension range, homogenously distributed. To maintain this low-density explosive emulsion stable, between 84% and 95% by weight of an oxidizing solution is combined with 5% to 16% by weight of a fuel solution. The fuel solution includes solid cacao fat as a stabilizing agent and stearic acid to prevent the combination of the nitrogen bubbles. The method for producing the oxidizing solution includes combining ammonium nitrate, sodium nitrate, thiourea, urea, and water at a temperature between 80 and 90 degrees centigrade. In another step of the method, a fuel solution is produced by combining an emulsifier, oil, diesel No.

Abstract: A collapsible container that in the assembled configuration provides for a predetermined central space protected by six walls that are perpendicularly mounted with respect to each abutting wall and in the e collapsed configuration occupies minimum space. A bottom wall is provided with a predetermined umber of hinge knuckles with a central through opening through which pins are passed. Parapets of different heights are provided to raise the knuckles to predetermined heights that will clear the stacked up thickness of the folded walls. The height of the front, rear and the two side lateral walls is determined by the width of the bottom wall which in turn will also determine the width and height of the front and rear walls. A handle is removably mounted to the top wall, protruding toward the exterior.

Abstract: A battery contact terminal assembly for electrically connecting the conducting end of a cable to a battery post so that the mechanical and electrical connection can be effectively ensured. The assembly includes two hingedly mounted members with semicircle ends each that embrace the post when a fastening member tightens the free ends. The fastening members include a hook that pulls the conducting end against one of the members. An anti-corrosion member is sandwiched between the two free ends for protection against the electrolyte chemical reaction typical in batteries.

Abstract: A saxophone having a body, a neck including a plurality of keys mounted thereon, each of said keys including an actuating surface and a bell including a valve protector, the improvement comprising a system for controlling the tension and travel of a saxophone player's fingers of both hands with a right hand device and a left hand device. The right hand device has an anchorage assembly mounted to the valve protector and a travel stopper elongated portion integrally extending from the anchorage assembly and kept at a substantially parallel and spaced apart relationship with respect to an actuating surface's plurality of keys thereby limiting the extension movement of a user's fingers as he or she actuates the keys. The left hand device includes an elongate stopper member with anchorage assemblies at its ends. The left hand device is rotatably mounted to facilitate its storage in storage cases.

Abstract: A foot brace assembly for immobilizing a user's foot while providing some degree of flexibility through independent shock absorbers that avoid drastic application of loads to the user's foot. A top shoe assembly is coupled through spring members to a bottom shoe assembly that has slightly larger dimensions to receive the top shoe assembly. The underside of the bottom shoe assembly includes rear, middle, and front assemblies that are independent from each other and are compressed depending on the user's gait. The underside of the shoe assembly includes perpendicularly mounted upper tubular members that telescopically receive and guide corresponding lower tubular members that are perpendicularly mounted to the upperside of the sole assembly. The lower tubular members are mounted to depressed walls below the sole assembly's upperside to reduce the effective separation of the shoe and sole assemblies while providing a sufficient guiding distance.

Abstract: The invention relates to gypsum mortar with expanded vermiculite added with citric acid and tartaric acid and to the method for obtaining same, containing the following elements in the following proportions: between 40% and 70% calcium sulphate; between 40% and 70% laminated expanded vermiculite; between 0.05% and 0.3% citric acid; between 0.05% and 1% tartaric acid; between 0.01% and 0.5% sodium or potassium citrate; and water q.s.p. 1000 ml, in which, for surface coating, the added vermiculite is obtained following treatment in a vertical furnace, which provides improved grain size and sheets of exfoliated vermiculite without water or air, and the mortar is provided with citric acid and tartaric acid, copper sulphate and sodium or potassium scitrate, with the water being added before the mixture is produced.

Abstract: A urine collector for females that use a frustropyramidal funnel member with a narrow end that has a rhombus-shape cross-section that a user can deform to fit a cooperating locking assembly with a frustropyramidal through aperture. As the deforming pressure on the folds of the funnel member is released, the outer walls of the narrow end of the funnel engage the internal walls of a frustropyramidal central through aperture in the locking assembly keeping the funnel member in place. The locking assembly can be integrally built in the collecting container or in a separate closure locking assembly.

Abstract: A walker with wheels that are retracted upon the application of a force of predetermined magnitude to permit a user to move the walker when he or she partially leans on the walker while providing a solid anchored support if he or she leans with more weight exceeding a predetermined magnitude. The walker includes a structural elongated assembly with a handle and forearm cuff at one end. The other end is rigidly mounted to two base assemblies that are kept at a parallel and spaced apart relationship with respect to each other. The base assemblies have a bottom surface. Retractable wheels are mounted to the base assemblies. The wheels are spring biased to protrude beyond the bottom surface so that they support the walker when at rest and as long as the user does not apply a force that exceeds a predetermined magnitude.

Abstract: A fishing rod holder with automatic pull that operates unattended and automatically pulls when a force of predetermined magnitude is applied to the line. The holder includes a housing where an assembly for removably holding a fishing rod is pivotally mounted and movable between two extreme positions. The housing includes a stopper member cooperatively mounted outwardly to coact with the locking mechanism. A spring assembly biases the holder assembly towards the rearmost extreme position and a locking assembly for releasably holding the rod holder keeps the latter at the foremost extreme position. A trigger sensing the tension of the fishing line is automatically actuated by exceeding a predetermined tension magnitude causing it to pivot and transmit a rotational movement to an elongated member. The other end of the elongated member includes a spring biased retractable chamfered pin. The pin has a slanted termination and a flat termination.

Abstract: A holder for compound tray and tools that includes a flexible sheet assembly that is removably mounted to a belt positioned around a user's waist. The sheet assembly includes a number of pockets with magnets designed for holding tools inside. Reinforcement members are mounted to the upper and lower edges of the sheet assembly to hold the sheet assembly in an extended position yet there are no reinforcement members along the lateral edges to still permit some flexibility of the sheet assembly. A tray holder assembly is mounted to the reinforcement adjacent to the lower edge. A tray holder supporting assembly, like cords, keeps the tray holder in a substantially horizontal position. Magnetic elements that are mounted to the tray and tray holder cause the tray to come toward the tray holder providing stability to the structure. Locking members can also be removably mounted to the tray and tray holder assembly to keep them together.

Abstract: The invention relates to an improved self-cleaning filter for agricultural irrigation water having a support base (8) for the rings (3) traversed by perforated tubes (4) which clean them, allowing the axial movement of the tubes (4) having an integral upper cover (5) at the opposite end which presses them in an axial direction, whereas the lower base (6), also integral thereto, generates the axial thrust to separate and press them, acting as a blocker and allowing the flow path to the perforated tubes (4); incorporating a base (9) acting as a membrane and a spring pressing on the rings (3), with an adjustable separation and variable in number.

Abstract: A method to play wave surfing comprising sliding one magnetic figure holder over a coated wave wall by magnetically engaging the figure holder to one magnetic handle and by manipulating the magnetic figure holder with the magnetic handle to avoid the detachment of the magnetic figure holder while at the same time avoiding obstacles placed on said coated wave wall. A surfing board game comprising, at least one wave wall, at least one magnetic handle, the handle further comprising at least one magnet within the handle and at least one magnetic figure holder, the holder further comprising at least one magnet that is placed within the figure holder, further comprising at least action figure that is placed on the magnetic figure holder. Where the magnetic figure holder is slidably placed onto said wave wall and is magnetically coupled to the magnetic handle to create at least one game level of difficulty.