Abstract: A skate wheel axle engages a removable skate wheel mounted on a rotational bearing support and is held in place by a wheel fastener such as a nut. A wheel cover mounting receives a wheel cover. The wheel cover is removably engaged with the cover mounting means by corresponding first and second part engagement threads.

Abstract: A backstop for decelerating and trapping projectiles generally includes a support structure having an inclined surface and a projectile trapping medium disposed on the inclined surface. The projectile trapping medium may be either a resilient granular ballistic medium or a combination of a ballistic medium with a hydrated super absorbent polymer (SAP) gel. Preferably, the support structure is made of a shock absorbing, foamed, fiber-reinforced concrete, such as SACON®. In embodiments, the support structure also includes an enclosure. Additives may also be mixed into the projectile trapping medium to control alkalinity and prevent leaching of heavy metals.

Abstract: Provided are structural material for bullet traps and the like, a method of producing it, and a structure comprising it. The material is suitable for entraining and immobilizing projectiles and fine particles in a sticky gel. It is prepared by mixing cement with a thickener to form a dry mixture. Water is mixed with a fine aggregate in a mixer. The dry mixture is combined with the aqueous mixture in the mixer to form a slurry. Calcium phosphate and an alumina compound are added, mixing each separately until homogeneous. The density of the mixture is measured and an aqueous foam is added to adjust the density to a pre-specified level. Fibers are mixed into the adjusted mixture to form a homogeneous slurry that may be poured into a mold or in place at a construction site. Upon curing, the material may be used as a structural component.

Abstract: Provided are an improved structural material for bullet traps and the like, a method of producing it, and a structure comprising it. The material is suitable for entraining and immobilizing projectiles and fine particles in a sticky gel. It is prepared by mixing cement with a thickener to form a dry mixture. Water is mixed with a fine aggregate in a mixer. The dry mixture is combined with the aqueous mixture in the mixer to form a slurry. Calcium phosphate and an aluminum compound are added, mixing each separately until homogeneous. The density of the mixture is measured and an aqueous foam is added to adjust the density to a pre-specified level. Fibers are mixed into the adjusted mixture to form a homogeneous slurry that may be poured into a mold or in place at a construction site. Upon curing, the material may be used as a structural component.

Abstract: A mat for covering soil comprising a lower fabric layer, an upper fabric layer superimposed over the lower fabric layer, and a water absorbing material interposed between said lower fabric layer and upper fabric layer. The mat contains tubular segments containing fabric and hydraulically setting cement. The cover, when wetted, becomes ballasted by the absorbed water and the tubular elements harden to form rigid ribs that hold the mat in conformity with the surface of the underlying soil.

Abstract: Tapered bags are dispensed singly from a nested configuration. They may be made of plastic, paper, aluminum foil, or aluminum foil laminated with plastic. The bags are connected at the top by a strip that has a row of perforations between the strip and the top of each bag, the strips in turn attached to each other by conventional fasteners such as staples. The taper may be formed by folding the bags so that a dispensed bag may be unfolded to have a bottom as wide as the top. A row of closely spaced perforations along the connecting portion between any two bags allows a single outermost bag to be separated by pulling and tearing along the row of perforations.

Abstract: Tapered bags are dispensed singly from a roll. They may be made of plastic, paper, aluminum foil, or aluminum foil laminated with plastic. The bags are connected on the roll alternately top-to-top and bottom-to-bottom. Each bag is tapered towards its bottom such that its top-to-top connection with the next bag is wider than the bottom-to-bottom connection. The taper may be formed by folding the bags so that a dispensed bag may be unfolded to have a bottom as wide as the top. Each bottom-to-bottom connection separates the bags along a row of perforations adjacent to a sealed seam of each bag that defines the bag and insures its integrity. A row of closely spaced perforations along the connecting portion between any two bags allows a single end bag to be separated by pulling and tearing along the row of perforations.

Abstract: Portland cement particles having the characteristics of slow hardening is oduced by a process of heat treating portland cement particles in the temperature range from 1500.degree. to 3000.degree. C. for from 0.5 to 10 seconds and cooling to obtain particles containing an amorphous, glassy shell as an outside layer.

Abstract: A display device comprising an insulating carrier (1) and shutters (V) which are capable of rotating under the effect of an electrical field (E) which is perpendicular to the plane of the carrier. The shutters (V) are grouped in pairs and are controlled by applying a voltage between a shutter and a counter-electrode (c). The control may be multiplexed if the shutters of the same pair have different potentials applied thereto.

Abstract: A dental implant which is imbedded within a body of acrylic material in a channel formed in the jawbone such that no portion of the implant comes in contact with the bone. The implant includes one or more projecting pins for supporting an artificial tooth and a series of lateral projections which extend into the acrylic material to hold the implant in place.