Abstract: A filled structure includes a fiber reinforced resinous hollow structure having a tensile strength of at least 30,000 psi, and an inside surface forming a boundary which defines a space. A hard core is provided within the space. The hard core has a density of at least 35 pounds per cubic foot and a compressive strength of at least 1500 psi. The hard core is formed from a mixture of particulate cementitious material and liquid. At least one tendon under stress is provided in the hard core. The tendon is constructed and arranged to exert permanent stress on the hard core.

Abstract: A filled structure characterized by the combination of high compressive and tensile strength to allow a high bending load includes a fiber reinforced resinous hollow structure having a tensile strength of at least 30,000 psi. The hollow structure has first and second ends, an inside surface forming a boundary which encloses a space, and an outside surface. At least a portion of the outside surface of one of the ends has a roughened portion sufficient to provide frictional resistance with the ground when the one end is driven into the ground. A hard core is disposed within the space enclosed by the hollow structure. The hard core has a density of at least 35 pounds per cubic foot and a compressive strength of at least 1500 psi. The hard core is formed from a mixture of particulate cementitious material and liquid.

Abstract: A filled structure includes a fiber reinforced resinous hollow structure having a tensile strength of at least 30,000 psi, an inside surface forming a boundary which encloses a space, and a hard core within the space. The hard core has a density of at least 35 pounds per cubic foot and a compressive strength of at least 1500 psi. The hard core is formed from a mixture of particulate cementitious material and liquid such that when the mixture hardens, the hard core is mechanically locked to the inside surface of the hollow structure.

Abstract: A filled structure includes a fiber reinforced resinous hollow structure having a tensile strength of at least 30,000 psi and an inside surface forming a boundary which encloses a space. A hard core is provided within the space enclosed by the hollow structure. The hard core has a density of at least 35 pounds per cubic foot and a compressive strength of at least 1500 psi. The hard core is formed from a mixture of particulate cementitious material and liquid. The filled structure is constructed and arranged such that the hard core is locked to the inside surface of the hollow structure by mechanical bond or chemical lock or stressed expansion.

Abstract: A filled hollow structure, such as a fence post, which is constructed with a hollow member filled with a core to increase its strength. One aspect of the structure is that the core material normal expands upon setting, so that, when hardening within the hollow member, the expansion is restrained by the hollow member and the core is formed into an integral structure with the hollow member. Further strength is added by constructing the hollow member of reinforced fiberglass with the fiberglass ravings oriented at an angle to the axis of the pipe and by using a hard coating on the outside of the pipe.

Abstract: A filled hollow structure, such as a fence post, which is constructed with a hollow member filled with a core to increase its strength. One aspect of the structure is that the core material normal expands upon setting, so that, when hardening within the hollow member, the expansion is restrained by the hollow member and the core is formed into an integral structure with the hollow member. Further strength is added by constructing the hollow member of reinforced fiberglass with the fiberglass rovings oriented at an angle to the axis of the pipe and by using a hard coating on the outside of the pipe.

Abstract: An electrostatic spray gun including a housing for receiving a replaceable fluid container, a nozzle from which fluid is to be sprayed, apparatus for expelling the fluid from the container and a high voltage generator for applying electrostatic potential to the fluid to form an electrically charged atomized spray at the nozzle. The replaceable fluid container is externally insulating and the electrical path from the generator passes through the fluid entering it at a point remote from the nozzle. A piston is employed to expel the fluid from the nozzle during spraying. The electrostatic spray gun has the advantage that it does not employ propellants and the paint need not be stored in a flexible plastic container thereby preventing loss of solvent during storage.

Abstract: The invention provides an electrostatic spray gun including a replaceable fluid container a nozzle outlet, apparatus for applying high voltage to the liquid and a spring loaded trigger piston for pressurizing the liquid through the outlet. The piston has axially inner and outer parts for forming a lubricant chamber therebetween. The lubricant seals the paint forward of the piston during pressurization and prevents the piston from being locked up during reciprocation.

Abstract: An electrostatic spray gun includes a housing for receiving a replaceable fluid container, a nozzle from which fluid is to be sprayed, a device for expelling fluid from the container, and a high voltage generator for applying electrostatic potential to the fluid to form an electrically charged atomized spray at the nozzle. An electrical path from the generator to the nozzle passes through the fluid, entering the fluid prior to its emergence from the nozzle. The container is rigid and fluid is expelled from the container by a piston under pressure exerted thereon through a forward part of the generator.

Abstract: An electrostatic spray gun comprising a housing (32) for receiving a replaceable collapsible container, a nozzle (39) from which fluid is to be sprayed, squeeze grip mechanism (36, 35, 34) for compressing the container to feed fluid to the nozzle and high voltage contacts (38a, 38b) for applying electrostatic potential to the fluid such that the fluid issues from the nozzle in the form of an electrically charged atomized spray, wherein the nozzle (39) forms or is fed by a resealable delivery valve having inner (11) and outer valve members (12) with fluid fed to a gap between them by the compression of the container, from which gap the fluid emerges to form the spray and the gap being closable, desirably with a wipping, fluid-cleaning action, by relative movement of the members.

Abstract: A portable security wall for isolating an area on the ground includes an enclosure wall comprised of a plurality of sections, a plurality of post members for mounting the wall on the ground, and a plurality of weighted post support members for supporting the post members. The wall can be made of separate rigid sections or, alternatively, a continuous flexible band with a plurality of longitudinally-spaced pockets for receiving the post members. The pockets define the sections of the wall. The wall can also be made of separate flexible sections which may be wound on or unwound from elongated shaft members by applying a rotary force, e.g., through use of a motor. The wall may be made tall to block the public's view of the area and two tall walls may be connected together to form a canopy.