Abstract: A centralizer for centralizing a pipe is provided which collaborates the spring force of its bow springs. The centralizer includes a pair of end collars, and at least one center collar. Each of the collars has a center hole for coaxially receiving a pipe. In addition, the centralizer includes a plurality of longitudinally extending and arcuate bow springs having ends which affix to the end collars. The centralizer includes linkage arms which connect the center collar to the bow springs. The linkage arms may provide additional outward spring force against the bow springs. Preferably, the centralizer includes a mechanism for forcing the bow springs radially inward from their at rest position.

Abstract: New apparatus and methods are provided for positioning and attaching centralizers to the inside sidewalls of a wellbore. One or more centralizers are maintained in the interior of a pipe that is transported downhole into a well for deployment. Preferably, the pipe is also the wellbore's casing and the centralizers are deposited in a top-down manner as the casing travels downhole. The centralizers of the present invention are constructed to have an at least partially circular structure with a central hole. The preferred centralizer has an expanding circular structure wherein the diameter of the centralizer is substantially uniform so as to form an annular construction. Once deployed, the annular centralizer expands to engage the wellbore sidewall with the central hole expanded for passage of the well casing.

Abstract: A centralizer for centralizing a pipe is provided which collaborates the spring force of its bow springs. The centralizer includes a pair of end collars, and at least one center collar. Each of the collars has a center hole for coaxially receiving a pipe. In addition, the centralizer includes a plurality of longitudinally extending and arcuate bow springs having ends which affix to the end collars. The centralizer includes linkage arms which connect the center collar to the bow springs. The linkage arms may provide additional outward spring force against the bow springs. Preferably, the centralizer includes a mechanism for forcing the bow springs radially inward from their at rest position.

Abstract: New apparatus and methods are provided for positioning and attaching centralizers to the inside sidewalls of a wellbore. One or more centralizers are maintained in the interior of a pipe that is transported downhole into a well for deployment. Preferrably, the pipe is also the wellbore's casing and the centralizers are deposited in a top-down manner as the casing travels downhole. The centralizers of the present invention are constructed to have an at least partially circular structure with a central hole. The preferred centralizer has an expanding circular structure wherein the diameter of the centralizer is substantially uniform so as to form an annular construction. Once deployed, the annular centralizer expands to engage the wellbore sidewall with the central hole expanded for passage of the well casing.

Abstract: An aerofoil, particularly a helicopter main rotor blade has a leading edge protector comprising a strip of resilient polymer, preferably polyurethane, adhered to the leading edge of the flex section of the blade.

Abstract: A bulk cargo container is disclosed for storing, transporting or processing solid or liquid bulk materials. The bulk cargo container includes a vessel suitable for containing the bulk material and a supporting frame assembly having a generally horizontally disposed support member attachment. In an exemplary embodiment, the vessel is formed of fiber reinforced plastic material and includes a container portion and a support member. The container portion is formed into at least one hopper having a discharge opening therein suitable for discharging bulk material contained within the vessel. The vessel is supported from the support member attachment via the support member so that the weight of the bulk material is carried in tension by the fiber reinforced plastic material of the vessels shell.

Abstract: An open top vessel containing bulk or liquid material comprising an inclined front wall, an inclined rear wall, and inclined opposite side walls. The walls of the vessel extend downwardly and inwardly from the upper ends thereof towards the lower ends thereof towards a discharge opening formed at the lower end of the vessel. A support frame is provided for supporting the vessel and includes at least a pair of horizontally spaced-apart, horizontally disposed support frame members which receive inverted U-shaped supports on the upper end of the vessel. The vessel is ideally suited for use as a hopper bottom in a hopper bottom trailer. The vessel is comprised of a fiber reinforced plastic material.

Abstract: A door of fiberglass construction is described and which comprises an outer fiberglass skin having an interior compartment filled with a foam material with the skin enclosing the foam material and being of seamless construction. The foam material includes a high density foam material along at least portions of the periphery of the interior compartment and an inner member comprised of a low density foam material.

Abstract: A door frame including of first and second door frame members is provided wherein each of the first and second door frame members is of unitary molded fiberglass construction. Each of the first and second door frame members including side jambs having a head jamb extending therebetween. Each of the first and second door frame members includes a trim section which overlies a wall surface of the wall extending around the door opening and includes an inside section extending substantially perpendicularly from the trim section. The inside surface of one of the door frame members may be trimmed for reception in a recess formed in the other frame member so that the frame members will accommodate walls of various thicknesses. A door of fiberglass construction is hingedly secured to one of the door frame members.

Abstract: A building constructed of a molded fiberglass inner shell having a molded fiberglass outer shell positioned thereover to create a space therebetween which is filled with a foam core material. Each of the inner and outer shells include upstanding walls and a roof extending thereover. The inner and outer shells are provided with registering door openings formed therein into which a door is mounted. A pair of differently designed floors may be utilized in the building. Further, the floor may be omitted if desired. The outer surface of the outer shell has a smooth finish as does the inner surface of the inner shell.

Abstract: An elevated walkway platform comprising at least one elongated platform module positioned in a generally horizontal attitude and being supported above a work area. The platform module comprises a substantially flat deck having side walls or toe boards extending upwardly from the opposite sides thereof. A flange extends horizontally outwardly from the upper end of each of the toe boards. A plurality of transversely extending strengthening ribs are molded integrally with the module and are positioned beneath the deck for strengthening purposes. A pair of longitudinally extending strengthening ribs may also be provided at the underside of the deck at the opposite sides thereof. The strengthening ribs are filled with a rigid foam material. The module is also provided with handrail post supports positioned at the exterior surface of the toe boards and which are adapted to receive a handrail post therein. The entire module is constructed of a one-piece, molded plastic material reinforced with fiberglass.