Abstract: A filament-wound composite coupling for use in assembling a restrained joint between large diameter pipes with complementary retaining grooves, such as 16 inch or larger outer diameter polyvinyl chloride pipes. The coupling has first and second ends and ported retaining grooves associated with each end. Preferably, the coupling also includes O-ring seals and a pipe stop to index the pipes to be coupled. The composite coupling has a cylindrical composite body with a plurality of concentrically arranged layers of wound filaments in a thermoset plastic matrix. Each of the layers is characterized by a winding angle opposing the winding angle of the adjoining layers.

Abstract: A method is set forth for making a diamond film coated wear part, including the following steps: providing a part; depositing a first layer of polycrystalline diamond film on the part with non-{100} crystallographic faceting; and depositing on the first layer a second layer of polycrystalline diamond film having {100} crystallographic faceting, the second layer having a thickness sufficient to overgrow the roughness of said surface of said first layer with a continuous film.

Abstract: A permanent stud wall structure having improved sound transmission loss comprising two substantially parallel rows of spaced apart vertically extending support members secured at their ends to a base and header respectively by appropriate means and defining a stud cavity; said vertically extending support members being located in each of said rows such that there is a corresponding support member in the other row that is in substantially the same plane running perpendicular to said rows; one or more horizontally extending relatively rigid support members extending between one or more corresponding vertically extending support members and being secured to said vertically extending support members by appropriate securing means; said horizontally extending members including a vibration isolator means to reduce the transmission of sound between opposite ends thereof; and one or more layers of a covering material secured to the outwardly facing surfaces of one or more of said vertically extending support members s

Abstract: In a preferred embodiment, an improved knife holder for use in wood chippers of the type having a series of substantially radially positioned knives mounted on a rapidly rotatable disc which eliminates the use of a separate counter knife by combining the knife holder and counter knife presently used into one unit the wear area of which is hard-surfaced for longevity.