Abstract: A silencer device is installed into the discharge pipe of a centrifugal compressor by first installing a channel shaped frame in the discharge pipe and then sliding the silencer device into the frame to be contained for operational use. The orientation and placement of the frame and its contained silencer device is parallel with the direction of flow to thereby reduce the resulting pressure drop, and it is placed near a turn in the discharge pipe such that the sound will tend to be reflected from the discharge pipe to cause multiple passes through the silencer device and thereby enhance its absorptive performance. The absorptive material within the silencer device is protected from erosion by a surrounding cloth bag composed of a fine weave Nomex material.

Abstract: A noise attenuating assembly for use in conjuction with an air conditioning unit having a sloped discharge opening is disclosed. The assembly includes a front wall and a pair of side walls forming a flow path for the conditioned air which is discharged to the space containing the unit. The assembly has a layer of sound attenuating material attached to the inside surface of the walls so that the assembly deflects and absorbs line-of-sight sound produced by the unit fan, thus reducing the noise level of the unit.

Abstract: A post bushing for use in a chair assembly, seat post assembly, or other application where a tube is supported around a base. The post bushing includes a flexible umbrella member which secures the outer tube to the post, but which flexes and compresses such that a rigid collar on the bushing can receive the radial load.

Abstract: A seat swivel apparatus includes a first mounting plate rotatively mounted to a second mounting plate. Each of the first and second mounting plates has a circular recess formed therein to define a pair of bearing races which hold bearing means such as a plurality ball bearings. The first and second mounting plates are held together utilizing fastening means that include a Belleville spring to provide a continuous and substantially constant biasing force on the plates to maintain them in proper rolling contact with the ball bearings. Each of the races include two arcuate sidewall portions and a connecting portion between the sidewall portions, the connecting portions being substantially flat to help prevent the bearings from tightening within the races.

Abstract: A glass cover for an enclosure is mounted over an opening in the enclosure by a pair of recessed hinges, each of which includes a hinged body. There are two slots in each hinged body. Each hinged body is positioned within a recess in the enclosure wall. The hinge also includes a frictional member positioned in one of the slots in the hinged body, and a cover holder. Two pins couple the cover holder to the hinge body. One of the pins is coupled to the friction member; this pin passes through one of the slots into a socket in the friction member. The other pin is positioned within the other slot. The frictional member engages a portion of the hinged body defining the perimeter of the slot in which it is disposed. As the cover is raised and lowered, the frictional member rides along this slot. The frictional forces between the side walls of the slot and the friction member are such that the cover remains stationary when the person lifting the cover releases his or her grip.