Abstract: A speaker system includes a cabinet, a front baffle, a speaker unit, a rear baffle, and a fitting member fitted in the rear baffle. The front baffle includes a front duct segment extending backward from the rear thereof. The rear baffle includes an opening portion, a duct connecting portion, and a receiving portion having a semicircular cross section. The receiving portion extends from the opening portion to the duct connecting portion while protruding backward. The opening portion, the receiving portion, and the duct connecting portion have a groove. The receiving portion has an engagement hole. The fitting member having a semicircular cross section is formed by double molding. The frame of the member is made of relatively rigid resin and the rim thereof is made of relatively flexible resin. The frame has an engagement projection. The receiving portion and the fitting member constitute a sealed rear duct segment.

Abstract: A pipe plug includes two or more pivotally connected plugging heads that work in combination to double block and bleed a pipe. At least one of the plugging heads has an expandable sealing element that is in communication with an inflation source. The sealing element may be an inflatable sealing element or a compression packer sealing element. A passageway-sections of which may pass through the pivotal connection and into the plugging head-carries the inflation medium from the source to the sealing element. A bleed port passageway is also provided that passes through the plugging head. The leading plugging head may include a cleaning element for sweeping away debris ahead of the plug. The plugging heads may also include a skid plate that slideably engages the interior surface of the pipe to properly orient the plugging heads within the pipe.

Abstract: A pipe plug comprised of two, pivotally connected plugging heads, each plugging head having a sealing element, which work in combination to double block and bleed a pipe. The first sealing element prevents flow of product in the pipe and the second sealing element captures any leakage past the first sealing element and forces that leakage out through a fitting. A stabilization pad, connected to a flange on a nosepiece of each plugging head, prevents deformation of the sealing elements. A spring-loaded pivot arm connected to the second plugging head allows the yoke that connects the two plugging heads to rotate freely. An outward-facing raised taper projection on the pivot arm, along with a guide wheel connected to the first plugging head, prevent the yokes and plugging heads from becoming entrapped during their installation in or removal from the pipe.

Abstract: This invention contemplates a resettable plug assembly suitable for insertion into a pipeline from a transverse tee connection in order that flow may be stopped and pressure retained by the plug. The stopper plug is inserted in the upstream direction and utilizes a bypass valve to aid installation when there is flow. The seal of the plug is expanded radially to contact the wall of the pipeline for sealing. Once in place the bypass valve is closed to stop the flow in the pipeline.

Abstract: An end cap is provided for adjacent pipes in the cooling coils of an electric air furnace. Each end cap includes parallel opposite side walls and a curved end portion connecting the side walls. The side walls and end portion define a perimeter edge, the outer portion of which is beveled. The end cap includes a pair of tabs extending from each side wall. The tabs partially fill the crevice between adjacent end pipes so as to provide a stronger weld between the end cap and the pipes. The curvature of the end cap minimizes turbulence of the liquid coolant flowing through the pipes.

Abstract: A utility connection bar (30) dimensioned to extend between a gas supply line (42) and a customer gas line (44) of a conventional gas connection (41) is formed of molded plastic and has a bar (36) extending between threaded ends (32) and (34). The plastic bar (36) and the ends (32) and (34) have a plurality of channels (38) which extend the length of the connection bar. A pair of 1/4 inch diameter holes (40) extend through the plastic bar (36) near the threaded ends (32) and (34). The combination of the channels (38) and the holes (40) makes it very difficult to form a gas flow path between the threaded ends (32) and (34) without altering the external appearance of the connection bar (30). In a utility connection bar (70), channels (86, 92) extend vertically between bottom (88) and top (90) of plastic bar (72).

Abstract: A fuel rail containing injectors for delivering fuel to an engine has a large passage supplying fuel to the injectors and a small fuel return passage. The injectors are received in sockets each of which has a restricted vent extending to the return passage. The fuel rail is formed by molding or extruding a body with the supply and return passages, and a single circular plug at one end provides a closure for the associated ends of both the supply and return passages.

Abstract: Heat-recoverable articles, especially heat-shrinkable tubular articles, having an open end are formed so that the section adjacent said open end has a lower recovery ratio than a section adjacent thereto, thereby substantially reducing the risk of splitting when the degree of recovery is high or in applications where a high degree of unrecovered strain remains after recovery about a substrate such as a supply line. A preferred article is a tubular cap which has an open end section having a first expansion ratio, an intermediate section having a second expansion ratio and a closed end section having a third expansion ratio, the second expansion ratio being greater than the first and third expansion ratios. Such a cap may be employed to seal a conduit against ingress of moisture and other contaminants. When a supply line is subsequently to be passed through the conduit the closed end may be removed and the article shrunk to grip the supply line.