Abstract: A sight glass for observation of industrial applications using a non-glass lens.

Abstract: The present invention is directed to an oil hub cap comprising a cylindrical body for mounting to a wheel axle defining an interior space for holding lubricant oil and a transparent front face. An indicating ring is located within the interior space, such that the outside edge of the indicating ring indicates the minimum amount of lubricant to be contained within the interior space and the inside edge of the indicating ring indicates the maximum amount of lubricant to be contained within the interior space, the surface of the indicating ring between the inside and outside edges being provided with a reflective surface.

Abstract: A particulate material monitoring system for efficiently monitoring the level of particulate material within a container. The particulate material monitoring system generally includes a flange defining a front opening, a viewing cover attached to the flange covering the front opening, a viewing wall connected to the flange and a rear opening extending through the viewing wall.

Abstract: Apparatuses are disclosed including an apparatus for machine fluid monitoring or sampling comprising a transparent sight glass attachable to a machine such that machine fluid is transferable to the sight glass. The sight glass may have one or more ports, an open first end, a closed second end, and a cavity for the machine fluid. A grommet may be positioned in a first port of the sight glass and may have a sealable access pathway through the grommet to the cavity within the sight glass through which a probe may be extended. A magnetic plug may be positioned in the second port of the sight glass extending into the cavity within the sight glass such that the magnetic plug is positionable for contact with the machine fluid. A sample port assembly may be connected to the sight glass whereby samples of the machine fluid are accessible.

Abstract: A particulate material monitoring system for efficiently monitoring the level of particulate material within a container. The particulate material monitoring system generally includes a flange defining a front opening, a viewing cover attached to the flange covering the front opening, a viewing wall connected to the flange and a rear opening extending through the viewing wall.

Abstract: A particulate material monitoring system for efficiently monitoring the level of particulate material within a container. The particulate material monitoring system generally includes a flange defining a front opening, a viewing cover attached to the flange covering the front opening, a viewing wall connected to the flange and a rear opening extending through the viewing wall.

Abstract: A sight glass apparatus providing visual information concerning the presence of absence of liquid in a refrigeration system has a sight glass with a pair of clear glass bodies secure to a housing having a chamber for the liquid. The bodies have angled prismatic surfaces. One body includes a convex lenses that directs light to a colored member that reflects a colored toroid image when the chamber is full of liquid. A moisture sensing element is mounted on the sight glass to identify the presence of water in refrigeration and air conditioning systems.

Abstract: An infrared sight glass for aftermarket fitment around an opening of an enclosure which enables thermal inspection of electrical equipment within the enclosure. The mounting of the sight glass is performed externally which avoids having to access the interior of the enclosure. The infrared sight glass comprises an infrared transmitting medium to facilitate use of an external infrared thermal imaging camera for monitoring the electrical equipment. A removable protective cover is locked into a closed position by security key screws and is easily removed by a slight twist when the key screws are loosened.

Abstract: A washing agent dispenser is described, for a household washing machine, namely a dishwasher, said dispenser including a tank for containing a liquid washing agent, to which a device is associated for the visual control of the level of said liquid washing agent. According to the invention, said control device has a plurality of elements of a substantially transparent material, which are inserted in respective passages extending between said tank and the outside of the body of the dispenser. The parts of each one of said transparent elements which are visible outside said body form the steps of a scale indicating the level of said liquid washing agent contained in the tank.

Abstract: A process window unit for the spectroscopic study of process mixtures The process window is comprised of a window frame for holding a window, a screw cylinder, with a radiation passage in its core and an external thread for screwing the screw cylinder into the window frame as well as an elastic seal between the window and the screw cylinder, the window being designed with a conically tapering profile on the process side opposite the screw cylinder.

Abstract: An observation window of a hyperbaric oxygen chamber includes a frame, and a transparent member. The frame is fixedly joined to a wall of the chamber. The frame includes an outer annular connecting portion, and an inner annular holding portion, which is encircled by the outer portion, and which defines a central observation hole; an annular space is formed between the connecting portion and the holding portion to help reduce effects of deformation of the connecting portion on the holding portion so that the transparent member can still be fitted into the holding portion with precision after solder welding is used to secure the frame in position. An O-shaped ring is fitted between the transparent member and the holding portion to prevent compressed gas inside the chamber from leaking and to prevent the transparent member from falling off the frame.

Abstract: A self-supporting container formed by folding a shape-retaining paper sheet in substantially W-shape and joining opposite side edges of the inner surface thereof. At least one side wall of the container is provided with a see-through window and graduations for measuring the contents are formed at or adjacent to the window. By reading these graduations, the contents are easily measured. Supplementary graduations for measuring small amounts and auxiliary members for accurate measuring are also added.

Abstract: A container for liquids having a receptacle suitable for containing a liquid, the receptacle having a wall portion and a floor portion joined to contain liquid, the wall portion having an aperture suitable for allowing a substantial portion of the liquid to be viewed therethrough; and a window means for allowing a user to view the liquid contained in the receptacle, the window means being located contiguous with the aperture so as to prevent liquid from escaping from the receptacle through the aperture.

Abstract: The invention provides a sightglass assembly for viewing the interior of a vessel, such as a reaction vessel for chemical or biochemical reactions, and is adapted to be welded to a vessel wall. The sightglass assembly comprises a window disc fused to a metal frame having a flange extending radially therefrom. The assembly is set into an appropriately sized opening in the vessel wall and the outer perimeter of the flange is welded to the vessel wall. An annular groove in the flange, surrounding the frame and window disc, absorbs stresses created by the heat of welding and thus protects the integrity of the entire unit. When installed, the sightglass assembly and inner face of the tank wall provide an easily cleanable smooth continuous surface, free of recesses and crevasses where bacteria can collect and grow or product from previous batches can accumulate and cause contamination.

Abstract: There is disclosed a method of securing a stainless steel housing (12) for a kettle (10), a polypropylene or polycarbonate water gauge (14), and a polypropylele or polycarbonate backing element (16A, 16B, 16C, 16D, 16E), including the steps of (a) welding the water gauge (14) with the backing element (16A, 16B, 16C, 16D, 16E); (b) contacting and fixedly securing the housing (12) with the water gauge (14); and (c) positioning a silicon rubber sealing ring (18A, 18B, 18C, 18D, 18E, 18F) between and in contact with the housing (12) and the backing element (16A, 16B, 16C, 16D, 16E) to thereby form a water-tight seal therebetween.

Abstract: Observation window, especially for checking the temperature of objects using infrared thermography, including a parallel-faced transparent insert made of a single crystal suitable for radiation to pass through without being substantially modified and/or attenuated, which radiation, whose wavelength may range from the visible to the relatively far infrared emanates from an object whose temperature is to be monitored, housed in a screened cabinet provided with a door or panel against which the window is arranged, wherein the insert is fitted into a support which surrounds it at its periphery and is immobilized with respect to the support, this support being applied in a sealed manner against an aperture made in the door and then locked in position by means which are only accessible from inside the cabinet, the support comprising an external protective cover capable of pivoting about a pin connecting it to this support, so as to reveal the insert and allow observation through it of the object to be monitored by

Abstract: An ultra-high, hermetically sealed optical mounting assembly for sealing a fragile optical element includes a lid portion defining a thin, bendable flange spring member to gradually and evenly apply a relatively low sealing load at a knife edge for grasping the optical element. A base portion defining a substantially non-bendable, mating flange surface defines a mating base, knife edge. A deformable metallic gasket is interposed between both knife edges and the optical element. An engineered gap between the opposed lid and base flanges and a second, optional gap between the lid and base nearest the window are used to control the amount of spring forces and the amount of compression on the window.

Abstract: A sight glass assembly is bolted to a mounting flange welded to a barge deck around an opening therein at the top of a cargo tank in the barge. A couple of wiper assemblies are mounted to the sight glass and are operable from outside the glass by hand cranks. Each wiper assembly includes a replaceable wiper cartridge having an O-ring as the glass wiping member. The sight glass assembly can be unbolted from the mounting flange for ready access to the replaceable cartridges.

Abstract: A sight glass assembly generally consisting of a first housing section having an opening therethrough mountable on a vessel wall, a second vessel section having an opening therethrough registrable with the first housing section opening when the first housing section is disposed in assembled relation with the second housing section, a pair of lenses disposed in the housing sections across the openings thereof, provided with beveled surfaces along the mating surfaces thereof, a packing member disposed between annular side walls of the lenses and the housing sections, and means for urging the housing sections together to compress the packing material and cause it to expand laterally to place the lenses in radial compression to maintain their structural integrity upon being fractured.

Abstract: The invention is directed to a viewing glass having a transparent pane and a pair of flanges. In order to facilitate simple manufacture of the viewing glass, it is proposed that the pane be arranged in an inside step of the one of the flanges and be surrounded by an O-ring for producing a vacuum-tight connection. The edge of the pane and the step of the flange preferably have corresponding frustoconical surfaces.

Abstract: A sight glass assembly comprising a housing adapted to be mounted on a wall, the housing having a bore therethrough, the housing bore having an enlarged section providing a shoulder, a lens disposed in the enlarged bore section and seated on the shoulder, at least one deformable O-ring mounted on the lens and disposed between a periphery of the lens and a wall of the enlarged bore section of the housing, a retainer member threadedly mounted on the housing, the retainer member having a bore therethrough disposed in alignment with the housing bore when the retainer member is threadedly munted on the housing, the retainer bore having an enlarged section providing a shoulder and the lens being disposed between the housing and the retainer shoulders, the retainer member having a member receivable within the enlarged housing bore section between the housing and the lens when the retainer member is threadedly mounted on the housing for compressing the O-ring against the housing shoulder and causing the O-ring to exp

Abstract: Apparatus for providing a sight glass in the lower gearcase of a marine engine wherein the gearcase has a circular opening in its side. The circular opening has three concentric segments, the outermost segment has the largest diameter and is internally threaded. The center segment is sized to accomodate a disc-shaped transparent sight glass. The innermost segment has a diameter less than the center segment and the surface between the center and innermost segments contains an annular groove. An O-ring or resilient waterproof material fits into the annular groove and the disc-shaped sight glass is fitted into the center segment of the opening in the grearcase with its outer edge pressed against the O-ring. A ring-shaped window cover is then threadedly fitted into the outermost segment of the opening in the gearcase and firmly pressed against the sight glass and locked in place by a lock nut screwed into a threaded hole in the adjoining edges of the window cover and the gearcase.

Abstract: A chest cavity evacuation apparatus is provided with an air meter which is capable of directly measuring the volume of removed air. Small volumes of evacuated air are collected and measured, and the volume meter is resettable by tilting of the apparatus.

Abstract: A device for indicating the level of liquid contents remaining in a tank which has a viewing portion through which the side of a synthetic resin tank is exposed. The viewing portion is formed around a cap and in the vicinity of an opening of the tank which can be seen through and which is held by a tank holding member, such that the opening of the tank has a dimension which is larger than that of the cap so that the level of the fuel can be viewed through the annular viewing portion formed thereby.

Abstract: A sight glass assembly for observing the lubricant in the lower gearcase of a marine engine. The assembly is designed to be bonded into a circular hole in the lower gearcase housing and includes a window retaining ring which is bonded to the gearcase housing and a lock ring located inside the gearcase, an annular O-ring of resilient water proof material fitted into an annular groove in the retaining ring, a cylindrical disc-shaped transparent sight glass one of whose two outer edges is pressed against the O-ring, and a window cover having a central void and an annular face which is pressed against the second outer edge of the sight glass. The window cover is threadedly joined to the window retaining ring and is preferably locked into place by a lock screw threaded into a hole in the adjoining edges of the window retaining ring and the window cover.

Abstract: A window of a transparent material suitable for closing an opening in a wall of a sealed container, which window has two conical portions whose bases face each other. An elastic seal is interposed between each of the conical surfaces and the wall of the opening.

Abstract: In order to accurately detect the coolant level in the coolant jacket of a cylinder head, a separate chamber member is mounted to the cylinder head and fluidly communicated with the coolant jacket of the cylinder head in a manner to contain therein the coolant by the same level as that in the coolant jacket, and a level sensor is mounted to the chamber member to detect the level of coolant contained in the chamber member.

Abstract: This invention relates to a device for indicating the temporally variable quantity of a liquid contained in a reservoir or tank, whatever the indication of this reservoir with respect to the horizontal, wherein the device comprises an auxiliary recipient fast with the reservoir, which is arranged therewith in an at least partially enveloping arrangement and which contains an invariable quantity of an auxiliary liquid of which the level serves as reference for assessing, by comparison of level, the variable quantity of liquid contained at a given instant in the reservoir. The invention is more particularly applicable to the determination of the level of fuel in a tank connected to a vehicle, of the oil in a gearbox of a vehicle, etc.

Abstract: A two-piece portable toilet having sight gauges for the flush water reservoir and holding tank. The sight gauge takes the form of a translucent plastic insert having a highlight formed by a diametral groove which permits the liquid level to be clearly ascertained. The inserts are sealed by induction welding in openings in the wall of the reservoir and holding tank respectively.

Abstract: A sight glass assembly (10), especially adapted for use with continuous vulcanizing lines and the like wherein visual or optical access is required, constructed so as to provide self-sealing action during assembly and continuously self-cleaning action during use. A chamber (19) having an exit flow aperture (25) adjacent the viewing element (14) is subjected to a pressurized fluid or gas flow, which is discharged across the inner face of the viewing element. The pressurized fluid or gas is supplied externally through a passageway communicating (16) with the chamber.

Abstract: A cooking appliance including a vat for containing food during cooking, having a lid for engaging the vat. The lid has a transparent portion forming a double window consisting exclusively of an upper window and a lower window congruently placed on top of each other and an air space sealed therebetween, such that the lower window is exposed to cooking vapors emanating from the vat and the upper window is exposed to the outside atmosphere. Improved visibility through the windows is obtained during cooking. The upper and lower windows comprise a single unitary closed shell surrounding the air space.

Abstract: A sight glass assembly comprising a first housing section having an opening therethrough, mountable on a vessel wall having an opening therethrough so that the first housing section opening registers with the vessel wall opening, the opening of the first housing section having an enlarged section, a second housing section cooperable with the first housing section, having an opening therethrough registered with the opening in the first housing section, the opening in the second housing section having an enlarged section disposed in opposed relation to the enlarged section of the opening in the first housing section, a lens disposed across the openings having the periphery thereof disposed between the housing sections and received within the enlarged sections of the openings in the housing sections, a sealing ring assembly disposed in the enlarged sections of the housing section openings, included a rigid compression ring and a resilient packing member, the compression ring being engageable with one of the hous

Abstract: A fluid container, e.g. in an air filter or lubricator, has a metal bowl with a sight glass comprising an elongate light-transmitting member of longitudinally tapered form. The sight glass member is slidable into a complementary tapered slot or recess defined by a flange integral with the bowl and overlying a flat wall portion provided with apertures to the main volume of the bowl and the space between said wall portion and the member adjacent top and bottom regions of the member respectively.

Abstract: A sight glass assembly comprising a housing structure having a circular opening therethrough, the opening having an enlarged section, a lens disposed across the opening and having a peripheral portion received within the enlarged section of the housing structure opening, a sealed ring assembly disposed in the enlarged section of the housing structure opening, the sealing ring assembly comprising a rigid compression ring and a resilient packing member mounted on the compression ring, the packing member having an L-shaped cross-sectional configuration including a wall portion mounted on an inner side of the compression ring and engaging the periphery of the lens and a flange portion mounted on the compression ring and engaging the housing structure, and means mounted on the housing structure and engageable with the compression ring for urging the compression ring against the packing member, causing the packing member to expand radially, thereby effecting a seal between the housing structure and the periphery of

Abstract: A transparent plastic plug (60) is attached to a reservoir housing (16) to provide a visual indication of the fluid level within. The housing (16) includes a pair of tabs (46, 48) and the plug (60) includes a pair of resilient projections (76, 78) which cooperate with the tabs (46, 48) to permanently attach the plug to the housing.

Abstract: The present invention is directed to liquid-level indicating windows, especially suitable for reservoirs for master cylinder, which are characterized in that a container for housing a liquid is provided with a hole bored therein to which the liquid-level indicating window is made fit. The body of the liquid level device projects outside the container and the liquid-level indicating window has on its inside wall, at the liquid-level indicating section, a sign portion which is different from the other portions of the liquid-level indicating section in the light-path length and which is made of a material almost the same in refractive index as the liquid to be contained in the container.

Abstract: An improved brake fluid reservoir is disclosed. The reservoir is made from polymethylpentene and includes 10-20% by weight glass fibers as an opacifying agent. A translucent reservoir is obtained which has the highly desirable feature of visibility of the fluid level in the reservoir without providing a clear view of the fluid.

Abstract: A safety device for a pressure vessel having an opening therein in which is positioned an upstanding base secured around the vessel opening with a frangible diaphragm covering the opening. A protective cap covers the base with the frangible diaphragm and has a central aperture therein covered by a transparent material providing continuous visibility of the frangible diaphragm. The protective cap has an internal annular seat to retain the frangible diaphragm in place and spaced apart fasteners maintain the cap fixedly connected to the base.

Abstract: A method of making a sight glass assembly generally including forming a housing having an opening therethrough provided with an annular wall, forming a lens having an annular peripheral wall provided with a diameter greater than the diameter of the housing wall at predetermined equilibrium conditions, effecting a change in the predetermined equilibrium conditions of the lens and housing sufficient to cause a dimensional change between the diameters of the housing and lens walls sufficient to permit the insertion of the lens into the opening of the housing, inserting the lens into the housing opening while maintaining the change in conditions so that the lens wall is positioned in opposed relation to the housing wall, and maintaining the lens in the opening with the lens and housing walls disposed in opposed relation while permitting a return to the equilibrium conditions of the lens and housing whereby the housing and lens wall will engage to place the lens in radial compression and form a fluid tight seal th

Abstract: A sight glass assembly including a housing structure mountable on a vessel for containing fluid, the housing structure having an opening therethrough, the opening having an enlarged section providing a shoulder, a face plate having an opening registered with the opening in the housing structure, mounted on the housing structure so that a portion thereof is disposed in opposed relation to the shoulder, a lens disposed in the enlarged section of the opening in the housing structure and interposed between the shoulder and the portion of the face plate, a packing member disposed in the enlarged section of the opening between the housing structure and the periphery of the lens, the packing member being hollow and filled with a fluid and means for securing the face plate to the housing structure and applying a force on the packing member causing the packing member to exert a uniform compressive force about the periphery of the lens and effect the seal between the housing structure and the periphery of the lens.

Abstract: A method of making a sight glass assembly generally including forming a housing having an opening therethrough provided with an annular wall, forming a lens having an annular peripheral wall provided with a diameter greater than the diameter of the housing wall at predetermined equilibrium conditions, effecting a change in the predetermined equilibrium conditions of the lens and housing sufficient to cause a dimensional change between the diameters of the housing and lens walls sufficient to permit the insertion of the lens into the opening of the housing, inserting the lens into the housing opening while maintaining the change in conditions so that the lens wall is positioned in opposed relation to the housing wall, and maintaining the lens in the opening with the lens and housing walls disposed in opposed relation while permitting a return to the equilibrium conditions of the lens and housing whereby the housing and lens wall will engage to place the lens in radial compression and form a fluid tight seal.

Abstract: A master cylinder reservoir molded of glass fiber filled nylon. An integrally molded window in a side wall is thinner than the reservoir walls and has a lower concentration of fibers so that it is sufficiently translucent to permit visual determination of the level of hydraulic brake fluid in the reservoir by observation through the window. The method of making the reservoir by molding, in which the flow of fibers into the window section is restricted to reduce the fiber concentration in the window and make it more translucent, is also disclosed.

Abstract: This invention relates to an indicating device that permits a sight reading of the level of liquid contained in or flowing through a flexible liquid carrier, such as a flexible hose. It particularly pertains to a hose used for the flexible connections in the cooling system of automobiles between the engine block and the radiator, but it is not limited to such use. It simplifies installation of a sight gauge for these and similar uses, and permits installation with simple basic tools.

Abstract: A gauge for exhibiting the liquid level in a container of alkaline liquid, for example a boiler or radiator gauge, is disclosed. The gauge includes a glass component composed at least in part of a glass consisting essentially of 20-50% SiO.sub.2, 3-40% Y.sub.2 O.sub.3, 5-25% of a divalent metal oxide and 0-30% Al.sub.2 O.sub.3. Other features of the invention include use of an yttrium concentrate in producing the glass and a composite glass component wherein only a facing portion is composed of the yttrium glass.

Abstract: An engine oil level detection device of a construction, wherein an observation window is provided in one part of an oil receptacle or pan, and a wiper to clean the inner surface of the window soiled with the lubricant oil stuck thereonto by splashing is held on the window portion in a manner to be rotatable by finger actions or by a tool.

Abstract: A sight glass assembly adapted to be mounted across an opening in a container wall, generally including a housing structure having an opening registrable with the opening in the container wall, the opening having an enlarged section including a pair of spaced opposed wall portions disposed in converging relation, a lens disposed in the enlarged section of the opening having bearing surfaces cooperable with the spaced opposed wall portions of the enlarged section of the housing structure, and sealing means interposed between the opposed wall portions of the enlarged section and the bearing surfaces of the lens.

Abstract: Device for observing electrical equipment under voltage application, characterized in that it comprises an adjustable periscopic glass which include a lens assembly which conforms to and interfits with the observation ports within the equipment and carries within the lens assembly adjacent the periphery a light source for illumination of the equipment enclosure interior.

Abstract: A sight glass assembly adapted to be mounted across an opening in a vessel containing a fluid, generally including a housing having an opening registerable with a vessel opening, means for mounting the housing on such a vessel when the housing opening is registered with the vessel opening, the housing opening having a frusto-conically shaped wall section, an annular lens holder mounted on the housing, and a lens having a peripheral side wall, mounted in the lens holder across the opening therein, the lens holder having a collet portion including a plurality of circumferentially spaced fingers having interior surfaces engagable with the peripheral side wall of the lens and exterior surfaces engagable with the frusto-conically shaped wall of the housing, the collet portion being urged into camming relation with the frusto-conically shaped wall section of the housing opening whereby the collet fingers are cammed laterally inwardly relative to the lens, placing the periphery of the lens in radial compression.

Abstract: A sight glass assembly comprising a housing having an opening therethrough, the opening having an enlarged section providing a shoulder, a face plate having an opening registered with the opening in the housing, mounted on the housing in opposed relation to the shoulder, a lens disposed in the enlarged section of the opening in the housing and interposed between the shoulder and the face plate, a resilient packing disposed in the enlarged section of the opening in the housing, between the lens and the housing structure, said face plate having a flange portion projecting into the enlarged section of said housing opening and engaging said resilient packing, and means for securing said face plate to said housing to apply a compressive force on the packing, causing the packing to expand laterally to provide a compressive force about the periphery of the lens.

Abstract: A sight glass assembly generally including a housing structure having an opening therethrough, the opening having an enlarged section providing a shoulder, a face plate having an opening registered with the opening in the housing structure, mounted on the housing structure in opposed relation to the shoulder provided by the enlarged section of the housing opening, a lens disposed in the enlarged section of the housing opening and interposed between the shoulder provided by the enlarged section of the housing opening and the face plate, a compressible packing member disposed in the enlarged section of the housing opening between the housing and a periphery of the lens, an outer end of the packing member having an annular recess extending toward the face plate, an annular wedging member disposed on the shoulder provided by the enlarged section of the housing opening and projecting into the recess of the packing member, the wedging member having a cross-sectional area greater than the cross section area of the r