Abstract: Copolymers of acrylic or methacrylic materials of known type and reacted with novel, silicone-substituted acrylic and methacrylic compounds so as to produce an oxygen-permeable plastic material which is uniquely suitable for manufacturing novel corneal contact lenses. The silicone materials include high molecular weight polysiloxanylalkylesters of acrylic and methacrylic acids, made from acrylic or methacrylic ester silanes containing one or more highly substituted siloxanyl groups.One such siloxane substituent, pentamethyldisiloxane, is prepared by a novel method. Certain of the substituted silanes are prepared using a novel compound, tris(trimethylsiloxy) acetoxysilane.

Abstract: An immersion cleaner for parts and other articles. The cleaner includes a receptacle for articles, a cover unit for a container of cleaning liquid, a cam plate unit disposed on the cover and including a circumferentially extending cam track surface having axially undulating portions, and a combination receptacle support and cam follower unit. The follower rotates about a vertical axis and is disposed in the use above the cam plate. The receptacle support unit includes means adapted to engage the cam track and to ride thereover upon oscillation of said support unit about its axis. A rod is attached to a portion of the support unit and forms an operative connection between the receptacle and the support unit. The support unit is driven in an oscillating mode. This causes the receptacle to swing through an arc and to rise and fall simultaneously.

Abstract: An apparatus for wiping the tip of a sample dispensing tube. The apparatus includes means such as a pair of arms for locating the tip portion of a dip tube and for guiding the tube for movement between a first operative position in which the tube aspirates a charge of liquid from a sample container and a second position in which said tube will discharge said liquid into a reaction vessel such as a transfer disc. The wiper includes means for receiving a supply of absorbent wiping material in ribbon form, and a spool for taking up the ribbon, as well as means defining a path along which said ribbon will move between the supply means and the takeup spool. A pair of pins or the like are spaced closely apart from said tip and adapted to urge said ribbon into wiping contact with said tip. The takeup spool is driven in response to movement of the locating and guiding arms.

Abstract: Various forms of apparatus are described for manufacturing half seal units by injection molding in specially constructed molds. The apparatus was developed in response to a need for producing precision parts, particularly so-called insert molded parts containing integral stiffening members surrounded by an elastomeric seal body. Seals of this type are mated upon installation in position of use to form a unitary seal which provides primary and secondary seals as well as a seal at the split line where the two half seals are joined. One described molding apparatus includes means adapted for formation of a mold cavity from horizontally movable, cam actuated mold parts wherein finished so-called piece parts are removed after molding by an axial movement with a specially constructed stripper assembly.

Abstract: A variable volume, positive displacement pump apparatus for withdrawing samples of liquid from a reservoir and discharging them into a sample analyzer. In the preferred form of pump, two syringe assemblies are provided, each one having a movable plunger assembly and a valve unit associated therewith. The plunger assemblies are reciprocated by engagement thereof by a motor driven, reciprocable carriage assembly which includes a cross member for pushing selected metering rods upwardly against the plungers. The carriage also includes a pair of yokes to engage the plungers and pull them downwardly to aspirate the specimens. Valve movement is achieved by a gear drive which moves the valve between one position which enables the syringe to be filled and another position enabling the syringe contents to be discharged. The volume displaced with each stroke is determined by the length of the metering rod inserted between the carriage and the syringe plunger.

Abstract: A plant feeding apparatus for providing a continuous supply of liquid to the soil surrounding potted plants. The apparatus includes a fluid reservoir portion with a reservoir body and a cover assembly, and a soil probe portion with an axially extending, wick-receiving opening disposed therein. A soil moisturizing wick is provided which extends from the reservoir and into the opening in the probe. The soil probe is relatively rigid and includes a variable-area aperture in a part thereof for permitting at least a portion of the wick to be exposed through the aperture for moisturizing the soil received in a container. A neck or shoulder is found where the probe meets the reservoir body, and this shoulder facilitates mounting the apparatus on a rim of the pot or other receptacle. An adjustable slide serves to expose more or less wick through the aperture in the probe.

Abstract: Two forms of device are described for preventing unintentional removal of the contents of mobile tanks before unlocking the vent caps thereof. In one form, a guard unit is provided which is movable between positions permitting or interfering with attachment of a drain conduit to the drain opening. A guard unlocking linkage is provided which includes portions movable between first and second positions respectively, with the vent opening cover being required to be opened before the unlocking linkage can be moved to the second position. When the cover is open and the unlocking linkage can be moved, the guard unit is moved to the position permitting attachment of the drain conduit.In another form, a locking plate is provided on the vent cover and a notch on the plate registers with a locking device connected to a first hydraulic piston and cylinder assembly.

Abstract: An immersion cleaner for parts and other articles. The cleaner includes a receptacle for articles, a cover unit for a container of cleaning liquid, a cam plate unit disposed on the cover and including a circumferentially extending cam track surface having axially undulating portions, and a combination receptacle support and cam follower unit. The follower rotates about a vertical axis and is disposed in the use above the cam plate. The receptacle support unit includes means adapted to engage the cam track and to ride thereover upon oscillation of said support unit about its axis. A rod is attached to a portion of the support unit and forms an operative connection between the receptacle and the support unit. The support unit is driven in an oscillating mode. This causes the receptacle to swing through an arc and to rise and fall simultaneously.

Abstract: An end face seal especially adapted for use in severe service environments such as for sealing track pins of crawler type tractors. The seal includes a primary annular seal, having a radially extending flange portion for contacting a mating surface in face sealing engagement and an axially extending flange portion, and a secondary annular sealing member positioned in use about the axial flange portion. The cross section of the secondary annular sealing member is generally parallelogram-shaped in an unstressed condition.

Abstract: A ferrous metal alloy and a heavy-duty grit seal having an annular ring made from the alloy. In the preferred form, the alloy includes from about 3.10% to about 3.35% carbon, not more than 1.00% manganese, from about 0.75% to about 1.40% silicon, from about 16.5% to about 19.0% chromium, from about 0.75% to about 2.00% vanadium, from about 2.5% to about 4.0% molybdenum, from about 0.25% to about 1.25% cobalt, from about 1.75% to about 3.00% tungsten, not more than 0.040% phosphorous, not more than 0.040% sulfur, and the remainder being iron. The alloy, when used as a seal ring, provides performance which is nearly as good as extremely costly, specially cast, high performance, wear resistant alloys and does so at greatly reduced cost. The alloy is highly abrasion resistant and withstands severe conditions of mechanical shock and extreme temperature ranges without embrittlement.

Abstract: A seal for sealing between a shaft and a shell where the shell is sealingly located between two webs which extend radially outwardly from a body portion, and inwardly towards each other.

Abstract: An oil or grease seal unit of the radially acting type which includes a relatively stiff mounting portion and a relatively flexible elastomeric sealing lip portion adapted to surround or be surrounded by a relatively movable machine member or element to prevent passage of fluid, such as oil or the like, axially along the shaft to the exterior of the region to be sealed. A novel form of pumping element is provided whereby a strong pumping or oil return action from the exterior of the sealed region to the interior thereof may be accomplished by the provision of generally helically disposed, rib-like pumping elements lying on one frusto-conical surface of the sealing lip. The pumping elements are disposed at an angle both to the direction of shaft rotation and to a shaft axis, and are arranged to blend into the intended area of contact between the seal lip and the shaft, that is, the static lip formed by the convergence of inner and outer frusto-conical surfaces.

Abstract: An improved window sash balance and components thereof. The balance includes a spring fixed with respect to the frame and a pair of pulley blocks, each containing one or more pulleys. One block is fixed with respect to the frame and the other is disposed on the end of the spring. A cord is secured to one pulley block and trained over the pulleys. The other end of the cord terminates in a hook adapted to be received in an opening in the window jamb channel. The pulley block unit includes a pulley-receiving frame, one, two or three pulleys received therein, and at least one axle for rotatably supporting the pulleys within the frame. The block has one or two pulley-receiving openings therein, and suitable openings for reception and positioning of the axle. The block includes first and second pairs of assembly reference surfaces forming a part of the block and spaced radially from the axle opening.

Abstract: A safety-type improved motorcyle windshield assembly is described. The windshield panel has lower, central, and upper portions, with at least the upper portion thereof being transparent. The lower portion of the windshield panel is attached to a first part of a motorcycle with which the shield is to be associated in use, and mounting rods attach a part of the windshield panel disposed above the lower portion of said panel to the same or to another part of the motorcycle which is fixed with respect to the first motorcycle part. The mounting rods each include an end portion disposed remotely of the windshield panel, an end portion disposed proximate to the windshield panel, and an intermediate portion extending between the end portions thereof. The proximate end portions include means attaching the windshield panel to the proximate end portions.

Abstract: An apparatus and method for teaching reading which is based on training the eye of a reader to fix or focus initially on a word or letter group lying within an area defined by an intentionally reduced or narrow angular lateral span, and subsequently to be exposed to groups of letters, words, and groups of words of gradually increasing lateral span. The student also systematizes the direction of a succession of eye movements and uses exterior rhythmic stimuli to reinforce the rhythm of eye movement.Preferably, the student is furnished with reading material which consists of a series of word groups of normal print size, arranged in logical sequence and of simple content. The words are observed by the student through an optical lens which greatly reduces the image size of the printed matter, causing each word to lie within a very small angular lateral span. The student then rhythmically moves his line of sight from the first or left-hand word in such group to the next horizontal word, etc.

Abstract: A hub cap assembly for vehicle axles which includes a rigid hub cap body with a sidewall portion and a radially inwardly directed flange having a window therein so that the lubricant level in the axle housing can be seen without removing the hub cap. The window is received by a flange having inner and outer axially directed surfaces and an inner edge defining an opening in the cap body. The window unit includes a transparent central panel and a mounting portion comprising first and second annular, generally axially extending window-mounting flanges which are spaced radially apart from each other so as to define an annular seal-receiving groove. One window-mounting flange has an axially facing end portion snugly received against the outer axially directed surface, and another window-mounting flange extends partly through the cap body opening. The other or second window-mounting flange includes a locking device with a part which snugly engages the inner axially directed surface of the flange.

Abstract: An apparatus for incubating and analyzing blood samples while the samples are measured for oxygen association. The apparatus includes a controlled atmosphere chamber in which humidity, temperature and carbon dioxide may be maintained at a predetermined level while the level of oxygen concentration is varied. The samples are received in an apparatus which includes at least two slides having pockets therein for receiving the samples. The slides are arranged so that the specimens may be inserted in the holders, indexed to desired positions within the chamber for incubation and analysis, respectively, and removed from the chamber without affecting the controlled atmosphere within the chamber.

Abstract: A safety device for open receptacles adapted for use with flammable solvents and the like. The safety device comprises a unitary piece adapted to be received within the drain opening of a sink or other receptacle in which parts and mechanical components are temporarily received for cleaning by passage of solvent thereover. The device includes a locating flange, and a wall which subdivides the receptacle drain opening into an ordinary flow path and a second opening. The wall also defines an alternate drain flow path between other portions of the receptacle interior and the drain opening. The alternate flow path to the secondary drain is preferably defined by a contoured wall which cooperates with the interior surfaces of the receptacle to define a drain path for solvent which can flow through the principal drain path. This wall contains a large number of openings so that accidental or even intentional blockage of the drain path cannot be readily accomplished.

Abstract: A vehicle trailer of the fifth wheel type particularly adapted for attachment to a light towing vehicle such as a pickup truck. The trailer body includes front, rear, and sidewalls and a floor which slopes downwardly to the rear of said trailer body at a substantial angle. The trailer includes a chassis supporting the trailer body, and the chassis includes chassis rails disposed beneath and parallel to the trailer floor. These chassis rails include an upper, forward portion and a lower, rearward portion and a wheel mounting sub-frame disposed beneath the lower, rearward portion of said chassis rails. The attachment arrangement includes a tongue having a rear portion thereof attached to and extending forwardly from the upper, forward portion of said chassis rails, and a tube or the like extending downwardly from a forward portion of the tongue for engaging a fifth wheel or ball on the bed of the towing vehicle.

Abstract: Method of measuring the oxygen association state of blood samples, which includes the steps of disposing a blood sample within a blood-receiving receptacle, providing a controlled atmosphere chamber, incubating the sample by placing it in the chamber and controlling said atmosphere therein so as to maintain the humidity, temperature, and carbon dioxide content of the atmosphere at substantially constant levels, and thereafter analyzing the sample by changing the concentration of oxygen in said chamber from time to time while observing the changes of oxygen association of the sample with respect to the concentration of oxygen within the chamber.An apparatus which includes two sample holders receiving slides adapted to position the samples in the chamber in incubating and analyzing position, respectively.