Abstract: A gear reversal mechanism for a hand held power tool is selectively operative to reverse the output of a unidirectional motor and provides a direct drive forward mode and an indirect drive reverse mode, with the selection therebetween being implemented by a manual shift collar operating a cam mechanism selectively to reorient the gear train and consequent direction of motor output. The shift collar is temporarily locked to the gear housing during tool operation by using the operative air pressure of the tool to expand a locking mechanism into locking engagement with such shift collar. With or without the locking mechanism, an exhaust shutoff shift interlock may be provided to permit exhaust air to exit the housing when the shift collar is in either its forward or reverse operating positions or alternatively to close the housing exhaust ports to block exhaust air flow to preclude motor operation when the shift collar is between its operating positions.

Abstract: Spherical ball drive mechanism for directly coupling a rotary force motor to a valve member, includes a spherical bearing assembly at one end of the valve member. The spherical bearing assembly consists of an outer race member having a concave spherical inner bearing surface and a spherical bearing member having a convex spherical outer bearing surface complementary to the concave spherical inner bearing surface of the outer race member and received therein. The outer race member has a longitudinal axis substantially perpendicular to the longitudinal axis of the valve member and a transverse center axis radially offset from the longitudinal axis of the valve member. An eccentric output shaft of the rotary force motor extends substantially perpendicular to the longitudinal axis of the valve member for receipt in a longitudinal bore in the spherical bearing member.

Abstract: This invention relates to a platform and more particularly to a vertically adjustable safety platform assembly for obtaining safety railing enclosed access to the tops of mobile equipment of various heights such as tank trucks and railroad tank and hopper cars. The assembly includes an elevated platform portion for obtaining access to the tops of mobile equipment, and a ladder for obtaining access to the platform. The platform is mounted on a column on guide rails, such platform being power driven by controls either from below or from the platform. The platform includes safety railings along the perimeter of the platform which extend beyond the perimeter so that when the platform is positioned on top of the mobile equipment a safety railing enclosure is provided.

Abstract: The invention relates to a dental device including an elongate structure having opposite parallel sides, each side having a leading edge surface for wiping against a tooth surface or gum surface, each side having an outer surface for simultaneously wiping against the proximal surfaces of respective teeth, the structure being resilient causing the outer surfaces to be resiliently urged against proximal areas of respective teeth, and a foam, abrasive, or adhesive material on part of each of the opposite sides of the structure. The invention also relates to methods for treating or cleaning teeth or gums.

Abstract: A sensor for an electrochemically active species, such as oxygen, uses more than two electrodes, namely, at least a working electrode, counter electrode and reference electrode. The sensor preferably is substantially planar, is made using thick film or thin film technique and accordingly may be very small. With the sensor in an electrolyte balanced reverse reactions occur, respectively, at the working and counter electrodes while no reaction occurs at the reference electrode, which is maintained in equilibrium with the electrolyte, and voltage between the working the reference electrodes is maintained constant. Current flow between the working and counter electrodes, then, provides an accurate, stable representation of species concentration.

Abstract: A window assembly is formed of an inside facing vinyl extrusion portion and an outside facing aluminum extrusion portion which are interconnected by resilient snap-fit barb-like connectors integral with each extrusion, thus forming a composite type construction. The metal outside facing portion provides strength, durability and weather resistance; while the vinyl inside facing portion improves thermal insulation characteristics, reduces or eliminates sweating, and enables color, pattern, and other design aesthetics conveniently to be included in the window assembly. The window assembly may be virtually any type, such as the fixed light (window glass) type, sliding type, double hung type, picture type, etc.

Abstract: A time piece comprising a cylindrical casing formed of transparent material which is closed at its bottom end by a bottom cover on which is mounted a clock movement whose output spindles are drivingly connected by plates to respective drum-like members provided on their outer peripheries with indicia, representing time, the drum-like members being concentrically arranged so that their indicia can be viewed through a window provided on a sleeve mounted on the casing, the inner side of the sleeve comprising a non-transparent sheet which is cut-away in the region of the window. The time is read off the drum-like members in a vertical direction.

Abstract: An ejector device having large evacuation capacity comprises a cylindrical body the cylinder face of which is subdivided into ring shaped chambers which extend around and are partitioned off from an empty space at the center of the cylinder. The said chambers are interconnected in succession to one another by ejector nozzles seated co-axially to one another in the partitions between the chambers. There is also provided an inlet into the device for a pressure medium and an outlet from one of the chambers. The cylinder is inserted into a sleeve which tightly encloses it and closes the chambers.

Abstract: A training apparatus and method for training a martial arts student. A pair of simulated limbs are designed to strike blows against the student in a way that requires great skill on the part of the student to defend against the blows. The blows are directed at the student with considerable force, and from a variety of different angles, thus requiring great dexterity on the part of the student to defend against the blow. The limb members are supported in a way that allows them many degrees of movement. Specifically, the limb members are each connected for universal movement relative to a support. In addition, each of the limb members can pivot relative to the means that connects it for universal movement relative to the support. Still further, the support itself has several degrees of movement to provide additional ranges of movement for the limb members. A spring arrangement resiliently biases the limb members towards a neutral position relative to a student positioned in a striking area.

Abstract: A window assembly includes an integrally molded sash, sill, frame and exterior trim unit and wooden interior trim parts fastened to the interior side thereof. An insert such as glazing material is held in place by a wooden interior sash which presses the insert against a peripheral surface of the molded unit. The interior sash is secured in place by screws driven into bosses surrounding the insert. An integral nailing flange extends outward from the molded unit and forms a rigid flashing which is intended to fit against the sheathing of an exterior wall and subsequently covered by the exterior siding. The nailing flange serves to locate the window assembly in the wall, and has holes therein through which nails may be driven to hold the window assembly in place.

Abstract: A printer for use with a data processor and a ribbon cartridge for use in the same are disclosed. The cartridge has at least two separate ribbon supplies which may differ in the type of ink on the ribbon (MICR vs. ordinary) and/or in color of ink or otherwise. A mechanism moves the cartridge along a straight line path to index selectively an active portion of each of the ribbons to a position aligned between a printhead and a platen for printing through the selected ribbon. A ribbon drive mechanism drives at least one of the ribbon supplies only when that ribbon supply has been selectively indexed to be printed through. In one embodiment a Magnetic Ink Character Recognition ribbon supply is driven between take-up and supply reels only when it is indexed for printing, while a multi-strike ribbon with ordinary ink is driven continuously. In another embodiment only one of two or more ribbon supplies is driven at one time.

Abstract: A writing board for use as an accessory to a brief or attache case has a main housing and four telescopically received auxiliary panels. The auxiliary panels may be telescoped outward to form together with the main housing a large surface on which to rest papers and files or telescoped into the housing in overlapping relationship to form a compact unit readily stored within a brief or attache case. The housing is formed of three parallel plates spaced apart to form two passages in each of which a pair of auxiliary panels is received. Strips of panel material, metal channels or special clips may be used to hold the plates of the housing in proper spaced relation. The two lateral auxiliary panels include pockets to secure papers and the edges of one auxiliary panel and the housing include lips to limit slippage of papers or writing tools into a seated user's lap.

Abstract: Curable epoxy resin compositions are described which comprise a mixture of an acid curable epoxy resin and a minor amount of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin. The curable epoxy resin composition may contain solid particulate materials. The procedures for curing such epoxy resins as well as methods for forming sand cores and molds also are described. Sand cores and molds produced in accordance with the method of the invention have sufficient strength and hardness after a few seconds of curing for normal foundry applications.

Abstract: A pivotable and slidable window assembly includes one or more sashes slidable in parallel, coplanar horizontal tracks. Each sash carries a pair of pivot members extending in opposite directions from the sash to define a pivot axis for swinging the sash out of its usual sliding plane for cleaning or the like of both sides of the sash. Each pivot member is slidably received in a respective one of the tracks, and each includes a foot extending in the plane of sliding movement of the sash and perpendicular to the pivot axis. Each track includes an opening to receive the foot of a respective pivot member when the sash is pivoted for cleaning. Upon pivoting of the sash and movement of the feet into the respective openings, contact between the feet and the openings stabilizes the sash preventing further and unwanted sliding of the sash in the tracks. Thus the sash cannot twist catercorner with respect to the tracks and is prevented from falling out while pivoted.