Abstract: A resettable combination lock includes a plurality of user depressable buttons and a user-settable interposers for coupling selected ones of the buttons to a first button-actuation counter that counts correct button depressions and the other of the buttons to another button-actuation counter that counts incorrect button depressions. In addition, each button is coupled to a third counter that counts the total number of button actuations. In order to effect unlocking, the correct button sequence must be pushed to cause the first counter to count the proper number of correct button actuations and the third counter to count the proper number of button actuations without registering a single count on the second counter. The incrementing of a single count on the second counter, which indicates the depressing of a button not in the unlock sequence, will prevent the lock from being unlocked.

Abstract: An electric motor has in combination a rotor having two permanent magnets of different polarities, two Hall generators responsive to the magnetic fluxes generated from the respective permanent magnets to produce different electric signals, two comparator circuits each arranged in combination with each of the Hall generators and operated in response to the resultant outputs, a logic circuit operated in response to the outputs of the comparators to produce the resultant outputs and a 3-phase inverter circuit having first, second and third stages each having two inputs and one output, the inputs of the first stage being connected to the outputs of one of the comparator circuits, the inputs of the second stage being connected to the outputs of the other of the comparator circuits and the inputs of the third stage being connected to the outputs of the logic circuit, the first, second and third stages having the outputs connected respectively to the delta connection points of coils wound around the electrodes of ar

Abstract: A mounting for quickly removing and replacing cutter teeth on a rotary drum includes a cutter tooth socket mating with a socket housing defining a tapered channel having a base surface and a lateral surfaces inclined with respect to the longitudinal axis of the tapered channel and oriented at an acute angle with respect to the base surface to retain the cutter tooth socket by a wedging action. The cutter tooth socket is also retained on the socket housing by a spring retainer seated in a recess in the base surface and engaging a protrusion depending in a groove defined by the cutter tooth socket. A leading side of the cutter tooth socket with respect to the direction of cutter movement contains oblique surfaces to cam to the side the material of the surface being cut. A dummy cap is inserted in socket housings from which the cutter teeth sockets have been removed and extends beyond the socket housings toward the surface being cut to protect the socket housings from wear by the work surface.

Abstract: A printer having a print ribbon feed mechanism is disclosed which allows optimal feeding of a print ribbon, eliminating unnecessary consumption of the ribbon. The mechanism includes first and second clamp means mounted on a stationary section and a print carrier of the machine, respectively, which are both controlled in accordance with movement of a print head from and to a print enabling position. Means are provided which are connected to a carrier indexing mechanism for impositively driving print ribbon supply and takeup spools disposed on the stationary section to wind a print ribbon onto them during a carrier return operation whereas they allow the ribbon to be unwound from the ribbon spools when the carrier advances.

Abstract: A method and apparatus for restoration of teeth using light curable restoratives while assuring interproximal contact between the restored tooth and an adjacent tooth. The apparatus is in the form of a triangle-like block defining two arms converging at a common point and which are of a different length. The longer of the two arms is provided with a camming surface on the end thereof opposite from the common pointed edge whereas the shorter of the two arms is provided with an abutment surface on the end thereof opposite from the common pointed edge. A tooth cavitation opening through a vertical tooth surface about which a matrix band has been tightened is filled by alternate deposition and curing of successive layers of the light curable restorative to a level at or below the plane of the maximum circumference of the tooth.

Abstract: Through a pattern mask, small sections of a semiconductor wafer are exposed successively to light radiated from a mercury-vapor lamp in high-level steps, during each of which the power consumption of the mercury-vapor lamp is at a high level, by continuously lighting the mercury-vapor lamp and repeatedly alternating each of the high-level steps and a low-level step during which the power consumption of the mercury-vapor lamp is at a low level. As the mercury-vapor lamp, there is used a mercury-vapor lamp in which mercury is filled in such a large amount that when lit in the low-level step, the mercury vapor pressure in its envelope is below 96% of the saturated mercury vapor pressure at that time. Use of such a mercury-vapor lamp is effective in avoiding the occurrence of incomplete lighting state when its power consumption is changed from the low-level step to the high-level step.

Abstract: Through a pattern mask, small sections of a semiconductor wafer are exposed successively to light radiated from a mercury-vapor lamp in high-level steps, during each of which the power consumption and discharge current of the mercury-vapor lamp are at a high level, by continuously lighting the mercury-vapor lamp and repeatedly alternating each of the high-level steps and a low-level step during which the power consumption and discharge current of the mercury-vapor lamp are at a low level. The alternation of the high-level step and low-level step is effected while controlling the magnitude of each of the overshoot and undershoot in the waveform of the discharge current for the mercury-vapor lamp below 10%. The exposure method of this invention is effective in avoiding or minimizing the wearing of electrodes of a mercury-vapor lamp. Thus, the mercury-vapor lamp can enjoy long service life while permitting stable exposure over a long period of time.

Abstract: Tunnel freezer for freezing products which are transported through the tunnel freezer from an infeed end to an outfeed end. Close to the outfeed end of the tunnel spray nozzles are provided for spraying the products with liquified nitrogen or similar cryogenic liquid. The tunnel comprises circulation fans positioned upstream of the nozzles. The circulation fans comprise at least one paddle wheel positioned immediately above the products. The paddle wheel has paddles, the radial length of which is 20 to 60%, preferably 50%, of the radius of the fan wheel. Preferably also a fan wheel is arranged below the conveyor between the two paths of the conveyor, whereby the paddle wheel is driven by e.g. a chain or belt transmission. Moreover, the tunnel is divided in compartments by partitions, whereby the partition positioned at the infeed end of the fan wheel is positioned closer to the fan wheel than the partition which is positioned at the outfeed end of the fan wheel.

Abstract: In a refrigerating machine, a reservoir heated by an electric motor driving a compressor contains oil up to certain level. The reservoir is fed with refrigerating liquid complemented with oil. The liquid vaporizes while oil falls down in the liquid state. A number of lubrification conduits connect individual bearings of the compressor with the reservoir above the oil level on the one hand and with the reservoir below the oil level through a micro-orifice on the other hand, so as to send to the bearings refrigerating gas loaded with an oil mist. The bearings are in fluid communication with the intake of the compressor.

Abstract: Structures, such as pressure vessels or pipes, for the storage and transportation of fluids under pressure are wrapped with a composite material including a high-strength unidirectional filament material in a matrix of a flexibilized isophthalic polyester resin which has an elongation at least equal to the elongation of the material of the structure. The index of refraction of the resin is matched to the index of refraction of the filament material so that the pressure vessel is visible through the wrapping. The resin discolors when exposed to a heat above which the material of the structure weakens, thus acting as an indicator that the structure is unsuitable for use.

Abstract: Procedure and plant for spray drying absorption of flue gases by separation of SO.sub.2. A suspension of finely-ground limestone is added to a reactor via an oxidation and acidification unit, where the finely-ground limestone is mixed with recirculated solids and air, oxygen and/or some of the flue gases. Preferably, the recirculated solids is also subjected to reactivation by wet-grinding.

Abstract: In a screw volumetric machine, a slide is slidable in a groove along a bore accommodating the screw. This slide is movable to vary the delivery and/or compression ratio. One end of the groove communicates with the low pressure. The other end of the groove communicates with the high pressure. A separation wall separates the two pressures behind the slide. The slide is leak-tightly urged against a free end of the separation wall by holding means which slidingly retain the slide in the groove.

Abstract: Disclosed herein is a process for forming a singlecrystalline silicon layer by heating a wafer having a starting silicon layer of amorphous or polycrystalline silicon on the singlecrystalline silicon substrate, in accordance with the epitaxial growth technique. The process comprises providing a heat source comprising a plurality of tubular lamps provided in a parallel second plane above a first plane in which the wafer is placed; lighting the tubular lamps to radiate their light to the wafer so as to hold the starting silicon layer at 1100.degree.-1400.degree. C. for 4 seconds or longer; and then, radiating light from a specific lamp to a portion of the starting silicon layer of the wafer where the temperature of the portion of the starting silicon layer is raised to 1410.degree.-1480.degree. C. and to form a narrow molten region and forming the same narrow molten regions successively one after another in the wafer.

Abstract: Disclosed herein is a process for forming a single crystal silicon layer by heating a wafer, which is made of a single crystal silicon substrate and a starting silicon layer made of amorphous or polycrystalline silicon and provided on the silicon substrate, in accordance with the epitaxial growth technique.

Abstract: A multi-purpose power tool well suited for use by sportsmen for dressing game, such as fish and/or fowl, includes a hand-held drive unit having both a reciprocable output coupling and a rotary shaft output coupling to which reciprocately driven cutting or sawing blades may be selectively attached or to which rotatively driven fish descaling or defeathering implements may be attached. In accordance when one of the features of the present invention, the defeathering accessory is mounted over and driven by the fish descaling accessory.

Abstract: A band saw (1) for slicing e.g. deepfrozen fish blocks. The band saw comprises two drums (10) arranged on a frame (11) and at least two saw blades (12), which run over the drums beside each other. The saw blades pass through one or several parallel blade guiding units (13) where they are twisted or inclined a predetermined angle (x) relative to the axis of the drum. The guiding unit (13) comprises cylinders (25) having inserts (20-22) which positively guide the saw blades parallel to each other. The cylinders (25) are locked in place by washers (19), which are positioned and aligned by an alignment tool.

Abstract: An electric rotary device of permanent magnet type has a stator including a plurality of permanent magnets and a rotor rotatably mounted within the stator and including an armature core and a plurality of windings wound around the armature core, said permanent magnets each having an axial length in the direction of the central rotation axis of the rotor, said axial length being a maximum at the center of the permanent magnet and progressively reduced towards both side ends of the permanent magnet.

Abstract: A slipper is formed with a sole defined by an outlined edge and having a predetermined length from the front end to the back end thereof, the sole being composed of a toe of a predetermined width defining the front end thereof, a foot inserting part having a predetermined minimum width located adjacent to the toe and progressively and symmetrically enlarged to a predetermined maximum width from the toe toward the back end of the sole, the foot inserting part having pressed bend lines extending slightly inside and along both edges thereof respectively to define the opposite marginal parts which may be spontaneously bent up when pressed to each other, a reduced part having both sides connected to the end of maximum width of the foot inserting part by edges extending with an acute angle from the end of maximum width of the foot inserting part to the reduced part on both sides thereof, a heel part progressively enlarged from the reduced part toward the back end of the sole.

Abstract: A method for heating a semiconductor wafer having a first region to be heated and a second region requiring no heating thereof, which method comprises forming a film over at least one of the first and second regions so as to make the reflectivity of the surface of the first region smaller than the reflectivity of the surface of the second region, and then exposing the semiconductor wafer to a flash of light to heat same. The above method permits selectively heating the region which is required to be heated, and, at the same time, to avoid any overheating of the region where no heating is required. The above heating method is particularly effective for annealing a semiconductor wafer which has a large surface area.

Abstract: A membrane innerly divides a body in two rooms, one of which is subjected to a first pressure of the ratio of pressures which is to be compared to a threshold. In the other room, there is a gas in pressure equilibrium with its condensate; this gas is in thermal contact with another gas which is also in pressure equilibrium with its condensate and which is subjected to the second pressure of the pressure ratio. The forces on the membrane balance each other when the ratio equals the threshold. The threshold is equal to the ratio between the pressure of the two gases in equilibrium with their condensate. This threshold is substantially stable when the temperature varies. The membrane is connected to control means.