Abstract: A filtering unit for a bus, the unit comprising one outer housing of a size to fit between the row of seats in the bus and a forwardly facing wall of a bus lavatory behind the seats, the housing having air inlet and air outlet openings for communication with ducts opening in upper and lower portions of the lavatory. The housing comprises a main housing body with an interior horizontal passageway of consistent cross sectional shape extending parallel to the rear of the outer housing, the main housing body having a horizontally facing opening at the outer end thereof which is covered by a panel which is movable to expose said opening, and a drawer unit slidable into or removable from said passageway through said opening. The drawer contains at least an air filter for removing at least lavatory odor-causing gaseous and particle materials from the air stream passing therethrough and an air circulating fan and drive motor therefor.

Abstract: A hand-held spray unit includes a main body preferably having a pistol grip handle depending therefrom with a passageway having an inlet at one end and a nozzle outlet at an opposite end and a mixing chamber adjacent the outlet end with a valve to control one of the handles to control flow of a pressurized fluid. A specially-designed supply container is preferably releasably mounted on the top of the body and has a horizontally elongated tapered funnel-like profile which slopes down toward the front end thereof and extends forwardly and rearwardly of the handle to provide a balance weight of the contents of the supply container. The front of the container has an outlet communicating with the mixing chamber. A rectangular interlocking connection between the container and spray unit body provides a positive releasable interlock therebetween.

Abstract: In a magnetic tape device including a cam, an operating member driven by the cam against force of an energizing member to bring a head to a position for press-fitting a tape, and a changeover member actuated by the cam for changing tape feeding direction, an improvement which comprises an electromagnetic plunger, a control member for linking the cam and the operating member to actuate the operating member in press-fitting position upon energization of the electromagnetic plunger and for releasing transmitting relation between the cam and the operating member both in the press-fitting state and in the middle of the press-fitting action upon deenergization of the electromagnetic plunger, and a link member for linking the cam and the changeover member during action of the operating member, thus not cancelling transmitting relation between the cam and the changeover member even if the action of the operating member is cancelled during action of the changeover member.

Abstract: An ejection mechanism for a tape player includes a guide arm vertically movably supporting a pack guide, a pack stopper connected to the guide arm for frontward and rearward movement, an ejection link connected to the guide arm, and an inversion spring provided connecting the pack stopper to the ejection link to draw and eject a cassette. The ejection mechanism further includes an ejection member disposed along a lateral wall of the frame and mounted for frontward and rearward movement and biased forward by first revival spring, and an operation member similarly disposed alongside the ejection member and similarly mounted for frontward and rearward movement with respect to the frame and biased forward by second revival spring, and an operation rod coupling the ejection link to the motion operation member. An automatically releasing latch couples the ejection member to the operation member during the inward stroke of the ejection member.

Abstract: A cervical dilator assembly features a captive extraction element in the form of a collar press-fitted over one end of an insertion element made of the self-swelling vegetable stalk laminaria japonica. A withdrawal cord is affixed to the collar, the collar being captively retained in the swollen condition of the inserted dilator element so that pull on the cord causes withdrawal of the inserted dilator element without rupture or tearing thereof. In the preferred form of the invention the collar is fabricated in the form of a migration-limiting disc.

Abstract: The camera preferably has a slotted take-up spool which when the film compartment covering door is opened is automatically rotated into an ideal position where a hook in a film-capturing slot thereof has an outward facing orientation ideal for capturing a film leader perforation when the film leader is inserted therein. The slot is preferably configured as a lengthwise passage leading into a hollow axially disposed chamber within the take-up spool, the trailing edge of the slot nearest the imaging station being provided with the hook. This edge is positioned so that it does not come into confronting engagement with the film during initial advance thereof until the film is firmly captively secured over the hook.

Abstract: A PSK demodulator, by which a first output signal obtained from a local oscillator circuit working asynchronously with respect to the carrier phase of an inputted burst PSK signal and a second output signal shifted in phase by 90.degree. with respect to the first output signal are multiplied by the inputted burst PSK signal by means of a first multiplier and a second multiplier, respectively. Each of the output signals from the first and second multipliers are compared with a first reference voltage and a second reference voltage, which is lower than the first reference voltage. The output signals are classified into 4 sorts of level signals, those which are higher than the first reference voltage and those which are lower than the second voltage; and thus the inputted burst PSK signal is demodulated by using these 4 sorts of level signals.

Abstract: In a display sign including a plurality of rotatable display elements to be flipped between opposite extreme display positions, a bidirectional limit stop for stopping the motion of said display elements at said extreme positions is configured in the form of a bidirectional pendulum. The limit stop is preferably formed by an oversize sleeve coaxially disposed with respect to and depending from a smooth-surface horizontally disposed support member. The rotatable display element is preferably generally planar and configured to strike the opposite sides of the outer surface of the pendulum-forming sleeve along a line passing below the point of support thereof. The resulting pivoting and rotating movement of the pendulum serves to absorb a substantial portion of the angular kinetic energy of the rotating display element, thereby suppressing rebound.

Abstract: An ejection mechanism for a tape recorder has a driving gear driven by a motor and an intermittent gear including a cam portion and disposed so as to engage with said driving gear, in which an operation link is driven through a commuting element having a follower, which is in contact with said driving gear and an eject lever is driven by said operation link so that an eject operation is effected by the motor, and is characterized in that a cassette guide and a pivoting frame for it are connected to an eject element interlocked with said eject lever, a cam edge of a swing lever being in contact with an engaging portion formed in said pivoting frame, a stopping portion and a locking portion being disposed at each of the sides of said cam edge, further including a spring energizing the eject force in the course of the cassette insertion and being disposed between said swing lever and the frame of the recorder.

Abstract: The pushbutton tuner includes a connection member which connects a memory slide plate for transverse displacement in response to tuning operation to a change lever responsive to the memory slide plate to actuate a tuning circuit element. The connection member particularly consists of first step for engagement with the memory slide plate, second step for engagement with the change lever, and a flat portion connecting the both steps.

Abstract: A miniature electrical fuse designed for at least 60 volt circuit applications in printed circuit application features protection against housing explosion under fuse blowing conditions by means of arc barrier-forming shroud members formed by confronting rigid arc barrier walls of base and cover members between which end terminals of the fuse are sandwiched. The walls form arc barriers which closely confront or contact the fuse wire on all four sides thereof ahead of the points where the fuse wire ends are connected to the terminals. These points of connection are advantageously out of alignment with the rest of the fuse wire. The terminals preferably extend from the confronting ends of the base and cover members where projections from the cover bearing on the terminals secure the terminals in place and seal the openings thereat.

Abstract: A door mechanism for a cassette insertion opening in an audio device comprises an inner door pivotally supported along one edge of the cassette insertion opening; an outer door pivotally supported along the opposite edge of the cassette insertion opening and having depressions formed along the edge remote from the pivotal axle and a packing member attached to the periphery of the inner face for forcible contact with the wall surrounding the cassette insertion opening; lock means consisting of lock arms engageable with the depressions of the outer door when the outer door is closed and unlocking arms actuated by the inner door when the inner door is fully opened, the lock means being always biased to the position for locking the outer door and being rotated to the unlocking position upon the actuation of the unlocking arms by the fully opened inner door and upon an operation of a door opening button provided on a front panel of the audio device, for example.

Abstract: A plug-in fuse assembly comprising a housing made of insulating material and includes upwardly extending side walls bridged by upwardly extending end walls, and a conductive plug-in fuse element secured in the housing. The conductive plug-in fuse element has parallel confronting terminals projecting downwardly from the bottom of the housing. The housing end and side walls uniquely have outermost vertical coplanar wall surfaces, preferably at the sides and top margins thereof, which are parallel to the housing sides involved and to the corresponding outermost vertical coplanar wall surfaces on the opposite end or side of the housing. The outermost vertical coplanar wall surfaces are adapted to engage the complementary outermost vertical wall surfaces of an identical plug-in fuse assembly placed with the identical end-to-end or side-by-side orientation besides it.

Abstract: An electrical fuse features a pyrotechnic smoke-generating mixture supported proximate to or adheringly supported on a meltable fuse wire element. A portion of the fuse housing is transparent. Upon either low current or high current blowout the local temperatures attendant thereto cause ignition of the pyrotechnic mixture and evolution of a cloud of colored smoke which deposits on the interior of the transparent portion of the housing to yield a readily visible indication that the fuse has blown. Additionally, when the fuse is operated at temperatures close to blowout conditions, a different colored smoke is produced to indicate incipient fuse deterioration.

Abstract: A completely mechanical disc film camera features film advance and shutter actuation by direct mechanical coupling to an external shutter release button. Shutter button actuation is automatically blocked after the fifteenth frame so as to prevent double exposure and film tearing. Selective film-flattening back pressure is applied to the disc film cassette during the terminal phase of the shutter depression stroke immediately prior to shutter tripping so as to hold the film in the proper imaging plane. Back pressure is released during the film advancing phase to as to relieve system loads and avoid film scratching. The film advance is secured by the oscillatory movement of a film notch engaging pawl carried by a claw driven into oscillatory motion by operation of the shutter button. Means are provided for coupling additional mass to the claw during the terminal phase of the film advancing stroke to reduce the speed of film advance, thereby providing protection against film overtravel.

Abstract: In a preferably cylindrical sheet metal casing to be hermetically sealed and having a thinwall portion, the improvement in a vent for the casing which ruptures when internal casing pressure exceeds a given value, the vent including at least one vent-forming rib projecting outward from a circular end wall thereof, said rib having formed therein a vent-forming groove which extends transversely of the length of the rib only part way along the transverse contour thereof, so that the groove ends are spaced from the base of the rib preferably a distance at least equal to the end wall thickness.

Abstract: A surface acoustic wave device comprises a piezoelectric substrate, a pair of transducers provided on the piezoelectric substrate, a center electrode provided in the center between the both transducers, first shield electrode provided between one of the transducers and the center electrode, and second shield electrode provided between the other transducer and the center electrode, with placement substantially represented by: ##EQU1## where l.sub.1 is the width of the individual shield electrodes, l.sub.2 is the distance from the individual shield electrodes to the center electrode, .lambda..sub.0 is the wavelength of a surface acoustic wave at the center frequency, and n.sub.1 and n.sub.2 are whole numbers.

Abstract: A double-exposure prevention system for a still camera having a cockable spring-biased linear movable shutter-actuating slider operable between a cocked condition and held thereat by a latch movably responsive to a manually operated release member and thereafter upon release of the latch to a shutter-actuating position is provided with means for allowing one end of the slider to be rotated out of and away from the axis of the shutter-actuating movement throughout most of the subsequent rewind operation. While in this second angular position, the slider disables the operation of the release member, preventing accidental tripping of the latch after a cocking condition has been restored. During a small terminal portion of the film advance and after the preceding frame has been safely advanced so as to be out of the way, the film advance mechanism then rotates the slider back to its initial position.

Abstract: A fuse (12) for protecting a circuit and comprising a tube (14) of insulating material having an inner wall surface (16) and an outer wall surface (18) so as to form a fuse housing. The fuse includes two opposite axial ends (20) and (22), and a first (24) and a second conductive fuse terminal (26) are secured to the tube adjacent each of those opposite axial ends, respectively. Serially-located elements (28) are disposed within the fuse housing and provide electrical continuity between the first fuse terminal and the second fuse terminal. The elements comprise stressed spring means (30) and resistor means (32), with the spring means having a proximate end (40) secured to the fuse adjacent the first fuse terminal and a distal end (41) secured through a meltable junction (34) to the resistor means.

Abstract: Sheet feeding apparatus with an adjustable stack support in confronting relation to a feed opening able to accommodate sheets of various widths, so that one or more stacks of sheets can be supported along the feed opening with the longitudinal center line of any stack being positionable along different selected points along the length of the feed opening. At least about eight selectively controlled suction cups are aligned parallel to the length of the feed opening and encompass most of the opening engaging the bottom surface of the bottom sheet in any stack of sheets and withdraw the sheet from the stack. The spacing between contiguous margins of the suction cups is much less than about two diameters of each cup. The suction cups are preferably supported on the top of a pneumatic tube and are raised with the tube to engage the bottommost sheet in the stack. The pneumatic tube is mounted for pivotal movement upon a rockable carrier framework.