Abstract: A damper disc applicable to a clutch disc comprising a hub flange; a pair of annular side plates; a pair of annular sub-plates disposed between the side plates and the flange; stud pins connecting the subplates together; recesses formed at middle portions of the side edges of the openings in the flange, each stud pin passing through each recess with a space corresponding to a torsion angle for first hysteresis torque between the stud pin and the side edge of the recess; stop pins connecting the radially outer portions of the side plates together; notches formed at outer edges of the openings in the flange, each stop pin passing through each notch with a space corresponding to a maximum torsion angle between the stop pin and the side edge of the notch; and thereby, a maximum torsion angle can be set large, and the sub-plates can operate stably.

Abstract: An ignition-operated combustion power unit wherein the flywheel on the crankshaft of the power unit can transmit torque to the pressure plate of a friction clutch whose cover carries an ignition point indicator. The cover can be connected to the flywheel in a single predetermined angular position of the cover and flywheel relative to each other so that the indicator is invariably maintained in one and the same angular position with reference to the crankshaft when the cover receives torque from the flywheel.

Abstract: A double actuation coin slide system is provided which is associated with a coin slide housing. A sequential controller is associated with the coin slide housing and is energizable for controlling a timed sequence of operations. A power source provides electrical power between a pair of conductors for energizing the sequential controller. A switch is associated with one of the electrical conductors and is actuatable for selectively connecting or disconnecting electrical power from the power source to the sequential controller. A coin slide is mounted on the coin slide housing and is movable from a coin receiving position to a position for rotationally advancing a shaft portion of the sequential controller. The coin slide is operable through a first coin slide insertion cycle for effecting actuation of the switch to disconnect the power source while conditioning the sequential controller for energization by advancing the shaft portion.

Abstract: A method and apparatus for coin examination which transmits on one side of a coin a low frequency electromagnetic field from a transmitter inductor which is part of a transmitter circuit, monitors the frequency of the low frequency electromagnetic field, receives a portion of the field on the other side of the coin with a receiving inductor which is part of a receiving circuit, measures the phase shift between the transmitted signal and the received signal, and determines if the measured phase shift corresponds to the phase shift for an acceptable coin at the monitored frequency.

Abstract: Horizontally conveyed flat glass articles are halted and oriented in a precise location. Vertical stop pins removably affixed to a table attached to one end of the apparatus arrest the leading edge of the moving article whereupon pins removably mounted in a pair of transversely movable tables advance toward the article substantially normal to its arrival direction, thus engaging the edges of the article and orienting it in a vise-like manner. Lastly, adjustable pins mounted in a vertically and longitudinally moving table engage the trailing edge of the article and urge it toward the stop pins, thus orienting and aligning the article in a precise position relative to a fixed reference point. The apparatus is particularly adapted to the precise orientation and alignment of pattern cut sheets of glass to be removed from a conveyor platform by a robot.

Abstract: A bucket conveyor assembly includes both a bucket endless conveyor and a cover endless conveyor, with the cover endless conveyor being located inside a horizontal section of the bucket endless conveyor. The cover endless conveyor is driven so that covers (40) mounted on its lower flight are superimposed with gaps (44) between buckets (24) mounted on the bucket conveyor at a loading zone (26). Material to be loaded into the buckets is gravity-fed between the top and bottom flights (36A and B) of both the bucket endless conveyor and the cover endless conveyor and dropped into bottom-flight buckets (24) through the bottom-flight covers (40). The covers have an unsymmetrical inverted V-shape, with the leading side (46) of the V being on a steeper angle than the trailing side (48) of the V.

Abstract: This disclosure is concerned with improved conveyor elevator apparatus employing closed-loop horizontal main conveyors carrying vehicle-supporting platforms with the aid of followers that track follower channels extending in staggered fashion with the main conveyor channels, and employing novel direction-changing transverse end portions at which auxiliary conveyors engage the followers and insure horizontal stability of the platforms in their vertical travel through the transverse direction-changing end portions.

Abstract: A cellular basket-style carrier has a pair of side walls (2, 3) one of the side walls (2) having a base panel (5) hinged thereto and the other of the side walls (3) having a connecting flap (10) hinged thereto and joining the base panel to the other side wall (3). Medial panels (14, 14a; 18, 18a) together provide both a central longitudinal partition structure (5) of the carrier and transverse partition structures on either side of said longitudinal partition structure. Each of the medial panels (18, 18a) associated with the other of the side walls (3) has a separator panel (46, 46a) hinged thereto which together provide a multiply separator (M) centrally of the carrier in the plane of said longitudinal partition structure.

Abstract: A tamper proof anti-theft reel package for a fishing rod having a handle and a reel mounted thereon comprises a unit molded sheet of clear plastic material having a tubular body to extend around the reel handle. A pair of opposed cup shaped reel enclosing halves extend from the body as a continuation thereof and terminate in peripheral engaging flanges which are secured together.

Abstract: A storage device for flat recording media, e.g., compact discs, is disclosed. The device comprises a housing and a slider member having a base portion and front wall that covers the open front face of the housing when the slider member is inserted. A lifting element, which is transported out of the housing by means of the slider member, is provided for supporting the recording media in a position for easy insertion and removal.

Abstract: Wafer cassette for processing of wafers which includes a plurality of open supported wafer dividers for supporting a plurality of wafers in alignment in opposing dividers of the cassette for automated processing of the wafers while in the cassette. The wafer cassette utilizes an H-bar end with a configured rod reinforced open front which is fully functional and strategically located. The dividers are supported by longitudinal horizontal supports secured to the ends providing for open area between each of the dividers for passage of liquids during automated processing. The cassette provides open area about the H-bar end. The rear end which includes a downward arch and through the dividers for open, non-restricted automated processing of wafers. The processing wafer cassette provides for "on-center" processing where the carrier center of gravity is on-center of the axis of centrifugal wafer processing machinery.

Abstract: A bag pack of a plurality of stacked thermoplastic bag structures each bag comprising a front and rear bag wall and an open mouth top portion. Handles are integral extensions of the bag walls. The bags are bonded together via bonding means in association with said handles. Individual bags may have stress relief curves in the handles and the bag mouth opening.

Abstract: Image processing apparatus for detecting a bounded region of an image includes a scanning device such as a T.V. camera, to scan the image via a raster scan to produce a signal indicative of image intensity at a plurality of picture points and comparators to compare the image intensity at each of the picture points with that of a neighboring point in each of at least two directions to derive therefrom a difference value and thereby detect a positive-going or negative-going boundary. Picture points are labelled as corresponding to region boundaries whenever the difference values exceed a predetermined threshold value. The region boundaries are then expanded by labelling further picture points as region boundaries. All boundaries in a particular direction are expanded in the same direction irrespective of whether they are negative-going or positive-going.

Abstract: A side-loading rack for storing wheeled container chassis in a nearly vertical, slightly leaning position has a framework of dividers defining plural vertical slots open on one or both sides for receiving a container chassis sideways in each slot. Each divider includes a chassis support arm which extends front to rear along an upper side of each slot. A wheel support on one side of each divider is positioned in a lower part of each slot to support the wheels of a container chassis so that the chassis frame leans at a small angle from vertical against the chassis support arm of an adjacent divider. Corner castings are positioned at opposite ends of the rack so that it can be handled in the same manner as a container. The dividers of one embodiment are constructed with an upper portion, including the chassis support arms, either removable from or collapsible into the lower portion of the frame means to form a more compact structure for ease of handling.

Abstract: A light weight mounting fixture is disclosed for use in supporting a plurality of articles, such as cylindrical cavity filters, of like length in a manner permitting rigidity of the articles to be employed to rigidify the fixture.

Abstract: There is disclosed a cornering device for a garment support structure which includes first and second horizontal transverse assemblies. The cornering device includes first and second horizontal support elements, each having a first and second end. Also included is hardware for suspending the first ends of both elongate horizontal elements from their corresponding transverse assembly and parallel thereto, such that the second ends of both elongate support elements comprise an acute angle. Further included are means for mutually securing both second ends of the elongate elements and, concurrently, suspending both second ends at vertical offset in a desired plane beneath the plane of said transverse assemblies.

Abstract: A foldable display stand, which can be constructed from a single sheet of material, has a back panel having a longitudinal slit therein, a pair of side panels each having first and second opposing edges, the first edge of each side panel hingedly connected to opposing side edges of said back panel such that each of said side panels can be positioned in substantially the same plane as said back panel; a front panel having first and second opposing sides hingedly attached to said second edge of said side panels, said front panel being in a plane substantially parallel to said back panel; a shelf hingedly attached to an edge of said front panel connecting said first and second sides of said front panel, said shelf extending from said front panel through said slit in said back panel, and biasing means for urging said side panels into substantially parallel planes.

Abstract: A rack assembly apparatus assembled by fitting panels and transverse beams to connection members, said apparatus characterized in that panel fitting plates consisting of two parallel panel fitting support plates are formed at the base of each of said connection members so as to project vertically from both surfaces and to define a panel fitting groove between said panel fitting support plates, an engaging protuberance is formed at the bottom of each of said panel fitting grooves, a transverse fitting groove is defined along the outer surface of said panel fitting plate, an engaging protuberance is also formed at the bottom of said transverse beam fitting groove, said panel and said transverse beam are equipped with engaging notches, respectively, said panel is fitted into said panel fitting groove of said connection member while said transverse beam is fitted into said transverse beam fitting groove, said engaging notches of said panel and said transverse beam are engaged with said protuberances of said conne

Abstract: An attachment jib for supporting various working devices, such as a pipe manipulator, includes a support base which can be rigidly coupled removably with existing elements on the nose block of a telescopic crane boom. The jib includes telescopic sections and its base section is pivotally mounted on the support base and is luffed by power cylinders on such base through a wide angle. The jib contains another power cylinder to control extension and retraction of its fly section carrying the working device. An optional work support platform pivotally connected to the support base may be used either with or without the jib.

Abstract: A flask for sterile liquids capable of supporting a terminal sterilization of pharmaceutical quality. The flask has a tamper-proof closure comprising a cap screwed on its neck and a locking ring formed in two parts axially superposed and joined by a breakable zone. One of the parts is axially carried away by the cap during opening of the flask and the other part is held axially by a shoulder formed on the neck. The cap encloses a seal made of elastomeric material inserted between its bottom and the edge of the neck, this seal being axially solid with the cap and comprising a skirt applying itself against the inner surface of the neck in a bacteriologically sealproof manner along a height sufficient to ensure a bacteriological closure seal until the locking ring is broken.

Abstract: A freight container (1), in particular a lightweight container (1) for air freight, having a support frame structure (3) which is secured to a container bottom (2) and which is formed from shaped bars or like strut members and which is at least partially covered or clad by a skin formed by sheet metal plates, fabric means or the like flat members, with a door (35) being provided within at least one area of the frame, is to be improved in such a way that it can be converted without cost into a so-called fork lift version and can also be restored to the normal version.For that purpose, provided in the interior (30) of the container, on the bottom plate (2), is an intermediate bottom member (52, 73) having channel-like shaped members (53; 72; 73) on its underside, the intermediate bottom member being releasably connected to the bottom plate and/or the support frame structure (3).

Abstract: An arrangement for opening and closing a cover of a transport- and treatment container has a toggle closure movable between open and closed positions in which it removes a cover from a container and applies the cover on the container, respectively, and a gripping device arranged to move the toggle closure between the open and closed positions and provided with two cams located at opposite sides of the toggle closure and engageable with the latter.

Abstract: A resilient seal located in and spanning the vapor space between a tank wall and a floating roof wall with the seal including a vapor resistant flexible strip of material having parallel longitudinal edges attached to the roof defining a horizontal pouch extending around the roof periphery and a horizontal coil spring located in the pouch for the length of the vapor space.

Abstract: A container having an opening which comprises a segment connected to the top of the container along an entire straight edge, and connected to the top of the container at other discrete points. The segment is covered by a piece of adhesive tape to seal the container. The tape has a tab for opening the container by bending the segment about the straight line connection. The container may be easily resealed by replacing the segment in the hole and by securing the tape against the top of the container.

Abstract: A closure for a food container which is constructed to visually indicate whether or not the container has been opened without authorization. The closure has a discoidal lid body and a peripheral skirt. A detachable lock ring is connected with the skirt along a weakened fold line which provides a hinge about which the lock ring is folded inwardly inside of the skirt. The rim of the container is rolled outwardly and has a free edge which interlocks with the lock ring to secure the lid on the container. The lid can be removed only after the lock ring has been removed by tearing it away from the skirt along the weakened fold line. Absence of or damage to the lock ring indicates unauthorized opening of the container or other tampering, while the presence of the lock ring confirms that the container has not been opened.

Abstract: A self-locking pilfer proof tamper evident container comprises two walled panels, within which walls are placed interlocking tabs when brought together to close the container in a manner whereby the container must be destroyed to gain access to its contents.

Abstract: A valve for a pressure bottle or vessel adapted to contain a dangerous fluid, such as a radioactive gas, can comprise two valve members in tandem which require actuation by separate operating members thereby eliminating the possibility for accidental or inadvertent opening. The main valve housing can be provided with a pressure equalization valve which opens when the bottle is immersed in a body of water at elevated water pressures to equalize the interior and exterior pressures while providing a water seal against escape of the bottle contents.

Abstract: A dispensing system comprising first and second collapsible storage containers, a pump and a pressure responsive selector coupled to both of the storage containers and to the intake side of the pump. The selector includes a valve movable between a first position in which the selector provides communication between the first storage container and the pump and blocks communication between the second storage container and the pump and a second position in which the selector provides communication between the second collapsible container and the pump and blocks communication between the first collapsible container and the pump. An actuator is responsive to the pressure drop at the selector resulting from the collapse of one of the collapsible containers for moving the valve from one of its positions to the other of its positions.

Abstract: A cartridge for simultaneously dispensing at least two different materials includes an elongated hollow housing having at least one partition extending laterally and longitudinally thereof to provide at least two chambers for holding the respective materials. A plunger sliding within the housing severs or slits the partition so that it can be stored during operation outside of the respective chambers. The partition may be coiled up or it may be directed laterally around the plunger so that it is stored adjacent an internal wall of the housing.

Abstract: A standard caulking gun is shown having two new features added thereto. The first feature is a replaceable razor blade that is clamped in a notched edge of one wall of the hollow trigger. In combination with the razor blade is a hole in an adjacent wall of the hollow handle. Over the hole is placed an adjustable adapter having various size angular openings for cutting the tip off of the nozzle of a caulking tube at a 45.degree. angle. The second new feature is an elongated pick built into the hollow handle to be retracted when not in use, and to be extendible for receiving the open nozzle thereover so as to pierce the seal of the tube.

Abstract: A two-piece dispenser for flexible plastic fluid-containing bags. An outer tubular sleeve has a flange attached to the sealed fluid-containing bag. The bore of the sleeve has two annular grooves, one adjacent the bag surface, the other with a semicircular cross-section and displaced within the bore from the first groove. The second piece is a coaxial barrel having sharp piercing points on a plurality of long, flexible blades, at least one of which carries a tooth extending radially from the surface for engaging the annular grooves. In the first or semicircular cross-sectioned groove, the tooth operates to strongly resist longitudinal movement of the barrel so that it cannot be accidentally removed or moved inward to pierce the bag. For dispensing, the barrel is forcibly pushed in to dislodge the tooth from the first groove, cause the blade tips to pierce the fluid-containing bag, and latch the tooth into the second groove to prevent any removal of the barrel from the sleeve.

Abstract: A collapsible dispensing container provided with a conical-shaped head portion having a central opening and a multi-laminate tubular body. One end of the tubular body is folded over and defines an annular space between the folded over part and the upstanding wall part of the tubular body. A disc-like barrier member is provided with a peripheral flange that is located in the annular space and heat sealed to adjacent parts of the tubular body. The tubular bodies are formed with a slight taper for nesting, resulting in ease of handling and shipping.

Abstract: A wall mounted soap dispenser made of plastic is described. The dispenser includes a hand-operated pump which dispenses liquid soap under pressure and which can be manufactured inexpensively. A disposable container of liquid soap is inserted in the dispenser to refill the dispenser. The pump has on its top a pan to collect liquid spilled as the disposable container is inserted. The pump and container are enclosed in a plastic housing which hinges from a plastic wall plate. A plastic latch with plastic key is used to lock the housing to the wall mounting plate. The pump mechanism uses a piston of two sections of different diameter and corresponding piston chamber of two sections of different diameter. There is an adjustable piston stroke length limiting mechanism. The piston is attached to the lever which moves the piston by means of a crossbar on the end of the piston rod. The crossbar is inserted in a slot in the lever and then turned to cross the slot.

Abstract: A lightweight, portable post-mix carbonated beverage dispenser unit for use in small offices or small-volume locations is described. Flavored syrup is supplied to the unit from disposable sealed syrup packages which are plugged into a dispenser valving system. CO.sub.2 is supplied to the unit carbonator system in returnable containers which also may be quickly plugged into a CO.sub.2 valving system. A thermoelectric refrigeration system may be provided to decrease noise and the number of moving parts or a mechanical freon system may be used. The unit construction may be modular for ease of repair. The cabinet is injection-molded from plastic. Water is supplied to the unit for mixing with the CO.sub.2 and syrup from a water reservoir which may be manually filled. The refrigeration system cools the water in the reservoir, as well as the syrup packages and carbonator tank.

Abstract: An apparatus for evenly distributing powdered and granular food product ingredients at a controlled and variable rate. A delivery tube communicates with the interior of a hopper that holds a supply of the ingredient and an auger causes the ingredient to move from the hopper and axially along the tube. The auger has a central body with a large diameter portion extending through the hopper, a small diameter portion disposed within the tube and a land extending along and around the body to define a generally helical flute that serves as an ingredient flow path of variable cross-sectional area. A series of non-circular openings arranged along the tube allow the ingredient to escape in a uniform manner, the effective size of the openings being variable by changing the relative rotational positions of the tube and an apertured sleeve that surrounds the tube. The positions of the openings is also variable by rotating the tube and the sleeve together to further improve the uniformity of distribution.

Abstract: A valved dispenser for use with a pump and tap assembly, for dispensing kegged beer and other beverages alternatively in the manner of a fountain dispenser or in the manner of a hand held dispenser, includes a first handle and portion of a cam actuating arrangement suited to hand held operation, and a second handle used in conjunction with the first handle and another portion of the cam actuating arrangement as well as retaining coupler elements on the pump and tap assembly and valve for effectively converting the dispenser to the fountain type. To reduce foam generation while dispensing, a stem guide is formed to permit fluid passing through the valve to flow around the guide for reduced flow velocity. A threaded valve seat element and push-back stem with ready access to a key pivot pin are included for simplified valve disassembly for cleaning and maintenance.

Abstract: A valve-and-lid assembly comprises a self-closing discharge valve constituted by a dome part, having a central opening, of a lid closing the open top end of a pressurized container and serving as the obturating member of the valve by obturating ducts through a valve disc of elastically resilient material which is lodged in the dome part. When opening the valve by downward or tilting pressure exerted with the aid of a tubulure or the like actuating member on the valve disc, the latter is deformed so as to establish free communication between at least one of the ducts therein and the hollow interior of the tubulure which can carry a conventional atomizer head having a spray nozzle.

Abstract: A bodyform, in particular a dressform, wherein a central support carries opposed pairs of body sections which are adjustable in spacing by means of adjustment mechanisms mounted on the central support, which mechanism is operable by an operating rod projecting from the bodyform and which is rotatable about its axis to operate the adjustment mechanism and is axially displaceable to lock said mechanism in its adjusted position. A preferred adjustment mechanism comprises a pair of pushrods which drive opposed pairs of body sections equally and oppositely, these pushrods being engaged with opposite sides of a central cog thus enabling a driving gear on the operating rod to act on one of the pushrods only. The adjustment mechanism is accommodated in a housing which carries fixed teeth in spaced overlapping relationship to the teeth of the pushrod whereby opposite axial movement of the rod engage and disengage the gear from the fixed teeth while such gear remains in engagement with the pushrod.

Abstract: A tape dispenser (1) for a plurality of rolls of pressure sensitive adhesive tape (70) including a tape storage compartment (5) and tape severance compartment (6) in which are located flexible retention wings (40), guard fingers (17) and tape cutter bar (50). Tape is drawn across a flexible retention wing and the cutter bar for severance, following which it is retained on a flexible retention wing and has a free end portion (70a) that can be grasped for subsequent severance of another length of tape.

Abstract: A high speed article feeding apparatus for successively feeding articles in sheet or strip form to a work station for the performance thereon of a shaping or forming operation. A reciprocable shuttle includes a pneumatic feed clamp for clamping the work during a feed stroke and a pneumatic hold clamp for holding the work at the work station. The shuttle is operated by a pneumatic cylinder. A pneumatic circuit includes two interconnected pneumatic values to control the operation and sequencing of the elements of the feeder for fast operation without misfeeds.

Abstract: An apparatus for orienting and placing a button for attachment to a garment, comprising: a support; a guide mounted or said support and having a guide channel for guiding the button therethrough; a pusher slidably mounted in said guide for pushing the button through and out of said guide channel; a clinching die fixed to said support contiguous to one end of said guide for receiving thereon the button having been pushed out of said guide channel; a finger holder axially slidably and rotatably mounted on said clinching die and having at its upper end a pair of fingers for clamping the button on said clinching die, said finger holder having on its periphery a first gear; a second gear carried by said support and meshing with said first gear; a fluid-pressurized cylinder operatively connected with said second gear for turning the latter through a predetermined angle; and means for adjustably regulating the extent to which said second gear is turned.

Abstract: A soldering apparatus is disclosed for attachment to a positioning robot arm. A soldering iron and a supply of solder are combined on an accessory tool and additionally the robot has the capability of periodically cleaning the soldering iron to maintain a high degree of repetitive quality. Additionally the time to accomplish repetitive soldering functions is significantly reduced.

Abstract: Welding apparatus for a vehicle body of a two-wheeled vehicle including a machine base, at least one lower jig carrier mounted on the base for reciprocation between the first position and the second position ahead of the first position, clamping devices for holding a workpiece on the lower jig carrier, a machine frame mounted over the machine base at the second position, an upper jig carrier mounted on the machine frame which is moveable upwardly and downwardly and is reciprocatable between the second position and a third position ahead of the second position, a second set of clamping devices for holding the workpiece on the upper jig carrier, welding devices at the second position for welding certain predetermined points on the workpiece, and structure designed for reversibly changing the orientation of the upper jig carrier while holding the workpiece by 180.degree.. The apparatus further includes equipment at the third position for welding another set of certain predetermined points on the workpiece.

Abstract: Superalloy components which have defects such as pits, machining errors or any other `lack of metal` condition can be repaired using a braze stabilized sinter process. The invention includes filling the defect with a mixture of base super-alloy powder mixed with a low temperature braze alloy. A higher temperature alloy is overlayed and the component subjected to a vacuum furnace cycle that includes a dwell between the melting points of the two braze alloys. This dwell allows the lower temperature alloy to melt and isothermally solidify by the process of diffusion. This effectively `stabilizes` the sinter which is porous. On further heating, the higher temperature braze alloy melts and flows into the interstices of the sinter, forming a pore-free solid mass. The higher temperature braze alloy can also be diffused by holding at elevated temperatures. This increases the remelt temperature of the repair should further thermal cycling be required.

Abstract: In a method of producing heavy plate of steel, a prematerial is hot-rolled in several passes. As the prematerial at least two slabs of the same steel quality are superposed so as to form a pack and are welded by roll-bonding and reduced in thickness.

Abstract: A closure for one end of a carton having four walls has a first pair of opposed flaps extending from two of the walls. Each flap of the first pair of flaps has a generally triangular portion. A second pair of opposed flaps extend from the other two of the walls and are connected to the first pair of flaps for thereby providing an endless series of flaps. One of the flaps of the first pair has a height exceeding the height of the other of the first pair. The flaps of the second pair gradually increase in height whereby folding of the first pair of flaps followed by folding of the second pair of flaps causes the flaps to be disposed below the plane of the carton bottom for thereby being maintained in a snap locking engagement.

Abstract: A cash collection receptacle for receiving coins and paper currency from a farebox is disclosed. The receptacle is comprised of a five-sided steel cashbox with two inner chambers which receive coins and currency separately from the farebox. The cashbox has disposed therein a lock assembly into which a slidable steel cover is engaged by means of a rotatable control handle to lock the cashbox.

Abstract: This automobile thermostat valve system is designed to take the place of the common thermostat, so as to enable an automobile to run efficiently in any part of the world where there are various temperature differences. Primarily, it consists of a temperature sensing plug, an electronic temperature reading gauge, a control switch for setting the gauge to the desired temperature range, and a modified thermostat, which is vacuum operated to control the valve stem, which controls the water flow in the engine block and radiator of the automobile.

Abstract: An improved foundation ventilator assembly including a housing in which united shutter elements are mounted for pivotal movement between an open and closed position to control air flow through the ventilator. Preferably, a thermally responsive spring is secured to one of the shutter elements to cause pivotal movement of same with changes in ambient temperature. The housing defines openings therein for the receipt of mounting means which are utilized to secure the ventilator assembly within a foundation or other wall opening. The mounting means includes a threaded element in threaded engagement with a pressure element, such that when the threaded element is screwed into the foundation or other wall surrounding the opening, force is applied against the ventilator assembly or at least partially absorbed by the pressure plate. A removably secureable rear cover or screen may also be provided to close the rear of the ventilator assembly.

Abstract: An improved method of and apparatus for making artificial snow. The snow making machine disclosed for practicing the invention includes a ducted fan for generating a substantially unidirectional, high volume air current over the area to be deposited with snow. High velocity water sprays are injected into the air current from above and below the air current via a plurality of nozzles connected to a annular water manifold circumferentially disposed around the output end of the fan duct. Nucleated ice crystals are also injected into the air current by a high velocity vapor spray emitted from a pair of seeder nozzles disposed at the center of the annular water manifold. The vapor spray is comprised of a mixture of water and compressed air which is vaporized in a venturi-type expansion chamber prior to emission through the seeder nozzles.