Abstract: A door having a door core construction having a front face and a rear face which are both planar, and at least one window opening formed in said front and rear faces, both the front face and the rear face being entirely covered by a transparent covering layer.In an alternative embodiment the door construction may comprise a door core having at least one aperture extending between a front and rear surface of the door core, the aperture being closed by a pair of panes, one pane being mounted so as to have an outer surface contiguous with the front surface of the door core and the other pane being mounted so as to have an outer surface contiguous with the rear surface of the door core, a front and rear surface covering layer covering the front and rear surfaces respectively of the core and having an aperture of smaller dimensions than the pane mounted in the surface covered thereby so that the peripheral margin of said pane is also covered by said covering layer.

Abstract: A vision panel assembly for a fire door includes a frame structure and a glass vision panel which are mounted in a rectangular opening in the fire door. The frame structure includes a pair of frames which are anchored in grooves in the fire door and which are clamped against the glass vision panel. One frame is provided with fastener bars which are threadedly engaged by fastening screws for securing the frames together. Panel support elements extend through openings in the fastener bars for engaging edges of the glass vision panel to provide support therefor.

Abstract: A service hatch insertable in doors and walls, with a frame insertable in an opening of a door or of a wall and a closing part connected to said frame and incorporating a service opening, whereby the closing part has a shock-proof, transparent panel, a fixing slot for fixing one edge of this panel and, on the opposite edge of the panel, a hinged handle which can be turned around a turning axle parallel to the two edges. The handle bears a support rod at a distance from the turning axle, on which support rod the neighboring edge of the panel rests.

Abstract: The present invention relates to a shutter which is capable of ventilating air in a building. There is provided a slat, which has a through-hole covered with a net, in the upper section of the shutter; there is provided a slat, which is capable of adjusting the amount of ventilating air, in the lower section of the shutter. With this combination, fresh air is able to enter the building from the lower slat and air inside is able to flow out from the upper slat when the lower slat makes possible to ventilate.

Abstract: A heat insulating cover for an upwardly open cooling container, especially deep cooling container, having a cooling chamber, the heat insulating cover comprises a plurality of cover plates arranged to abut against one another to cover the cooling chamber and to be placed on an upper edge of the cooling container, and elements forming in the cover passages for communicating one side of the cover facing toward the cooling chamber with another side of the cover facing toward a surrounding atmosphere.

Abstract: An entry door system constructed of panels having a metal skin filled with insulating rigid foam core and having a unique wood facing and whereby the system has exceptional insulating qualities while projecting the beauty of a wood door. The system includes door and side panel components of substantially the same construction, except for the size, and provides for a versatile arrangement of panel components which in different selected combinations can be secured together into a single unit ready to be installed. The wood facing of the core filled panels includes wood stile and rail facing pieces and one or more raised panel subassemblies comprising a base panel to which is secured a raised panel with decorative wooden beads located at their perimeters which creates a wood picture frame look on the outer surfaces of the panels.

Abstract: A storm door comprising a frame assembly which includes tubular metal frame members, each of the frame members having a uniform rectangular cross-sectional shape and being formed into a continuous unibody frame. The frame being rectangular in shape and including at least one opening therein. The storm door also including window and/or kick plate assemblies which include a flange member which allows the assembly to be easily inserted into the opening in the frame and attached thereto.

Abstract: The invention is directed to a lock system for permitting objects to be ped from a contaminated chamber into a container which is disposed in a contamination-free chamber and docked to the lock system. The lock system of the invention includes a displaceable insert mounted on a partition wall separating the chambers. The insert is in the form of a round disc rotatable about its center point. The disc includes lock openings having different cross sections which are arranged on a circle concentric to the center of the disc. The lock system of the invention permits objects of different shape and size to be passed through the lock along only one removal path.

Abstract: A vacuum drier apparatus capable of preventing the thermal deformation of the protection member as well as scattering of the tempered glass plate in a case of an accidental breaking of the tempered glass plate. The apparatus includes elastic supporter members located between the glass plate and the protection member, for supporting the glass plate and the protection member with respect to each other, such that the glass plate can be pressed tightly to seal off the opening section of the vacuum drying space, while the protection member can be pushed away from an edge of the front side of the opening window by an external pressure exerting on the protection member. The protection member is preferably a transparent plastic plate in an outwardly curving dome-shaped form.

Abstract: An improve microtomy device is disclosed comprising a microtome and a thermostatically controlled refrigeration means controllable by a microprocessor and accommodated in an instrument cabinet, the improvement comprising, providing an upper part of the instrument cabinet in the form of a movable cover, which cover encloses a slidable transparent pane arranged above the microtome to define an inspection window disposed in a front portion of the cover. The pane is heatable and can be removed from the cover and/or shifted into a rearward portion of the cover to open the inspection window for cleaning purposes. The improved device provides convenient accessibility to the interior of the instrument and improved control of operations.

Abstract: A portlight for installing at an opening in a wall of a boat, comprising an interior frame surrounding an open viewing area. The interior frame comprises an axially extending spigot for outward insertion in an opening in a wall of a boat and an interior flange extending radially outward from the spigot to overlap the interior face of the wall of the boat. An exterior frame surrounds an open viewing area. Plural fasteners fixedly clamp, between the interior flange and exterior flange, the rim of the opening in the wall of the boat. A pair of widely-spaced holes through the interior flange receive screw means for biting into the adjacent wall of the boat and thereby temporarily fix the interior flange on the wall of the boat to allow a single installer to place the exterior flange and install the plural fastener means and thereby clamp the exterior flange and interior flange on the rim of the opening in the wall of the boat.

Abstract: The present invention provides a viewing device, said device being positioned within the outer and inner surfaces of an entry door, to ascertain the identity of prospective entrants from within the confines of a dewlling. The device includes on the outer surface of the door a turret wherein at least four ports retain a like series of wide angles lenses. One of said ports and its lens is situated axially along a line from the eyepiece for straight ahead viewing, while the three ports and complimentary lenses are situated radially at right angles in relation to said axial port so as to give complete views of the area below and to the right and left of the doorway. A mirror, being positioned by a cam means, transmits the light and hence the image from each port to the user within the dwelling. By repositioning the mirror, the user may ascertain the presence and identity of visitors within a complete one hundred eighty degree field before the door.

Abstract: A security door comprises an outer frame for closing off a doorway and door hinge means connected to the outer frame for hingedly mounting the outer frame in the doorway. An opening is provided through the outer frame and a plurality of security bars are mounted on the outer frame and extend across the opening. A closure member for closing off the opening is provided, closure member hinge means being connected to the closure member whereby the closure member is pivotally mounted on the outer frame. An insert is provided by the closure member, which insert projects into the opening in the outer frame and occupies said opening when the closure member is in its closed condition, the insert having a plurality of recesses in the form of elongate grooves for respectively receiving the security bars when the closure member is in its closed condition with the bars at least partially enclosed and concealed therein.

Abstract: An improved through-door viewing device comprising a generally rectangular telescope, a lens mounted in one end of said telescope, an eyepiece mounted in the opposite end of said telescope, a window formed in one side of said telescope adjacent said one end, an escutcheon mounting said telescope in a door for sliding and rotating motion within said escutcheon, a mirror mounted within said telescope and pivotable between a first retracted position lying substantially parallel to the wall of said telescope out of the line of vision through said telescope and a second extended position lying across said line of vision in position to direct vision from said eyepiece through said window of said telescope, flange means responsive to inward sliding of said telescope to move said mirror to said retracted position, and spring means responsive to sliding of said telescope outwardly to urge said mirror to said extended position.

Abstract: A window tray assembly comprising a vertical wall having a window therein, a lower margin of the window being defined by a sill, and a planar tray member adapted to be moved from a position parallel to the wall and removed from the window to a position in the window overlying and resting upon the sill, to provide a horizontal tray surface on the window sill.

Abstract: A window for a segmented edifice utilizing three frames, each having a plurality of openings through the same. The first two frames sandwiched the segmented edifice and are held in such configuration by a multiplicity of fasteners. A third frame having a cross member such as a screen is then fastened to the second frame to create a secure window.

Abstract: A prefabricated door light unit comprises a rectangular ringlike frame units which project into the window opening from opposites thereof and are fixably mountable therein. The frame units define a window opening therethrough and have cooperating means for permitting the units to slidably telescope for accommodating the variable thickness of the door. The outer frame unit includes a tubular support wall structure integrally fixed to a peripheral flange wall and projecting substantially transversely therefrom into the door opening. The support wall structure includes a peripheral extension section extending away from a S-shaped cross section in a direction toward the inner frame unit. A window pane or door structure is hingedly connected to swing between open and closed positions with respect to the window opening adjacent one side of the peripheral extension section.

Abstract: A viewing and oral communications assembly for doors generally rectangular in shape, having mirror surfaces to transmit images from positions adjacent to the door through the assembly and having audio communication slots which are closed by expansion of intumescent material in the presence of heat.

Abstract: A viewing port for doors such as residences including a light polarizing assembly including at least two linear polarized optical elements, one mounted for rotation with respect to the other element(s) to change the viewing port from light passing to light blocking or reduced transmission condition. The light polarizing assembly is located at the inner side of the door and is surrounded by a tapered portion of its mounting toward the outer face to provide undistorted wide angle viewing of the area surrounding the door. In another embodiment of this invention, my viewing port is designed to be integrated into a stained glass window.

Abstract: A door with shutter device, having a door panel provided with a plurality of through holes, and a shutter panel moveably disposed to overlap the door panel, the shutter panel having a plurality of through holes of the same size, configuration and arrangement as the through holes of the door panel. The shutter panel is urged by a spring to remain at a closed position where the through holes of the shutter panel are out of alignment with the through holes of the door panel. Operating means is provided to selectively move the shutter panel from the closed position to an open position where the through holes of the shutter panel are aligned with the through holes of the door panel so that one can see the object or person at the otherside of the door without opening the door, through the through holes.

Abstract: In combination with a building door, there is provided a key safe for a door key comprising an open ended housing secured within and projecting through the door. A safe door is hinged to and closes one end of the housing and has a retractable latch bar engageable with the building door to lock the safe door. A combination lock on the safe door includes a normally open printed circuit connected to a power source. A solenoid is connected to the circuit and includes a plunger connected to the latch bar. A tamper proof key tray is nested within the housing and normally spring biased for ejection inwardly of the building door. A first detent assembly is interposed between the safe door and tray so that any forceful opening of the safe door disengages the detent assembly.

Abstract: A solid door for a dwelling, the door combining the features of security, ventilation and insect protection.The door has an aperture covered by a security grill and an insect screen.A sliding panel is fitted to the side of the door facing the interior of the dwelling so that the panel can close the aperture, or be opened to allow ventilation while still maintaining security and the exclusion of insects from the building.

Abstract: A vandal-resistant security view port for use in prison cells and the like. The view port permits observation into a cell or room and is mounted on a frame which can be attached over an opening in a wall of the cell. The view port has a transparent pane and a grate and may be open or covered by a hinged door operable from the back side of the wall.

Abstract: The device consists of an inspection glass (3) inserted in the door (1), a semi-transparent mirror (5) which is arranged inclined behind the inspection glass (3) and which faces the inspection glass (3) with the semi-reflecting side (6), and an optical receiver (7) which is located in the axis of reflection of the mirror (5).The invention is used in the building industry.

Abstract: A door light having exterior and interior rectangular frames which are inserted into the door opening from opposite sides thereof. The exterior frame is molded of a plastics material as an integral, one-piece element having a rearwardly projecting tubular portion which slidably telescopes into a tubular portion defined by the interior frame. The interior and exterior frames slidably telescope until the flanges thereof abut the respective door faces to accommodate variable door widths. The exterior frame has a downwardly and forwardly sloped upper surface along the lower horizontal frame element which, in cooperation with an integral rear wall located behind the inner sash, causes all drainage along the sloped upper surface. Guide tracks are secured along the vertical sides of the frame and define outer and inner channels, with a top sash being stationarily fixed within the upper end of the outer channel.

Abstract: Improved crack propagation resistant acrylic sheets are provided: These sheets are prepared by copolymerizing methyl methacrylate with minor amounts of lower alkyl (C.sub.2 -C.sub.4) methacrylates. One and one quarter inch thick sheets polymerized from a monomer mixture of about 88 weight percent methyl methacrylate and about 12 weight percent butyl methacrylate or from about 76 weight percent methyl methacrylate and about 24 weight percent ethyl methacrylate are useful as indoor and outdoor ballistic glazing materials.

Abstract: An improved tamper-proof window unit comprising similar first and second quadrilateral centrally open frame members adapted to be mounted about an opening respectively on opposite sides of a door. Each frame member has a narrow elongated quadrilateral front panel extending generally in a plane parallel to the door and marginally about the door opening with an outer edge portion partially overlapping the door adjacent the opening. A small countersunk front-to-rear screw hole is provided on each side of the front panel to communicate with the door opening. A narrow elongated quadrilateral and generally L-shaped integral flange extends along the front panel with each L-shaped flange comprising first and second panels. The first panel of each flange projects generally rearwardly and the second panel projects from the rear edge of the first panel outwardly with respect to the door opening.

Abstract: A safety shield for protecting observers from flying debris resulting from a failure of a vacuum or pressure chamber viewing port following an implosion or explosion includes an optically clear shatter-resistant safety shield member spaced apart from the viewing port on the outer surface of the chamber.

Abstract: A door light assembly in which a door light and interior and exterior molding members are secured in a door by an improved security clip. The clip is formed from a single piece of spring steel sheet metal and is adapted to be attached to the exterior molding member by means of a screw. Portions of the clip engage the adjacent edges of the door light and the door to hold the door light in place in the door, while other portions of the clip provide an attachment for the interior molding member. The resulting construction provides greater security since the exterior molding member is locked positively in place by means of screws, while at the same time the construction is aesthetically pleasing in that the screw heads are concealed.

Abstract: A magnetically actuated pet door is disclosed which allows only the owner's pet, such as a cat or dog, to enter. The door is hinged at the top to open in both directions for ingress and egress, but is prevented from opening in the ingress direction by a solenoid-actuated, one-way latch comprised of a plunger against the inside of a flap that is in turn hinged on the inside of the pet door, and held flat against the pet door by springs. A notch in the pet door behind the flap permits the door to swing freely open in the egress direction without the solenoid being energized to withdraw the plunger. A permanent magnet attached to the collar of a pet induces a signal in magnetosensitive devices disposed on the outside of the pet door. That signal is processed to energize the latch solenoid and thereby withdrawing the solenoid plunger from the path of the flap on the pet door to allow the pet to ingress.

Abstract: The improved burglar-resistant door assembly of the invention comprises a door frame, a door hingedly connected to one side of said frame, door latch means connected to the inside surface of said door, a peephole device extending through said door and a protective cover device releasably disposed over the peephole device and/or latch means to prevent tampering therewith. The cover device may comprise a suction cup or pivotally mounted cover plate over the peephole or a screw cover on a threaded track around the peephole, or latch means, or an elastic cover stretched over and gripping the latch means. The latch means may be, for example, a door knob, dead bolt knob or the like. In one embodiment of the cover device, a spaced pair of parallel tracks are mounted on said door inner surface on opposite sides of said latch means and run from about the edge of the door containing the latch means to a location past the latch means and towards the opposite hinge-bearing edge of said door.

Abstract: An air relief mechanism for use in an opening in a storm door disposed in hinged relationship in the outer side of a casing around a door opening containing an inner door disposed in hinged relationship within the casing. An inner frame is secured to the inside surface of the storm door and engages the periphery of said opening. A screen is disposed in said frame and fills said opening. An outer frame is secured to the outside surface of the storm door and engages said opening, said frame having a slot disposed outside the storm door.

Abstract: A panel for securing in a conventional sliding door opening to cooperate with the sliding doors therein has a swinging door flap at the bottom of a panel defined by vertical stiles which may be trimmed to suit varying door frame heights. The stiles bear fixed projections to fit horizontal apertures at the door stile and sliding projections to fit apertures in sill and top rail of the frame. The panel has an adjustable rail which overlaps the weather pane of the panel at top or bottom of the pane. The access door flaps swings from an intermediate rail which may be a part of a panel or a part of a sub-assembly mountable in any opening. The flap has imbedded magnets to arrest it closed and thin wiper edges to seal against weather, and is self-hinging in the intermediate rail.

Abstract: A door light fastener for releasably mounting opposing sections of a door light frame in a door, wherein a plurality of pairs of opposed cylindrical bosses extend inwardly from each of the opposing door light sections, comprises a tubular spring clip that encircles and resiliently holds each pair of bosses together. Inclined barbs in the spring clips permit bosses to be inserted into the ends of the spring clips but inhibit removal of the bosses from the spring clips. A stop projection in each spring clip prevents the bosses from being inserted more than halfway through the spring clip.

Abstract: This invention relates to a closable counter device for a vertical wall structure such as a door of a house or an office or room in a building and more particularly to a closable counter device on a vertical wall such as a door adapted to conveniently communicate with a visitor or visitors or to deliver an article or articles therethrough in the condition of opening the counter device while the door is latched without imparting any discomfort to the visitor or visitors and in a safe manner in connection with prevention of crimes as well as in connection with prevention of privacy.

Abstract: Apparatus for assisting the opening of a door when the door is subjected to added air pressure tending to hold the door closed, the door being provided with openings therethrough and including means for closing the openings but which will operate to remove the closure upon operation of means for unlatching the door.