Abstract: A skylight, having a wing actuated by pneumatic springs, can be moved to an emergency opening position thereby substantially exposing the opening area of the skylight case. The skylight also acts as a residential ceiling or attic skylight which has, in the normal open position, a considerably smaller opening than in the emergency open position. A locking device is provided to restrict the long extension stroke of the piston rod of the pneumatic springs to a partial stroke. This partial stroke allows an opening which essentially corresponds to the standard opening of the wing in a residential skylight. The locking device, located on the cylinder of the pneumatic spring, includes a specially designed latch which, in order to effect partial stroke restriction of the piston rod, lockingly engages a stop located on the side of the case by means of a catch pin.

Abstract: The prevent invention is directed to improvements in vending machines of the type having an access door which is opened by a purchaser for removing a purchased article from within the machine.A two-stage hydraulic door closer is provided with a spring to return the access door through its arc of movement from the open to the closed position at a relatively slow, controlled, substantially uniform rate which allows a purchaser to open and release the door and then to remove an article from the interior of the vending machine with one hand without interference by the access door while the article is being removed.

Abstract: A kennel door which pivots about a vertical axis that bisects the door. The door is mounted within an opening in a frame. Disposed along the periphery of the frame are door seals which provide both a stop against which the door comes to rest and a seal against weather coming in through the opening when the door is in a closed position. When the door is in a closed position, the door seals are situated on diametrically opposite sides of the door such that they permit the door to rotate in one direction through the opening but not in the other direction. A spring biases the door in a closed position resting against the door seals.

Abstract: An apparatus for mounting a closure on a housing or the like, the apparatus having two arm members mounting the closure on the housing and each having a camming surface and a guide channel individually engaging a pivot pin and guide pin respectively borne by the housing and mounting the closure for movement between a recessed closed position and a recessed opened position relative to the housing. A confining assembly including a plurality of the housings aligned in a substantially horizontal row and having a single substantially flat panel extending beneath a plurality of the housings to serve as a floor therefor.

Abstract: This invention relates to a novel door apparatus of the type wherein one door rotates while moving horizontally to the righ or left when opened, and finally approaches to the sidewall of an entrance and becomes in parallel therewith. The door apparatus of the invention is particularly suitable for the handicapped or those who use a wheelchair and who have difficulty in passing smoothly through doors in general.

Abstract: A damper device comprises damping structure and a spring device and is advantageously used for a door swingably supported by a shaft to be opened and shut between a totally shut position and a totally opened position and opened under the influence of its own weight at least from a position intermediate of the aforementioned two positions to the totally opened state. The damper element acts against the motion of the door. The spring element biases the door in the shutting direction at least from the intermediate position to the totally opened position.

Abstract: Weight compensation for hinged doors, hatches, gates, or the like, which swing up and down on an upper horizontal hinge axis, comprises a torsion rod extending parallel to the hinge axis and having hollow shafts or bushings at its respective ends, one of the bushings is connected through a lever and a continuously length adjustable rod to the frame and on one side of said door, hatch, or gate, the other bushing is mounted to a lever, and a continuously adjustable tensioning screw fastens that lever to the door, hatch, or gate, and at the other side thereof.

Abstract: A so-called shoe for a glass door embodying a mechanism for making adjustments in the position of pivotal traverse of the door relative to the door opening and also in the lateral position thereof, said pivotal traverse position components of said mechanism including a cam means to selectively load and unload a spring to allow said spring to correspondingly urge said door in opposite directions of pivotal traverse for providing said door with an adjusted position in said door opening.

Abstract: A relatively uncomplicated hinge and spring assembly for effectively counterbalancing the trunk lid of an automotive vehicle and for partially opening that lid when it is unlatched. The assembly utilizes an adjustable tension coil spring that exerts a diminishing lifting force as the lid is raised and that, at the manufacturer's/user's option, is used to counterbalance or slightly exceed the gradually diminishing unsupported weight of the lid as it moves from lowered to raised position. The lifting force is augmented over a limited arc of the lid's travel, by lateral deflection or distortion of the spring, to urge the lid into its partially-raised position when it is unlatched.

Abstract: A gun port assembly includes:(a) an armored closure,(b) structure forming a main port,(c) and a rocker arm pivotably carried by such structure to carry the closure into closing and opening relation to the port in response to pivoting of the arm,(d) and over-center spring mechanism biasing the arm to have a first stable position in which the closure extends in closing relation to the port, and a second stable position in which the closure is spaced away from the port, and the port is open.

Abstract: This disclosure relates to an access door assembly for a ceiling. The assembly includes a frame adapted to be attached to supports of the ceiling and mounted in a generally horizontal position, and a door which fits within and has one edge hingedly connected to the frame. The hinge enables the door to swing between a generally horizontal closed position within the frame and a lowered open position. A constant-force return spring urges the door to the closed position, and an automatically engageable lock is provided for holding the door in the closed position. The frame and the door have closely adjacent Z-shaped frame members and the door is made of heat-resistant material, to form a fire retardant construction.

Abstract: An operator's station mounted on the rear bogie of an articulated tractor and having a door that swings out from a hinge on its rear edge and in which the front bogie may swing relative to the rear bogie so that parts of the tractor on the front bogie may move into the zone of swinging of the door, the improvement residing in the hinge structure and door positioning structure which automatically shifts the door into either its fully opened or fully closed positions and out of the area in which the aforesaid tractor parts may shift. The structure includes means for hinging the door to swing about a vertical axis from its rear edge and a link structure that is connected to a post on the operator's station and which has a rear end connected thereto on a pivot structure that is offset inwardly and rearwardly from the hinge axis of the door. The link structure further includes a portion that extends from its rear and forwardly alongside a face of the door to a front end which is connected to the door.

Abstract: A low clearance door assembly is provided which is suitable for a variety of applications. The assembly includes an easily operated door which has two guide pins extending from each end. Guide members provide slots in which the pins ride. A spring, connected between one of the pins and the adjacent guide member, assists the user in opening and closing the door. In addition, a detent disposed in one of the slots prevents the door from opening as a result of bumping.

Abstract: An improved vending machine having an enclosure for storage of articles and an access door is provided with an arm affixed to the door and which has a free end, with a hydraulic door closer connected between the free end and the machine. A stop element is affixed to the machine enclosure and projects into the door opening of the access door for stopping movement of the arm thereby to limit the opening movement of the door and thus prevent application of excessive force to the hydraulic door closer. The vending machine also includes a latch hook releasably engageable with the stop element for restraining the door in an open position against return to a closed position.

Abstract: A reversible hinge for use on a freezer compartment door of a single door refrigerator includes a stationary leaf for mounting to the refrigerator cabinet and a movable leaf for mounting to the freezer compartment door, as well as a tension spring extending therebetween to provide bias toward either an open position or a closed position. The spring is connected between a first pair of tabs when the hinge is mounted for left-hand opening of the freezer compartment door and between a second pair of tabs when the hinge is mounted for right-hand opening of the freezer compartment door.

Abstract: A wall panel for a building may be formed by twin sheet vacuum form molding an entire end panel which may then be cut to form an access opening which may be closed with the removed portion forming the door with the cut panel reassembled to form the building wall and door frame. A novel closure and lock secures the door.

Abstract: A mechanism for opening and closing a lid is disclosed, which includes a rotary damper and an auxiliary rotary damper. An input gear of the rotary damper is in mesh with an output gear of a lid. An input gear of the auxiliary rotary damper is in mesh with the output gear of the lid or the input gear of the rotary damper. Thus, the lid can be sufficiently braked during the opening and closing operations.

Abstract: A counterbalancing device for a hatchback lid on a road vehicle includes a lid hinged at the top about a horizontal axis to the superstructure of the vehicle and at least one counterbalancing unit such as a pneumatic spring. One end of the counterbalancing unit is pivoted to the superstructure and the other end is pivoted to the lid. The counterbalancing unit is pivotally connected to one of the lid and the superstructure by a first lever. A first end of a link is pivotally connected to the first lever; a second end of the link is pivotally connected to a second lever which, in turn, is connected to the one of the superstructure and the lid. A roller carried by the second lever bears against the superstructure or the lid near the closed position of the lid. The device is more efficient than known devices irrespective of the layout of the lid.

Abstract: A window to be used as a skylight or a front window and comprising a frame (1) and two window wings (2, 3) situated above one another on the outside of said frame and being pivotably openable about mutually parallel, especially horizontal axes (17, 18), and which in their open positions can be situated closely below one another in the upper opening of the frame. The two window wings (2, 3) are mutually separated and separately movable and are positioned completely outside the frame (1) both in their closed as well as in their open positions.In this manner a window is obtained which is inexpensive to manufacture and which allows many adjustment possibilities including a completely open position with a clear view and a great emergency exit, and where the loads on each wing are relatively insignificant.

Abstract: A fully assembled hinge mechanism for a door of a major appliance which comprises an elongated guide member arranged to be attached to the appliance at spaced apart front edges thereof having a pivotal door hanger lever extending therefrom, and a hinge arm pivotally connected to the door hanger lever and movable on the guide member to permit opening of a door on the hanger lever where the hinge arm is spring biased into contact with the guide member and the spring counterbalances the weight of the door.

Abstract: A hinged driveway gate opened manually or by a vehicle against a closing force is latched in the open position for an adjustable time interval for vehicle passage by the control mechanism having an improved support connection with the gate, an improved latch mechanism, a novel optional power spring, an improved dashpot and a novel protective cover.

Abstract: A door includes a pair of pivot pins each positioned on the outer surface of a respective, facing edge-mounted resilient flange. Each resilient flange is adapted for flexible displacement relative to facing lateral portions of a support panel in which the door is to be mounted, while each pivot pin is adapted for insertion within a respective mounting aperture in each of said support panel facing portions. Each support panel facing portion is provided with a ramp positioned adjacent to a respective mounting aperture, with the taper of the ramps providing decreasing inter-ramp spacing in the direction of pivoting displacement of the door as it is opened. Positioned adjacent to each of the pivot pins on the outer lateral surface of each resilient flange and arranged so as to engage a corresponding ramp is a cam having a first beveled and a second flat outer surface.

Abstract: A door fitting device capable of adjusting an axis of rotation and torque, which makes it possible to connect easily a torsion bar and a worm wheel and to engage the worm wheel with a worm. The door fitting device itself can be assembled easily and rapidly in parallel with fitting of the door to an upper and lower frame.

Abstract: A door for refrigerating and freezing chambers, comprising a door frame supporting one or more glass panes for exposing refrigerated or frozen goods in said chamber through the door. According to the invention, the door frame comprises a section (6) capable to support the glass (4) associated with the door (1) along only one vertical edge (7) of the glass (4), at which edge (7) the door (1) is intended to be hingedly suspended in a door case. An inner longitudinal cavity (10) is located along the entire length of the section (6), in which cavity (10) a torsion spring (11) extends substantially along the entire length of the section (6), which torsion spring (11) is capable to be locked at one end relative to the section (6) and at its other end relative to said door case.

Abstract: Mechanism for controlling the opening and closing of an appliance door or panel uses mechanical coupling members including a crank pivoted about an axis parallel to the axis on which the door or panel is hinged. The crank is connected to one end of a tension helical spring, while the other end of the spring is connected to a fixed anchor point. The crank is also connected to the door panel by means of a link. The spring undergoes a first phase of expansion with initial opening of the door. A deflective post is provided proximate to the spring which bends the spring and results in a second phase of more rapid spring expansion with further opening of the door for compensating for the increased torques acting on the door.

Abstract: A sun roof for a vehicle has an opening therein closed by a cover plate. The cover plate is pivotally attached to the roof at the front edge thereof. The rear edge of the cover is adapted to move vertically relative to the plane of the roof. An adjusting device is provided for moving the rear edge of the cover plate. The adjusting device includes a spring for applying a spring force to the rear edge of the cover plate to move the rear edge thereof vertically. The adjusting device further includes flexible pulling means acting against the spring force and connected to the cover plate at one end thereof and driving means for driving the other end of the flexible pulling means to provide for opening or closing of the roof opening.

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 compact, spring actuated, counterbalance system (10) for relatively large, inwardly opening aircraft bulk cargo doors (11) and similar closures of the type adapted to be pivoted about a horizontal hinge axis (12) oriented along the upper edge of the door (11) which is of the type commonly shifted through angles on the order of about 50.degree. between fully closed and fully opened positions and employing: (i) an overhead conventional type compression spring assembly (15) including a housing (20), a spring actuator (21) movable axially through the housing (20), and an axially compressible spring assembly (19.sub.a -19.sub.d) bottomed at one end on the housing (20) and at its opposite end on the spring actuator (21); (ii) a bell crank assembly (16) having a bell crank (24) pivotally mounted on the overhead aircraft structural frame (18) and having a pair of angularly related crank arms (24.sub.a, 24.sub.

Abstract: The disclosed spring mechanism is useful, for example, as a counterbalance or as a spring suspension. The preferred form of mechanism has opposite output parts for connection to the external apparatus. One output part is fixed to two side-by-side torsion-spring columns--two bundles of rods--and the side-by-side opposite ends of the columns bear diametrically opposite cam followers. The second output part is unified with complementary cam tracks for the cam followers of both columns. The spring mechanism has varied characteristics, depending on the shapes of the cam tracks.

Abstract: A counterbalancing system (30) for an inwardly/outwardly moving door (20) pivotable about an inclined hinge axis between fully closed and fully opened positions wherein the door (20) moves: (i) upslope through angle .beta. and downslope through angle .theta. as it opens; and (ii), upslope through angle .theta. and downslope through angle .beta. as it closes. The door (20) is hinged to a torque tube assembly (25) coincident with the hinge axis; a radial cam (38) having a profiled cam face (36) is mounted on the torque tube assembly (25) for rotation through the angles .beta. and .theta.; and, springs (31, 32) are mounted within a housing (34) having a reciprocable piston (44) and a cam follower (35) carried thereby for biasing the follower (35) into engagement with the cam face (36). As door (20) moves downwardly through angles .beta. and .theta., the springs (31, 32) are compressed and energy is stored therein. As door (20) is manually shifted upslope through angles .beta. and .theta.

Abstract: A door is pivotally mounted to a support panel by means of right and left outwardly directed mounting studs positioned on the support panel which are adapted for insertion within a respective aperture in a lateral portion of the door. The door is free to pivot about the mounting studs in a vertical direction and includes a pair of tabs extending from a lower portion of the door toward the panel. Each tab is aligned with a respective resilient biasing arm extending from the panel toward the door. Each door tab is engaged by a respective biasing arm when the door is moved toward the closed position so as to urge the door to the full closed position in which it is maintained by the biasing arms. When the door is opened by rotating it about an axis aligned with the mounting studs, the tabs are displaced from engagement with the biasing arms and the door is free to assume the full open position wherein it is maintained in a generally horizontal orientation by rotations stops.

Abstract: An improved closure panel hinge assembly is provided that gives an improved opening motion to a closure panel, such as a deck lid that has an edge disposed close to a vertical plane associated with the vehicle, such as the plane of a backlite. A pair of horizontal guide tracks and sliding pivots cooperate with an interconnected hinge strap, control link and follower link to shift the edge of the deck lid away from the back light as it is initially raised. Continued raising of the deck lid tilts it upwardly to an open position.

Abstract: A coin operated pull down door mechanism for a vending machine is disclosed having a latch mounted to the door above a coin receiving and sorting mechanism, a coin seat disposed underneath the coin mechanism, a rod mounted for normally yielding to a camming surface on the door latch when an attempt is made to open the door, and a lever cooperating with coinage wedged by the coin mechanism against the coin seat so as to urge the rod into engagement with the camming surface to thereby bias the latch out of locking engagement with the keeper, allowing opening of the door. Also disclosed is a door return spring mechanism for a vending machine.

Abstract: A media protection system 10 uses a media storage box 20 arranged within a fire resistant safe 11 so that the media box door 25 and the safe door 12 cooperate to seal media box 20 closed and hold it spaced from interior walls of safe 11. Media box door 25 has a roller 30 arranged on a pivot axis 26 spaced forward and below its hinge axis 24 at the lower front of media box 20. The weight of media box 20 and its door 25 resting on door roller 30, which can roll along a horizontal surface of the interior 14 of safe 11, automatically biases safe door 12 to either a fully closed position or a fully open position. An abutment 35 on the inside of safe door 12 presses media box door 25 fully closed and sealed.

Abstract: A side panel which is openably and closably mounted on a bed of a load carrying vehicle includes a pipe in which a compression coil spring is disposed with its one end secured to the pipe. The other end of the compression coil spring is connected to a guide plate movable through a slot in the pipe and pivotably coupled to a link pivotably connected to a frame mounted on the bed. The side panel can be angularly moved between the open and closed positions with a small manual force with the aid of the resiliency of the compression coil spring. The secured end of the compression coil spring is positionally adjustable within the pipe so that the resilient force of the compression coil spring can be varied. The compression coil spring is held in frictional engagement with the pipe to allow the side panel to be brought to a stop at any desired position between the open and closed positions.

Abstract: A sealing cover for an attic floor well opening and attic stairs is provided and consists of a dome made of insulated material, a seal made of weather stripping mounted around bottom edge of the dome, a device for holding down the dome over the attic floor well opening and compressing the seal around perimeter of the attic floor well opening making the dome draft free and another device for raising up the dome from the attic floor well opening so that a person may gain access through the attic floor well opening via the attic stairs.

Abstract: A stretchable tube-like sleeve surrounds and frictionally grips an inner rod or tube. A coil spring surrounds the sleeve in position to resist movement of one end of the sleeve against the spring force. Moving the rod axially relative to the spring in a direction against the spring force on the sleeve decreases the inner diameter of the sleeve to produce a drag on the inner member. Movement of the opposite end of the sleeve is limited by a stop. This causes the sleeve to expand and allows the rod to slip with a constant drag which is determined by the strength of the spring. With the spring force in position to be applied to only one end of the sleeve, movement of the inner member in the opposite direction provides only a minimal drag as determined by the initial frictional interference between the sleeve and the inner member. Positioning the spring to resist movement of either end of the sleeve, provides a constant drag on the inner member with either direction of movement of the rod relative to the sleeve.

Abstract: A rectangular frame set into the concrete surround at the head of a shaft supports one or more slab doors that are hinged to the frame. Adjacent each hinge line brackets fixed to the frame support a fixed spindle upon which a helical spring is secured. The spring has an extending limb at one end that bears against the under surface of the door. The other end of the spring is engaged with a winding bushing rotatable on the fixed spindle, and the bushing has a hollow hub for accepting a detachable winder so that the spring may be pretorqued to the proper loading to raise the door from its horizontal closed position to a substantially vertical attitude for access to the shaft or other opening.The frame defines a drip trough to collect moisture passing the door edges and when two doors are used a channel extending along the butt line of the doors collects water passing between the adjacent edges of the doors.

Abstract: A pivoting gate (10) is disclosed which has a rectangular gate frame (11) which is rotated about a horizontal axis by a gate operator (12) from a horizontal closed position to a vertical open position. The torque about the pivot axis is counterbalanced by an opening tension spring (28) when the center of gravity of the gate frame (11) is over the closed position of the gate, and is counterbalanced by one or more closing tension springs (22) when the center of gravity is past the pivot axis and is over the open position of the gate. The closing tension springs (22) are connected to the gate frame at one end and are so attached to the gate operator at their other ends that they will slide freely while the gate is opening but will be held to stretch and apply a counterbalancing torque to the gate frame when its center of gravity is past the pivot axis.

Abstract: A compact, spring operated, two-way counterbalance system is disclosed for the hinge assembly of an inwardly/outwardly moveable plug-type aircraft passenger door of the type adapted to pivot about an inwardly canted hinge axis whereby a first convolute clock-type spring member is wound during the final stages of downward door-closing movement to provide an outward biasing force for assisting on-board flight attendants in opening the door during that portion of door movement when it must move in an upward direction; and, a second convolute clock-type spring member is provided which is wound during the latter stages of door opening movement when the door is moving in a downward direction, with the second convolute spring member thus providing a biasing force for assisting the on-board flight attendant in pulling the door upwardly and away from the fuselage during upslope door-closing movement.

Abstract: A five sided steel box with a honeycomb member therein formed by corrugated sheets and defining a plurality of hexagonal elongate recesses. Spacers on the outer faces of the walls of the box have tie bars secured transversely thereto and the ends of the bars are welded to protective hoops. A door closes and seals the box and comprises a framework, a panel mounted on the framework by means of clamping screws or parallelogram linkage and coil springs, and a seal between the panel and the open side of the box. The framework is preferably hinged to protective hoops of the box at one side and provided with a latch arrangement at the other.

Abstract: A simple, compact, cantilever-type spring (31) is mounted on the aircraft body structure (22) and is positioned so as to be deflected from its normally unstressed condition to a stressed state (31') by means of a radially projecting roller (39) mounted on and carried by the body-mounted torque tube (35) during at least the final increment of movement of the aircraft door (20) when it is being shifted to its fully opened position so as to store energy in the spring (31) for assisting in closing of the door (20) and counterbalancing the hinge moment attributable to the weight of the door (20) when the door is moving upslope during a door closing operation and for thereby minimizing the exertion of the on-board flight attendant (29) who is required to apply torque manually by pulling upwardly and outwardly thereon to overcome the door hinge moment until such time that the door (20) begins its downslope travel about the canted hinge axis (35).

Abstract: A first gear is fixedly connected to the rotary shaft of a swingably mounted lid, and is engaged with a second gear which is rotatably mounted on a stationary member. The second gear is biased by means of a spring in such a direction that the lid tends to swing open, while a ratchet portion having a recess is provided at a peripheral portion thereof. A pawl is arranged to engage with the recess to stop the rotation of the second gear, and is arranged to disengage with the recess to release the second gear when intended to open the lid. A brake member is interposed between the stationary member and the second gear to prevent the lid from rapid opening. The pawl may be manually disengaged from the recess by depressing a push-button operatively connected thereto. Such a push-button may be omitted if the shape of the recess is arranged to easily disengage from the pawl when the lid is pulled manually.

Abstract: A gate assembly including a support portion and a gate portion carried by the support portion and movable with respect thereto, a gate control portion and a gate activating portion associated with the gate portion; the gate portion having one end thereof disposed adjacent to the support portion and extending outwardly therefrom, pivot mechanism connecting a lower part of the gate portion to an adjacent lower part of the support portion; the gate control portion including biasing mechanism associated with the gate portion; the gate activating portion including a power source mounted within the frame members of the support portion adjacent one end thereof, drive mechanism including translatable mechanism activatable by the power source, the translatable mechanism including a pair of transversely spaced roller assemblies slidably carried on spaced horizontal rail members, the drive mechanism also including continuous flexible loop mechanism supported adjacent the ends of each rail member, each roller assembly be

Abstract: A balancing device consists of at least one balancer, for example a pneumatic jack, one end of which is connected to the deck lid by a swivel joint and whose other end is hinged to the vehicle body. The balancer is hinged to the vehicle body through a bent return lever consisting of two unequal arms and is attached at its bend to the vehicle body about an axis parallel to the hinge axis of the hatchback. The end of the arm oriented toward the axis forms a hinge for the said other end of the balancer while the end of the other arm of the bent lever is in contact with the concave cam surface of a cam attached to the deck lid.

Abstract: A compact, cam operated, counterbalance system (30) is provided for the torque tube assembly (25) associated with a moveable hinged structural member (20) of the type hingedly connected to a fixed structural member and adapted to pivot about an inclined hinge axis in which the counterbalance system includes: (i) a cylindrical cam (31) surrounding a torque tube (38) and defining an axially presented continuous cylindrical cam surface (32) formed by a plurality of axially presented curved ramps (32a, 32b); (ii) cam follower means (34, 35, 36) mounted concentrically about the torque tube (38); (iii) a compression spring (42) mounted concentrically about the torque tube (38) for continuously biasing one of the cylindrical cam (31) or the cam follower means (34, 35, 36) axially towards the other; (iv) one of the cylindrical cam (31) and the cam follower means (34, 35, 36) being rigidly mounted on the fixed structural member (22); (v) the other of the cylindrical cam (31) and the cam follower means (34, 35, 36) bei

Abstract: Magnetic door hardware for closing swinging doors. Two magnets are axially aligned with the door post, and the magnetic fields of the magnets are aligned so as to produce a radial torque when the door is swung open. One magnet is attached to the door post, and the other magnet is attached to the door frame so that the radial torque produced by the magnets causes the door to rotate to the closed position.

Abstract: A door-operating mechanism is disclosed which is particularly suited for use with hingedly mounted swinging glass doors of a refrigerated display cabinet. The door operating mechanism includes an extensible gas spring biased toward an extended condition, and a linkage arrangement operatively interconnecting the gas spring with the door. A portion of the gas spring is movably disposed within a slot defined by the linkage arrangement such that in one position of the gas spring the door is biased toward its closed position, and in another position of the gas spring the door may be maintained in an opened position such as for stocking or maintenance of the display cabinet.

Abstract: In a window, especially for installation in an inclined roof, a secondary frame element or sash is connected with the stationary main frame of the window in a top hinge and is urged in its opening direction by a lifting lever hinged at its one end through a pivot pin to a side member of the secondary frame element or the main frame, while its other end is pivotally and displaceably connected with the adjacent member of the main frame or the secondary frame element, respectively, said lever being biassed by a spring tending to displace said other end in a direction corresponding to opening the window.The said other end of the lever is provided with several pins which during the opening or closing movement of the window successively become operative as the pivot point, thereby giving the lever a varying effective length, whereby the curve of the spring balancing moment performed on the frame element may be optimized and, if desired, a series of stable positions of rest for the tilting frame may be obtained.

Abstract: In a window assembly including a panel mounted for pivotal movement relative to a casing in a roof sheathing, a moving rib attached to the panel and a guide rib operatively connected to the moving rib, actuating means for automatically pivoting the panel from a closed position overlying the casing to an open position disposed at a predetermined angle to the casing comprising a preloaded spring member, at least one actuating lever connected to said spring member, said actuating lever pivotally connected at its ends to the casing and guide rib and operable upon release of the panel from a closed position to effect pivotal movement of the panel to a predetermined angular position relative to the casing for a given linear displacement of said spring member and adjusting means for selectively varying the angular displacement of said panel by said actuating means.