Abstract: A window guard is provided for a window which may be removably mounted in a window frame to protect the window from storms. The window includes a window frame having frame members, two of which have holes formed on inwardly facing surfaces. The window guard includes a board sized to fit within the window frame and a brace or mounting mechanism pivotally mounted on the board which cooperates with the window frame holes to mount the window guard in the frame. The mounting mechanism includes a cross-member pivotally secured to the board and rods telescopingly received in the cross-member. The cross-member is made of two elongate pieces which are pivotally connected and which have blind bores formed in their ends which telescopingly receive the rods. The rods can thus telescope to a position in which they extend from the cross-member into the holes formed in the window frame and be retracted to a position in which they do not extend beyond the edges of the board.

Abstract: A skylight or roof opening protective device which comprises a pair of hinged protective frames which pivot outwardly from each other to define an "A" frame, when viewed at either end. Each frame is mounted on a base for temporary or permanent attachment to a skylight or the like.

Abstract: A window guard includes a pair of sliding panels, each of which has integrally formed horizontal and vertical flanges. The panels are interlocked to slide relative to each other in order to accommodate various window widths yet, at the same time, maintaining a high degree of rigidity against bending. The panels each include vent openings which admit air without weakening the apparatus.

Abstract: A security device for buildings comprises a barricade including a metal frame with a metal gridwork anchored thereto and extending across and covering the interior frame opening. The frame is configured to fit within a doorway or window opening. At least one positioning bar is disposed on one side of the frame and extends outward therefrom to beyond the frame perimeter, said positioning bar configured for placing into a receiving slot formed in the interior perimeter of the doorway or window opening. A locking bar is slidably journalled within guide track openings formed in guide tabs which are secured to the barricade. Said locking bar includes at least one perimeter locking end for slidable entry into a receiving slot formed in the interior perimeter of the doorway or window opening.

Abstract: A shutter system and method in which the shutters are normally rolled to a nominal one foot width and have an infinite length, normally no less than two feet and no more than twelve feet is disclosed. These dimensions can be modified on one foot modules. The shutters are provided with a self-secured panel lock assembly at the overlapping joints on the inside between the shutter and windows normally on two foot spacing vertically. This can be horizontal, however, in other applications. The system includes the utilization of an angle frame at the base, and an overlapping receiver as a header. End caps may be of varying shapes but normally are typical L-shaped angles. The shutters are installed by raising the same upwardly and inwardly to the overhang on the upper header, lowering the same to the point where the lower portion overlap has a keyhole slot, aligning the same, and then manually threading the panel lock assembly in place and the bottom lock screw in place.

Abstract: The invention is characterized by at least one bracket 20 which is rotatably attached to a child's safety gate 10. The bracket defines a pedestal anchor 30 which is fixed to the gate, a rotatable clamp 60 being rivet-spring connected thereto, whereby the clip having pads 68 thereon may be pressed against door jamb or passageway walls to secure the gate against displacement, irrespective of shaking forces which may be applied to the gate. The bracket 60 is compressibly mounted relative to the anchor 30 such that the pads thereof clamp the gate against a fixed surface such as wall or doorjamb, supplementing the gate buffers 12, whereby displacement of the gate is rendered impossible.

Abstract: A portable security grill apparatus which may be installed in window openings of buildings includes two rectangular grill sections longitudinally telescopically fastened to one another. Opposite longitudinal ends of the two grill sections have beams disposed perpendicularly to the axis of longitudinal telescoping movability of the two grill sections, the beams having flat outer surfaces adapted to abut a window edge at one end of the grill apparatus, and a window frame edge, at the other end of the apparatus. At least one toggle clamp connected between telescopically joined members of the two grill sections is capable of exerting a large outward extension force when in a closed, clamped position, thereby exerting compressive forces on the window and window frame sufficient to prevent the grill apparatus from being removed from the window opening.

Abstract: A security gate apparatus for attachment across an opening defined by first and second vertical surfaces, including a first gate panel and a second gate panel slidingly connected to the first gate panel so as to permit horizontal extension and retraction of the gate apparatus to a desired horizontal dimension. A first vertical leg is pivotably attached to an outer vertical member of the first gate panel by a first link means and a second vertical leg is pivotably connected to an outer vertical member of the second gate panel by a second link means. The security gate apparatus also includes means for locking the first and second gate panels in the desired horizontal dimension and at least one contact pad on a surface of the first and second vertical legs opposite the outer vertical members of the first and second gate panels, respectively.

Abstract: A grille fastener assembly for releasably securing a wooden grille to a window sash having a generally rectangular-shaped frame with a single pane structure fixed therein includes a spring-loaded plunger assembly. The spring-loaded plunger assembly consists of a base portion, a plunger member and a coil spring. The plunger member and the base portion are movably secured together so as to sandwich the coil spring therebetween. The spring-loaded plunger assembly is telescopingly received in longitudinally extending openings formed in the terminal end portions of the grille bars and includes an enlarged end which is biased outwardly thereof and into respective central openings formed in grille strikes for releasably securing the grille to the sash frame.

Abstract: A decorative insert is provided for a sliding rear window unit in a pickup truck. The unit has a window frame with upper and lower tracks, installed in a back wall of a cab on the pickup truck. The insert consists of a bottom horizontal rail member, a top horizontal rail member and a plurality of bars. Fasteners are for mounting the bars in spaced apart vertical positions between the bottom horizontal rail member and the top horizontal rail member. A component on the bottom horizontal rail member is for engaging with the lower track in the window frame of the sliding rear window unit. An element on the top horizontal rail member is for engaging with the upper track in the window frame of the sliding rear window unit.

Abstract: A safety barrier such as, for example, children or pets, is adapted to be removable secured between two opposed supports, with the barrier including a frame structure and an openable gate. The frame structure includes a rigid lower horizontally extending beam and, at one side thereof, a vertically extending pillar. The gate is hinged to one side of the pillar and, on the other side, to a grid. The frame structure is secured between supports by expanding securing means, with the gate having a locking device expandable against one of the supports.

Abstract: The present invention provides for an improved scaffolding jack system. The present invention provides the top bar that connects the inside vertical posts to the outside vertical posts to have a slidable gate received within the top bar. In a closed position the sliding gate connects the top bar to the inside vertical post and can bear a normal load. In an open position, the sliding gate slides into the top bar to permit a worker to pass easily.

Abstract: A security gate for children having a pair of gate sections that slide relative to each other to vary the effective width of the gate. The sections carry bumpers on their outer vertical side rails, and the bumpers on one side rail are extendable so that they force the bumpers to frictionally engage the sides of an opening to be closed by the gate. Independent of the bumpers brackets are provided on the vertical outer side rails and the sides of the opening to position the gate in the opening and resist the gate from being pushed out of the opening. The gate may be permanently mounted in the opening by hinges or may be removable from the opening.

Abstract: An assembly that includes security bars is mounted in the interior of a structure in registration with a window so that entrance into the structure is denied even when the window is open. Frame members are permanently secured to the structure adjacent the window to be protected, on opposite sides of the window. Complementally formed end piece members are slideably received within their associated frame members and are free to slide upwardly and downwardly with respect to the frame members. A first set of bars extends horizontally from the first end piece towards the second end piece and a second set of bars extends horizontally from the second end piece towards the first end piece. The respective free ends of the first and second sets of bars telescopically engage one another so that the assembly may be fitted to windows of differing widths.

Abstract: A storm shutter apparatus for protectively covering openings in buildings such as windows and doors includes a panel member for fitting over a building opening, a brace member having an end and extending across the panel member, and an assembly for removably securing the end of the brace member to the building adjacent to the building opening. The assembly for removably securing preferably includes an anchor member for attaching to the building, two spaced-apart leg members extending from the anchor member for receiving between them the end of the brace member, and a retaining member for extending over the end of the brace member for retaining the end between the leg members. The brace member may be a unified part of the panel member, attached to the panel member or a separate member placed over the panel member.

Abstract: A child window guard for installation in an open window, such window guard having a base member positioned on the window sill, a lower window sash receipt member and a plurality of vertical members, such vertical members attached at their bottoms at an outward angle to the base member and attached at their tops to the base of the lower window sash receipt member in which lower window sash receipt member the bottom rail of the lower window sash in received.

Abstract: The window guard is mounted within the window frame, interiorly of the window panes. The window guard includes one pair of studs, anchored to opposite legs of the window frame, and a number of bars, interconnecting the studs through the window aperture to prevent unauthorized passage therethrough. The first stud includes transverse bores, for axial engagement by one end of the bars, while the second stud includes transverse notches, for transverse engagement by the other end of the bars. A latch bar is movably mounted inside the second stud, for releasably hooking the rods to the second stud. The latch bar is controlled by a pivotal lever, actuated by a key-operated lock barrel. The lock barrel is accessible only from the inside of the room.

Abstract: A removable window safety guard for a window is provided which consists of a frame mounted within a window opening between side jambs when a lower window sash is raised. A mechanism operated by a control knob is for opening and closing louvers mounted within the frame. A retainer extends between the control knob and one side jamb of the window for preventing removal of the frame from the window opening, so that a child cannot fall out and an intruder cannot enter through the window opening.

Abstract: A portable security grill apparatus which may be installed in window openings of buildings includes two rectangular grill sections longitudinally telescopically fastened to one another. Opposite longitudinal ends of the two grill sections have beams disposed perpendicularly to the axis of longitudinal telescoping movability of the two grill sections, the beams having flat outer surfaces adapted to abut a window edge at one end of the grill apparatus, and a window frame edge, at the other end of the apparatus. At least one toggle clamp connected between telescopically joined members of the two grill sections is capable of exerting a large outward extension force when in a closed, clamped position, thereby exerting compressive forces on the window and window frame sufficient to prevent the grill apparatus from being removed from the window opening.

Abstract: In a gate or similar closure suitable for temporary and quick installation across a passageway comprised of a vertical barrier, frame, and pivotable gate within the frame, a locking apparatus is provided which allows quick and easy width changes of the closure within various widths of passageways. The locking apparatus does not require disassembly from the closure in order to change the width of the passage. The locking apparatus includes rail engaging hooks which wrap substantially circumferentially around the rails of the vertical barrier. The closure is braced in the passageway and locked into position by conventional clamp screws being tightened against the side walls of the passageway, thus forcing the rails into slots defined by the hooks.

Abstract: A rectangular rigid lattice structure contained in a frame that is adapted to be inserted between the upper and lower trackways of a conventional sliding door, with one vertical side of the structure abutting the door jamb and the other vertical side abutting the outer edge of the sliding door. The latter vertical side is equipped with flanges that wrap around the edge of the sliding door and prevent the extraction of the insert without opening or also removing the door. Locking mechanisms suitable for cooperation with the lock and jamb plate of the sliding door may be provided on each side of the insert to fasten the assembly in a closed position. The lattice may constitute a large grille with ornamental features, a small mesh screen capable of preventing insects and small animals from entering the premises, or both.

Abstract: An electric livestock guard or gate for prohibiting the passage of livestock through a roadway opening in a fenced enclosure and which includes a base portion of interlocking segments over which a metallic grid is suspended by springs which mount each end of the grid to spaced insulators carried by the base portion.

Abstract: An adjustable guard assembly constructed to permit quick removability when positioned in an enclosure, has a first and second section, each section including at least one transverse member, a plurality of longitudinally extending members which are secured at one respective end to an associated one of the transverse member. The two sections are mounted for relative axial movement with respect to each other so as to vary the width of the guard assembly and can be fixed at a given width by a resilient release mechanism which is operatively associated with the first section and the second section. The resilient release mechanism can be adjusted to provide a predetermined force necessary for maintaining the sections in their desired longitudinal position and to permit quick removal of the guard assembly from its assembled position in the enclosure when the predetermined force is overcome by any suitable means exerted against the guard assembly in an emergency situation.

Abstract: An removable frame assembly for building apertures that can be readily pushed out by a user in an emergency situations. It includes a fixed frame rigidly mounted to the aperture and a second frame removably mounted to the fixed frame. The removable frame rigidly houses the window for the aperture and, optionally, security bars to prevent trespassers from entering through the window. The security bars can be installed inside or outside the building. A relatively remotely located locking mechanism releasably keeps the fixed and removable frames together. A spring member sandwiched between the fixed and removable frame members urge the separation of the two when the locking mechanism releases them.

Abstract: A window bar security system has a grill of bars positioned outside a building window and held by a plurality of standoffs. Two of the standoffs are latching standoffs and extend from opposite sides of the grill through the wall and into the building and each latching standoffs includes a hole at the distal end. Four other guiding standoffs are inserted into receptacles against coil springs and the four guiding standoffs are positioned in pairs on opposite sides and equi-distant from each latching standoff. A pair of sliding bolt mechanisms are affixed to the inner wall of the building and positioned to permit the sliding bolt of each to fit into one of the latching standoff holes and to be moved towards the center of the window to release the latching standoffs. A pair of security pins are provided with one end designed to fit into a sliding bolt mechanism for preventing the unintentional movement of the sliding bolt and with another end shaped in the form of a hook.

Abstract: A closure is provided that is directed, in the preferred embodiment, to an adjustable gate suitable for confining or preventing small children or pets from entering a secure area. The preferred embodiment of the gate is comprised of two connected panels that are relatively slidable to accommodate doorways of varying width. A thumb screw arrangement is used to fix the relative positions of the panels when roughly adjusting the gate to a particular doorway. Once the gate is roughly adjusted to the doorway a foot-pedal mechanism residing in one of the panels is employed to cause a pair of contact pads to engage the door jamb. As the foot pedal is depressed the contact pad blocks associated with one side of the gate and the bumpers associated with the opposite of the gate engage opposite sides of the door jamb. Further, depression of the foot pedal causes an increasing normal force to be applied to the door jamb that frictionally fixes or wedges the gate in the door jamb.

Abstract: A security closure comprising a panel having inner and outer sides, holding means rigidly secured to or formed on the inner side of the panel, anchor means of a length not substantially less than the height or width of the panel, and at least two spaced apart elongate connector means interconnecting the holding means on the panel and each of the anchor means, each connector means being adapted at one end to be releasably engaged with said spaced holding means and being so connectable with the anchor means as to clamp an opening surround between the panel inner side and the anchor means with the anchor means extending generally parallel to the panel.

Abstract: The invention relates to a barrier apparatus for a framed vertically adjustable rectangular window, the apparatus having an adjustable length for insertion into a window casement of the window. It is slideably positionable within the casement. The barrier apparatus includes a first and a second gridwork panel horizontally spaced on co plan juxtaposition; the panels are rigid rectangular frames adapted to border and support the panels, each frame having horizontally disposed upper and lower borders, and inner and outer vertically oriented side borders, the inner side borders facing each other, the facing side borders having vertically spaced guide holes. Also provided are first and second horizontally directed posts affixed between the upper and lower horizontal borders of each panel, such posts affixed to the facing inner side borders and adapted to slideably penetrate the guide holes, the horizontally directed posts having uniformly spaced pairs of notches.

Abstract: A plurality of concealed attachment clips are used for securing a grill to a window or door frame. The attachment clips are generally of L-shaped configuration, including a flat body portion having a pointed end, which is forcibly urged between the window or door frame and inner surface of the window or door pane. A coupling portion extends at substantially right angular relation from the body portion and includes a dome-shaped detente. The grill is comprised of grill bars, and each grill bar has a semi-spherical recess therein. The ends of the grill bars are forced over the detentes of the clips to releasably secure the grill to the window or door frame.

Abstract: A removable window guard/hinge assembly consisting of a plurality of vertical bars secured to at least two substantially horizontal bars with attached hinges, designed for mounting inside a window frame structure on the interior of the window. One side of each hinge is attached to one end of each horizontal member of the window guard and the other side of each hinge is removably insertable into metal sleeves which are embedded in the vertical member of the window frame structure. The side of the window guard opposite the hinges is secured to the window frame by a suitable lock. This design prevents removal of the window guard while it is closed but allows easy removal when it is opened, by moving the window guard assembly horizontally so that the hinge members slide out of the sleeves which are embedded in the window frame structure. After removal of the window guard/hinge assembly from the window, the remaining holes in the window frame can be concealed with plugs.

Abstract: A window grid attachment device for removably attaching a decorative window grid to a window sash, adjacent a window pane. The device comprises a tubular barrel, a forward opening carried by one end of the barrel, a pin means carried by the barrel which is movable axially between an extended position, in which the tip of the pin protrudes forwardly of the barrel opening, and a retracted position, in which the pin is sheltered within the barrel. A finger operable handle is included for moving the device between extended and retracted positions. A latch means is carried by the barrel for releasibly latching the pin means to the barrel in the retracted position. The device is carried in an axial bore of a window grid member and allowed to contact a window sash in its extended position thereby removably attaching a window grid adjacent a window pane.

Abstract: A security grill structure for preventing entrance through a wall opening. The grill structure comprises a metal peripheral retention frame securable in the wall opening. The frame has opposed parallel channel members interconnected by opposed transverse bars. A lock is provided in one of the channel members and is operable from an inside face of the retention frame. A grill engaging element is secured to each of the transverse bars. A removably engageable metal grill is receivable in an opening defined by the peripheral retention frame and is engageable by the lock, the other channel member and the grill engaging element.

Abstract: A sturdy, effective and economical portable barrier is provided to safely restrain and protect babies, toddlers and pets. The safety barrier comprises spring-biased decorative panels which expand to securely engage a door frame contract to a compact compressed position.

Abstract: Adjustable width doorway safety gate apparatus of this invention discloses a gate comprised of two segments slidably adjustable to variable width doorways and hinges mounted on outer vertical edge of one gate segment, with the hinges consisting of hinge pins pointed downward and fitting in hinge pin sockets mounted on a spring loaded pole or on a doorway pillar and the two gate segments are locked to width by means of a lock spool segment extending through aligned holes in slots in center bar of gate segments, and the center bars ride on offset grooves and matching runners of the center bars, and gate locking upper and lower U latches acting in concert, activated by release of gate lock flexible lever release.

Abstract: A removable window bar for mounting inside a window structure, which window bar is characterized by a parallel top and bottom bar and crossbar, spaced by vertical bars. The bottom bar is removably seated in a pair of bar seats fastened in oppositely disposed relationship to the window facing. A pair of latch stays are also mounted in the window facing above and in spaced relationship with respect to the bar seats, respectively, and a rotatable latch is provided on each of the extending ends of the top bar, which latch is designed to removably engage the latch stay on each window facing and removably secure the removable window bar in position in the window. Rotational manipulation of each latch facilitates removal of the latch from the companion latch stay and lifting of the removably window bar from the bar seats, in order to remove the removable window bar from the window.

Abstract: Apparatus is disclosed to provide a safety gate comprised of two segments, which on being closed, the segments overlap each other and can be locked in this closed position. Each gate segment is mounted on hinges in turn fastened to doorway frame pillars. The overlapping gate segments allow for convenience of fitting various widths of door frames.

Abstract: This invention is related to a safety barrier positionable in a doorway or passageway to prevent the passage of small children or animals. The barrier comprises a frame assembly having a substantially rectangular structure with upper (4, 5, 16) and lower (1) frame elements, each extending from one side of the passageway to the other. The frame assembly is provided with independently adjustable clamping means (12, 13, 14, 15) at each corner thereof for securing within the passageway. At least a portion of the frame assembly is in the form of a gate which is openable to allow access through the barrier. The gate is provided with further clamping means (22) to lock the openable portion in its closed condition, said further clamping means acting to increase the overall stability of the barrier within the passageway.

Abstract: A protective bar for restricting passage through a window type opening in a building structure includes a tubular member adapted to be seated in a recess provided in one side of the window frame with a spring biased slidable bar protruding from the opposite end of the tubular member and adapted to be seated in a recess provided in the opposite window frame member. A malleable material is utilized to form a seat for the spring which biases the rod axially of the tubular member and the malleable material is positively positioned in place by applying axial compression to the material so that it radially expands into a tight frictional relationship with the internal surface of the tubular member. A pull cable release system is also provided which allows the bar to be quickly and easily removed from a location in the interior of the building structure.

Abstract: A mounting device is disclosed for a portable, expansion-type security gate for children or pets. The expansion gate has a variable width with frictional bumpers on each side that frictionally engage a door jamb or other doorway defining member. The mounting device consists of a socket defining mounting member for each frictional bumper that is secured to the door jamb and is configured to receive and retain the frictional bumper. One type of mounting member is configured to mount on flat surfaces such as door jambs and walls. Another mounting member is constructed to mount on a wrought iron railing. Both types rigidly support the security gate and prevent it from being accidentally dislodged.

Abstract: A guard device adapted to bar an opening, such as a window or door of a house, is disclosed comprising in combination a number of bars being adapted to lie across the opening, an inner casing being adapted to secure the bars, an outer casing being adapted to be attached by a fastener about the opening and being adapted to receive the inner casing to cover the fastener, a connector being adapted to releasably connect the inner casing to the outer casing, and a lock adapted to lock and unlock the connector.

Abstract: Improvements in guard devices for windows; a bar carrying frame removably fixable within the runs for the upper sash of a double hung sash window; improvements in guard and protective devices for double hung sash windows wherein the lower sash may be fully opened while the upper sash may be partially opened; window guard improvements where the barred frame member inserted in the window is instantly removable from the inside of the dwelling in case of an emergency such as a fire to enable egress out the window if necessary.

Abstract: The gate is located between opposing vertical surfaces such as door jambs. Left and right sections have their lower portions connected by an intermediate section which forms an opening for a door therebetween. Preferably, the gate comprises a lower horizontal member and an upper member having left and right horizontal portions and a center U-shaped portion in which the door is supported. Panels are located between the upper and lower portions. In use, the gate prevents passage between the door jambs but allows an adult to use the door to pass through the gate.

Abstract: A gate or similar closure suitable for temporary and quick installation across a passageway is comprised of a pair of vertical posts, a vertical barrier extending laterally from one of the posts, and a gate whose pivoting edge is capable of being secured to the barrier at any location along its width, and whose other edge is capable of being latched to the other post. By selecting the point at which the hinge is secured along the width of the barrier, one may adjust the closure to span a range of passageways of varying width.

Abstract: A portable, variable width gate for doorways comprising first and second gate sections operably secured together in face to face relation to alter their combined width for filling doorways of varying widths. Actuator means for relatively moving the gate sections including a handle engaging the actuating means in one position and disengaged therefrom in a second position.

Abstract: A shutter-type window gate device has a hinged shutter panel defining a vertical guide at its unhinged side for guiding a vertical slidable bolt. The vertical slidable bolt is adapted to engage latch elements on the frame of the device in a locked upper position of the bolt. The vertical slidable bolt has a horizontal latching projection to adapted to engage the top of a horizontal resiliently biased bolt, in the locked upper position of the slidable bolt, thereby holding the vertical slidable bolt in its locked position. In the lower, unlocked, position of the vertical slidable bolt, its latching projection is aligned with the resiliently horizontally biased bolt, to enable free vertical movement of the slidable bolt by an operator.

Abstract: A window guard assembly comprising a frame extending around three sides of a window opening and a shutter element received in the frame. The frame comprises channel sections and includes two vertical elements with a horizontal element fixed to the lower ends thereof; and with the channel sections facing one another to receive the shutter. One vertical element includes an upper section which is hinged to open its channel. The shutter comprises a lower section which slides vertically into the lower fixed frame and an upper section which slides horizontally into the upper frame when the hinged sections is opened. The shutter sections are horizontally corrugated and one section is provided with staggered leaves along its meeting edge into which the opposed edge of the other shutter section seats when installed.

Abstract: A device for securing the shafts of buildings, for example light shafts, against forcible intrusion or passage. The device includes at least one hollow blocking bar which spans the shaft transversely and the two ends of which are held in respective anchor members attached to the wall of the shaft with covered bolts and which contains a hollow security rod of substantially the same length. The blocking bar has the form of a polygonal prism the ends of which are received in form-fitting manner in respective recesses of associated respective attachment bases in such a way that they lie in opposing alignment to the mounting bolts of the base and are secured against pull-out by a latch member lock.

Abstract: A removable window security guard which is mountable within the window frame of a double sash window. The guard is engaged and secured within existing channels of the window frame to prevent entry from outside a window. The guard does not require the use of locks or other such devices which would inhibit easy removal of the guard in the event of an emergency. Removal of the guard is accomplished by raising the lower window sash to its maximum height and pulling the guard inwardly and downwardly.

Abstract: A device for protecting panes of windows and glass doors consists of a beam which may be removably engaged in mounting brackets at the sides of, or above and below, the pane, so that the beam is parallel to and spaced from the pane, one or more pressure pads being mounted on the beam for movement to an operative position against, and applying pressure to the inside face of the pane to counteract vibration or flutter of the pane. The beam may have a pelmet fascia fixed to it and, when not in use, may be supported inconspicuously above the window or door.

Abstract: A security unit for a window opening in a building comprising an upper security panel in an upper portion of the window opening, and a lower security panel in the lower portion of the window opening. The lower panel is supported for sliding movement from its installed position in which its lower edge is received in a channel to an upper position to which the panel is withdrawn from the channel and may be removed so that the occupant may get out in an emergency. The lower panel is locked in the installed position by means comprising a pair of pins mounted on a track carried by the upper panel. The pins extend downward and terminate just above the upper edge of the lower panel to prevent it from moving upward away from its installed position far enough to withdraw from the channel.