US2347705A - Insulated record container - Google Patents

Description

May 2, 1944 E. H. MosLER ETAL 2,347,705

INSULATED RECORD CONTAINER May 2, 1944- E. H. MosLER Erm.

INSULATED RECORD CONTAINER Filed Jan. 5, 1940 2 Sheets-Sheet 2 8 .6. 5 muI 2.1 :r@.,

7 f 1mm@ l iz?. 6

7 INVENTORS EDWIN H. MOSLER BY HARRY H. LYNN 4&0 l, ATToR ,.f f

Patented May 2, 1944 INSULATED RECORD CONTAINER Edwin H. Mosler, New York, N. Y., and Harry H. Lynn, Wyoming, Ohio, assignors to The Mosler Safe Company, Hamilton, Ohio, a corporation f New York Application January 5,1940, serial No. 312,573

a claims. (c1. s- 59) This invention relates to an insulated record cabinet or container or safe which is adapted to withstand high temperatures, crushing forces, and other destructive actions incidental to accidental fire and like disasters.

An object of the invention is to provide a cabinet of the kind mentioned above,4 which includes structural advances that render the cabinet highly protective of its contents, under conditions which would ordinarily melt, distort, mangle or explode other cabinets of the same i general type.

Another object of the invention is to provide an improved closure for insulated record cabinets, which is highly resistant to entry of directed water, heat, flame, dirt and dust, and which is further characterized by an outstanding ability to prevent explosion of the cabinet in the presence of extremely high temperatures Another object is to provide a cabinet and closure arrangement that will withstand the crushing eilect of dropping the cabinet bodily, when closed, lthrough a distance approximating thirty feet, as sometimes occurs in the collapse of a fired building or its flooring.

A further object of the invention is to provide an improved bolt-work for safes and cabinets, and like depositories.

An object also is the accomplishment of the above objects and advantages inexpensively, and with the greatest possible degree of efficiency.

The foregoing and other objects are attained by the means described herein and disclosed in the accompanying drawings, in which:

Flg. 1 is a front elevational view of an insulated record cabinet of the invention, showing the door I thereof in the normal open, yet concealed, position at one side of the cabinet.

Fig. 2 is a cross-sectional view taken horizontally through the cabinet of Fig. 1, but with the door in the closed and bolted condition Fig. 3 is an enlarged fragmental cross-sectional view taken through the cabinet door, on lines 3-3 of Fig. 4, the insulating material being removed.

Fig. 4 is a rear elevational view of the iinproved door and bolt-work embodying the present invention.

The cabinet of this invention is so constructed as to perform the services of an ordinary record ling cabinet having sliding drawers disposed vertically, but embodying also a reinforced and insulated construction in furtherance of the objects stated above. This improved construction embodies also a disappearing door 1, which may enter an auxiliary vertical compartment 8 at one side of the cabinet, when opened. The disappearing feature of the door will not receive detailed treatment in this description, since it is possible to accomplish that in various ways, an example of which is disclosed in the prior art patent of Abbott et al. No. 1,873,247, granted August 23, 1932. Unlike the device of the patent just mentioned, the device of the present invention is devoted more to the problem of preserving the contents thereof, than to that of resisting burglary or forced entry to the contents. Accordingly, various structural dierences will necessarily prevail, for distinguishing the devices one from the other.

Referring to sheet l of the accompanying drawings, 9 indicates the top, l0, the bottom, and II and I2, the side Walls, of an outer shell constituting the cabinet exterior. The cabinet may be placed upon a base I3, if desired. The top and bottom walls preferably are extended as at I4 and l5, to one side of the cabinet, Where they are joined by an exterior Wall I6 to form the auxiliary compartment 8 that houses the disappearing door 1 when the door is open, as illus`- trated in Fig. 1.

Within the auxiliary compartment, there may be provided one or more horizontal tracks li adapted to support a wheeled carriage i8 that carries the hinge leaves I9 of the door l An extension 20 of the door, which substantially closes the front of the auxiliary compartment normally, carries the other hinge leaf 2|, the leaves being joined pivotally by means of a hinge pin 22, as will be understood. Upon opening the door of the cabinet, the door may be positioned in. substantial parallelism with the carriage i8, so that the carriage may be rolled rearwardly upon the track I1 carrying with it the door 1 so that the door will be housed substantially within the auxiliary compartment 8 in substantial parallelism with the walls I2 and I6 of the cabinet. The characters 23 indicate rollers on carriage I8, to facilitate shifting of the carriage as stated. A corner reinforcement 24 may be provided for the auxiliary compartment, at both the front and the rear thereof, if necessary or desirable. As previously stated herein, the details of the carriage are relatively immaterial to the present invention, wherefore a detailed description is deemed unnecessary.

The cabinet proper is lined with an inner shell which is substantially smaller than the outer shell, so that suitable insulating material 25 may be impacted between the shells to protect the contents of the cabinet from intense heat and flame, when required to meet such conditions. The inner shell comprises side-walls 2li, a bottom wall 2li, a top wall 25, and a rear wall 29 which extends substantially the full height of the cabinet. The inner shell may be constructed of light gauge metal, however, it is to be reinforced so as to resist possible crushing and serious distortion in the event that the cabinet be dropped a substantial distance, such as might occur in the event that a floor collapses or becomes weakened by reason of destruction of other parts or" a building. The reinforcement consists in providing a series of sheet metal shelves or partitions 3l), each extending from the rear wall of the cabinet inner shell to a location near the front of the cabinet. The forward edge 3i of each shelf preferably is reinforced by turning it at right angles to the body of the shelf, thereby providing flanges such as 3l. The shelves are securely fixed along their side and rear edges to the inner shell of the cabinet, preferably by means of welding, so that the inner shell with its shelves or partitions, constitutes an integral rigid unit. The characters li of Fig. 2 indicate fusible plugs in the door and outer walls, for the release of gases generated along such walls when subjected to high temperatures.

In constructing the cabinet interior, it is found desirable to terminate the forward edges 33 of the inner shell side, top and bottom walls, at a location remote from the front of the cabinet, and to furnish side, top and bottom door jarnb inserts, indicated at EL3, to complete the forward portion of the inner shell. These inserts preferably overlap the inner shell walls as at 35, and are spot welded thereto at spaced intervals, thereby establishing the desired rigidity. Since the Welds are at spaced intervals, the shell walls and the inserts will not be in intimate contact except at a few points, wherefore there is established at the overlap a heat conductivity break or interruption between the exterior and the interior of the cabinet, for protecting the contents. It will be noted that the jamb inserts are flared outwardly at 35 and then projected inwardly as at 3S, to furnish bolt keeper recesses or channels 3l for accommodating the door bolts. The channels or recesses are continuous about the entry port or doorway of the cabinet. 'Forwardly of the channel or recess of each :lamb insert, the metal is projected on a slight angle to provide the sloping or tapered jamb face 38 which accommodates the complementary jamb face 39 of the door l. At the extreme forward edge of face 38, the insert is turned upon itself as at d to enter a channel il] of the outer shell. Within the channel 4I, which extends circumferentially of the doorway, the flange d of the jamb insert is welded at intervals to the metal of the jamb, thereby further establishing the desirable rigid and integral nature of the cabinet parts.

At this point in the description, attention may be directed to the fact that the various compartments formedbetween the shelves 30 and the top and bottom walls of the inner shell, are adapted to receive filing drawers-or other containers to which access may be desired when the cabinet door i's opened. Such drawers or containers have been omitted from the drawing disclosures in the interest of clarity, and for the further reason that the cabinet need not necessarily be provided with such fixtures.4 y

In furtherance o f some of the objects of this invention, the door. of theA cabinet iS of Special acer/,ree

design, and comprises a rather substantial front plate or panel di?, of which the side extension 2@ preferably is an integral part. Along the top, bottom, and one side edge thereof, the door may be flanged as at 33, these flanges being adapted for reception in the continuous channel lll which bounds or defines the doorway of the cabinet. Another flange for the same purpose, may be provided on a separate upright plate iii which is Welded or otherwise permanently fixed to the in= ner face of panel d2, the separate plate being used also as a reinforcement where the hinge leaf 2l is fixed to the door. Plate @l5 may be flanged also atlit, to strengthen the door structure and to also act as a stop limiting the movement of the door about its hinge connection to the carriage I8.

As clearly illustrated in Fig. 2, a suitable recess lll may be provided in the front plate of the door, for the reception of a manipulating means for the bolts of the door, which manipulating means is in the present embodiment constituted of a handle it pivoted as at i9 upon a crosspiece 5D of the bolt-actuating shaft or spindle 5|. The purpose ofproviding the recess, and of pivotally mounting the handle at 15S, is to enable the handle to be displaced to a position flush with the front of the door when vthe handle is not in use, thereby to eliminate possible interference with disposing the door to the inoperative and substantially concealed position illustrated .in Fig. 1.

The character 32 indicates any acceptable type of lock for the boltwork.

Within the limits of the space defined by flange Alti, and the upper, lower, and edge flanges 33, the inner face of the door front or plate ft2 supports the securing ciianges 52 of the metallic strips 53 that furnish the door jamb areas 35. These strips extend along the top, bottom, and side edges of the door proper, within the limits established by the four flanges indicated at it and M', and may be formed either in separate horizontal and vertical sections, or integrally. as a single strip. Fixation of the strips through theagency of their respective flanges 52, to the inner face of the door panel d2, may be by way of welding or otherwise, as desired.

The free edge 5d of each strip 53 is turned inwardly toward the center of the door, at a distance from the front panel @2, providing a. com partment 55 behind the" major portion of ,the

, door panel, which compaitment is adapted to be packed with'insulating material 5S of any acceptable kind. The flanges function also as the primary supporting means for the bolt-work with which the door is equipped. In the form of the invention illustrated, the two upright flanges 53 of the door are spanned at intervals -by a series of substantial plate-like struts indicated by the characters 5l, 58, and 59, the opposite endsv of which struts are welded orotherwise permanently attached to the said upright flanges 56. In addition to supporting the bon-work and refinforcing the door structure, the plate-like struts serve also to hold the insulating material 55 in position within the internal structure of the door.

The inner finish panel or sheet 60 may aid also the functions mentioned, in addition to imparting a iinished appearance to the inside of the door. This element 60 has been removed from the Fig. 4 illustration and is shown by means of broken lines inFig. 3 in order to most clearly expose the bolt-work and the back of the door. f-

'I'he door bolts hereindisclosed arenot Iof the customary variety, but are formed from elongated steel plates following somewhat the teaching disclosed in the patent of W. Corliss, No. 447,- 488, dated March 3, 1891. In a very general way the Corliss patent discloses the type of bolt plates employed herein. The bolt plates herein are identified by the reference characters 6| and 62 for the vertical bolt plates, and by the characters 83 and 64 for the horizontal bolt plates. I'he several bolt-| plates are arranged for sliding movement to extended and retracted positions, all of them moving outwardly or inwardly in unison when the primary link shifter 65 is rotated by means of the handle I8 located exteriorly of the door. 'I'he opposite ends of each bolt plate are mitered, as indicated generally at 66, preferably at an angle approximating 45. When the bolt plates are fully retracted, as illustrated in Fig. 4, the mitered ends thereof abut, or preferably so.

The three door bolts indicated at 6l, 62, and 53 may be mounted for shiftability relative to the inturned flanges I of the strips 53 in any acceptable manner, such as by providing them with elongated slots 61 through which extend the studs 68 which are anchored to the several flanges 54. Such studs are most clearly illustrated in Fig. -3, and'are seen to include a thread end 69, the threads of which engage the internally threaded bore 10 of a reinforcing metallic bar 1i which backs the circumferential flange assembly 5I. In other words, reinforcing bars such as 1l function as thread nuts into which the screw thread ends of the various bolt plate mounting studs may engage, for anchoring the studs to the door. The characters 12 and 13 indicate, respectively, a spacing washer and a screw adapted for mounting the finish panel or sheet 60 upon the rear of the door. As shown in Fig. 3, the screw 13 may enter a central threaded bore 14 of the mounting stud 68. All of the mounting studs may be utilized in this manner to support the finish panel, if desired.

Attention is now directed to the means shown in Fig. 4 for shifting the bolt plates upon rotation of the handle 48 and its spindle 5i. The primary link shifter 65 conveniently may be formed from a at plate centrally mounted in iixed relationship to the operating spindlel. The end of the spindle that supports the plate may be squared or provided with one or more flats, so that the plate may not rotate relative to the spindle. Pivots 15 on the plate or shifter 55, serve to mount the inner ends 16 and 11 of a pair of T- links 18 and 19 at opposite sides of the spindle 5 I, whereby rotation of the spindle and its associated shifter plate will result in longitudinal reciprocation of the T-links in unison. The head-bar 80 of T-link 18 has its opposite ends perforated as at 8| and 82 for the reception of the turned lugs 83 on each of the secondary shifters 84 and 85. By this means, the vertical shifting of T-link 18 results in rotational movement of the secondary shifters about their respective pivots 86. At the locations 81 and 88 of each of said secondary Shifters, a connection similar to 8I--83 is provided, for shifting longitudinally the pairs of links 89-89 and Sii-90. The links 89 serve to elevate and lower the upper horizontal bolt plate E3 when the bolt-work is actuated, and in like inanner the pair of links "-90 operate upon the vertical bolt plates 6l and 62 for shifting them bodily to extended and retracted positions simultaneously with movement of the bolt plate 83.

At the lower portion of Fig. 4, the head-bar 9i acts in precisely the manner above referred to. to rotate the secondary Shifters 82 and 83 for reciprocating the pairs of links 94-94 and $5- 95. By means of these link pairs, the lower ends of the bolt plates Si and 62, and the lower horizontal bolt plate 84, are adapted t0 be moved in unison with the bolt structures at the upper end of Fig. 4.

From all of the foregoing, it will be understood by reference to Fig. 2, that rotation of the main spindle 5l by means of handle 48, will result in extending all of the bolt plates to the outward limit of travel so that each bolt plate will engage its cooperative channel or groove 31, and since the channels or grooves are joined at their ends to form a continuous recess within the doorway of the cabinet, a rather effective seal will be established when the door is closed and bolted. 'Ihis seal in combination with an insulated door and an insulated cabinet, is most desirable and constitutes an advance in cabinet structures of the insulated type. The reason for this is that any insulating material when subjected to high temperatures will liberate gases, thereby generating high pressures within the cabinet capable of bursting the cabinet if confined too securely, or of igniting and possibly damaging the contents of the cabinet if the gases are liberated too freely from the cabinet interior. By this is meant, that the metal of the cabinet or its closure, when subjected to high temperatures, will promote the liberation of hydrogen gas from the insulating material, and since this gas is of a combustible nature it should be liberated from the cabinet as a slight seepage, rather than freely, in order to minimize the possibility of ignition and explosion within the connes of the cabinet. The type of seal effected by the bolting means of this invention safeguards the cabinet against the hazards mentioned. The insulating material within the door and between the inner and outer shells of the cabinet serves to effectively protect the contents of the cabinet from damage by lire or extreme heat to which the device may be subjected during a conlagration. The door bolting means, being semi-tight to the extent necessary for precluding ignition and explosion of liberated gases within the cabinet, is nevertheless sufliciently tight to prevent rected water and other foreign substances from entering the cabinet under the adverse conditions accompanying and incidental to a conagration.

It sometimes occurs that a floor or other support upon which the cabinet is standing, will collapse and allow the cabinet to plunge for a distance approximating the height of a building story, and under such circumstances it may generally be expected that the cabinet will land with its bottom foremost upon the fioo'r below. The impact resulting from such a plunge will ordinarily be directed against the lower horizontal bolt plate 64, and if the force is sulficient to move that particular bolt plate to the retracted position, the remaining bolt plates would be actuated through the links 95 and all of the other links, to similarly retract each of the bolt plates, thereby leaving the door free to swing open and expose the contents of the cabinet to destruction. To guard against this possibility, the lower horizontal bolt plate 64 is provided with a special type of connection with the bolt-work link structure.

With reference to Fig. 3 and the lower half of Fig. 4, it will be noted that links 95 have their upper ends 81 pivoted at 98 upon the turned lugs oi the secondary bolt shifter-s d2 and de, whereas the lower ends of said links have their studs @El received in the elongated slots d@ of the bolt plate 6d. Accordingly, it might be expected that by restraining the bolt plate @il against downward shiftability, the bolt-work could be actuated to move the links de downwardly without moving the bolt plate, the studs @El traveling freely in the slots ed. But such action does not normally occur, due to the interpositlon or springs ilii, each of which has an upper end lidi abutting a link do or an extension to2 thereof while the opposite end tot oi the spring bears upon, or is fixed to, the bolt plate dfi. From this it will be understood that downward movement or the links 95 is transferred to the bolt plate through the springs tot, so that under normal condi-u tions the bolt plate will move with the links, without any perceptible movement dlnerential. However, in the event that a sharp blow is applied upwardly against the bolt plate iid while the bolt is extended, the springs it@ will absorb the shock of the blow before the force thereof may be transmitted to the links @d to undesirably actuate the entire bolt-work assembly. The relationship of the spring to the link and the bolt plate, is very clearly illustrated by Fig. 3. As shown therein, the lower end it oi the spring is anchored in an aperture ldd provided in a shoulder ltd that extends the 'full length of the bolt plate til. Like all or" the other bolt plates,

the lower bolt plate @t is guided in its upward and downward movements byomeans of the stud and slot arrangement indicated at l-til A reinforcing bar 'll together with flange 55 furnishes the necessary mounting means for the studs 68 which enter the elongated slot @l for guiding the horizontal bolt plate d@ in its movement toward and from the extended and retracted positions.

From the foregoing it should be understood that-the cabinet of this invention when subjected to a sharp impact from below, at any time that the bolts are extended as in Fig. 2, will be safeguarded against accidental retraction of all its boit plates, by reason of the resilient connection between the bolt plate dfi and its associated linkage. The intervention of springs ldd under normal circumstances does not'interfere with the extension and retraction of bolt plate dit simultaneously with the remaining bolt plates. The safety linkage becomes operative only in the emergency heretofore mentioned. It may be noted that the links other than those at o5, have regulation pivotal connections E05 with their respective bolt plates, no lost-motion connection being there required; however, the bolt-work obviously would operate satisfactorily if two or more of the bolt plates were equipped with resilient lost-motion connections illustrated and explained with reference to bolt plate Sd.

Referring now to the extreme left ends f the horizontal bolt plates 53 and Gli, it will be noted that their outer edges |01 and B138, respectively, are provided with rather long inclines or tapers beginning at the points A and extending to the miter of each bolt plate end. 'I'hese tapers or inclines it will be noted, are located adjacent to the hinge region of the door, and their function is to perform as cams to engage the forward portion of the upper and lower jamb areas of the doorway for automatically retracting all of the doon bolts, in the event that the door inadvertently is moved toward the closed position with the bolts extended. .As will be understood, 7d

serious damage might result from an attempt to close the door while the bolts are extended, unless some means were provided for automati cally retracting the bolts. With reference to Fig. i, it may be observed that the inclines or cam surfaces itil and ltd will engage the doorway .of the cabinet at approximately the loca tions B and C, respectively, should the bolts be extended while the door is moved toward the closed position, whereupon a cg action will occur causing the upper and lower bolt plates to be forced inwardlyI to their retracted positions. IThe vertical bolt plates, of course, will likewise retract clue to their connection with the bolt-work, as the latter will necessarily be ac tuated automatically upon forceful retraction of bolt plate S3, for example. Under the clrcum= stances referred to, it will not be necessary for -anyone to manipulate the handle de.

A cabinet structure of the character herein illustrated and described possesses many advantages not heretofore embodied in devices presently known and used. The improved structure is not unduly heavy, and it may therefore be moved about in much the same manner as an ordinary or commonly known le cabinet; yet it furnishes a high degree of protection against internal explosion or destruction of its contents in the event of fire, water and building collapse. The constituents of the improved cabinet are simple and inexpensive, and are not likely to become out of order, so that maintenance costs are low and any necessary repairs may be accomplished inexpensively without returning the cabinet to the factory or other service station. The automatic safety features with which the device is equipped enables it to withstand abuses which would in other cabinet structures result in springing the hinges, the door, or `the cabinet proper, or otherwise iniicting serious damage upon the assembly.

As herelnbefore stated, injury to the cabinet by possible explosion, or destruction of the contents by accidental release of the door bolts resulting from impact, are eectively reduced to a practical minimum in the improved structure of this invention. It is of importance to note that the peripheral closure formed by the four door anges i3 and ld serves, in the closed position of the door, to lock the door and the cabinet body tolgether so as to add structural strength to the combination for opposing any forces tending to crush or distort it. The long side walls of the cabinet are thereby reinforced against bulging' or buckling during a drop, or upon exposureto iire or heat. The flange lock between the door and cabinet also has the effect of obstructing access of atmospheric oxygen to the jamb space along the door edges in the event that the jamb space becomes filled with combustible gases from the cabinet interior. Accordingly, any combustible gases liberated from, the jamb space will have' an opportunity to reach the cabinet exterior along the outer edges of the door, where `combustion thereof will be harmless and reduced in force because the gas will there be unconned. I'heelongated door bolts, being along the extreme inner edges of the door, perform as ilame arresters against any small explosions that might possibly backfire into the j amb spaces, although this possibility is reduced to a practical minimum bythe nanges i3-ld. The elongated door bolts and the flanges J3-dd, therefore, will be seen to inject an unusually high factor of safety, as coordinated herein, protective of the. cabinet contents toan extentheretofore unattained. Other advantages and objects of more or less importance are mentioned in other passages of this description.

It is to be understood that various modifications and changes in the structural details of the device may be made, within the scope of the appended claims, without departing from the spirit of the invention.

What is claimed is:

l. Boltwork for a door having a front panel of rectan'gular formation having a hinge edge, and a rectangular jamb frame on one face of the' panel comprising flanges parallel to the edges of the panel and projected inwardly toward the middle point of the panel, said boltwork comprising a series of elongated horizontal and vertical bolt plates one on each o! the nanges, and means slidably mounting each bolt plate upon its flange for movement to extended and retracted positions in parallelism with the front panel, mitered ends on each bolt plate adapted to abut when the bolt plates are fully retracted, means including links and link shifters on the door, for selective positive extension and retraction of the door bolts from a location at one side of the door panel, and inclines on the upper and lower horizontal bolt plates, said inclines being formed on those outer edges of said plates which are nearest the hinge edge of the door and meeting the mitered ends of said plates at a point such that the inclines will act as cams against a doorway, to automatically retract the vertical as well as the horizontal bolt plates through the agency of the links and link shifters when the door is moved toward a closed position with the bolt plates extended.

2. Boltwork for a door having a front panel of rectangular formation having a hinge edge, and a rectangular jamb frame on one face of the panel comprising flanges'parallel to the edges of the panel and projected inwardly toward the middle point of the panel, said boltwork comprising a series of elongated bolt plates one on each ofthe flanges, and means slidably mounting each bolt plate upon its ange for movement to extended and retracted positions in parallelism with the front panel, mitered ends on each -bolt plate adapted to abut when the bolt plates are fully retracted, means including links and link shifters on the door, for selective positive extension and retraction of the door bolts from a location at one side of the door panel, and yielding means between one only of the bolt plates and its cooperative links, whereby said one bolt plate is rendered shiftable in the bolt retraeting direction independently of the remaining bolt plates.

3. A sealing joint for a cabinet of the class described, which comprises an outer shell having top, bottom, rear and side walls, and a forward continuous door flange channel constituted of grooves formed in all but the rear wall, an inner shell including walls corresponding to those of the outer shell, the inner shell being of reduced size to fit within the outer shell leaving spaces between the corresponding shell walls, insulating material in the spaces between said shell walls, and a door jamb insert of open frame construction fitted to the top, bottom, and side walls of the inner shell, out of intimate full contact withthe walls of the inner shell so as to provide a heat conductivity break between the exterior and the interior of the cabinet, means within the connnes of the forward channel for anchoring the door j amb insert to the outer shell walls, a door for the cabinet including a jamb complementary .to the door jamb insert of the cabinet, elongated shiftable bolts on the door for eiiect'ing a substantial seal interiorly of the door jamb insert when the door is closed and bolted, and flange means on the door for entering the forward channel and concealing the anchoring means therein, thereby substantially sealing the door Ijamb insert exteriorly of the cabinet in the closed condition oi the door, and acting as adliuser preventing the formation of a localized explosive mixture oi gases at the jamb when the door is closed.

4. Boltwork for a door having a front panel of rectangular formation having a vertical hinge edge, a, vertical swinging edge, and opposed hori zontal upper and lower edges, with a rectangular jamb frame on one face of the panel comprising anges parallel to the edges of the panel and projected inwardly toward the middle of the panel, said boltwork comprising horizontal bolt plates shiftably mounted for lateral movement@ upon the upper and lower anges of the jamb frame, and vertical bolt plates similarly mounted upon the vertical flanges of the jamb frame for lateral shifting movement, a bolt plate actuator in the panel, and means including shifters and links having direct pivotal connections with all the bolt plates except the lower horizontal one, whereby positive extension and retraction of said connected bolt plates are effected by manipulation of the actuator, and means for controlling the one bolt plate which is free of the pivotal connections aforesaid, said means comprising a plurality of links each having one end pivoted to a shifter and another end loosely coupled to the free bolt plate, and spring means acting upon each of the links last mentioned, to constantly apply a compressive force to said last mentioned links and to yieldingly urge the latter toward the retracted position, while yieldingly urging said lower horizontal bolt plate to an extended position.

5. BoltWork for a door having a front panel of rectangular formation having a vertical hinge edge, a vertical swinging edge, and opposed horizntal upper and lower edges, with a rectangular jamb frame on one face of the panel comprising ilanges parallel to the edges of the panel and projected inwardly toward the middle of the panel, said bolt comprising horizontal bolt plates shiftably mounted for lateral movement upon the upper and lower anges of the jamb frame, and vertical bolt plates similarly mounted upon the vertical flanges of the jamb frame for lateral shifting movement, a bolt plate actuator in the panel, and means including Shifters and links having direct pivotal connections with all the bolt plates except the lower horizontal one, whereby positive extension and retraction of said ,connected bolt plates are effected by manipulation of the actuator, and means for controlling the one bolt plate which is free of pivotal connections aforesaid, said means comprising a plurality of links each having one end pivoted to a shifter and another end loosely coupled to the free bolt plate, spring means acting upon each of the links last mentioned, to constantly apply a compressive force to said last mentioned links and to yieldingly urge the latter toward the retracted position, while yieldingly urging said one bolt plate to extended position, and an incline on the upper and lower edge of the upper and lower bolt plate, respectively, said inclines being v located at those ends of the referred-to bolt plates which are nearest the hinge edge of the panel, and converged toward one another in the direction of said hinge edge.

6. A sealing joint for a cabinet of theclass decontinuous door -ange channel constituted of grooves formed in all but the rear wall, an inner shellincluding walls corresponding to those of the outer shell, the inner shell being of reduced size to fit within the outer shell leaving spaces between the corresponding shell walls, insulating material in the spaces between said shell walls, and a door jamb insert of open frame construction secured at spacedintervals to the top, bottom,' and side walls of the inner shell, out of intimate full contact with the walls of the inner shell so as to provide a heatconductivity break between the exterior and the interior of the cabinet, means within the contines of the forward channel for anchoring the door jamb insert 'likewise at spaced intervals to the outer shell walls to provide for release of gases generated within the insulation spaces, a door for the cabinet including a Jamb complementary to the door jamb insert of the cabinet, elongated shiftable bolts on the door for eiecting a substantial seal interiorly of the door jamb insert when the door is closed and bolted, and iiange means on the door, for entering the forward channel and concealing the anchoring means therein, thereby substantially sealing the door jamb insert exteriorly of the cabinet in the closed condition of the door, and actingeas a diuser preventing the formation of a localized explosive mixture of gases at the jamb when the door is closed.

7. Boltwork for a door, having a. front panelv of rectangular formation including a vertical hinge edge. a vertical swinging edge. and opposed horizontal upper and lower edges, with a rectangular Jamb frame on one face of the panel', supporting means for bolt plates disposed at, the rear of the panel, horizontal bolt plates shiftably mounted for lateral movement relative to the bolt plate supporting means, and vertical bolt plates mounted upon the supporting means for lateral shifting movement, a bolt plate actuator in the panel, means including Shifters and links having direct pivotal connections with all the bolt plates except the lower horizontal one, whereby positive extension and retraction of said connected bolt plates are effected by manipulation of the actuator, and means for controlling the one bolt plate which is free of the pivotal

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