US3110271A

US3110271A - Vault door construction

Info

Publication number: US3110271A
Application number: US174206A
Authority: US
Inventors: Carl D Graber
Original assignee: Diebold Inc
Current assignee: Diebold Nixdorf Inc
Priority date: 1962-02-20
Filing date: 1962-02-20
Publication date: 1963-11-12
Anticipated expiration: 1980-11-12

Description

c. D. GRABER 3,110,271.

' VAULT DOOR CONSTRUCTION Nov. 12, 196.3

3- Sheets-Sheet 1 Filed Feb. 20, 1962 INV EN TOR. Garb D. Grabber 9m, wwzww ATTORNEYS Nov. 12, 1963 c. D. GRABER VAULT DOOR CONSTRUCTION 3 Sheets-Sheet 2 Filed Feb. 20, 1962 INVENTOR. CwrL D. Grabber 7M0, Mk4

ATTORNEYS Nov. 12, 1963 c. D. GRABYER 3,110,271

VAULT DOOR CONSTRUCTION 3 Sheets-Sheet 3 Filed Feb. 20, 1962 INVENTOR. Ca/rZ/Dfirmber BY I Fm @wvfi'dtw N ATTORNEYS United States Patent Office Patented Nov. 12, 1%63 3,110,271 VAULT DOGR CONSTRUCTION Carl D. Graher, ()rrville, Ohio, assignor to Diehold, Incorporated, Qanton, Ohio, a corporation of ()hio Filed Feb. 2%, 1962, Ser. No. 174,206 it) Claims. (Cl. 109--59) The invention relates to vau-lt door construction for vaults or vault-like structures of any kind used for storing, guarding or protecting any desired articles, objects or materials in a safe and effective manner with maximum security; and particularly, the invention relates to a new concept of vault door construction utilizing interengaging means on the door and door frame at both side edges of the door, but eliminating bolt-Work at the side edges of the door, thereby providing for ease of manufacture 'while achieving maximum security.

A vault structure normally includes a vestibule extend ing through one vault wall. The outer end of the vestibule is normally closed by a hinged vault door. Authorized access to the interior of the vault structure is gained through the vestibule by unlocking the door and swinging the door open on its hinges. Rectangular vestibule openings and doors are preferred since a rectangular vesibule opening achieves the greatest flexibility With minimum obstruction in the design and coordination of the arrangement of walls and inner and outer surfaces of the vault structure, of vestibule opening surfaces, and of related adjacent structures and surfaces.

Security for the contents of a vault, when the vault door is closed, requires the vault door, when seated and locked in the vault door vestibule opening, to be resistant to all kinds of attack measures, external forces and conditions. Thus a closed and locked vault door should combine maximum resistance to mechanical cutting tools, to the intense heat of high temperature torches, to direct explosive forces, to earthquakes and to fire, heat and explosion huards at locations sufficiently near to the vault structure and of such duration as could damage the vault door or the contents of the vault structure unless the vault door, even though damaged by any such hazard, remains as an effective security closure, protecting the contents of the vault structure against the effects or results of the indicated attack measures or hazards.

Certain of these requirements are satisfied by construcing a vault door as a massive slab formed of layers of various materials resistant to direct attack cutting tools, torches and explosive forces. However, it must be possible to move such a massive slab door, which may have a thickness of up to say 42 easily between open and closed positions. A simple hinge mounting provides for easy vault door movement. However, in prior door constructions ordinarily it has been impractical, where thick massive doors have been involved, to use a simple hinge mounting. The provision of clearance, as the door swings to and from closed positions, and the requirement of tightly seating the door in the door frame when closed, have required complicated massive hinge mechanisms and bearings.

In one known prior vault door construction a simple hinge has been used for a massive door, but has required the movement of a door blocking member perpendicular to the plane of the door when closed, into and out of a blocking position, in order to provide clearance for swinging the door between open and closed positions. This prior construction has the advantage of eliminating boltwork required for all other known prior vault door structures. This prior construction, however, has the disadvantage that no interengaging means can be provided between the door frame and swinging side edge of the door, because any interengaging means if present would prevent movement of the described blocking member perpendicular to the plane of the door to provide the necessary swinging clearance.

On the other hand, for attaining maximum security, direct interengagement should exist between both side edges of the door and the effective door frame, when the door is in closed and locked position, accompanied by the elimination of bolt-Work at this location. Bolt-work heretofore has provided the overlap to prevent door movement.

Accordingly, it is a general object of the present invention to simplify the design and construction of massive relatively thick vault doors by eliminating bolt-work and yet achieving maximum security through door and door frame interengagement at the side edges of a rectangular door when the door is closed and locked.

Likewise, it is an object of the present invention to provide a new vault door construction including simple door hinge means, and improved means without any boltwork for interengagingly holding both side edges of the door in the door frame when closed and locked.

Furthermore, it is an object of the present invention to provide a new vault door construction of simplified design which is not dependent upon the hinge structure to maintain the door engaged in the door frame in locked position once locked, whereby the door remains as an effective security closure for the vault door opening even though hinge mechanism accessible at the exterior of the door may be blown off.

Finally, it is an object of the present invention to provide a new vault door construction eliminating the difiiculties heretofore encountered in the art, satisfying the manifold requirements for achieving maximum security in the construction, operation and use of a vault door, eliminating costly manufacturing and assembly problems heretofore involved, and achieving the stated objects in a simplified and inexpensive manner.

These and other objects and advantages, apparent to those skilled in the art from the following description and claims, may be obtained, the stated results achieved, and the described difiiculties overcome by the apparatus, combinations, parts, elements, subcombinations, arrangements and constructions which comprise the present invention, the nature of which is set forth in the following general statement, a preferred embodiment of which-illustrative of the best mode in which applicant has contemplated applying the pr-inciples-is set forth in the following description and shown in the drawings, and which are particularly and distinctly pointed out and set forth in the appended claims forming part hereof.

The nature of the improved vault door construction of the present invention may be stated in general terms as including rectangular door frame means, a massive relatively thick slab door having a hinged side edge and a swinging side edge extending between the ends of the door, hinge means mounting the hinged side edge of the door on the door frame means for hinged door movement into and out of the door frame means for closing or opening the door, the hinged side edge of the door and the adjacent surface of the door frame means being provided with complementary interengaging formations tooth-like in cross-section extending to ad between the ends of the door; the door frame means at the swinging side edge of the door having a fixed frame member, a movable frame member, and a laterally slidable blocking member between the frame members; the swinging side edge of the door and the adjacent surface of the movable frame member being provided with complementary interengaging formations tooth-like in crosssection extending to and between the ends of the door; means for moving the blocking member to a position freeing the movable frame member for movement; and means for moving the movable frame member toward the fixed frame member and away from the swinging side edge of the door when the blocking member is moved to free position to release the interengagement between the movable frame member and the swinging side edge of the door, whereby the door may swing between closed and open positions.

By way of example an embodiment of the improved vault door construction is shown in the accompanying drawings forming part hereof in which:

FIGURE 1 is a somewhat diagrammatic sectional view through a vault door and door frame structure incorporating the improvements of the invention, with the door shown in closed and locked position;

FIG. 2 is a view similar to FIG. 1 with the door in closed position but showing the interengagement between the movable frame member and the door edge released at the swinging side edge of the door; and

FIG. 3 is a View similar to FIG. 2 showing the door swung to open position.

Similar numerals refer to similar parts throughout the drawings.

The improved vault door construction is indicated generally at 1. It may be installed in the vault wall 2 to close a vestibule opening generally indicated at 3 extending through the vault wall 2 from the interior to the exterior of the vault structure.

The vestibule opening 3 may be formed at the hinged side edge of the door by

frame members

4, 5, 6 and 7 structurally integrated with the wall 2. The vestibule opening 3 at the swinging side edge of the door may be formed by fixed frame members 8 and 9, a movable frame member it and a laterally movable blocking member 11 between the

frame members

8 and 10. The fixed frame members 3 and 9 are structurally integrated with the vault wall 2.

The vestibule opening 3 at the extremities of the

frame members

4, 5, 6, 8, l and 11 may be bounded by any usual structural framing elements such as indicated at 12.

The frame members 4 and have

jamb portions

13 and 14 which are angled away from the center line 15 of the vestibule opening outwardly of the vestibule opening 3. The angled jam-b portions 13 and 14- are formed with a series of ribs 16 and intervening valleys 17 extending longitudinally of the members to the extremities of the members providing surfaces which are tooth-like in cross-section.

The door 18 is generally rectangular in shape and may be formed of the desired thickness to obtain the degree of security required. The door is essentially a solid slab formed of layers of various metals, alloys or materials required to resist the various attack measures which might be used directly on the door in an attempt to gain unauthorized access to the interior of the vault structure. Thus the door slab 18 may be formed of layers of open hearth steel, torch resistant steel, copper, and drill resistant steel. Electrical protection devices 19 may be embedded in the doorand similarly in the door 4 frame at 24 and 21. The devices 19, Zil and 21 will signal any attempt to penetrate the door or door frame by any attack measures which penetrate such

electrical protection zones

15, 20 or 21.

The outer portion of the door may be hinged at 22 to the door frame by simple hinge means. The swinging side edge of the door as well as the extremities of the door (not shown) may be provided with a flange 23 overlapping the fixed frame member 8. Thus moistureproof sealing means 24 and 25 may be provided between the door 18 and door frame extending entirely around the door and surrounding the vestibule opening 3.

The door swinging side edge generally indicated at 2s, and the door hinged side edge generally indicated at 27, each is formed between the extremities of the door with tapered faces, as shown, which taper inwardly of each other toward the interior of the vault structure. These faces 26 and 27 are formed with a series of ribs 23 and intervening valleys 29 extending longitudinally of the door edges to and between the extremities thereof providing surfaces which are tooth-like in cross-section and which are complementary to the ribs 16 and valleys 17 formed in the angled jamib portions 13 and i the door frame.

These complementary interengaging angled toothed surfaces of the door and door frame provide for interengagement therebetween securely holding the door engaged in the vestibule opening 3 when the parts are in the position shown in FIG. 1, throughout the extent of the interengaged door and frame surfaces at each of the hinged and swinging side edges of the door 18.

The movable door frame member 10 is pivoted on pivot pins 3% to the door frame by spaced lugs or ears 3 projecting laterally from the vestibule portion 32 :of member 10.. This vestibule portion 32 extends angularly of the angled jamb portion 14 of member 16 The other face 33 of the jamb portion 14 of member if? opposite the toothed formations 16l7 also extends at an angle to the center line 15 of the vestibule and is engaged by the wedge surface 34- of blocking member 11 when the blocking member is in blocking position shown in FIG. 1.

The wedge blocking member 11 has a fiat face 35 parallel with the center line 15 of the vestibule opening 3 and engaged with a similar fiat face 36 of fixed frame member 8 when the blocking member 11 is in blocking position shown in FIG. 1. The blocking member 11 is slidably mounted on the fixed member 8 by slide means 37 for movement in the direction of the arrow 33 paral lel to the center line 15 of the vestibule opening 3 and to the engaged faces 35 and 36.

The blocking member 11 thus functions as a wedge between its angled faces 34 and 35, and member 11 is preferably provided with a secondary wedge member 39 assembled to the member 11 by shear pins 40 for a purpose to be hereinafter described.

Spaced arms 41 fixed to the secondary wedge member 39 near to the extremities thereof project along the rear of and spaced from the blocking wedge member 11. The arms 4-1 have threaded openings 42 engaged by drive screws 43 mounted on the frame member 9 by hearing blocks 44. Bevel gears 45 keyed to the drive screws 43 are driven by bevel pinions 46 on shafts 47 mounted on bearings 48 on frame member 9. Bevel gears 49 on the other ends of the shafts 47 are driven by gears 59 on countershaft 51. Countershaft 51 in turn is driven by another bevel gear 52 at the inner end of drive shaft 53 extending through the vault wall 2 to the exterior where a handwheel '54 may be provided. Alternately, in place of the handwheel 54 or auxiliary thereto, a motor, not shown, may be provided to drive the shaft 53.

The shaft 53 is preferably formed with a reduced shear portion 55 between the handwheel 54 and gear 52; and a lock detent, preferably a flange, notched at 55, is mounted on drive shaft 53 between reduced portion- 55 and gear 52 adapted to be engaged by bolt member 57 of combination lock 58 when the bolt 57 is in locking position. The combination lock 58 is actuated in the usual manner by a spindle 59 extending through the frame member '8 to the exterior of the vault structure where a typical combination lock dial mechanism '69 may be located.

The door 18 is preferably provided with an operating handle 61 which, if desired, may be controlled by a latch mechanism 62 to hold the door latched in locked position until the interengaging means between the door and door frame have been released for opening the door. This latch mechanism 62 for the door handle may have any desired construction such as in the copending Deaton application, Ser. No. 675,298 (Patent No. 3,029,753). A finger 63 preferably projects away from the vestibule opening on each lug 31 of the movable frame member 1t and an adjustable stud 64 is mounted on each finger 63 adapted to be engaged by the rear face 65 of the blocking member 11 as the blocking member is moved in the direction of the arrow 33.

If desired, a daygate as may be mounted at the inner end of the vestibule opening for temporarily and selectively barr'mg access to the vault interior through the vestibule opening 3 in the usual manner when the vault door 13 is in open position.

The operation of the improved vault door construction is as follows. Assume that the parts are in the position shown in FIG. 1. The combination lock 53 is unlocked by dialing the combination at the dial mechanism 63, thus retracting the combination lock bolt 57 to the position shown in full lines in FIG. 2 and releasing its engagement with the notch 56 on the flange carried by blocking member actuating shaft 53. Shaft 53 is now free to turn and may be turned by handwheel 54. Through the

gearing

52, 59, 49, 46 and i and

shafts

51 and 47, the blocking wedge member drive screws 43 are thus rotated in one direction. Rotation of the screws 43 in the threaded openings 42 of arms 41 moves the arms 41 in the direction of the arrow 38. This motion is imparted to the movable blocking member 11 because the arms 41 are fixed to the secondary wedge member 39 which in turn is pinned at All to blocking member 11. Blocking member 11 thus moves on its slide means 37 in the direction of the arrow 38 and continues to move until the rear face 65 of the blocking member 11 engages stud 54.

Further movement of the blocking member 11 in the direction of the arrow 38 pushes the studs 64 to rotate the movable frame member it) on pivot pins 3b to the position shown in FIG. 2.

When the movable frame member it is in the position shown in FIG. 2, the ribs lo and valleys 17 on the jamb portion 14 of member it? are clear of and spaced from the ribs 28 and valleys 2% of the interengageable formations on the swinging side edge of the door, a suificient distance so that the door may be swung on its hinge 22 from closed to open position as indicated by the arcuate dot-dash line 67 in FIG. 2.

In the described open or free position of the movable frame member it after its movement from engaged position as shown in FIG. 1 toward the fixed door member 8, the vestibule portion 32 of member lti is generally parallel with door frame member 5 on the opposite side of the vestibule to present a clear vestibule opening, as shown in FIG. 3.

During movement of the blocking member 11 in the direction of the arrow 38, the drive screws 43 are received in apertures 68 formed in the blocking member ii. The studs of course, may be adjusted so that the movable frame member 1d will be in the position shown in FIG. 2 when the blocking member 11 reaches the limit of its movement in the direction of the arrow 38. At this time, the narrow edge 69 of blocking memher 11 is free of movable frame member 10 permitting frame member it to be moved toward frame member 8 to the position shown in FIG. 2.

The latch mechanism 62, which holds the door or operating handle 61 in the closed position until the interengaging means between the door and door frame have been released may now be operated to unlatched position. The door handle 61 may then be grasped and pulled to swing the door 18 from closed position (FIG. 2) to open position (FIG. 3). The interior of the vault structure is now accessible through the vestibule opening 3 (FIG. 3) by merely opening or closing the dayrgate 66 if a daygate is included in the structure.

The door .18 may be closed and locked from open position of FIG. 3, when desired, by first swinging the door on its hinge 22 from the position of FIG. 3 to that of PEG. 2. The latch mechanism 62 is then actuated to latch the door in closed position. Handwheel 54 is then operated to actuate the drive screws 43 in the reverse direction which moves the blocking member 11 in the opposite direction of arrow 33. The corner 70 of blockring member 11 during such movement engages the angled wedge face 33 of frame member 10 to move frame member 19 away from frame member 8 to the position shown in FIG. 1 when the blocking member 11 arrives at its limit of movement in a direction opposite to the arrow 33, as shown in PEG. 1. At this time the toothlike formations on the jamb members 13 and .14 are engaged with the complementary formations on the edges of the door, as shown, and the wedge blocking member 11 securely blocks the frame member id in the engaged position.

Certain safety devices are incorporated in the structure described. The reduced shear portion 55 on shaft 53 will fail if rotating force is applied to shaft 53 at a time when the combination lock 58 is not unlocked.

When the parts are in the position shown in FIG. 1, the secondary wedge member 39 is held fixed in that position by the arms 41 and the drive screws 43. The blocking member 11, to which the secondary wedge member 39 is connected by shear pins 49, is thus also held fixed. However, if an explosive force is exerted in some manner in an attempt to gain access to the interior of the vault structure, against the end 69 of the blocking member 11, the efiect of which explosive force normally would be to drive blocking member 11 in the direction of arrow 38, the shear pins 40 will fail Upon such failure, movement of member 11 in the direction of arrow 38 will be resisted by the wedge action of secondary wedge member 39 which, meanwhile, continues to be held fixed. Under these conditions, the explosive force only results in more securely wedging the blocking member 11 through the secondary wedge member 39 between the fixed frame member 8 and the movable frame member 10, thus maintaining the interengagement between the door and door frame at the side edges of the door through the extent thereof.

In view of the simplicity of the form of the door, the fixed and movable frame members, and the blocking member constructed in accordance with the present invention, no problems whatsoever are involved in the manufacture of the door of such thickness that is desired for obtaining the required degree of security. At the same time, a maximum degree of security is obtained because of the complete interengagement of both side edges of the door with the door frame throughout the extent of the longitudinal or longer edges of the door.

Accordingly, the present invention provides a new vault door construction which includes a plain and simple rectangular door per se free of moving parts having a pleasing appearance; which may be easily manufactured with the simplest of machining operations; which eliminates bolt-work; which does not depend upon its hinge mechanism for holding the door in locked position when blocked and locked in such position; which may be provided with any desired door thickness to achieve th degree of security desired; which obtains maximum security against unauthorized opening or against release of the door by external forces or conditions through the medium of interengagement between the spaced door edges and the door frame members adjacent such edges; which eliminates difiiculties heretofore encountered in the art and satisfies the manifold requirements for achieving security in the construction and operation of a vault door; and which accomplishes the many new functions hereinabove described and solves problems existing in the art.

In the foregoing description certain terms have been used for brevity, clearness and understanding, but no unnecessary limitations are to be implied therefrom beyond the requirements of the prior art, because such terms are utilized for descriptive purposes herein and not for the purpose of limitation, and are intended to be broadly construed.

Moreover, the description and illustration of the invention is by way of example and the invention is not limited to the exact structure shown, because the sizes, shapes and movements of the various parts may be varied to provide other structural embodiments without departing from the fundamental principles of the invention.

Having now described the features, discoveries and principles of the invention, the operation and use of a preferred form thereof, and the advantageous, new and useful results obtained thereby; the new and useful apparatus, combinations, parts, elements, subcombinations, arrangements and constructions, and mechanical equivalents obvious to those skilled in the art are set forth in the appended claims.

I claim:

1. Vault door construction including rectangular door frame means, a massive rectangular slab door having a hinged side edge and a swinging side edge extending between the ends of the door, hinge means mounting the hinged side edge of the door on the door frame means for hinged door movement into and out of the door frame means for closing and opening the door, the hinged side edge of the door and the adjacent surface of the door frame means being provided with complementary interengaging formations extending to and between the ends of the door; the door frame means at the swinging side edge of the door having a fixed frame member, a movable frame member, and a laterally slidable blocking member between said frame members; the swinging side edge of the door and the adjacent surface of the movable frame member being provided with complementary interengaging formations extending to and between the ends of the door; means for moving the blocking member to a position freeing the movable frame member for movement; and means for moving the movable frame member toward the fixed frame member and away from the swinging side edge of the door when the blocking member is moved to free position to release the interengagement between the movable frame member and the swinging side edge of the door, whereby the door may swing between closed and open positions.

2. The construction defined in claim 1 in which the complementary int-erengaging formations on the door edges and door frame means comprise a series of ribs and intervening grooves providing surfaces which are toothlike in cross-section.

3. The construction defined in claim 1 in which the door has an inner face and an outer face, in which the interengaging formations on the door frame means at the hinged side edge of the door and on the movable frame member are formed in angular jarnb portions which taper outwardly toward the exterior of the door frame means, and in which the interengaging formations on the door side edges are formed in tapered door edge faces that taper inwardly toward the inner face of the door.

4.. The construction defined in claim 1 in which the movable frame member has a vestibule portion and a jamb portion angled with respect to each other, in which the jamb portion has the interengaging formations formed on the angled face thereof adjacent the swinging side edge of the door, in which the jamb portion has an angular wedge face spaced from the angular interengagementformed face; and in which the blocking member has spaced angular faces tapering toward each other outwardly of the door frame means, one of which is slidable on and against the fixed door frame member and the other of which engages the jamb portion angular wedge face.

5. The construction defined in claim 1 in which the means for moving the movable frame member toward the fixed frame member when the blocking member is moved to free position includes a member projecting from the movable frame member engaged by the blocking member during movement of the blocking member toward free position.

6. The construction defined in claim 5 in which the member projecting from the movable frame member and engaged by the blocking member is adjustable.

7. The construction defined in claim 1 in which means is provided for moving the movable fname member from disengaged position to engaged position when the blocking member is moved from free position to a position between the fixed and movable frame members, and in which said means includes an angular surface on the movable frame member engaged by the blocking member during slidable movement of the latter from free position.

8. The construction defined in claim 1 in which the door has an inner face and an outer face, in which the fixed frame member has a face perpendicular to the outer door face, in which the blocking member has angled wedge faces, in which the blocking member is slidably mounted for movement on the fixed frame member with one angled face of the blocking member slidably engaged with the fixed frame member face, in which the movable frame member has an angular wedge face, and in which the other angled face of the blocking member engages the angular wedge face of the movable frame member when the blocking member is in blocking position to hold the interengaging formations on the door and movable frame member interengaged.

9. The construction defined in claim 1 in which the blocking member is wedge-shaped in cross-section with its wedge surfaces engaged by complementary surfaces of the fixed and movable frame members when the blocking member is in blocking position, in which a secondary wedge member is provided having shear-pin connection with the blocking member, and in which the secondary wedge member is held fixed when the door is blocked and locked in closed position, whereby upon imparting a moving force to the blocking member the shear pins will fail and the fixed secondary wedge member will wedge between the blocking member and movable frame member to prevent movement of the blocking member thereby holding the door blocked in closed position.

10. Vault door construction including rectangular door frame means, a massive rectangular slab door having a hinged side edge and a swinging side edge extending between the ends of the door, hinge means mounting the hinged side edge of the door on the door frame means for hinged door movement into and out of the door frame means for closing and opening the door, the hinged side edge of the door and the adjacent surface of the door frame means being provided with complementary interengaging formations extending to and between the ends of the door; the door frame means at the swinging side edge of the door having a fixed frame member, a movable frame member, and la laterally slidable blocking member between said frame members; the swinging side edge of the door and the adjacent surface of the movable frame member being provided with complementary interengaging formations extending to and between the ends of the door; screw means for moving the blocking member betv een a blocking position and a position freeing the movable frame men oer for movement; means pro jeeting from the movable framemember engaged by the blocking member when the latter is moved toward free position to move the movable frame member toward the fixed frame member and away from the swinging side edge of the door to release the interengagement between the movable frame member and the swinging side edge of the door; and an angled face on the movable frame member engaged by the blocking member as the blocking 1% member is moved from free position to blocking position for moving the movable frame member away from the fixed frame member and toward the swinging side edge of the door to re-engage the interengagement between the movable frame member and the swinging side edge of the door.

References fiited in the file of this patent UNITED STATES PATENTS 2,860,584 Deaton et al Nov. 18, 1958

Claims

1. VAULT DOOR CONSTRUCTION INCLUDING RECTANGULAR DOOR FRAME MEANS, A MASSIVE RECTANGULAR SLAB DOOR HAVING A HINGED SIDE EDGE AND A SWINGING SIDE EDGE EXTENDING BETWEEN THE ENDS OF THE DOOR, HINGE MEANS MOUNTING THE HINGED SIDE EDGE OF THE DOOR ON THE DOOR FRAME MEANS FOR HINGED DOOR MOVEMENT INTO AND OUT OF THE DOOR FRAME MEANS FOR CLOSING AND OPENING THE DOOR, THE HINGED SIDE EDGE OF THE DOOR AND THE ADJACENT SURFACE OF THE DOOR FRAME MEANS BEING PROVIDED WITH COMPLEMENTARY INTERENGAGING FORMATIONS EXTENDING TO AND BETWEEN THE ENDS OF THE DOOR; THE DOOR FRAME MEANS AT THE SWINGING SIDE EDGE OF THE DOOR HAVING A FIXED FRAME MEMBER, A MOVABLE FRAME MEMBER, AND A LATERALLY SLIDABLE BLOCKING MEMBER BETWEEN SAID FRAME MEMBERS; THE SWINGING SIDE EDGE OF THE DOOR AND THE ADJACENT SURFACE OF THE MOVABLE FRAME MEMBER BEING PROVIDED WITH COMPLEMENTARY INTERENGAGING FORMATIONS EXTENDING TO AND BETWEEN THE ENDS OF THE DOOR; MEANS FOR MOVING THE BLOCKING MEMBER TO A POSITION FREEING THE MOVABLE FRAME MEMBER FOR MOVEMENT; AND MEANS FOR MOVING THE MOVABLE FRAME MEMBER TOWARD THE FIXED FRAME MEMBER AND