Abstract:
A security door is mounted for hinged movement on a frame and includes a wrap-around right-angle member mounted for pivotal movement at an edge of the door. In use the wrap-around member projects over a portion of the frame and provides additional locking. In a preferred form the member is controlled by a bar that also inserts and withdraws one or more locking bolts at the same time.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     The present invention relates to a security door.  
         [0002]     Heavy duty doors, to be used for security purposes, are well known. Such doors may be provided within or at entrances to buildings where there is a risk of unauthorised entry. One example is the security of vacant property, where a normal entrance door is replaced with a temporary steel reinforced security door. A higher degree of resistance to physical attack is available from this type of door.  
         [0003]     Prior art security doors commonly have at least two conventional lock points, the keys to which are passed from one user to another when required. Control and tracking of the keys can become a problem or, at least, inconvenience. Time can be wasted in delivering keys between authorised users.  
       SUMMARY OF THE INVENTION  
       [0004]     In one broad aspect of the present invention there is provided a security door to be mounted for hinged movement on a frame, there being a wrap-around member mounted for pivotal movement at or adjacent an edge of the door to, in use, project over a portion of the frame.  
         [0005]     In a preferred form the wrap-around member is situated to project over the frame at a side of the doorway opposed to an opening direction of the door. Preferably, an edge of the door includes an extending portion (security strip) over the frame at the same side as the opening direction of the door.  
         [0006]     The wrap-around member may be described simply as a hinged means, that is hinged with an edge of the door at one part and has another edge that swings (“wraps around”) to extend over the frame.  
         [0007]     In a preferred form the present invention introduces a “dual locking” feature where one or more bolts are provided to be, in use, extendible into an adjacent doorframe, in addition to the wrap around feature. Preferably the movement of both the bolts and wrap around member is actuated from the same control means.  
         [0008]     The present invention provides improved security to prevent break-in over the prior art. Particularly, due to the wrap-around feature on the “inside” of the door and an additional extending edge portion on the “outside” of the door, methods of forcing a door open are foiled.  
         [0009]     Security can be further improved by including an extending portion over the frame at the hinge side of the door but on the side opposite the opening direction. This prevents the door being pulled outward from the doorframe. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0010]     In the accompanying drawings:  
         [0011]      FIG. 1  is a plan view of a door and frame,  
         [0012]      FIG. 2  is a side elevation view of a door according to the present invention,  
         [0013]      FIG. 3  is a plan view of a section of security door according to the present invention,  
         [0014]      FIG. 4  is a plan view of a section of a security door,  
         [0015]      FIG. 5  is a plan detail view of an opening mechanism in a door according to the present invention,  
         [0016]      FIG. 6  is a side elevation detail view of the door from  FIG. 5 ,  
         [0017]      FIG. 7  is a sequential view of a door opening mechanism; and  
         [0018]      FIG. 8  is a side view of detail indicated in  FIG. 6 . 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0019]     Referring firstly to  FIG. 1 , a door arrangement such as is applicable to the present invention is shown in plan view. A main door leaf  11  is mounted to a frame F 1  by a hinge  12  in the normal way. The illustrated door also has a security strip  13  that surrounds three edges of the door (the “top” and “bottom” strips cannot be seen in the plan view). Strip  13  protects the externally visible gap between the door leaf  11  and frame F 1 /F 2 . An internal security angled member  14  extends perpendicularly (then parallel) from an edge of leaf  11  behind hinge  12 , allowing the door leaf  11  to swing in only one (outward) direction A. The overhang  14 a of member  14  with the frame F 1  prevents the door from being pulled out of the frame even if the hinges  12  were broken or the pin removed. The top and bottom extension of strip  13  prevent the door swinging the other way (inward).  
         [0020]     A view from the inside of the door, including a mechanism according to the present invention, is shown by  FIG. 2 . In this view, welded to the back of the door leaf  11  are guide tubes  15  that carry locking bolts  16  in at least two positions. Movement of bolts  16  in unison is controlled by a box section control bar  17 . When bar  17  moves in the direction of arrows B and C the bolts  16  are inserted or withdrawn respectively from corresponding holes formed in the frame F 2 . Generally, a lock bolt feature into a frame surrounding a doorway of this type is known to the prior art. Detail of the lock bolts  16  is best seen by  FIG. 4  (a locked and unlocked position section X-X).  
         [0021]     In addition to the lock bolt feature of  FIG. 4 a  “wrap-around” member  18  is provided, illustrated by  FIG. 3  (section Y-Y taken from  FIG. 2 ). Member  18  is an elongate bar with a right angle, to appear substantially L-shaped in plan view. Three hinged positions  19 ,  20  and  21  operate a pivoting movement of member  18 , controlled by the same bar  17  as operates bolt  16 . The first hinge  19  is located to join door leaf  11  and an edge of member  18  at an edge  22  of said leaf. The second hinge  20  is located at the right angle of the L-shaped member  18 , pivotally connecting it via a connector  23  to the third hinge point  21  that is at the bar  17  adjacent where it contacts (slidably over the surface) door leaf  11 . Note that bar  17  is generally held in position for sliding movement by the guide tubes  15  and the lock bolts  16  that slide within them.  
         [0022]     The elongation of member  18  may be of limited length or along most of the edge of leaf  11  adjacent F 2 .  
         [0023]     The top view of  FIG. 3  shows the wrap-around member  18  in a locked position where the leg of the L-shape distal from the first hinge  19  projects over frame F 2 . It will be clear that the door leaf  11  cannot be opened in the direction A (shown in  FIG. 1 ) when the member  18  is in a locked position. As bar  17  moves in direction C member  18  swings away to allow the door to be opened. Bar  17  moves locking bolts  16  ( FIG. 4 ) at the same time to withdraw and unlock the door.  
         [0024]     In  FIG. 3  (and  FIG. 1 ) the door leaf  11  also includes an elongate perpendicularly protruding surface  11   a  at an edge adjacent frame F 2 , this creates a right angle within which hinge  19  is nestled and a stop means against which member  18  can swing no further to protrude over frame F 2 . However, this component is not essential.  
         [0025]     The mechanisms of  FIGS. 3 and 4  provide a dual locking combination for additional security, but operated by the common control bar  17 . The wrap-around member  18  is another line of defence, should strip  13  be pried away and bolts  16  cut with some hack-saw edge.  
         [0026]      FIGS. 5 and 6  illustrate ways of causing movement to bar  17  that in turn operate the bolts  16  and wrap-around member  18 .  
         [0027]     A first option is total manual operation of control bar  17  by use of two conventional lever locks (one lock  24  is shown in hard lines in  FIG. 5  and another in dotted detail only). The locks are mounted either side of and with tongues  24   a  facing bar  17 . One lock is used to move the control bar to the left (in  FIG. 5  this corresponds to locking the door), and the other to the right (unlocking). By operating the appropriate lock with keys in sequence the door, via bar  17 , may be locked and unlocked.  
         [0028]      FIG. 5  also illustrates a second option (but shown in the same drawing for convenience), featuring an externally accessible free moving locking block  25 . In this option, to lock the door the control bar  17  is moved to the locked (arrow B) position by locking block  25 . The control bar  17  will then become immoveable from the outside once in the locked position. Control bar  17  is fitted with a latch  26  to ensure that it does not move to the unlocked (arrow C) position.  
         [0029]     To unlock the door a motor and gearbox combination  27  is used to which a double cam is fitted. As illustrated by  FIG. 7 , one cam is used to override the latch and the other to push the bar  17  to the unlocked position (the last of the  FIG. 7  sequence).  
         [0030]     Handle  28  is available to allow personnel within the secure building to manually lock and unlock the door.  
         [0031]      FIG. 8  shows a microswitch  28  viewed from arrow Z of  FIG. 6 . The microswitch simply relays information to an electronic system as to whether bar  17  has been moved into locked (as pictured) or unlocked position by block  25 . A narrow sliding member  29  includes contours that receive the microswitch and an end that contacts block  25 .  
         [0032]     The implementation of the lock/unlock states of the second option can be entirely motorized and controlled electronically, even at a distance (remote control) or by PIN numbers from an external keypad.  
         [0033]     Personal Identification Numbers are not always secure and can fall into unauthorised hands; therefore a system can be implemented with the present invention that improves this security. This system includes use of a GSM (Global System Mobile) component that will allow communications with a control centre via cellular telephone networks. This communication will allow PINs to be changed and monitoring of when the door is opened, remote opening and status reports (it is intended for the system to be battery operated—e.g. with a 12 month life).  
         [0034]     The control centre has an automated computer system that will generate random PINs and remotely program the door. As an example, at installation it is intended that the control unit will be placed in “receiver” mode. The technician will then contact the control centre to remotely programme the control unit with up to five randomly generated PINs. After receiving this information the control unit will power down to a “standby” mode. The technician will then lock the door and leave the site.  
         [0035]     Battery drainage in standby is relatively negligible, however, on a periodic basis the unit will contact the GSM system to report its status and receive any new programming (PINs etc).  
         [0036]     If access is required to a site, the user contacts the control centre to obtain a PIN. This PIN may only be valid for a limited period (1 use, 1 day etc). The PIN will then change after this period regardless of whether it is used.  
         [0037]     The control centre can track all this information such that an audit will reveal who requested PINs, when they were used etc, for a large number of door installations at different sites.  
         [0038]     The keypad interface may also enable a “manual call” to the control centre by entering a special sequence. Furthermore, the keypad/control unit can place an emergency call if it is tampered with.