Abstract:
A training door for breaching tools has a frame on which the door is hung by hinges at a hinge edge, while at an opposite edge being retained to a jamb by one or more non-shearing bolts. When the door is forced by a breaching tool at the bolt location, the jamb is forced laterally away from the door edge, against rubber mounts that allow limited jamb movement. As the door is forced in (or out, depending on its swing direction), with the jamb spread away somewhat the bolt will bend and fail pulling out of its socket. Replaceable sleeves are secured to the door edge, in several sections of the door to avoid breach tool damage on the door itself.

Description:
This application claims benefit of provisional application No. 61/688,111, filed May 7, 2012. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention concerns breaching of entry doors by force, such as by police or military personnel, and specifically a training door for training the use of breaching tools, a door that can be used many times without replacement. 
     Breaching tools are used to quickly force open doors and windows in emergency situations. Special tools have been developed for this purpose, large crowbar-like steel tools with specially-designed heads or working ends. Training is required for the proper and most efficient use of these tools, and for this purpose training doors have been produced and found effective in demonstration of breaching tools and the correct techniques of their use. 
     U.S. Pat. No. 6,877,988 describes one type of breach training door. That door is based on shear pins that extend between bores of a door edge and of a door jamb, in the positions of deadbolts. When the door is forced using breaching tools the pin or pins will shear off to allow the door to open. In the system described in the patent, the door can sustain damage over several breachings, requiring its repair or replacement. In addition, many deadbolts in actual breaching situations will not shear, but instead will bend to the point that, along with the forced movement of the jamb spreading away from the door, will allow the door to be forced open. 
     Ideally, a breach training door/frame assembly would closely simulate the breach conditions of typical actual entry doors, would be easily resettable after a breach, would be virtually undamaged after a breach, would adapt to uneven terrain for use outdoors, and would permit the use of hydraulic breaching tools without damage to the door or frame. 
     SUMMARY OF THE INVENTION 
     The breach training door of the invention meets these requirements with an efficient, rugged door and frame assembly supported by adjustable leveling struts at left and right sides. One or more deadbolts acting between the door edge and jamb are simulated by heavy, bendable bolts which can be at any or all of multiple points along the height of the door. The frame comprises three fixed members—threshold, overhead and upright hinge side—and a jamb that can be spread laterally away from the door with sufficient breaching force. Rubber mounts at top and bottom enable this displacement, with a fixed stop to limit the movement, allowing the use of hydraulic spreader tools without damage. Battering rams can also be used, with limited damage. 
     For extended life of the door assembly, replaceable metal sleeves cover the door edge, and these may be in two or three sections down the door edge to localize damage to the sleeves from the breaching tools. Sleeves may also be secured on the jamb, for the same purpose. Quick-connection fastening is provided, to replace a protective sleeve when needed. 
     It is among the objects of the invention to improve stability, performance, ruggedness, utility, training value and economy of a breaching training door. These and other objects, advantages and features of the invention will be apparent from the following description of a preferred embodiment, considered along with the accompanying drawings. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing a breach training door of the invention. 
         FIG. 2  is another perspective view of the door, showing support struts for retaining the door and frame assembly upright. 
         FIG. 3  is a front elevation view of the door and frame assembly. 
         FIG. 4  is an elevation view with a detail of the door jamb mounting. 
         FIG. 5  is a perspective view with another detail of the door jamb mounting. 
         FIG. 6  is a top plan detail view, again showing the door jamb mounting. 
         FIG. 7  is a plan cross section view showing the door and jamb, the door being locked in place by one or more lock bolt-simulating pins. 
         FIG. 8  is a detail perspective view indicating a preferred manner of fastening protective sleeves to the door edge. 
         FIG. 9  is a perspective view showing the door and frame assembly and indicating three protective sleeves to be assembled onto the door edge. 
         FIG. 10  is a perspective view showing the door/frame assembly from the side opposite that of  FIGS. 1 and 2 . 
         FIG. 11  is another perspective view of the door/frame assembly showing a simulated side wall secured to the frame at right angles to the door. 
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       FIG. 1  shows an assembly  10  of a training door  12  and frame  14 . The frame  14  is composed of rigidly fixed together horizontal threshold member  16 , overhead horizontal member  18  and hinge side upright member  20 , and an upright jamb  22  which is afforded limited outward (to left in the drawing) displacement when the door  12  is breached using a breaching tool. All structural components  16 ,  18 ,  20  and  22  of the door frame are of steel or other high strength metal, and preferably the door as well. Hinges are shown at  24  in  FIGS. 1 and 2 , and the door handle at  26 , for this door  12  that swings outwardly as seen in the drawing. Breaching tools can be applied to breach the door from either the outwardly swinging side seen in  FIG. 1 or 2 , or from the opposite side, at which the door opens away from the breacher (swinging inwardly to a building). 
       FIG. 2  shows the door/frame assembly  10  supported in the upright position by left and right strut frames or A-frames  28 . These consist of structural channels or box beams, for example, as shown at  30  (base members) and  32  (obliquely angled struts). The struts  32  are secured to the base members  30  in pivoted connections, and to the top of the door frame via connection brackets  34 . The base members  30  are also secured to the door frame via brackets  34 . The front left strut is omitted in  FIG. 2  for clarity. An important aspect of the invention is the connection of each strut at the top end to the door frame. This is via slotted fastener holes  36  in the struts, through which bolts (not shown) connect the strut to the connector bracket  34 . By these connections the door can be adjusted to a substantially upright plane position even on sloped outdoor terrain, where breaching training of it is conducted. 
       FIG. 3  shows the door/frame assembly  10 , again from the outward-swinging side, in greater detail. The door  12  preferably is metal, or at least has a heavy metal plate  40  at its surface. The door handle  26  is mounted in a security plate  42  near the door latching edge  44 . The door edge is protected by protector sleeves  46 , preferably of steel, which may be ¼ inch thick structural steel channels. As shown, three protector sleeve sections  46  can be provided, so that damage from a breaching tool is localized. These heavy steel protectors will endure multiple exercises and may need replacement only after a dozen or more breachings against the particular protector. When needed, the protector sleeves are quickly removable and replaceable on the door edge as explained below. 
       FIGS. 3 through 6  show an important feature of the breaching door assembly, allowing forceable displacement of the door jamb  22  without damage. At both top and bottom, the jamb  22  engages with a horizontal plate  50 , by nesting in a recess  50   a  of the plate (where it may be welded). The plate  50  restrains outward displacement of the jamb  22  away from the door edge, by rubber discs or bushings  52  secured to the plate  50  with machine bolts  54 . The bushings  52 , which may be automotive engine mounts or similar heavy rubber discs or blocks, are firmly held between the jamb-connected plate  50  and a parallel plate  56  above (in the case of the upper end) or below (in the case of the lower end of the jamb). That plate  56  is fixed permanently to the overhead door frame member  18  (and to the threshold horizontal frame member  16  at the lower end). The connection is preferably via a weld to the frame member  18  (or  16 ), or by weld to an intermediate connecting bracket or plate, not seen in the drawing (even if not welded, the jamb  22  is connected to the threshold and upper horizontal frame members  16  and  18  in this way). Thus, the plate  50  moves differentially to the plate  56  when the jamb is forced outwardly during a breach exercise. The rubber mounts or bushings  52  are racked, distorted in shape by the differential movement, when the jamb and plate  50  are forced to the left as seen in  FIGS. 3, 4 and 5 . 
     The breaching door assembly of the invention has an important feature preventing damage to the assembly from over-displacement of the jamb. A hard stop in the displacement in the jamb is provided by a heavy plate  58  acting as an end plate to put a fixed limit on outward displacement of the plate  50  and of the door jamb. The stop plate or end plate  58  is fixed to a bracket  60  that is in turn fixed, as by welding, to the overhead structural frame member  18 . The limit of travel may be about 20 to 25 millimeters, i.e. about one inch, at which limit the jamb-connected plate  50  abuts with the stop plate  58 . 
     Note that the machine bolts  54  reside in plate holes or slots  62  that are large enough not to bind with the bolts during displacement, which could prematurely limit displacement or distort the bolts or plates. 
       FIGS. 1-3 and 6  also show pairs of steel brackets  63 , essentially U-shaped loops, at top and bottom of the door near the latching edge  44 . Of each pair one is on the door and one on the door frame. Each pair of loops or brackets is configured to receive wood door-blocking stakes or pegs (not shown) inserted vertically into the loops, fitting snugly, to hold the door shut from the outwardly-opening side so as to resist opening when breaching tools are used at the opposite side. One, two or three wood stakes (e.g. about 1″×½″ each) can be put in each pair of loops for selected resistance against door breach, for varied levels of training. These break on a successful breach of the door. Breach tools or battering rams can be used. The breaking stick lock points can be with the stakes alone or in combination with one or more of the bolt-simulating pins as described below in reference to  FIG. 7 . 
       FIG. 7  shows in plan cross section a portion of the door  12  and the jamb  22  adjacent to the door edge, and revealing a pin  64  that acts a locking bolt between the door  12  of the jamb  22 . The pin resides in bores of the door and the jamb, and extends through the protector sleeve  46  as indicated. To load a pin  64  into the bolt-locking position, the pin is put into a recess  66  in the side of the door not seen in  FIGS. 1-3 , i.e. the door side used for training on inwardly swinging entry doors. The pin is put into the slot  66  and then through the door bore and into the jamb as shown. The pin is difficult to retrieve once put in position. As indicated, the lock bolt-simulating pin  64  is positioned in solid portions of the door and the jamb. The recesses and bores can be at, for example, six positions along the door edge for six different lock points. Any number of them can be used for a training exercise. 
       FIG. 7  also shows a machine bolt  68  that retains the protector sleeve  46  in place on the door. 
       FIG. 8  shows in perspective a portion of the door and indicates in better detail the quick-release retention means for retaining the replaceable protector sleeves  46  in place on the door edge. The machine bolts  68 , which can be screwed into threaded holes in a solid metal portion of the door or through bolts with nuts on the opposite side, are loosened for removal of a damaged protector sleeve  46 . The sleeve is then lifted up and pulled out, to the left in the drawings, off the edge of the door. A replacement protector sleeve is then inserted over the bolts, and dropped into place, and the bolts are tightened. 
       FIG. 9  indicates the preferred series of three protector sleeves assembled down the edge of the door. A single sleeve could be used if desired, but the system is more economical if two or three sections are used, each separately replaceable, so the distortion or damage is localized and each section can be replaced individually and only as needed. 
       FIG. 10  shows the door/frame assembly  10  from the back side, i.e. the opposite from that of  FIGS. 1 and 2 , and the side from which one practices breaching an inwardly-swinging door. In the door  12  illustrated, the door side  70  is shown with laterally extending structural members  72 . Secured to these lateral members, or to other structure of the door, is a metal bracket  74  with two U-shaped portions as shown, for the purpose of receiving one or several 4″×4″ lengths of dimensional lumber, in vertical orientation. This is to provide a heavy wood surface to batter the door for breaching, for training in breaching an inwardly-swinging entry door. Breaching can also be used for breaching between the door and the jamb. 
       FIG. 11  shows in perspective the door/frame assembly  10 , with a sheet of plywood  76  secured to the frame and oriented at right angles to the door  12 , so as to simulate a side wall that is close to the latching edge of the door in an outwardly-swinging entry door situation. This use of breaching tools is somewhat more difficult and requires certain technique that can be trained for using the assembly shown. The plywood sheet  76  can be retained to the frame by brackets connected to the strut frame  28  (brackets not shown). 
     The above described preferred embodiments are intended to illustrate the principles of the invention, but not to limit its scope. Other embodiments and variations to these preferred embodiments will be apparent to those skilled in the art and may be made without departing from the spirit and scope of the invention as defined in the following claims.