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This security door construction is applicable to safes, factory doors and house doors. An offset hinge assembly allows the door to swing open and closed and also to slide in and out of a door slot in the door frame at the closing edge of the door. In the construction of a safe, hooks on the inside o

This security door construction is applicable to safes, factory doors and house doors. An offset hinge assembly allows the door to swing open and closed and also to slide in and out of a door slot in the door frame at the closing edge of the door. In the construction of a safe, hooks on the inside of the door enter slots in upstands inside the safe and engage and disengage through the sliding motion. One pair of hinges is fixed to the frame and the second pair of hinges is fixed to the door. The frame and door pairs are connected by a rod or tube which ensures that the hinge axis of the door pair remains parallel to the hinge axis of the frame pair. A handwheel is mounted on the door which turns a crank between stops and a link reacts against the rod causing the door to slide easily to LEFT or RIGHT. A spring overcomes resistance to initial movement.

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What is claimed: 1. A security door construction having opposing side portions and comprising: an offset hinge assembly on one side portion of said security door construction; a door having a top and a bottom, an inside and an outside, a closing edge and being slidably movable in a slide motion bet

What is claimed: 1. A security door construction having opposing side portions and comprising: an offset hinge assembly on one side portion of said security door construction; a door having a top and a bottom, an inside and an outside, a closing edge and being slidably movable in a slide motion between an open position and a closed position; a door frame having a top, a bottom, a closing style and an upright against which said door closes, said upright being located on the opposite side portion of said security door construction from said offset hinge assembly, and a door slot for slidingly receiving said closing edge of said door when said door moves into the closed position and for slidingly releasing said closing edge of said door when said door moves to the open position; wherein said door is mounted behind said door frame on said offset hinge assembly, said offset hinge assembly being located behind said door in a space protected by said door, said offset hinge assembly further comprising: a top door hinge operatively connected to the inside and near the top of said door; a bottom door hinge operatively connected to the inside of and near the bottom of said door and being coaxial with said top door hinge; a top door frame hinge operatively connected to said door frame; a bottom door frame hinge operatively connected to said door frame and being coaxial with said top door frame hinge; a top frame pin disposed in said top door frame hinge; a bottom frame pin disposed in said bottom door frame hinge; a first rigid member connected to said top frame pin and said bottom frame pin; a top door pin disposed in said top door hinge; a bottom door pin disposed in said bottom door hinge; and a second rigid member connected to said top door pin and said bottom door pin; wherein said first rigid member and said second rigid member are fixed relative to each other; and a rotatable handle mounted on the outside of said door for opening and closing said door, said handle having a link located behind said door for reacting against said offset hinge assembly to cause said door to slide left or right when said handle is rotated. 2. A security door construction as claimed in claim 1, wherein said first and second rigid members are rods. 3. A security door construction as claimed in claim 1, wherein said first and second rigid members are welded to each other. 4. A security door construction as claimed in claim 1, further comprising: a first upstand fixed to the top of said door frame; and a second upstand fixed to the bottom of said door frame; wherein said top door frame hinge has a top end and said bottom door frame hinge has a bottom end, the top end of said top door frame hinge being fixed to the top of said door frame and to said first upstand, and the bottom end of said bottom door frame hinge being fixed to the bottom of the door frame and said second upstand. 5. A security door construction as claimed in claim 1, wherein said door slot is located between said closing style and said upright. 6. A security door construction as claimed in claim 1, wherein said door slot is located in said closing style. 7. A security door construction as claimed in claim 1, wherein the slide motion is 15-25 mm. 8. A security door construction as claimed in claim 1, further comprising: at least one hook located on the inside of said door; at least one hook slot located on said door frame for receiving said at least one hook located on the inside of said door, wherein said at least one hook engages and disengages said at least one hook slot when said door closes and opens respectively. 9. A security door construction as claimed in claim 1, wherein said door is substantially planar and said door frame has a closing surface parallel to the plane of the closed door, said door tilting against said closing surface to close before said door reaches said door slot. 10. A security door construction as claimed in claim 9, further comprising an L-section support style fixed to said door frame, wherein said closing style forms part of a channel section style assembly, and said door slot is defined by said closing style and said channel section style assembly. 11. A security door construction as claimed in claim 1, further comprising stops located on said door to limit the rotation of said handle, said handle rotating between said stops, and a spring located on said link to assist rotation of said handle by biasing the rotation toward one or the other of said stops. 12. A security door construction as claimed in claim 4, wherein said first upstand is welded to the top of said door frame and said second upstand is welded to the bottom of said door frame. 13. A security door construction as claimed in claim 4, wherein said top end of said top door frame hinge is welded to the top of said door frame and to said first upstand, and the bottom end of said bottom door frame hinge is welded to the bottom of said door frame and said second upstand. 14. A safe comprising: a body made of a single plate panel formed into a channel section, said channel section including styles braced by a top plate and a bottom plate; and a security door construction having opposing side portions and comprising: an offset hinge assembly on one side portion of said security door construction; a door having a top and a bottom, an inside and an outside, a closing edge and being slidably movable in a slide motion between an open position and a closed position; a door frame having a top, a bottom, a closing style and an upright, said door closing against said upright, said upright being located on the opposite side portion of said security door construction from said offset hinge assembly, and a door slot for slidingly receiving said closing edge of said door when said door moves into the closed position and for slidingly releasing said closing edge of said door when said door moves to the open position; wherein said door is mounted behind said door frame on said offset hinge assembly, said offset hinge assembly being located behind said door in a space protected by said door; and a rotatable handle mounted on the outside of said door for opening and closing said door, said handle having a link located behind said door for reacting against said offset hinge assembly to cause said door to slide left or right when said handle is rotated. 15. A security door construction comprising a door having an internal face for protecting a space and a door frame, wherein the door is mounted behind the frame on an offset hinge assembly, the offset hinge assembly being located behind said door in the space protected by the door and having a door hinge fixed to a frame hinge, said offset hinge assembly comprising: a first pair of hinges connected to the frame, a second pair of hinges connected to the door and connecting structure located behind the door connecting the first and second pairs of hinges for maintaining the hinge axis of the first pair of hinges parallel to the hinge axis of the second pair of hinges to prevent sagging of the door, the door hinge being attached to the internal face of the door and the frame hinge being attached to the door hinge to form a unitary assembly; the frame comprising an upright opposite the door hinge, the upright having a door slot capable of receiving a closing edge of the door, the closing edge of the door sliding into the door slot in response to closing of the door and slides out of the door slot in response to opening of the door, and further comprising a rotatable handle mounted on the outside of said door for opening and closing the door, the handle having a link located behind said door for reacting against the offset hinge assembly causing the door to slide left or right when the handle is rotated. 16. A security door construction as claimed in claim 15, wherein each of the first pair of hinges and the second pair of hinges has a pair of opposing, coaxial pockets and a pair of coaxial pins in the respective pockets, and the connecting structure comprises a first rigid member connecting the pockets of one of the first and second pairs of hinges to the pins of the other of the first and second pairs of hinges. 17. A security door construction as claimed in claim 15, wherein a second rigid member connecting the pins of one of the first and second pairs of hinges to the pins of the other of the first and second pairs of hinges. 18. A security door construction as claimed in claim 15, wherein each of the first pair of hinges and the second pair of hinges has a pair of opposing coaxial pockets, and the connecting structure is a rigid member connecting the pockets of one of the first and second pairs of hinges to the pockets of the other of the first and second pairs of hinges. 19. A security door construction as claimed in claim 16, wherein the first rigid member is a rod or tube. 20. A security door construction as claimed in claim 15, wherein each of the first pair of hinges and second pair of hinges comprises opposing, coaxial pockets, and the pockets of one of the first and second pairs of hinges are fixed to the adjacent pockets of the other of the first and second pairs of hinges, and the connecting structure comprises a rod or tube connecting the first and second pairs of hinges. 21. A security door construction as claimed in claim 15, wherein each of the first pair of hinges and second pair of hinges has opposing, coaxial pockets, each pocket having a body and an end, the frame has a top horizontal face and a bottom horizontal face, an upstand welded to one of the top horizontal face and the bottom horizontal face of the frame, and wherein each pocket of the first pair of hinges fixed to the frame is welded at the end of the pocket to the top and bottom horizontal face of the frame, and the body of the pocket of the first pair of hinges is additionally welded to the upstand welded to the top or bottom face of the frame. 22. A security door construction as claimed in claim 15, wherein the frame comprises more than one upright, and the uprights are box section styles. 23. A security door construction as claimed in claim 22, wherein the door slot is in a closing style. 24. A security door construction as claimed in claim 22, wherein the frame is part of a safe, the safe having a body made of a single plate panel, the panel being formed into a channel section, the channel section including box section styles braced by a top plate and a bottom plate. 25. A security door construction as claimed in claim 15, wherein the slide has a motion of 13-25 mm. 26. A security door construction as claimed in claim 15, said door having a rear face, wherein the door frame has a frame rail upstand behind the top and bottom edge of the rear face of the door, each rail has a slot structure and the rear face of the door has a corresponding area corresponding to the slot structure, and hook structure on the corresponding area for engaging and disengaging the slot structure when the door closes and opens. 27. A security door construction as claimed in claim 15, wherein the door frame has a closing surface parallel to the plane of the closed door, the door tilting against the closing surface as the door closes before the door reaches the door slot. 28. A security door construction as claimed in claim 27, wherein the door frame comprises a closing frame member, the closing frame member comprising a closing style, a channel section style assembly and an L-section support style fixed to the frame for cooperating with the closing style to define the slot for the door. 29. A security door construction as claimed in claim 19, wherein the link reacts against the rod or tube to cause the door to slide left or right when the handle is rotated. 30. A security door construction as claimed in claim 15, wherein the door comprises a pair of stops for limiting rotation of the handle and a spring operatively connected to the handle, biasing the rotation of the handle to one or the other of the pair of stops to assist the rotation of the handle. 31. A security door construction as claimed in claim 15, wherein the door has a door casing, the door casing having a header and a sill, the second pair of hinges being fixed to the door. 32. A security door construction as claimed in claim 15, wherein the door is a screen door made of hollow metal extrusions, and the first pair of hinges is fixable to the frame and the second pair of hinges is fixable to an edge of the door. 33. A security door construction as claimed in claim 31, wherein at least part of the second pair of hinges is at least partly located in the door. 34. A security door construction as claimed in claim 33, wherein the door has a support edge with a tunnel at or near the support edge, and the second pair of hinges is housed in the tunnel. 35. A security door construction as claimed in claim 15, and further comprising a door closer arranged to bias the door shut and a biasing assembly associated with the door capable of sliding the door into the door slot when the door closer brings the door into registry with the door slot. 36. A security door construction as claimed in claim 35, wherein the frame has a closing surface adjacent the door slot, and the security door construction further comprises a delaying apparatus for delaying the door movement caused by the biasing assembly until the door lands on the closing surface of the frame adjacent the door slot. 37. A security door construction as claimed in claim 35, further comprising a rod or tube extending between the first pair of hinges, wherein part of the movement of the door is an arc, the arc having an end for placing the door in registration with the door slot, the biasing assembly comprises a door handle, a crank mounted inside the door for reacting against the rod or tube extending between the first pair of hinges, a biasing apparatus acting between the inside of the door and the crank for urging the door to slide toward the door slot, a link assembly connected to the crank for restraining the biasing assembly from imparting the slide motion to the door and a stop extending over at least part of the arc of swing of the door for releasing the link assembly at the end of the arc when the door registers with the door slot. 38. A security door construction as claimed in claim 37, wherein the stop is an arcuate stop, and the arcuate stop is concentric with the hinge axis of the first pair of hinges. 39. A security door construction as claimed in claim 15, wherein said door construction is part of a safe. 40. A security door construction as claimed in claim 31, wherein the door is a pre-hung door. 41. A security door construction as claimed in claim 32, wherein at least part of the second pair of hinges is at least partly located in the screen door. 42. A security door construction as claimed in claim 41, wherein the door has a support edge with a tunnel at or near the support edge, and the second pair of hinges is housed in the tunnel.