Personnel door for a RF shielded room

• US 4,953,324 A
• Filed: 03/30/1989
• Issued: 09/04/1990
• Est. Priority Date: 12/07/1987
• Status: Expired due to Fees

• Current Assignee: Nova-Tech Engineering, Inc. (AIT Holdings LP)
• Original Assignee: Nova-Tech Engineering, Inc. (AIT Holdings LP)
• Inventors: Herrmann, Karl H.
• Primary Examiner(s): Brittain, James R.
• Application Number:
  US07/330,828
• Time in Patent Office: 523 Days
• Field of Search: 49/255, 49/256, 49/258, 49/477, 49/190, 49/156, 174/35 MS
• US Class Current: 49/255
• CPC Class Codes: E05F 7/02 for raising wings before being turned before sliding E05D15/565
• CPC Class Codes: E05Y 2900/132 Doors
• CPC Class Codes: E06B 5/18 against harmful radiation against heat E06B5/16

Abstract

A personnel door for sealing a room having a source of Radio Frequency (RF) radiation. The door when swung into a closed position can be energized to be partially disposed in an opening below floor level directly beneath the door. Sealing between the door and the door frame of the room can occur around the borders of the door including the part disposed in the opening below floor level. A step up into the room or use of a ramp to gain access to the room is thereby eliminated. In the preferred embodiment, the door is retained above the opening below floor level by springs and energized to move vertically downward into the opening against the force of the springs by an air cylinder.

Claims

1. A sealing system to prevent RF radiation leakage into or from a room having an access aperture extending to the floor of the room comprising

a. a door leaf;

b. a floor;

c. an opening below floor level directly under said door leaf and outside of the access aperture;

d. a door frame having a top portion located at the borders of the access aperature, the door frame having a bottom portion disposed in said opening below floor level;

e. slidable hinging means attached to said door leaf and said door leaf and said door frame, said slidable hinging means allowing vertical movement of said door leaf relative to said door frame while allowing said door leaf to pivot relative to said door frame;

f. retaining means for retaining said door leaf in a first position above said opening below floor level when said door leaf is in a closed position relative to the access aperature;

g. energizing means for overcoming said retaining means and sliding said door leaf vertically relative to said door frame to a second position so as to partially dispose said door leaf in said opening below floor level and align the borders of said door leaf with the top and bottom portion of said door frame.

h. locking means which simultaneously locks said door leaf in a fixed position relative to said door frame as said door leaf is lowered to the second position partially disposed in said opening below floor level, said locking means including top locking means which locks the top of said door leaf and said door frame, said locking means further including first side locking means for locking the side of said door leaf having said slidable hinge means, said first side locking means independent of said slidable hinge means, and includes pin means attached to said door frame and adapted to be received by first slot means attached to said door leaf.

2. The apparatus of claim 1 which includes holding means adjacent said door leaf and said door frame for maintaining said door leaf and said door frame in contact.

3. The apparatus of claim 2 wherein said holding means extends around the borders of said door leaf and said door frame.

4. The apparatus of claim 1 wherein said top locking means includes bracket means attached to said door leaf and slot means in said door frame adapted to receive said brackets when said door leaf is in said second position.

5. The apparatus of claim 1 wherein said energizing means is an air cylinder.

6. A sealing system to prevent RF radiation leakage into or from a room having an access aperature extending to the floor of the room comprising

a. a door leaf;

b. a floor;

c. an opening below floor level directly under said door leaf and outside of the access aperature;

d. a door frame having a top portion located at the borders of the access aperature, the door frame having a bottom portion disposed in said opening below floor level;

e. slidable hinging means attached to one side of said door leaf and said door frame, said slidable hinging means allowing vertical movement of said door leaf relative to said door frame while allowing said door leaf to pivot relative to said door frame;

f. retaining means for retaining said door leaf in a first position above said opening below floor level when said door leaf is in a closed position relative to the access aperature;

g. energizing means for overcoming said retaining means and sliding said door leaf vertically relative to said door frame to a second position so as to partially dispose said door leaf in said opening below floor level and align the borders of said door leaf with the top and bottom portion of said door frame;

h. locking means which simultaneously locks said door leaf in a fixed position relative to said door frame as said door leaf is lowered to in the second position partially disposed in said opening below floor level, said locking means including top locking means which locks the top of said door leaf and said door frame, said locking means including first side locking means for locking the side of said door leaf having said slidable hinge means, said first side locking means independent of said slidable hinge means and includes pin means attached to said door frame and adapted to be received by first slot means attached to said door leaf, said locking means further including second side locking means, said second side locking means including cam roller means fixed to said door frame and second slot means adapted to receive said cam roller means and lock the side of said door leaf opposite said slidable hinge means in a fixed position relative to said door frame when said door leaf is in said second position.

7. The apparatus of claim 6 which includes holding means adjacent said door leaf and said door frame for maintaining said door leaf and said door frame in sealing contract.

8. The apparatus of claim 7 wherein said holding means extends around the borders of said door leaf and said door frame.

9. The apparatus of claim 6 wherein said top locking means includes bracket means attached to said door leaf and slot means in said door frame adapted to receive said brackets when said door leaf is in said second position.

10. The apparatus of claim 6 wherein said energizing means is an air cylinder.

11. A sealing system to prevent RF radiation leakage into or from a room having an access aperature extending to the floor of the room comprising

a. a door leaf;

b. a floor;

c. an opening below floor level directly under said door leaf and outside of the access aperature;

d. a door frame having a top portion located at the borders of the access aperature, the door frame having a bottom portion disposed in said opening below floor level;

e. slidable hinging means attached to said door leaf and said door frame, said slidable hinging means allowing vertical movement of said door leaf relative to said door frame while allowing said door leaf to pivot relative to said door frame;

f. retaining means for retaining said door leaf in a first position above said opening below floor level when said door leaf is in a closed position relative to the access aperature;

g. energizing means for overcoming said retaining means and sliding said door leaf vertically relative to said door frame to a second position so as to partially dispose said door leaf in said opening below floor level and align the borders of said door leaf with the top and bottom portion of said door frame.

h. locking means which locks said door leaf in a fixed position relative to said door frame as said door leaf is lowered to the second position partially disposed in said opening below floor level, said locking means including first side locking means for locking the side of said door leaf having said slidable hinge means, said first side locking means including pin means attached to said door frame and adapted to be received by first slot means attached to said door leaf.

12. The apparatus of claim 11 in which said locking means further includes second side locking means, said second side locking means including cam roller means fixed to said door frame and second slot means adapted to receive said cam roller means and lock the side of said door leaf opposite said slidable hinge means in a fixed position relative to said door frame when said door leaf is in said second position.

13. The apparatus of claim 12 which includes holding means adjacent said door leaf and said door frame for maintaining said door leaf and said door frame in contrast.

14. The apparatus of claim 13 wherein said holding means extends around the borders of said door leaf and said door frame.

15. The apparatus of claim 14 wherein said energizing means is an air cylinder.