A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A security apparatus for a doorway includes a plate having a plurality of receiving holes and a plurality of fastening holes. One side of the plate has a formed portion which is bent to be off plane with the plane defined by the remainder of the plate. The receiving holes may be of different sizes to accommodate different bolts. The fastening holes may include one or more groups of fastening holes. In one example the plate has three groups of fastening holes that may be off center from the plate's centerline. The groups may be positioned away from the centerline either toward or away from the formed portion. At least one group is staggered compared to at least one other group. And, at least one group has a spacing between adjacent holes that is greater than the spacing of at least one other group. At least one receiving hole may have one or more filleted corners.
A security apparatus for a doorway includes a plate having a plurality of receiving holes and a plurality of fastening holes. One side of the plate has a formed portion which is bent to be off plane with the plane defined by the remainder of the plate. The receiving holes may be of different sizes to accommodate different bolts. The fastening holes may include one or more groups of fastening holes. In one example the plate has three groups of fastening holes that may be off center from the plate's centerline. The groups may be positioned away from the centerline either toward or away from the formed portion. At least one group is staggered compared to at least one other group. And, at least one group has a spacing between adjacent holes that is greater than the spacing of at least one other group. At least one receiving hole may have one or more filleted corners.
Doorway Security Apparatus
FAIRLESS NICHOLAS (author)
2017-11-23
Patent
Electronic Resource
English
IPC:
E05B
LOCKS
,
Schlösser