US3733649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper proof door butt hinge assembly
Assignee: Individual
•
Filing: 1971-08-11
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Granted: 1973-05-22
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Expires: 1991-08-11
Abstract
Abstract This hinge plate assembly is generally of standard construction except that it has been provided with additional formations of the hinge parts and an added hinge pin keeper to prevent the extraction of the hinge pin when the door is closed with its hinged edge in the door jamb. The keeper is formed of flat spring metal and is fixed to the surface of one of the hinge plate and extends laterally through a slot in its bearing portion for engagement with a flattened shouldered recess on the side face of the hinge pin to thereby lock the hinge pin in place against axial displacement from the assembly when the door is closed. In order to keep access to the projection of the keeper when the door is closed and the bearing portions thereof extend into the room space, the keeper is shouldered or widened to overlie the edges of the bearing portion slot into which the keeper extends. Further to prevent access of a tool to the bearing portion to unroll the bearing portion and relieve the keeper projection there is provided a gap-closure on the other of the hinge plates.
Inventors
- 👤 Ch Nagy
- 👤 J Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:50
CPC Classifications
E; E05; E05D; E05D11/00; E05D11/0018; E05D7/00; E05D7/10; E05D7/1005; E05D7/1016; E05D5/00; E05D5/10; E05D5/12; E05D5/128; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
A tamper proof door butt hinge assembly comprising two hinge plates adapted for assembly respectively upon the inner edge of a door and upon the door jamb and to overlie one another with the door being closed upon the jamb, each of said plates having bearing portions adapted when the hinge plates are abutted with one another to be axially aligned with the bearing portions of one plate with the other, a hinge pin axially extendable through the aligned bearing portions to hold the hinge plates in assembled relationship, said hinge pin being relieved to provide locking shoulder means, one of the bearing portions of one of the plates being slotted longitudinally thereof and a hinge pin keeper adapted to be fixed to the hinge plate to overlie the same in a flush manner and having a tab portion extendable through bearing slot and into the shoulder relief in the hinge pin, said keeper being inaccessible upon the door being closed within the door opening or jamb.
Claim 2
Dependent Claim
167 words
A tamper proof door butt hinge assembly comprising two hinge plates adapted for assembly respectively upon the inner edge of a door and upon the door jamb and to overlie one another with the door being closed upon the jamb, each of said plates having bearing portions adapted when the hinge plates are abutted with one another to be axially aligned with the bearing portions of one plate with the other, a hinge pin axially extendable through the aligned bearing portions to hold the hinge plates in assembled relationship, said hinge pin being relieved to provide locking shoulder means, one of the bearing portions of one of the plates being slotted longitudinally thereof and a hinge pin keeper adapted to be fixed to the hinge plate to overlie the same in a flush manner and having a tab portion extendable through bearing slot and into the shoulder relief in the hinge pin, said keeper being inaccessible upon the door being closed within the door opening or jamb.
Claim 3
Dependent Claim
66 words
A tamper proof door butt hinge assembly as defined in claim 1 and said hinge pin keeper being formed of flat metal and having a widened portion providing shoulders outwardly of the ends of the projection of the keeper into the bearing slot and shouldered relief in the hinge pin whereby acess to the ends of the keeper slot will be prevented by a pointed tool.
Claim 4
Dependent Claim
69 words
A tamper proof door butt hinge assembly as defined in claim 2, and said hinge pin keeper having a depressed countersunk portion for receiving a flat headed screw and said one hinge plate having an oversized hole for receiving the screw and the countersunk portion of the keeper so that the keeper can be locked by the screw with the wood in the edge of the door or jamb.
Claim 5
Dependent Claim
104 words
A tamper proof door butt hinge assembly as defined in claim 1 and the other of said door hinge plates having a gap-closing tab projecting from the inner edge of the hinge plate into the space between spaced bearing portions thereof and extendable into close proximity to the surface of the bearing portion of the one plate and adapted to overlie the projection of the hinge pin keeper when the hinge plates overlie one another and the door is closed upon the door jamb so that access of a prying tool to the keeper projection is prohibited and unrolling of the bearing portion prevented.
Claim 6
Dependent Claim
56 words
A tamper proof door butt hinge assembly as defined in claim 4 and said gap-closer tab being depressed so that its edge lines up tangentially with the outer surface of the bearing portion to permit the edge to be in closest proximity with the curved other surface of the bearing portion of the one hinge plate.
Claim 7
Dependent Claim
36 words
A tamper proof door butt hinge assembly as defined in claim 5 and said depressed gap closing tab being relieved at its side edges of material slightly to permit the depression of the gap closer tab.
Claim 8
Dependent Claim
45 words
A tamper proof door butt hinge assembly as defined in claim 3 and said hinge pin keeper being formed of flat spring material and said projection of the keeper being spring bent into the keeper slot of the bearing portion of the one hinge plate.
Claim 9
Dependent Claim
48 words
A tamper proof door butt hinge assembly as defined in claim 7 and said shoulder area on the hinge pin being formed of a flat transverse cut on the exterior of the pin and providing lock shoulders at the opposite axial ends of the flat cutaway slot thereof.
References Cited (Backward Citations)
US2719322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |