Patent US4492430A successfully refreshed from Google Patents.
US4492430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security mirror replaceable from pipe chase
Assignee: Acorn Engineering Co
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Filing: 1983-01-05
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Granted: 1985-01-08
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Expires: 2003-01-05
Abstract
Abstract A vandal-resistant and tamper-proof security mirror assembly. The mirror is particularly useful for installation in a prison cell and is not removable from the viewing side thereof but is removable and replaceable from the back of the mounting surface such as from a pipe chase. The mirror assembly is held in a pan which is held behind an opening of the mounting surface.
Inventors
- 👤 Earl L. Morris
- 👤 V. Walter Hafner
- 👤 Ron T. Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:02
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/18; G02B7/182; A; A47; A47G; A47G1/00; A47G1/02; A47G1/16; A47G1/20; A47G1/21; A47G1/215; A47K; A47K1/00; A47K1/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
215 words
A vandal-resistant and tamper-proof security mirror assembly with fasteners which are not removable from the viewing side thereof but which are removable and replaceable from the back side of the mounting surface, said mirror assembly comprising: a mounting plate, having a viewing side and back side, securely affixed over an access hole in a wall, said mounting plate having an opening therein; fastening means affixed to the mounting plate along the opening therein, said fastening means extending away from the back side thereof, said fastening means being removable from the back side of the mounting plate; pan means held by said fastening means over the opening in the mounting plate and against the back side thereof, said pan means extending past the edges of the opening along the entire periphery of the opening and said pan means having a side wall extending completely therearound, the inner edge of the side wall abutting the back surface of the mounting plate at a location further away from the opening than the fastening means; and a mirror and back laminate having a backing layer adjacent the pan means and a reflective layer held against the back side of the opening in the mounting plate, said mirror and backing laminate extending beyond said opening around the entire periphery thereof.
Claim 2
Dependent Claim
215 words
A vandal-resistant and tamper-proof security mirror assembly with fasteners which are not removable from the viewing side thereof but which are removable and replaceable from the back side of the mounting surface, said mirror assembly comprising: a mounting plate, having a viewing side and back side, securely affixed over an access hole in a wall, said mounting plate having an opening therein; fastening means affixed to the mounting plate along the opening therein, said fastening means extending away from the back side thereof, said fastening means being removable from the back side of the mounting plate; pan means held by said fastening means over the opening in the mounting plate and against the back side thereof, said pan means extending past the edges of the opening along the entire periphery of the opening and said pan means having a side wall extending completely therearound, the inner edge of the side wall abutting the back surface of the mounting plate at a location further away from the opening than the fastening means; and a mirror and back laminate having a backing layer adjacent the pan means and a reflective layer held against the back side of the opening in the mounting plate, said mirror and backing laminate extending beyond said opening around the entire periphery thereof.
Claim 3
Dependent Claim
26 words
The security mirror assembly of claim 1 wherein said fastening means comprises a plurality of carriage bolts held in a non-turning relationship in the mounting plate.
Claim 4
Dependent Claim
50 words
The security mirror assembly of claim 2 wherein each carriage bolt is held to the mounting plate by a nut having a bearing surface abutting the back surface of the mounting plate, said nut being located between the side wall of the pan and the opening in the mounting surface.
Claim 5
Dependent Claim
24 words
The security mirror assembly of claim 3 wherein the nuts holding the carriage bolts position the mirror and back laminate within the pan means.
Claim 6
Dependent Claim
73 words
The security mirror assembly of claim 1 wherein said fastening means are held to said mounting plate by spacer nut means held against the back side of the mounting plate, said spacer nut means being of a thickness slightly less than the distance between the back of the mounting plate and the inside surface of the pan means whereby over tightening of the pan means against the mirror and back laminate is prevented.
Claim 7
Dependent Claim
35 words
The security mirror assembly of claim 5 wherein said fastening means comprises a plurality of carriage bolts and said spacer nut means has a recess to accept a square shank portion of said carriage bolts.
Claim 8
Dependent Claim
23 words
The security mirror assembly of claim 1 further including at least one channel member held against the back surface of the pan means.
Claim 9
Dependent Claim
13 words
The security mirror assembly of claim 7 wherein there are three channel members.
Claim 10
Dependent Claim
16 words
The security mirror assembly of claim 1 wherein said reflective layer is fabricated from tempered glass.
Claim 11
Dependent Claim
16 words
The security mirror assembly of claim 1 wherein said reflective layer is fabricated from stainless steel.
Claim 12
Dependent Claim
27 words
The security mirror assembly of claim 1 wherein said mirror and reflective laminate extends past the opening in the mounting plate by at least about 3/8th inch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |