US4031722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper-proof locking device
Assignee: Michelman Iron Works Corp
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Filing: 1976-06-07
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Granted: 1977-06-28
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Expires: 1996-06-07
Abstract
Abstract A locking device composed of two strips of metal bent into specific configurations to provide a tamper-proof assembly when emplaced on a lidded container. One strip is fixed to the container by a concealed screw within the container. The other strip overlies the lid and includes a portion superposed over a portion of the one strip. The aforesaid portions of the strips are provided with registered holes through which the shackle of a padlock is threaded to lock the assemblage in place and prevent the opening of the lid. The invention is applicable for locking any lidded boxes or containers, e.g. electric meter wiring cabinets, to prevent the tampering with elements within the box such as service wires interposing an electric meter between power lines and house lines.
Inventors
- 👤 Lionel S. Michelman
- 👤 Samuel M. Michelman
- 👤 David L. Michelman
- 👤 Milton Michelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:44
CPC Classifications
E; E05; E05B; E05B65/00; E05B65/0089; E05B67/00; E05B67/38; E05B67/383; Y; Y10; Y10S; Y10S292/00; Y10S292/11; Y10S70/00; Y10S70/34; Y10T; Y10T292/00; Y10T292/20; Y10T292/228; Y10T292/31; Y10T292/314; Y10T292/319; Y10T292/34; Y10T70/00; Y10T70/40; Y10T70/413; Y10T70/487; Y10T70/493; Y10T70/50; Y10T70/5009; Y10T70/5031; Y10T70/5093; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7661; Y10T70/7915; Y10T70/7921
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
356 words
A tamper-proof locking device mountable on a lidded container or the like comprising a first member and a second member, said first member comprising a generally zig-zag strip having three substantially right-angled bends, so that said first member is divided into four sections, with none of said sections being directly opposite to another section, an inner one of said sections being provided with at least one opening, said second member comprising a strip having a generally U-shaped section and a projecting section, said U-shaped section having a first leg and a second leg, said projecting section extending laterally outwards from and substantially perpendicular to the lower end of the first leg of said U-shaped section and being provided with at least one opening, the second leg of said U-shaped section being provided with a threaded bore, and screw means extending through the bore in said second leg, so that the locking device is mountable on a lidded container by placing the U-shaped section of the second member on a wall of a container with said legs straddling said wall and with said second leg and said screw means within the container, turning said screw means until the tip of said screw means contacts and presses against the wall of the container, closing the lid of the container so that the edge of the lid rests on the base of said U-shaped section, and mounting said first member on both the edge of the lid and the projecting section of the second member with one end section of the first member extending over the edge of the lid, one inner section of the first member overlying the first leg of the U-shaped section, the other inner section of the first member overlying the projecting member and the other end section of the first member extending over the tip of the projecting section of the second member, so that said members are attachable to each other by lock means having a shackle extending through the opening in said inner one of said sections of said first member and the opening in said projecting section of said second member.
Claim 2
Dependent Claim
356 words
A tamper-proof locking device mountable on a lidded container or the like comprising a first member and a second member, said first member comprising a generally zig-zag strip having three substantially right-angled bends, so that said first member is divided into four sections, with none of said sections being directly opposite to another section, an inner one of said sections being provided with at least one opening, said second member comprising a strip having a generally U-shaped section and a projecting section, said U-shaped section having a first leg and a second leg, said projecting section extending laterally outwards from and substantially perpendicular to the lower end of the first leg of said U-shaped section and being provided with at least one opening, the second leg of said U-shaped section being provided with a threaded bore, and screw means extending through the bore in said second leg, so that the locking device is mountable on a lidded container by placing the U-shaped section of the second member on a wall of a container with said legs straddling said wall and with said second leg and said screw means within the container, turning said screw means until the tip of said screw means contacts and presses against the wall of the container, closing the lid of the container so that the edge of the lid rests on the base of said U-shaped section, and mounting said first member on both the edge of the lid and the projecting section of the second member with one end section of the first member extending over the edge of the lid, one inner section of the first member overlying the first leg of the U-shaped section, the other inner section of the first member overlying the projecting member and the other end section of the first member extending over the tip of the projecting section of the second member, so that said members are attachable to each other by lock means having a shackle extending through the opening in said inner one of said sections of said first member and the opening in said projecting section of said second member.
Claim 3
Dependent Claim
18 words
The locking device of claim 1 in which both of the members are of substantially the same width.
Claim 4
Dependent Claim
17 words
The locking device of claim 1 in which the first member is thicker than the second member.
Claim 5
Dependent Claim
17 words
The locking device of claim 1 in which both of the members are composed of a metal.
Claim 6
Dependent Claim
24 words
The locking device of claim 4 in which the metal is a steel selected from the group consisting of mild steel and case-hardened steel.
Claim 7
Dependent Claim
32 words
The locking device of claim 1 in which the U-shaped section of the second member is provided with a generally planar base perpendicular to the legs, whereby the legs are spaced apart.
Claim 8
Dependent Claim
21 words
The locking device of claim 1 in which the projecting section of the second member is thicker than the U-shaped section.
Claim 9
Dependent Claim
32 words
The locking device of claim 7 in which the projecting section is a retroverted section of the strip, the folded section being folded away from the U-shaped section of the second member.
Claim 10
Dependent Claim
32 words
The locking device of claim 7 in which an apertured plate is secured to the projecting section of the second member, said plate covering substantially the entire surface of the projecting section.
Claim 11
Dependent Claim
31 words
The locking device of claim 9 in which the second member and the plate are composed of metal and the plate is welded to the projecting section of the second member.
Claim 12
Dependent Claim
15 words
The locking device of claim 1 in which the lock means is a barrel lock.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |