Patent US3591219A successfully refreshed from Google Patents.
US3591219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety door lock
Assignee: Individual
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Filing: 1969-07-18
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Granted: 1971-07-06
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Expires: 1989-07-18
Abstract
Abstract A tamperproof safety lock for securing a doorway is provided. The latch is pivotally mounted at one end to a plate which is secured to the inside surface of the door adjacent to the edge. A second plate is mounted on the door molding in alignment with the first plate. The distance between the two plates when the door is closed is such that the latch may pivot to bridge the gap between the two plates. The second plate includes a grooved latch stop. The groove within the latch stop is of a thickness greater than the thickness of the latch and receives the latch when it is pivoted to the locked position. The latch includes an opening adjacent the free end thereof in alignment with the latch stop. A portion of the latch stop is bored and receives a spring biased locking bolt which may be manually operated to extend into the groove and through the opening in the latch. The bolt thus prevents the latch from being rotated to the ''''open'''' position.
Inventors
- 👤 Michael Graziosi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:21
CPC Classifications
E; E05; E05C; E05C3/00; E05C3/02; E05C3/04; E05C3/041; E05C3/044; E05B; E05B17/00; E05B17/20; E05B17/2007; E05B17/203; E05B17/2038; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1075; Y10T292/1083; Y10T292/1089; Y10T292/68; Y10T292/696
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
239 words
A keyless tamperproof safety lock for securing a portal and serving to prevent unauthorized entrance through the portal, said lock comprising a latch pivotably mounted on a first surface, said first surface being mounted on a latch plate, a latch stop mounted on a second surface, said second surface being mounted on a supporting plate, said latch stop and second surface being of unitary construction and forming a generally T-shaped structure lying on its side, said latch stop and second surface remaining stationary relative to said first surface when said portal is opened, said latch being engageable in a slot formed at the junction of said latch stop and said second surface, the width of said slot being greater than the thickness of said latch, a portion of said latch being received within said slot when the latch is rotated to the locked position, the latch stop having a spring-actuated bolt moveable in a direction substantially perpendicular to the plane of said second surface, a bore in said second surface and said supporting plate in alignment with said movable bolt, means forming an opening in said latch, the bolt being engageable with the latch through said opening when the latch is in its locked position and said bolt engaging said bore through said second surface and said supporting plate thereby preventing the rotation of the latch to disengage the slot without the disengagement of the bolt through the opening.
Claim 2
Dependent Claim
239 words
A keyless tamperproof safety lock for securing a portal and serving to prevent unauthorized entrance through the portal, said lock comprising a latch pivotably mounted on a first surface, said first surface being mounted on a latch plate, a latch stop mounted on a second surface, said second surface being mounted on a supporting plate, said latch stop and second surface being of unitary construction and forming a generally T-shaped structure lying on its side, said latch stop and second surface remaining stationary relative to said first surface when said portal is opened, said latch being engageable in a slot formed at the junction of said latch stop and said second surface, the width of said slot being greater than the thickness of said latch, a portion of said latch being received within said slot when the latch is rotated to the locked position, the latch stop having a spring-actuated bolt moveable in a direction substantially perpendicular to the plane of said second surface, a bore in said second surface and said supporting plate in alignment with said movable bolt, means forming an opening in said latch, the bolt being engageable with the latch through said opening when the latch is in its locked position and said bolt engaging said bore through said second surface and said supporting plate thereby preventing the rotation of the latch to disengage the slot without the disengagement of the bolt through the opening.
Claim 3
Dependent Claim
94 words
A keyless tamperproof safety lock constructed in accordance with claim 1 wherein the bolt is substantially cylindrical and is formed of two cylindrical sections, one of said sections being of a larger diameter than the other, a shoulder formed at the juncture between the sections, the spring is a heLical coil spring, the spring being positioned over the cylindrical section having the smaller diameter, one end of the spring abutting the shoulder, the other end of the spring abutting an end of the bore to urge the portion of the bolt into the slot.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |