US3650554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper proof locking mechanism
Assignee: Individual
•
Filing: 1970-12-09
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Granted: 1972-03-21
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Expires: 1990-12-09
Abstract
Abstract A push-pull shaft having an end of each of two links mounted thereon and separated from each other by a spring, the other end of one of the links being pivotally attached to a door latch, the other end of the door latch being keyed to a rotatable shaft, and the other end of the other link forming a latch return dog that kicks open the door when the push-pull shaft is moved to remove the door latch from the recess of the door and press the spring against the link or latch return dog which is rotatably mounted on the rotatable shaft.
Inventors
- 👤 Emery C Tharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:52
CPC Classifications
E; E05; E05C; E05C9/00; E05C9/06; E05C9/063; Y; Y10; Y10S; Y10S292/00; Y10S292/72; Y10T; Y10T292/00; Y10T292/08; Y10T292/0911; Y10T292/0926; Y10T292/0928; Y10T292/0933
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
229 words
A tamper proof locking mechanism, comprising a door having a vertical recess in the end vertical face thereof, a door frame having a vertical slot therein aligned with an adjacent said recess when the door is in the closed state and having a vertical slot along the door stop portion thereof, a rotatable vertical shaft mounted within said door frame, a horizontal rod slidably mounted within said door frame for movement transverse with the plane of the door when in its closed position, first means connected between said shaft and said rod, second means connected between said shaft and said rod, a portion of said first means insertable within said first-mentioned slot and said recess and positioned therein when the door is in its locked state, a portion of said second means adjacent the second-mentioned slot, and third means connected between said first means and said second means, said rod causing said portion of said first means to be pulled out of said recess in said first mentioned slot, said third means forcing said portion of said second means into said second mentioned slot kicking the door open when said rod is moved in the direction going from said first means to said second means, said second means and said third means automatically forcing said portion of said first means into said recess upon the closing of the door.
Claim 2
Dependent Claim
229 words
A tamper proof locking mechanism, comprising a door having a vertical recess in the end vertical face thereof, a door frame having a vertical slot therein aligned with an adjacent said recess when the door is in the closed state and having a vertical slot along the door stop portion thereof, a rotatable vertical shaft mounted within said door frame, a horizontal rod slidably mounted within said door frame for movement transverse with the plane of the door when in its closed position, first means connected between said shaft and said rod, second means connected between said shaft and said rod, a portion of said first means insertable within said first-mentioned slot and said recess and positioned therein when the door is in its locked state, a portion of said second means adjacent the second-mentioned slot, and third means connected between said first means and said second means, said rod causing said portion of said first means to be pulled out of said recess in said first mentioned slot, said third means forcing said portion of said second means into said second mentioned slot kicking the door open when said rod is moved in the direction going from said first means to said second means, said second means and said third means automatically forcing said portion of said first means into said recess upon the closing of the door.
Claim 3
Dependent Claim
56 words
The mechanism of claim 1, wherein said first means includes linkage pivotally connected to said portion of said first means and slidably and pivotally connected to said rod preventing a wedge slipped in between said door frame and the end face of the door from forcing said portion of said first means out of said recess.
Claim 4
Dependent Claim
20 words
The mechanism of claim 2, wherein said first means is fixedly secured to said shaft for rotation and locking therewith.
Claim 5
Dependent Claim
77 words
The mechanism of claim 1, wherein said second means is pivotally attached to said shaft and has a hole therethrough of greater diameter than the diameter of said rod, said rod being within said hole, said third means causing said second means to slide along said rod at an angle thereto rather than parallel therewith pivoting said second means about said shaft in order to force said portion of said second means into said second mentioned 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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |