US3601453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety lock for trailer doors
Assignee: Individual
•
Filing: 1969-07-01
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Granted: 1971-08-24
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Expires: 1989-07-01
Abstract
Abstract A lock for the door of a trailer to inhibit pilfering from an unattended trailer, as when one is in ''''piggyback'''' transit by rail or when it is in a yard unattended by a tractor operator without an attached tractor. A power lock for the door is mounted in a position inaccessible from the outside of the trailer and for its operation requires power such as air pressure or 12-volt electricity, which is available from a tractor, to unlock it.
Inventors
- 👤 Seymour Silverman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:59
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/08; B62D53/0857; E; E05; E05B; E05B81/00; E05B81/02; E05B81/10; E05B83/00; E05B83/02; E05B83/12; Y; Y10; Y10S; Y10S292/00; Y10S292/32; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/1014; Y10T292/1021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
A closed compartment for the transportation of freight at times at least on a highway, said compartment including an opening for the removal of the contents of the compartment and a door for closing said opening, power-controlled door-locking means for locking said door against unauthorized opening, said locking means having a locking position inaccessible for manual release from the outside of said compartment and having an alternate unlocking position, power-coupling means on the outside of the compartment for receiving power for the compartment from an external source, and means establishing a path for power from the coupling means to said locking means, said last means including a switch having a first position interrupting the path for power to the locking means and an alternate noninterrupting position to render the power means effective, and spring means constantly urging the switch to its first position whereby the source of power when connected to the coupling means is ineffEctive except while the switch is held in its alternate position against the spring bias.
Claim 2
Dependent Claim
170 words
A closed compartment for the transportation of freight at times at least on a highway, said compartment including an opening for the removal of the contents of the compartment and a door for closing said opening, power-controlled door-locking means for locking said door against unauthorized opening, said locking means having a locking position inaccessible for manual release from the outside of said compartment and having an alternate unlocking position, power-coupling means on the outside of the compartment for receiving power for the compartment from an external source, and means establishing a path for power from the coupling means to said locking means, said last means including a switch having a first position interrupting the path for power to the locking means and an alternate noninterrupting position to render the power means effective, and spring means constantly urging the switch to its first position whereby the source of power when connected to the coupling means is ineffEctive except while the switch is held in its alternate position against the spring bias.
Claim 3
Dependent Claim
59 words
A structure according to claim 1 wherein the structure has road wheels for facilitating transportation on a highway and power brakes controlled by power through the coupling means for braking the rolling of the wheels on the highway, said switch when in its first position rendering the lock release unresponsive to power fluctuations caused by operation of the brakes.
Claim 4
Dependent Claim
19 words
A structure as defined in claim 1 wherein the switch is a pneumatic switch biased to its first position.
Claim 5
Dependent Claim
26 words
A structure as defined in claim 1 wherein there is provided manually operable latching means for releasably holding the door shut independently of said locking means.
Claim 6
Dependent Claim
26 words
A structure as defined in claim 2 wherein there is provided manually operable latching means for releasably holding the door shut independently of said locking means.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |