US3788261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking device more particularly for connection between a barge and a pusher tug
Assignee: FINANC IND ATELIERS CHANTIERS
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Filing: 1972-02-10
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Granted: 1974-01-29
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Expires: 1992-02-10
Abstract
Abstract A locking device more particularly for the connection between a barge and tug comprises an interrupted screw and nut assembly.
Inventors
- 👤 J Colin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:40
CPC Classifications
B; B63; B63B; B63B21/00; B63B21/56; B63B21/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
A locking device for connecting a barge and a pusher tug, comprising: two elements adapted to slide longitudinally relatively to one another; a screw on one element and a nut on the other element engaged on said screw, the screwthreads of the screw and of the nut being interrupted in longitudinal bands which are the same width as one another, and separated in pairs by bands of screwthreads of the same width as the interrupting bands; a screwthreaded ring screwed into a tapped bearing surface of the nut-bearing other element, such bearing surface being on the same axis, in the same direction and of the same pitch as the screwthreading of the nut; friction means between the ring and the nut for rotating the nut via the ring; drive means for rotating the ring around its axis, and abutment means to limit the rotation of the nut between one position in which the interrupted screwthreads of the screw and nut are fully engaged and another position in which the interrupted screwthreads of the screw and nut are fully disengaged.
Claim 2
Dependent Claim
179 words
A locking device for connecting a barge and a pusher tug, comprising: two elements adapted to slide longitudinally relatively to one another; a screw on one element and a nut on the other element engaged on said screw, the screwthreads of the screw and of the nut being interrupted in longitudinal bands which are the same width as one another, and separated in pairs by bands of screwthreads of the same width as the interrupting bands; a screwthreaded ring screwed into a tapped bearing surface of the nut-bearing other element, such bearing surface being on the same axis, in the same direction and of the same pitch as the screwthreading of the nut; friction means between the ring and the nut for rotating the nut via the ring; drive means for rotating the ring around its axis, and abutment means to limit the rotation of the nut between one position in which the interrupted screwthreads of the screw and nut are fully engaged and another position in which the interrupted screwthreads of the screw and nut are fully disengaged.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein the drive means comprise a force limiter.
Claim 4
Dependent Claim
96 words
The device of claim 1, also comprising: a detector for checking on the relative position of the nut and screw; means for temporarily reversing the direction of drive means rotation when the detector finds that the nut is near a jamming position on the screw at the start of the locking operation and for cancelling such reversal after the screw has shifted relatively to the nut by a fraction of the pitch so that the nut resumes rotation in the screwing direction; and means for cutting the detector out of circuit until the subsequent locking operation.
Claim 5
Dependent Claim
54 words
The device of claim 3 wherein the temporarily operating means comprise a transient-make relay which is controlled by the detector and which controls a delayed relay, the latter in turn controlling a reversing relay which is connected in the drive means control circuit and which is responsible for the sticking of the delayed relay.
Claim 6
Dependent Claim
62 words
The device of claim 1 wherein means are provided to detect stoppage of the drive means after the starting thereof and to temporarily reverse the direction of drive means rotation so as to move the nut back by a fraction of the pitch, whereafter the nut resumes its rotation in the screwing direction, to prevent jamming of the nut on the screw.
Claim 7
Dependent Claim
50 words
The device of claim 5 wherein the means comprise a short-duration contact relay controlling a first delayed relay, one contact of which is in series with one contact of a drive means stoppage detector and controls a second delayed relay which controls a reverser connected in the drive means circuit.
Claim 8
Dependent Claim
21 words
The device of claim 6 wherein the drive means comprise an electric motor and the stoppage detector is a cuRrent detector.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |