Patent US3698679A successfully refreshed from Google Patents.
US3698679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-automatic restraint mechanism
Assignee: Boeing Co
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Filing: 1970-12-11
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Granted: 1972-10-17
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Expires: 1990-12-11
Abstract
Abstract A mechanism which will allow passage of an object approaching the mechanism from a first direction but will prevent passage of an object approaching from the opposite direction. A lip member is mounted on a spring biased carrier beam which is pivotally supported on the base of the mechanism and held by releasable holding means in position to extend the lip member into the path of the object. An object which impacts the lip member from the first direction will cause the lip member to actuate a release means to allow rotation of the carrier beam away from the object. The spring biasing of the carrier beam maintains the lip member in contact with the near surface of the object, and causes the lip to return to its original position when the object moves past the mechanism. Impact loads imparted to the lip member from the opposite direction are rigidly resisted by the lip member, the carrier beam member and the holding means. The preferred embodiment involves an aircraft cargo deck mechanism which is specifically designed to be installed in a limited space envelope near the cargo door to allow movement of cargo into the aircraft but to prevent inadvertent movement back through the door. Other features of the preferred embodiment include a self-locking tiedown clamp, and a manually actuated lever for releasing the clamp and for locking the mechanism in an inoperative position below the level of the deck during unloading operations.
Inventors
- 👤 John M Lang
- 👤 Robert D Trautman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:29
CPC Classifications
B; B64; B64D; B64D9/00; B64D9/003
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
297 words
A mechanism of the type described which will allow movement of an object approaching the mechanism from a first direction but will prevent movement of an object approaching the mechanism from a second direction opposite to said first direction comprising: a base adapted for attachment to supporting structure; a carrier mEmber mounted on a pivot on said base member; a lip member rotatably mounted on said carrier member at a distance spaced apart from said pivot; stop means located on each of said carrier and lip members for establishing an upstanding limit position for said lip member and for preventing any rotary movement of said lip member past said upstanding limit position; spring means acting between said carrier and lip members and urging said lip member into said limit position; holding means for preventing rotary movement of said carrier member about said pivot; release means responsive to movement of said lip member for releasing said holding means when an object moving in said first direction comes into physical contact with said lip member, to thereby release said carrier member for rotary movement about said pivot on said base member; wherein when said mechanism is preset in an operative position, the mechanism will dispose said lip member in the path of objects moving past said mechanism; and wherein an object approaching from said first direction will impact and move said lip member away from said limit position, thereby actuating said release means to allow rotary movement of said carrier member and said lip member away from the path of said object; and wherein an object approaching from said second direction will be prevented from moving past said mechanism by reaction loads developed within said lip member, said stop means, said carrier member, said holding means, and said base.
Claim 2
Dependent Claim
297 words
A mechanism of the type described which will allow movement of an object approaching the mechanism from a first direction but will prevent movement of an object approaching the mechanism from a second direction opposite to said first direction comprising: a base adapted for attachment to supporting structure; a carrier mEmber mounted on a pivot on said base member; a lip member rotatably mounted on said carrier member at a distance spaced apart from said pivot; stop means located on each of said carrier and lip members for establishing an upstanding limit position for said lip member and for preventing any rotary movement of said lip member past said upstanding limit position; spring means acting between said carrier and lip members and urging said lip member into said limit position; holding means for preventing rotary movement of said carrier member about said pivot; release means responsive to movement of said lip member for releasing said holding means when an object moving in said first direction comes into physical contact with said lip member, to thereby release said carrier member for rotary movement about said pivot on said base member; wherein when said mechanism is preset in an operative position, the mechanism will dispose said lip member in the path of objects moving past said mechanism; and wherein an object approaching from said first direction will impact and move said lip member away from said limit position, thereby actuating said release means to allow rotary movement of said carrier member and said lip member away from the path of said object; and wherein an object approaching from said second direction will be prevented from moving past said mechanism by reaction loads developed within said lip member, said stop means, said carrier member, said holding means, and said base.
Claim 3
Dependent Claim
40 words
A mechanism according to claim 1 which includes means for locking said mechanism in an inoperative position wherein said lip member is locked and held in a position which is out of the path of objects moving past said mechanism.
Claim 4
Dependent Claim
41 words
A mechanism according to claim 2 wherein, when said mechanism is locked in said inoperative position an axial force applied to the lip member will be effective to release said mechanism from said inoperative position and back into an operative position.
Claim 5
Dependent Claim
73 words
A mechanism according to claim 2 wherein said means for locking said mechanism includes a lever element pivotally mounted on said base and disposed in a position suitable for manual actuation, a cam element operably connected to said lever element and having a recessed detent, and a pin member connected to said carrier member and disposed for positive locking engagement in said detent surface when said lever member is rotated a predetermined amount.
Claim 6
Dependent Claim
65 words
A mechanism according to claim 1 wherein said holding means comprises an upper toggle link pivotally attached to said carrier member, and a lower toggle link pivotally attached at opposite ends thereof to said upper toggle link and said base member respectively, stop means to limit rotational movement of said toggle link, and spring means for urging said lower toggle link against said stop means.
Claim 7
Dependent Claim
59 words
A mechanism according to claim 5 wherein said lip member and said upper toggle link are provided with interengaging surfaces for rotation of said upper toggle link upon rotation of said lip member by an object moving in said first direction to thereby release said toggle mechanism and allow it to collapse to allow movement of said carrier beam.
Claim 8
Dependent Claim
52 words
A mechanism according to claim 1 which additionally includes a tiedown clamp pivotally mounted on said base member, and pawl and detent means actuatable by rotation of said tiedown clamp for locking said tiedown clamp in a position to react vertical loads from an object stowed in close proximity to said mechanism.
Claim 9
Dependent Claim
31 words
A mechanism according to claim 7 which includes a lever member pivotally mounted on said base and wherein said pawl and detent means are released by rotation of said lever member.
Claim 10
Dependent Claim
62 words
A mechanism according to claim 5 wherein said lever element is provided with a surface for engagement with the pivot connection between said upper and lower toggle members to displace the pivot past a center position defined by a line between the pivotal attachments of said toggle members to said base and to said caRrier members to thereby collapse said toggle mechanism.
Claim 11
Dependent Claim
39 words
A mechanism according to claim 9 which includes a pin attached to said carrier member and wherein said cam is provided with a second surface for engagement with said pin to rotate said carrier member about said first pivot.
Claim 12
Dependent Claim
36 words
A mechanism according to claim 1 wherein said lip member is provided with a roller arranged to extend beyond said lip member to provide a rolling contact with objects approaching said mechanism from said first direction.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |