Patent US4531769A successfully refreshed from Google Patents.
US4531769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hook latch for an engine cowling
Assignee: Boeing Co
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Filing: 1982-08-25
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Granted: 1985-07-30
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Expires: 2002-08-25
Abstract
Abstract An improved latch for securing together a pair of hinged cowlings surrounding an aircraft engine. The latch is characterized by having a safety lock for engaging a hook when the latch is in a locked or latched position and also for engaging the hook when the hook has been disengaged from a latch keeper thereby allowing the operator of the latch to engage and disengage the cowlings using only one hand.
Inventors
- 👤 Jerry L. Glancy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:29
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/10; E05C19/12; E05C19/14; B; B64; B64D; B64D29/00; B64D29/06; Y; Y10; Y10S; Y10S292/00; Y10S292/31; Y10S292/49; Y10T; Y10T292/00; Y10T292/08; Y10T292/0911; Y10T292/0913; Y10T292/0914; Y10T292/0917
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
An improved latch for securing together a pair of hinged cowlings surrounding an aircraft engine, the latch comprising: a latch keeper secured to one of the hinged cowlings; a hook release handle pivotally mounted on the other hinged cowling; a hook pivotally mounted on the hook release handle; and a safety lock attached to the handle, the safety lock having a first securing means for engaging and securing the latch when the latch is in a locked position and a second securing means for engaging and securing the handle to the hook when the hook is unlatched from the keeper.
Claim 2
Dependent Claim
100 words
An improved latch for securing together a pair of hinged cowlings surrounding an aircraft engine, the latch comprising: a latch keeper secured to one of the hinged cowlings; a hook release handle pivotally mounted on the other hinged cowling; a hook pivotally mounted on the hook release handle; and a safety lock attached to the handle, the safety lock having a first securing means for engaging and securing the latch when the latch is in a locked position and a second securing means for engaging and securing the handle to the hook when the hook is unlatched from the keeper.
Claim 3
Dependent Claim
44 words
The latch as described in claim 1 wherein the first securing means is a first slot in one end of the safety lock for receipt around a pin on the hook when the hook engages the keeper securing the latch in a locked position.
Claim 4
Dependent Claim
46 words
The latch as described in claim 1 wherein the second securing means is a second slot in one end of the safety lock for receipt around a pin on the hook for securing the handle to the hook when the hook is unlatched from the keeper.
Claim 5
Dependent Claim
39 words
The latch as described in claim 1 wherein the safety lock is spring biased for engaging the hook when the latch is in a locked position and for engaging the hook when the hook is unlatched from the keeper.
Claim 6
Dependent Claim
26 words
The latch as described in claim 1 wherein the hook release handle is mounted on a hook pivot pin attached to one end of the hook.
Claim 7
Dependent Claim
130 words
An improved latch for securing together a pair of hinged cowlings surrounding an aircraft engine, the latch comprising: a latch keeper secured to one of the hinged cowlings; a hook pivotally mounted on a hook pivot pin; a hook release handle pivotally attached to the hook pivot pin and mounted on a latch mounting bolt, the bolt secured to the other hinged cowlings; and a safety lock attached to the handle, one end of the lock having a first slot and a second slot, the first slot received around a pin on the hook for securing the latch in a locked position, the second slot received around the pin on the hook for securing the handle to the hook when the hook is in an unlatched position from the keeper.
Claim 8
Dependent Claim
130 words
An improved latch for securing together a pair of hinged cowlings surrounding an aircraft engine, the latch comprising: a latch keeper secured to one of the hinged cowlings; a hook pivotally mounted on a hook pivot pin; a hook release handle pivotally attached to the hook pivot pin and mounted on a latch mounting bolt, the bolt secured to the other hinged cowlings; and a safety lock attached to the handle, one end of the lock having a first slot and a second slot, the first slot received around a pin on the hook for securing the latch in a locked position, the second slot received around the pin on the hook for securing the handle to the hook when the hook is in an unlatched position from the keeper.
Claim 9
Dependent Claim
84 words
The latch as described in claim 6 wherein the safety lock is spring biased for urging the end of the lock having the first slot and second slot therein toward the pin mounted on the hook, by moving the other end of the safety lock inwardly the safety lock is disengaged from the pin on the hook when it is desired to unlatch the hook from the latch keeper or release the handle from the hook when the hook is disengaged from the keeper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |