USRE31935E - Externally accessible adjuster for flush latches - Google Patents

Externally accessible adjuster for flush latches Download PDF

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Publication number
USRE31935E
USRE31935E US06/194,145 US19414580A USRE31935E US RE31935 E USRE31935 E US RE31935E US 19414580 A US19414580 A US 19414580A US RE31935 E USRE31935 E US RE31935E
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United States
Prior art keywords
adjustment wheel
keeper
aircraft
tension
wheel
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US06/194,145
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L. Richard Poe
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Hartwell Corp
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Hartwell Corp
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Priority claimed from US05/882,173 external-priority patent/US4183564A/en
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Priority to US06/194,145 priority Critical patent/USRE31935E/en
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Publication of USRE31935E publication Critical patent/USRE31935E/en
Assigned to MEES PIERSON N.V., NEW YORK AGENCY reassignment MEES PIERSON N.V., NEW YORK AGENCY ASSIGNMENT OF SECURITY INTEREST IN UNITED STATES TRADEMARKS AND PATENTS Assignors: HARTWELL CORPORATION
Assigned to MEESPIERSON CAPITAL CORP., DELAWARE CORPORATION reassignment MEESPIERSON CAPITAL CORP., DELAWARE CORPORATION ASSIGNMENT OF SECURITY INTEREST IN UNITED STATES TRADEMARKS AND PATENTS Assignors: MEES PIERSON, N.V., NEW YORK AGENCY
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Assigned to THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., reassignment THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ACME AEROSPACE, INC., ADAMS RITE AEROSPACE, INC., AEROCONTROLEX GROUP, INC., AEROSONIC LLC (F/K/A AEROSONIC CORPORATION), AIRBORNE HOLDINGS, INC., AIRBORNE SYSTEMS OF NORTH AMERICA OF NJ INC., AMSAFE, INC., ARKWIN INDUSTRIES, INC., AVIONIC INSTRUMENTS LLC, AVIONICS SPECIALTIES, INC., AvtechTyee, Inc., BREEZE-EASTERN LLC (F/K/A BREEZE-EASTERN CORPORATION), BRUCE AEROSPACE, INC., CEF INDUSTRIES, LLC (F/K/A CEF INDUSTRIES, INC.), CHAMPION AEROSPACE LLC, DATA DEVICE CORPORATION, DUKES AEROSPACE, INC., ELECTROMECH TECHNOLOGIES LLC (F/K/A WESTERN SKY, INDUSTRIES, LLC), HARCOSEMCO LLC (F/K/A HARCO LABORATORIES, INCORPORATED) (F/K/A HARCO LLC), HARTWELL CORPORATION, MARATHONNORCO AEROSPACE, INC., PEXCO AEROSPACE, INC., PNEUDRAULICS, INC., SCHNELLER LLC, SEMCO INSTRUMENTS, INC., SHIELD RESTRAINT SYSTEMS, INC. (F/K/A AMSAFE COMMERCIAL PRODUCTS INC.) (F/K/A BEAM'S INDUSTRIES, INC.), TACTAIR FLUID CONTROLS, INC., TEAC AEROSPACE TECHNOLOGIES, INC., TELAIR INTERNATIONAL LLC, TRANSDIGM, INC., TRANSICOIL LLC, WHIPPANY ACTUATION SYSTEMS, LLC, YOUNG & FRANKLIN INC.
Assigned to THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS TRUSTEE AND NOTES COLLATERAL AGENT reassignment THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS TRUSTEE AND NOTES COLLATERAL AGENT PATENT SECURITY AGREEMENT Assignors: ACME AEROSPACE, INC., ADAMS RITE AEROSPACE, INC., AEROCONTROLEX GROUP, INC., AEROSONIC CORPORATION/LLC, AIRBORNE HOLDINGS, INC., AIRBORNE SYSTEMS NORTH AMERICA OF NJ INC., AMSAFE COMMERCIAL PRODUCTS INC., AMSAFE, INC., ARKWIN INDUSTRIES, INC., ARMTEC COUNTERMEASURES CO., ARMTEC DEFENSE PRODUCTS CO., ARMTEC DEFENSE PRODUCTS COMPANY, AVIONIC INSTRUMENTS LLC, AVIONICS SPECIALTIES, INC., AvtechTyee, Inc., BEAM’S INDUSTRIES, BREEZE-EASTERN CORPORATION, BRUCE AEROSPACE, INC., CEF INDUSTRIES, INC., CHAMPION AEROSPACE LLC, DATA DEVICE CORPORATION, DUKES AEROSPACE, INC., ELECTROMECH TECHNOLOGIES LLC, HARCO LABORATORIES, INCORPORATED, HARCO LLC, HARTWELL CORPORATION, KORRY ELECTRONICS CO., LEACH INTERNATIONAL CORPORATION, MARATHONNORCO AEROSPACE, INC., Mason Electric Company, NMC GROUP, INC., PALOMAR PRODUCTS, INC., PEXCO AEROSPACE, INC., PNEUDRAULICS, INC., SCHNELLER LLC, SEMCO INSTRUMENTS, INC., SHIELD RESTRAINT SYSTEMS, INC., TA AEROSPACE CO., TACTAIR FLUID CONTROLS, INC., TEAC AEROSPACE TECHNOLOGIES, INC., TELAIR INTERNATIONAL LLC, TRANSCOIL LLC, TRANSDIGM, INC., WESTERN SKY INDUSTRIES, LLC, WHIPPANY ACTUATION SYSTEMS, LLC, YOUNG & FRANKLIN INC.
Assigned to HARTWELL CORPORATION, TRANSCOIL LLC, TRANSDIGM, INC., MASON ELECTRIC CO., MARATHONNORCO AEROSPACE, INC., DUKES AEROSPACE, INC., PEXCO AEROSPACE, INC., NMC GROUP INC., ARMTEC COUNTERMEASURES CO., TEAC AEROSPACE TECHNOLOGIES, INC., ACME AEROSPACE, INC., AVIONICS SPECIALTIES, INC., TRANSDIGM GROUP INCORPORATED, ARMTEC DEFENSE PRODUCTS COMPANY, PNEUDRAULICS, INC., ELECTROMECH TECHNOLOGIES LLC, AEROCONTROLEX GROUP, INC., ADAMS RITE AEROSPACE, INC., HARCO LABORATORIES, INC., TACTAIR FLUID CONTROLS INC., BREEZE EASTERN CORPORATION, YOUNG & FRANKLIN INC., SCHNELLER LLC, KORRY ELECTRONICS CO., AMSAFE COMMERCIAL PRODUCTS INC., AVTECH TYEE, INC., SEMCO INSTRUMENTS, INC., CHAMPION AEROSPACE LLC, ARKWIN INDUSTRIES, INC., APICAL INDUSTRIES, INC., AIRBORNE SYSTEMS NORTH AMERICA OF NJ INC., LEACH INTERNATIONAL CORPORATION, SIMPLEX MANUFACTURING CO., TA AEROSPACE CO., AMSAFE, INC., TELAIR INTERNATIONAL LLC, DATA DEVICE CORPORATION, AVIONIC INSTRUMENTS LLC, BEAM'S INDUSTRIES, AEROSONIC CORPORATION, SHIELD RESTRAINT SYSTEMS, INC., CHELTON, INC. (N/K/A CHELTON AVIONICS, INC.), PALOMAR PRODUCTS, INC., AIRBORNE HOLDINGS, INC., WESTERN SKY INDUSTRIES, LLC, WHIPPANY ACTUATION SYSTEMS, LLC, HARCO LLC, CEF INDUSTRIES, INC., BRUCE AEROSPACE, INC. reassignment HARTWELL CORPORATION RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS TRUSTEE
Assigned to TRANSICOIL INC., AERO-INSTRUMENTS CO., LLC, CALSPAN AERO SYSTEMS ENGINEERING, INC., ACME AEROSPACE, INC., TELAIR INTERNATIONAL AB, AVIONIC INSTRUMENTS, INC., CORRPRO COMPANIES, INC., AEROSONIC LLC, SOUTHCO, INC., HARCO CORPORATION, TRANSDIGM GROUP INCORPORATED, TEAC AEROSPACE TECHNOLOGIES, INC., TRANSDIGM INC., DUKES AEROSPACE, INC., WHIPPANY ACTUATION SYSTEMS, LLC, TURNTIME TECHNOLOGIES AB, TA AEROSPACE CO., HARCO LABORATORIES, INC., CEF INDUSTRIES, INC., PEXCO AEROSPACE, INC., DATA DEVICE CORPORATION, AIRBORNE SYSTEMS NA, INC., KORRY ELECTRONICS CO., BREEZE-EASTERN LLC, CEF INDUSTRIES, LLC, TELAIR INTERNATIONAL GMBH, SCHNELLER, INC., HARCOSEMCO LLC, CALSPAN SYSTEMS, LLC, JOSLYN SUNBANK COMPANY LLC, PNEUDRAULICS, INC., ROLLS-ROYCE PLC, SEMCO INSTRUMENTS, INC., PURE TECHNOLOGIES LTD., HARCO, LLC (N/K/A HARCOSEMCO LLC), SOURIAU USA, INC., SHIELD RESTRAINT SYSTEMS, INC., MASON ELECTRIC CO., HARTWELL CORPORATION, SCHNELLER LLC, BRUCE AEROSPACE INC., SIMPLEX MANUFACTURING CO., YOUNG & FRANKLIN INC., NMC GROUP, INC., ARKWIN INDUSTRIES, INC., AMSAFE, INC., AvtechTyee, Inc., MEMTRON TECHNOLOGIES CO., ARMTEC COUNTERMEASURES CO., AEROSONIC CORPORATION, ARMTEC DEFENSE PRODUCTS COMPANY, CHELTON, INC. (N/K/A CHELTON AVIONICS, INC.), PALOMAR PRODUCTS, INC., CHAMPION AEROSPACE LLC, HARCO TECHNOLOGIES CORPORATION, TELAIR US LLC, AIRBORNE SYSTEMS NORTH AMERICA OF NJ INC., ADAMS RITE AEROSPACE, INC., MOUNTAINTOP TECHNOLOGIES, INC., TACTAIR FLUID CONTROLS, INC., NORDISK AVIATION PRODUCTS AS, MARATHONNORCO AEROSPACE, INC., LEACH INTERNATIONAL CORPORATION, ADVANCED INPUT DEVICES, INC., APICAL INDUSTRIES, INC., HARCO LLC, AEROCONTROLEX GROUP, INC. reassignment TRANSICOIL INC. RELEASE OF PATENT SECURITY AGREEMENT RECORDED FEBRUARY 19, 2019 AT REEL/FRAME 048365/0499 Assignors: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS TRUSTEE
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
    • E05B15/02—Striking-plates; Keepers; Bolt staples; Escutcheons
    • E05B15/0205—Striking-plates, keepers, staples
    • E05B15/024—Striking-plates, keepers, staples adjustable
    • E05B15/025—Striking-plates, keepers, staples adjustable the striker being movable by a screw/nut
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/08—Bolts
    • Y10T292/087—Loops
    • Y10T292/0871—Sliding and swinging, lever-operating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/08—Bolts
    • Y10T292/0911—Hooked end
    • Y10T292/0913—Sliding and swinging
    • Y10T292/0914—Operating means
    • Y10T292/0917—Lever

Definitions

  • Flush type latch assemblies are used extensively on aircraft for receiving flush mounted hinged or removable panels. Such panels are subject to substantial, even excessive, stress and care must be taken that each latch assembly is properly adjusted to take its share of the load. Usually adjustment has required unfastening the latch assembly, making an adjustment, then relatching the assembly, a time consuming and not always dependable procedure. Special latch assemblies have been developed wherein the latch arm is externally accessible for adjustment.
  • the present invention is directed to an externally accessible adjuster for the latch keeper rather than the latch itself, and is summarized in the following objects.
  • a latch keeper adjuster wherein the keeper shaft is screwthreaded and a screwthreaded wheel having radial tool receiving slots is fitted thereon and axially restrained by a fixed housing, the slots being accessible through a small access opening provided in the adjacent structure.
  • FIGS. 1 through 4 are directed to a first embodiment in which:
  • FIG. 1 is a side view of a conventional flush type latch set in a surrounding surface, the latch lever of the latch structure shown attached to the externally accessible adjuster constituting the present invention.
  • FIG. 2 is an enlarged sectional view thereof taken through 2--2 of FIG. 1 with adjacent portions of the aircraft structure shown fragmentarily.
  • FIG. 3 is an enlarged sectional view taken through 3--3 of FIG. 2, the surrounding structure being omitted.
  • FIG. 4 is a bottom view taken from 4--4 of FIG. 3.
  • FIGS. 5 through 7 are directed to a second embodiment, in which:
  • FIG. 5 is an enlarged fragmentary sectional view taken through 5--5 of FIG. 6.
  • FIG. 6 is an enlarged fragmentary sectional view taken through 6--6 of FIG. 5.
  • FIG. 7 is an enlarged end view with a portion of the supporting means shown fragmentarily and in section.
  • the externally accessible adjuster for flush latches is particularly adapted for use on aircraft represented fragmentarily by surface structure 1 in which is set a panel 2 supported in a surrounding frame 3.
  • the externally accessible adjuster may be adapted for use with a variety of latch assemblies.
  • the latch assembly herein illustrated is essentially that shown in U.S. Pat. No. 2,712,955.
  • a wide variety of flush type hook latches may be used; for example, but not limited to, the flush type latches shown in U.S. Pat. Nos. 2,894,777; 2,904,141; 3,318,624; 3,503,642; 3,515,422 and 3,542,410.
  • the selected latch assembly designated 4 includes a handle 5 adapted to occupy a flush position in the panel 2.
  • the handle is pivoted about a journal pin 6 so that it may be moved between a flushed closed position and an angular position for manual engagement.
  • a flush type linking latch 10 carried by the handle 5 and adapted to secure the handle and the latch arm 8 when the latch assembly is in its closed position shown in FIG. 1.
  • the linking latch 10 is manually engagable for releasing the handle.
  • FIGS. 1 through 4 One embodiment of the adjuster for flush latches is shown in FIGS. 1 through 4 and includes an adjuster assembly 11 having a keeper 12 which is U-shaped and provided with a cross pin 13 positioned for engagement with the hook end 9 of the latch arm 8. Extending from the keeper 12 is a screwthreaded shaft 14 which extends through the adjacent portion of the frame 3.
  • a housing 15 in the form of a rectangular frame and including a base 16 secured by screws 17 to the frame 3.
  • a parallel plate 18 Spaced from the base plate 16 is a parallel plate 18 which is joined to the base plate 16 by end walls 19.
  • Extending from the plate 18 is a sleeve 20.
  • the shaft 14 extends between the plate 16 and 18 and through the sleeve 20.
  • a tension adjustment wheel 21 Received between the base plate 16 and parallel plate 18 is a tension adjustment wheel 21 having radial slots 22.
  • the wheel 21 is provided with a screwthreaded bore 23 which does not directly engage the screwthreaded shaft 14 but instead a helical wire coil 24 is interposed which coil provides a predetermined degree of friction between the wheel and the shaft.
  • the coil 24 may be the type known commercially as "Heli Coil". It should be noted, however, that other conventional friction .Iadd.or restraining .Iaddend.means may be provided between the wheel and shaft or between the wheel and the housing.
  • the wheel is in close proximity to the surface of the aircraft structure and is made externally accessible by a small aperture 25 through which a screwdriver 26 or other similar tool may be inserted to engage the radial slots 22. Sequential engagement of the slots may rotate the wheel in either direction so as to advance or retract the shaft 14.
  • the shaft is provided with an axial slot 27 which receives a cross pin 28 anchored in the sleeve 20.
  • FIGS. 5 through 7 The second embodiment of the adjuster for flush latches is shown in FIGS. 5 through 7 and utilizes the surface structure 1 and handle .[.2.]. .Iadd.5 .Iaddend.previously described; however, a conventional frame member 29 is utilized in place of the surrounding frame 3.
  • This embodiment of the adjuster for flush latches utilizes the latch assembly 4 and the components thereof as previously described.
  • the adjuster includes an adjuster assembly 30 having a U-shaped keeper 31 provided with a cross pin 32 and a screwthreaded shaft 33 similar except for proportions to the first described keeper.
  • the shaft 33 receives a tension adjustment wheel 34 having an internally screwthreaded sleeve 35 having a flanged end 36 provided with radial slots 37, and in this respect is similar to the sleeve 20 and tension adjustment wheel 21.
  • a base plate 38 is received on the shaft 33 adjacent to the keeper 12.
  • the base plate 38 includes laterally spaced raised portions 39 between which is positioned the flanged end 36 of the tension adjustment wheel 34.
  • the raised portions 39 engage the frame member 29 so that the flanged end 36 is freely rotatable but is axially restrained with respect to the base plate 38. Screws 40 secure the base plate to the frame member.
  • the flanged end 36 is positioned in a plane disposed adjacent an end of the panel opening 41 which receives the handle 5.
  • the base plate 38 is provided with an extension 42.
  • the base plate is provided with an axially extending detent socket 43 which receives a detent ball 44 backed by a spring 45 and positioned to engage the radial slots 37.
  • the standard type of flush latch is so arranged that the handle 5 is capable of limited rotational movement without altering the connection between the latch arm 8 and the keeper cross pin 32. This is accomplished by releasing the linking latch 10. As shown in FIG. 6, this initial angular movement of the handle 5 pivots it away from the end of the opening.
  • the flanged end 36 of the adjustment wheel 34 is so positioned as to be readily accessible so that a turning tool may be inserted adjacent the end of the opening 41.
  • the turning tool may be a conventional Allen wrench 46. Arcuate motion of the turning tool may be accomplished as indicated in FIG. 7. Such movement advances or retracts the shaft 33.
  • a cross pin stop 47 may be provided.

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  • Pivots And Pivotal Connections (AREA)

Abstract

An externally accessible adjuster, particularly suited for adjusting the tension of a keeper shaft as applied to a hook type latch forming a part of a flush type latch assembly, the keeper shaft being screwthreaded and receiving a screwthreaded wheel having a set of radiating slots exposed in sequence through an access opening formed in the wall of the structure utilizing the flush type latch assembly. Two embodiments are illustrated, either one of which may use an opening which may be arranged to receive the latch handle, or a separate opening; also, either adjuster may be arranged to utilize a helically coiled frictional element or a yieldable detent.

Description

BACKGROUND
Flush type latch assemblies are used extensively on aircraft for receiving flush mounted hinged or removable panels. Such panels are subject to substantial, even excessive, stress and care must be taken that each latch assembly is properly adjusted to take its share of the load. Usually adjustment has required unfastening the latch assembly, making an adjustment, then relatching the assembly, a time consuming and not always dependable procedure. Special latch assemblies have been developed wherein the latch arm is externally accessible for adjustment.
SUMMARY
The present invention is directed to an externally accessible adjuster for the latch keeper rather than the latch itself, and is summarized in the following objects.
First, to provide a latch keeper adjuster which is externally accessible and may be adapted for use with a variety of standard latch assemblies.
Second, to provide a latch keeper adjuster, as indicated in the preceding object, which is capable of being installed as a replacement for a conventional keeper, the latch assembly requiring little if any alteration.
Third, to provide a latch keeper adjuster wherein the keeper shaft is screwthreaded and a screwthreaded wheel having radial tool receiving slots is fitted thereon and axially restrained by a fixed housing, the slots being accessible through a small access opening provided in the adjacent structure.
Fourth, to provide a flush latch keeper adjuster, an embodiment of which may be sufficiently compact that an adjustment tool may be inserted through the latch handle opening when the latch handle is in its initial open position while the latch hook is still in engagement with the keeper.
BRIEF DESCRIPTION OF THE FIGURES
FIGS. 1 through 4 are directed to a first embodiment in which:
FIG. 1 is a side view of a conventional flush type latch set in a surrounding surface, the latch lever of the latch structure shown attached to the externally accessible adjuster constituting the present invention.
FIG. 2 is an enlarged sectional view thereof taken through 2--2 of FIG. 1 with adjacent portions of the aircraft structure shown fragmentarily.
FIG. 3 is an enlarged sectional view taken through 3--3 of FIG. 2, the surrounding structure being omitted.
FIG. 4 is a bottom view taken from 4--4 of FIG. 3.
FIGS. 5 through 7 are directed to a second embodiment, in which:
FIG. 5 is an enlarged fragmentary sectional view taken through 5--5 of FIG. 6.
FIG. 6 is an enlarged fragmentary sectional view taken through 6--6 of FIG. 5.
FIG. 7 is an enlarged end view with a portion of the supporting means shown fragmentarily and in section.
DETAILED DESCRIPTION
The externally accessible adjuster for flush latches is particularly adapted for use on aircraft represented fragmentarily by surface structure 1 in which is set a panel 2 supported in a surrounding frame 3.
The externally accessible adjuster may be adapted for use with a variety of latch assemblies. The latch assembly herein illustrated is essentially that shown in U.S. Pat. No. 2,712,955. However, a wide variety of flush type hook latches may be used; for example, but not limited to, the flush type latches shown in U.S. Pat. Nos. 2,894,777; 2,904,141; 3,318,624; 3,503,642; 3,515,422 and 3,542,410.
The selected latch assembly designated 4 includes a handle 5 adapted to occupy a flush position in the panel 2. The handle is pivoted about a journal pin 6 so that it may be moved between a flushed closed position and an angular position for manual engagement. Connected to the handle 5 by a journal pin 7 as a latch arm 8 having a hook end 9. When in the flush position, the handle 5 and latch arm 8 are joined together by a flush type linking latch 10 carried by the handle 5 and adapted to secure the handle and the latch arm 8 when the latch assembly is in its closed position shown in FIG. 1. The linking latch 10 is manually engagable for releasing the handle.
One embodiment of the adjuster for flush latches is shown in FIGS. 1 through 4 and includes an adjuster assembly 11 having a keeper 12 which is U-shaped and provided with a cross pin 13 positioned for engagement with the hook end 9 of the latch arm 8. Extending from the keeper 12 is a screwthreaded shaft 14 which extends through the adjacent portion of the frame 3.
Mounted on the frame 3 is a housing 15 in the form of a rectangular frame and including a base 16 secured by screws 17 to the frame 3. Spaced from the base plate 16 is a parallel plate 18 which is joined to the base plate 16 by end walls 19. Extending from the plate 18 is a sleeve 20. The shaft 14 extends between the plate 16 and 18 and through the sleeve 20.
Received between the base plate 16 and parallel plate 18 is a tension adjustment wheel 21 having radial slots 22. The wheel 21 is provided with a screwthreaded bore 23 which does not directly engage the screwthreaded shaft 14 but instead a helical wire coil 24 is interposed which coil provides a predetermined degree of friction between the wheel and the shaft.
The coil 24 may be the type known commercially as "Heli Coil". It should be noted, however, that other conventional friction .Iadd.or restraining .Iaddend.means may be provided between the wheel and shaft or between the wheel and the housing.
It will be noted in FIG. 1 that the wheel is in close proximity to the surface of the aircraft structure and is made externally accessible by a small aperture 25 through which a screwdriver 26 or other similar tool may be inserted to engage the radial slots 22. Sequential engagement of the slots may rotate the wheel in either direction so as to advance or retract the shaft 14. In order to prevent rotation of the shaft, the shaft is provided with an axial slot 27 which receives a cross pin 28 anchored in the sleeve 20.
The second embodiment of the adjuster for flush latches is shown in FIGS. 5 through 7 and utilizes the surface structure 1 and handle .[.2.]. .Iadd.5 .Iaddend.previously described; however, a conventional frame member 29 is utilized in place of the surrounding frame 3. This embodiment of the adjuster for flush latches utilizes the latch assembly 4 and the components thereof as previously described.
The adjuster includes an adjuster assembly 30 having a U-shaped keeper 31 provided with a cross pin 32 and a screwthreaded shaft 33 similar except for proportions to the first described keeper.
The shaft 33 receives a tension adjustment wheel 34 having an internally screwthreaded sleeve 35 having a flanged end 36 provided with radial slots 37, and in this respect is similar to the sleeve 20 and tension adjustment wheel 21. A base plate 38 is received on the shaft 33 adjacent to the keeper 12. The base plate 38 includes laterally spaced raised portions 39 between which is positioned the flanged end 36 of the tension adjustment wheel 34.
The raised portions 39 engage the frame member 29 so that the flanged end 36 is freely rotatable but is axially restrained with respect to the base plate 38. Screws 40 secure the base plate to the frame member. The flanged end 36 is positioned in a plane disposed adjacent an end of the panel opening 41 which receives the handle 5. To prevent rotation of the shaft 33 and keeper 31, the base plate 38 is provided with an extension 42. The base plate is provided with an axially extending detent socket 43 which receives a detent ball 44 backed by a spring 45 and positioned to engage the radial slots 37.
Operation of the embodiment of the adjuster for flush latches shown in FIGS. 5, 6 and 7 is as follows.
The standard type of flush latch is so arranged that the handle 5 is capable of limited rotational movement without altering the connection between the latch arm 8 and the keeper cross pin 32. This is accomplished by releasing the linking latch 10. As shown in FIG. 6, this initial angular movement of the handle 5 pivots it away from the end of the opening. The flanged end 36 of the adjustment wheel 34 is so positioned as to be readily accessible so that a turning tool may be inserted adjacent the end of the opening 41. The turning tool may be a conventional Allen wrench 46. Arcuate motion of the turning tool may be accomplished as indicated in FIG. 7. Such movement advances or retracts the shaft 33. In use, the tension adjustment wheel 34 is not subject to rotational force; therefore, the ball detent 44 secures the adjustment which is made in increments of the spacing between the radial slots 37.Iadd., and restrain rotational movement of the tension adjustment wheel 21. .Iaddend.To prevent excess movement of the shaft 33, a cross pin stop 47 may be provided.
Having fully described my invention, it is to be understood that I am not to be limited to the details herein set forth, but that my invention is of the full scope of the appended claims.

Claims (11)

I claim: .[.
1. The combination with a flush type latch structure mounted in a panel set flush in a surrounding surface structure, an underlying mounting means, and an access opening adjacent the mounting means, the latch structure including a handle member movable in a clearance opening between a flush position and an angular position with respect to the panel, and a latch arm, of an adjustable keeper assembly, comprising:
a. a keeper element removably attached to the latch arm;
b. a screwthreaded shaft extending from the keeper element;
c. a guide means receiving the shaft and secured to the mounting means;
d. a wheel screwthreaded on the shaft and axially restrained by the guide means, the wheel having a ring of radially extending slots accessible in sequence through the access opening by a turning tool, whereby the wheel may be turned to advance or retract the keeper and latch arm while interengaged, said wheel having internal screwthreads spaced from the screwthreads of said shaft; and
e. frictional means for advancing or retracting the keeper and latch arm by rotating said wheel, said frictional means being positioned between said wheel and said internal shaft screwthreads..]. .[.2. A keeper assembly, as defined in claim 1, wherein:
a. the ring of slots are disposed under the extended end of the handle member, and utilize as the access opening the corresponding end of the handle member clearance opening..]. .[.3. A keeper assembly, as defined in claim 1, wherein:
a. means is provided to restrain the shaft and wheel against relative movement when the wheel is disengaged..]. .[.4. The keeper assembly claimed in claim 1 wherein said frictional means is further defined as a helical coil..]. .[.5. The combination with a flush type latch structure mounted in a panel set flush in a surrounding surface structure, an underlying mounting means, and an access opening adjacent the mounting means, the latch structure including a handle member movable in a clearance opening between a flush position and an angular position with respect to the panel, and a latch arm, of an adjustable keeper assembly, comprising:
a. a keeper element removably attached to the latch arm;
b. a screwthreaded shaft extending from the keeper element;
c. a guide means receiving the shaft and secured to the mounting means;
d. a wheel screwthreaded on the shaft and axially restrained by the guide means, the wheel having a ring of radially extending slots accessible in sequence through the access opening by a turning tool, whereby the wheel may be turned to advance or retract the keeper and latch arm while interengaged, said wheel having internal screwthreads spaced from the screwthreads of said shaft; and
e. helical coil frictional means for advancing or retracting the keeper and latch arm by rotating said wheel, said frictional means being positioned
between said wheel and said internal shaft screwthreads..]. .Iadd.6. An adjustable latching apparatus adapted for mounting on an aircraft or the like to secure a first aircraft member relative to a second aircraft member, comprising:
a latch assembly connected to said first aircraft member and an adjuster assembly connected to said second aircraft member;
said adjuster assembly including a tension adjustment wheel and a keeper;
said latch assembly including a latch arm engageable with said keeper and during engagement therewith operably connecting said keeper with said first aircraft member;
said tension adjustment wheel being adapted to receive said keeper and cause relative axial movement of said keeper with respect to said adjustment wheel and said aircraft members when said aircraft members are fixably positioned relative to one another and without axial movement of said tension adjustment wheel with respect to said aircraft members and thereby adjust the load substantially equally between said keeper and said latch arm and said aircraft members during axial movement of said keeper when said latch arm and said keeper are in engagement; and
frictional means restraining means being adapted to engage said tension adjustment wheel and thereby retard rotational movement thereof after
adjustment of the load..Iaddend. .Iadd.7. The apparatus of claim 6 wherein a screwthreaded bore on said tension adjustment wheel engages a screwthreaded shaft on said keeper..Iaddend. .Iadd.8. The apparatus of claim 7 wherein said screwthreaded shaft is threaded in a single direction..Iaddend. .Iadd.9. The apparatus of claim 6 wherein said restraining means comprises a ball detent biased against said tension adjustment wheel..Iaddend. .Iadd.10. The apparatus of claim 6 wherein said restraining means is positioned between said screwthreaded bore and said screwthreaded shaft..Iaddend. .Iadd.11. The apparatus of claim 10 wherein said restraining means is further defined as a helical coil..Iaddend. .Iadd.12. The apparatus of claim 6 wherein means are provided to prevent rotation of said keeper during axial movement thereof..Iaddend. .Iadd.13. The apparatus of claim 12 wherein said means to prevent rotation of said keeper comprises a pin member which is secured to said guide means and
which engages a slot in said keeper..Iaddend. .Iadd.14. In an aircraft adjustable latching apparatus for securing a member of an aircraft having a latch assembly and a tension adjuster for adjusting the load to be applied to said latch assembly, the combination comprising:
a latch arm operable connected to a first member of the aircraft;
mounting means to connect said tension adjuster to a second member of the aircraft;
said tension adjuster including a rotatable tension adjustment wheel and a keeper element removably engaging said latch arm, said keeper element including a screwthreaded shaft extending therefrom;
guide means secured to said mounting means, said tension adjustment wheel being axially restrained by said guide means during rotational movement of said tension adjustment wheel;
said tension adjustment wheel having a screwthreaded bore through which said screwthreaded shaft extends and which is operably connected therewith to cause relative axial movement of said keeper element with respect to said tension adjustment wheel during rotational movement of said tension adjustment wheel whereby said tension adjustment wheel may be rotated to axially advance or retract said keeper element while engaging said latch arm and thereby adjust substantially equally the tension in said keeper element and said latch arm and thus said latch assembly when said first aircraft member is fixably positioned with respect to said second aircraft member; and
restraining means operably engaging said tension adjustment wheel to secure the adjustment and prevent inadvertent axial movement of said keeper element by retarding rotational movement of said tension adjustment
wheel..Iaddend. .Iadd.15. The apparatus of claim 14, wherein said latch arm provides the single operable connection between said keeper element and said first aircraft member..Iaddend. .Iadd.16. The apparatus of claim 15, wherein said tension adjustment wheel includes a plurality of radially extending slots adapted to receive a tool for rotating said tension adjustment wheel..Iaddend. .Iadd.17. The apparatus of claim 16, wherein said screwthreaded bore engages said screwthreaded shaft and said restraining means comprises a ball detent biased against said tension adjustment wheel..Iaddend. .Iadd.18. The apparatus of claim 16, wherein said restraining means comprises a helical coil positioned between said
screwthreaded bore and said screwthreaded shaft..Iaddend. .Iadd.19. In an aircraft adjustable latching apparatus with a latch assembly set flush in the surrounding surface of an aircraft panel and having an underlying mounting means with an external access opening adjacent the mounting means, the combination comprising:
a tension adjuster for adjusting the tension in the latch assembly, including a rotatable tension adjustment wheel and a keeper element having a screwthreaded shaft extending therefrom;
a latch arm engageable with said keeper element and a pivotally connected handle member movable when said latch arm engages said keeper element in a clearance opening in said panel between a flush position closing said external access opening and an angular position with respect to the panel;
guide means secured to said mounting means, said tension adjustment wheel being axially restrained by said guide means during rotational movement of said tension adjustment wheel;
said tension adjustment wheel positioned adjacent said external access opening for access thereto through said external access opening when said handle member is in the angular position;
said tension adjustment wheel having a screwthreaded bore through which said screwthreaded shaft extends and which is operably connected therewith to cause relative axial movement of said keeper element with respect to said tension adjustment wheel during rotational movement of said tension adjustment wheel whereby when said keeper element and said latch arm are engaged said tension adjustment wheel may be rotated to advance or retract said keeper element and thereby adjust substantially equally the tension in said keeper element and said latch assembly; and
restraining means operably engaging said tension adjustment wheel to secure the adjustment and prevent inadvertent axial movement of said keeper element by retarding rotational movement of said tension adjustment
wheel..Iaddend. .Iadd.20. The apparatus of claim 19, wherein said tension adjustment wheel includes means adapted to receive a tool through said external access opening to rotate said tension adjustment wheel..Iaddend. .Iadd.21. The apparatus of claim 20, wherein the means comprises a ring of radially extending slots accessible in sequence through said external access opening..Iaddend. .Iadd.22. The apparatus of claim 19, wherein said keeper element is adapted to be removably engaged to said latch arm below the surrounding surface..Iaddend. .Iadd.23. An adjustable latching apparatus for mounting on an aircraft or the like to secure a first aircraft member relative to a second aircraft member with at least one of said aircraft members having an exterior panel surface which includes an external access opening, comprising:
a latch assembly connected to said first aircraft member;
an adjuster assembly for adjusting a load in said latch assembly and having a rotatable adjustment wheel and a keeper element including a screwthreaded shaft extending therefrom;
underlying means to connect said adjuster assembly to said second aircraft member and position said adjustment wheel adjacent said external access opening for access to said adjustment wheel;
said latch assembly including a latch arm engageable with said keeper element and during engagement therewith operably connecting said keeper element with said first aircraft member;
housing means for said adjustment wheel adapted to axially restrain said adjustment wheel during rotational movement thereof;
said adjustment wheel having a screwthreaded bore through which said screwthreaded shaft extends and which is operably connected therewith to cause relative axial movement of said keeper element with respect to said adjustment wheel during rotational movement of said adjustment wheel whereby said adjustment wheel may be rotated to axially advance or retract said keeper element while engaging said latch arm and thereby adjust the load substantially equally between said latch assembly, said keeper and said aircraft members when said aircraft members are fixably positioned relative to one another;
said adjustment wheel having a radially extending portion with a ring of radially extending slots therein accessible in sequence through said external access opening and adapted to receive a tool through said external access opening to rotate said adjustment wheel; and
restraining means operably engaging said adjustment wheel and being adapted to permit rotational movement of said adjustment wheel when acted on by said tool during adjustment of the load and to automatically retard rotational movement of said adjustment wheel after adjustment of the
load..Iaddend. .Iadd.24. The apparatus of claim 23, wherein said radially extending slots include an open end proximate the circumference of said adjustment wheel adapted to receive said tool and said adjustment wheel is adapted to locate one or more of said open ends immediately opposite said external access opening during any rotational position of said adjustment wheel..Iaddend. .Iadd.25. The apparatus of claim 24, wherein the diameter of said adjustment wheel may exceed the width of said external access opening..Iaddend. .Iadd.26. The apparatus of claim 23, wherein said adjuster assembly is adapted to be operated by a single tool and to cause adjustment with a single operation of said tool..Iaddend. .Iadd.27. The apparatus of claim 26, wherein said adjuster assembly is adapted to be operated by an Allen wrench..Iaddend. .Iadd.28. The apparatus of claim 23, wherein said latch assembly is adapted when closed to be set flush with the surrounding exterior surface of said panel and includes a pivotally connected handle member movable when said latch arm engages said keeper element in a clearance opening in said panel between a flush position closing said external access opening and an angular position with respect
to the panel..Iaddend. .Iadd.29. The apparatus of claim 23, wherein said restraining means remains biased against said adjustment wheel during rotational movement thereof..Iaddend. .Iadd.30. The apparatus of claim 23, wherein said housing means includes at least one plate adjacent said adjustment wheel and adapted to abut one of said aircraft members and thereby provide structural support to said adjuster assembly..Iaddend. .Iadd.31. The apparatus of claim 30, wherein said housing means includes a pair of parallel plates, one on each side of said radially extending portion of said adjustment wheel..Iaddend. .Iadd.32. The apparatus of claim 23, wherein said adjustment wheel includes an axially extending sleeve which defines said screwthreaded bore and which receives and supports said screwthreaded shaft of said keeper element..Iaddend. .Iadd.33. The apparatus of claim 23, wherein said adjustment wheel is
positioned below said exterior panel surface..Iaddend. .Iadd.34. In an aircraft adjustable latching apparatus having a latch assembly with a latch arm and adapted to secure a first aircraft member relative to a second aircraft member with at least one of said aircraft members having an exterior panel which includes an external access opening, an adjuster assembly for adjusting a load in the latch assembly, comprising:
a rotatable adjustment wheel and a keeper element engageable with the latch arm to secure the first and second aircraft members including a screwthreaded shaft extending therefrom;
means for mounting said adjuster assembly for connecting with said second aircraft member and to position said adjustment wheel beneath the exterior panel surface and adjacent said external access opening for access to said adjustment wheel;
said adjustment wheel having a radially extending portion with a ring of radially extending slots therein accessible in sequence through said external access opening and adapted to receive a tool through said external access opening to rotate said adjustment wheel;
housing means for said adjustment wheel adapted to axially restrain said adjustment wheel during rotational movement thereof, said housing means including at least one plate member adjacent a side of said radially extending portion of said adjustment wheel;
a screwthreaded bore in said adjustment wheel through which said screwthreaded shaft extends and which is operably connected therewith to cause relative axial movement of said keeper element with respect to said adjustment wheel whereby the adjustment wheel may be rotated to axially advance or retract in substantially infinite increments said keeper element while engaging the latch arm and adjust the load substantially equally in said keeper element and the latch assembly; and
restraining means operably engaging said adjustment wheel and thereby retard rotational movement thereof after adjustment of the load..Iaddend. .Iadd.35. In an aircraft adjustable latching apparatus for securing a member of an aircraft having a latch assembly and a tension adjuster for adjusting the load to be applied to said latch assembly, the combination comprising:
a latch arm operably connected to a first member of the aircraft;
mounting means to connect said tension adjuster to a second member of the aircraft;
said tension adjuster including a rotatable tension adjustment wheel and a keeper element removably engaging said latch arm, said keeper element including a screwthreaded shaft extending therefrom;
guide means secured to said mounting means, said tension adjustment wheel being axially restrained by said guide means during rotational movement of said tension adjustment wheel;
said tension adjustment wheel having a screwthreaded bore through which said screwthreaded shaft extends and which is operably connected therewith to cause relative axial movement of said keeper element with respect to said tension adjustment wheel during rotational movement of said tension adjustment wheel whereby said tension adjustment wheel may be rotated to axially advance or retract said keeper element while engaging said latch arm and thereby adjust substantialy equally the tension in said keeper element and said latch arm and thus said latch assembly when said first aircraft member is fixably positioned with respect to said second aircraft member; and
frictional means positioned between said screwthreaded bore and said screwthreaded shaft and thereby operably connecting said bore and said shaft, said frictional means being adapted to prevent inadvertent axial movement of said keeper element by restraining rotational movement of said
tension adjustment wheel..Iaddend. .Iadd.36. In an aircraft adjustable latching apparatus for securing a member of an aircraft having a latch assembly and a tension adjuster for adjusting the load to be applied to said latch assembly, the combination comprising:
a latch arm operably connected to a first member of the aircraft;
mounting means to connect said tension adjuster to a second member of the aircraft;
said tension adjuster including a rotatable tension adjustment wheel and a keeper element removably engaging said latch arm, said keeper element including a screwthreaded shaft extending therefrom;
guide means secured to said mounting means, said tension adjustment wheel being axially restrained by said guide means during rotational movement of said tension adjustment wheel;
said tension adjustment wheel having a screwthreaded bore through which said screwthreaded shaft extends and which is operably connected therewith to cause relative axial movement of said keeper element with respect to said tension adjustment wheel during rotational movement of said tension adjustment whereby said tension adjustment wheel may be rotated to axially advance or retract said keeper element while engaging said latch arm and thereby adjust substantially equally the tension in said keeper element and said latch arm and thus said latch assembly when said first aircraft member is fixably positioned with respect to said second aircraft member; and
yieldable detent means biased against said tension adjustment wheel, said yieldable detent means being adapted to prevent inadvertent axial movement of said keeper element by restraining rotational movement of said tension adjustment wheel..Iaddend.
US06/194,145 1978-03-01 1980-10-06 Externally accessible adjuster for flush latches Expired - Lifetime USRE31935E (en)

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Application Number Priority Date Filing Date Title
US06/194,145 USRE31935E (en) 1978-03-01 1980-10-06 Externally accessible adjuster for flush latches

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Application Number Priority Date Filing Date Title
US05/882,173 US4183564A (en) 1978-03-01 1978-03-01 Externally accessible adjuster for flush latches
US06/194,145 USRE31935E (en) 1978-03-01 1980-10-06 Externally accessible adjuster for flush latches

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Cited By (19)

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Publication number Priority date Publication date Assignee Title
US5016931A (en) * 1989-06-20 1991-05-21 The Hartwell Corporation Latching mechanism having a pre-adjusted load
US5048878A (en) * 1988-04-27 1991-09-17 Nippon Cable System Inc. Striker for lid of fuel inlet chamber
US5620212A (en) * 1995-08-28 1997-04-15 Hartwell Corporation Low profile hook latch assembly
US6755448B2 (en) 2001-06-20 2004-06-29 Hartwell Corporation Blowout latch
US20060214431A1 (en) * 2005-03-25 2006-09-28 Helsley Thomas J Latch mechanism
US20110193351A1 (en) * 2010-02-09 2011-08-11 Thai Do Side-driven action pin latch
CN102191876A (en) * 2010-03-18 2011-09-21 美铝公司 Latch with adjustable handle
US8646819B2 (en) 2011-10-31 2014-02-11 Alcoa Inc. Rotary-handle latch
US8807604B2 (en) 2011-12-02 2014-08-19 Alcoa Inc. Pin latch with detection device and movable catch-pin and intermediate position with automatic return mechanism
US9273488B1 (en) * 2013-07-15 2016-03-01 Avibank Manufacturing, Inc. Positive locking keeper
US10240389B2 (en) 2015-09-30 2019-03-26 Arconic Inc. Pressure relief door
US10309126B2 (en) 2016-01-21 2019-06-04 Arconic Inc. Pawl latch
US10337218B2 (en) 2015-07-08 2019-07-02 Arconic Inc. Handle mechanisms
US10378256B2 (en) 2015-10-30 2019-08-13 Arconic Inc. Pressure relief latch
US10435929B2 (en) 2015-08-26 2019-10-08 Arconic Inc. Adjustable pressure relief latch
US10604977B2 (en) 2015-08-04 2020-03-31 Arconic Inc. Pressure relief latch
US10676971B2 (en) 2016-06-13 2020-06-09 Arconic Inc. Rotary latch system
US10760304B2 (en) * 2015-09-01 2020-09-01 Howmet Aerospace Inc. Adjustable hook latch
US11041331B2 (en) 2015-04-03 2021-06-22 Howmet Aerospace Inc. Latch having tool recess in trigger

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US5048878A (en) * 1988-04-27 1991-09-17 Nippon Cable System Inc. Striker for lid of fuel inlet chamber
US5016931A (en) * 1989-06-20 1991-05-21 The Hartwell Corporation Latching mechanism having a pre-adjusted load
US5620212A (en) * 1995-08-28 1997-04-15 Hartwell Corporation Low profile hook latch assembly
US6755448B2 (en) 2001-06-20 2004-06-29 Hartwell Corporation Blowout latch
US20060214431A1 (en) * 2005-03-25 2006-09-28 Helsley Thomas J Latch mechanism
US7185926B2 (en) 2005-03-25 2007-03-06 Hartwell Corporation Preloaded latch mechanism
US20110193351A1 (en) * 2010-02-09 2011-08-11 Thai Do Side-driven action pin latch
US8727390B2 (en) 2010-02-09 2014-05-20 Alcoa Inc. Side-driven action pin latch
CN102191876A (en) * 2010-03-18 2011-09-21 美铝公司 Latch with adjustable handle
WO2011115792A1 (en) * 2010-03-18 2011-09-22 Alcoa Inc. Latch with adjustable handle
US20110227350A1 (en) * 2010-03-18 2011-09-22 Thai Do Latch with adjustable handle
US8864185B2 (en) * 2010-03-18 2014-10-21 Alcoa Inc. Latch with adjustable handle
US8646819B2 (en) 2011-10-31 2014-02-11 Alcoa Inc. Rotary-handle latch
US8807604B2 (en) 2011-12-02 2014-08-19 Alcoa Inc. Pin latch with detection device and movable catch-pin and intermediate position with automatic return mechanism
US9523221B2 (en) 2011-12-02 2016-12-20 Alcoa Inc. Pin latch with detection device and movable catch-pin and intermediate position with automatic return mechanism
US9273488B1 (en) * 2013-07-15 2016-03-01 Avibank Manufacturing, Inc. Positive locking keeper
US11041331B2 (en) 2015-04-03 2021-06-22 Howmet Aerospace Inc. Latch having tool recess in trigger
US10337218B2 (en) 2015-07-08 2019-07-02 Arconic Inc. Handle mechanisms
US10604977B2 (en) 2015-08-04 2020-03-31 Arconic Inc. Pressure relief latch
US10435929B2 (en) 2015-08-26 2019-10-08 Arconic Inc. Adjustable pressure relief latch
US10760304B2 (en) * 2015-09-01 2020-09-01 Howmet Aerospace Inc. Adjustable hook latch
US10240389B2 (en) 2015-09-30 2019-03-26 Arconic Inc. Pressure relief door
US10378256B2 (en) 2015-10-30 2019-08-13 Arconic Inc. Pressure relief latch
US10309126B2 (en) 2016-01-21 2019-06-04 Arconic Inc. Pawl latch
US10676971B2 (en) 2016-06-13 2020-06-09 Arconic Inc. Rotary latch system

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