US20150315844A1 - Thick plate type joint lock for ladder connection - Google Patents

Thick plate type joint lock for ladder connection Download PDF

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Publication number
US20150315844A1
US20150315844A1 US14/380,037 US201314380037A US2015315844A1 US 20150315844 A1 US20150315844 A1 US 20150315844A1 US 201314380037 A US201314380037 A US 201314380037A US 2015315844 A1 US2015315844 A1 US 2015315844A1
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US
United States
Prior art keywords
plate
thick
ladder
slot
stub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/380,037
Inventor
Xiaochun MIAO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUZHOU DONGRUN LADDER Co Ltd
Suzhou Dongrun Ladder Co Ltd A Co
Original Assignee
Suzhou Dongrun Ladder Co Ltd A Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Dongrun Ladder Co Ltd A Co filed Critical Suzhou Dongrun Ladder Co Ltd A Co
Assigned to SUZHOU DONGRUN LADDER CO., LTD. reassignment SUZHOU DONGRUN LADDER CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIAO, Xiaochun
Publication of US20150315844A1 publication Critical patent/US20150315844A1/en
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/50—Joints or other connecting parts
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D11/00—Additional features or accessories of hinges
    • E05D11/06—Devices for limiting the opening movement of hinges
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D11/00—Additional features or accessories of hinges
    • E05D11/10—Devices for preventing movement between relatively-movable hinge parts
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D11/00—Additional features or accessories of hinges
    • E05D11/10—Devices for preventing movement between relatively-movable hinge parts
    • E05D11/1007—Devices for preventing movement between relatively-movable hinge parts with positive locking
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/32—Ladders with a strut which is formed as a ladder and can be secured in line with the ladder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/10—Arrangements for locking

Definitions

  • the present invention relates to a structure member for ladder jointing, in particular to a thick-plate hinge for ladder jointing.
  • the thick-plate hinge 10 comprises an inner plate 11 and outer plates 12 that are folded on outer sides of the inner plate, the inner plate 11 and outer plate 12 are relatively rotatable; the thick-plate hinge 10 further comprises a positioning shaft sleeve 13 designed to lock up and position the inner plate 11 and outer plates 12 , wherein, the positioning shaft sleeve 13 has a shaft 14 and a lock pin 15 , the outer plate 12 has a stop stub 16 fixed on it, and the stop stub 16 butts against an outer arc surface 110 of the inner plate 11 when the relative rotation angle between the inner plate 11 and the outer plate 12 reaches 180°.
  • the stop stub 16 can improves the bearing performance of the thick-plate hinge 10 .
  • the inner plate 11 and outer plates 12 of the thick-plate hinge 10 can be locked up when they rotate to a preset angle in relation to each other, for example, the inner plate 11 and outer plates 12 can be locked up via the positioning shaft sleeve 13 when the unfolding angle is 0°, 36°, or 180°.
  • two thick-plate hinge 10 can be connected between an upper ladder section and a lower ladder section, so that the ladder can be transformed into a double-sided ladder (with 36° unfolding angle) or a long straight ladder (with 180° unfolding angle), to attain multiple purposes.
  • both the inner plate and the outer plate of the two thick-plate hinges are unfolded to 180°.
  • the tested ladder When tested in unexpected state or under specific conditions, e.g., tested as per the ladder standards of USA or that of Australia, the tested ladder must be able to bear the test load in a case that either thick-plate hinge work in fail state (the lock pin 15 is drawn out of the lock pin hole).
  • the present invention provides a new thick-plate hinge, which has better bearing performance and is safer and more reliable.
  • the present invention provides a thick-plate hinge for ladder jointing, comprising an inner plate and outer plates that are folded on both outer sides of the inner plate, the inner plate and outer plates are relatively rotatable; the thick-plate hinge further comprises a positioning shaft sleeve that is designed to lock up and position the inner plate and outer plates, and the outer plate has a stop stub fixed on it, wherein, the inner plate has a slot designed to limit the displacement of the stop stub, and the stop stub will enter into the slot partially or entirely when the relative rotation angle between the inner plate and the outer plate reaches 180°.
  • the stop stub is a cylindrical stub
  • the bottom surface of the slot is an inwardly concaved arc surface
  • the arc surface is tangentially fit the outer circumferential surface of the stop stub. More preferably, the radius of the arc surface is greater than or equal to the radius of the stop stub.
  • the depth of the slot is greater than or equal to the radius of the stop stub.
  • the slot can limit the displacement of the stop stub when the relative rotation angle between the inner plate and the outer plate reaches to 180°; thus, the thick-plate hinge has better bearing performance, and is safer and more reliable
  • FIG. 1 is a front view of a thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 36°;
  • FIG. 2 is a rear view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 36°;
  • FIG. 3 is a left view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 36°;
  • FIG. 4 is a front view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 180°;
  • FIG. 5 is a front view of the thick-plate hinge for ladder jointing provided in the present invention, with the thick-plate hinge unfolded to 36°;
  • FIG. 6 is an enlarged view of portion A of the thick-plate hinge shown in FIG. 5 ;
  • FIG. 7 is a rear view of the thick-plate hinge for ladder jointing provided in the present invention, with the thick-plate hinge unfolded to 36°;
  • FIG. 8 is a front view of the thick-plat hinge for ladder jointing provided in the present invention, with the thick-plate hinge unfolded to 180°;
  • FIG. 9 is a schematic diagram of a ladder mounted with the thick-plate hinge for ladder jointing provided in the present invention in performance test, with the thick-plate hinge unfolded to 180°.
  • the present invention provides a thick-plate hinge 20 for ladder jointing, comprising an inner plate 21 and outer plates 22 that are folded on both outer sides of the inner plate, the inner plate 21 and outer plate 22 are relatively rotatable; the thick-plate joint lock 20 further comprises a positioning shaft sleeve 23 designed to lock up and position the inner plate 21 and outer plates 22 , the positioning shaft sleeve 23 is provided with a shaft 24 and a lock pin 25 , the outer plate 22 has a stop stub 26 fixed on it, and the inner plate 21 has a slot 27 that limits the displacement of the stop stub 26 .
  • the stop stub 26 will enter into the slot 27 entirely when the relative rotation angle between the inner plate 21 and the outer plate 22 reaches 180°.
  • the stop stub 26 is a cylindrical stub
  • the bottom surface of the slot 27 is an inwardly concaved arc surface
  • the outer circumferential surface of the stop stub 26 is tangentially fit the arc surface of the slot
  • the radius R of the arc surface of the slot 27 is greater than the radius of the stop stub 26 .
  • the depth H of the slot 27 is greater than the radius of the stop stub 26 .
  • Two thick-plate hinges 20 can be connected between an upper ladder section 31 and a lower ladder section 32 , so that the ladder can be transformed into a double-sided ladder (with 36° unfolding angle) or a long straight ladder (with 180° unfolding angle), to attain multiple purposes.
  • the ladder 30 that employs the thick-plate hinge 20 provided in the present invention will not be unfolded to an angle greater than 180°; therefore, the ladder has greatly improved bearing performance, and is safer and more reliable.

Abstract

A think plate type joint lock for ladder connection comprises an inner plate and an outer plate connected in a relatively rotating way, and a positioning shaft sleeve for locking the inner plate and the outer plate. In addition, a rotation limiting column is arranged on the outer plate, and a groove for resisting the limiting column is arranged on the inner plate. The limiting column and the groove restrict rotation of the inner plate relative to the outer plate, thus improving a load bearing capability and security of a ladder.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a structure member for ladder jointing, in particular to a thick-plate hinge for ladder jointing.
    • BACKGROUND OF THE INVENTION
  • In 1970s, an American Hal Wing designed and manufactured a telescopic multi-purpose ladder, which was commonly known as “Little Giant”. Through years of development, Little Giant ladders have taken the lead in the industry and are popular around the world.
  • A key technique of Little Giant ladders is the jointing part, called thick plate hinge that joints the upper ladder section and a lower ladder section. Please see FIG. 1-4. The thick-plate hinge 10 comprises an inner plate 11 and outer plates 12 that are folded on outer sides of the inner plate, the inner plate 11 and outer plate 12 are relatively rotatable; the thick-plate hinge 10 further comprises a positioning shaft sleeve 13 designed to lock up and position the inner plate 11 and outer plates 12, wherein, the positioning shaft sleeve 13 has a shaft 14 and a lock pin 15, the outer plate 12 has a stop stub 16 fixed on it, and the stop stub 16 butts against an outer arc surface 110 of the inner plate 11 when the relative rotation angle between the inner plate 11 and the outer plate 12 reaches 180°. The stop stub 16 can improves the bearing performance of the thick-plate hinge 10.
  • Via the positioning shaft sleeve 13, the inner plate 11 and outer plates 12 of the thick-plate hinge 10 can be locked up when they rotate to a preset angle in relation to each other, for example, the inner plate 11 and outer plates 12 can be locked up via the positioning shaft sleeve 13 when the unfolding angle is 0°, 36°, or 180°. With the structure described above, two thick-plate hinge 10 can be connected between an upper ladder section and a lower ladder section, so that the ladder can be transformed into a double-sided ladder (with 36° unfolding angle) or a long straight ladder (with 180° unfolding angle), to attain multiple purposes.
  • When the ladder is transformed into a straight ladder, both the inner plate and the outer plate of the two thick-plate hinges are unfolded to 180°. When tested in unexpected state or under specific conditions, e.g., tested as per the ladder standards of USA or that of Australia, the tested ladder must be able to bear the test load in a case that either thick-plate hinge work in fail state (the lock pin 15 is drawn out of the lock pin hole). In the prior art, in case either thick-plate hinge in fail state, though the thick-plate hinge still has some bearing capability obtained from the butting of the stop stub 16 and outer plate 12, the stop stub would have displacement on the outer arc surface, since the bearing surface of the inner plate that butts against the stop stub is arc surface; consequently, the bearing angle between the upper ladder section and the lower ladder section is greater than 180°; in addition, the higher the load is, the greater the displacement would be, and it lead to larger relative rotation angle between the inner plate and the outer plate. As a result, the overall bearing capacity of the ladder would be degrade, and the entire ladder is more possible to fail in the test. In that case, the solution in the prior art is to increase the strength of the thick-plate hinge or the strength of the entire ladder to improve the bearing capacity of the entire ladder, which would inevitably increase the cost of the entire ladder severely.
    • SUMMARY OF THE INVENTION
  • To overcome the drawbacks in the prior art, the present invention provides a new thick-plate hinge, which has better bearing performance and is safer and more reliable.
  • To attain the object described above, the present invention provides a thick-plate hinge for ladder jointing, comprising an inner plate and outer plates that are folded on both outer sides of the inner plate, the inner plate and outer plates are relatively rotatable; the thick-plate hinge further comprises a positioning shaft sleeve that is designed to lock up and position the inner plate and outer plates, and the outer plate has a stop stub fixed on it, wherein, the inner plate has a slot designed to limit the displacement of the stop stub, and the stop stub will enter into the slot partially or entirely when the relative rotation angle between the inner plate and the outer plate reaches 180°.
  • Preferably, the stop stub is a cylindrical stub, the bottom surface of the slot is an inwardly concaved arc surface, and the arc surface is tangentially fit the outer circumferential surface of the stop stub. More preferably, the radius of the arc surface is greater than or equal to the radius of the stop stub.
  • Preferably, the depth of the slot is greater than or equal to the radius of the stop stub.
  • With the technical solution described above, in the thick-plate hinge provided in the present invention, by providing the slot on the inner plate, the slot can limit the displacement of the stop stub when the relative rotation angle between the inner plate and the outer plate reaches to 180°; thus, the thick-plate hinge has better bearing performance, and is safer and more reliable
    • DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a front view of a thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 36°;
  • FIG. 2 is a rear view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 36°;
  • FIG. 3 is a left view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 36°;
  • FIG. 4 is a front view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 180°;
  • FIG. 5 is a front view of the thick-plate hinge for ladder jointing provided in the present invention, with the thick-plate hinge unfolded to 36°;
  • FIG. 6 is an enlarged view of portion A of the thick-plate hinge shown in FIG. 5;
  • FIG. 7 is a rear view of the thick-plate hinge for ladder jointing provided in the present invention, with the thick-plate hinge unfolded to 36°;
  • FIG. 8 is a front view of the thick-plat hinge for ladder jointing provided in the present invention, with the thick-plate hinge unfolded to 180°;
  • FIG. 9 is a schematic diagram of a ladder mounted with the thick-plate hinge for ladder jointing provided in the present invention in performance test, with the thick-plate hinge unfolded to 180°.
    •  DETAILED DESCRIPTION OF THE EMBODIMENTS
  • Thereinafter, a preferred embodiment of the present invention will be described in detail, with reference to the accompanying drawings.
  • Please see FIG. 5-8. The present invention provides a thick-plate hinge 20 for ladder jointing, comprising an inner plate 21 and outer plates 22 that are folded on both outer sides of the inner plate, the inner plate 21 and outer plate 22 are relatively rotatable; the thick-plate joint lock 20 further comprises a positioning shaft sleeve 23 designed to lock up and position the inner plate 21 and outer plates 22, the positioning shaft sleeve 23 is provided with a shaft 24 and a lock pin 25, the outer plate 22 has a stop stub 26 fixed on it, and the inner plate 21 has a slot 27 that limits the displacement of the stop stub 26.
  • Please see FIG. 8. The stop stub 26 will enter into the slot 27 entirely when the relative rotation angle between the inner plate 21 and the outer plate 22 reaches 180°.
  • In this embodiment, the stop stub 26 is a cylindrical stub, the bottom surface of the slot 27 is an inwardly concaved arc surface, the outer circumferential surface of the stop stub 26 is tangentially fit the arc surface of the slot, and the radius R of the arc surface of the slot 27 is greater than the radius of the stop stub 26. The depth H of the slot 27 is greater than the radius of the stop stub 26.
  • Please see FIG. 9. Two thick-plate hinges 20 can be connected between an upper ladder section 31 and a lower ladder section 32, so that the ladder can be transformed into a double-sided ladder (with 36° unfolding angle) or a long straight ladder (with 180° unfolding angle), to attain multiple purposes. When a ladder 30 mounted with the thick-plate hinges 20 provided in the present invention is unfolded to 180° and tested in ‘single joint lock test’, the ladder is obliquely supported on a vertical wall 40 at a certain angle, and then one thick-plate hinge 20 is manipulated to fail state (the lock pin 25 is drawn out of the lock hole); in that case, the function of the failed hinge is still able to assist the another thick-plate hinge effectively to bear the heavy load 50 hung on the upper section 31 of the tested ladder, since the stop stub 26 of the failed hinge enters into the slot 27.
  • Compared to the prior art, the ladder 30 that employs the thick-plate hinge 20 provided in the present invention will not be unfolded to an angle greater than 180°; therefore, the ladder has greatly improved bearing performance, and is safer and more reliable.
  • The above embodiments are provided only to elaborate the technical idea and features of the present invention so that those skilled in the art can understand the present invention and implement accordingly, instead of constituting any limitation to the scope of protection of the present invention. Any equivalent modification or embellishment made on the basis of the substantial spirit of the present spirit shall be deemed as falling into the scope of protection of the present invention.

Claims (8)

1-5. (canceled)
6. A thick-plate hinge for a ladder joint, comprising:
an inner plate having a slot,
an outer plate having a stop stub and rotatably connected to the inner plate, wherein the stop stub is configured to limit the rotation of the inner plate and the slot is configured to engage the stop stub, and
a positioning shaft sleeve in communication with the inner plate and the outer plate, wherein the position shaft sleeve has a locking pin and configured to lock the inner plate and the outer plate at a predetermined position.
7. The thick-plate hinge for a ladder joint according to claim 6 wherein the stop stub enters into the slot when the inner plate and the outer plate are in an unfolded position.
8. The thick-plate hinge for a ladder joint according to claim 6 wherein the stop stub is a column stub and the slot is an inwardly slot.
9. The thick-plate hinge for a ladder joint according to claim 8 wherein the stop stub is a cylindrical stub and the slot is an inwardly concaved arc slot.
10. The thick-plate hinge for a ladder joint according to claim 9 wherein the radius of the slot is greater than or equal to the radius of the stop stub.
11. The thick-plate hinge for a ladder joint according to claim 9 wherein the depth of the slot is greater than or equal to the radius of the stop stub.
12. The thick-plate hinge for a ladder joint according to claim 1 wherein the stop stub will enter into the slot at least partially when relative rotation angle between the inner plate and the outer plate reaches 180°.
US14/380,037 2013-01-18 2013-09-18 Thick plate type joint lock for ladder connection Abandoned US20150315844A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN2013200266468U CN203081279U (en) 2013-01-18 2013-01-18 Thick plate type joint lock for ladder connection
CN201320026646.8 2013-01-18
PCT/CN2013/083712 WO2014110913A1 (en) 2013-01-18 2013-09-18 Thick plate type joint lock for ladder connection

Related Parent Applications (1)

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PCT/CN2013/083712 A-371-Of-International WO2014110913A1 (en) 2013-01-18 2013-09-18 Thick plate type joint lock for ladder connection

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US15/479,076 Continuation US10487580B2 (en) 2013-01-18 2017-04-04 Thick plate type joint lock for ladder connection

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US14/380,037 Abandoned US20150315844A1 (en) 2013-01-18 2013-09-18 Thick plate type joint lock for ladder connection
US15/479,076 Active US10487580B2 (en) 2013-01-18 2017-04-04 Thick plate type joint lock for ladder connection

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US15/479,076 Active US10487580B2 (en) 2013-01-18 2017-04-04 Thick plate type joint lock for ladder connection

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CN (1) CN203081279U (en)
AU (1) AU2013373963B2 (en)
WO (1) WO2014110913A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9416591B2 (en) 2014-12-02 2016-08-16 Core Distribution, Inc. Telescoping ladder with stabilizers
US9580959B2 (en) * 2014-12-02 2017-02-28 Core Distribution, Inc. Foldable ladder
US20180252037A1 (en) * 2017-03-03 2018-09-06 New-Tec Integration (Xiamen) Co., Ltd. Deformable herringbone ladder with straight ladder function
US10233692B2 (en) * 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US10753149B2 (en) 2008-08-22 2020-08-25 Core Distribution, Inc. Extendable / retractable ladder
US20210025230A1 (en) * 2016-06-14 2021-01-28 Wing Enterprises, Incorporated Ladders, ladder hinges and related methods
US20210123302A1 (en) * 2019-10-24 2021-04-29 Core Distribution, Inc. Ladder tripod assembly and system
US11174678B2 (en) 2017-11-08 2021-11-16 Core Distribution, Inc. Locking assembly for a telescoping ladder

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203081279U (en) * 2013-01-18 2013-07-24 苗晓春 Thick plate type joint lock for ladder connection
US20180274296A1 (en) * 2017-03-21 2018-09-27 Tricam Industries, Inc. Adjustable hinge for a multi-position ladder
AU2018101665A4 (en) * 2017-11-07 2018-12-13 Wan Yu Chen Mechanical structure
USD935055S1 (en) * 2019-08-07 2021-11-02 Tricam Industries, Inc. Hinge for a multi-position ladder
USD966556S1 (en) 2019-12-13 2022-10-11 Murphy Ladder Llc Ladder
CN216767249U (en) * 2021-01-25 2022-06-17 江苏宙际杰智能科技股份有限公司 Multifunctional ladder joint
US20230383601A1 (en) * 2022-05-27 2023-11-30 Little Giant Ladder Systems, Llc Multifunction button for ladder adjustment
CN115405219A (en) * 2022-08-24 2022-11-29 苏州飞华铝制工业有限公司 Combined ladder

Family Cites Families (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1205411A (en) 1913-02-03 1916-11-21 Nat Lock Co Desk-fall support.
US1337817A (en) 1919-11-26 1920-04-20 Bode Robert Rudland Hinge for artificial legs
DE1775524C3 (en) 1968-08-23 1978-08-24 Otto 7067 Pluederhausen Mayer Self-locking joint
DE2101915C3 (en) 1971-01-15 1982-03-25 Mayer, Otto, 7063 Welzheim Lockable joint
FR2171732A5 (en) 1972-02-11 1973-09-21 Mayer Otto
CH551560A (en) 1972-04-11 1974-07-15 Kuemmerlin Walter ARTICULATED FITTINGS FOR FOLDING LADDERS.
US4027741A (en) 1976-07-15 1977-06-07 Shakespeare Company Locking hinge mechanism for a stepladder
FR2401356A1 (en) 1977-08-26 1979-03-23 Salanon Sa ARTICULATION FOR ARTICULATED STRUCTURE LIKELY TO BE LOCKED SELECTIVELY IN SEVERAL PREDETERMINED ANGULAR POSITIONS
US4157128A (en) 1977-12-22 1979-06-05 Jack Peters Self-locking hinge
US4403373A (en) 1980-02-15 1983-09-13 Kuemmerlin Walter Hinge fitting for foldable ladders
US4566150A (en) * 1981-12-21 1986-01-28 Little Giant Industries, Inc. Ladder hinge and multi-position locking mechanism therefor
US4407045A (en) 1981-12-21 1983-10-04 Boothe Leland H Ladder hinge and multi-position locking mechanism therefor
US4602889A (en) 1984-08-31 1986-07-29 Mu Shan Yeh Adjustable knuckle joint device for folding ladders
KR890003205Y1 (en) 1986-03-04 1989-05-17 주식회사 우경제작소 Assembly ladder hinge
US5058239A (en) * 1986-04-14 1991-10-22 Alfa Metal Corp. Fixing knuckles in foldable aluminum ladder
FR2603673B1 (en) 1986-09-05 1991-04-26 Rey Henri ARTICULATION ELEMENT FOR FOLDING SUPPORTS
US4773503A (en) 1987-09-11 1988-09-27 Robert L. Pease Ladder hinge
DE3737295A1 (en) * 1987-11-04 1989-05-18 Krause Werk Gmbh & Co Kg JOINT FOR LADDERS
US5954157A (en) 1994-10-18 1999-09-21 Fiberlite Technologies, Inc. Fiber/resin composite ladder and accompanying accessories
AU1405397A (en) 1997-01-21 1998-08-07 Shu Jin Jeremy Ong Multi-plates, multi-positions, self-locking, self-unlocking rotating hinge
US6353970B1 (en) 1999-11-10 2002-03-12 Estran Corporation Foldable seat hinge
US6397433B1 (en) 2000-04-03 2002-06-04 Shih-Ching Chen Knuckle assembly
EP1182322B1 (en) 2000-08-14 2006-11-15 Tom Yeh Hinge on ladder
US6688797B2 (en) * 2001-07-13 2004-02-10 Jae Yun Park Hinge for foldable ladders
US6711780B2 (en) 2001-08-22 2004-03-30 Sinclair Worldwide, Inc. Hinge for collapsible ladders
KR100458926B1 (en) * 2002-01-26 2004-12-03 주식회사 매직캔 Hinge for collapsible ladder
US7424933B2 (en) 2002-05-28 2008-09-16 Norman Miller Ladder assemblies
KR200317046Y1 (en) 2003-02-19 2003-06-25 이상규 Hinge apparatus of ladder
US20040216277A1 (en) 2003-05-01 2004-11-04 Jeffrey Beaver Hinge and locking assembly for center-folding ladder
US7140072B2 (en) 2003-11-11 2006-11-28 Cosco Management, Inc. Lockable ladder hinge
KR200349726Y1 (en) 2004-01-29 2004-05-12 주식회사 봉천 A safety member using a hinge device for collapse and spread ladder
US7100739B2 (en) 2004-05-14 2006-09-05 Werner Co. Step stool, hinge and method
US7093321B2 (en) 2004-06-07 2006-08-22 Cosco Management, Inc. Lockable hinge
CN2813867Y (en) * 2005-08-05 2006-09-06 天津市金锚科技发展有限公司 Improved floding ladder hinge device
US7984531B2 (en) 2005-09-23 2011-07-26 Restorative Care Of America Incorporated Rachet hinge for a knee or elbow orthosis
DE202006004076U1 (en) * 2006-03-13 2006-06-01 Fischer Ekw Gmbh & Co. Kg Locking joint, especially for positioning of back or foot section on sitting and lying furniture, has locking toothed ring concentric to joint axis fixed on first joint arm and in engaged position meshes with locking toothed ring element
CN201354583Y (en) * 2008-12-26 2009-12-02 苏州宝富轻工制品有限公司 Automatic ladder locking mechanism
GB2467529B (en) * 2009-01-30 2013-03-06 Hughes Safety Showers Ltd Frame for a shelter
US8381873B2 (en) 2009-07-28 2013-02-26 Affinity Tool Works Ladder and support stand
US8123298B2 (en) * 2009-09-10 2012-02-28 Friend Success, Inc. Hinge assembly for boat seat
US8591444B2 (en) 2010-06-25 2013-11-26 Djo, Llc Hinge for an orthopedic brace
US8550559B2 (en) 2010-11-24 2013-10-08 Everett Sollars Power disc style seat recliner
CN203081279U (en) * 2013-01-18 2013-07-24 苗晓春 Thick plate type joint lock for ladder connection

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10753149B2 (en) 2008-08-22 2020-08-25 Core Distribution, Inc. Extendable / retractable ladder
US9416591B2 (en) 2014-12-02 2016-08-16 Core Distribution, Inc. Telescoping ladder with stabilizers
US9580959B2 (en) * 2014-12-02 2017-02-28 Core Distribution, Inc. Foldable ladder
US10233692B2 (en) * 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US20190093428A1 (en) * 2014-12-02 2019-03-28 Core Distribution, Inc. Foldable ladder
US10731413B2 (en) * 2014-12-02 2020-08-04 Core Distribution, Inc. Foldable ladder
US20210025230A1 (en) * 2016-06-14 2021-01-28 Wing Enterprises, Incorporated Ladders, ladder hinges and related methods
US20180252037A1 (en) * 2017-03-03 2018-09-06 New-Tec Integration (Xiamen) Co., Ltd. Deformable herringbone ladder with straight ladder function
US10718160B2 (en) * 2017-03-03 2020-07-21 New-Tec Integration (Xiamen) Co., Ltd. Switchable ladder
US11174678B2 (en) 2017-11-08 2021-11-16 Core Distribution, Inc. Locking assembly for a telescoping ladder
US20210123302A1 (en) * 2019-10-24 2021-04-29 Core Distribution, Inc. Ladder tripod assembly and system
US11795760B2 (en) * 2019-10-24 2023-10-24 Core Distribution, Inc. Ladder tripod assembly and system

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US20170204663A1 (en) 2017-07-20
AU2013373963A1 (en) 2014-08-28
US10487580B2 (en) 2019-11-26
CN203081279U (en) 2013-07-24
WO2014110913A1 (en) 2014-07-24
AU2013373963B2 (en) 2016-01-07

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