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EP1063387A3 - Ladder having locking device and method for manufacturing the same - Google Patents

Ladder having locking device and method for manufacturing the same Download PDF

Info

Publication number
EP1063387A3
EP1063387A3 EP99310087A EP99310087A EP1063387A3 EP 1063387 A3 EP1063387 A3 EP 1063387A3 EP 99310087 A EP99310087 A EP 99310087A EP 99310087 A EP99310087 A EP 99310087A EP 1063387 A3 EP1063387 A3 EP 1063387A3
Authority
EP
European Patent Office
Prior art keywords
ladder
rotating plates
hinge holes
rotating
hinge
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.)
Withdrawn
Application number
EP99310087A
Other languages
German (de)
French (fr)
Other versions
EP1063387A4 (en
EP1063387A2 (en
Inventor
Ik Woo Lee
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.)
Individual
Original Assignee
Individual
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
Priority claimed from KR1019990023544A external-priority patent/KR20010003302A/en
Priority claimed from KR1019990048423A external-priority patent/KR20010045216A/en
Application filed by Individual filed Critical Individual
Publication of EP1063387A2 publication Critical patent/EP1063387A2/en
Publication of EP1063387A4 publication Critical patent/EP1063387A4/en
Publication of EP1063387A3 publication Critical patent/EP1063387A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Ladders (AREA)

Abstract

A ladder with a locking device comprises a pair of inner rotating plates (102, 103) provided with a plurality of hinge holes spaced apart at predetermined angles; a rotating plate (106) with notch portions (105) corresponding to the hinge holes, said rotating plate rotating on an outer surface of the inner rotating plates (102, 103) to selectively open the hinge holes; a resilient member (107) biasing the rotating plate (106) to an initial state of closing the hinge holes, one end of said resilient member (107) being secured to the rotating plate (106) and the other end secured to one of the inner rotating plates (102); a pair of outer rotating plates (109, 110) with fixing holes formed on one side and supporting said inner rotating plates (102, 103) rotatably; and a locking key (114) including a guide pin (112) for securing the rotating plate (106), inner rotating plates (102, 103) and outer rotating plates (109, 110), and a fixing pin (113) for selective insertion into the hinge holes, said locking key (114) being adapted to lock after the ladder has been spread by rotating the inner rotating plates (102, 103) with respect to the outer rotating plates (109, 110), this being possible when the fixing pin (113) has been released from the hinge holes by the pressing of a push cover (115). The releasing of the hinge assembly due to an external force is prevented, thereby preventing accidents whilst facilitating the use of the ladder by enabling easy control of the locking and releasing of the assembly. Furthermore, the number of operations for assembling the ladder is reduced, thereby increasing the workability. Also, clearance between hollow beams of the ladder and the hinge assembly is obviated, thereby increasing the durability of the ladder. Furthermore, the number of parts for assembling the ladder is reduced, which in turn reduces the cost for manufacturing the ladder considerably.
EP99310087A 1999-06-22 1999-12-15 Ladder having locking device and method for manufacturing the same Withdrawn EP1063387A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR9923544 1999-06-22
KR1019990023544A KR20010003302A (en) 1999-06-22 1999-06-22 Assembling method of a ladder
KR9948423 1999-11-03
KR1019990048423A KR20010045216A (en) 1999-11-03 1999-11-03 ladder of having a locker

Publications (3)

Publication Number Publication Date
EP1063387A2 EP1063387A2 (en) 2000-12-27
EP1063387A4 EP1063387A4 (en) 2001-06-13
EP1063387A3 true EP1063387A3 (en) 2001-08-01

Family

ID=26635519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99310087A Withdrawn EP1063387A3 (en) 1999-06-22 1999-12-15 Ladder having locking device and method for manufacturing the same

Country Status (1)

Country Link
EP (1) EP1063387A3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200975210Y (en) * 2006-10-31 2007-11-14 苏正平 Connection structure of ladder
GB2633961A (en) * 2022-05-27 2025-03-26 Little Giant Ladder Systems Llc Multifunction button for ladder adjustment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4666327A (en) * 1986-09-22 1987-05-19 George Su Joint for foldable aluminum ladders
US4770559A (en) * 1987-03-31 1988-09-13 Myung Ho Kim Positioning joint for folding ladders
DE4032283A1 (en) * 1990-10-11 1992-04-16 Rauschenberger Metallwaren Gmb Ratchet pivot linkage for adjustable seat-back etc. - uses spring loaded ratchet element and rotatable control element blocking selected ratchet positions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4666327A (en) * 1986-09-22 1987-05-19 George Su Joint for foldable aluminum ladders
US4770559A (en) * 1987-03-31 1988-09-13 Myung Ho Kim Positioning joint for folding ladders
DE4032283A1 (en) * 1990-10-11 1992-04-16 Rauschenberger Metallwaren Gmb Ratchet pivot linkage for adjustable seat-back etc. - uses spring loaded ratchet element and rotatable control element blocking selected ratchet positions

Also Published As

Publication number Publication date
EP1063387A4 (en) 2001-06-13
EP1063387A2 (en) 2000-12-27

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Effective date: 20020202