EP1063387A2 - Echelle ayant un système de fermeture et son procédé de fabrication - Google Patents

Echelle ayant un système de fermeture et son procédé de fabrication Download PDF

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Publication number
EP1063387A2
EP1063387A2 EP99310087A EP99310087A EP1063387A2 EP 1063387 A2 EP1063387 A2 EP 1063387A2 EP 99310087 A EP99310087 A EP 99310087A EP 99310087 A EP99310087 A EP 99310087A EP 1063387 A2 EP1063387 A2 EP 1063387A2
Authority
EP
European Patent Office
Prior art keywords
ladder
rotating plates
plates
hinge holes
rotating
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Withdrawn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)
English (en)
Other versions
EP1063387A4 (fr
EP1063387A3 (fr
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/ko
Priority claimed from KR1019990048423A external-priority patent/KR20010045216A/ko
Application filed by Individual filed Critical Individual
Publication of EP1063387A2 publication Critical patent/EP1063387A2/fr
Publication of EP1063387A4 publication Critical patent/EP1063387A4/fr
Publication of EP1063387A3 publication Critical patent/EP1063387A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to a ladder having a locking device and a method for manufacturing the same. Specifically, the present invention relates to a ladder obviating separate engaging members needed for connecting hollows beams to hinge assemblies of the ladder and further comprising a locking device preventing the hinge assemblies from being released due to external forces while the ladder is spread for a certain angle for use. The present invention also relates to a method of manufacturing the same ladder
  • Fig. 1 is a schematic perspective view of a prior art ladder.
  • the ladder comprises a hinge assembly 6 composed of a pair of outer rotation plates 1 & 2, a pair of inner rotation plates 4 & 5 inserted rotatably between the outer rotation plates 1 & 2 and hinged by means of a fixing pin 3, and hollow beams 7 & 8 extending from the inner and outer rotation plates 1, 2, 4 & 5 to which foot plates (not shown) are attached.
  • through holes 11 & 12 for receiving rivets (or other engaging members) 9 & 10 are formed on the rotation plates 1, 2, 4 & 5.
  • through holes 13 & 14 are formed on the hollow beams 7 & 8 to which rivets 9 & 10 are inserted.
  • Fig. 2 is a schematic exploded view of a hinge assembly of the ladder according to the prior art
  • Fig. 3 is a schematic sectional view showing the locking state of the assembly.
  • the ladder comprises a hinge assembly A rotating freely when released, a pressing member B and a stopper member C.
  • the hinge assembly A comprises a pair of outer rotation plates 1 & 2, and a pair of inner rotation plates 4 & 5 inserted between the outer rotation plates 1 & 2 in a rotatable manner.
  • An elongated hole 19 connected to a hole 18 for receiving a stopper protrusion 16 of the stopper member C is formed on the outer rotation plates 1 & 2 of the hinge assembly A.
  • a through hole 20 for receiving a bush 15 supported by the stopper member C is formed at a center portion of the outer rotation plates 1 & 2.
  • a through hole 21, which receives the bush 15, is also formed at the center portion of the inner rotation plates 4 & 5.
  • a plurality of shaft hole 22 & 23 are formed on the inner rotation plates 1 & 2 at locations radially outward with regard to the through hole 21.
  • the pressing member B comprises a pressing plate 24 and a pressing shaft 25 connected to the plate 24.
  • a spring 26 is mounted on the pressing shaft 25.
  • Slider protrusions 30 & 31 with stopper shoulders 28 & 29 on the stopper protrusions 16 & 17 of right and left ends of the stopper handle 27 are protrudingly formed on the stopper member C which is secured to the pushing shaft 25 of the pressing portion B by means of a pin 32.
  • the pressing plate 24 of the pressing member B which causes the slider protrusions 30 of the stopper member C to reposition itself from the hole 18 to the elongated hole 19.
  • This enables the inner rotating plates 4 & 5 to rotate with respect to the outer rotating plates 1 & 2.
  • the stopper protrusions 16 & 17 repositions themselves into the holes of the plates.
  • the stopper protrusions 16 & 17 are of slanted form which enables a stable securing of the inner rotation plates 4 & 5 and the outer rotation plates 1 & 2.
  • the pressing plate 24 of the pressing portion B protrudes from the outer rotation plate 1 and is thereby exposed, when the pressing plate 24 of the pressing portion B is pressed in axial direction of the pressing shaft 25 occurring in occasions such as when contacting with external structures, the stopper member C is released from the hole 18 of the outer rotating plates 1 & 2. Therefore, the locking of the ladder is released, rendering the inner rotation plates 4 & 5 to rotate freely with respect to the outer rotation plates 1 & 2. Hence, exposing the user to dangers of accidental falls from the ladder.
  • a ladder with a locking device comprises, a pair of inner rotating plates with a plurality of hinge holes spaced apart for predetermined angles; a rotating plate with notch portions corresponding to the hinge holes, said rotating plate rotating on an outer surface of the inner rotating plates to selectively open the hinge holes; a resilient member biasing the rotating plate to an initial state of closing the hinge holes, one end of said resilient member secured to the rotating plate and the other end secured to the inner rotational plate; a pair of outer rotating plate with fixing holes formed on a side and supporting said inner rotating plates rotatably; and a locking key including a guide pin securing the rotating plate, inner rotating plates and outer rotating plates, and a fixing pin selectively inserted into the hinge holes, said locking key locking after spreading the ladder by rotating the inner rotating plates with respect to the outer rotating plates when the fixing pin is released from the hinge holes by pressing of a push cover.
  • a method of manufacturing a ladder with a locking device comprising, a first step of securing a pair of inner rotating plates into a symmetrical outer rotating plates in a hinged manner; a second step of forming a securing groove at left and right corners of the elongated portion of the pair of inner rotating plates and the rotating plates forming a hinge assembly; and a third step of engaging a mold with shape identical to the sectional shape of the elongated portion having the securing groove to an outer side of the beam to engross the corners of the beams to the securing groove by press working after securing the hollow beams to elongated portions.
  • the push cover is engrossed within a safety cover mounted on the outer rotating plate in order to prevent the locking key from being released and the ladder from spreading.
  • a slanted surface is formed at one side of the notch portion, and further comprises another slanted surface guiding said fixing pin of the fixing key sliding along the slanted surface to the hinge holes when the fixing pin is released to spread the ladder.
  • said hinge holes are formed at 40, 105 and 180 degrees and the inner rotating plates being rotated with respect to the outer rotating plates and locked thereto at said angles.
  • a stopper is provided which configures the engaging location of the beam to the outer rotating plates and the inner rotating plates.
  • FIG. 1 is a schematic perspective view showing a ladder according to the prior art.
  • FIG. 2 is a schematic drawing showing a hinge assembly of the ladder according to the prior art.
  • FIG. 3 is a schematic sectional view showing the use of the locking device of Fig. 2.
  • FIG. 4 is a schematic exploded view of the locking portions of the ladder comprising a locking device according to the present invention.
  • Fig. 5 shows a ladder according to the present invention assembled.
  • Fig. 6a & 6b is a schematic view showing the locking device according to the present invention locked and released.
  • Fig. 7 shows the ladder including a locking device being used.
  • Fig. 8 is a flow chart showing a method of manufacturing the ladder with the locking device according to the present invention.
  • Fig. 9 is a sectional view of the connecting portion of the hinge assembly and the hollow beams according to the present invention.
  • an embodiment according to the present invention comprises a pair of symmetric inner rotation plates 102 & 103 where a plurality of hinge holes are formed at 40 degrees, 105 degrees and 180 degrees locations, and a pair of outer rotating plates 109 & 110 where a fixing hole is formed on a location corresponding to the hinge holes and a engaging hole 111 is formed at a center portion thereof.
  • the outer rotating plates 109 & 110 support the inner rotating plates 102 & 103 in a rotatable manner.
  • the embodiment further comprises a rotating plate 106 and a resilient member 107.
  • a rotating plate 106 On the rotating plate 106, a fixing hole 104, notch portions 105 corresponding to the hinge holes 101 are formed.
  • the rotating plate 106 selectively opens the hinge holes 101 and is rotatably mounted on the outer surface of the inner rotating plate 102.
  • One end of the resilient member 107 is fixed onto the rotating plate 106 while the other end is fixed to the inner rotating plate 102, thereby resiliently biasing the rotating plate 106 to close the hinge holes 101 when external force is not exerted.
  • a guide pin 112 fixing the inner and outer rotating plates 109 & 110 and the rotating plate 106 and a fixing key 114 are provided.
  • the guide pin 112 comprises a fixing pin 113.
  • the fixing key 114 fixes the ladder after it rotates by moving the inner rotating plates 102 & 103 with respect to the outer rotating plates 109 & 110 when the fixing pin 113 is released from the hinge holes 101 by pressing a push cover 115 provided at one end of the guide pin 112.
  • the push cover 115 is engrossed in a safety cover 116 mounted on the outer rotating plate 109.
  • the reference numerals 117 & 118 denotes beams connected to lower portions of the inner and outer rotating plates 102, 103, 109 & 110 while the reference numeral 119 denotes a rivet securing the outer rotating plates 109 & 110.
  • the reference numeral 120 denotes a locking knob which shows the user if the locking key 121 is in a locked or a released state.
  • the reference numeral 114 denotes a resilient member securing the fixing key 114.
  • a pair of outer rotating plates 109 & 110 and inner rotating plates 102 & 103 which form the hinge assembly are bent in symmetrical manner(S10).
  • the inner rotating plates 102 & 103 are inserted and fixed so that they can make relative rotations(S20).
  • Fixing grooves 102b, 103b, 109b & 110b are formed on the left and right corners of the extending portions 102a & 103a of the inner rotating plates 102 & 103 and the extending portions 109a & 110a of the outer rotating plates 109 & 110(S20).
  • press molds(not shown) having identical shape as the sectional shape of the extended portions 102a, 103a, 109a & 110a with fixing grooves 102b, 103b, 109b & 110b are placed at sides of the beams 117 & 118(S40).
  • the corners of the beams 117 & 118 are engrossed within the fixing holes 102b, 103b, 109b & 110b(S50).
  • the method according to the present invention does not require any rivet or bolt to secure the hollow beams 117 & 118 to the inner rotating plates 102 & 103 and outer rotating plates 109 & 110.
  • the ladder is initially collapsed for storing when not in use.
  • the fixing pin 113 of the fixing key 114 is inserted into the hinge hole 101 a on the inner rotating plates 102 & 103.
  • the front end of the fixing pin 113 is located at upper surface of the rotating plate 106 which enables the inner rotating plates 102 & 103 to rotate with respect to the outer rotating plates 109 & 110.
  • the locking pin 113 rotates along the upper surface of the rotating plate 106 and slides into the hinge holes 101b along the slanted surface 105a of the notch portion 105.
  • releasing of the fixing pin 113 of the fixing key 114 from the hinge hole 101b is prevented by the resilient force of the resilient member 121 provided on the fixing pin 113. That is, the locking key 114 locks the inner rotating plates 102 & 103 and the outer rotating plates 109 & 110 at 40 degrees.
  • the push button 115 releasing the fixing key 114 from the locking state is engrossed within the safety cover 116 mounted on the outer rotating plate 109, the locking of the locking key 114 can be maintained. That is, when the user is operating on the ladder, the releasing of the fixing key 114 due to external force is prevented, thereby preventing accidents.
  • the locking of the hinge assembly due to external force is prevented, thereby preventing the safety accidents.
  • intentional control of the locking and releasing of the assembly is easy, facilitating the use of the ladder.

Landscapes

  • Ladders (AREA)
EP99310087A 1999-06-22 1999-12-15 Echelle ayant un système de fermeture et son procédé de fabrication Withdrawn EP1063387A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR9923544 1999-06-22
KR1019990023544A KR20010003302A (ko) 1999-06-22 1999-06-22 사다리의 조립방법
KR1019990048423A KR20010045216A (ko) 1999-11-03 1999-11-03 로킹기능이 구비된 사다리
KR9948423 1999-11-03

Publications (3)

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

Family

ID=26635519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99310087A Withdrawn EP1063387A3 (fr) 1999-06-22 1999-12-15 Echelle ayant un système de fermeture et son procédé de fabrication

Country Status (1)

Country Link
EP (1) EP1063387A3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008052433A1 (fr) * 2006-10-31 2008-05-08 Zhengping Su Structure de raccordement pour échelles
WO2023230368A1 (fr) * 2022-05-27 2023-11-30 Little Giant Ladder Systems, Llc Bouton multifonction pour réglage d'échelle

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 (de) * 1990-10-11 1992-04-16 Rauschenberger Metallwaren Gmb Gelenk, insbesondere zur verbindung der leiterholme einer zusammenklappbaren mehrzweckleiter

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 (de) * 1990-10-11 1992-04-16 Rauschenberger Metallwaren Gmb Gelenk, insbesondere zur verbindung der leiterholme einer zusammenklappbaren mehrzweckleiter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008052433A1 (fr) * 2006-10-31 2008-05-08 Zhengping Su Structure de raccordement pour échelles
WO2023230368A1 (fr) * 2022-05-27 2023-11-30 Little Giant Ladder Systems, Llc Bouton multifonction pour réglage d'échelle

Also Published As

Publication number Publication date
EP1063387A4 (fr) 2001-06-13
EP1063387A3 (fr) 2001-08-01

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