EP3520921A1 - Procédé de fabrication d'un barreau d'échelle antidérapant et barreau d'échelle - Google Patents

Procédé de fabrication d'un barreau d'échelle antidérapant et barreau d'échelle Download PDF

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Publication number
EP3520921A1
EP3520921A1 EP19153859.4A EP19153859A EP3520921A1 EP 3520921 A1 EP3520921 A1 EP 3520921A1 EP 19153859 A EP19153859 A EP 19153859A EP 3520921 A1 EP3520921 A1 EP 3520921A1
Authority
EP
European Patent Office
Prior art keywords
rung
antislip
roughening
tubular
punching
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.)
Granted
Application number
EP19153859.4A
Other languages
German (de)
English (en)
Other versions
EP3520921B1 (fr
Inventor
Reijo Vuorenmaa
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.)
Piristeel Oy
Original Assignee
Piristeel Oy
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 Piristeel Oy filed Critical Piristeel Oy
Priority to PL19153859T priority Critical patent/PL3520921T3/pl
Publication of EP3520921A1 publication Critical patent/EP3520921A1/fr
Application granted granted Critical
Publication of EP3520921B1 publication Critical patent/EP3520921B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/28—Perforating, i.e. punching holes in tubes or other hollow bodies
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/08—Special construction of longitudinal members, or rungs or other treads
    • E06C7/081—Rungs or other treads comprising anti-slip features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/28—Perforating, i.e. punching holes in tubes or other hollow bodies
    • B21D28/285—Perforating, i.e. punching holes in tubes or other hollow bodies punching outwards

Definitions

  • the present invention relates to method of manufacturing an antislip ladder rung. Further, the invention relates to an antislip ladder rung.
  • Document KR20160124706 discloses a ladder rung which prevents a slip.
  • the method comprises a step of forming a rolled pipe, and a step of forming an uneven portion on an outer circumference of the rolled pipe.
  • the uneven portion comprises a plurality of corrugations which are made to the wall of the tubular rung. The problem is that the corrugations do not provide a very good grip to prevent slipping.
  • the objective of the invention is to alleviate the disadvantages mentioned above.
  • the present invention provides a method of manufacturing an antislip ladder rung.
  • the method comprises steps of arranging a tubular rung made of sheet metal, and arranging an antislip roughening to the rung.
  • the method comprising a step of punching the tubular rung in the diametral plane of the rung with a pressing punch having a plurality of spaced puncturing rods with pointed tips, said puncturing rods being arranged in a row, and that during the punching stroke, at a first side of the rung the pointed tips puncture through the wall of the rung forming inlet openings and at the opposite second side of the rung the pointed tips create protrusions that form the antislip roughening.
  • the punching stroke is adjusted so that, at the opposite second side of the rung, the pointed tips press permanent deformations as outwardly protruding bulges to the wall of the rung without tearing the wall, the bulges forming the antislip roughening.
  • the punching stroke is adjusted so that, at the opposite second side of the rung, the pointed tips puncture through the wall of the rung to form outwardly protruding punctured openings having torn edges forming the antislip roughening.
  • the method comprises punching the tubular rung in the diametral plane of the rung simultaneously with two pressing punches having punching strokes directed to mutually in opposite directions whereby the antislip roughening is created simultaneously to opposite sides of the rung.
  • the rung is rotated about its longitudinal axis to a different position relative to the pressing punch and a second punching stroke is performed.
  • the rung is rotated about its longitudinal axis an angle of 120° in one direction and a second punching stroke is performed.
  • the rung is turned again about its longitudinal axis an angle of 120° in the same direction as previously and a third punching stroke is performed.
  • the step of arranging a tubular rung made of sheet metal comprises folding a planar piece of sheet metal to tubular form, so that opposite edges of sheet metal abut each other, and welding abutting longitudinal edges together to form a tubular rung having a tubular cross-section.
  • punching is performed with puncturing rods which have a diameter of 4 mm, the tip end of the pointed tip having a diameter of 0,4 mm and the pointed tip having a cone angle of 48,5°.
  • the present invention provides an antislip ladder rung, the rung being made of sheet metal and having a tubular form with a circular cross-section, the rung comprising an antislip roughening.
  • the antislip roughening comprises, at a second side of the rung, a plurality of outwardly protruding from the inside of the rung outwardly pressed deformations as protrusions deformed from the material of the wall of the rung, and at a first side opposite to the second side of the rung, inlet openings, the inlet openings and protrusions being formed in manufacturing when puncturing through the tubular rung.
  • the protrusions deformed from the material of the wall of the rung are outwardly protruding bulges and/or edges of outwardly punctured openings in the wall of the rung.
  • Figure 1 shows an antislip ladder rung 1 for a ladder.
  • the ladder rung 1 is made of sheet metal, such as sheet steel.
  • the rung 1 has a tubular form with a circular cross-section.
  • the rung 1 comprises an antislip roughening 2.
  • the antislip roughening 2 provides a good grip for hands and feet while climbing the ladder.
  • One embodiment of the ladder is shown in Figure 2 .
  • Such a ladder can be used as a wall ladder or as a roof ladder, or part thereof, to provide safe access to roofs, the ridge of roofs, chimneys, roof hatches and other targets that require maintenance.
  • the antislip roughening 2 comprises a plurality of outwardly protruding, from the inside of the rung outwardly pressed, deformations. They are protrusions, such as bulges 6 1 (see Figure 7 ) or 6 2 edges of punctures (see Figures 1 and 3 ) which are deformed from the material of the wall of the rung 1 without
  • the wall thickness s of the tubular rung 1 is preferably 1,25 mm and diameter d is 25 mm.
  • the protrusions 6 2 have a height e of 2 mm.
  • Figure 3 also shows inlet openings 5 in the wall of the rung. These inlet openings 5 are at the opposite second side of the rung relative to the first side of the protrusions 6 2 , and are formed by the puncturing rods 4 when puncturing through the rung 1 in manufacturing (see Figures 4 - 7 ).
  • Figure 3 shows that protrusions 6 2 may be distributed on the circumference of the rung 1 as circumferential groups of three protrusions in each group wherein the protrusions are arranged at intervals of 120° around the periphery of the rung. A plurality of such groups are arranged along the length of the rung 1.
  • Figure 1 shows an embodiment of the rung 1 wherein twelve successive circumferential groups of protrusions are arranged so that an area free of protrusions is arranged in the middle area of the rung 1.
  • the circumferential groups of protrusions are equally spaced by a distance l being 25 mm.
  • Figures 4 - 7 schematically show the principle of the method for manufacturing the antislip ladder rung 1 of Figure 1 .
  • a tubular rung 1 made of sheet metal is arranged.
  • the step of arranging a tubular rung 1 made of sheet metal may comprise folding a planar piece of sheet metal to tubular form m(not shown in Figures), so that opposite edges of sheet metal abut each other. The abutting longitudinal edges are welded together to form a tubular rung having a tubular cross-section.
  • Figures 4 and 5 show arranging the antislip roughening 2 to the rung 1.
  • the method step of arranging the antislip roughening 2 comprises a step of punching the tubular rung 1 in the diametral plane of the rung 1 with a pressing punch 3 1 , 3 2 .
  • the pressing punch 3 1 , 3 2 comprises a plurality of spaced puncturing rods 4 with pointed tips.
  • the puncturing rods 4 are arranged in a row. During the punching stroke, at a first side of the rung the pointed tips puncture through the wall of the rung forming inlet openings 5 and at the opposite second side of the rung the pointed tips create protrusions 6 1 and/or 6 2 that form the antislip roughening 2.
  • the punching stroke may be adjusted so that, at the opposite second side of the rung 1, the pointed tips press permanent deformations as outwardly protruding bulges 6 1 to the wall of the rung without tearing the wall as is illustrated in Figure 7 .
  • the punching stroke may also be adjusted so that, at the opposite second side of the rung 1, the pointed tips of the puncturing rod 4 puncture through the wall of the rung 1 to form outwardly protruding punctured openings having torn edges 6 2 forming the antislip roughening, as shown in Figure 6 .
  • Figures 4 and 5 show punching the tubular rung 1 in the diametral plane of the rung 1 simultaneously with two pressing punches 3 1 , 3 2 having punching strokes directed to mutually in opposite directions whereby the antislip roughening is created simultaneously to opposite sides of the rung 1.
  • a first punching stroke the rung 1 may be rotated about its longitudinal axis to a different position and a second punching stroke is performed.
  • a first punching stroke the rung 1 is rotated about its longitudinal axis an angle of 120° in one direction and a second punching stroke is performed.
  • the rung is rotated again about its longitudinal axis an angle of 120° in the same direction as previously, and a third punching stroke is performed.
  • punching is performed with puncturing rods 4 which have a diameter D of 4 mm.
  • the tip end of the pointed tip of the puncturing rod 4 has a diameter ⁇ of 0,4 mm and the pointed tip has a cone angle ⁇ of 48,5°.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
EP19153859.4A 2018-02-01 2019-01-28 Procédé de fabrication d'un barreau d'échelle antidérapant et barreau d'échelle Active EP3520921B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL19153859T PL3520921T3 (pl) 2018-02-01 2019-01-28 Sposób wytwarzania antypoślizgowego szczebla drabiny i szczebel drabiny

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20185092A FI128707B (en) 2018-02-01 2018-02-01 Method for producing a non-slip stick for a ladder and a stick for a ladder

Publications (2)

Publication Number Publication Date
EP3520921A1 true EP3520921A1 (fr) 2019-08-07
EP3520921B1 EP3520921B1 (fr) 2020-09-30

Family

ID=65236932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19153859.4A Active EP3520921B1 (fr) 2018-02-01 2019-01-28 Procédé de fabrication d'un barreau d'échelle antidérapant et barreau d'échelle

Country Status (5)

Country Link
EP (1) EP3520921B1 (fr)
DK (1) DK3520921T3 (fr)
FI (1) FI128707B (fr)
LT (1) LT3520921T (fr)
PL (1) PL3520921T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3878570A1 (fr) * 2020-03-09 2021-09-15 Nesco Oy Procédé et appareil de formation d'une pièce tubulaire, pièce tubulaire et échelle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761336A1 (fr) * 1995-09-06 1997-03-12 Behr GmbH & Co. Méthode et appareil de fabrication d'un collecteur
DE202007014746U1 (de) * 2007-10-19 2008-02-28 Heinz, Richard Leitersprosse
WO2008146818A1 (fr) * 2007-05-28 2008-12-04 Mitsubishi Heavy Industries, Ltd. Procédé de préparation de trous traversants dans des surfaces de paroi de corps de tube, et structure de corps de tube
WO2011043314A1 (fr) * 2009-10-08 2011-04-14 日本化薬株式会社 Procédé de fabrication de tuyau perforé pour générateur de gaz, et générateur de gaz
JP2011231496A (ja) * 2010-04-26 2011-11-17 Ito Co Ltd 梯子用滑り止め具と梯子
KR20120000413U (ko) * 2010-07-08 2012-01-16 정성한 사다리용 안전 발판
KR20160124706A (ko) * 2015-04-20 2016-10-28 김태조 사다리 발판 요철성형 방법

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761336A1 (fr) * 1995-09-06 1997-03-12 Behr GmbH & Co. Méthode et appareil de fabrication d'un collecteur
WO2008146818A1 (fr) * 2007-05-28 2008-12-04 Mitsubishi Heavy Industries, Ltd. Procédé de préparation de trous traversants dans des surfaces de paroi de corps de tube, et structure de corps de tube
DE202007014746U1 (de) * 2007-10-19 2008-02-28 Heinz, Richard Leitersprosse
WO2011043314A1 (fr) * 2009-10-08 2011-04-14 日本化薬株式会社 Procédé de fabrication de tuyau perforé pour générateur de gaz, et générateur de gaz
JP2011231496A (ja) * 2010-04-26 2011-11-17 Ito Co Ltd 梯子用滑り止め具と梯子
KR20120000413U (ko) * 2010-07-08 2012-01-16 정성한 사다리용 안전 발판
KR20160124706A (ko) * 2015-04-20 2016-10-28 김태조 사다리 발판 요철성형 방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3878570A1 (fr) * 2020-03-09 2021-09-15 Nesco Oy Procédé et appareil de formation d'une pièce tubulaire, pièce tubulaire et échelle

Also Published As

Publication number Publication date
EP3520921B1 (fr) 2020-09-30
DK3520921T3 (da) 2020-12-21
PL3520921T3 (pl) 2021-04-06
LT3520921T (lt) 2021-01-11
FI20185092A1 (en) 2019-08-02
FI128707B (en) 2020-10-30

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