NO138541B - DEVICE FOR STEP MOUNTING FOR LADDER. - Google Patents
DEVICE FOR STEP MOUNTING FOR LADDER. Download PDFInfo
- Publication number
- NO138541B NO138541B NO761689A NO761689A NO138541B NO 138541 B NO138541 B NO 138541B NO 761689 A NO761689 A NO 761689A NO 761689 A NO761689 A NO 761689A NO 138541 B NO138541 B NO 138541B
- Authority
- NO
- Norway
- Prior art keywords
- sleeve
- grooves
- groove
- corners
- elevations
- Prior art date
Links
- 239000000463 material Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 description 3
- 238000007373 indentation Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/08—Special construction of longitudinal members, or rungs or other treads
- E06C7/082—Connections between rungs or treads and longitudinal members
- E06C7/085—Connections between rungs or treads and longitudinal members achieved by deforming the rung or the stile
-
- 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
- E06C7/082—Connections between rungs or treads and longitudinal members
- E06C7/087—Connections between rungs or treads and longitudinal members with a connecting piece installed around the rung
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
- Programmable Controllers (AREA)
Description
Foreliggende oppfinnelse angår en anordning ved trirmfeste for The present invention relates to a device for trim attachment for
stige, dvs. forbindelsen mellom stigens trinn og vanger. ladder, i.e. the connection between the ladder's rungs and rungs.
Anordningen er anvendbar for stiger av metall, og.er særlig The device is applicable for ladders made of metal, and is particularly
aktuell for aluminiumstiger. applicable for aluminum ladders.
Nærmere bestemt angår oppfinnelsen en anordning ved trinnfeste More specifically, the invention relates to a device for step attachment
der trinnenesender er ført gjennom hull i en plateformet del av vangen som står hovedsakelig vinkelrett på trinnenes lengderetning. where the ends of the steps are led through holes in a plate-shaped part of the vang which is mainly perpendicular to the longitudinal direction of the steps.
US-patent nr. 3.039.186 viser et eksempel på en slik anordning samt en fremgangsmåte for fremstilling av trinnfestet. US patent no. 3,039,186 shows an example of such a device as well as a method for producing the step attachment.
I følge patentet er en hylse anbrakt mellom trinnenden og et According to the patent, a sleeve is placed between the step end and a
hull i vangen. Ved bruk av presseverktøy er hylsen presset i trinnets lengderetning slik at materiale i hylsen har flytt ut over hullkanten og derved blitt forankret i hullet. Dessuten har pressingen bevirket at hylsen er trykket hardt mot trinnet, hole in the cage. When using a press tool, the sleeve is pressed in the longitudinal direction of the step so that material in the sleeve has flowed out over the edge of the hole and thereby become anchored in the hole. Furthermore, the pressing has caused the sleeve to be pressed hard against the step,
og fortrinnsvis forårsaket en viss inntrykking av trinnets vegg rundt trinnets omkrets. Det er da forutsatt at trinnet er et hulprofil. Inntrykningen og hylsens friksjon mot trinnet gir således en viss forankring av trinnet i hylsen. and preferably caused some indentation of the wall of the step around the circumference of the step. It is then assumed that the step is a hollow profile. The indentation and the sleeve's friction against the step thus provide a certain anchoring of the step in the sleeve.
Forsøk har vist at den sistnevnte forankring kan bli mangelfull. Experiments have shown that the latter anchoring can be deficient.
Det viser seg at forbindelsen er utilstrekkelig holdbar når stigen utsettes for visse påkjenninger. Slike påkjenninger kan være de som oppstår ved vanlig bruk av stigen, f.eks. belastning av trinnene og støt mot vangeendene ved f.eks. plassering av stigen på underlaget. Trinnfestene fremstilt i følge US-patent nr. 3.039.186 viser da en tendens til å miste sin stivhet etter en tids bruk. It turns out that the connection is insufficiently durable when the ladder is subjected to certain stresses. Such stresses can be those that occur during normal use of the ladder, e.g. load on the steps and impact on the wall ends by e.g. placement of the ladder on the substrate. The step fasteners produced according to US patent no. 3,039,186 then show a tendency to lose their stiffness after a period of use.
Hovedformålet med foreliggende oppfinnelse er å komme frem til The main purpose of the present invention is to arrive at
et trinnfeste som er mere stabilt enn et trinnfeste i følge US-patent nr. 3.039.186. Oppfinnelsen utgjør en forbedring av a step mount that is more stable than a step mount according to US patent no. 3,039,186. The invention constitutes an improvement of
det prinsipp som fremgår av US-patentet. the principle stated in the US patent.
I henhold til oppfinnelsen er dette oppnådd ved at minst en rille er anordnet rundt trinnenden, og at materiale i hylsen er presset inn i rillen eller rillene. According to the invention, this is achieved by at least one groove being arranged around the step end, and that material in the sleeve is pressed into the groove or grooves.
Det har vist seg at en eller flere slike riller i trinnet gir It has been shown that one or more such grooves in the step give
en vesentlig øket stabilitet for stigen. Ved at hylsemateriale presses inn i en fortrinnsvis noe skarpkantet rille, oppnås en forankring av en helt annen karakter enn den som oppnås ved fremgangsmåten i følge US-patent nr. 3.039.186. Vesensforskjellen er at i følge foreliggende oppfinnelse er forbindelsen mellom hylse og trinn slik at det trengs en vesentlig deformasjon av hylsematerialet for at forbindelsen skal løsne, mens det ved en anordning som i US-patentet hovedsaklig er en friksjonsforbindelse. a significantly increased stability for the ladder. By pressing sleeve material into a preferably somewhat sharp-edged groove, an anchoring of a completely different character is achieved than that achieved by the method according to US patent no. 3,039,186. The essential difference is that, according to the present invention, the connection between sleeve and step is such that a significant deformation of the sleeve material is needed for the connection to loosen, whereas with a device such as that in the US patent it is mainly a frictional connection.
I følge en foretrukket utførelsesform av oppfinnelsen forløper rillen eller rillene i det vesentlige kun i langsgående forhøyninger i trinnets ytterflate. Dette har fordeler fremfor en mere nærliggende løsning, nemlig den at trinnet gjøres sirkulært i tverrsnitt og med så stor veggtykkelse at trinnenden kan utstyres med minst en rille med tilstrekkelig dybde, uten at trinnenden svekkes utillatelig. Dette ville tilsi at trinnet ble unormalt tykkvegget, med unødig materialforbruk i forhold til hva som er nødvendig av hensyn til trinnets bøyestivhet. According to a preferred embodiment of the invention, the groove or grooves essentially run only in longitudinal elevations in the outer surface of the step. This has advantages over a closer solution, namely that the step is made circular in cross-section and with such a large wall thickness that the step end can be equipped with at least one groove of sufficient depth, without the step end being unacceptably weakened. This would mean that the step was abnormally thick-walled, with unnecessary material consumption in relation to what is necessary in view of the step's bending stiffness.
I det tilfelle at trinnets ytterflate i tverrsnitt er en mangekant, kan rillen eller rillene ha en slik dybde at den eller de forløper i mangekantens hjørner, fortrinnsvis slik at rillen eller rillene ikke når ned i midtpartiet mellom nabohjørner. In the event that the outer surface of the step in cross-section is a polygon, the groove or grooves can have such a depth that it or they run in the corners of the polygon, preferably so that the groove or grooves do not reach down into the middle part between neighboring corners.
Ifølge oppfinnelsen kan det anvendes en hylse i form av en mangekant, idet antall kanter tilsvarer antall forhøyninger i trinnet, og slik at trinnets forhøyninger befinner seg umiddelbart innenfor hylsens hjørner. According to the invention, a sleeve in the form of a polygon can be used, the number of edges corresponding to the number of elevations in the step, and so that the elevations of the step are located immediately within the corners of the sleeve.
Med henvisning til tegningene skal eksempler på utførelse av oppfinnelsen beskrives nærmere. Fig. 1 viser et snitt gjennom en stigevange 2, der enden av et trinn 1 er festet i et hull i vangen 2 ved hjelp av en hylse 3. Hylsen 3 er anbrakt mellom trinnenden 1 og hullkanten 4 og presset, hovedsakelig aksialt. På trinnenden 1 er anordnet rundt-gående riller 5, og ved pressing av hylsen 3 har materialet i hylsen 3 flytt inn i rillene 5. Fig. 2 viser et eksempel på trinnprofil 1 som er egnet til å anvendes. Trinnet 1 har langsgående forhøyninger 6 fordelt rundt omkretsen. With reference to the drawings, examples of implementation of the invention shall be described in more detail. Fig. 1 shows a section through a ladder rung 2, where the end of a step 1 is fixed in a hole in the rung 2 by means of a sleeve 3. The sleeve 3 is placed between the step end 1 and the edge of the hole 4 and pressed, mainly axially. On the end of the step 1, circumferential grooves 5 are arranged, and when the sleeve 3 is pressed, the material in the sleeve 3 has moved into the grooves 5. Fig. 2 shows an example of a step profile 1 which is suitable for use. The step 1 has longitudinal elevations 6 distributed around the circumference.
En eller flere riller er anordnet rundt trinnenden, med en dybde One or more grooves are arranged around the step end, with a depth
som omtrent tilsvarer høyden av forhøyningene. Derved svekker rillene trinnet i mindre grad enn hvis trinnet har jevn veggtykkelse. Hylsen 3 får allikevel tilstrekkelig feste i de avbrutte riller which roughly corresponds to the height of the elevations. Thereby, the grooves weaken the step to a lesser extent than if the step has a uniform wall thickness. The sleeve 3 is nevertheless sufficiently secured in the interrupted grooves
som kun forløper i forhøyningene 6 i trinnet. which only takes place in the elevations 6 of the step.
Fig. 3 viser et eksempel der trinnet utvendig i tverrsnitt er en mangekant, og der rillen eller rillene forløper i hjørnene, Fig. 3 shows an example where the outside cross-section of the step is a polygon, and where the groove or grooves run in the corners,
uten å nå ned i midtpartiet 8 mellom hjørnene. Fig. 3 viser også without reaching down into the middle part 8 between the corners. Fig. 3 also shows
en hylse 3 som omslutter trinnet 1, slik at i det minste noe materiale i hylsen 3, i området ved hylsens hjørner 9 er presset ned i rillen eller rillene 5 som forløper i forhøyningene 7, dvs. hjørnene, i trinnet 1. a sleeve 3 that encloses the step 1, so that at least some material in the sleeve 3, in the area of the sleeve's corners 9, is pressed down into the groove or grooves 5 that run in the elevations 7, i.e. the corners, in the step 1.
Claims (4)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO761689A NO138541C (en) | 1976-05-18 | 1976-05-18 | DEVICE FOR STEP MOUNTING FOR LADDER. |
SE7705748A SE7705748L (en) | 1976-05-18 | 1977-05-16 | STEP MOUNTING DEVICE FOR STEGAR |
GB20990/77A GB1581480A (en) | 1976-05-18 | 1977-05-18 | Ladder construction |
DE19772722597 DE2722597A1 (en) | 1976-05-18 | 1977-05-18 | LADDER CONSTRUCTION |
DK219377AA DK144686C (en) | 1976-05-18 | 1977-05-18 | Ladder with fixed steps and ladders. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO761689A NO138541C (en) | 1976-05-18 | 1976-05-18 | DEVICE FOR STEP MOUNTING FOR LADDER. |
Publications (3)
Publication Number | Publication Date |
---|---|
NO761689L NO761689L (en) | 1977-11-21 |
NO138541B true NO138541B (en) | 1978-06-12 |
NO138541C NO138541C (en) | 1978-09-20 |
Family
ID=19882909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO761689A NO138541C (en) | 1976-05-18 | 1976-05-18 | DEVICE FOR STEP MOUNTING FOR LADDER. |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE2722597A1 (en) |
DK (1) | DK144686C (en) |
GB (1) | GB1581480A (en) |
NO (1) | NO138541C (en) |
SE (1) | SE7705748L (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO138541C (en) * | 1976-05-18 | 1978-09-20 | Raufoss Ammunisjonsfabrikker | DEVICE FOR STEP MOUNTING FOR LADDER. |
GB2139824B (en) * | 1983-05-04 | 1986-11-12 | Gte Unistrut Limited | Cable ladder or the like structure |
GB2175973A (en) * | 1985-05-20 | 1986-12-10 | Trade & Industry The Secretary | Articles including at least two members joined together |
GB2255126B (en) * | 1991-04-25 | 1994-10-12 | James Brian Clarke | Ladder |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1744199A (en) * | 1927-11-07 | 1930-01-21 | Chicago Forging & Mfg Co | Method of forming connections |
US2415180A (en) * | 1944-05-27 | 1947-02-04 | Clark J R Co | Ladder rung fastening means |
US2901822A (en) * | 1955-12-15 | 1959-09-01 | Robert B Hayden | Method of forming a harness cord end terminal |
US3039186A (en) * | 1957-08-06 | 1962-06-19 | Werner Co Inc R D | Method of forming a joint between the rail and rung of a ladder |
NL154438C (en) * | 1966-08-09 | |||
US3484931A (en) * | 1967-10-19 | 1969-12-23 | Werner Co Inc R D | Method of joining a ladder rung to a side rail |
DE2241533A1 (en) * | 1972-08-24 | 1974-03-07 | Struewer Metallfab Heinrich | PLUG-IN CONNECTION OF PROFILE RUNG IN PROFILE STAIRS OF A LADDER |
NO138541C (en) * | 1976-05-18 | 1978-09-20 | Raufoss Ammunisjonsfabrikker | DEVICE FOR STEP MOUNTING FOR LADDER. |
-
1976
- 1976-05-18 NO NO761689A patent/NO138541C/en unknown
-
1977
- 1977-05-16 SE SE7705748A patent/SE7705748L/en unknown
- 1977-05-18 DK DK219377AA patent/DK144686C/en active
- 1977-05-18 GB GB20990/77A patent/GB1581480A/en not_active Expired
- 1977-05-18 DE DE19772722597 patent/DE2722597A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
GB1581480A (en) | 1980-12-17 |
DE2722597C2 (en) | 1990-03-22 |
NO761689L (en) | 1977-11-21 |
DK219377A (en) | 1977-11-19 |
DE2722597A1 (en) | 1977-12-01 |
NO138541C (en) | 1978-09-20 |
DK144686C (en) | 1990-06-25 |
DK144686B (en) | 1982-05-10 |
SE7705748L (en) | 1977-11-19 |
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