NO123054B

NO123054B -

Info

Publication number: NO123054B
Application number: NO101771A
Authority: NO
Inventors: P Jakobsson; H Kaernhall
Original assignee: Svenska Flaektfabriken Ab
Priority date: 1970-04-27
Filing date: 1971-03-17
Publication date: 1971-09-20
Also published as: AU2700471A; FR2090795A5; BE765663A; DE2114796B2; DK126393B; SE341255B; CH532748A; NL7105045A; DE2114796A1

Description

Lettmontert stativ. Easily assembled stand.

Oppfinnelsen angår en ny og forbedret utforelse av et lettmontert stativ som er oppbygd av et antall ror med lengder som er avpasset etter de aktuelle stativdimensjoner, og som er forenet ved hjelp av holdeelementer som fungerer som knutepunkter. The invention relates to a new and improved embodiment of an easily assembled stand which is made up of a number of rudders with lengths which are adapted to the relevant stand dimensions, and which are united by means of holding elements which function as nodes.

Nærmere bestemt angår oppfinnelsen en forbedring i det svenske utlegningsskrift 318 390 beskrevne stativ, hvor holdeele-mentene er utfort med i lengderetningen oppslissede, fjærende rorhylser som ved friksjon fastholder stativrorene som er anbrakt inne i eller utenpå hylsene. More specifically, the invention relates to an improvement in the stand described in the Swedish specification document 318 390, where the holding elements are extended with longitudinally slotted, springy rudder sleeves which by friction retain the stand rudders which are placed inside or outside the sleeves.

Det kan inntreffe at visse maskiner som bæres oppe av stativet, under drift utsetter stativet for så sterke vibrasjoner at de nevnte oppslissede rorhylser ikke kan motstå de krefter med utvidende virkning som de utsettes for, slik- ac hylsenes grep om It can happen that certain machines which are carried aloft by the stand, during operation expose the stand to such strong vibrations that the aforementioned split rudder sleeves cannot withstand the forces with an expanding effect to which they are exposed, such as the grip of the sleeves

stativrorene losner og stativet blir ustabilt. the stand rotors loosen and the stand becomes unstable.

Oppfinnelsen eliminerer denne ulempe ved at holde-elementene i tilfeller med stor belastning utskiftes med elemen- The invention eliminates this disadvantage by replacing the holding elements in cases of heavy load with elements

ter der rorhylsenes grep om stativrorene ikke avtar, men tvert om blir fastere jo sterkere vibrasjoner stativet utsettes for. Ifolge oppfinnelsen forsynes rorhylsen med et antall langsgående ribber som i det ferdigmonterte stativ befinner seg i mellomrommet mellom hylseroret og stativroret, og med sitt trykk mot roret deformerer disse slik at de nesten berorer hverandre mellom ribbene. Dersom stativet utsettes for en skjev belastning som skyldes vibrasjoner og som forskyver stativroret i forhold til hylseroret, deformeres disse ror ytterligere med okt trykk mellom ribber og stativror som resultat. Dette trykk vokser raskere enn' lineært med forskyvningen fra stilling der rorene så vidt berorer hverandre. Sammenliknet med det nevnte stativ med. oppslissede rorhylser, der tilbakeforings-krefterne i hovedsaken vokser lineært med forskyvningen, er altså where the grip of the rudder sleeves on the tripod rudders does not decrease, but on the contrary becomes firmer the stronger the vibrations the tripod is exposed to. According to the invention, the rudder sleeve is provided with a number of longitudinal ribs which, in the fully assembled stand, are located in the space between the sleeve rudder and the stand rudder, and with their pressure against the rudder, these deform so that they almost touch each other between the ribs. If the stand is exposed to a skewed load caused by vibrations and which displaces the stand rudder in relation to the sleeve rudder, these rudders are further deformed with increased pressure between the ribs and stand rudder as a result. This pressure grows faster than linearly with the displacement from a position where the rudders barely touch each other. Compared to the aforementioned stand with. slotted rudder sleeves, where the return forces essentially grow linearly with the displacement, are thus

det nye stativ mer stabilt. the new stand more stable.

Oppfinnelsen skal i det folgende beskrives nærmere The invention will be described in more detail below

'under henvisning til tegningene som viser et utforelseseksempel i-fblge oppfinnelsen og der fig. 1 viser et perspektivisk bilde av et stativ som er oppbygd av ror og prefabrikerte holdeelementer with reference to the drawings which show an exemplary embodiment of the invention and where fig. 1 shows a perspective view of a stand which is made up of rudders and prefabricated holding elements

ifolge oppfinnelsen, fig. 2 viser et perspektivisk bilde av et prefabrikert holdeelement for montering av et hjorne av stativet ifolge fig. 1 og fig. 3 viser på samme måte et prefabrikert holdeelement for montering av stotteben og tverrbjelke på en langside av stativet ifolge fig. 1. according to the invention, fig. 2 shows a perspective view of a prefabricated holding element for mounting a corner of the stand according to fig. 1 and fig. 3 shows in the same way a prefabricated holding element for mounting support legs and crossbeam on a long side of the stand according to fig. 1.

På tegningen betegner 1 et stativ ifolge oppfinnelsen In the drawing, 1 denotes a stand according to the invention

som bærer oppe en gjenstand. 2 som vist strektegnet. Stativet be- that carries an object. 2 as shown dashed. The stand be-

står av et antall ror 3 me<i lengder som er avpasset etter de øns- consists of a number of rudders of 3 me<i lengths which are adapted to the desired

kede stativdimensjoner, og som er sammenfoyd ved hjelp av som ked stand dimensions, and which are joined by means of which

knutepunkter fungerende, prefabrikerte holdeelementer h og 5. En slik enhet f.eks. % består av to eller flere rorhylser 6 med for-skjellige retninger som ved sveising eller på annen måte er stivt festet til en vinkelbbyd plate 7 hvis ben 8 danner stativavstivende nodes functioning, prefabricated holding elements h and 5. Such a unit e.g. % consists of two or more rudder sleeves 6 with different directions which, by welding or in some other way, are rigidly attached to an angled plate 7 whose legs 8 form a frame stiffener

knuteplater. Disses ovre horisontale ben utgjor samtidig stotteplan for den gjenstand 2 som bæres av stativet. Enheten k er for-* synt méd påsveisede avstivningsplater 9. knot plates. Its upper horizontal leg also forms a support plane for the object 2 carried by the stand. The unit k is provided with welded-on bracing plates 9.

Rbrhylsene 6 er forsynt med ribber 10 som er utpresset i rorgodset eller pålagt og festet ved hjelp av sveising eller på The rib sleeves 6 are provided with ribs 10 which are pressed into the rudder stock or applied and fixed by means of welding or on

annen måte. Ribbene kan med fordel være;utfbrt kortere enn ror- . another way. The ribs can advantageously be made shorter than the rudder.

hylsene, slik at monteringen av stativet lettes. the sleeves, so that mounting the stand is easier.

I den viste utforelsesform er rorhylsene beregnet å omslutte stativrorene, og ribbene er derfor anbrakt på hylserorets innerside. Oppfinnelsen er imidlertid ikke begrenset til denne utforelsesform, men ribbene kan også anbringes på yttersiden, In the embodiment shown, the rudder sleeves are intended to enclose the tripod rudders, and the ribs are therefore placed on the inner side of the sleeve rudders. However, the invention is not limited to this embodiment, but the ribs can also be placed on the outside,

idet stativrorene skyves utenpå rorhylsene. as the tripod rudders are pushed outside the rudder sleeves.

Ved passende valg av rordiametre, rortykkelser, hylse-lengde, ribbehoyde og ribbeavstand kan det når stativroret inn-skyves i eller påskyves på rorhylsen, oppnås en slik virkning at både hylseror og stativror eller bare det ene deformeres fra den sirkulære form, slik at de deler av rorene som befinner seg midt mellom ribbene, nærmer seg hverandre så mye at de nesten berorer hverandre. Dersom nå stativror og rorhylse på grunn av en ytre kraft forskyves i sideretningen i forhold til hverandre, skjer det en ytterligere deformering av rorene, slik at de berorer hverandre og forhindrer eller vanskeliggjør en fortsatt forskyvning. Dersom en slik forskyvning likevel skulle inntreffe, vokser tryk-kene mellom rorene i berøringsflatene mellom rorene og ribbene raskere enn lineært med forskyvningen, slik at denne effekt hindres. By choosing suitable rudder diameters, rudder thicknesses, sleeve length, rib height and rib spacing, when the tripod rudder is pushed into or pushed onto the rudder sleeve, such an effect can be achieved that both sleeve rudder and tripod rudder or just one is deformed from the circular shape, so that they parts of the rudders which are located in the middle between the ribs, approach each other so much that they almost touch each other. If now the stand rudder and rudder sleeve are displaced laterally in relation to each other due to an external force, a further deformation of the rudders occurs, so that they touch each other and prevent or make further displacement difficult. If such a displacement should nevertheless occur, the pressures between the rudders in the contact surfaces between the rudders and the ribs grow faster than linearly with the displacement, so that this effect is prevented.

Claims

1. An easily assembled stand which is made up of a number of stand rudders with lengths that are adjusted according to the relevant dimensions and united by means of prefabricated holding elements acting as nodes consisting of two or more rudder sleeves with different directions and which are extended so that they suspension holds the tripod rudders and is rigidly attached to an angle-shaped plate whose legs form tripod-stiffening knot plates and at the same time form a support plane for the object that the tripod is to carry, characterized by the fact that the rudder sleeves are provided with longitudinal ribs at the same distance from each other and with the rib height adjusted according to the rib spacing, and that the dimensions and elasticity of the sleeve rudder and tripod rudder are such that the rudders in the assembled state are deformed by the ribs, so that they touch or almost touch each other between the ribs.

2. Stand according to claim 1, characterized in that the ribs are pressed into the rudder material.

3. Stand according to claim 1, characterized in that the ribs are applied to the rudder material and fixed by means of welding or similar. *f.

Stand according to claim 2 or 3, characterized in that the inner diameter of the rudder sleeves exceeds the outer diameter of the stand rudders and that the ribs protrude from the inner cylindrical surface of the rudder sleeve.

5. Stand according to claim 2 or 3?characterized by the fact that the outer diameter of the rudder sleeves is less than the inner diameter of the stand rudders and that the ribs protrude from the outer cylindrical surface of the rudder sleeve.

6. Stand according to requirement h or 5" characterized by the ribs being shorter than the rudder sleeve so that cå. 1 cm of the rudder sleeve is free from ribs, which makes it easier to place the tripod rudder in or on the rudder sleeve.