NO165067B

NO165067B - CONSOLIDATED MATERIAL, PROCEDURE FOR THE MANUFACTURING OF ETSPINEL POWDER THEREOF, AND CASTLE MIXTURE.

Info

Publication number: NO165067B
Application number: NO82821460A
Authority: NO
Inventors: Dale Marion Bertelsman; William Mark Eckert; Stanley Joseph Morrow; Walter Warren Henslee; John Sutton Lindsey; John Neil Periard; Charles Robert Whitworth; Greene Wallace Strother Jr
Original assignee: Dow Chemical Co
Priority date: 1980-09-04
Filing date: 1982-05-03
Publication date: 1990-09-10
Also published as: NO821460L; NO165067C; AU539040B2

Description

Slurehindreirde'brodd-for kjbretbydekk. Slurehindreirde'brodd-for kjbretbydekk.

Foreliggende oppfinnelse vedrbrer en slurehindrende brodd for, montering i kjbretbydekk og lignende, omfattende en festedel.og en på denne anbragt slitedel av slitedyktig materiale, såsom hårdmetall, og utformet for befestigelse i dekket med festedelen innenfor slitebanen og slitedelen ragende helt eller delvis ut av slitebanen. The present invention relates to a slip-preventing stud for, mounting in a treaded tire and the like, comprising a fastening part and a wearing part placed on it of wear-resistant material, such as hard metal, and designed for fastening in the tire with the fastening part inside the tread and the wearing part projecting wholly or partly out of the tread .

Tidligere- kjente brodder for kjbretbydekk er bestemt Previously known studs for kjbret city tires have been determined

for normal landeveiskjbring og deres egenskaper er tilpasset hertil. For å oppnå en brodd med så lang levetid som mulig, må for normal road driving and their properties are adapted to this. To achieve a sting with as long a life as possible, must

det parti av brodden som stikker ut fra slitebanen, begrenses, the part of the spike that protrudes from the tread is limited,

da en stor utstikning utsetter brodden for sådanne belastnings-forhold at den forholdsvis hurtig lbsner fra sin befestigelse. as a large protrusion exposes the sting to such load conditions that it relatively quickly loosens from its attachment.

Ved konkurransekjbring er det nbdvendig å oppnå den In competitive procurement, it is necessary to achieve it

best mulige gripevirkning, idet broddens levetid kommer i annen best possible gripping effect, as the lifetime of the sting is second

rekke. Brodden kan da utformes anderledes enn for standardbruk, row. The sting can then be designed differently than for standard use,

og oppfinnelsen angår en brodd med maksimal gripeevne. and the invention relates to a stinger with maximum grip.

Det særegne ved oppfinnelsen framgår nærmere av patentpåstandene og skal forklares i det fblgende under hen-visning til tegningen, på hvilken fig. 1 viser et oppriss i forstorret målestokk av en brodd ifolge oppfinnelsen og^fig. 2 et enderiss av en hårdmetallinnsats for den på fig. 1 viste brodd. The peculiarity of the invention appears in more detail from the patent claims and shall be explained in the following with reference to the drawing, in which fig. 1 shows an enlarged view of a sting according to the invention and Fig. 2 an end view of a cemented carbide insert for the one in fig. 1 showed sting.

Brodden ifblge fig. 1 omfatter en festedel 11 og en .* slitedel 12. Festedelen består av et hode 13, en mellemlig-gende flens lk og en flens 15 for montering av slitedelen 12. De til siden utragende partier 13, 1^ og 15 gir brodden en god stabilitet i dekket. Brodden er utfort således at den kan mon-teres i ejt ferdig dekk ved at den .festes i på forhånd anordnede "boringer i dekkets slitebane. Disse boringer blir til dette for-- mål ved hjelp"av et spesielt verktdy temporert,utvidet i side-retningen under broddens innfbring, således at hullveggen efter verktbyets fjernelse trekker seg sammen omkring brodden og fastholder denne ved inngrep med de utragende partier 13, l1* og 15. The bite according to fig. 1 comprises a fastening part 11 and a wearing part 12. The fastening part consists of a head 13, an intermediate flange 1k and a flange 15 for mounting the wearing part 12. The laterally projecting parts 13, 1^ and 15 give the sting a good stability of the tire. The stud is designed in such a way that it can be mounted in a finished tire by attaching it to pre-arranged holes in the tread of the tire. - the direction during the introduction of the sting, so that the hole wall contracts around the sting after the removal of the tool and holds it in place by engagement with the projecting parts 13, 11* and 15.

Flensen 15 er forsynt med en utsparing 16 i ende-flaten, i hvilken utsparing slitedelen 12 er montert, fortrinnsvis ved lodding, idet loddemassen foyer sammen de mot hin-annen liggende flater av flensen 15 og slitedelen 12 og også hensiktsmessig fyller mellomrommet 1? mellom slitedelen 12 og det ringformede parti 18 som danner et ekstra stotte mot «kjærkrefter mellom slitedelen 12 og festet 11. The flange 15 is provided with a recess 16 in the end surface, in which recess the wearing part 12 is mounted, preferably by soldering, as the solder paste fuses together the facing surfaces of the flange 15 and the wearing part 12 and also suitably fills the space 1? between the wearing part 12 and the ring-shaped part 18 which forms an extra support against "shearing forces between the wearing part 12 and the attachment 11.

Broddens gripeevne er avhengig av den mot et vertikalplan projiserte flate av det i veibanen inntrengende parti av brodden. Jo mindre denne flate er, desto lettere kan brodden slure på en isflate -ved å rive opp et spor i isen. Han sbker altså å oppnå et optimum av kombinert inntragning og bredde av det inntrengende parti, idet der i almindelighet og^ så må tas hensyn til fastheten. En lang slitedel blir mere utsatt for mekaniske påkjenninger, samtidig som ogBå broddens befestigelse blir sterkere belastet. Dertil kommer at broddens inntrengning ikke må overskride de gjeldende bestemmelser for konkurransebrodder. The grip capacity of the spike depends on the surface of the part of the spike that penetrates the road surface projected against a vertical plane. The smaller this surface is, the easier the stinger can slip on an ice surface - by tearing up a groove in the ice. He therefore seeks to achieve an optimum of combined indentation and width of the indenting part, since in general and^ then the firmness must be taken into account. A long wearing part is more exposed to mechanical stress, and at the same time the fastening of the blade is more heavily loaded. In addition, the sting's penetration must not exceed the applicable regulations for competition stings.

Av dkonomiske grunner lar man en så stor del som mulig av slitedelen rage ut fra slitebanen, idet det dog bor påses at den overfor slitasje mindre motstandsdyktige festedel befinner seg helt innenfor dekket. Den gunstigste beliggenhet av slitebanen er på fig. 1 antydet med den strekprikkede linje 21. Det vesentlige for broddens inngrepsfunksjon er selvsagt ut-formingen av den del som rager ut av slitebanen. For economic reasons, as large a part as possible of the wearing part is allowed to protrude from the tread, although it must be ensured that the attachment part, which is less resistant to wear, is completely inside the tire. The most favorable location of the tread is in fig. 1 indicated by the dash-dotted line 21. The essential thing for the engagement function of the spike is of course the design of the part that protrudes from the tread.

Det har vist seg at den gunstigste form av det parti av slitedelen som rager.ut av dekkets slitebane, ér utad avsmalende, idet dette parti er tetraederformet,, nærmere bestemt således at dets hoyde er 0,25 - 1,25 eller 1,50, fortrinnsvis 0,5 - 1,0 av diameteren av den sirkel som omskriver basis-eller grunnflaten. Som ved den illustrerte utforelsen kan da det parti av slitedelen 12 som ligger innenfor slitebanen 21, ha sideflater som danner en forlengelse av den utragende dels sideflater, således at den flate 16a av slitedelen som ved den viste befestigelse ligger an mot festedelen, blir relativ stor og gir en stabil stotte. Imidlertid kan slitedelen ved sin hedre del utformes anderledes enn sist og eksempelvis gis form av en stift som rager inn i festedelen. It has been shown that the most favorable shape of the part of the wear part that protrudes from the tread of the tire is outwardly tapered, as this part is tetrahedron-shaped, more specifically so that its height is 0.25 - 1.25 or 1.50 , preferably 0.5 - 1.0 of the diameter of the circle circumscribing the base or base surface. As with the illustrated embodiment, the part of the wearing part 12 which lies within the wearing track 21 can then have side surfaces which form an extension of the side surfaces of the projecting part, so that the surface 16a of the wearing part which, in the case of the attachment shown, rests against the fastening part, becomes relatively large and provides a stable support. However, the wearing part can be designed in a different way than last and, for example, given the shape of a pin that protrudes into the fastening part.

Den del av slitedelen som rager ut av slitebanen, skal altså ha utad avsmalende form og være i hovedsaken tetraederformet. Tetraederform en har vist seg å gi vesentlig bedre gripeegenskaper enn den koniske form. Slitedelen er således dimensjonert at alle tetraederets sider er like lange. The part of the wearing part that protrudes from the tread must therefore have an outwardly tapered shape and be mainly tetrahedron-shaped. The tetrahedron shape has been shown to give significantly better gripping properties than the conical shape. The wear part is dimensioned so that all sides of the tetrahedron are the same length.

Slitedelens form kan imidlertid modifiseres for ytterligere forbedring av inngreps- og festeegenskapene. Den på tegningen viste slitedel har således i hovedsaken tetraeder-forrn, men dens spiss er utformet som en sylinder med rett avskåret ende og med betydelig mindre diameter enn diameteren av den sirkel som omskriver grunnflaten. Derved iSkes den på et vertikalplan projiserte flate av slitedelen uten at inntreng-ningsevnen nedsettes nevneverdig sammenlignet med en skarp spiss og dessuten bibeholdes i det vesentlige konstant. En skarp spiss vil få. sin inntrengningsevne forholdsvis hurtig nedsatt som fOlge av slitasje og er dessuten mer utsatt for bruddfare enn den viste avskårne spiss. However, the wear part's shape can be modified to further improve the engagement and fastening properties. The wearing part shown in the drawing thus mainly has a tetrahedron shape, but its tip is designed as a cylinder with a straight cut off end and with a significantly smaller diameter than the diameter of the circle that circumscribes the base surface. Thereby, the surface of the wearing part projected on a vertical plane is cut without the penetration ability being significantly reduced compared to a sharp tip and, moreover, is maintained essentially constant. A sharp tip will get. its ability to penetrate relatively quickly reduced as a result of wear and tear and is also more prone to breakage than the cut tip shown.

Ved den viste utfbrelse er den tetraederformede slitedels basishjSrner avskåret, hvorved oppnås en reduksjon av basisflatens størrelse uten noen vesentlig nedsettelse av befestningens sidestabilitet. Derved reduseres broddens tverr-dimensjon. In the embodiment shown, the base corners of the tetrahedron-shaped wearing part are cut off, whereby a reduction in the size of the base surface is achieved without any significant reduction in the lateral stability of the fortification. Thereby, the transverse dimension of the sting is reduced.

I almindelighet velges den pyramideformede slitedels sideflater med fordel plant, men de kan eventuelt ha en buet form uten å avvike fra den hovedsakelige tetraederform. In general, the side surfaces of the pyramid-shaped wear part are advantageously chosen to be flat, but they can optionally have a curved shape without deviating from the main tetrahedron shape.

Claims

1. Slip-preventing stud for curbside tyres, comprising a fastening part (11) and a wearing part (12) placed on it of wear-resistant material, such as hard metal, and designed for fastening 1 the tire with the fastening part inside the tread (21) and the wearing part projecting wholly or partly out of the tread, characterized in that the wear part (12) has an essentially tetrahedron shape and that its base surface (16a) is attached to the bottom of a recess (16) in the attachment part, surrounded by an upwardly directed flange (18).

2. Sting according to claim 1, characterized in that the tip of the tetrahedron is thickened and has the shape of a cylinder (19).

3. Sting according to claim 1 or 2, characterized in that the base bones of the tetrahedron are cut off (20).