NO850485L

NO850485L - WHEELS WITH O-RING

Info

Publication number: NO850485L
Application number: NO850485A
Authority: NO
Inventors: Thomas John Smrt
Original assignee: Thomas John Smrt
Priority date: 1984-02-10
Filing date: 1985-02-08
Publication date: 1985-08-12
Also published as: GB2153757A; GB8420440D0; SE8405700D0; JPS60169301A; FR2559427A1; DE3426330A1; AU3053084A; SE8405700L

Description

Oppfinnelsen angår hjul og især hjul med en O-ring for reduksjon av kontaktflaten mellom hjulet og The invention relates to wheels and in particular wheels with an O-ring for reducing the contact surface between the wheel and

den flate på hvilken hjulet ruller. Hjulet kan derfor rulle i en rett linje uten å forstyrres av småsten og liknende på flaten. the surface on which the wheel rolls. The wheel can therefore roll in a straight line without being disturbed by pebbles and the like on the surface.

Oppfinnelsen er især hensiktsmessig i innretninger som skal rulles over en flate i en relativt rett linje og som støter mot uregelmessigheter i flaten, eksempelvis grus, småsten og liknende. Eksempelvis beskriver U.S. 4,262,821, U.S. 3,796,353 ogU.S. 3,700,144 malingsstripemaskiner som rulles over en flate på hvilken en stripe maling sprøytes. Det er vanligvis ønskelig at malingsstripen er så rett som mulig. Slike maskiner benyttes ofte på flater hvor grus, småsten og sten og The invention is particularly appropriate in devices which are to be rolled over a surface in a relatively straight line and which collide with irregularities in the surface, for example gravel, pebbles and the like. For example, the U.S. describes 4,262,821, U.S. Pat. 3,796,353 andU.S. 3,700,144 paint striping machines which are rolled over a surface onto which a strip of paint is sprayed. It is usually desirable for the paint strip to be as straight as possible. Such machines are often used on surfaces where gravel, pebbles and stones and

andre hindringer kan ligge i maskinens bane. Når maskinens hjul treffer en liten sten eller liknende kan maskinens retning endres og stripemønsteret vil endres tilsvarende. other obstacles may lie in the machine's path. When the machine's wheel hits a small stone or similar, the machine's direction can change and the stripe pattern will change accordingly.

Et annet problem med hjul for innretningerAnother problem with wheels for gadgets

som eksempelvis malingsstripemaskiner, er kostnaden. Gummidekkhjul eller banebelagte hjul gir god trekkevne, such as paint striping machines, is the cost. Rubber tires or track-coated wheels provide good traction,

men er forholdsvis kostbare. Plasthjul er billigere enn gummidekkhjul, men plasthjul har mindre trekkevne enn disse. Dersom en malingsstripemaskin hadde hatt plasthjul ville hjulenes relativt dårlige trekkevne gjøre det vanskelig å føre maskinen i en rett linje. but are relatively expensive. Plastic wheels are cheaper than rubber tires, but plastic wheels have less traction than these. If a paint striping machine had plastic wheels, the relatively poor traction of the wheels would make it difficult to guide the machine in a straight line.

Oppfinnelsen frembringer et plasthjul medThe invention produces a plastic wheel with

en O-ring som holder plasthjulets ytre overflate i avstand over flaten og som gir godt friksjonsanlegg mellom hjulet an O-ring that keeps the outer surface of the plastic wheel at a distance above the surface and that provides a good friction system between the wheel

og flaten. O-ringen er relativt smal og har derfor liten mulighet til å treffe småsten eller liknende i motsetning til et hjul med bredere flate. O-ringen adskiller hjulets ytre flate tilstrekkelig over overflaten til at hjulet and the surface. The O-ring is relatively narrow and therefore has little chance of hitting pebbles or the like, unlike a wheel with a wider surface. The O-ring separates the outer surface of the wheel sufficiently above the surface so that the wheel

ikke vil komme i kontakt med de fleste småsten av vanlig størrelse. Dersom hjulet kommer i kontakt med en relativt stor sten, vil hjulet enklere rulle over stenen på grunn av avstanden som er frembrakt av O-ringen. Når selve O-ringen treffer en sten vil O-ringens avrundede flate will not come into contact with most regular-sized pebbles. If the wheel comes into contact with a relatively large stone, the wheel will more easily roll over the stone due to the distance created by the O-ring. When the O-ring itself hits a stone, the O-ring's rounded surface will

generelt presse stenen til en side og stenen vil ikke endre den retning hjulet ruller. generally push the stone to one side and the stone will not change the direction the wheel rolls.

Oppfinnelsen beskrives på grunnlag ev et eksem-pel vist på tegningen hvor figur 1 viser et perspektivriss av en malingsstripemaskin med ruller i henhold til oppfinnelsen, figur 2 viser et sideriss av et hjul, figur 3 viser et grunnriss av et hjul, figur 4 viser et sideriss av et adskilt hjul, figur 5 viser et sideriss langs 5-5 på figur 4, figur 6 viser et snitt av hjulet, figur 7 viser et delriss hvor hjulet er ved å treffe en relativt stor sten og figur 9 viser, tilsvarende figur 8, hjulet når dette ruller over stenen. The invention is described on the basis of an example shown in the drawing, where Figure 1 shows a perspective view of a paint striping machine with rollers according to the invention, Figure 2 shows a side view of a wheel, Figure 3 shows a ground plan of a wheel, Figure 4 shows a side view of a separate wheel, Figure 5 shows a side view along 5-5 in Figure 4, Figure 6 shows a section of the wheel, Figure 7 shows a partial view where the wheel is by hitting a relatively large stone and Figure 9 shows, corresponding to Figure 8 , the wheel when it rolls over the stone.

Figur 1 viser en malingsstripemaskin (10)Figure 1 shows a paint stripper (10)

av vanlig type som er beskrevet i de foran nevnte patent-skrifter. Maskinen omfatter et legeme (11), fire hjul (12) og et håndtak (13) for å skyve maskinen over den of the usual type described in the above-mentioned patent documents. The machine comprises a body (11), four wheels (12) and a handle (13) for pushing the machine over it

flate på hvilken stripen skal lages. En areosolboks (14) som er fylt med maling eller markeringsmateriale, holdes på håndtaket (13) og en utløser (15) på den øvre enden av håndtaket kan påvirkes slik at aerosolboksens ventil åpnes og boksens innhold sprøytes mot flaten. surface on which the strip is to be made. An aerosol can (14) filled with paint or marking material is held on the handle (13) and a trigger (15) on the upper end of the handle can be actuated so that the aerosol can's valve opens and the can's contents are sprayed onto the surface.

Slike malingsstripemaskiner rulles vanligvis Such paint striping machines are usually rolled

. over parkeringsplasser, gater, fortau og andre flater. over car parks, streets, pavements and other surfaces

hvor det er ønsket å male striper. Grus, småsten og andre uregelmessigheter kan ofte foreligge på flaten og det er ønskelig at hjulene ikke føres i feil retning på grunn av disse uregelmessigheter. where it is desired to paint stripes. Gravel, pebbles and other irregularities can often be present on the surface and it is desirable that the wheels are not guided in the wrong direction due to these irregularities.

Hvert hjul (12) på figur 3-6 omfatter et nav (16) med en akselåpning (17), et skiveparti (18) og en ytre i det vesentlige sylindrisk flate (19). En aksel (20) (Fig.1) strekker seg gjennom akselåpningen og for-binder hjulet roterbart til maskinens legeme. Each wheel (12) in figure 3-6 comprises a hub (16) with an axle opening (17), a disk part (18) and an outer, essentially cylindrical surface (19). A shaft (20) (Fig.1) extends through the shaft opening and rotatably connects the wheel to the body of the machine.

I den spesielle utførelse som er vist, er hjulet utformet av et par støpte plasthalvdeler (22a) og (22b) In the particular embodiment shown, the wheel is formed from a pair of molded plastic halves (22a) and (22b)

(se især Fig. 4 og 6). Hjulhalvdelen (22a) omfatter flere tapper (23) og tapphull (24) som strekker seg i bueform rundt navpartiet (16) på hjulhalvdelen, og flere tapper (25) og tapphull (26) som strekker seg i bueform nær den (see especially Fig. 4 and 6). The wheel half part (22a) comprises several pins (23) and pin holes (24) which extend in an arc shape around the hub part (16) of the wheel half part, and several pins (25) and pin holes (26) which extend in an arc shape near it

ytre flate på hjulhalvdelen (22a). På tilsvarende måte omfatter hjulhalvdelen (22b) tapper (27) og tapphull (28) rundt navet (16) og tapphull (29) og tapphull (30) nær den ytre flate. Tappene og tapphullene på hver hjulhalvdel har en slik størrelse og er slik anordnet at tappene kan innsettes i tapphullene i den annen halvdel. I den spesielle utførelse vist på tegningene, er tappene anordnet på et 180 graders segment på hver hjulhalvdel mens tapphullene er anordnet på det annet 180 graders segment og hver hjulhalvdel er fremstilt i samme støpeform for således å frembringe to identiske hjulhalvdeler. Alternativt kunne tappene og tapphullene være anordnet alternerende rundt hver hjulhalvdel eller i et annet arrangement som ville gi overensstemmende forhold mellom tapper og tapphull i de to halvdeler. outer surface of the wheel half (22a). In a similar way, the wheel half part (22b) comprises studs (27) and stud holes (28) around the hub (16) and stud holes (29) and stud holes (30) near the outer surface. The studs and stud holes on each wheel half have such a size and are so arranged that the studs can be inserted into the stud holes in the other half. In the particular embodiment shown in the drawings, the pins are arranged on a 180 degree segment on each wheel half while the pin holes are arranged on the other 180 degree segment and each wheel half is produced in the same mold to thus produce two identical wheel halves. Alternatively, the studs and stud holes could be arranged alternately around each wheel half or in another arrangement which would provide consistent ratios between studs and stud holes in the two halves.

Hjulet kunne også ha en ribbe på en halvdelThe wheel could also have a rib on one half

og et spor i den annen halvdel, i hvilket ribben kunne innsettes. En ribbe kunne være anordnet rundt navet og også rundt den ytre kant. I dette tilfelle ville hjulets to halvdeler ikke være identiske. and a groove in the other half, into which the rib could be inserted. A rib could be arranged around the hub and also around the outer edge. In this case the two halves of the wheel would not be identical.

Hjulhalvdelen (22a) omfatter en ytre flate (19a) som strekker seg mellom en ytre kant (32) og en indre kant (33). Et spor (34) er dannet i den ytre flate (19a) nær den indre kant (33). På tilsvarende måte omfatter hjulhalvdelen (22b) en ytre flate (19b) som strekker seg mellom ytre og indre kanter (35) og (36) , og et spor (37) er dannet nær den indre kant (36). The wheel half (22a) comprises an outer surface (19a) which extends between an outer edge (32) and an inner edge (33). A groove (34) is formed in the outer surface (19a) near the inner edge (33). In a similar way, the wheel half (22b) comprises an outer surface (19b) which extends between outer and inner edges (35) and (36), and a groove (37) is formed near the inner edge (36).

Når de to hjulhalvdeler forbindes ved innsett-ing av tappene i hver halvdel inn i tapphullene i den When the two wheel halves are connected by inserting the pins in each half into the pin holes in the

annen halvdel, dannes et spor (39) (Fig.6) med halvsirkel-formet tverrsnitt. Tappene kan holdes i tapphullene enten ved presspasning eller ved klebestoff, kjemiske løsnings-midler eller liknende. I den viste utførelse er sporet (39) plassert midtveis mellom hjulets ytre kanter (32) second half, a groove (39) (Fig.6) with a semicircular cross-section is formed. The pins can be held in the pin holes either by press fit or by adhesive, chemical solvents or the like. In the embodiment shown, the groove (39) is located midway between the outer edges of the wheel (32)

og (35) og akseldimensjonen for hvert ytre flateparti (19a) og (19b) er i det vesentlige den samme. and (35) and the shaft dimension of each outer surface portion (19a) and (19b) is substantially the same.

En O-ring (41) er anordnet i sporet (39) og rager radialt ut utenfor hjulets ytre flate. O-ringen er fortrinnsvis dannet av elastisk materiale, eksempelvis gummi eller syntetisk gummi og friksjonen mellom O-ringen og den flate på hvilken malingsstripemaskonen ruller, An O-ring (41) is arranged in the groove (39) and projects radially outside the outer surface of the wheel. The O-ring is preferably made of elastic material, for example rubber or synthetic rubber, and the friction between the O-ring and the surface on which the paint strip machine rolls,

er i det vesentlige større enn friksjonen mellom plasthjulet (12) og flaten. O-ringenøker således vesentlig trekkevnen mellom hjulet og flaten. is essentially greater than the friction between the plastic wheel (12) and the surface. The O-ring thus significantly increases the traction between the wheel and the surface.

O-ringens (41) indre diameter i dens uspente stilling før montering på hjulet, er fortrinnsvis noe mindre enn sporets (39) minimumsdiameter slik at O-ringen strekkes når den settes inn i sporet. Friksjonskraften mellom O-ringen og sporets flate hindrer relativ rotasjon mellom O-ringen og hjulet. The inner diameter of the O-ring (41) in its untensioned position before mounting on the wheel is preferably somewhat smaller than the minimum diameter of the groove (39) so that the O-ring is stretched when it is inserted into the groove. The frictional force between the O-ring and the surface of the track prevents relative rotation between the O-ring and the wheel.

O-ringens (41) tverrsnitt kan ha flere former, eksempelvis rund, oval, kvadratisk, D-formet etc. Imidlertid foretrekkes den runde form og O-ringen og sporet (39) har fortrinnsvis en slik form at tilnærmet halvdelen av O-ringens tverrsnitt rager ut mellom de ytre flater (19a) og (19b) på hjulhalvdelene, slik det er vist på The cross-section of the O-ring (41) can have several shapes, for example round, oval, square, D-shaped etc. However, the round shape is preferred and the O-ring and the groove (39) preferably have such a shape that approximately half of the O-ring's cross-section protrudes between the outer surfaces (19a) and (19b) of the wheel halves, as shown in

figur 6.figure 6.

Hjulhalvdelenes ytre flate (19a), (19b) kan støpes med form som en hjulskive, av hensyn til utseendet. Da disse flater imidlertid ikke får kontakt med overflaten på hvilken hjulene ruller, kan disse flater være sylindriske eller glatte. Da enhver slitebane primært foreligger av estetiske grunner, kan også de ytre flater av slite-banen utføres glatte eller sylindriske for å tilfredsstille oppfinnelsens formål. The outer surface (19a), (19b) of the wheel halves can be molded in the shape of a wheel disc, for reasons of appearance. However, as these surfaces do not come into contact with the surface on which the wheels roll, these surfaces can be cylindrical or smooth. As any tread exists primarily for aesthetic reasons, the outer surfaces of the tread can also be made smooth or cylindrical in order to satisfy the purpose of the invention.

Slik det sees på figur 7 og 8 har hvert hjuls O-ring (41) kontakt med overflaten S og hjulets ytre flate (19) er anordnet over flaten. Når hjulet treffer en liten sten P hvis høyde er mindre enn rommet mellom overflaten S og hjulets ytre overflate (19), vil hjulet rulle over stenen uten motstand slik det er vist på figur 7. Dersom stenen er tilstrekkelig stor til at det dannes- kontakt med hjulets ytre flate, slik det er vist på figur 8, vil hjulet generelt sett rulle over stenen uten å endre retning. Dette på grunn av at hjulets ytre overflate generelt vil As can be seen in figures 7 and 8, each wheel's O-ring (41) is in contact with the surface S and the outer surface (19) of the wheel is arranged above the surface. When the wheel hits a small stone P whose height is less than the space between the surface S and the wheel's outer surface (19), the wheel will roll over the stone without resistance as shown in figure 7. If the stone is large enough for contact to form with the outer surface of the wheel, as shown in figure 8, the wheel will generally roll over the stone without changing direction. This is because the wheel's outer surface will generally

ha kontakt med stenen tilstrekkelig høyt til å tillate have contact with the stone sufficiently high to allow

hjulet enkelt å rulle over stenen, slik det er vist på figur 8 og 9. Dersom hjulet ikke hadde befunnet seg i avstand over flaten ved hjelp av O-ringen, ville til og med små sten forårsake at hjulet ville gli bort eller forskyves fra den retning hjulet ruller. the wheel to easily roll over the stone, as shown in figures 8 and 9. If the wheel had not been at a distance above the surface by means of the O-ring, even small stones would cause the wheel to slide away or be displaced from it direction the wheel rolls.

Dersom O-ringen treffer en sten eller liknende vil O-ringens ytre flate generelt presse stenen til den ene eller annen side. Hjulet kan deretter rulle over stenen som beskrevet ovenfor. If the O-ring hits a stone or similar, the outer surface of the O-ring will generally push the stone to one side or the other. The wheel can then roll over the stone as described above.

Ved en spesiell utførelse har O-ringen (41)In a special design, the O-ring (41) has

en tverrsnittsdiameter på 9,5 mm. Hjulets ytre diameter er 136,5 mm. Halvdelen av O-ringens ytre tverrsnitt er anordnet på utsiden av hjulets spor og hjulets ytre flate befinner seg derfor i en avstand på 4,8 mm. over flaten hjulet ruller på. Størrelsen av O-ringen i hjulets aksiale retning, som rager ut av sporet, er 9,5 mm. Hvert ytre flatepartis (19a) og (19b) aksiale størrelse på hjulhalvdelen var omtrent 12,5 mm. og O-ringens aksiale størrelse var derfor kun noe større enn 25% av hele den aksiale størrelse av hjulets ytre overflate. a cross-sectional diameter of 9.5 mm. The outer diameter of the wheel is 136.5 mm. Half of the O-ring's outer cross-section is arranged on the outside of the wheel's track and the wheel's outer surface is therefore at a distance of 4.8 mm. over the surface the wheel rolls on. The size of the O-ring in the axial direction of the wheel, protruding from the groove, is 9.5 mm. The axial size of each outer surface portion (19a) and (19b) of the wheel half was approximately 12.5 mm. and the axial size of the O-ring was therefore only slightly greater than 25% of the entire axial size of the wheel's outer surface.

Det er funnet at et hjul utformet i henhold til oppfinnelsen kan koste omtrent halvdelen av kostnadene for et konvensjonelt gummibelagt hjul og kun noe mere enn et plasthjul. Imidlertid har hjulet i henhold til oppfinnelsen vesentlig større trekkraft enn et plasthjul og tilnærmet den samme trekkraft som et gummihjul. Videre utsettes hjulet i forhold til oppfinnelsen på grunn..av den reduserte overflatekontakt mellom hjulet og overflaten vesentlig for å innta feil retning på grunn av småsten og andre overflateuregelmessigheter, enn både plasthjulet og gummihjulet. It has been found that a wheel designed according to the invention can cost about half the cost of a conventional rubber coated wheel and only slightly more than a plastic wheel. However, the wheel according to the invention has significantly greater traction than a plastic wheel and approximately the same traction as a rubber wheel. Furthermore, in relation to the invention, due to the reduced surface contact between the wheel and the surface, the wheel is significantly exposed to take the wrong direction due to pebbles and other surface irregularities, than both the plastic wheel and the rubber wheel.

Claims

Wheel, CHARACTERIZED BY comprising a

axle portion, a substantially cylindrical outer surface with separated first and second outer edges, and a ring of friction material extending around the circumference of the cylindrical outer surface between the first and second edges,

and also extending radially outwardly beyond the cylindrical outer surface to provide the wheel with first and second substantially cylindrical outer surface portions and a radially outwardly projecting friction ring between the first and second outer surface portions.

2. Wheel according to claim 1, CHARACTERIZED IN THAT the ring has a curved outer surface between the first and second outer surface portions.

3. Wheel according to claim 1, CHARACTERIZED IN THAT the ring is formed of elastomeric material.

4. Wheel according to claim 1, CHARACTERIZED IN THAT the essentially cylindrical outer surface has a groove between the first and second edges and that the ring is an O-ring arranged in the groove.

5. Wheel according to claim 4, CHARACTERIZED IN THAT the wheel is formed by a pair of molded plastic halves which are connected to each other along a plane which runs through the track.

6. Wheel according to claim 5, CHARACTERIZED IN THAT each molded plastic half is identical and comprises several axially projecting studs and stud holes, the studs in one half being inserted into the stud holes in the other half.

7. Wheel according to claim 4, CHARACTERIZED IN THAT the O-ring has a circular cross-section and approximately half of the O-ring's cross-sectional shape is arranged radially outside the first and second outer surface portions of the wheel.

8. The marking device is arranged to be rolled over a surface to be marked, CHARACTERIZED IN that it comprises a base to support a container of marking material and several wheels which are rotatably mounted to the bottom, each wheel comprising an axle portion, one substantially cylindrical outer surface having spaced first and second outer edges, and a ring of friction material extending around the circumference of the cylindrical outer surface between the first and second edges and extending radially beyond the cylindrical outer surface to provide the wheel with first and second essentially cylindrical outer surface portions and a radially outwardly projecting friction ring between the first and second outer surface portions, the first and second outer surface portions of the ring being held at a distance above the surface to be marked.

9. Device according to claim 8, CHARACTERIZED IN THAT the ring of each wheel has a curved outer surface between the first and second outer surface parts of the wheel.

10. Device according to claim 9, CHARACTERIZED IN THAT the ring of each wheel is made of elastomeric material.

11. Device according to claim 8, CHARACTERIZED IN THAT the essentially cylindrical outer surface of each wheel has a groove between the first and second edges and that the ring of each wheel is an O-ring arranged in the groove.

12. Device according to claim 11, CHARACTERIZED IN THAT each wheel is produced from a pair of molded plastic halves which are connected along a plane which extends through the track.

13. Device according to claim 12, CHARACTERIZED BY the fact that each molded plastic half is identical and comprises several axially outwardly projecting studs and stud holes, as the studs in one half can be inserted into the stud holes in the other half.

14. Device according to claim 11, CHARACTERIZED IN THAT the O-rings have a circular cross-section and that approximately half of the O-ring's cross-section is arranged radially outside the first and second outer surface parts of the wheel.