SE505775C2

SE505775C2 - Device for improving tyre grip on snow or ice covered surface

Info

Publication number: SE505775C2
Application number: SE9603475A
Authority: SE
Inventors: Gunnar Forsberg
Original assignee: Gunnar Forsberg
Priority date: 1996-09-24
Filing date: 1996-09-24
Publication date: 1997-10-06
Also published as: SE9603475L; SE9603475D0

Abstract

At least two V-shaped bow frames (2, 3) made of relatively stiff material have their ends bent around the tread surface of the tyre (1) from one side of the tyre to the other. Fasteners (4, 5) are used to tighten the bow frames against the sides of the tyre. Replaceable components made of relatively stiff but elastically resilient material are mounted in the bow frame ends to allow the device to adapt to different tyre widths. Preferably the frame ends are threaded into off-centre holes in the components, which are made from an elastomer or a relatively rigid polyurethane foam. A flexible belt (4) and clasp (5) are used as the fastener.

Description

505 775 1 figur 2 visarsamma anodning, sedd ﬁån däckets andra sida, ñgur 3 visar en andra anordning enligt uppﬁnningen, sedd från däckets ena sida, ﬁgtn' 4 visar ett element enligt uppfinningen, figur 5 visar elementet i ñgur 4, sett i ett tvärsnitt, figur 6 visar en del av ett spännorgan, uppifrån, medan ﬁgtrr7visarsammafóremälfrån sidan. 505 775 1 figure 2 shows an anode, seen from the other side of the tire, ñgur 3 shows a second device according to the invention, seen from one side of the tire, ﬁ gtn '4 shows an element according to the invention, figure 5 shows the element in ñgur 4, seen in a cross section Figure 6 shows a part of a clamping member, from above, while ﬁ gtrr7 shows the same front view from the side.

I figurerna betecknas ett fordonsdäck med 1. I ﬁgur 1 visas en ett första utförande av två byglar 2 resp 3, medan ett andra utförande av byglama ll resp 12 visas i figur 3, i dena fall med tvärstag 13. Ett spännorgan består av ett band 4, och ett spänne 5. Spännorganet är så utformat, att anordningen kan användas på. fordonsdäck med olika diameter samt att det ger väl tilltagen spännkraft. En första banddel är fäst i den ena bygeln 2 och en andra banddel i den andra bygeln 3. Spännet 5 innefattar en trutnma 14, vridbar relativt en stativdel 15, relativt vilken även en hävarm 16 är vridbar, koaxiellt med trummambenna är vid gavlama försedd med kransar med halva hullingar 17, vilka samverkar dels med ett första fjädrande spärrorgan 18, styrt i stativdelen 15, och dels samverkar med ett andra fjädrande spärrorgan 19, styrt i hävarmen 16, så att en ände av bandet med hjälp av hävarmen kan rullas upp på trumman till ett lösbart låst läge, medan den andra änden av bandet är fäst i stativdelen. I ändarna på byglama, vilka kan vara utförda av metall såsom aluminium eller någon relativt styv plast och uppvisa en böjstyv profil, t ex U- formad, är element 6 - 9 pàträdda. De uppvisar i detta fall ett rektangulärt tvärsnitt med ett, setti ett tvärsnitt, osymmetriskt placerat urtag 10, dimensionerat så, att elementet med viss tröghet kan träs över bygeländarna. De är tillverkade av en elastomer av lämplig styvhet eller ett polyuretanskum. Genom den visade utformningen kan element med en viss dimension användas för däck av olika bredder genom att elementen träs på med olika vinkelläge kring bygeländarnas längdaxel.. Med tanke på den stora variationen av däckdimensioner är det lämpligt att tillverka element av olika dimensioner. Andra utformningar av elementen är givetvis tänkbara inom ramen för uppñnningen, t ex med runt tvärsnitt, rned urtaget placerat excentriskt. Även byglama tillverkas lämpligen i olika storlekar för att kunna användas inom ett stort sortiment av däck.In the figures, a vehicle tire is denoted by 1. Figure 1 shows a first embodiment of two stirrups 2 and 3, respectively, while a second embodiment of the stirrups 11 and 12, respectively, is shown in Figure 3, in these cases with crossbars 13. A tensioning member consists of a band 4, and a buckle 5. The clamping member is designed so that the device can be used on. vehicle tires with different diameters and that it provides ample tensile force. A first band part is fixed in one bracket 2 and a second band part in the second bracket 3. The buckle 5 comprises a drum 14, rotatable relative to a frame part 15, relative to which also a lever 16 is rotatable, coaxially with the drum legs are provided at the ends wreaths with half barbs 17, which co-operate partly with a first resilient locking member 18, guided in the frame part 15, and partly co-operate with a second resilient locking member 19, controlled in the lever 16, so that one end of the belt can be rolled up on the lever by means of the lever the drum to a releasably locked position, while the other end of the strap is attached to the frame part. At the ends of the stirrups, which may be made of metal such as aluminum or some relatively rigid plastic and have a flexurally rigid profile, for example U-shaped, elements 6 - 9 are threaded. In this case, they have a rectangular cross-section with a, in a cross-section, asymmetrically placed recess 10, dimensioned so that the element can be threaded over the bracket ends with a certain inertia. They are made of an elastomer of suitable stiffness or a polyurethane foam. Due to the design shown, elements with a certain dimension can be used for tires of different widths by the elements being threaded with different angular positions around the longitudinal axis of the yoke ends. Given the large variation of tire dimensions, it is suitable to manufacture elements of different dimensions. Other designs of the elements are of course conceivable within the framework of the invention, for example with a round cross-section, with the recess placed eccentrically. The jumpers are also suitably manufactured in different sizes to be able to be used in a large range of tires.

Claims

3,505 77-5 Patent claims

Device for increasing the grip between a vehicle tire (1) and a surface, in particular in the event of snow or ice on it, comprising at least two stirrups (2,3) of relatively rigid material, each stirrup being substantially V-shaped with the stirrup ends are bent around the wear surface of the vehicle tire from the first to its second side and a clamping means (4,5) is arranged for clamping the stirrups, characterized in that the stirrup ends support replaceable elements (6,7,8,9) of relatively rigid, but elastic resilient material for adaptation to different tire widths, ie distance between the first and second sides of the tire.

Device according to claim 1, characterized in that the elements (6,7,8,9) are formed with a recess (10) for threading over the bracket ends, the socket seen in a cross section, being placed asymmetrically.

Device according to Claim 1 or 2, characterized in that the elements (6,7,8,9) are at least partly made of an elastomer.

Device according to one of Claims 1 to 3, characterized in that the clamping means consists of an excipient band (4) and a buckle (5), which comprises a drum (14), rotatable relative to a frame part (15), relative to which a lever (16) is rotatable, coaxial with the drum, this being provided at least at one end with a ring half barbs (17), which partly cooperate with a first resilient locking member (18), guided in the frame part (15) , and partly cooperates with a second resilient locking member (19), controlled in the lever (16), that one end of the belt can be caused by the lever to be rolled up on the drum to a releasably locked position, while the other end of the belt is attached the frame part (15).