DE8890151U1 - Removable device for preventing bicycle wheels from slipping - Google Patents

Description

^ Removable device for preventing slipping of bicycle wheels

The invention relates to a removable device for the anti-slip protection of bicycle wheels with pneumatic tires consisting of two tensioning cables, each attached to a tire sidewall and running around it, between which curved, relatively stiff crossbars crossing the crown of the pneumatic tire are attached to a tensioning cable on their sides, whereby the crossbars are connected to a tire provided with a structure that increases the height and is arranged in a ladder-like manner at a peripheral distance.

DE-Ul 87 12 018 describes a "profile tape against snow and ice for two-wheeled vehicles". It is This is a removable anti-slip device of the type mentioned above, in which tensioning cables are already provided that support crossbars arranged like ladder rungs. The crossbars are each provided with raised, jagged web sections through which the Steel cables are pulled. The steel cables are tensioned and connected using a clamp. It has been shown that devices of the known type are practical, but wear out relatively quickly, leading to failures and breakages.

The task is therefore to develop a device that is as wear-resistant as possible and has a long service life

for anti-skid protection that can be used both in snow conditions and, at least for a short time, on normal roads. In particular, the device should also be suitable for improving the driving characteristics of so-called off-road bicycles on slippery terrain.

This object is achieved in a removable anti-slip device of the type mentioned at the beginning by the fact that the crossbars are made of deformed strip material sections which are rolled up at their side edges to form a loop that encloses the tensioning cable, that the crossbars have at least one pointed body or grip lug on their surface lying between the tensioning cables as a friction-increasing structure, and that the tensioning cable ends can be tensioned via a connection.

The above-mentioned features provide a solution that is adapted to the requirements of winter operation, particularly with regard to wear resistance and long service life, without having to make compromises with regard to good anti-slip protection.

Preferably, a tension cable end connection will be designed as a threaded socket connection; however, it is also possible, for example, to choose a claw-step closure.

Instead of a tensioning cable, a tensioning band can be used that is attached to the sidewalls of the pneumatic tire. The distances are designed in such a way that the bicycle dynamo or a rim brake are not impaired in the least.

The so-called pointed bodies and handle warts are cones, truncated cones, pyramids or pyramids— blunt6, which preferably contain sweet &agr;&egr;&idiagr;&Ggr;&igr; material of the Qusr—

Webs are formed. This can be done by deep drawing, for example.

It should be noted that it is already known from older patent literature (DE-A 95 493) to provide crossbars or at least parts of them with raised tips or the like. However, it should be emphasized that in the present case it is essential to provide a bicycle tire with a light, low-wear and relatively inexpensively manufactured anti-skid and slip device. The much more robust and therefore more expensive solutions provided for car tires cannot be used in the main.

Further subclaims are explained in the following description. The description is based on the drawing, which includes the following figures:

Figure 1 shows a part of a bicycle wheel with a

Pneumatic tire equipped with an anti-skid device, in side view;

Figure 2 the detail of Figure 1 in plan view; 25

Figure 3 shows the device in the area of a connection of the tension cable ends in side view;

Figure 4 a connection of tension cable ends in plan view; 30

Figure 5 shows a first embodiment of a crosspiece;

Figure 6 shows a second embodiment of a crosspiece;

Figure 7 a claw-step closure for the tensioning cable ends.

Figure 1 shows part of a bicycle wheel 10 in which a pneumatic tire 1 is clamped onto a rim 4. A device 11 for preventing bicycle wheels from slipping is placed on the outside of the pneumatic tire 1 and extends around the periphery of the pneumatic tire 1. The device 11 consists of two tensioning cables 2, 2' which each rest against a tire flank and run all the way around and can preferably be inserted into an existing groove or slot in the tire profile. Curved, relatively stiff webs 3 which cross the apex of the pneumatic tire are arranged between the tensioning cables 2, 2'. In the above embodiment fa, these consist of a strip material section which is made of stainless steel. Stainless steel is also the optimal material for the tensioning cables 2, 2 ^' . The crossbars 3 are arranged at a uniform distance, for example an average of 10 cm, on the periphery like ladder rungs.

Figures 3 and 4 show a connection between the tension cable ends 12, 13. A threaded sleeve connection 5, 5 has been chosen for the vcrlis^s^dsn FmII to eliminate the wear and tear. This consists of a threaded bolt 5 and a threaded sleeve 5, which can be freely rotated relative to the tension cable end 12. It is preferably provided with a hexagon polygon on the outside to make it rotatable with a wrench. Since the main part of the threaded bolt 6 disappears in the threaded sleeve, it is suitable for corrosive materials such as road salt.

cannot be reached and therefore remains capable of twisting. The contact surface of the threaded sleeve connection is also kept very small, so that no significant resistance will occur when the pneumatic tire with the anti-skid device rolls.

Figure 5 shows a first embodiment of a crossbar 3, which consists of a deformed band material that has a bent-up jagged structure 14 on the curved edges. On the sides, the material of the crossbars is rolled up into eyelets 15, 15' and there surrounds the tensioning cable 2. As a friction-increasing structure, the crossbar 3 is provided with three grip lugs 8, A i *-, L/a/&igr;&lgr;&Iacgr; e*· utnnf arf �iacgr; na ITnrnA*- C jn«1 linn ir» /3 &Lgr; C Manorial

crossbar are pressed in.

Figure 6 shows another embodiment of the crosspiece, designated 3'. Five conical pointed bodies 7 are provided, which are mounted separately on

the material is welded on.
15

If individual crossbars 3, 3 ¹ are to be detached from the tensioning cable, they can be easily removed by bending the eyelets with a suitable square tool and

be reinstalled accordingly. 20

Instead of the threaded socket connection between the tension cable ends, it is also possible to use a flanged step closure 25, 25 to connect the tension cable ends 12, 13

! The closure consists of a with several

S <■ 25 step-like arranged engagement openings 27 provided step tab 25 made of embossed and punched sheet metal and a claw tab 26 made of the same material, which has a claw 28 at one end, which can be hooked into one of the engagement openings 27 and thereby connects the tensioning cable ends 12, 13 to one another and tensions the cable 2 as a whole. This arrangement can also be built so flat that there is no risk of damage or failure.

As tests have shown, the new devices are practical and significantly improve winter use of bicycles. The individual

A device can be clamped onto the tire without removing the wheels after letting out some air and then tightened after inflating. One or both of the wheels can be fitted with such a device.

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Claims (1)

Expectations : 1. Removable device for preventing bicycle wheels with pneumatic tires from slipping, consisting of two tensioning cables, each attached to a tire flank and running around it, between which curved, relatively stiff crossbars crossing the apex of the pneumatic tire are each attached to a tensioning cable on their sides, the crossbars being provided with a friction-increasing structure and arranged at a peripheral distance like ladder rungs, characterized in that the crossbars (3, 3 ¹ ) are made of deformed strip material sections which are rolled up at their side edges to form an eyelet (15, 15') enclosing the tensioning cable, that the crossbars (3, 3 ¹ ) carry at least one pointed body (7) or gripping lug (8) as a friction-increasing structure on their surface lying between the tensioning cables and that the tensioning cable ends (12, 13) can be tensioned via a connection (5, 6; 25, 25). 2. Device according to claim 1, characterized in that the connection is a threaded socket connection (5, 6). 3. Device according to claim 1, characterized in that the connection is a claw-step closure (25, 26). 4. Device according to claim 1, characterized in that the pointed bodies (7) or grip lugs (8) are formed from the material of the transverse webs (3, 3'). 5. Device according to claim 1, characterized in that tensioning cables ¹ (2, 2 ¹ ) and/or crossbars (3, 3 ¹ ) consist of stainless steel. 6. Device according to claim 1, characterized in that the eyelets (15, 15') are rolled inwards towards the top of the crossbars (3, 3').