DE29912280U1 - Roller skate - Google Patents

Description

Conventional ice skates can be assumed to be well-known for people's athletic locomotion. They are characterized by the fact that they have an empirical length of around 30 cm, and are therefore able to support the body weight of a skater as a single blade. If they were too long, they would not be able to cause the melting process necessary for the gliding movement of an ice skate; if they were too short, the surface pressure would be too great, the blade would sink too deeply into the ice and lateral guidance would hardly be guaranteed. There are two variants in the cross-section of these blades:

"I.For ice hockey skates, a 90-degree grind is required due to the risk of injury, i.e. both sides of the blade meet the running surface at less than 90 degrees.

2. The grind of the figure skates, also known as hollow grind, offers the advantage of cutting more precisely into the ice because it works with a wedge angle of less than 90 degrees.

The cross-section of this type of grinding is also known as concave. These types of grinding have the following in common: The pressure exerted by the skater's body weight on the ice via the blade creates a water-based gliding film on which the blade glides over the ice with almost no friction. This water film freezes back into ice immediately after the pressure is removed.

State of the art inline skating:

In recent years, the conventional roller skates, which are characterized by having a total of four wheels on two consecutive axes per shoe, have been replaced by the new roller skates known as inline skaters, which are characterized by having four wheels on four consecutive axes under the center plane of the sole of the shoe. Their advantages over the conventional roller skates described above are clearly that the athlete's ankle joint can be stretched. This allows significantly higher acceleration values and cornering speeds to be achieved.

The rolling movement of the freely rotating inline skater wheels is created by the fact that there must be a friction value between the ground surface and the wheel. Inline skater wheels do not work on ice because the coefficient of friction between the wheel and the ice is too low. Neither longitudinal nor lateral guidance is possible. This is due to the spherical shape of the wheels and the flexibility of the material to a certain extent. This shape and the flexibility of the material cause the wheels to have too large a contact surface on the ice. The physical definition of pressure is force per area. Since the skater's weight cannot be increased, it is impossible for him to melt the ice beneath him if the surface is too large.

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In order to combine the advantages of sliding and rolling movements, the following invention is proposed.

Description of the new ice inline skaters (picture 1):

On a conventional inline skating shoe 1 there is an axle carrier 2 with a brake block 3 that is firmly connected to the shoe. This axle carrier 2 preferably has four axle mounts 4 and is preferably provided with spikes 5 at its front lower end.

These axle mounts 4 carry sliding or rolling bearings that ensure that the new rollers 6 can rotate freely and at the same time absorb axial and radial forces. In order to be able to carry out a pure sliding movement, these bearings must be designed to be fixable. In the new invention, the conventional rollers 6 are replaced by rollers (Figure 2 with 7) made of a suitable material that are able to produce the required water lubricating film on ice with sufficient pressure due to their external shape and suitable diameter.

Among the cross-section variants of these rollers tested, the following variants showed the best results.

Variant 1 of the knife grind (picture 2)

Variant 2 of the 90 degree grind (picture 3)

Variant 3 of the hollow grinding (picture 4)

Variant 4 of the ninety degree cut with attachment ring (picture 5)

Variant 5 of the hollow grinding with insert ring (Figure 6)

Variant 6 of the hollow grinding with attachment ring (Figure 7)

Claims (5)

1. A roller gliding shoe similar to an inline skater shoe, characterized in that rigid, preferably ground, solid bodies can be attached to its axles, which are able to either roll or slide on different surfaces, since they are either freely rotatable or can be locked in their rotation. 2. Roller sliding shoe according to the preceding claim, characterized in that one or more of these rotatable bodies, also called rollers, are mounted approximately in the central longitudinal axis of the shoe underneath it. 3. Roller skate according to one of the preceding claims, characterized in that it can be driven either with its original inline skater wheels and preferably some or all of these wheels can be exchanged for the locking or freely rotating, new type of wheels. 4. Roller sliding shoe according to one of the preceding claims, characterized in that hollow-ground rollers can accommodate rings made of any material in order to be able to use the new type of ice rollers in their ability to rotate on other surfaces. 5. Roller sliding shoe according to one of the preceding claims, characterized in that attachment rings which can be attached to ninety degree ground or hollow ground rollers partially overlap the roller flanks and can be fixed there.