The present invention relates generally to a wheel in which a heterogeneous material is inserted and, more particularly, to a wheel having a structure in which a ring-shaped auxiliary wheel formed of a metallic material is inserted into and coupled to an outer circumferential surface of a main wheel formed of a plastic material.
Generally, representative equipment of leisure sports includes, for example, roller-skates, inline-skates, skateboards, essboards, kickboards, or the like, which are equipped with wheels formed of urethane to enjoy speed. Such leisure sporting equipment has a structure in which wheels are installed onto boots or boards to roll over the ground. Among the equipment having such a structure, a wheel of an inline skate will be exemplarily explained as follows. First, an inline skate has a structure in which a curved frame is provided on a lower portion of a boot, a plurality of coupling holes are formed in opposite sides of the frame, and a plurality of wheels are rotatably installed onto coupling axes inserted through the coupling holes. Such inline skates have been widely used by various age groups from children to the older adults, and they are especially popular as family leisure sporting equipment.
Accordingly, the present invention has been made keeping in mind the above problems occurring in the related art, and an object of the present invention is to provide a wheel having a structure in which a ring-shaped auxiliary wheel formed of a metallic material is inserted into and coupled to an outer circumferential surface of a main wheel formed of a plastic material, thereby increasing a rotation speed of the wheel due to a local mass increase, which is caused by the insertion of the metallic material into the wheel, at the same volume by using the difference in specific gravity (density).
Another object of the present invention is to provide a wheel having a structure in which a ring-shaped auxiliary wheel formed of a metallic material is inserted into and coupled to an outer circumferential surface of a main wheel formed of a plastic material, thereby facilitating the variation of mass compared to a conventional structure formed of a single material through the difference in specific gravity (density) between the main wheel and the auxiliary wheel, thereby further improving driving performance.
In order to accomplish the above objects, according to an aspect of the present invention, a wheel includes: a main wheel having a stepped core part and a tire formed of a urethane material as an outer surface thereof; and an auxiliary wheel having a ring shape and provided on a circumferentially-central portion of an outer surface of the main wheel, on which the tire is provided, in an insertion manner, wherein the main wheel is formed of a plastic material, and the auxiliary wheel is formed of a metallic material that is different from the material of the main wheel.
The auxiliary wheel and the main wheel may have a difference in specific gravity (density) and the metallic auxiliary wheel may be coupled to the outer surface of the main wheel so as to increase a rotation speed of the wheel due to a local mass increase at the same volume.
The main wheel may be provided with a protruded ring-type recess in which the auxiliary wheel is inserted into and coupled to along a circumferentially-central portion of an outer surface of the recess, wherein the auxiliary wheel protrudes farther than the protruded ring-type recess.
The main wheel may be configured such that the auxiliary wheel is integrally embedded in the circumferentially-central portion of the outer surface of the main wheel.
The auxiliary wheel having the ring shape may be formed of any one material selected from the group including steel, aluminum, tungsten, brass, titanium, and stainless steel.
The wheel in which the auxiliary wheel is disposed in the main wheel may be used for extreme sports, inline-skating, skateboarding, essboarding, kickboarding, or the like.
According to the present invention, the wheel is configured such that the ring-shaped auxiliary wheel formed of a metallic material is inserted into and coupled to the outer circumferential surface of the main wheel formed of a plastic material, thereby increasing a rotation speed of the wheel due to a local mass increase, which is caused by the insertion of the metallic material into the wheel, at the same volume by using the difference in specific gravity (density).
According to the present invention, such a configuration facilitates the variation of mass compared to a conventional structure formed of a single material through the difference in specific gravity (density) between the main wheel and the auxiliary wheel, thereby further improving driving performance.
Hereinbelow, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to allow an ordinary skilled person in the art to easily implement the invention. In the following description, it is to be noted that, when the functions of conventional elements and the detailed description of elements related with the present invention may make the gist of the present invention unclear, a detailed description of those elements will be omitted. Further, the same reference numerals refer to similar elements throughout the drawings.
In addition, the expression ‘the connection of a first element with a second element’ may include embodiments in which the first and second elements are formed in direct contact, and may also include embodiments in which additional element may be formed between the first and second elements, such that the first and second elements may be connected indirectly. It will be further understood that the terms “comprises” and/or “comprising”, or “includes” and/or “including”, when used in this specification, specify the presence of stated features, but do not preclude the presence or addition of one or more other features.
The main wheel 110 includes a stepped core part 111 and a urethane tire 101 that is an outer circumferential part thereof. The main wheel 110 is formed of a plastic material, which is different from a metallic material of the auxiliary wheel 20 to be described later. As shown in
The auxiliary wheel 120 is a ring-shaped member that is provided along a circumferentially-central portion of the outer surface of the main body 110, on which the tire 101 is provided. The auxiliary wheel 120 may be formed of a metallic material that is different from the plastic material of the main wheel 110. That is, the auxiliary wheel 120 may be formed of any one metallic material selected from the group including steel, aluminum, tungsten, brass, titanium, and stainless steel. In addition, as shown in
According to the present invention, the wheel is configured such that the auxiliary wheel 120 and the main wheel 110 have a difference in specific gravity (density), and the metallic auxiliary wheel 120 is fixedly inserted into, or otherwise integrally embedded in the protruded recess on the outer surface of the main wheel 110, thereby increasing a rotation speed of the wheel due to a local mass increase at the same volume, which is caused by the insertion of the metallic material into the wheel. Such a configuration facilitates the variation of mass compared to a conventional structure formed of a single material through the difference in specific gravity (density) between the main wheel and the auxiliary wheel, thereby further improving driving performance. That is, since a metallic material has higher specific gravity than a urethane material, when the metallic auxiliary wheel is coupled to the urethane wheel, an increase in local mass occurs at the same volume, thereby increasing a rotation speed of the resultant wheel.
The wheel in which the auxiliary wheel formed of a heterogeneous material is disposed in the main wheel 110 can be used for extreme sports, inline-skating, skateboarding, essboarding, kickboarding, or the like.
The present invention disclosed herein may be diversely modified and applied by an ordinary person skilled in the art to which the present invention pertains, and the scope of technical spirit of the invention should be defined by the accompanying claims.
Number | Date | Country | Kind |
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10-2013-0095059 | Aug 2013 | KR | national |
Filing Document | Filing Date | Country | Kind |
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PCT/KR2014/005368 | 6/18/2014 | WO | 00 |