Abstract:
Disclosed is a novel roller sled or roller ski. One may ride a mono-sled on the ice or ski on the snow, they can enjoy a riding play on an asphalt road, a concrete-paved road or a level ground.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates, in general, to a roller sled and roller ski and methods of using the same which people of all ages and both sexes can enjoy. In particular, the method relates to a roller sled and roller ski in which two or more rollers are mounted to a panel of a certain size in a row. One may use the roller sled and roller ski on an asphalt road, a concrete paved road or a level ground.  
       BACKGROUND OF THE INVENTION  
       [0002]     A conventional roller sled has two or more rollers in a row and a blade in the middle of the panel so that it can be used on the ice. The roller sled was published on Sep. 25, 2002 for Korean utility model registration no. 233965 and it comprises “a roller sled with shafted rollers; wherein a main frame is provided on the lower surface of a step panel with holes formed on the main frame and two or more rollers are shafted to the holes of the main frame with bearings; and a break pad made of the material having a frictional force and small abrasive property is mounted slopingly on a lower surface of a rear part of the step panel”, and “a conventional stick with a handle detachably assembled; wherein a moving pin having a pin head of which diameter is bigger than that of the body is formed and the sharp portion of it is projected downwardly, and the pin head is inserted to a slide slot of a lower part and elastically biased by a spring”. The conventional roller sled and stick can be used easily on a concrete-paved open space and road, or an asphalt concrete-paved open space and road in addition to the ice. When riding the roller sled, the roller sled is accelerated with a pair of sticks while standing on the roller sled with balance. The conventional roller sled has two rollers in the middle of the step panel having a main frame, an outer frame, a roller cover and pad housing.  
         [0003]     The conventional sled has a number of drawbacks. It takes a lot of skill for a user to be able to easily maintain balance and ride on, e.g., a the concrete-paved road. Secondly, if the sled leans to one side when riding with two rollers, the one side end of the step panel comes into contact with the surface of the road and is damaged. As a result, safety accidents may happen. Thirdly, when riding the sled, a user may easily slip on an upper surface of the step panel. In addition, it is difficult to recognize the conventional roller sled at night and traffic accidents may happen.  
       OBJECTS OF THE INVENTION  
       [0004]     It is an object of the present invention to provide a roller sled, in which sub-wheels are detachably mounted on both sides of a lower surface of the step panel and where a user who may be an unskilled person, may maintain the balance more easily when riding it. If the user doesn&#39;t need the sub-wheels, he may separate them from the step panel and ride the roller sled with only rollers.  
         [0005]     It is another object of the present invention to provide a roller sled, in which the rollers are luminous rollers that emit light during rotation so that it is easy to recognize the roller sled at night, and form slots on a roller cover.  
         [0006]     It is another object of the present invention to provide a roller sled where there is no concern that the user&#39;s shoes slip and that the roller sled stops promptly when the step panel leans to one side while the user is riding it and prevents safety accidents from occuring.  
         [0007]     It is another object of the present invention to provide a roller ski using roller sled, in which the user&#39;s feet are placed on it as the conventional ski and the user can enjoy the roller ski in a place which doesn&#39;t have snow.  
       SUMMARY OF THE INVENTION  
       [0008]     The invention is directed to a roller sled, comprising a main frame on the lower surface of a step panel with holes formed on the main frame and two or more rollers shafted to the holes of the main frame with bearings; a break pad made of material having a frictional force and small abrasive property, wherein said pad is mounted slopingly to a pad housing of the lower surface of a control unit provided on the rear part of the step panel wherein said rollers are luminous rollers that emit light from inner lamps during a rotation thereof and wherein a plurality of emitting slots are formed on a roller cover which is projected upwardly on the step panel and covers the rollers.  
         [0009]     Furthermore, the invention is directed to a riding device with shafted rollers comprising a roller ski comprising a roller sled, in comprising main frames on the lower surface of step panels with holes formed on the main frames and two or more rollers shafted to the holes of the main frames with bearings; and fastening units on the middle upper surface between the rollers so that both of user&#39;s shoes are placed respectively on the step panels. 
     
    
     BRIEF DESCRIPTION OF THE FIGURES  
       [0010]     The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:  
         [0011]      FIG. 1  is a perspective view illustrating a roller sled in accordance with an embodiment of the present invention.  
         [0012]      FIG. 2  is a plan view in accordance with an embodiment of the present invention.  
         [0013]      FIG. 3  is a side view in accordance with an embodiment of the present invention.  
         [0014]      FIG. 4  is a bottom view in accordance with an embodiment of the present invention.  
         [0015]      FIG. 5  is a side view illustrating a roller sled in accordance with another embodiment of the present invention.  
         [0016]      FIG. 6  is a bottom view in accordance with another embodiment of the present invention.  
         [0017]      FIG. 7  is a side view illustrating a using state of a roller sled in accordance with another embodiment of the present invention, when it stops.  
         [0018]      FIG. 8  is a front view in accordance with another embodiment of the present invention.  
         [0019]      FIG. 9  is a side view illustrating a roller ski of the present invention in use.  
         [0020]      FIG. 10  is a plan view illustrating a roller ski of the present invention in use. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0021]     Based on the present invention, the above objects can be accomplished by a provision of a roller sled, in which a main frame is provided on the lower surface of a step panel with holes formed on the main frame and two or more rollers are shafted to the holes of the main frame with bearings; a break pad made of material having a frictional force and small abrasive , said pad is mounted slopingly to a pad housing of the lower surface of a control unit provided on the rear part of the step panel; wherein said rollers are luminous rollers that emit light from inner lamps during a rotation thereof; and wherein a plurality of emitting slots are formed on a roller cover which is projected upwardly on the step panel and covers the rollers.  
         [0022]     A depression may be formed inwardly on the upper surface of the step panel and an antislip sheet having a strong frictional force like a rubber is attached to the depression.  
         [0023]     The control unit is provided on both sides of the rear part of the step panel and break pads are inserted and mounted respectively to pad housings of the control unit provided on both sides.  
         [0024]     Bosses having a plurality of locking slots are provided on each of both sides of a lower surface of the step panel and sub-wheels rotating freely are shafted to the bosses by sub-wheel brackets.  
         [0025]     The sub-wheels are located more highly than lower ends of the rollers so that the step panel may easily rotate in a direction of rotation when changing the course.  
         [0026]     The sub-wheel brackets comprise mounting panels having locking holes aligned with and mounted to the locking slots of the bosses by setscrews, wheel covers, in which their upper ends are shafted to the mounting panels and its lower ends extend downwardly to cover the sub-wheels, and locking rivets shafting the sub-wheels on both sides of lower ends of the wheel covers.  
         [0027]     Side break pads made of the material having a frictional force and small abrasive property and projected downwardly in length of 20-50 mm are mounted on front and rear parts of the lower surface of the step panel so that the lower end of the step panel may not be in contact with the ground surface toward which the step panel leans when the step panel rotates.  
       EXAMPLE  
       [0028]     A roller sled  10  according to the present invention comprises a main frame  11  which is provided on the lower surface of the step panel  16  with holes formed on the main frame  11 . Two or more rollers  20 , which are luminous rollers that emit light from inner lamps during a rotation thereof, are shafted to the holes of the main frame  11  with bearings. A break pad  30  made of the material having an excellent frictional force and a small abrasive property is mounted on the lower surface of the rear part of the step panel  16 . A plurality of emitting slots  13   a  are formed on a roller cover  13  which is projected upwardly on the step panel  16  and covers the rollers  20 . A depression  16   a  is formed inwardly on an upper surface of the step panel  16  and an antislip sheet  16   b  having a strong frictional force like a rubber is attached to the depression  16   a . Bosses  16   c  having a plurality of locking slots  16   d  are provided on each of both sides of a lower surface of the step panel  16  and sub-wheels  40  rotating freely are shafted to the bosses  16   c  by sub-wheel brackets  41 .  
         [0029]     The sub-wheels  40  are located more highly than lower ends of the rollers  20  so that the step panel  16  may rotate easily in a direction of rotation when changing the course of making a turn.  
         [0030]     The sub-wheel brackets  41  comprise mounting panels  42  having locking holes  43  aligned with and mounted to the locking slots  16   d  of the bosses  16   c  by setscrews  44 , wheel covers  45 , in which its upper ends are shafted to the mounting panels  42  and its lower ends extend downwardly to cover the sub-wheels  40 , and locking rivets  46  shafting the sub-wheels  40  on both sides of lower ends of the wheel covers  45 .  
         [0031]     The break pads  30  made of the material having a frictional force, small abrasive property and projected downwardly in length of 20-50 mm are mounted on front and rear parts of the lower surface of the step panel  16 . The side break pads  30  are used for protecting the step panel  16  so that the lower end of the step panel  16  may not be in contact with the ground surface toward which the step panel  16  leans when rotating.  
         [0032]     The roller sled  10  of the present invention has a number of uses. When a user rides the roller sled  10  according to the present invention, sticks of which lower ends are made of rubber for safety may be provided to accelerate the roller sled  10  while standing on the roller sled  10  with balance. The user holds the sticks with both hands, places the roller  20  of the roller sled  10  toward the ground, and then puts one foot on the step panel  16 .  
         [0033]     The user may put his right foot on a right side of the step panel  16  or may put his left foot on a left side of the step panel  16 . Balance may be maintained by using sticks with both hands. Force is added to the sticks as the user pushes his body forward.  
         [0034]     The roller sled  10  carrying weight maintains the balance by the centrifugal force when the rollers  20  start rolling and by a strong and quick poling motion of the user. The user may gradually accelerate the roller sled  10  and enjoy riding it even on the level ground. When attempting to stop, i.e., in case that user wants to reduce speed or stop while riding the roller sled  10 , the user may place his heels on the control unit  14 , pull his hip backwards and compress the control unit  14  by the heels while raising the front parts of the feet. As a result, a front part of the roller sled  10  is elevated and simultaneously a rear part of comes down. Therefore, the break pads of a lower surface of the control unit  14  come into contact with the ground and by the degree of friction, the roller sled  10  may be decelerated or stopped safely.  
         [0035]     Meanwhile, as the break pads  30  are inserted partially inside a pad housing  15  of the control unit  14 , when applying the brake, the pad housing  15  strongly grasps the brake pads  30  so that the brake pads  30  support much force and simultaneously disperse the frictional force. Accordingly the pad housing  15  prevents the break pads  30  from breaking or being damaged.  
         [0036]     The control unit  14  may be provided on both sides of the rear part of the step panel  16  and the break pads  30  are inserted and mounted respectively to pad housings  15  of the control unit  14  provided on both sides.  
         [0037]     Since the user needs a lot of exercising to maintain the balance and ride the roller sled  10  on the level ground, the user may use the roller sled  10 , in which sub-wheels  40  are mounted on each of both sides of the lower surface of the step panel  16 . Here, locking holes  43  are aligned with the mounting panels  42  on the sub-wheel brackets  41  and mounted to the locking slots  16   d  of the bosses  16   c  projected on lower both sides of the step panel  16  with setscrews  44 .  
         [0038]     The sub-wheels  40  having the sub-wheel brackets  41  rotatably shafted on each of both sides of a lower surface of the step panel  16  supports the user who is an unskilled person easily losing balance.  
         [0039]     If with the sub-wheels  40 , the user continuously repeats balancing on the upper surface of the step panel  16 , leans to one side when stopping or riding the roller sled  10  slowly forward, he may easily ride the roller sled  10  without the sub-wheels  40 .  
         [0040]      FIG. 9  is a side view illustrating the use of a roller ski  1  of the present invention and  FIG. 10  is a plan view illustrating a using state of a roller ski  1  of the present invention.  
         [0041]     The roller ski  1  using the roller sled  10  of the present invention is a riding device with a pair of shafted rollers  20 . Main frames  11  are provided on the lower surface of step panels  16  with holes formed on the main frames  11  and two or more rollers  20  are shafted to the holes of the main frames  11  with bearings. Fastening units  60  are provided on the middle upper surface between the rollers  20  so both of the user&#39;s shoes are placed respectively on the step panels  16 .  
         [0042]     The fastening units  60  comprise a heel support  61  mounted on the upper surface of the step panel and contacted with the heels of the user&#39;s shoes and at least one fastening band  62 , in which its both sides are mounted in front of the heel support  61  and fastened by buckles  63  so that the user&#39;s shoes may be placed on the upper surface of the step panel  16 .  
         [0043]     The rollers  20  are luminous rollers  20  that emit light from inner lamps during a rotation thereof and a plurality of emitting slots  13   a  formed on a roller cover.  
         [0044]     As apparent from the above description, the roller ski  1  using the roller sled  10  is formed with the space between a front roller  20  and a rear roller  20 . It is desirable that the width of the roller ski  1  is formed narrowly and the length of the roller ski  1  is formed longer than the width, but it may be constructed to have a shorter length.  
         [0045]     Shoes  70  are fastened with at least one fastening band  62 . The heels of the shoes  70  are placed on the step panel  16  to be in contact with the heel supports  61  on a central upper surface of the step panel  16 . The user then fastens the fastening band  62  by the buckles  63  mounted to one end of the fastening band  62 , holds sticks to which slip preventing members are mounted with both hands, pushes them backwards. Accordingly the user may move forward with the roller ski  1  and use the ski on the level ground.  
         [0046]     Also, if the user wants to stop while riding, while he makes the front parts of both roller skis  1  close inwardly or leans the step panel  16  to one side so that the center of gravity moves to one side, he may stop riding the roller ski  1  by the frictional force between the roller  20  and the ground.  
         [0047]     As apparent from the above description, the roller sled and roller ski using the same according to the present invention provides a number of advantages. The user who is an unskilled person may maintain the balance and easily ride the roller sled and roller ski by the sub-wheels or ride them without the sub-wheels. It is easy to recognize the roller sled and the roller ski when riding them at night. The shoes of the user don&#39;t slip. Even though the step panel leans to one side, it may be stopped promptly, therefore, the safety accidents may be prevented. The roller sled and roller ski of the present invention provides another advantage in that both of the user&#39;s shoes may be placed respectively on a pair of roller skis.  
         [0048]     Thus, the user can enjoy them everywhere and it makes adults feel nostalgia of their childhood and it provides children and teenagers with promotion of their health and sound playing culture.  
         [0049]     While the invention has been shown and described with reference to a certain preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.  
         [0050]     Various references are cited herein, the disclosures of which are incorporated by reference in their entireties.