Rollerboard for road-skiing

Abstract: The rollerboard for road-skiing using a pair of poles has a board body (1) having two footholds (2) on the both sides of the longitudinal axis thereof. A front roller assembly (3) and a rear roller assembly (4) supported by and disposed under the board body. The front roller (6) is horizontally journaled by a front roller bracket (7) vertically pivoted on a plate (8) secured on the board body with a horizontal distance between the shaft (9) of the front roller and the pivot (10) of the front rollerbracket (7), and the rear roller assembly includes a rear roller (15) journaled by a rear rollerbracket (16) mounted on the board body under the region of the footholds. In addition, a brake means (5) is provided including at least a brake shoe bracket (21), whose one end is hingedly mounted at the rear end region of said board body and the other end is secured with a brake shoe (20) facing the ground, and at least a spring means (22) interposed between each said shoe bracket (21) and said board body (1) respectively to provide braking torerance.

Description: This invention relates to a rollerboard for road-skiing, more particularly to a rollerboard with which a rider can enjoy riding with both feet thereon using a pair of poles on even roads, as if he were skiing on the snow. Rollerskates, skateboards, rollerskis, etc., as means for riding on even lands such as road, have been widely known and used for a long time. However, because these are drived, controlled and balanced by actings of rider's body and legs, high speeds and intricate maneuvers are attainable only by highly skillful riders and it is difficult for a novice to attain proficiency therein. DE-B-1 175 129 discloses a roller shoe with a releasable brake and front and rear rollers mounted under the body of the roller shoe. Accordingly, an object of this invention is to provide a new type of rollerboard for road-skiing using a pair of poles to provide easy and safe ridings and exciting feelings from high speeds and intricate maneuvers even to a novice. This object is solved with the features of the claims. This device may be used as a sledgeboard on the ice or a skiboard on the snow or on the lawn. A pair of skateblades, a single skateblade or a skiplate may be fixedly mounted under the body of the rollerboard. This allows the rollerboard to be applied as a sledgeboard or a skiboard. Further objects and advantages of the invention can be more fully understand from the following detailed description taken in conjuntion with the accompanying drawings in which: Fig.1 is a perspective view showing a rollerboard according to this invention; Fig.2 is a bottom view of the rollerboard; Fig.3 is an enlarged perspective view of a front roller assembly; Fig.4 is an enlarged perspective view of a rear roller assembly mounted on the board body; Fig.5 is a perspective view showing a mounting example of the brake means according to the invention, partially taken to pieces; Fig.6 (A), (B) and (C) are perspective views of optional sliding means mountable under the board body according to embodiments of the invention, showing (A) one of a pair of skateblades, (B) a single skateblade and (C) a skiplate; Fig.7(A) is a perspective view showing a saddle assembly mountable on the board body according to an embodiment of the invention, and Fig.7(B) is a bottom view of this saddle with folded legs; and Fig.8 shows different riding forms using the rollerboard, (A) on the road, (B) on the ice with the skateblades and the saddle and (C) on the snow or the lawn with the skiplate. As shown in Fig.1 and 2, a rollerboard has a board body 1, which may be modelled in general on a sports car or an airplane to exhibit reduced air resistance and good apperance and has two footholds 2 formed thereon as a part of the board body 1 or adhered thereon as seperated parts. The footholds 2 are provided with numerous projections to improve friction with rider's feet. Under the board body 1, a front roller assembly 3 and a rear roller assembly 4 are disposed on the longitudinal axis of the board body 1. Moreover, brake means 5 is disposed on the rear end region of the board body 1. The front roller assembly 3 has a front rollerbracket 7 which is vertically pivoted on a mounting plate 8 as shown in Fig.3. The mounting plate 8 is fixedly mounted on the board body 1 by a plurality of holes 11 and screws. A front roller 6 is horizontally journaled through a roller shaft 9 by the front rollerbracket 7 with a horizontal distance between the contact point of the front roller 6 on the ground and the pivot 10 of the front rollerbracket 7. Thus, the front rollerbracket 7 can rotate on the pivot 10 within an angle with respect to the longitudinal axis of the board body 1 to allow the front roller 6 to change it's rolling direction, whereby during traveling the rider can voluntarily change his course by shoving the ground using his poles or by moving the gravity center of his body toward desired direction. Preferably, between the mounting plate 8 and the front rollerbracket 7, a bearing means is provided comprising a groove 12 formed in a circular arc on the mounting plate 8 and at least a ball 13 which is seated in a recess formed on the front rollerbracket 7 to interact with the groove 12. The bearing means guarantees the smooth rotation of the front rollerbracket 7 round on the pivot 10, while it receives the load on the front roller 6 to reduce or eliminate the bending moment on the front rollerbracket 7 and the povot 10 due to the load. Moreover, a tention spring 14 is preferably interposed between the front rollerbracket 7 and a point of the board body 1 on the longitudinal axis thereof, so that the rolling direction of the front roller 6 always corresponds with the longitudinal axis of the board body 1. Accordingly, the front roller 6 always holds the rolling direction in alignment with the straight advancing direction of the board body 1, and quickly returns after change of the advancing direction by the rider. As shown in Fig.2 and 4, the rear roller assembly 4 has a rear rollerbracket 16 mounted on the board body 1 by means of suitable fixing means, and a rear roller 15 is horizontally journaled by the rear rollerbracket 16. Here the longitudinal location of the rear roller shaft 17 lies under the region of the footholds 2. Thereby when the rider intends to brake the rollerboard during traveling, he can put his gravity on heel to allow the board body 1 to turn over rearwards, so that a brake means to be mentioned later, which is mounted on the rear end portion of the board body 1, is brought into frictional contact with the ground to brake the rollerboard. In order to damp possible shocks upon rider due to road unevenness, in an embodiment of the invention in connection with the rear roller assembly 4 as shown in Fig.4, a shock absorber means, especially at least a compression spring 19 is preferably provided between the rear rollerbracket 16 and the board body 1. To this end, advantageously, the front end of the rear rollerbracket 16 is hingedly mounted on the board body 1, and the compression spring 19 is interposed between the rear end of the rear rollerbracket 16 and the board body 1. In addition, in the rear end region of the board body 1, a brake means 5 is provided including at least a brake shoe bracket 21, as shown in Fig.5 as an example, whose one end is hingedly mounted at the rear end region of the board body 1 and the other end is secured with the brake shoe 20, and a spring 22 is interposed between each shoe bracket 21 and the board body 1 respectively, so that in the time of braking it allows the brake means 5 to elastically move longitudinally or vertically to some extent. This brake means 5 is brought into frictional contact with the ground when the rider puts his gravity on heels, as stated above, to brake the rollerboard during traveling. The brake shoe 20 is made of frictional materials having high friction coefficient on the ground and high stiffness, and it must be easily replaceable to be replaced with a new one when it has been worn down. According to the example illustrated in Fig.5, the brake means 5 has two brake shoe brackets 21, which are hingedly mounted at hinge pins 26 disposed in the rear end region of the board body 1, and the brake shoes 20 are secured on each brake shoe brackets 21 by fastners 27 and 28 facing the ground. A long bolt 23 passes longitudinally through the shoe bracket 21, the board body 1, the spring 22 and a washer 25 and is fastened by a nut 24 to compress the spring 22 to some extent. Accordingly, when the brake shoes 20 become frictionally contact with the ground, the shoe brackets 21 turn rearwards on the pivot pin 26 against the spring forces depending on the load on rider's heel. This makes the friction force of the brake shoes 20 on the ground strengthen by the aid of the elasticity of the spring 22 and allots the rider to control easily the braking force. Alternatively, for the same purpose, apart from the example shown in Fig.5, in which the shoe brackets 21 are vertically disposed and the springs 22 horizontally, it is also considerable that brake shoe brackets are horizontally mounted by hinges disposed under the board body 1 and springs are vertically interposed between the shoe brackets and the board body 1, so that the shoe brackets can be elastically moved upward. Moreover, according to an advantageous embodiment of this invention, a pair of subsidiary rollers 29 (Fig.2) is further provided, disposed on the both sides under the board body 1 and rolling in the same direction as the front and rear roller 6 and 15. These prevent dangers of possible overturn of the rollerboard and rider due to hitting of a side of the board body 1 against the ground during travelling, especially turning. Fig. 6 shows skateblades and a skiplate, which can be fixedly mounted under the board body 1 as sliding means on the ice, the snow or the lawn, according to an embodiment of this invention. In this drawing are showed (A) one of a pair of skateblades 30, (B) a single skateblade 31 and (C) a skiplate 32. On the ice, the rollerboard is applicable to a double-bladed or single-bladed sledgeboard by using a pair of the skateblades 30 or the single skateblade 31, and on the snow or the lawn to a skiboard by the skiplate 32. For mounting these on the board body 1, the board body 1 and the sliding means 30, 31 and 32 are provided with at least a interacting fixing means respectively. In the shown example in Fig.6, the sliding means 30, 31 and 32 have two or four inserts 33, being engaged in corresponding openings 34(Fig.2) formed in the bottom of the board body 1, and the fixing between the inserts 33 and the openings 34 is performed by lateral elastic projections 35 in the inserts 33 and corresponding recesses in the openings 34. However, the combination of engagement and fixing between the sliding means 30, 31 and 32 and the board body 1 is not limitted to the shown example, but can be considerated other various mechanisms, for example using hooks, pins, screws etc.. Fig.7(A) shows a saddle 36 mountable on the board body 1 according to an embodiment of this invention. This allows the rider to sit comfortably thereon during traveling. The saddle 36 has legs 37 which can be engaged in correspong fixing 38 (Fig. 1) formed on the board body 1. As shown in Fig.7(B), the legs 37 can be folded to provide handy carrying along. The rollerboard according to the invention, having the construction as described above, can be enjoyed as shown in Fig.8. On even lands such as roads, as shown in Fig.8(A), the rider can enjoy road-skiing with both feet thereon using a pair of poles, as if he were skiing on the snow. During riding, the rider can voluntarily change his course by shoving the ground using his poles or by moving the gravity center of his body toward desired direction. When the rider intends to brake the rollerboard during traveling, he can put his gravity on heel so that the brake means 5 is brought into frictional contact with the ground to brake the rollerboard. The spring 22 according to the embodiment shown in Fig.6 makes the friction force of the brake shoes 20 on the ground strengthen by the aid of the elasticity of the spring 22 and allows the rider to control easily the braking force. The shock absorber means according to the embodiment shown in Fig.4, especially at least a compression spring 19, which is provided between the rear rollerbracket 16 and the board body 1, can damp shocks on rider due to road unevenness to provide comfortable riding. In addition, a pair of subsidiary rollers 29 disposed on the both sides under the board body 1 can prevent possible overturn of the rollerboard and rider due to hitting of a side of the board body 1 against the ground during turning. Fig.8 (B) and (C) shows riding forms of the rollerboard on the ice with the skateblades 30 and the saddle 36 and on the snow or the lawn with the skiplate 32. The rider can enjoy also riding with a pair of poles in the same manner as normal road riding. As described above, the rollerboard for road-skiing using a pair of poles provides easy and safe ridings and exciting feelings from high speeds and intricate maneuvers, and can be used for training of sportsmen, especially skiers during the off-season. Moreover, the rollerboard is applicable to a sledgeboard on the ice or a skiboard on the snow or the lawn to provide variety to riding.

Claims: A rollerboard for road-skiing comprising: a board body (1) having two footholds (2) one on each side of the longitudinal axis thereof; a front roller assembly (3) and a rear roller assembly (4) supported by and disposed under the board body, said front roller assembly including a front roller (6) horizontally journalled by a front roller bracket (7) secured on said body(1) via a connecting means (8,10) with a horizontal distance between the shaft (9) of said front roller (6) and the connecting means (8,10) of said front roller bracket (7), and said rear roller assembly (4) including a rear roller (15) journaled by a rear roller bracket (16) mounted on said board body under the region of said footholds (2); and a brake means (5) including at least a brake shoe bracket (21), whose one end is hingedly mounted at the rear end region of said board body (1) and the other end is secured with a brake shoe (20) facing the ground, characterized in that a) the connecting means comprises a mounting plate (8) secured on said board body (1) and a vertical pivot (10) of the front roller bracket (7); and b) at least a spring means (22) acts between each said shoe bracket (21) and said board body (1), respectively, for allowing the rider to control easily the braking force. A rollerboard according to Claim 1, wherein said front roller assembly (3) has a bearing means comprising a groove (12) formed in a circular arc on said mounting plate (8) and at least a ball (13) which is seated in a recess formed in said front roller bracket (7) to interact with said groove (12). A rollerboard according to Claim 1 or 2, wherein a tension spring is interposed between said front roller bracket (7) and a point of the board body (1) on the longitudinal axis thereof. A rollerboard according to Claim 1, 2 or 3, wherein said rear roller assembly (4) is provided with at least a shock absorber means (19) between said rear roller bracket (16) and said board body (1). A rollerboard according to any one of Claims 1 to 4, wherein a pair of subsidiary rollers (29) is further provided under the both sides of said board body (1). A rollerboard according to any one of Claims 1 to 5, wherein a pair of skateblades (30), a single skateblade (31), or a skiplate (32) are fixedly mountable under said board body (1). A rollerboard according to any one of Claims 1 to 6, wherein a saddle (36) is mounted on the upsides of said board body (1).

Inventors: HWANG SUN-IK, HWANG, SUN-IK
Applicants: HWANG SUN IK, HWANG, SUN-IK
Application year: 1991
Main classification: A63C17
IPC codes: A63C17