Patent Application
20050121872
The present invention relates to skateboards and more specifically to portable skateboards.
Skateboard riding has become an increasing popular pastime, especially among school age children. Such an activity provides a means of transportation and outdoor exercise.
Conventional skateboards consist of an elongated deck (as made of wood or fiberglass) with two truck and wheel assemblies mounted under the deck roughly shoulder width apart. The wheels are typically polyurethane and are mounted on an axle of a pivoting truck assembly. The truck includes a resilient ring that allows the truck to pivot about its connection with the deck, allowing the skateboard to tilt slightly over the wheels. This tilting causes radial displacement of the axles, allowing the board to turn. Decks range in width from 6 to 12 inches and from 2 to 3 feet in length. Much longer oversized boards, known as long-boards, are also used.
The size and weight of skateboards presents certain disadvantages. When not in use the boards most often are hand carried. In public commercial establishments, such as convenience stores and movie theaters, skateboards present difficulties for their user. The skateboard presents a hazard of knocking items off surfaces or bumping customers if the user is not careful. In addition if the user places the skateboard in an isle or other walkway, the board is a danger to other customers. In addition, the board is difficult to transport and store when not in use. For example on busses or trains, the user must ride carrying the skateboard or with the skateboard in the user's lap. Conventional skateboards are quite sizable and do not fit in a standard backpack and are difficult to fit into a school locker.
A number of different attempts have been made to provide a skateboard that is more portable. U.S. Pat. No. 5,505,474 to Yeh discloses a folding skateboard having a plurality of frame bars connected by a series of links. At a front and rear end of the frame bars are rotatable connectors onto which a wheel assembly is mounted. The rider stands on a platform mounted on the connector over the wheel assembly. A number of pins are used to hold the frame bars in position. The pins may be removed to fold the bars of the skateboard.
U.S. Pat. No. 5,769,438 discloses a skateboard having a front, middle and rear sections. A hinge joins the front section to the middle section and a second hinge joins the middle section to the rear section. Wheel assemblies are attached to the front and rear sections of the skateboard. The two hinges allow folding of the board, making the board more compact.
U.S. Pat. No. 5,971,406 discloses a foot supporting skate device. This device includes a skate, such as an inline skate, worn on a first foot. The skate includes a platform extending from the rear of the skate and having an additional wheel. A rider may position a second foot on this platform so that the skate may be used alone. The second foot could be used to propel the rider, as would be done with a skateboard.
U.S. Pat. No. 6,131,931 to Globerson et al. discloses a folding skateboard having front and back wheel and truck assemblies. The deck of the skateboard includes three sections. A first section is about half the length the board, and middle section having a width that is about the height of the wheel and truck assembly and the third section making up the remaining length of the skateboard. The sections are connected by hinges such that the board may be folded. In the folded position, the wheels are aligned side by side. This allows the board to compact to a size about half the size of the extended board, and one deck thickness greater in depth than an assembled board. Clips or fastening rods may be used to secure the board when it is in the open position.
U.S. Pat. App. Pub. 2003/0127816 A1 to Schnuckle at al. discloses a foldable skateboard. This device includes a pair of front wheels on an articulated strut attached to a central platform. A pair of rear wheels on a hinged support is also attached to the central platform. Over the back wheels is a small platform. The front and back wheels each may be folded over the central platform. A user would ride this device with one foot on the central platform. The other foot either provides the driving force for the skateboard or rests on the rear platform. The rear platform is directly behind the central platform requiring a user to position both feet along the longitudinal median of the device. This is also true of the rollerskate of U.S. Pat. No. 5,971,406. The central platform is at least as large as the rider's foot. The foot platform is in the same plane as the front and rear wheel axles.
To ride a conventional skateboard, a rider paces a front foot on the board at an angle (such as a 45 degree angle) relative to the longitudinal median axis of the board. Thus the toe area of the rider's foot is closer to one side of the board and the rider's heel is closer to the other side of the board. The second foot of the rider is used to propel the board forward. The “pumping” action of the foot provides a forward force to roll the skateboard forward. When the board coasts, the pumping foot is placed on the rear of the board, also at a angle similar to the angle of the front foot. To steer the board, toe or heel pressure is exerted to one side of the board. This angles the wheel axles on the truck, angling the wheels and turning the skateboard.
In the prior art, the foldable skateboards disclosed are all, when folded into the compact size, at least the size of the rider's foot, and in most cases are substantially larger. Most of the foldable or collapsible skateboards require an unconventional foot position. For example, U.S. Pat. No. 5,941,406 and U.S. Pat. Appln. Pub. No. 2003/0127816 A1 require a foot position in which the planted foot faces forward and the pumping foot is directly behind the planted foot when resting on the device. This is not the natural foot position when riding a conventional skateboard, and this foot position negatively impacts rider comfort and skateboard maneuver ability.
The present invention is a telescoping skateboard including a front wheel assembly and a rear wheel assembly joined by a telescoping member. The telescoping member may include a spring joining the front wheel assembly to the rear wheel assembly. Mounted at the front of the board is a toe platform and mounted at the rear of the device is a heel platform. Also mounted at the rear of the device wheel is a microboard. The microboard extends to the side of the skateboard.
A rider may position one foot on the toe platform and heel platform, and rest the second foot on the microboard to coast when the second foot is not being used to move the board forward. The toe platform may be angled such that the rider's toe does not point straight forward. The heel platform may be raised in respect to the toe platform. A toe and heel strap may be included to secure one foot of a rider to the board. The other foot may be used to push the device.
Embodiments of the present device enhance the compacting features of the devices. The front wheel assembly may be a single wheel mounted on a retractable strut. The microboard may pivot into a folded position over the toe platform and heel platform. When the microboard and front wheel are folded into the compact position and the telescoping is also frame retracted, the compact skateboard has a top area not much larger than a CD jewel case.
Aspects of the present invention are illustrated in the following examples. With reference to
With reference to
At the rear of the device mounted over rear wheel 24 is a base board 44. Mounted onto base board 44 is heel platform 30. A bolt 36 extending through groove 34 allows variable positioning of the heel platform 30. A microboard 40 is attached by bolt 42 base board 44. If a user wishes to switch a device from a left to right foot the toe positioning of toe platform 20 may be reversed by angling the toe platform towards the opposite side of the skateboard. The location of heel position determined by heel platform 30 could also be repositioned to be aligned with toe platform 20. The attachment of microboard 40 by bolt 42 allows microboard 40 to be repositioned such that it extends from the opposite side of the skateboard. This effectively allows the device to be worn on either the left or right foot. Strap 26 on toe platform 20 may be fastened across the user's toe and strap 32 behind the heel and across the top of a shoe such that length 32b of strap 32 extends behind the heel and length 32a of strap 32 extends across the top of a user's shoe.
The specific assembly of one example of the device is shown in
The telescoping aspect of the skateboard is achieved by guides 62a, 62b which slide in tracks 64a, 64b. Guide 62a, 62b are affixed by bolts 85, 84 respectively which are secured through a hole in tracks 64a, 64b and secured by nuts 86, 87. When nuts 86, 87 are secured onto bolts 85, 84 the guides 62a, 62b may slide along the length of groove 33a, 33b.
In a similar manner, tracks 64a, 64b may slide relative to brackets 100, 102. Track 64a is attached to bracket 100 by bolt 95 which extends through track 31a and is secured on the other side by nut 96. Similarly, track 64b is attached by nut 94 which extends through groove 31b and is secured by nut 97. In this way tracks 64a, 64b may slide freely on the bolts 95, 94 respectively.
Springs 60a, 60b are attached at a first end to either brackets 53a, 53b or to a front end of rails 62a, 62b. Springs 60a, 60b are attached at a first end spring and to brackets 100, 102 respectively and at a second spring end to a front portion of guides 62a, 62b. This attachment of the springs provides a force retracting the guides 62a, 62b towards the back of the telescoping skateboard. This attachment allows the guides 62a, 62b to retract in the tracks 64a, 64b. The tracks 64a, 64b retract against the sides of the brackets 100, 102. In this way the device becomes much more compact. The guides, tracks, and brackets form a telescoping member (or telescoping frame) onto which the platforms for a rider's toe end heel and the microboard are mounted.
Brackets 100, 102 are affixed to truck 70 by bolts 80, 81, 82, 83 which extend through the truck and are respectively secured by nuts 90, 91, 92, and 93. Wheels 24 are mounted on truck 70. A resilient ring 71 allows the axle mounted on truck 70 to pivot allowing the skateboard to turn.
Mounted over guides 62a, 62b is toe platform 20 secured by bolts extending through groove 64. The toe strap 26 is attached to one side of the toe platform. The attachment of toe platform 20 by bolts extending through groove 54 allows the toe platform 20 to be angled to the side of the portable skateboard. This angling allows more natural foot position. This angling also allows the portable skateboard to be used with either of the rider's feet. If a rider decides to switch feet the toe platform can be angled to the opposite side of the portable skateboard. The heel platform 30 is affixed to brackets 100, 102 by bolts extending through groove 34. Heel strap 32 is joined to the sides of heel platform 30.
Microboard 40 extends from the side of bracket 100 affixed by a bolt extending through microboard 40. Both heel platform 30 and microboard 40 may be moved to allow user to use the device on either foot. Heel platform may be positioned by sliding the platform along groove 34 such that when the rider's toe is angled on the toe platform the heel may comfortably rest on the heel platform. The microboard 40 should be positioned such that it extends from the side of the telescoping skateboard of the foot that is not affixed on the toe and heel platform. The angle of the top platform will be the same side of the skateboard.
The fully compacted telescoping skateboard is shown in
The rear skateboard truck and wheel assembly provides maneuvering capabilities which should be similar to the maneuvering of a conventional skateboard. The use of a single front inline wheel eliminates the bulk of using both front and rear truck and wheel assemblies. This front wheel is disposed on struts which fold back and neatly fit within the telescoping frame. However, as an alternative dual front wheels could be used if desired. The wheels may be commercially available polyurethane wheels with internal bearings as used in skateboards or in-line rollerskates.
Attaching one foot to the board eliminates the need for a expansive deck to allow proper foot position. The attachment of foot also compensates for maneuverability lost through the single wheel/truck assembly. As noted throughout, the skateboard can be attached to either foot by pivoting the toe platform to the opposite side of the skateboard, sliding the heel platform to the new heel position and the pivoting microboard to the opposite side of the skateboard. The angled position of the foot allows a similar heel-toe pressure to turn the wheels mounted on the truck. This should provide a maneuverability similar to that of conventional skateboard.
Unlike conventional rollerskates (such as in-line rollerskates) only a single telescoping skateboard is required. A rollerskate in contrast requires a skate for each foot. The height of the telescoping skateboard is similar to the height of a conventional skateboard. This contrasts with roller, which require a bulky boot which is more difficult to transport in a backpack or store in a school locker.
The present invention also has advantages over conventional skateboards. It is much more portable and may be easily stored. There is low risk of bringing this small, compact device into theater or a convenience store. The unique features of the telescoping skateboard allow foot position similar to that of a conventional skateboard. Because one foot may be affixed to the board, the ability to maneuver the telescoping skateboard of the present invention is enhanced. The front line in-line wheel eliminates the bulk associated with a front skateboard truck assembly. The telescoping frame of the present skateboard reduces the bulk of the device and has greater ability to retract a small size than even other retractable foldable skateboards. The telescoping feature also allows the frame to automatically adjust to different shoe sizes of different riders. If springs are used, the rider merely may fold the microboard into position, strap the device onto the rider's planted foot and begin to ride the skateboard.
The foot position allowed by the present invention is the natural foot positioning of a foot on a skateboard. The one alteration compared to the conventional skateboard is the heel position is slightly raised. In the illustrative embodiment the toe is positioned on the toe platform just above the axle level of the front wheel while the heel is raised above the top of the rear wheel. This positioning increases the front/back stability and prevents the weight of the rider from shifting too far to the rear. The positioning of the toe angled to the side decreases the strain on the shin. This also allows the rider to turn the telescoping skateboard as the rider would a conventional skateboard, i.e. shifting weight between the toe and heel portion. Such a device would be much more comfortable to ride compared to a in-line skate having a rear platform requiring both feet to be longitudinally oriented along the longitudinal median line of the rollerskate device.
The toe platform, heel platform, and microboard include grip tape decals or both as is typical on conventional skateboards. They may be made of wood (e.g. plywood) or fiberglass like a conventional skateboard. The illustrated telescoping device using a guide and track system is one telescoping embodiment. It is also possible to use telescoping concentric pipe segments with flared ends. The spring of the present invention provides an advantageous means for retracting the device to the retracted form. However, if no spring is used the telescoping device can merely slide to a position and be affixed in that position by either tightening the nut and bolt combinations such that fictional sliding no longer occurs or through the use of a locking latch.
