Powered unicycle device

Abstract

A self-balancing powered unicycle device (100) having a single hubless wheel is disclosed. The self-balancing powered unicycle device comprises: a single wheel (120); a motor adapted to drive the wheel; a balance control system adapted to maintain fore-aft balance of the unicycle device; at least one foot platform (165) for supporting a user of the unicycle device; and a casing (110) adapted to cover at least a portion of the outer rim of the wheel. The self-balancing powered unicycle device further comprises at least one energy storage device compartment (150A, 150B) protruding outward from a side of the casing (110) and adapted to house an energy storage device for powering the unicycle device.

Claims

1. A self-balancing powered unicycle device, comprising: a single wheel; a motor adapted to drive the single wheel; a balance control system adapted to maintain fore-aft balance of the powered unicycle device; at least one foot platform for supporting a user of the powered unicycle device; a casing adapted to cover at least a portion of an outer rim of the single wheel; and at least one energy storage device compartment protruding outward from a side of the casing and adapted to house an energy storage device for powering the powered unicycle device; wherein the at least one energy storage device compartment is adapted to be removable from the casing so as to enable removal of the energy storage device from the powered unicycle device; and wherein, for each energy storage device compartment of the at least one energy storage device compartment, the energy storage device compartment has a width, and is shaped such that the width of the energy storage device compartment at an end closest to a rotational axis of the single wheel is less than a width of the energy storage device compartment at an end farthest from the rotational axis of the single wheel.

2. The powered unicycle device of claim 1, wherein the at least one energy storage device compartment is substantially V-shaped.

3. The powered unicycle device of claim 1, wherein the at least one energy storage device compartment has a trapezoidal or kite shape.

4. The powered unicycle device of claim 1, wherein an outwardly facing surface of the least one energy storage device compartment comprises a yielding material.

5. The powered unicycle device of claim 1, wherein said single wheel is hubless, and wherein the powered unicycle device further comprises at least one drive wheel driven by said motor and in contact with an inner rim of the single wheel.

6. The powered unicycle device of claim 1, wherein the energy storage device comprises at least one of: an electrical battery; an electrochemical battery; a mechanical energy storage device; or a capacitor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) An example of the invention will now be described with reference to the accompanying diagrams, in which:

(2) FIG. 1 is an isometric view of an embodiment of a powered unicycle device;

(3) FIG. 2 is an exploded diagram of the powered unicycle device of FIG. 1,

(4) FIGS. 3A & 3B are side and front elevations, respectively, of the embodiment of FIG. 1;

(5) FIG. 4 is an isometric view of an alternative embodiment, wherein the battery compartments are detached from the powered unicycle device; and

(6) FIG. 5 is an exploded diagram of components internal to the powered unicycle device of FIG. 1.

DETAILED DESCRIPTION

(7) FIGS. 1-3 show one embodiment of a powered unicycle device 100. FIG. 1 shows the powered unicycle device 100 with a casing 110 which covers a significant portion (e.g. more than half) of the wheel 120. Here, the casing 110 is formed from a first, left portion 110A that covers a significant portion of the left half of the wheel 120, and a second, right portion 110B that covers the a significant portion of the right half of the wheel 120. FIG. 2 illustrates internal components of the unicycle device 100, namely a wheel 120 (which spins about a central axis 125) and drive arrangement 135.

(8) Referring back to FIG. 1, the casing 110 is retained in a fixed position relative to the central axis 125.

(9) Referring now to FIG. 2, rotation of the single wheel 120 is driven by a drive arrangement 135 according to an embodiment. The drive arrangement 135 includes pairs of guide wheels (not visible) attached to the rim of the drive arrangement 135. A rib (not visible) is provided around the inner rim of the wheel 120 and fits into a gap between the guide wheels of each pair. The guide wheels are therefore adapted to contact with the inner rim of wheel 120 where they spin along with wheel 120 and hold wheel 120 in place by way of the rib. Of course, it will be appreciated that other arrangements, including those with only one guide wheel, are possible. For powering the drive arrangement 135, first 145A and second 145B batteries are provided in first 150A and second 150B battery compartments of the casing, respectively.

(10) When fitted to the casing 110, as depicted in FIG. 1), the battery compartments 150A, 150B protrude outwardly from the side of the casing 110 and adapted to house a battery for powering the unicycle device. Thus, the casing 110 is adapted to enable the batteries 145A,145B to be positioned outside of the rotating wheel (and thus external to the drive arrangement 135), thereby enabling the wheel to be slimmer. In other words, by catering for placement of a batteries 145A,145B outside the plane of the single wheel 120, the lateral extent of the wheel may be minimized. Also, the battery compartments 150A,150B may be adapted to provide a larger space for accommodating bigger batteries than conventional self-balancing powered unicycles. The depicted embodiment may therefore employ larger, more powerful batteries than conventional self-balancing powered unicycles whilst maintaining or reducing the width of the wheel.

(11) The first 150A and second 150B battery compartments house first 145A and second 145B batteries, respectively. The battery compartments thus protect the batteries from damage, water and/or dust.

(12) The batteries 145A,145B are adapted to power a motor (of the drive arrangement) which drives one or more drive wheels (not visible) positioned at the lowermost point along the inner rim of the wheel 120. The batteries 145A,145B are adapted to electrically connect to a metal framework 160 which is adapted to conduct electrical energy to supply power to a motor of the unicycle device 100. In this embodiment, there are two batteries in order to create a balanced distribution of volume and weight. However, it is not necessary to employ two batteries 145A,145B. Also, alternative energy storage arrangements may be used, such as capacitors, and other known power storage devices, for example.

(13) In this example, the first 150A and second 150B battery compartments are shaped such their width (when viewed from the side of the unicycle device, as in FIG. 3A) increases with distance from the rotational axis 125 of the single wheel 120. In other words, the battery compartments 150A, 150B are trapezoidal or generally V-shaped, with the narrow end pointing towards the rotational axis 125 of the single wheel 120. This shaping of the battery compartments is designed to reduce, minimize or prevent contact of a user's legs (e.g. knees and/or calves) with the casing 110 and/or protruding compartments 150A,150B during general use of the unicycle device 100.

(14) In particular, it is noted that when turning a powered unicycle device (such as an embodiment of the invention), the user will typically tilt or move their legs forwards or backwards. The sharper or greater the turn, the more the legs may tilt or move forwards or backwards. By arranging the shape of the protruding battery compartments 150A,150B be of larger width or size towards an end furthest away from the rotational axis 125 of the wheel 120, the size of the protruding battery compartment may be maximized whilst reducing, minimizing or preventing its contact with user's legs during use. In other words, the shape and lateral extent of a protruding battery compartment 105A,150B is adapted to avoid or reduce contact with a user's leg during use, yet still be of maximum size so as to house a large battery 145A,145B.

(15) When a user manoeuvres the unicycle device 100, the user may tilt or move their legs forwards or backwards ahead or behind the battery compartment, whilst the battery compartments 150A,150B are shaped so that the separation between the user's leg and a battery compartment 150A,150B is reduced towards a minimum (so as to maximize its size).

(16) The outwardly facing surface of each battery compartment 150A,150B is provided with a yielding material 155 thereon. The yielding material 155 is of this example is chosen so as to provide friction with a ground surface and thereby restrict or reduce a sliding movement of the unicycle device across the ground (if a user falls from the unicycle for example). Here, yielding material 155 comprises a rubberised or polymer-based material.

(17) The outwardly facing surface of each battery compartment 150A,150B therefore perform multiple functions, including the protection of a battery housed therein, and the provision of grip between the side of the unicycle device 100 and the ground/floor surface (to prevent the unicycle from sliding along the ground/floor in an accident for example).

(18) The wheel 120 is hubless and the drive arrangement 135 is adapted to be fitted inside the wheel. In other words, the drive arrangement is sized and shaped so that it can be positioned in the void define by the inner rim of the hubless wheel 120.

(19) Two foot platforms 165 are coupled to the axle 125 of the wheel, wherein a platform 165 is situated on either side of wheel 120. The foot platforms 165 are movable between a stowed configuration, wherein the foot platforms are substantially parallel with the plane of the wheel (as shown in FIGS. 1 & 3), and an active configuration, wherein the foot platforms are substantially perpendicular to the plane of the wheel (as shown in FIG. 2) so as to support a user's weight. Thus, in this embodiment, the foot platforms 165 are movable between: (i) a stowed configuration wherein they are flat against the side of the wheel; and (ii) an active configuration, wherein they project outwardly from the side of the wheel to provide a support surface for the feet of a user. Accordingly, the foot platforms 165 are upwardly foldable into a stowed configuration that narrows the profile of the unicycle 100 to aid in storage and carrying. In use, the foot platforms are moved to the active configuration, and the user stands with one foot on each platform 165.

(20) The foot platforms 165 are formed with removed portions (or voids) 170 for reduced weight.

(21) The drive arrangement 135 includes a gyroscope or accelerometer system (not shown) which senses forward and backward tilt of the device in relation to the ground surface and regulates the motor accordingly to keep the device upright. In this way, the user is provided a way of controlling the acceleration and deceleration of the unicycle by varying the pressure applied to various areas of the foot platforms 165. It also enables the unicycle to self-regulate its balance in the fore-and-aft plane.

(22) The casing 110 of the embodiment of FIGS. 1-3 also comprises a lifting handle 180. The lifting handle 180 is positioned at the top of the casing 110, above the wheel 120, and may be used to hold the unicycle 100 above the ground, for example to enable a user to lift, carry, convey or place the unicycle 100.

(23) Turning now for FIG. 4, there is depicted another embodiment (which is slightly modified when compared to the embodiment of FIGS. 1-3), wherein the battery compartments 150A,150B are adapted to be removable from the casing 110. In FIG. 4, the battery compartments 150A,150B are shown to be detached from the unicycle device 100, and the arrows illustrate how the battery compartments 150A,150B can be attached/detached to/from the casing 110 of the unicycle device 100. It is also noted that the battery compartments 150A,150B of this embodiment are flatter than those of FIGS. 1-3 since they do not comprise a projected section which is adapted to extend over the top the casing 110.

(24) It will be understood that removal of the battery compartments 150A,150B, enables removal of the batteries 145A,145B housed within the battery compartments 150A,150B. The depicted embodiment thus provides a battery arrangement which can be quickly and easily connected/removed to/from the unicycle device 100 for repair or replacement, for example. Also, by being adapted to be removable from the casing 110, the depicted embodiment may be dismantled to reduce the overall size or profile of the unicycle, thereby improving its portability. The embodiment of FIG. 4 may therefore be considered as being modular in nature.

(25) It is also noted that the foot platforms 165 of this embodiment are different from those of FIGS. 1-3 in that they do not comprise removed portions (or voids).

(26) While specific embodiments have been described herein for purposes of illustration, various modifications will be apparent to a person skilled in the art and may be made without departing from the scope of the invention.

(27) It will be appreciated that a variation on the hubless drive arrangement described above may be based on gear transmission instead of friction. The drive wheels may thus be replaced by circular gears for example, and accordingly the inner rim of the hubless wheel may have alternating protruding and indented segments (i.e. “teeth”). Other embodiments may not employ a hubless wheel, but may instead employ a ‘hubbed’ wheel.

(28) A retractable carrying strap may also be provided and attached to the top of the casing, for example. Such a carrying strap may be used to carry the unicycle, for example over the shoulder of user. A hook may be provided on the bottom of the case to create rucksack-like belts from the carrying strap.

(29) Further, in some embodiments, the battery compartment(s) may extend beyond the circumferential extent of the generally circular casing, thus meaning that the size of the battery compartment(s) may not be generally restricted by the circumference of the wheel or casing.

(30) FIG. 5 illustrates internal components of the powered unicycle device described with reference to FIG. 1. In particular, there is illustrated the balance control system 210 adapted to maintain fore-aft balance of the unicycle device, the wheel 120 and the drive arrangement 135.

(31) A motor 220 (of the drive arrangement) drives one or more drive wheels 230 positioned at the lowermost point along the inner rim 240 of the wheel 120.

(32) The drive arrangement 135 includes pairs of guide wheels 245A, 245B attached to the rim of the drive arrangement 135. A rib 250 is provided around the inner rim 240 of the wheel 120 and fits into a gap between the guide wheels of each pair. The guide wheels are therefore adapted to contact with the inner rim of wheel 120 where they spin along with wheel 120 and hold wheel 120 in place by way of the rib.