Abstract: An amusement device is provided that can be used as an electric yo-yo and as a mechanism for producing aesthetically pleasing string oscillations. The amusement device includes a battery operated spinning mechanism that can be selectively turned on and off by a person using the device. A flexible tether is provided having a first end and a second end. The first end of the tether is coupled to the spinning mechanism and is spun by the spinning mechanism. A display object is coupled to the second end of the flexible tether, wherein the flexible tether is the only physical interconnection between the spinning mechanism and the display object. The spinning mechanism can be used either to rotate the tether to create oscillations in the tether, or wind the tether, thereby creating a yo-yo with the display object.

Abstract: A toy washing machine has a safety function to prevent the release of water and the like. The safety function locks the door of the toy washing machine when the machine is filled with water. As water is poured into the machine, it flows to a container positioned below an internal drum cabin. The container has a float that rises as the container fills with water. The rising of the float activates a lever device that is connected to a pin. The pin locks the door and prevents the door from opening when water is within the machine. The door of the machine has a seal made of heterotypic silicon rubber that prevents leakage.

Abstract: A music box transmission mechanism for a music box includes a first rotating member having a power device and rotating in one direction, a second rotating member having a wavy track and rotating in an opposite direction to that of the first rotating member, a limiting frame fixed on the first rotating member, and a moving members limited in the limiting frame, disposed on the wavy track of the second rotating member and moving up and down upon moving with the first rotating member. Furthermore, when the first rotating member and the second rotating member engage with each other and rotate in opposite directions, a plurality of movable ornaments respectively limited in special frames fixed on the first rotation member are disposed on an asymmetric wavy track of the second rotating member and move up and down smoothly.

Abstract: An animated display comprising an outer sleeve having an inner sleeve positioned therein. The outer sleeve is itself rotatably connected to a support base. Also included in the animated display is an actuation assembly which is cooperatively engaged to the outer and inner sleeves. The actuation assembly is operative to facilitate the rotation of the outer sleeve relative to the support base concurrently with the rotation of the inner sleeve relative to the outer sleeve.

Abstract: A rhythmic motion driver having a case containing flywheels. A spring is within the case that compresses and expands in response to oscillatory motion of a bar that extends through an opening in the case. The spring compression and expansion is slowed but not dampened by the movement of the flywheels.

Abstract: An amusement device having an endless flexible strand forming a loop and an inline traction drive unit that drives a portion of the strand to impart inline linear velocity to the strand to create an elongated loop extending from the drive unit. The amusement device includes a housing with a handle and a rotatable cup with an ejection aperture for changing the direction of the driven loop.

Abstract: A foldable hula hoop structure includes multiple arcuate connecting members combined with each other. Each of the arcuate connecting members includes two opposite flexible main bodies combined with each other. Each of the two opposite main bodies has a first end and a second end respectively provided with convex portions and mating concave portions, so that any two adjacent arcuate connecting members may be combined with each other by engagement of the convex portions with the mating concave portions. Each of the convex portions and the mating concave portions is formed with a through hole for passage of a first locking member which is locked with a second locking member, so that any two adjacent arcuate connecting members may be combined with each other by the first locking member and the second locking member.

Abstract: A method for assisting a child to overcome a fear with a plaything, comprising the steps of providing a dispensing component, fixing in a tangible medium a story written for helping a child to confront and overcome a fear, providing access to the story in combination with the dispensing component, and directing an end user to read the story and to dispense using the dispensing component at select intervals during such reading.

Abstract: A method of exercising and various exercise devices. The exercise device includes a substantially circular hoop, the hoop comprising a hollow chamber for allowing a member to move within the chamber. One of at least one handle or at least one mechanism is attached to the hoop for supporting the hoop at a location on a user's body. At least one member is disposed in the hollow chamber, wherein the hoop is postionable around a portion of the user's body. The exercise device can also include at least one substantially circular casing comprising a hollow chamber for allowing a member to move within the chamber and a centrally disposed through opening. A handle rod at least partially disposed within the opening, and at least one member is moveably disposed in the hollow chamber. The casing is removably fixed to the handle rod so that movement of the handle rod causes movement of the at least one member within the casing.

Abstract: A musical hoop toy may be provided with a hoop structure, a sensing mechanism coupled to the hoop structure and being disposed on an interior side of the hoop structure such that, when the hoop structure is spun around a person's waist, the sensing mechanism will be periodically activated by a portion of the person's waist, an audio speaker coupled to the hoop structure, and a controller operatively coupled to the sensing mechanism and the audio speaker. The controller may include a processor, a memory, and a computer program stored in the memory. The computer program may have a computer program portion that causes a music sequence to be generated and a computer program portion that causes an audio sound effect to be generated in response to each activation of the sensing mechanism.

Abstract: Molded plastic yo-yo halves are connectible to each other by an axial having threaded ends that are adapted to threadably engage threaded inserts press fitted into a specially designed socket. The inserts are polygonal as are the sockets with the insertion end of the socket being provided with a shallow registration socket adapted to orient the threaded insert with respect to the socket. The yo-yo halves are molded separately and the inserts are press fitted into the sockets into a subsequent operation, resulting in manufacturing efficiencies as well as a strong properly aligned yo-yo construction.

Abstract: An exercise and/or play hoop, made of semi-rigid plastic tubing, is partially filed with water (30) to between ⅙ and ½ full, most preferably ¼ full. The water improves the dynamics of the hoop and makes it easier to keep the hoop elevated by gyration. The hoop is made of a length of hoop tube (10) bent into a circle. A coupling tube (20) is inserted where the ends (11, 12) abut, spanning the joint. The coupling tube includes a bore (25) through which the liquid flows circumferentially around inside the hoop, and past the joint. The joint is sealed on the outside with a shrink-plastic tube. A decorative, preferably iridescent cover (18) may cover the hoop.

Abstract: An exercise and/or play hoop, made of semi-rigid plastic tubing, is partially filled with water (30) to between ⅙ and ½ full, most preferably ¼ full. The water improves the dynamics of the hoop and makes keeping the hoop elevated by gyration easier. The hoop is preferably made of a length of hoop tube (10) bent into a circle. A coupling tube (20) is inserted where the ends (11, 12) abut, spanning over the joint. The coupling tube includes a bore (25) through which the liquid flows circumferentially around inside the hoop, and past the joint. To seal the water in O-rings (41, 42) are used. A decorative, preferably iridescent cover (18) may cover the hoop. Tape (50) keeps the joint together. The hoop may be scented.

Abstract: A hu-la ring includes two looped wires and a distance is defined between the two wires. A plurality of rotary members are connected between the two wires and each rotary member has an axle about which the rotary member is rotated. Two engaging ports are connected on two ends of the axle and each of the engaging ports has a recess for respectively engaging with the two wires.

Abstract: The invention discloses colorful wind indicator toys and kites having an improved disk structure for securing various rotatable wind collecting parts of the wind indicators and kites.. More specifically, it is proposed that a hub lock be used instead of a disk type structure to secure the vanes of the wind indicator toys, therein “locking” the projections of the vanes into the hub lock, preventing the vanes or similar structures from disengaging and flying away from the structure during high winds..

Abstract: A multistage hula-hoop having a plurality of hoops connected with a certain distance between a upper and lower hoops so that a user may effectively use the hula-hoop without large phase change of the hoops includes at least two hoops (10) disposed with being vertically spaced apart each other with a predetermined distance, and connecting means connecting the hoops each other not to deviate from a certain phase. This connecting means may be either at least one connecting line (20) or at least one pair of magnets (52).

Abstract: The present invention describes a portable simulation game apparatus that permits a user operating the game apparatus to move or control a three dimensional object. The movement or current position of the three dimensional object is sensed by a plurality of sensors and transmitted to a circuit board or a control means. The control means may then relate the movement or position of the three dimensional object to pre-programmed images displayed in front of the three dimensional object, on a display means. Typically, the pre-programmed images being displayed represent a race or a track for which the three dimensional object, being a vehicle, may interact therewith. To move the three dimensional object, the user tilts or moves the game apparatus in a specific direction the user wants the object to move.

Abstract: The present invention is a toy hoop for use by a person. In one embodiment of the present invention, the toy hoop comprises a hoop member having first and second end portions and a first channel adapted to receive flow of a first medium such as water. The toy hoop further comprises an interconnect member having first and second end portions adapted to connect the first and second end portions of the hoop member. The interconnect member comprises a first channel in communication with the first channel of the hoop member to allow the first medium to flow there thru. Each of the first and second end portions have an outside surface and an inside surface. The inside surfaces are downwardly tapered to provide laminar flow of the first medium thru the first channel of the hoop member. The toy hoop further comprises a first inlet port in communication with the first channel to allow the person to adjust the volume of the first medium and therefore the mass of the hoop member and the centrifugal force.

Abstract: A spinning top including a hollow body having a vertical spin axis and including an upper and a lower body portion rigidly connected together directly or preferably interconnected by a weighted annular ring for increased rotational inertia. A replaceable pointed tip is connected to the lower end of the lower body portion for free rotation only with respect to the body, the pointed tip engaging against a support surface when the body is in spinning motion. A second bearing-mounted pointed tip may be releasably connected concentric with the spin axis and upwardly extending from an upper end of the upper body portion whereby the spinning top may be lifted from one support surface and placed onto another support surface without interrupting spinning motion of the top.

Abstract: An exercising device for simulating hula-hoop rotations includes: a housing having at least a track annularly formed in the housing, at least a ball rolling or rotably moving in the track upon a hula-hoop rotation by a user who wears the housing of the exercising device, and an audio and visual device provided on the housing to indicate or display the whirling movements audiovisually.

Abstract: A hula hoop is disclosed. In this hula hoop, the tubular hoop body 10 has an annular, polygonal or floral profile and contains a fluid filler 20, such as a liquid- or solid-phase fluid filler, within its cavity 30 while leaving an empty space in the cavity 30, thus being improved in its functional effect when used for physical exercise or in play due to a dynamic movement of the filler 20 within the cavity 30 during a rotating action of the hoop body about the body of a user. In the hula hoop of this invention, the fluid filler 20 is selected from water, brine, metal balls having a predetermined diameter, infrared radiation particles, and particular magnets. In addition, the fluid filler may consist of solid particles and liquid. In an embodiment, the hoop body 10 is fabricated using a plurality of modules, designed to be assembled and disassembled.

Abstract: A battery operated gyroscopic entertainment device is powered from a mating cradle, or from a battery supply within the device. The device includes an egg-shaped housing in which is disposed a high speed DC motor whose motor shaft preferably extends from each end of the motor. A hub member is attached to each shaft end, and a weighted belt is attached to each hub member. A central portion of the motor housing is fixedly attached to the device housing such that upon application of operating potential to the motor, the motor shaft, and the weighted hub members rotate at high speed, which imparts a gyroscopic action to the device. A cradle may be provided containing a power source, with power connections that mate to the device housing when the housing is placed within the cradle.

Abstract: A hand-held toy that lights when spun, and which includes a rod, a head attached to, and spins with, the rod, a light source illuminates with movement of, the head, and apparatus associated with the light source, and which is grasped by the hands of a user. The head is either spherically-shaped or a pair of stacked disks. The light source includes a plurality of bulbs that are disposed on the head, a pair of battery interfaces that are in electrical communication with the plurality of bulbs and hold, and electrically communicate with, a pair of batteries, and a centrifugal switch that is electrical communication with the plurality of bulbs, and which closes when the head is spun, and when closed, illuminates the plurality of bulbs so as to allow the plurality of bulbs to illuminate when the head is spun.

Abstract: A noise activated mobile for soothing an infant by turning the mobile on when the infant makes a relatively loud noise. The noise activated mobile includes a housing having a lumen therein. An arm portion is elongate and has a first end and second end. The first end is securely attached to the housing. The arm extends upwardly away from the housing and is arced. A casing is integrally coupled to the second end of the arm portion. The bottom side of the casing has a hole therethrough. A motor is mounted in the casing. A rod is securely attached to the motor and extends through the hole in the casing. The motor is adapted to rotate the rod. A mobile is coupled to a free end of the rod. Control circuitry is fixedly mounted in the housing. The control circuitry is adapted for tracking elapsing time, actuating the motor and sensing relatively loud sounds. The control circuitry is operationally coupled to the motor.

Abstract: A tethered top is provided with a construction by which it can be accelerated, controlled and/or manipulated using a tether that remains attached to one end of the top, top body, or spindle. The tether can optionally be used as a pull string to be wrapped around top or spindle to impart acceleration to the top. The tether remains attached to at least one end of the top via at least one low friction housing connector but does not substantially retard the top's rotation, either when spinning on a surface or as supported in the air by the attached tether, low friction housing connector, and/or spindle.

Abstract: A toy consists of a base, a cap and a toy model. The base has stationary wheels and a movable wheel located on the bottom section thereof. The movable wheel may be driven through a gear set by battery power for moving the base around. The cap has a hollow casing located on the top section to house a motor that is driven by a battery for rotating the cap through another gear set. The base has an arched gear rack located on the top surface. By way of an elastic element and a lever to couple with the gear sets and arched gear rack, the cap may be moved to the left and right, and rotated positively and reversely to generate a wide variety of simulative motions.

Abstract: A pinwheel assembly has a main shaft, a plurality of curved rods, a first rotating wheel, a second rotating wheel, a third rotating wheel, a fourth rotating wheel, and a plurality of fabric vanes. The main shaft passes through the first rotating wheel, the second rotating wheel, the third rotating wheel, and the fourth rotating wheel. Each of the curved rods is connected to the first rotating wheel and the fourth rotating wheel. Each of the fabric vanes is connected to the second rotating wheel and the third rotating wheel.

Abstract: A motion toy transmission mechanism includes a bottom plate, a clockwork-driven musical box fixedly mounted on the bottom plate, the clockwork-driven musical box having a clockwork shaft and a handle fixedly fastened to the clockwork shaft and spaced below the bottom plate for turning by hand to fasten up the clockwork of the musical box, a drive gear fixedly mounted on the output shaft of the musical box, a driven gear mounted on the bottom plate and meshed with the drive gear; a rotary disk supported on the bottom plate and rotated by the driven gear upon releasing of the clockwork of the musical box, the rotary disk having an internal gear meshed with the driven gear, and a pressure member mounted on the bottom plate and spaced around the musical box to guide rotary motion of the rotary disk.

Abstract: A variably-weighted exercise hoop includes a plurality of large hollow balls, a plurality of plugs corresponding to and received in the balls, and a cable extending through and securing together the combined balls and plugs. A fixed quantity of pellets is enclosed in each combined ball and plug, and that quantity is varied by the manufacturer to achieve hoops of different weights using only one mold, whereby users of different abilities can have suitable hoops. The pellets provide both audible and physical rhythms for a user as the hoop rotates.

Abstract: An apparatus for supporting a flag on a chain. The apparatus includes a pair of cylindrical members coupled by hook and loop fasteners to an edge of a flag. A flexible chain interconnects both members and terminates at one end with a ring. A user may grab the ring and swing the flag so as to display it.

Abstract: A toy top system that uses uniquely configured tops. The system contains a plurality of toy tops that can be stacked on top of one another while spinning. Each of the tops has a value for rotational inertia associated with it. At least some of the tops are configured to have a value for rotational inertia that varies as a function of the rotational speed of the top. The tops with a variable rotational inertia are capable of storing and providing rotational energy while maintaining a near constant rate of rotation.

Abstract: An enhanced structure of an animated ornament composed of a globular shell, a hollow ball, a piece of non-magnetic, high-density material (such as copper, tin, plastic etc.), an inner magnet and an outer magnet. The hollow ball, having decorative figures, is smaller than the globular shell and is included in the globular shell. The space in between the globular shell and the hollow ball is filled up with liquid so that the hollow ball floats in the liquid and, when being shaken, turns around in all directions. Inside the lower part of the hollow ball attached a piece of non-magnetic, high-density material, such as plastic, copper and tin, and an inner magnet is fixed on the top of the non-magnetic material.

Abstract: A rotating musical remote control baby mobile device. The baby mobile device has a base attached to a crib or piece of furniture. The device also includes a music box, an extending arm and rotatable bear attached to the arm. The mobile has several animal figures that can be removed from the mobile using snap hooks or hook and loop fasteners. These individual animal figures can be safely given to an infant or newborn for holding or teething. The baby mobile device can also be controlled by an infrared remote control that can be attached to a piece of furniture or conveniently hung by a foldable handle on a door knob.

Abstract: The pyrotechnic entertainment product has an upright spindle that may be pushed into the ground for support until a coil in the spindle engages the top surface of the ground. The image of an upright dancing bull or other creature is secured to the spindle intermediate its opposite ends and is poised as if he were performing the steps of a Mexican hat dance. A pyrotechnic pinwheel resembling a sombrero is rotatably carried on the upper end of the spindle slightly above the head of the bull. When the pinwheel is ignited, it propels itself about the spindle like a spinning sombrero while emitting a colorful plume of sparks reminiscent of the energy, color, and excitement of the traditional Mexican hat dance.

Abstract: A hula hoop having a plurality of arc frames joined in end-to-end relationship so as to form a circular configuration. Each of the arc frames has a top arc unit and a bottom arc unit mechanically affixed together. Each of the arc frames has an undulating inner surface. A spherical ball is rotatably mounted within the arc frame so as to have a surface extending outwardly of the inner surface.

Abstract: A toy includes a first enclosed portion having a first bore and a second enclosed portion having a second bore. The first enclosed portion provides a gas pressure from the first bore to enter the second enclosed portion via the second bore. The toy also has a rotating member rotatable situated in the second enclosed portion and a plurality of fins. In addition, the toy includes a pointer element situated in the second enclosed portion which is coupled to a center portion of the rotating member. Thus, when the gas pressure entering from the second bore is applied to at least one of the plurality of fins, the rotating element rotates the pointer element.

Abstract: A hula hoop, comprising of a plurality of arcuate modules individually having bulged portions with a connection plug and a connection socket being formed at opposite ends of each module, is disclosed. An annular groove is formed at the tip of each bulged portion, with a raised disc-shaped flat base having a continuous tang along its circular top edge and being defined by the annular groove. A recessed locking groove is formed along the root of the base. A pressure projection and a guide projection are interiorly formed on the socket. An engaging slot is formed on the plug at a position diametrically opposite to the guide groove. An engaging projection is formed on the socket at a position corresponding to the engaging slot. A pressure dome, individually having a fitting ring, is attached to each bulged portion of the module. The lower edge of the pressure dome is seated in the annular groove with the fitting ring engaging with the tang of the base.

Abstract: A hand held toy having a power source with a rotating shaft. A crank is connected with an end of the shaft and extends radially therefrom. An elongated flexible member is connected with the crank at a location radially spaced from its axis. An anchor member is connected with an opposite end of the elongated member and is adapted to control that end of the member. In use, rotation of the shaft causes the elongate member to form controlled substantially uniform convolutions and, selective relative movement between the power source and anchor causes the convolutions to form into varying controlled sizes and shapes.

Abstract: An amusement device used to move a supported display object through an erratic path. The amusement device includes a base element in which is disposed a vibration mechanism. A support spring is used to interconnect a display object to the vibration mechanism in the base element. The support spring has a first end and a second end. The first end of the support spring is coupled to the vibration mechanism in the base element. The remainder of the support spring extends freely from the base element. The display object is coupled to the second end of the support spring. As the display object vibrates, it causes the support spring to oscillate, thereby causing the display object to move erratically from point to point.

Abstract: An amusement device used to move a supported display object through an erratic path. The amusement device includes a base element in which is disposed a rotating assembly. A support spring is used to interconnect a display object to the rotating assembly in the base element. The support spring has a first end and a second end. The first end of the support spring is coupled to the rotating assembly within the base element, wherein the support spring is rotated by the rotating assembly. The remainder of the support spring extends freely from the base element. The display object is coupled to the second end of the support spring. As the display object rotates, it causes the support spring to oscillate, thereby causing the display object to move erratically from point to point.

Abstract: A flying toy of the boomerang type utilizing circular airfoils in the form of disks comprising a main disk (10) with a plurality of control disks (12) or (36) affixed to its perimeter at their perimeters, sufficient to provide rigidity and lying in a generally common plane forming a homogeneous one-piece unit. When thrown overhand so as to rotate through the air the combination of disks creates lift throughout 360° of boomerang's rotation. The result is a safer, more balanced and stable boomerang that is easy to throw and catch. The specific arrangement of disks provides a profile suggestive of and suitable for application of a variety of cartoon faces such as mice, dogs or bears making a desibable wall hanging when not in use.

Abstract: A hula ring includes a ring-shaped body and a plurality of recesses defined in an inside of the ring-shaped body. Each recess receives a roller therein which rolls on a user's body when the hula ring contacts the user's body.

Abstract: An amusement device used to move a supported display object through an erratic path. The amusement device includes a base element in which is disposed a rotating assembly. The rotating assembly can be battery powered, spring powered or manually powered. A support spring is used to interconnect a display object to the rotating assembly in the base element. The support spring has a first end and a second end. The first end of the support spring is coupled to the rotating assembly within the base element, wherein the support spring is rotated by the rotating assembly. The remainder of the support spring extends freely from the base element. The display object is coupled to the second end of the support spring. As the display object rotates, it causes the support spring to at least partially elongate, thereby causing the display object to move erratically from point to point.

Abstract: A candy holding device that is designed to combine candy and which supports the candy. The device includes an upper housing, a middle housing, and a lower housing. The upper housing is a liquid-filled container that has a metallic rotor in the lower portion. The rotor is put in motion by a motor and a magnetic rotor causing a tornado movement within the liquid to provide entertainment. The liquid may also containing objects (glitter, three-dimensional figures, etc.) that are visible to the user. Additionally, at the top of the upper housing is a support for a piece of candy which can be made to be replaceable is desired. The middle housing contains the motor and a switch means. The motor spins the magnetic rotor that in turn spins the metallic rotor in the upper housing. The switch means controls the motor and the lower housing contains the power source.

Abstract: A wind responsive sign or placard for displaying advertising or other visual indicia includes a rotatable member that is attached to a stationary mounting member by a rod extending between the two members. Both the rotatable or spinning member and the stationary mounting member are formed of fluted or corrugated panels, and the axle rod extends into aligned flutes or channels in the two principal components. These panels are fabricated from extruded plastic panels of the type suitable for exterior use. The panel forming the mounting member is folded to form a three dimensional structure that is more rigid than the flat rotatable panel. The sign formed in this manner is relatively light in weight and can be assembled on site and can be mounted to a pole or post in an elevated position.

Abstract: Disclosed herein is a device for presenting alternative facial expressions, comprising: a first portion having a plurality of regions thereon. Each region includes indicia representative of an upper section of a face including a pair of eyebrows and each representation in a given region bears a unique representation from the representations of the other regions of the first portion. A second portion has a plurality of regions thereon, each region having indicia thereon representative of a middle section of face and including a pair of eyes; each representation in a given region bearing a unique representation from the representations of the other regions of the second portion. A third portion has a plurality of regions thereon, each region having indicia thereon representative of a lower section of the face and including a mouth; each representation in a given region bearing a unique representation from the representations of the other regions of the third portion.

Abstract: A modular apparatus is provided for imparting movement and selected sound to an ornament. The apparatus includes an electronic and melody module, a mechanic transmission and power module, a base module, a power supply module, a visual module, and a melody tune integrated circuit (IC) module. The apparatus also includes a motor safety device which protects the motor from overheating and burning out when the movement of the apparatus is prohibited. The electronic and melody module includes a sound generator, a printed circuit board (PCB) assembly for controlling the output of the apparatus, and a slot receptacle for the melody tune IC card module. The mechanic transmission and power module includes a motor, a motor drive shaft, a transmission gear set connected to the motor drive shaft, and at least one axial action rod connected to the transmission gear set. The detachably connected modules provide versatility to the configuration of the apparatus.

Abstract: The present invention provides an amusement device wherein generally elongated, preferably stretchable member connects a ring at one end and a base a the other end. The ring is adapted to fit around an ankle region of a person, and the amusement device is adapted to be twirled about the ankle region, wherein the elongated member varies in length in accordance with the rate at which the device is twirled. The base is adapted to travel along the surface on which the device is being used, and carries a marker adapted to contact the surface, marking the surface as the base travels.

Abstract: The flying toy apparatus has improved launch and flight characteristics, is compatible either as a flying hoop-type structure or a disc-type structure, and can be readily disassembled for compact storage. The flying toy apparatus comprises an outer section and a central floatation member. The outer section includes an annular ring made of a solid material encased within a cushion-type material. The solid material enables firm grasping of the outer annular section during launch. The cushion-type material encases the annular ring and lessens any force imposed by the annular ring upon impact. By substituting one outer ring structure with a slightly different outer ring structure, the flying toy apparatus can be readily adapted for any variety of flight patterns.

Abstract: A combination toy hoop, which includes a plurality of spherical members, and a plurality of flexible coupling rods respectively connected between each two of the spherical members, the spherical members each are formed of two hemispherical shells fastened together by a plug joint or screw means, the hemispherical shells of each of the spherical members each having two keyway-like coupling notches, the coupling rods each having two round heads at two opposite ends respectively engaged into the keyway-like coupling notches at the hemispherical shells of the spherical member.