Technical Field The present invention relates to an appliance using rotary inertia, and in particularly, to a rotary inertial appliance, in which the rotating force of a rotary inertial body, the resilience force of a spring, and the physical strength of a user may be harmonized through a reversible action that straight of a shaft and rotating movement of the rotary inertial body are periodically transformed, so that an upper body of the user may be uniformly developed and an interest in sports may be induced to keep up the exercise.

Background Art Although the moderns take abundant nutrition through the raise of the standard of living, they do not exercise regularly and continuously in a busy life.

Accordingly, since quantity of motion is insufficient relative to caloric intake, they suffer from various kinds of diseases due to the corpulence and exercise insufficiency.

In order to maintain a healthy body and a well-proportioned figure, it is necessary to make special time for exercise, but most of them are in a course of too busy life. Accordingly, it is difficult to make constant time for exercise.

Therefore, there is a need of a training tool capable of taking exercise at any time by use of a spare time.

Although physical training tools are provided for taking moderate exercise in home, there is a drawback in that since the user feels readily repugnance for the training tools, the user does not take exercise continuously. In particular, women requiring soft exercise do not completely use these training tools.

The training tools such as conventional physical training tool hardening physical muscle utilize only a load implied by the resilience force of a spring.

Since the more strong strength is required relative to the increased strain of the spring, the intensity of the exercise may be varied at an instant. The shock generated by the resilience of the spring is applied to the muscle at a moment, thereby overstraining it. Monotonous function of the tools causes the user to be tired of the tools.

In addition, since the conventional training tool is adapted to harden a special portion of the body, a body of the user does not uniformly developed Disclosure of the Invention Therefore, an object of the present invention is to solve the problems involved in the prior art, and to provide a rotary inertial appliance, in which mutual buffering effect is achieved between the rotating force of a rotary inertial body and the resilience force of a resilience member to provide a smooth training effect, and which the rotating movement of the rotary inertial body and the straight movement of handles and shafts are reversibly changed to provide teachings of the inertia.

In order to accomplish the above mentioned objects, the present invention provides a rotary inertial appliance comprising : a shaft member including a main shaft with a rotary inertial body installed, and a pair of side shafts each installed both ends of the main shaft in a manner that its length is retracted or stretched ; the rotary inertial body having a desired mass, installed to the main shaft, and continuously rotated in one direction or periodically reversed direction, the inertial body including an effect member for outputting a luminescent signal or sound signal to an exterior ; handles each formed integrally with both ends of the side shaft; a resilience member installed in an inside of the shaft member or around the main shaft, and including a compression spring to apply a resilience force outwardly to

the side shafts; and rotating means for rotating the rotary inertial body in one direction or periodically reversed direction.

The rotating means for rotating the rotary inertial body includes a wire having a desired length and symmetrically positioned between an outer circumference of the rotary inertial body and both handles, and a damping spring positioned between an end of the wire and the rotary inertial body for damping shock generated from reverse rotation of the rotary inertial body and for generating a reverse rotation force.

As an alternative, the rotary inertial body is installed in the main shaft by a latch gear and a bearing which are rotated in one direction, the main shaft is formed symmetrically with at least double spiral grooves provided on one side or double sides thereof, and the side shaft has on an inner circumference thereof a ratchet inserted into the spiral grooves of the main shaft to convert a straight movement into a rotating movement for generating a rotating force.

As another alternative, the resilience member installed to an outside of the main shaft includes a conical spring having a large diameter end contacted to the rotary inertial body, and a small diameter end opposed to the large diameter end, and a thrust bearing is located between the conical spring and the side shaft to achieve smooth operation therebetween.

The effect member provided in the rotary inertial body includes a generating unit having a permanent magnet fixed to the main shaft and a coil movable together with the rotary inertial body relative to the permanent magnet for generating an electromotive force, and a display having a plurality of light emitting diodes for generating the luminance signal by a power supplied in accordance with rotation of the rotary inertial body. The effect member also includes a switch regulating a luminance color of the light emitting diode in accordance with the rotating direction of the rotary inertial body or the variation of the rotating speed, and having a weight

and a switching terminal, which are connected by a resilient piece to be operated by inertia.

The rotary inertial body includes an eccentric weight having a regulating and guiding groove and a fixing screw provided in one side of the rotary inertial body 300 for positioning and fixing the rotary inertial body, thereby causing vibration in the handles when rotating.

Brief Description of the Drawings The above objects, other features and advantages of the present invention will become more apparent by describing the preferred embodiment thereof with reference to the accompanying drawings, in which: Fig. 1 is a perspective view illustrating the construction of a rotary inertial appliance according to a preferred embodiment of the present invention.

Fig. 2 is a cross sectional view of the rotary inertial appliance in Fig. 1.

Fig. 3 is a partially enlarged view of a rotary inertial body of the present invention.

Fig. 4 is a view showing the operating state of a foldable member of the present invention.

Fig. 5 is a cross sectional view of a foldable member according to another embodiment of the present invention.

Fig. 6 is a cross sectional view of rotating means according another embodiment of the present invention.

Fig. 7 is a view of a resilience member according to another embodiment of the present invention.

Fig. 8 is a view of a resilience member and rotating means according to a further embodiment of the present invention.

Best Mode for Carrying Out the Invention Reference will now be made in detail to the preferred embodiments of the present invention.

Fig. 1 is a perspective view illustrating the construction of a rotary inertial appliance according to a preferred embodiment of the present invention, and Fig. 2 is a cross sectional view of the rotary inertial appliance in Fig. 1.

The rotary inertial appliance of the present invention of the present invention includes a rotary inertial body 300, a shaft supporting the rotary inertial body, a pair of handles attached to both ends of the shaft, a resilient member, and rotating means.

The shaft includes a main shaft 110 with the rotary inertial body 300 installed, and a pair of side shafts 120 each installed to both ends of the main shaft 110 in a manner that its length is retracted or stretched.

The rotary inertial body 300 is installed around the main shaft 110, and is periodically reversed to perform continuous rotation. The rotary inertial body 300 includes an effect member for outputting a luminescent signal or sound signal to the exterior.

The handles 200 each formed integrally with both ends of the side shaft 120 are gripped by a user so that the user strengthens his/her physical strength. A plurality of wires 500 are coupled to a wire coupling member 210 provided in the center portion of the handle and are also coupled to a wheel of the rotary inertial body 300.

The rotating means for rotating the rotary inertial body 300 includes the plurality of wires 500 having a desired length and each symmetrically positioned between an outer circumference of the rotary inertial body 300, and a plurality of damping springs 510 each positioned between an end of the wire 500 and the rotary inertial body 300 for damping shock generated from reverse rotation of the rotary inertial body and for generating a reverse rotation force.

The damping spring 500 consists of a tension spring or a compression spring, and absorbs shock temporally acting on a coupled portion between the wire 500 and the rotary inertial body 300 when a rotating direction of the rotary inertial body 300 is changed after rotating at a desired speed. Furthermore, the damping spring 510 is smoothly turned in a counter direction to generate a reverse rotating force.

The rotating direction of the rotary inertial body 300 is periodically changed, so that the wire 500 is wound or unwound around the side shaft 120.

The four wires 500 which serve as the rotating means herein are arranged on both outsides of the wheel at a right angle relative to a center of the shaft, respectively. The wires 500 are symmetric with respect to the main shaft, and may be regulated depending upon a mass of the rotary inertial body 300 and resilience . force of the resilient member. If the rotary inertial appliance of the present invention is a small size, two wires may be provided on both sides of the rotary inertial body, respectively.

The compression springs 400 which serve as the resilience member herein are positioned in the side shafts 120 and the main shaft I 10, as shown in Fig. 2, to apply a resilience force outwardly to the side shafts 120.

The outside of the compression spring 400 is provided with a smooth tube of a soft material so that the compression spring 400 is smoothly operated in the shafts 110 and 120 and the generation of noise is minimized.

Instead of the smooth tube, lubricant may be coated on the outer circumference of the compression spring 400.

Fig. 3 is a partially enlarged view of the rotary inertial body 300 of the present invention. A journal 111 is positioned in the center of the main shaft 110 to secure the rotary inertial body 300 by use of a bearing 310, and articular portions 112 capable of being bent by hinge joint are positioned at both sides of the journal 111.

The journal 111 is provided at its center with an electric generating unit 710 consisting of a permanent magnet and a coil to generate electromotive force, and an effect member is positioned in the rotary inertial body 300 for outputting a signal by use of the electromotive force.

The effect member of the present invention includes the common electric generating unit 710 for generating the electromotive force, a display for showing the luminance signal or the sound signal, and a switch 730 for switching a power supply in accordance with the rotating state.

The generating unit 710 includes a permanent magnet 711 fixed to the main shaft 110 and a coil 712 movable relative to the permanent magnet 711 for generating the electromotive force in accordance with the rotation of the rotary inertial body 300.

The display includes a light emitting diode 720 for generating the luminance signal by use of the power supplied in accordance with the rotation of the rotary inertial body 300 or a loudspeaker for generating a desired sound.

The switch 730 regulates a luminance color of the light emitting diode 720 in accordance with the rotating direction of the rotary inertial body or the variation of the rotating speed, and includes a weight 731 and switching terminals 733 which are connected by a resilient piece 732 to be operated by the inertia.

It is no matter that a common dry cell may be used as effect member, instead of the complicated electric generating unit.

Fig. 4 is a view showing the operating state of a foldable member of the present invention. Each of the hinges forming both articular members 112 of the journal 111 is formed with a long hole 113 in one side thereof, and a shaft-coupling member 115 is engaged to the long hole by a connecting pin 114. The articular member 112 is inserted into a supporting tube 116 to prevent the bending of the shaft when unfolding the articular member.

The articular member facilitates carrying and packing of the rotary inertial appliance of the present invention. Specifically, if both side shafts are pulled, the shaft-coupling members 115 are left out of the supporting tube 116 by a depth of the hole 113, and then are folded in one direction.

On use, if both handles are unfolded, the side shafts are moved toward the center along the long holes 113 of the articular members 112 by the reaction force of the compression spring 400 and the wire 500, so that the articular members are unformed. A distal end of the shaft-coupling member 115 is inserted into the supporting tube 116 of the articular members 120, thereby fixing the side shafts.

Preferably, the foldable member includes a hooked spring 117 instead of the journal 111, as shown in Fig. 5. The hooked spring 117 has hooks 118 extended from both ends thereof to facilitate the folding operation.

Fig. 5 is a cross sectional view of a foldable member according to another embodiment of the present invention. The rotary inertial body 300 has a hollow portion 360 formed in inside of a tube-type wheel. Various kinds of contents are introduced in the hollow portion 360 and then the hollow portion is sealed, so that when the rotary inertial body is rotated the contents 370 flow in the tube.

It is no matter that the contents are liquid or solid such as glass beads if it can flow therein.

As an alternative, the rotary inertial body 300 is formed with a resonance chamber, and a desired resounding hole is formed on a surface of the resonance chamber, so that when the rotary inertial body 300 is rotated the sound of a whistle is generated due to the friction of the air.

The harmonization of various sounds can be achieved by changing tone depending upon the rotation direction.

Fig. 6 is a cross sectional view of rotating means according another embodiment of the present invention, in which the wire is eliminated, and the rotary

inertial body 300 can be operated in only one direction.

According to the rotating means capable of rotating the rotary inertial body in one direction, the rotary inertial body 300 is installed in the main shaft 110 via a latch gear 610 and a bearing 310 which have a characteristic of one-way rotation.

The main shaft 110 is provided on one side or double sides with at least double spiral grooves 600, and the side shaft 120 has on an inner circumference thereof a ratchet 620 inserted into the spiral grooves 600 of the main shaft 110 to convert a straight movement into a rotating movement for generating a rotating force.

The main shaft 110 and the side shafts 120 are provided with a locking piece 630 to prevent disengagement of the side shafts from the main shaft. A bearing is positioned in a contacted portion of the compression spring provided in the main and side shafts, thereby smoothly moving the compression spring therein.

Figs. 7 and 8 are views showing a resilience member according to a further embodiment of the present invention, in which the construction of the resilience member is modified to generate the resilience force on both sides of the main shaft.

The resilience member is a conical spring, and is positioned on both outsides of the main shaft 110, respectively. The resilience member 300 has a large diameter end contacted to the rotary inertial body 300, and a small diameter end opposed to the large diameter end. A thrust bearing 420 is located between the conical spring 410 and the side shaft 120.

Using the conical spring 410, a moving distance of both handles is extended, and the wire 500 is smoothly actuated.

As another embodiment, an eccentric weight having a regulating and guiding groove and a fixing screw is provided in one side of the rotary inertial body 300 for positioning and fixing the rotary inertial body, so that a center of mass of the rotary inertial body is eccentrically positioned to generate vibration when rotating.

The eccentric weight changes the center of mass of the rotary inertial body to

generate the vibration when the rotary inertial body 300 rotates, so that an arm muscle is relaxed. Therefore, the eccentric weight provides the effect of giving a massage to the arm, as well as training the arm With the construction as described above, a user may harden his or her body by use of the rotary inertial appliance of the present invention properly harmonizing the rotating force of the rotary inertial body, the resilience force of the spring, and the physical strength of the user, so that his or her upper body may be uniformly developed and an interest in sports may be induced to keep up the exercise.

Since the rotary inertial body is periodically rotated, the user regulates his or her breathing during training to strengthen functions of heart and lung and thus double the effect of the exercise.

Industrial Applicability As apparent from the above description, since the user takes exercise by use of the rotary inertial appliance by periodically changing the compressing force to the handles, muscles of breast and arm are strengthened with regular breathing in accordance with the rotation of the rotary inertial body, which is rotated in a constant period. In addition, since the training tool having a desired mass is supported by both hands and the user takes exercise with stretching his or her back, muscles of the waist and abdomen are strengthened.

Since the present invention may be smoothly operated with the resilience member being compressed and stretched and the rotating direction of the rotary inertial body being changed periodically, if the appliance is made of a small size, it can be served as a combination toy and training tool for children.