TWI702975B - Rhythm device - Google Patents

Abstract

The present invention relates to a rhythm device, which includes a seat cushion, a base arranged under the seat cushion, and an intermediate seat arranged between the seat cushion and the base. The bottom surface of the seat cushion has two first slide grooves, the top surface of the base has two second slide grooves, the first slide groove of the seat cushion and the second slide groove of the base are perpendicular to each other, the middle seat has two first rollers and two The second roller, the middle seat uses the two first rollers and the two second rollers to be respectively arranged in the two first slide grooves of the seat cushion and the two second slide grooves of the base, so that the seat cushion can independently follow the first slide One direction moves relative to the base and the middle base, and on the other hand, the middle base moves relative to the base along a second direction perpendicular to the first direction. Thereby, the rhythm device of the present invention can achieve the effect of multi-directional rhythm.

Description

Rhythm device

The present invention relates to fitness equipment, and particularly refers to a rhythmic device that can be used for multi-directional exercise.

Among the existing indoor sports equipment, the more common ones are treadmills, steppers, or elliptical machines. These sports equipment are high-intensity training. Although they can achieve fitness effects, they are not suitable for people with arthritis or heart disease. In other words, it is not suitable to use these sports equipment for fitness.

In order to solve the above problems, there is currently a rhythmic device that allows the user to lie, sit or stand on it, and then give the body regular exercise. It has many benefits for promoting blood circulation, relaxing muscles and increasing joint mobility. It is suitable for users who are difficult to perform high-intensity training, but the traditional rhythm device only has a single direction of rhythm training, and the training effect that can actually be achieved is quite limited.

The main purpose of the present invention is to provide a rhythm device, which can realize two-way rhythm to improve the training effect.

In order to achieve the above main objective, the rhythm device of the present invention includes a seat cushion, a base, and an intermediate seat. The bottom surface of the seat cushion has two first sliding grooves parallel to each other, each of the first sliding grooves extends along a first direction; the base is arranged below the cushion, and the top surface of the base has two parallel Second sliding grooves, each of the second sliding grooves extending along a second direction perpendicular to the first direction; the middle seat is arranged between the seat cushion and the base, and the middle seat has two opposite first rollers And two opposing second rollers, the middle seat is arranged in one of the first sliding grooves of the seat cushion by using each of the first rollers, so that the seat cushion can stand alone along the first direction relative to the base and the middle When the seat moves, the middle seat uses each of the second rollers to be arranged in one of the second sliding grooves of the base, so that the middle seat and the seat cushion move along the second direction relative to the base.

It can be seen from the above that the rhythm device of the present invention allows the user to choose to perform horizontal rhythm in the first direction or the second direction according to actual needs, and even the two can be matched with each other to form a rotary rhythm, so many changes in operation Can effectively improve the training effect.

Preferably, the seat cushion has a cushion body, a support seat and an upper pressing button. The support seat is arranged on the bottom surface of the cushion body, and the top surface of the support seat has a pocket, the bottom wall of the pocket has a first stopper, and the upper press button has a head and a body, One end of the body is connected to the head, the other end of the body has a first tooth, the head of the upper button protrudes out of the cushion body, and the body of the upper button is located in the housing of the support seat In the groove, and the bottom surface of the body of the upper button has a second stopper, the middle seat further has a bearing plate provided with the two first rollers and the two second rollers, and one side of the bearing plate It has a second tooth. Thereby, when the upper button is located at a positioning position, the first tooth portion of the body of the upper button is engaged with the second tooth portion of the bearing plate of the middle seat, and the body of the upper button The second stopper portion of the support seat is clamped with the first stopper portion of the support seat, so that the seat cushion cannot move along the first direction relative to the base and the intermediate seat. When the upper press button is in a release position , The first tooth part of the body of the push button is separated from the second tooth part of the bearing plate of the middle seat, and the second stop part of the body of the upper push button and the first stop of the support seat The parts are separated from each other, so that the seat cushion can move relative to the base and the middle seat along the first direction.

Preferably, the seat cushion further has a return spring which is arranged in the receiving groove of the support seat and pushes the upper pressing button away from the intermediate seat to keep the upper pressing button in The release position.

Preferably, the body of the upper button has a through hole penetrating through the top and bottom surfaces, and the seat cushion further has a bolt, a nut and a positioning spring, and the bolt penetrates through the through hole from top to bottom. The nut is screwed on the bolt, and the positioning spring is sleeved on the bolt and pushes down the top surface of the body of the upper push button to keep the upper push button at the positioning position.

Preferably, the seat cushion further has two first rails, each of the first rails is provided on the bottom surface of the support base and has a first chute, and each of the first rails is provided with one at each end Stoppers, the two stoppers are used to block the first roller from separating from the first sliding groove.

Preferably, the base has a bottom plate and a stop plate. The top surface of the bottom plate has a guide groove located between the two second sliding grooves, the middle seat further has a bearing plate provided with the two first rollers and the two second rollers, and the bottom surface of the bearing plate has a guide The guiding portion, the guiding portion of the supporting plate is disposed in the guiding groove of the bottom plate so as to be displaceable along the second direction, the bottom plate further has a positioning groove communicating with the guiding groove, and the stop plate is disposed on the bottom plate The lower part can be horizontally displaced relative to the bottom plate between a positioning position and a release position along the first direction, and the top surface of the stop plate has a positioning protrusion. Thereby, when the stop plate is located at the positioning position, the positioning protrusion of the stop plate is embedded in the positioning groove of the bottom plate and interferes with the guide part of the bearing plate of the middle seat, so that the middle The seat cannot move relative to the base along the second direction. When the stop plate is in the release position, the positioning protrusion of the stop plate separates from the positioning groove of the bottom plate and is guided by the bearing plate of the intermediate seat The parts do not interfere with each other, so that the middle seat can move relative to the base along the second direction.

Preferably, the two opposite sides of the bottom plate respectively have an opening, and each of the openings is adjacent to the second sliding groove, and the stop plate has a plate body, two arm portions and two push buttons. The top surface of the body is provided with the positioning convex portion, one end of the two arm portions is connected with the board body, the other end of the two arm portions is respectively connected with a pressing button, and each pressing button is located in an opening of the bottom plate. Thereby, when one of the push buttons is pushed, the stop plate can be moved from the release position to the positioning position, and when the other push button is pushed, the stop plate is moved from the positioning position to the release position. position.

Preferably, there are two positioning grooves on the bottom plate, and two positioning protrusions on the stop plate. The two positioning grooves and the two positioning protrusions are located on two opposite sides of the guide groove. And the distance between the two positioning grooves is smaller than the distance between the two positioning protrusions. Thereby, as long as there is a positioning convex part embedded in the corresponding positioning groove, the positioning effect can be provided to the intermediate seat.

The detailed structure, characteristics, assembly or use of the rhythm device provided by the present invention will be described in the detailed description of the subsequent embodiments. However, those with ordinary knowledge in the field of the present invention should be able to understand that these detailed descriptions and specific examples for implementing the present invention are only used to illustrate the present invention, and are not intended to limit the scope of the patent application of the present invention.

The applicant first explains here that throughout the specification, including the following embodiments and claims in the scope of the patent application, the nouns related to directionality are based on the directions in the drawings. Secondly, in the following embodiments and drawings, the same element numbers represent the same or similar elements or structural features.

Please refer to FIGS. 1 to 3, the rhythm device 10 according to the first embodiment of the present invention includes a seat cushion 20, a base 40, and an intermediate seat 56.

The seat cushion 20 has a cushion body 22, a support seat 26 and two first rails 34. The cushion body 22 is rectangular and is made of soft materials such as foam; the support seat 26 is provided under the cushion body 22 to provide a supporting effect for the cushion body 22; the two first rails 34 are fixed on On the left and right sides of the bottom surface of the support base 26, each first rail 34 has a first chute 36 extending along the first direction D1, and each first rail 34 is provided at the front and rear ends of each first rail 34. Cylindrical stopper 38.

The base 40 is disposed under the seat cushion 20 and has a bottom plate 42 and two second rails 50. The bottom plate 42 is rectangular and is made of materials such as plastic; the two second rails 50 are fixed on the front and rear sides of the top surface of the base 40 and each have a second rail perpendicular to the first direction D1. A second sliding slot 52 extending in two directions D2. In addition, the center of the top surface of the bottom plate 42 further has a guide groove 44 located between the two second sliding grooves 52, and the left and right ends of the guide groove 44 are respectively provided with an end cover 54.

The middle seat 56 is arranged between the seat cushion 20 and the base 40 and has a rectangular bearing plate 58. The bottom surface of the bearing plate 58 has two pairs of guiding parts 60 arranged in a left and right arrangement. The two pairs of the bearing plates 58 guide The guiding portion 60 is inserted into the guiding groove 44 of the bottom plate 42 in a movable manner and is blocked by the two left and right end covers 54 and will not fall out of the guiding groove 44. In addition, the four corners of the bearing plate 58 are respectively provided with a first roller 64 and a second roller 66, wherein the first roller 64 is provided in the first sliding groove 36 of the seat cushion 20 and can be supported by two front and rear stoppers 38 The second roller 66 is arranged in the second chute 52 of the base 40 and is blocked by the two pairs of guide portions 60 of the bearing plate 58 by the two left and right end covers 54 Relationship without departing from the second chute 52. Thereby, the middle seat 56 will move along the second direction D2 relative to the base 40 together with the seat cushion 20, but because the second roller 66 is restricted by the second sliding groove 52, only the seat cushion 20 will move along the first A direction D1 moves relative to the base 40 and the intermediate base 56.

Please continue to refer to FIG. 2, the left and right sides of the cushion body 22 respectively have a first elongated hole 24, and the left and right sides of the support base 26 respectively have two second elongated holes 28 and a second elongated hole 28. The slots 30 between the holes 28, the bottom wall of each slot 30 has four first stop portions 32 parallel to each other, each first rail 34 has a third long hole 37, and the middle seat 56 supports The left and right sides of the plate 58 respectively have a second tooth portion 62. In addition, the seat cushion 20 further has two upper pressing buttons 68, four return springs 80, and two positioning springs 82, of which:

The upper button 68 has a head 70 and a body 72. One end of the body 72 is connected to the head 70, and the other end of the body 72 has a first tooth 74. As shown in FIG. 4, the upper button 68 The head 70 is arranged in the first elongated hole 24 of the cushion body 22 and one of the second elongated holes 28 of the support seat 26 and partially protrudes out of the cushion body 22. The body 72 of the upper pressing button 68 penetrates Between the other second elongated hole 28 of the support base 26 and the third elongated hole 37 of the first rail 34 and in the receiving groove 30 of the support base 26, the size of the upper push button 68 is slightly smaller than that of the support base 26 The size of the second long hole 28. As shown in Figures 2 and 4, the bottom surface of the body 72 of the upper push button 68 has four second stop portions 76 that are parallel to each other, and the body 72 of the upper push button 68 has a body 72 that penetrates the top and bottom surfaces. Perforation 78.

The four return springs 80 are arranged in pairs. Each pair of return springs 80 is disposed in the receiving groove 30 of the support base 26 and is located between the two adjacent first stop portions 32 to provide elastic force to push the upper pressing button 68 away from the middle base 56.

The positioning spring 82 is sleeved on a bolt 84 and abuts against the body 72 of the upper push button 68 with its bottom end. The bolt 84 passes through the perforation 78 of the body 72 of the upper push button 68 from top to bottom and is screwed to a The nut 86 embedded in the support base 26 allows the positioning spring 82 to provide elastic force to push the upper pressing button 68 downward.

It can be seen from the above that when the head 70 of the upper push button 68 is not pressed by external force, the first tooth 74 of the body 72 of the upper push button 68 is separated from the second tooth 62 of the bearing plate 58 of the middle seat 56. And the second stop 76 of the body 72 of the upper push button 68 and the first stop 32 of the support seat 26 are separated from each other. At this time, the upper push button 68 is subjected to the elastic force of the return spring 80 and remains in the position shown in the figure. The release position P2 shown in 4 enables the seat cushion 20 to move relative to the base 40 and the middle seat 56 along the first direction D1; conversely, when the head 70 of the upper button 68 is pressed by an external force, the body of the upper button 68 The first teeth 74 of the portion 72 and the second teeth 62 of the bearing plate 58 of the intermediate seat 56 engage with each other, so that the return spring 80 is squeezed by the upper pressing button 68 to accumulate elastic restoring force, and the upper pressing button 68 The second stop portion 76 of the body 72 and the first stop portion 32 of the support seat 26 are clamped with each other. At this time, the upper press button 68 will be subjected to the elastic force of the positioning spring 82 to maintain the position as shown in FIG. 5 The position P1 prevents the seat cushion 20 from moving relative to the base 40 and the middle seat 56 along the first direction D1, but can only move along the second direction D2 along with the middle seat 56.

Please refer to FIG. 3 again. The front and rear sides of the bottom plate 42 respectively have an opening 46 adjacent to the second sliding groove 52. The bottom plate 42 further has four positioning grooves 48 passing through the top and bottom surfaces. 48 is arranged on the front and back sides of the guide groove 44 in a paired manner, and both are connected with the guide groove 44. In addition, the base 30 further has a stop plate 88. The stop plate 88 is located below the bottom plate 42 and has a plate body 90, two arms 94 and two push buttons 96. The top surface of the plate body 90 is on the front and rear sides. Each has two positioning protrusions 92 arranged at intervals. The distance between the two positioning protrusions 92 is greater than the distance between the two positioning grooves 48. One end of the two arm portions 94 is respectively connected to the front and back of the board 90 On the side, the other ends of the two arms 94 are respectively connected to a pressing button 96, and each pressing button 96 is located in the two openings 46 at the front and rear of the bottom plate 42. In addition, the plate body 90 further has two long grooves 98. Two screws 99 respectively pass through the two long grooves 98 of the plate body 90 and are locked in the two screw holes 49 on the bottom surface of the bottom plate 42 to stop The plate 88 can move horizontally relative to the bottom plate 40 along the first direction D1.

It can be seen from the above that when the stop plate 88 is at the release position P4 as shown in FIG. 6, the two pairs of positioning protrusions 92 before and after the stop plate 88 are all located outside the positioning groove 48 of the bottom plate 42 and to the left and right of the intermediate seat 56 The two guiding parts 60 do not interfere with each other, so that the middle seat 56 together with the seat cushion 20 can move relative to the base 40 along the second direction D2; on the contrary, when one of the push buttons 96 is pressed by an external force, the stop plate 88 A pair of positioning protrusions 92 are embedded in the corresponding positioning grooves 48 and interfere with the guide 60 of the intermediate seat 56. At this time, the stop plate 88 is located at the positioning position P3 as shown in FIG. This makes the middle seat 56 unable to move relative to the base 40 along the second direction D2, but can allow the seat cushion 20 to reciprocate along the first direction D1. When another push button 96 is pressed, the stop plate 88 can be returned as Figure 6 shows the release position P4.

Therefore, if the upper pressing button 68 is located at the release position P2 as shown in FIG. 4 and the stop plate 88 is at the release position P4 as shown in FIG. 6, the seat cushion 20 can move back and forth along the first direction D1. , It can also move back and forth along the second direction D2; if the upper press button 68 is located at the positioning position P1 as shown in FIG. 5 and the stop plate 88 is at the release position P4 as shown in FIG. 6, the seat cushion 20 can only move along Move back and forth in the second direction D2; if the upper press button 68 is at the release position P2 as shown in FIG. 4 and the stop plate 88 is at the positioning position P3 as shown in FIG. 7, the seat cushion 20 can only move along the first direction D1 moves back and forth; if the upper pressing button 68 is at the positioning position P1 as shown in FIG. 5 and the stop plate 88 is at the positioning position P3 as shown in FIG. 7, the seat cushion 20 remains fixed.

In actual operation, the user can choose to operate in different postures and different display positions according to actual needs. For example, in Figure 8a, the rhythm device 10 is placed on a chair, and then the user operates in the posture of sitting on the chair. In Figure 8b, the rhythm device 10 is placed on the ground, and the user sits on the ground and puts the hips on the ground. Operate in the posture on the seat cushion 20. In Fig. 8c, the rhythm device 10 is placed on the ground, and then the user sits on the ground and puts his feet on the seat cushion 20 to operate. In Fig. 8d, the rhythm is The device 10 is placed on the ground, and then the user operates in a lying position with the buttocks on the seat cushion 20. As for the rhythm device 10 in Figure 8e, the rhythm device 10 is placed on the ground, and then the user is lying with the feet The operation is performed with the heel on the seat cushion 20. Regardless of the aforementioned position or posture, the reciprocating movement of the seat cushion 20 in the first direction D1 can be used to give the body a regular movement in the front and rear directions, or the reciprocating movement of the seat cushion 20 in the second direction D2 during operation. To give the body regular movement in the left and right directions, it is even possible to give the body a regular movement similar to in-situ rotation through the alternate reciprocating movement of the seat cushion 20 in the first direction D1 and the second direction D2.

Finally, it needs to be supplemented that the structure of the present invention can be further adjusted according to actual needs. As shown in FIG. 9, in the second embodiment of the present invention, a third rail 35 is further provided on the bottom surface of the seat cushion 20, and the third rail 35 has two third sliding grooves 39 parallel to the first sliding groove 36. The top surface of the bottom plate 42 is further provided with a fourth rail 53, and the fourth rail 53 has two fourth sliding grooves 55 parallel to the second sliding groove 52. As for the bearing plate 58 provided by the middle seat 56 in a cross shape, the left and right ends of the bearing plate 58 are respectively provided with a first roller 64 and two fourth rollers 67, and the fourth roller 67 is provided on the first roller. In the four sliding grooves 55, the front and rear ends of the supporting plate 58 are respectively provided with a second roller 66 and two third rollers 65, of which the third roller 65 is arranged in the third sliding groove 39. As a result, the second embodiment of the present invention utilizes the addition of the third slide groove 39, the third roller 65, the fourth slide groove 55 and the fourth roller 67 to increase the three elements of the seat cushion 20, the base 40 and the intermediate seat 56 The stability and smoothness of the operating process, and because of structural changes, the seat cushion 20 can change its appearance to a rounder shape, so that the sides are not limited by the elongated chute.

In summary, the rhythm device 10 of the present invention can allow the user to choose to perform horizontal rhythm only along the first direction D1 or the second direction D2 according to actual needs, or to select the two directions to match each other for rotating Rhythm, with so many changes of operations, can effectively enhance the training effect and increase the fun of use.

10: Rhythm device 20: seat cushion 22: Pad body 24: The first long hole 26: Support seat 28: The second long hole 30: container 32: The first stop 34: The first track 35: The third track 36: The first chute 37: The third long hole D1: First direction 38: stop 39: Third Chute 40: base 42: bottom plate 44: Guide groove 46: opening 48: positioning groove 49: screw hole 50: second track 52: second chute D2: second direction 53: Fourth Track 54: end cap 55: Fourth Chute 56: Middle seat 58: bearing plate 60: Guiding Department 62: second tooth 64: The first roller 65: third roller 66: second roller 67: fourth roller 68: Up button 70: head 72: Body 74: first tooth 76: second stop 78: Piercing 80: return spring 82: positioning spring 84: Bolt 86: Nut P1: Positioning position P2: Release position 88: Stop plate 90: plate body 92: positioning convex 94: Arm 96: Down button P3: Positioning P4: Release position 98: Long Groove 99: screw

Fig. 1 is a perspective view of a rhythm device according to a first embodiment of the present invention. Fig. 2 is a partial three-dimensional exploded view of the rhythm device of the first embodiment of the present invention. Fig. 3 is another partial three-dimensional exploded view of the rhythm device of the first embodiment of the present invention. Fig. 4 is a partial cross-sectional view of the rhythm device of the first embodiment of the present invention, the main upper pressing button is in the release position. Figure 5 is similar to Figure 4, and mainly shows that the upper button is located at the positioning position. 6 is a cross-sectional view of the rhythm device according to the first embodiment of the present invention, mainly showing that the stop plate is in the release position. Fig. 7 is similar to Fig. 6 and mainly shows that the stop plate is located at the positioning position. 8a to 8e are perspective views of the usage state of the rhythm device according to the first embodiment of the present invention. Fig. 9 is a partial three-dimensional exploded view of the rhythm device of the second embodiment of the present invention.

10: Rhythm device

20: seat cushion

22: Pad body

40: base

42: bottom plate

44: Guide groove

50: second track

52: second chute

70: head

96: Down button

D1: First direction

D2: second direction

Claims (9)

A rhythmic device comprising: a cushion, the bottom surface of the seat cushion has two parallel first sliding grooves, each of the first sliding grooves extends along a first direction, wherein the seat cushion has a cushion body, a A supporting seat and an upper pressing button, the supporting seat is arranged on the bottom surface of the cushion body, and the top surface of the supporting seat has a receiving groove, the bottom wall of the receiving groove has a first stopping part, and the upper pressing button has A head and a body, one end of the body is connected to the head, the other end of the body has a first tooth, the head of the upper button protrudes out of the cushion, the body of the upper button Part is located in the receiving groove of the support seat, and the bottom surface of the body of the upper button has a second stop part; a base is arranged under the seat cushion, and the top surface of the base has two parallel first Two sliding grooves, each of the second sliding grooves extending along a second direction perpendicular to the first direction; and a middle seat provided between the seat cushion and the base, the middle seat having two opposite first rollers And two opposite second rollers, each of the first rollers is arranged in one of the first sliding grooves of the seat cushion, so that the seat cushion moves relative to the base and the intermediate seat along the first direction, and each second The roller is arranged in one of the second sliding grooves of the base, so that the seat cushion and the middle seat move relative to the base along the second direction, wherein the middle seat has a second first roller and the second second A bearing plate of two rollers, one side of the bearing plate has a second tooth part, when the upper pressing button is in a positioning position, the first tooth part of the body of the upper pressing button and the bearing plate of the middle seat The second teeth of the upper button are engaged with each other, and the second stop portion of the body of the upper button is connected to the first The blocking parts are mutually clamped, so that the seat cushion cannot move along the first direction relative to the base and the intermediate seat. When the upper press button is in a release position, the first tooth part of the body of the press button and The second tooth portions of the bearing plate of the middle seat are separated from each other, and the second stop portion of the body of the upper push button is separated from the first stop portion of the support seat, so that the seat cushion can follow the first stop One direction moves relative to the base and the middle seat. The rhythm device according to claim 1, wherein the seat cushion further has a return spring, the return spring is arranged in the receiving groove of the support seat and pushes the upper pressing button away from the middle seat for Keep the upper press button in the release position. The rhythm device according to claim 1, wherein the body of the upper button has a through hole penetrating through the top and bottom surfaces, and the seat cushion further has a bolt, a nut and a positioning spring, and the bolt is from top to bottom Pass through the perforation, the nut is screwed on the bolt, the positioning spring is sleeved on the bolt and pushes down the top surface of the body of the upper push button to keep the upper push button in the position position. The rhythm device according to claim 1, wherein the seat cushion further has two first rails, each of the first rails is provided on the bottom surface of the support seat and has the first slide groove, and each of the first rails The two ends are respectively provided with a stopper, and the two stoppers are used to block a first roller from leaving a first sliding groove. The rhythm device of claim 1, wherein the base has a bottom plate and a stop plate, the top surface of the bottom plate has a guide groove between the two second sliding grooves, and the middle seat has a The bearing plate of the two first rollers and the two second rollers, the bottom surface of the bearing plate has a guiding part, and the guiding part of the bearing plate is disposed in the guide groove of the bottom plate so as to be displaceable along the second direction, The bottom plate has a through the top and bottom Through the positioning groove of the guide groove, the stop plate is arranged under the bottom plate and can be horizontally displaced relative to the bottom plate along the first direction between a positioning position and a release position. The top surface of the stop plate has A positioning protrusion. When the stop plate is at the positioning position, the positioning protrusion of the stop plate is embedded in the positioning groove of the bottom plate and interferes with the guide part of the bearing plate of the intermediate seat, so that The intermediate seat cannot move relative to the base along the second direction. When the stop plate is in the release position, the positioning protrusion of the stop plate separates from the positioning groove of the bottom plate and is in contact with the bearing plate of the intermediate seat. The guiding parts do not interfere with each other, so that the middle seat can move relative to the base along the second direction. The rhythm device according to claim 5, wherein the two opposite sides of the bottom plate respectively have an opening, and each of the openings is adjacent to the second sliding groove, and the stop plate has a plate body, two arms and two lower parts. Press button, the top surface of the plate body has the positioning protrusion, one end of the two arm portions is connected to the plate body, the other end of the two arm portions is respectively connected to a press button, and each press button is located on the bottom plate One in the opening. The rhythm device according to claim 5, wherein the base further has two second rails, and each of the second rails is provided on the top surface of the bottom plate and has the second sliding groove. The rhythm device according to any one of claims 5 to 7, wherein the bottom plate has two positioning grooves, the top surface of the stop plate has two positioning protrusions, the two positioning grooves and the two positioning protrusions The parts are located on two opposite sides of the guiding groove, and the distance between the two positioning grooves is smaller than the distance between the two positioning convex parts. The rhythm device according to claim 1, wherein the bottom surface of the seat cushion further has two third sliding grooves parallel to each other, each of the third sliding grooves extends along the first direction, and the base The top surface further has two fourth sliding grooves parallel to each other, and each of the fourth sliding grooves extends along the second direction. The middle seat further has two opposite third rollers and two opposite fourth rollers. Three rollers are arranged in one of the third sliding grooves of the seat cushion, and each of the fourth rollers is arranged in one of the fourth sliding grooves of the base.

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