JPH0975416A - Massage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a massage device whose mechanism is embodied simply and which can be constructed small. SOLUTION: A massage device concerned has a first shaft 1 and a second shaft 2 to give a beating motion to rollers for massaging and a third shaft 7 which rotates the first and second shafts, wherewith the torque of the third shaft 7 is transmitted from the third shaft 7 to first shaft 1 through their respective transmitting elements 5, 8 and also from the third shaft 7 to second shaft 2 through their respective decelerative transmission elements 6, 10. The transmitting element 8 and decelerative element 10 are fixed to the third shaft 7 through one-way clutches 9, 11 which transmit the torque in the opposite directions, and either of the first and second shafts 1, 2 is selected and rotated only in one direction specified.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a massaging device, and more particularly to a device for driving a massaging roller built in a back portion of a chair or the like.

2. Description of the Related Art A massage device is known in which two rollers are arranged on the back of a chair and a mechanism built in the back hits or massages the user's back with the rollers. The mechanism of such a device is as shown in FIG. 2 of the accompanying drawings,
Two shafts 51 and 52 are built in parallel to the back of the chair and rotatably supported by bearings 53 and 54. One of these shaft bodies 51, 52 is selected by the mechanism of FIG. 3 described later and is rotationally driven in the direction of arrow A or B. Eccentric shaft portions 55A and 55B that are eccentric in opposite directions are provided at both ends of the shaft body 51. The shaft body 52 has inclined shaft portions 56A and 56B at both ends. The eccentric shaft portion 55A on one end side and the inclined shaft portion 56A are connected by a link mechanism 60. Eccentric shaft part 5 on the other end side
The same applies to 5B and the inclined shaft portion 56B. The link mechanism 60 includes a plate-shaped link member 61, a ball joint 62 connected to the link member 61, and an arm 64 connected to a shaft portion 62A of the ball joint 62 with a pin 63. The link member 61 rotatably supports the inclined shaft portion 56A and a non-rotating shaft-shaped support member 65.
Is attached, and the supporting member 65 holds a roller 66 for massage. The link member 61 has a thick portion 61A formed therein, and the ball joint 62 is connected to the thick portion 61A. Eccentric shaft 55A
The arm 64 swingably attached to the ball joint 62 is connected to the shaft portion 62A of the ball joint 62 by a pin 63, and the ball joint 62 is also swingable around the pin 63. Thus, when the shaft body 51 rotates in the A direction, the eccentric shaft portion 55A of the shaft body 51 causes the arm 64,
The roller 66 is reciprocated in the direction A1 via the ball joint 62 and the link member 61. This causes the roller 66 to perform a striking motion. Since the eccentric shaft portion 55B is eccentric to the eccentric shaft portion 55A in the opposite direction, the two rollers 66 alternately strike. Next, when the shaft body 52 receives rotation, the inclined shaft portion 56A rotates so as to draw a conical surface, so that the link member 61 is moved to the ball joint 62.
As a result, a reciprocating swing motion is performed, and as a result, the two rollers 66 also swing reciprocally in the B1 direction so as to come into contact with and separate from each other, and perform a rubbing operation. The mechanism for selecting and rotating one of the shaft bodies 51 and 52 has conventionally been constructed as shown in FIG. In addition, in FIG. 3, with respect to the shafts 51 and 52, all members for massage shown in FIG. 2 are omitted. In FIG. 3, a helical gear 71 is attached to the shaft body 51, and a worm gear 72 is attached to the shaft body 52. A guide shaft 73 extending in a direction perpendicular to the shaft bodies 51 and 52 is disposed below the shaft bodies 51 and 52. The guide shaft 73 has a helical gear 74 meshing with the helical gear 71 and the worm gear 72. A worm 75 that meshes with is provided rotatably with respect to the guide shaft 73. On the end faces of the bevel gear 74 and the worm 75 on the guide shaft 73 that face each other, the engaging tooth portion 74 that functions as a clutch.
A and 75A are formed respectively. The guide shaft 73
Has a trapezoidal threaded portion 76 formed between the helical gear 74 and the worm 75, and a movable helical gear 77 is screwed therein with its inner diameter. Engaging tooth portions 77A, 77B that releasably engage with the engaging tooth portions 74A, 75A are formed on both end surfaces of the movable helical gear 77. A rotary drive shaft 78 is provided in parallel with the guide shaft 73, and the arrow P,
It is rotated in the Q direction. The rotary drive shaft 7
A helical gear 79 is attached to the gear 8 and meshes with the helical teeth on the outer peripheral surface of the movable helical gear 77. In such a conventional device, when the rotary drive shaft 78 is rotated in the P direction, the movable bevel gear 77 meshing with the bevel gear 79 rotates and moves on the trapezoidal screw portion 76 of the guide shaft 73 in the R direction. The engaging tooth portion 77A of the movable helical gear 77 has a helical gear 7
The helical gear 74 is driven to rotate by engaging with the engaging tooth portion 74A of No. 4 in FIG. As a result, the shaft body 51 to which the helical gear 71 that meshes with the helical gear 74 is attached rotates in the A direction. Next, when the rotary drive shaft 78 is rotated in the Q direction, which is the opposite of the P direction, the movable helical gear 77 moves in the S direction, which is the opposite of the R direction, contrary to the above operation, and the worm 7
The shaft body 52 is rotated in the B direction by engaging with 5. Thus, the rotary drive shaft 78 is rotated forward and backward to move the movable helical gear 7
By selectively moving 7 in one of the R and S directions, one of the shafts 51, 52 can be rotated, and the tapping or rubbing operation of the roller 66 in FIG. 2 can be performed.
Since the helical gears 71 and 74 have substantially the same number of teeth, they perform a striking operation with a relatively large number of times per unit time, whereas the worm 75 to the worm gear 72 is greatly decelerated and the rotational force is increased. Is transmitted, the kneading operation is performed slowly.

It is desirable for such a massage device to have a small size and a simple structure because the mechanism for operating the roller is built in the back of the chair. However, in the conventional drive mechanism shown in FIG. 3, a guide shaft is required in addition to the rotary drive shaft, and moreover, a movable helical gear must be provided on the guide shaft, and the number of parts is large and assembly is troublesome. Again, it will become larger.
Further, the movable helical gear, the helical gear engaging with the movable helical gear, and the worm must be formed with engaging teeth having a complicated shape, which is disadvantageous in terms of cost. In addition to this, in terms of function, there is a meshing sound at the time of the switching engagement at the engaging tooth portion, which is a feeling to the ear. Further, in the engaging tooth portion, since play is required between the teeth for meshing, the roller wobbles during the rubbing operation. The present invention solves the problems of the conventional device, can be manufactured inexpensively as a small and simple structure, has a low noise when used, and has a drive mechanism that can stabilize the roller when not in use. The purpose is to provide.

According to the present invention, a first shaft body and a second shaft body are arranged such that their axes of rotation are parallel to each other, a link mechanism for connecting them, and a roller attached to the link mechanism. The mechanism regarding may be the same as the conventional one. That is, having eccentric shaft portions at both ends of the first shaft body,
The second shaft portion has inclined shaft portions at both ends, and the eccentric shaft portion and the inclined shaft portion at each end are rotatably connected by a link member. Then, a roller for massage is attached to the link mechanism. The feature of the present invention resides in that the first shaft body and the second shaft body are driven by a single third shaft body. The rotational driving force of the third shaft body is transmitted from the third shaft body to the first shaft body through mutual transmission elements, and from the third shaft body to the second shaft body through mutual reduction transmission elements. It is supposed to be done. At that time, the transmission element and the deceleration transmission element of the third shaft body are respectively attached to the third shaft body via the one-way clutches that transmit the driving force in opposite rotation directions. Thus, either the first shaft body or the second shaft body is selected by the rotation direction of the third shaft body and the one-way clutch operating in that direction, and the rotation drive from the third shaft body is performed via the one-way clutch. It receives force and rotates. As a result, the roller comes to perform a beating operation or a kneading operation.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG. 1 of the accompanying drawings. The apparatus of FIG. 1 is assembled and used in the mechanism described above as shown in FIG. In FIG. 1, the first shaft body 1 and the second shaft body 2 have bearings similar to the bearings 53 and 54 shown in FIG. It is rotatably supported by (not shown). Eccentric shaft portions 1A and 1B are provided at both ends of the first shaft body 1. The eccentric shaft portion 1
Although A and 1B extend in parallel with the rotation axis 3, the centers are eccentric by a distance δ in opposite directions in the radial direction. A helical gear 5 is attached as a transmission element to substantially the center of the first shaft 1. Inclined shaft portions 2A and 2B are provided at both ends of the second shaft body 2.
Both A and 2B extend upward in FIG. 1 with an angle θ. A worm gear 6 is attached as a speed reduction transmission element to substantially the center of the second shaft body 2. Below the first shaft body 1 and the second shaft body 2, a third shaft body 7 extending in a direction perpendicular to the first shaft body 1 and the second shaft body 2 is rotatably supported by a bearing (not shown). The third shaft body is rotationally driven by decelerating the rotation speed of the motor by a motor, a belt, a pulley, etc., not shown, and selecting one of the forward and reverse directions (P and Q directions in the drawing). To the third shaft body 7, a helical gear 8 as a counterpart transmission element that meshes with the helical gear 5 as a transmission element is attached via a one-way clutch 9.
When the third shaft body 7 is rotationally driven in the P direction, the one-way clutch 9 transmits the rotational force to the helical gear 8 to rotate it in the same P direction. In addition, the third shaft body 7,
A worm 10 as a counterpart deceleration transmission element that meshes with the worm gear 6 as the deceleration transmission element is attached via another one-way clutch 11. The one-way clutch 11 applies a rotational force to the worm 10 when the third shaft body 7 is rotationally driven in the Q direction opposite to the P direction.
To rotate in the same Q direction. Thus,
When the third shaft body 7 is rotated in the P direction, only the first shaft body 1 rotates in the A direction, and the second shaft body 2 rotates in the one-way clutch 11.
Does not rotate because it becomes free. When the third shaft body 7 is rotated in the Q direction, only the second shaft body 2 rotates in the B direction, and the first shaft body 1 does not rotate because the one-way clutch 9 becomes free. In this example, as a preferable case, the second shaft body 2 is provided with a lock member 12 for preventing reverse rotation. The lock member 12 gives a rubbing operation to the roller 66 by the rotation of the second shaft body 2. However, even if the user gives an external force to the roller 66 so as to separate the two rollers 66 from each other by the pressure of the back, The second shaft 2 is prevented from rotating in that direction. According to the massage apparatus of the present example, when the user selects the "striking" switch, the third shaft body 7 rotates in the P direction and only the first shaft body 1 rotates in the A direction in FIG. The second shaft body 2 remains unrotated. As a result, the link mechanism 60 shown in FIG. 2 causes the roller 66 to reciprocate in the A1 direction to perform a striking operation. Next, when the user switches the switch to the "rubbing" direction, the third shaft body 7 rotates in the Q direction and only the second shaft body 2 rotates in the B direction in FIG. The first shaft body 1 remains in a non-rotating state. As a result, the link mechanism 60 of FIG.
The roller 66 reciprocally swings in the B1 direction to perform a rubbing operation. In that case, the ratio of the number of teeth of the helical gears 5 and 8 is set to 1 or a value close to that in the "beating" operation, and the tapping is performed at a number close to the rotation speed of the third shaft body 7. In the "rubbing" operation, the speed is greatly reduced between the worm 10 and the worm gear, so that the "rubbing" operation is performed slowly. In the present invention, the transmission element or the deceleration transmission element is not limited to the above-mentioned helical gear or worm and worm gear. For example, a belt structure may be adopted without depending on these gears.

As described above, according to the present invention, the third shaft body having the one-way clutch is used to selectively drive the first shaft body and the second shaft body. Compared with the conventional device, the mechanism is simpler and more compact, the manufacturing cost is low, and the assembly is extremely easy.
Further, if the lock member is provided on the second shaft body, there is no inconvenience that the two massage rollers are separated from each other by the pressure of the user's back during the rubbing operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a drive mechanism of the present invention.

FIG. 2 is a perspective view of a massage device using the device of FIG.

FIG. 3 is a perspective view of a drive mechanism of a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st shaft body 1A, 1B Eccentric shaft part 2 2nd shaft body 2A, 2B Inclination shaft part 7 3rd shaft body 5,8 Transmission element (bevel gear) 6,10 Reduction transmission element (worm gear and worm) 9 One-way clutch 11 One-way clutch 12 Lock member 60 Link mechanism

Claims (2)

[Claims] 1. A first shaft body and a second shaft body are supported so that their rotation axes are parallel to each other, and the first shaft body is eccentric and parallel to the rotation axis of the first shaft body at both ends. Has an eccentric shaft portion extending to the second shaft body, and the second shaft body has inclined shaft portions at both ends extending obliquely with respect to the rotation axis of the second shaft body, and the first shaft body and the second shaft body have both ends. Are connected by a link mechanism that rotatably supports the eccentric shaft portion and the inclined shaft portion, respectively, and the link mechanisms at both ends are provided with shaft-shaped support members extending in directions facing each other, and the support members are used for massage. , Which has a third shaft body that rotationally drives the first shaft body and the second shaft body, and from the third shaft body to the first shaft body through mutual transmission elements, It is possible to transmit the rotational driving force of the third shaft body from the three shaft body to the second shaft body through the respective deceleration transmission elements. The shaft transmission element and the deceleration transmission element are
The first shaft body and the second shaft body are respectively attached to the third shaft body through one-way clutches that transmit driving forces in opposite rotational directions, and either one of the first shaft body and the second shaft body is selected and rotates only in a predetermined direction. Massage device characterized in that 2. The massage device according to claim 1, wherein the second shaft body is provided with a lock member for preventing rotation in a direction opposite to a predetermined direction.