JPH0156778B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a pine surge machine, particularly a pine surge machine that has a function of self-propelled up and down along a guide rail, in which the pine surge mechanism is protected from vertical impact applied to the pine surge mechanism. This invention relates to an impact protection device for pine surge machines.

[Background Art] A pine surge machine that moves vertically by itself is usually configured so that it does not descend due to its own weight when not in operation. By the way, the impact force caused by a fall is many times greater than the force applied during use, and to be able to withstand this impact, it must have extremely high strength, weight, and size. However, it is disadvantageous in terms of cost.
In particular, an increase in weight increases the inertial mass of the pine surge mechanism, making it difficult to reduce the weight while satisfying impact resistance.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to prevent the pine surge mechanism from being affected by a large impact such as when falling. Moreover, it is an object of the present invention to provide an impact protection device for a pine surge machine that hardly causes an increase in weight.

[Disclosure of the Invention] Accordingly, the present invention includes a drive shaft that receives power from a drive source and rotates to move the treatment means block up and down along the guide rail, and
In a pine massage machine in which the drive source and the drive shaft move up and down together with the treatment means, the drive source and the drive shaft are connected by a spring bias, and the drive shaft is disconnected from the drive source by an overload in the direction along the guide rail. It is characterized by a clutch that functions as a torque limiter that can be disconnected to free the rotation and vertical movement of the drive shaft, and when an impact such as a fall impact is applied, the clutch will stop the drive shaft regardless of the operation of the drive source. rotates to allow the treatment means block to descend, and this descent absorbs shock.

Next, the present invention will be described in detail based on an embodiment of a pine surge machine shown in the drawings in which a pine surge mechanism is incorporated into the backrest of a chair. The chair is made up of an underframe 2 made of pipes and equipped with a seat and armrests, and a backrest frame 1 also made of pipes, with the lower end of the frame 1 pivoting to the underframe 2. A gas spring 15 is attached between the frame 1 and the under frame 2 to allow the backrest to recline freely. A pair of guide rails 12 each having a U-shaped cross section and facing opening surfaces are fixed to both sides of the frame 1 of the backrest. Also, at the upper end of the frame 1 is a headrest 13.
A cover sheet 14 is attached to the front of the frame 1, and a vertically long support belt 99 is attached to both sides of the back of the cover sheet 14.
are arranged.

Now, the pine surge mechanism has a control box 26 on one side.
and the control box 26 and the connecting plate 28 on the other side.
The main shaft 4 is rotatably driven as a treatment means block, and a pair of wheels 3 are attached to the main shaft 4 eccentrically in the same direction and inclined in opposite directions. . Each wheel body 3 has an eccentric inner ring 20 fixed to the main shaft 4
and an outer ring 21 which is arranged on the outer periphery via a ball 22 so as to be freely reversible.
The inner circumferential portion and the outer circumferential portion are connected by a large number of ribs 23. As is clear from FIG. 3, the main shaft 4 is a hollow pipe into which the drive shaft 5 is inserted.
Furthermore, a cylindrical body 62 is reversibly fitted to both ends. The drive shaft 5 has cylinder bodies 62 connected to both ends thereof, and the cylinder bodies 62 have rollers 19 running on the guide rails 12 and each guide rail 12.
A pinion 18 is provided which meshes with a rack 11 attached to the pinion. Rollers 19 are also provided on both the control box 26 and the gear box 27. A motor M, which is a driving source and can freely rotate forward and backward, is provided on the side of a gearbox 27, with the gearbox 27 serving as a housing for the stator 17, and connects the main shaft 4 and the drive shaft 5 via a reduction gear in the gearbox 27. Drive selectively. When the main shaft 4 is rotationally driven, the eccentrically inclined wheel body 3 also rotates at the same time, and due to the eccentricity of the wheel body 3, the amount of protrusion of the wheel body 3 toward the cover sheet 14 is changed periodically. Further, since the wheels 3 are inclined in opposite directions, the distance between the pair of wheels 3 at the contact portion with the cover sheet 14 is changed periodically. The combination of these two movements results in a fir tree surge to the human body. If the drive shaft 5 is rotated instead of the main shaft 4, the pinion 18 that engages with the rack 11 of the frame 1 rotates 1.
The entire pine surge mechanism is self-propelled in the vertical direction of the backrest by the travel guide 9. This self-propelling causes the wheel body 3, which is a treatment element, to move, and by reciprocating within a certain range, the wheel body 3 covers the back of the human body with the cover sheet 14.
It is meant to be rubbed through the pine serge. Furthermore, this pine surge machine is equipped with a mechanism that makes the width between the pair of wheels 3 variable. This is main shaft 4
It is composed of a feed screw 6 parallel to the drive shaft 5, and a pair of connecting arms 25 that connect the feed screw 6 and the inner ring 20 of each wheel body 3. One end is a right-hand threaded part and the other is a left-hand threaded part from the center in the direction, and a connecting arm 25 has one end screwed into each threaded part. The other end of both connecting arms 25 is connected to the inner ring 20 of each wheel body 3, and each inner ring 20 of both wheel bodies 3 is connected to the main shaft 4 so as to be slidable in the axial direction by, for example, a spline. The rotation of the screw 6 causes the pair of wheels 3 to approach each other or move away from each other. In this embodiment, when the feed screw 6 rotates, the main shaft 4 is also constantly rotating as will be described later, so a thrust bearing 98 is arranged at the connection between the connecting arm 25 and the inner ring 20. The connection is such that it can freely rotate. Further, regarding the movement of the two wheel bodies 3 in the direction in which the two wheel bodies 3 approach each other, the movement of the connecting arm 25 is transmitted to the wheel body 3 via the spring 97, so that, for example, the neck will not be pinched by strong force.

Next, the reduction gear device within the gearbox 27 will be explained. The main speed reduction device is a planetary mechanism 8 that performs differential speed reduction, and this planetary mechanism 8 includes an output shaft 51 to which the rotor 16 of the motor M is attached, a planetary roller 52 whose large diameter portion rolls on the outer surface of the output shaft 51, a first outer ring 53 in which the large diameter portion of the planetary roller 52 is inscribed; a second outer ring 54 in which the small diameter portion of the planetary roller 52 is inscribed;
The retainer 55 is a planetary carrier that supports the planetary roller 52. First outer ring 5
3 and the second outer ring 54 are meshed with a gear 57 and a gear 58 supported by a shaft 56, respectively, and the gear 57
A gear 59 that rotates together with the cylindrical body 62 meshes with a gear 60 that forms a clutch 9 as a torque limiter.
An elliptical gear 63 that rotates together with the main shaft 4 meshes with an elliptical gear 64 fixed to the main shaft 4. Here, the main shaft 4 is connected via a pair of elliptical gears 63 and 64 so that when the amount of protrusion of the wheel body 3 toward the cover sheet 14 increases, the torque increases and the angular speed of rotation is slow. This is to increase the amount of time it takes to bend and press the human body. However, in the lever, if the first outer ring 53 of the planetary mechanism 8 is locked from rotating, differential rotation will occur in the second outer ring 54 due to the difference in diameter between the large diameter part and the small diameter part of the planetary roller 52. This rotation is transmitted to the main shaft 4. Conversely, if the rotation of the second outer ring 54 is prevented, differential rotation is generated in the first outer ring 53 and transmitted to the drive shaft 5.

Next, a power transmission system to the feed screw 6 will be explained. A connection gear 61 for deceleration is engaged with the gear 58 provided between the planetary mechanism 8 and the main shaft 4, and an electromagnetic clutch 10 is further connected to this connection gear 61. gearbox 27
The electromagnetic clutch 10 housed inside has an outer input hub 82 and an inner input hub 81 whose outer peripheral surfaces are shaped like gears and mesh with the connecting gear 61, and an outer output hub 84 and an inner output hub 83 as output members. A feed shaft 8 is provided with an electromagnet 87 consisting of a coil 88, a yoke 89, and a cylindrical iron core 90, and is rotatably supported by a bearing in the gear box 27 and connected to the feed screw 6 at one end.
An inner output hub 83 is fixed to the inner output hub 83, and an outer input hub 82 and an inner input hub 81 are held on the same axial side of the inner output hub 83, and an electromagnet 87 is held on the other side so as to freely rotate on the feed shaft 80. . The inner input hub 81 and the outer input hub 82 are press-fitted and fixed to each other so as to form a double cylindrical shape, and a space for arranging a coil spring 86 is formed between them. In addition, the outer output hub 84 and the inner output hub 8
3 are connected to each other so that the projections at one end of the outer output hub 84 engage with a notch provided in a flange formed at one end of the inner output hub 83 on the electromagnet 87 side, so that they rotate together. . The inner peripheral surface of this outer output hub 84 and the inner peripheral surface of the inner output hub 83
A space for arranging the coil spring 86 is also provided between the outer peripheral surface of the flange and a ring-shaped space located at the front surface of the flange. This space is a space for arranging a ring-shaped clutch 85 made of magnetic material.
The electromagnetic force of the electromagnet 87 causes the clutch shoe 85 to come into contact with the clutch surface on the front surface of the flange. The inner output hub 83 is made of a magnetic material at least at one end with a flange to form a magnetic circuit, and the outer output hub 84 is made of a non-magnetic material. The coil spring 86 has one end locked to the inner input hub 81 and the other end locked to the clutch shoe 85, and the coil spring 86 is configured to fit into the arrangement space between the outer input hub 82 and the inner input hub 81 and the outer output hub. 84 and the arrangement space between the inner output hub 83 and the inner output hub 83 .

In this electromagnetic clutch 10 configured as described above, when the electromagnet 87 is not energized, the clutch shoe 85 is not in contact with the clutch surface, and the coil spring 86 is in contact with the inner peripheral surface of the outer output hub 84. Since the outer peripheral surface of the inner output hub 83 is not in contact with the outer peripheral surface of the inner output hub 83, even if rotational power is transmitted from the connecting gear 61 that meshes with the outer input hub 82 to the input hubs 82, 81,
By simply rotating the coil spring 86 and clutch shoe 85 together with these, the output hubs 84, 8
3 does not rotate and is in a separated state. However, when the electromagnet 87 is excited to bring the clutch shoe 85 into suction contact with the clutch surface, resistance will be generated in the rotation of the clutch shoe 85 to which the coil spring 86 is connected. The diameter becomes smaller or larger depending on the direction of rotation. When the diameter becomes smaller, the coil spring 86 wraps around the outer peripheral surface of the inner output hub 83 and transmits rotational power to the inner output hub 83, and when the diameter becomes larger, it comes into pressure contact with the inner peripheral surface of the outer output hub 84 to transmit rotational power. It is transmitted to the outer output hub 84. The rotation of these output hubs 84 and 83 is taken out from the feed shaft 80 and rotates the feed screw 6.

A member for selectively blocking the rotation of the first outer ring 53 and the second outer ring 54 in the planetary mechanism 8 and switching the power of the motor M to the main shaft 4 and the drive shaft 5 includes a solenoid SOL and a member for switching the power of the motor M to the main shaft 4 and the drive shaft 5. The braking mechanism 7 is thus controlled. This braking mechanism 7 housed in a gearbox 27 is connected to the shaft 2.
9 is inserted through the fixed hub plate 30, a pair of fixed hubs 31 and 35 are fixed to both sides of the fixed hub plate 30 in the axial direction, and the fixed hubs 31 and 35 are supported by the shaft 29 and lined up in the axial direction. A pair of movable hubs 32, 36, a pair of left and right outer circumferential collars 33, 37 and an inner circumferential collar 34, 38 respectively disposed on the outer circumference and inner circumference spanning each movable hub 32, 36 and fixed hub 31, 35, and A total of four coil springs 41, 42, 43, 44 are disposed in contact with the inner and outer peripheral surfaces of the fixed hubs 31, 35 and each of the movable hubs 32, 36, and the fixed hub 3.
1 and 35, the outer circumferential collar 33 and the inner circumferential collar 34 and the outer circumferential collar 37 and the inner circumferential collar 3
8 and a pinion 40 connecting each internal gear part 46 and gear part 47, and both outer peripheral collars 33, 37 are connected to a solenoid SOL disposed in a direction perpendicular to the shaft 29. , one movable hub 32 meshes with the gear 58 to rotate the main shaft 4.
The other movable hub 36 is connected to the drive shaft 5 by meshing with the gear 57 via the shaft 29 passing through each member and the gear 65. Further, among the four coil springs, two coil springs 42 and 44 located on the outer circumferential side and having different winding directions have an inner diameter smaller than the outer diameter of the fixed hubs 31 and 35 and the movable hubs 32 and 36. One end of each is locked to the fixed hub plate 30, each other end is locked to the engaging portion 49 of each outer collar 33, 37,
Two coil springs 41 and 43 located on the inner circumferential side and having different winding directions are connected to the fixed hub 31,
35 and has an outer diameter larger than the inner diameter of the movable hubs 32, 36, one end of each is engaged with the fixed hub plate 30, and each other end is engaged with the engaging portion 49 of each inner peripheral collar 32, 38. The coil springs 41 and 42 are wound in the same direction, and the coil springs 43 and 44 are wound in the same direction.

In this braking mechanism 7 configured as described above, when the solenoid SOL is in the returned state by the return spring 45, the inner peripheral surfaces of the movable hub 36 and the fixed hub 35 connected to the drive shaft 5 and A coil spring 4 is attached to the outer peripheral surface as shown in Fig. 7b.
The movable hub 32 and the fixed hub 31 connected to the main shaft 4 are connected to the seventh As shown in Figure a, the diameter of the outer coil spring 42 is increased by the outer collar 33, and the inner coil spring 41 is further wound in the winding direction by the inner collar 34, and its diameter is reduced. Since the movable hub 32 and the fixed hub 31 are bent and separated from the peripheral surfaces thereof, they are in a state where they are disconnected from each other, and therefore the movable hub 32 connected to the main shaft 4 is in a free state. . In other words, at this time, the rotation of the motor M is decelerated by the differential deceleration by the planetary mechanism 8, and then the main shaft 4
It is transmitted to and solenoid
When the SOL is activated, both the outer collars 33 and 37 rotate in the direction shown by the arrow in FIG. 7, and the inner collars 34 and 38 also rotate in the opposite direction via the pinion 40. Coil springs 41, 42, 4 with fixed hubs 31, 35
In order to reverse the connection by 3 and 44 to the above case, the rotation of the movable hub 32 connected to the main shaft 4 is locked, and the differential deceleration output of the motor M is transferred to the drive shaft 5.
It becomes a state where it is transmitted to. In the control mechanism 7, both movable hubs 32 and 36 are connected to the planetary mechanism 8, the main shaft 4, and the drive shaft 5 at one end in the axial direction, thereby consolidating the arrangement of the braking force transmission system. Also, as is clear from FIG. 7b, in this case, the movable hub 3 is in a free state.
The coil springs 41, 42, 43, 44 that prevent the rotation of the solenoid coils 41, 42, 43, 44 have play in their engagement with the respective collars 33, 34, 37, 38. Since the rotation lock is not released until more than half of the stroke in SOL has elapsed, a situation occurs in which the rotation of both movable hubs 32 and 36 is locked during switching. . This is to prevent the wheel body 3 from rotating or moving up and down due to input from the load side during switching. In addition, when the power is turned off, the state is the same as when the solenoid SOL mentioned above is not energized, that is, the movable hub 3 connected to the drive shaft 5
6 is in a locked state, so the massage mechanism will not descend under its own weight.

However, if an excessive load is applied, such as when the pine surge machine is dropped, the clutch 9 will slip and allow the pine surge mechanism to descend, thereby absorbing this load. In other words, as shown in FIG. 8, the clutch 9 includes the gear 60, which is attached to the cylindrical body 62 so as to be freely rotatable and slidable in the axial direction, and the gear 60, which is fixed to the end of the cylindrical body 62. Consisting of a meshing plate 91 adjacent to one side and equipped with a meshing portion 90 that meshes with the gear 60, and a spring 92 made of two plate springs that biases the gear 60 in the direction in which the gear 60 and the meshing plate 91 mesh. has been done. Normally, the gear 60 that receives the rotation of the motor M, which is the drive source, via the planetary mechanism 8 and the like is engaged with the meshing plate 91, so that the decelerated rotation of the motor M is transmitted to the drive shaft 5. Raise and lower the pine surge mechanism. Furthermore, when the main shaft 4 is not in operation or when the main shaft 4 is rotating, the braking mechanism 7 applies a brake to the rotation of the drive shaft 5, so the pine surge mechanism does not descend under its own weight. .

However, if an excessive vertical impact such as a falling impact is applied, the gear 60 and the engagement plate 91 disengage against the spring 92 despite the braking by the braking mechanism 7, causing the cylindrical body 62 and the drive The shaft 5 rotates. In other words, the pine surge mechanism is lowered. This lowering absorbs the impact and prevents excessive impact from being applied to the pine surge mechanism, and therefore there is no need to make the strength of each member in the pine surge mechanism extremely high. Gear 6 due to impact
Even if the engagement plate 91 and the engagement plate 91 are disengaged, the shape of the teeth of the engagement portion 90 and the spring pressure of the spring 92 automatically restore the engagement.

Here, a motor M and a gearbox 27 are placed at one end of the drive shaft 5, a control box 26 containing a built-in power transformer is placed at the other end of the drive shaft 5, and a wheel body 3 is placed at the other end of the drive shaft 5.
The treatment means block composed of This is to ensure that the pine surge mechanism descends smoothly when a shock is applied without causing so-called twisting of the drive shaft 5, and that shock absorption is ensured.

In addition, in the embodiment shown, the clutch 9 is provided with a release means for manual disconnection to enable manual vertical movement when vertical movement becomes impossible due to some kind of failure. . This is a release plate 93 in contact with the other surface of the spring 92, and is an engagement recess 96 provided in the guide plate 94.
The clutch 9 is released by pulling out the release plate 93, which is provided with an engaging protrusion 95 that engages with the clutch 9. That is, when the release plate 93 is pulled out, the spring 92 retreats and the gear 60 and the engagement plate 91 are removed to eliminate the force pressing the gear 60.
In this state, the cylindrical body 62 and the drive shaft 5 are rotated, that is, the pine surge mechanism is manually moved up and down. When the release plate 93 is inserted and stopped on the guide plate 94, the gear 60 is pressed against the engagement plate 91 by the pressure of the spring 92, and returns to its original state.

[Effects of the Invention] As described above, in the present invention, when an impact such as a drop is applied, the clutch between the drive source and the drive shaft is disengaged, allowing free rotation of the drive shaft, and lowering the treatment means block. Since the shock is absorbed by this lowering, there is no excessive shock applied to the drive source, the treatment means block, or the power transmission member between the drive source and the drive shaft, thus improving the durability. It is not necessary for each member to have an unnecessarily high strength considering impact force,
It is possible to obtain something that is lightweight and strong against impact.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a perspective view of the pine surge mechanism shown above, Fig. 3 is a broken plan view of the above, Fig. 4 is a broken rear view of the same, and Fig. 5 is the same as above. Figures 6a and b are longitudinal and cross-sectional views of the same braking mechanism; Figures 7a and b are cross-sectional views taken from different directions showing the operation of the same braking mechanism; FIG. 8 is a sectional view of the same clutch as above, where 3 is a wheel constituting the treatment means block, 5 is a drive shaft, 9 is a clutch, and M is a motor as a drive source.

Claims (1)

[Claims] 1. A drive shaft is provided which moves the treatment means block up and down along the guide rail by rotating in response to power from a drive source, and the drive source and the drive shaft move up and down together with the treatment means. In a pine serge machine that performs An impact protection device for a pine surge machine characterized by being equipped with a clutch as a torque limiter. 2. The impact protection device for a pine surge machine as set forth in claim 1, wherein the clutch is provided with a release means for manual release. 3. A self-propelled device in which the drive shaft, drive source, and control circuit block are integrally constructed with the treatment means block, and the drive source and control circuit block are located at both ends of the drive shaft, and the treatment means block is located at both ends of the drive shaft. The impact protection device for a pine serge machine according to claim 1, characterized in that the device is disposed in the center.