JP2009257449A - Projection amount variable type linear actuator and chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify structure of a linear actuator. <P>SOLUTION: The projection amount variable type linear actuator has a cylindrical outer tube body 22, an inner tube body 23 inserted into the outer tube body 22, and a support 24 slidably supporting the outer tube body 22. A protrusion part 27 is formed on an inner circumference face of the outer tube body 22 or a guide grove 28 slidably guiding the protrusion part 27 is formed on an outer circumference face of the inner tube body 23. It is composed such that when either one of the inner tube body 23 or the outer tube body 22 is pushed in with respect to the support 24, the protrusion part 27 is engaged with a trailing edge of the guide groove 28, and one or the other of the inner tube body 23 or the outer tube body 22 is projected from the support 24. The guide groove 28 is plurally provided such that positions of trailing edges are different in the outer circumference face of the inner tube body 23, and by selecting any of a plurality of the guide grooves 28, a projection amount of the outer tube body 22 or the inner tube body 23 can be changed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection type variable linear actuator and a chair.

Many chairs and chair-type massage machines used in barbers and beauty salons have a reclining function. A linear actuator is used as a drive source for such a reclining function.
For example, Patent Literature 1 and Patent Literature 2 disclose a linear actuator that rotates a worm gear or a screw portion of an output shaft by a motor and transmits the rotation of the gear or worm gear to the rod to linearly extend and contract the rod. Yes. The linear actuator is provided with a limit switch that operates when the rod reaches a predetermined expansion / contraction amount, and the rod is adjusted to a predetermined expansion / contraction amount by the limit switch.
JP-A-10-318345 JP 2004-36658 A

By the way, in the chair as described above, there is a great demand for adjusting the backrest and the reclining state of the footrest in multiple stages. In a mechanism that adjusts the amount of expansion and contraction of the rod by a limit switch as in Patent Literature 1 and Patent Literature 2, if the reclining state is to be adjusted in multiple stages, a plurality of limit switches and a control unit that controls these are required. Naturally, the linear actuator has a problem that the structure tends to be complicated.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projecting variable linear actuator having a simple structure and a chair using the linear actuator.

In order to achieve the above object, the present invention has taken the following measures.
That is, the projecting variable linear actuator according to the present invention includes a cylindrical outer cylindrical body, a cylindrical inner cylindrical body inserted inside the outer cylindrical body, and the outer cylindrical body in the axial direction. A protrusion that protrudes radially inwardly on the inner peripheral surface of the outer cylindrical body, and the protrusion on the outer peripheral surface of the inner cylindrical body. The guide groove is formed to slidably guide the portion along the longitudinal direction, and when the one of the inner cylinder body and the outer cylinder body is pushed into the support body, the projection portion guides By engaging with the end of the groove, one of the inner cylinder and the outer cylinder protrudes from the support, and the outer peripheral surface of the inner cylinder extends in the circumferential direction. A plurality of guide grooves having different end positions, and selecting one of the plurality of guide grooves allows the outer cylinder body or the inner cylinder body to be selected. Characterized in that it becomes possible to change the amount of protrusion.

The plurality of guide grooves are formed to communicate with each other in the circumferential direction so that the protrusion can move between the plurality of guide grooves by relatively rotating the inner cylinder and the outer cylinder. It is preferable that
The guide groove is preferably formed along the axial direction from the leading edge of the inner cylinder, and the protrusion is formed to be engageable with the edge of the inner cylinder. Is preferred.
Furthermore, positioning means for positioning the rotational position of the inner cylinder relative to the outer cylinder can be provided so that the protrusion is securely fitted in any of the guide grooves.

Furthermore, an operating body that penetrates the inside of the outer cylindrical body in the axial direction and rotates the inner cylindrical body with respect to the outer cylindrical body from the outside of the outer cylindrical body is provided. It is preferable that the inner cylinder body is engaged so as to be relatively movable in the axial direction.
On the other hand, the projecting variable linear actuator according to the present invention includes a cylindrical outer cylindrical body, a cylindrical inner cylindrical body inserted inside the outer cylindrical body, and the outer cylindrical body in the axial direction. A support body that is slidably supported, and either one of the inner cylinder body and the outer cylinder body is pushed into the support body, whereby the other one of the inner cylinder body and the outer cylinder body Is a linear actuator that protrudes from the support body, and an outer peripheral surface of the inner cylindrical body is formed with a protruding portion that protrudes radially outward, and the inner peripheral surface of the outer cylindrical body has the protruding portion Is formed so as to be slidable along the longitudinal direction, and when one of the inner cylinder and the outer cylinder is pushed into the support body, the projection is guided into the guide groove. The other end of the inner cylinder and the outer cylinder protrudes from the support by engaging with the terminal portion of In addition, a plurality of guide grooves having different end positions along the circumferential direction are provided on the inner peripheral surface of the outer cylinder, and by selecting one of the plurality of guide grooves, the outer cylinder Alternatively, the protruding amount of the inner cylinder can be changed.

  And the chair concerning this invention is provided with the seat part, the backrest part provided in the back surface of the seat part, and the footrest part provided in the front surface of the seat part, The said footrest using the above linear actuators And the backrest are tilted with respect to the seat.

  The structure can be simplified by the projecting variable linear actuator or chair according to the present invention.

Hereinafter, a protrusion amount variable type linear actuator (hereinafter simply referred to as a linear actuator 1) and a chair 2 in which the linear actuator 1 is used will be described with reference to the drawings.
The linear actuator 1 of the present invention can be used for the reclining mechanism 3 of various types of chairs 2. Hereinafter, a beauty salon chair using the linear actuator 1 (hereinafter simply referred to as a chair 2) will be described as an example.
As shown in FIG. 1, the chair 2 includes a seat portion 4, a backrest portion 5 erected on the rear end portion of the seat portion 4, and a footrest portion 6 provided on the front end side of the seat portion 4. I have. The seat part 4, the backrest part 5, and the footrest part 6 all have a frame body (not shown) in which a bar is combined, and a cushion material is provided on the side of the frame body facing the person sitting on the chair 2. (Not shown) is provided. The chair 2 includes a reclining mechanism 3, and by operating the reclining mechanism 3, the frame body of the backrest part 5 and the footrest part 6 can be reclined in multiple stages with respect to the frame body of the seat part 4. It is like that.

Hereinafter, the direction indicated by the symbol U in FIG. 1 is the upper direction when the chair 2 and the linear actuator 1 are described, and the direction indicated by D is the lower side. Further, the direction indicated by F in FIG. 1 is referred to as the front, and the direction indicated by B is referred to as the rear. Further, the direction indicated by R in FIG. 1 is referred to as the right direction, and the direction indicated by L is referred to as the left direction. This coincides with the direction seen from the person sitting on the chair 2.
As shown in FIG. 2, the reclining mechanism 3 changes the tilting state (posture) of the backrest part 5 and the footrest part 6 with respect to the seat part 4 between a normal state and a reclining state.

As shown in FIG. 2A, in the chair 2 in the normal state, the backrest part 5 stands up in a substantially vertical direction with respect to the seat part 4 from the rear end side of the seat part 4, and the footrest part 6 is It hangs from the front end side of the seat part 4 in a substantially vertical direction with respect to the seat part 4.
As shown in FIGS. 2B to 2D, in the reclining chair 2, the backrest portion 5 extends in a substantially horizontal direction from the rear end side of the seat portion 4 to the seat portion 4 (in one state). However, the footrest portion 6 can swing by selecting any one of a plurality of swing angles with respect to the seat portion 4 from the front end side of the seat portion 4. That is, the swing angle of the footrest part 6 is substantially horizontal with respect to the seat part 4 as shown in FIG. 2B, or with respect to the seat part 4 as shown in FIG. The angle is one of three states, that is, an angle inclined obliquely downward or an angle substantially perpendicular to the seat portion 4 as shown in FIG. In this way, the reclining mechanism 3 can recline the tilted state of the footrest portion 6 in multiple stages (three states) while the tilted state of the backrest portion 5 can only be reclined to one state. ing.

Details of the chair 2 will be described below. The seat part 4 is supported via the leg part 7, and is arrange | positioned toward the horizontal direction on the upper surface side of the leg part 7. As shown in FIG. A footrest 6 is provided in front of the seat 4 to support the leg of the person sitting on the seat 4 from the calf side, and the back of the person sitting on the seat 4 is supported behind the seat 4. A backrest portion 5 is provided. The backrest portion 5 is swingable around a pivotal support portion 8 provided on the rear end side of the seat portion 4. Further, the footrest part 6 is swingable around a rotating part 9 provided on the front end side of the seat part 4.
As shown in FIGS. 3 and 4, the reclining mechanism 3 is provided on the bottom surface side of the seat 4, and is roughly divided into an electric motor 10, left and right rotating shafts 11 </ b> L and 11 </ b> R, a sliding member 12, a linear actuator. 1 is comprised. The reclining mechanism 3 has a configuration in which the sliding member 12 is moved in the front-rear direction to swing the backrest portion 5 and the linear actuator 1 is expanded and contracted to swing the footrest portion 6 around the rotating portion 9. Yes.

As shown in FIG. 4, the electric motor 10 is provided at the center of the seat portion 4, and has a drive shaft (not shown) extending to the left and right sides, and left and right gear boxes 14 </ b> L covering the drive shaft from the outside. , 14R. The left and right gear boxes 14L and 14R are respectively provided with rotating shafts 11L and 11R in a direction perpendicular to the driving shaft, and worm gears (not shown) provided between the driving shaft and the rotating shafts 11L and 11R. The rotation of the electric motor 10 can be transmitted to the rotation shafts 11L and 11R via the drive shaft.
The rotation shafts 11L and 11R are arranged along the front-rear direction, one axis each in the left and right gear boxes 14L and 14R. The rotary shafts 11L and 11R are rotatably attached to the seat portion 4 and are rotated by the electric motor 10 in different rotation directions. Screw portions 15L and 15R are formed on the peripheral surfaces of the rotary shafts 11L and 11R so that the left and right rotary shafts 11L and 11R have different directions. Moving bodies 16L and 16R that are screwed into the screw portions 15L and 15R are respectively provided on the left and right rotation shafts 11L and 11R on the middle side in the longitudinal direction of the rotation shafts 11L and 11R.

  The moving bodies 16L and 16R are fixed to the middle of the sliding member 12 in the left-right direction, and restrict rotation of the rotary shafts 11L and 11R around the axis. The left moving body 16L is screwed into the left rotating shaft 11L, and moves to the front when the left rotating shaft 11L rotates in the f direction and to the rear when the left rotating shaft 11L rotates in the f 'direction. On the other hand, the right moving body 16R is screwed into the right rotating shaft 11R, and moves forward when the right rotating shaft 11R rotates in the f ′ direction and backward when the right rotating shaft 11R rotates in the f direction. . The moving bodies 16L and 16R convert the force in the rotational direction of the rotating shafts 11L and 11R into the force in the translational direction along the front-rear direction, and move the sliding member 12 in the front-rear direction.

  As shown in FIG. 3, the sliding member 12 is formed in a strip shape along the left-right direction, and is guided by a plurality of guide shafts 17 and is slidably attached in the front-rear direction. . The sliding member 12 has a rear end of the linear actuator 1 fixed to the middle in the left-right direction, and pushes the linear actuator 1 from the rear end side toward the front end side or pulls it out from the front end side toward the rear end side. It can be done. A cover body 18 is attached to the front end of the linear actuator 1, and a connecting rod 19 of the footrest portion 6 is in contact with the front end surface of the cover body 18.

  The sliding member 12 has upright members 20L and 20R attached to the left end and the right end, respectively. The upright members 20L and 20R are formed in a plate shape, and are formed so as to protrude upward. A long hole 21 is formed in the upright members 20L and 20R obliquely upward to the rear, and one end of the frame body of the backrest portion 5 is engaged with the long hole 21 so as to be movable in the hole. Therefore, when the upright members 20L and 20R move back and forth with the movement of the sliding member 12, one end of the backrest portion 5 moves along the long hole 21, and the backrest portion 5 rotates around the pivot portion 8. To do.

The reclining mechanism 3 described above operates as follows. In the reclining mechanism 3 of the chair 2 of the present invention, the swing angle of the footrest part 6 with respect to the seat part 4 can be adjusted in three stages. Here, the footrest part 6 is horizontal with respect to the seat part 4. A description will be given by taking as an example the case of swinging to a position (when the swing angle is maximum).
As shown in FIG. 4A, in the reclining mechanism 3 in the normal state, the sliding member 12 is positioned rearward, and the linear actuator 1 is in a state where the front end does not protrude (degenerate state). When the electric motor 10 is rotated forward, the moving bodies 16L and 16R and the sliding member 12 to which the moving bodies 16L and 16R are attached move forward.

As shown in FIG. 3A, when the sliding member 12 moves forward, the rear end of the linear actuator 1 is pushed forward. In the linear actuator 1, when the rear end is pushed, the front end protrudes forward. Then, the cover body 18 attached to the front end of the linear actuator 1 moves forward according to the protrusion of the linear actuator 1. As a result, the footrest portion 6 rotates (swings) forward about the rotation portion 9 and the footrest portion 6 enters a reclining state.
Further, when the sliding member 12 moves forward, the upright members 20L and 20R also move forward according to the sliding member 12. As a result, as the upright members 20L and 20R move, one end of the backrest portion 5 moves rearward in the long hole 21, the backrest portion 5 rotates about the pivot portion 8, and the backrest portion 5 is in the reclining state. Become. .

On the other hand, as shown in FIG. 4B, in the reclining state, the sliding member 12 is positioned forward, and the linear actuator 1 is in a protruding state with the front end facing forward. When the electric motor 10 is rotated in the reverse direction, the moving bodies 16L and 16R and the sliding member 12 to which the moving bodies 16L and 16R are attached move rearward.
As shown in FIG. 3B, when the sliding member 12 moves rearward, the rear end of the linear actuator 1 is pulled out rearward. In the linear actuator 1, when the rear end is pulled out, the front end moves backward. Then, the cover body 18 attached to the front end of the linear actuator 1 moves backward as the linear actuator 1 moves backward. As a result, the footrest portion 6 rotates (swings) rearward about the rotating portion 9, and the footrest portion 6 returns to the normal state.

When the sliding member 12 moves rearward, the upright members 20L and 20R also move rearward in accordance with the sliding member 12. As a result, one end of the backrest portion 5 moves forward in the long hole 21 in accordance with the movement of the upright members 20L and 20R, and the backrest portion 5 rotates about the pivotal support portion 8 so that the backrest portion 5 is in a normal state. Return.
Next, the linear actuator 1 will be described in detail.
As shown in FIGS. 5 to 8, the linear actuator 1 according to the first embodiment includes a cylindrical outer cylinder 22, a cylindrical inner cylinder 23 inserted inside the outer cylinder 22, an outer And a support 24 that slidably supports the cylindrical body 22 in the axial direction.

As shown in FIG. 5, the support 24 is composed of a left and right pair of a left member 24L and a right member 24R, and is fixed to the seat portion 4 with bolts or the like. Each of the left member 24L and the right member 24R is formed in a shape in which a cylinder is divided in half along the longitudinal direction at the center. In the support 24, when the left member 24L and the right member 24R are connected with screws, a hole 25 is formed between the two along the front-rear direction, and the outer cylindrical body 22 can be removably inserted into the hole 25. It has become.
The outer cylinder 22 is formed in a cylindrical shape that is long in the front-rear direction, and is inserted into the hole 25 of the support 24 so as to be movable in the front-rear direction. The outer peripheral surface of the outer cylinder 22 on the middle side in the front-rear direction has a part of the peripheral wall recessed into a concave shape, and the inner peripheral surface of the concave portion is formed with a protrusion 27 projecting radially inward. It has become.

The inner cylinder 23 is formed in a cylindrical shape having an outer diameter that can be inserted into the outer cylinder 22. A plurality of guide grooves 28 that are long in the front-rear direction are formed on the outer peripheral surface of the inner cylindrical body 23 in the circumferential direction so that the protrusion 27 can be slidably guided along the longitudinal direction. The rear end side of the inner cylindrical body 23 is fixed to the sliding member 12, and the front end side can be inserted toward the inside of the outer cylindrical body 22 according to the sliding member 12.
A through hole 29 is formed in the center of the inner cylinder 23 along the front-rear direction. Further, a pair of engagement grooves 30 are formed on the inner peripheral surface of the through hole 29 from the midway side to the rear end in the front-rear direction with the axis of the through hole 29 sandwiched in the circumferential direction.

  By the way, in the linear actuator 1 of the first embodiment, a plurality of the guide grooves 28 described above are provided on the outer peripheral surface of the inner cylindrical body 23 with different lengths in the longitudinal direction. The inner cylinder 23 is provided with an operating body 31 that penetrates the inside of the outer cylinder 22 and rotates the inner cylinder 23 from the outside of the outer cylinder 22. The operation body 31 has a rear side (a locking pin 37 provided on the rear side) that can be engaged with an engagement groove 30 formed in the inner peripheral surface of the through hole 29 of the inner cylindrical body 23. The cylindrical body 23 can be rotated with respect to the outer cylindrical body 22. Therefore, by rotating the inner cylinder 23 with respect to the outer cylinder 22 by the operating body 31, the projecting portion 27 selects and engages one of the plurality of guide grooves 28, and the outer cylinder with respect to the support 24. The protrusion amount of the body 22 can be changed.

As shown in the development view of FIG. 5, the guide groove 28 is formed on the outer peripheral surface of the inner cylindrical body 23 to a depth that can accommodate the protruding portion 27 of the outer cylindrical body 22 and is linear along the front-rear direction. The protrusion 27 can move in the guide groove 28 in the front-rear direction.
The guide groove 28 includes a first guide groove 32 having a shorter length along the front-rear direction and a second guide groove 33 having a longer length along the front-rear direction than the first guide groove 32 along the circumferential direction. Two types are formed. The first guide groove 32 and the second guide groove 33 are formed as a pair with the axial center in the circumferential direction of the inner cylinder 23, and a pair of protrusions formed on the inner peripheral surface of the outer cylinder 22. 27 can be guided respectively.

The guide groove 28 is provided with a non-grooved portion 34 on the upper and lower outer peripheral surfaces of the inner cylinder 23. A first guide groove 32 and a second guide groove 33 are formed adjacent to the circumferential direction of the non-grooved portion 34. The first guide groove 32 is formed on the outer peripheral surface which is shifted by approximately 60 ° counterclockwise from the non-grooved portion 34 when the inner cylindrical body 23 is viewed from the front. The second guide groove 33 is formed on the outer peripheral surface that is shifted by approximately 60 ° in the clockwise direction from the non-grooved portion 34 when the inner cylindrical body 23 is viewed from the front.
Each of the first guide groove 32 and the second guide groove 33 is formed in an open shape from the front end of the inner cylinder 23 toward the front, and the protrusion 27 is inserted into the guide groove 28 from the front of the inner cylinder 23. You can guide smoothly. Further, both the first guide groove 32 and the second guide groove 33 are formed so that the groove ends on the middle side in the front-rear direction of the inner cylindrical body 23.

The first guide groove 32 and the second guide groove 33 differ in the position of the end portion of the groove in the front-rear direction. Since the second guide groove 33 is longer in the front-rear direction than the first guide groove 32, the terminal portion thereof is located behind the second guide groove 33. Therefore, the second guide groove 33 can guide the protrusion 27 to the rear from the first guide groove 32, and engages with the protrusion 27 behind the first guide groove 32.
The front end surface of the non-grooved portion 34 is flush with the front end surface of the inner cylindrical body 23, and the protrusion 27 is engaged with the front end surface. The front end surface of the non-grooved portion 34 is located in front of the end portions of the first guide groove 32 and the second guide groove 33 and engages with the protrusion 27 in front of the first guide groove 32 and the second guide groove 33. .

  As described above, the end portion of the first guide groove 32, the end portion of the second guide groove 33, and the front end surface of the endless portion 34 are provided at different positions in the front-rear direction. Then, by rotating the inner cylindrical body 23 and the outer cylindrical body 22 relative to each other, the protrusion 27 can be any one of the terminal end portion of the first guide groove 32, the terminal end portion of the second guide groove 33, or the front end surface of the endless portion 34. Select one of them to engage at different positions in the front-rear direction. Therefore, when the inner cylinder body 23 and the outer cylinder body 22 are rotated relative to each other, the portion where the projection 27 is engaged is the terminal portion of the first guide groove 32, the terminal portion of the second guide groove 33, and the endless portion 34. It switches in the front end face of. And the position where the inner cylinder body 23 engages with the outer cylinder body 22 changes in the front-rear direction, and the protruding amount of the outer cylinder body 22 with respect to the support body 24 is switched in three stages.

That is, the protrusion amount of the outer cylindrical body 22 with respect to the support 24 is maximized when the protrusion 27 is engaged with the front end surface of the endless portion 34, and the protrusion 27 is engaged with the terminal portion of the second guide groove 33. Sometimes the minimum. And when the protrusion part 27 engages with the terminal part of the 1st guide groove 32, it will protrude to the middle at the time of a maximum protrusion.
As shown in FIG. 6, the operation body 31 includes an operation rod portion 35 that penetrates the inside of the outer cylindrical body 22 in the front-rear direction, an operation knob 36 provided on the front end side of the operation rod portion 35, and the operation rod portion 35. And a locking pin 37 provided on the rear end side.

A cover body 18 is attached to the front end of the outer cylindrical body 22, and the operation rod portion 35 penetrates the cover body 18 in the front-rear direction. An operation knob 36 is provided on the operation bar 35 in front of the cover body 18, and the operation bar 35 can be rotated by rotating the operation knob 36.
A locking pin 37 is provided on the rear end side of the operation rod portion 35 so as to penetrate the operation rod portion 35 in the radial direction. The locking pin 37 is provided so as to protrude from the operation rod portion 35 toward the radially outer side, and the protruding end thereof enters the engaging groove 30 formed on the inner peripheral surface of the inner cylindrical body 23. Yes. Therefore, the operating body 31 rotates integrally with the inner cylinder body 23 by engaging the locking pin 37 with the engaging groove 30.

The engaging groove 30 is linearly formed in the front-rear direction, and the locking pin 37 can move in the front-rear direction in the engaging groove 30. Therefore, even if the locking pin 37 is engaged with the engaging groove 30, the inner cylinder 23 and the outer cylinder 22 can be relatively moved along the front-rear direction, and the operating body 31 is connected to the inner cylinder 23 and the outer cylinder. The relative movement with the body 22 is not disturbed.
Positioning means 38 is provided between the cover body 18 and the operating rod portion 35 to position the rotational position of the inner cylinder body 23 relative to the outer cylinder body 22. The positioning means 38 includes a guide hole 39, a sphere 40, and an elastic member 41 provided on the cover body 18 side, and a plurality of positioning recesses 42 provided on the operation rod portion 35 side.

The guide hole 39 is formed in the cover body 18 in a direction perpendicular to the axis of the operation rod portion 35. Inside the guide hole 39, a sphere 40 and an elastic member 41 that urges the sphere 40 in the axial direction of the operation rod portion 35 are provided. A plurality of positioning recesses 42 that engage with the sphere 40 are provided on the outer peripheral surface of the operation rod portion 35 in the circumferential direction.
The positioning means 38 is urged by the elastic member 41 in the axial direction of the operating rod portion 35, and the sphere 40 engages with any of the positioning recesses 42 formed in the circumferential direction on the outer peripheral surface of the operating rod portion 35. By doing so, the rotation position of the inner cylinder body 23 with respect to the outer cylinder body 22 can be positioned. By providing such positioning means 38, the inner cylinder body 23 and the outer cylinder body 22 can be relatively rotated to a predetermined rotation position, and the protrusion 27 is reliably guided to any one of the guide grooves 28. It becomes possible to do.

Next, the operation of the linear actuator 1 will be described with reference to FIGS.
First, the case where the protrusion 27 is engaged with the non-grooved portion 34 without rotating the operation knob 36 will be described.
As shown in FIG. 6A, the reclining mechanism 3 is operated to move the sliding member 12 toward the front end side. In this way, the inner cylindrical body 23 moves from the rear end side toward the front end side according to the sliding member 12. At this time, between the outer cylindrical body 22 and the inner cylindrical body 23, the protrusion 27 engages with the non-grooved portion 34 of the inner cylindrical body 23, and the outer cylindrical body 22 faces the front end side together with the inner cylindrical body 23. Move.

As shown in FIG. 6B, when the sliding member 12 moves to the middle part in the front-rear direction, the outer cylinder 22 protrudes to the front end side by the amount that the inner cylinder 23 has moved to the front end side. Then, the cover body 18 attached to the front end of the outer cylindrical body 22 pushes the footrest portion 6 forward, and the footrest portion 6 swings in a direction of jumping up around the rotating portion 9.
As shown in FIG. 6C, when the sliding member 12 moves to the front end side, the outer cylindrical body 22 protrudes to the front end side with the maximum protrusion amount. Then, the footrest portion 6 is pivoted by the cover body 18 of the outer cylindrical body 22 in a direction in which the footrest portion 6 jumps up to a position substantially horizontal to the seat portion 4 with the pivoting portion 9 as the center.

Next, the operation knob 36 is rotated clockwise as viewed from the front, and the protrusion 27 is engaged with the first guide groove 32. In this way, the operation rod portion 35 and the locking pin 37 rotate according to the operation knob 36, and the inner cylinder 23 rotates clockwise with respect to the outer cylinder 22. Then, when the protrusion 27 rotates to the rotation position where it engages with the first guide groove 32, the rotation position is positioned by the positioning means 38.
As shown in FIG. 7A, when the reclining mechanism 3 is operated to move the sliding member 12 from the rear end side to the front end side, the inner cylinder 23 is aligned with the sliding member 12 from the rear end side. Move toward the front end. At this time, the protrusion 27 is in the first guide groove 32, and the locking pin 37 is also in the engagement groove 30. Therefore, the outer cylindrical body 22 does not move according to the inner cylindrical body 23 and the sliding member 12, and the footrest portion 6 does not swing.

As shown in FIG. 7B, when the sliding member 12 moves to the middle part in the front-rear direction, the protrusion 27 reaches the terminal end of the first guide groove 32 and the protrusion 27 engages with the terminal end. . As a result, the outer cylinder 22 starts moving forward integrally with the inner cylinder 23.
As shown in FIG. 7C, when the sliding member 12 moves to the front end side, it slides between when the protrusion 27 is engaged with the terminal end of the first guide groove 32 and until the movement is completed. The outer cylinder 22 protrudes toward the front end side by the distance that the member 12 has moved. However, since the outer cylinder 22 does not move from the beginning in accordance with the inner cylinder 23, the protruding amount of the outer cylinder 22 is smaller than the maximum protruding amount. As a result, the footrest portion 6 swings to a swing angle smaller than that shown in FIG. 6C (a position tilted obliquely downward with respect to the horizontal direction), and changes to a tilt state intermediate between the normal state and the reclining state.

On the other hand, the operation knob 36 is rotated counterclockwise when viewed from the front, and the protrusion 27 is engaged with the second guide groove 33. In this way, the operation rod portion 35 and the locking pin 37 rotate according to the operation knob 36, and the inner cylinder 23 rotates counterclockwise with respect to the outer cylinder 22. Then, when the protrusion 27 rotates to the rotation position where it engages with the second guide groove 33, the rotation position is positioned by the positioning means 38.
As shown in FIG. 8A, when the reclining mechanism 3 is operated and the sliding member 12 is moved from the rear end side to the front end side, the inner cylinder 23 is aligned with the sliding member 12 from the rear end side. Move toward the front end. At this time, the protrusion 27 is in the first guide groove 32, and the locking pin 37 is also in the engagement groove 30. Therefore, the outer cylindrical body 22 does not move according to the inner cylindrical body 23 and the sliding member 12, and the footrest portion 6 does not swing.

As shown in FIG. 8B, the second guide groove 33 is formed longer in the front-rear direction than the first guide groove 32 even when the sliding member 12 moves to the middle part in the front-rear direction. The part 27 is still in the second guide groove 33. Therefore, the outer cylindrical body 22 does not move according to the inner cylindrical body 23 and the sliding member 12, and the footrest portion 6 does not swing.
As shown in FIG. 8C, even when the sliding member 12 moves to the front end side, the protrusion 27 is still in the second guide groove 33, and the outer cylinder 22 is moved to the inner cylinder 23 or the sliding member. It does not move according to the moving member 12. Therefore, when the protrusion 27 is engaged with the second guide groove 33, the footrest 6 does not swing at all even if the sliding member 12 is moved in the front-rear direction.

The linear actuator 1 according to the present invention includes a protrusion 27 formed in a radially inward projecting shape on the inner peripheral surface of the outer cylindrical body 22, and the protrusion 27 is slid along the longitudinal direction on the outer peripheral surface of the inner cylindrical body 23. A guide groove 28 formed so as to be movable, and the protrusion 27 is engaged with the terminal end of the guide groove 28 so that either the inner cylinder 23 or the outer cylinder 22 is supported. The structure protrudes from the body 24.
Further, in the linear actuator 1 of the present invention, a plurality of guide grooves 28 having different end positions along the circumferential direction are provided on the outer peripheral surface of the inner cylindrical body 23, and the protrusions 27 are formed in any of the plurality of guide grooves 28. Is engaged, the amount of protrusion of the outer cylindrical body 22 relative to the support 24 can be adjusted in multiple stages.

Therefore, the linear actuator 1 has a simple structure in which the outer cylindrical body 22 and the inner cylindrical body 23 are combined, and it is not necessary to use a plurality of limit switches as in the conventional linear actuator 1. As a result, in the linear actuator 1 of the present invention, the number of parts can be reduced and the weight can be reduced accordingly. In addition, since the number of parts can be reduced, the manufacturing cost can be reduced and the price can be reduced.
The present invention is not limited to the above-described embodiments, and the shape, structure, material, combination, and the like of each member can be appropriately changed without changing the essence of the invention.

In the above embodiment, the protrusion 27 is formed on the inner peripheral surface of the outer cylindrical body 22, and the guide groove 28 that engages with the protrusion 27 is formed on the outer peripheral surface of the inner cylindrical body 23. However, the protrusion 27 can be formed on the outer peripheral surface of the inner cylindrical body 23, and the guide groove 28 can be formed on the inner peripheral surface of the outer cylindrical body 22.
That is, the protrusion 27 may be provided on either the inner cylinder 23 or the outer cylinder 22, and the guide groove 28 may be provided on the other of the inner cylinder 23 and the outer cylinder 22. Whether the projection 27 or the guide groove 28 is provided in the inner cylinder 23 or the outer cylinder 22 can be appropriately changed according to the formation of the projection 27 and the guide groove 28 or ease of attachment. In either case, the same effect can be obtained.

In the said embodiment, the chair of the beauty salon was illustrated as the chair 2 in which the linear actuator 1 was provided. However, the linear actuator 1 of the present invention can be used for any chair 2 as long as the chair 2 has a reclining function, and can also be used for a barber chair or a chair type massage machine.
In the above embodiment, the linear actuator 1 when the footrest part 6 is reclined with respect to the seat part 4 is exemplified. However, the linear actuator 1 according to the present invention is used in the reclining mechanism 3 for reclining the backrest part 5 with respect to the seat part 4. Can also be used. Further, in the reclining mechanism 3 in which both the backrest portion 5 and the footrest portion 6 recline in a plurality of tilted states with respect to the seat portion 4, the linear actuator 1 is connected to the reclining mechanism of the footrest portion 6 and the footrest portion 6. It can also be used for both reclining mechanisms.

In the above embodiment, two types of guide grooves 28 are provided on the outer peripheral surface of the inner cylinder 23 with different lengths. However, the number of the guide grooves 28 is not limited to two. For example, the guide groove 28 can be only one type or three or more types. Specifically, the reclining is such that three types of guide grooves 28 and no-groove portions 34 are provided on the outer peripheral surface of the inner cylindrical body 23 at an angle of approximately 45 °, and the footrest portion 6 and the backrest portion 5 are reclined into a four-stage tilted state. The mechanism 3 can also be used.
Further, the length of the guide groove 28 can be appropriately changed according to the reclining angle (swinging angle) of the backrest 5 and the footrest 6. For example, when it is desired to make the reclining angle (swing angle) of the backrest part 5 or the footrest part 6 shallow, the guide groove 28 may be shortened, and when it is desired to be deepened, it may be lengthened.

  In the above-described embodiment, an example in which the inner cylinder 23 is rotated with respect to the outer cylinder 22 by the operating body 31 is illustrated. However, the means for relatively rotating the inner cylinder body 23 and the outer cylinder body 22 is not limited to the operation body 31. For example, the inner cylinder 23 can be provided so as not to rotate with respect to the support 24, and the outer cylinder 22 can be rotated to relatively rotate the inner cylinder 23 and the outer cylinder 22. .

It is a perspective view of a chair provided with the linear actuator of the present invention. It is explanatory drawing which shows the change of the reclining attitude | position of a chair. It is a bottom view of the seat part of a chair. It is a side view of the seat part of a chair, a backrest part, and a footrest part. It is a decomposition explanatory view of the linear actuator of a 1st embodiment. It is explanatory drawing of a linear actuator in the case of engaging a projection part with a non-groove part. It is explanatory drawing of a linear actuator in the case of engaging a projection part with a 1st guide groove. It is explanatory drawing of a linear actuator in the case of engaging a projection part with a 2nd guide groove.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear actuator 2 Chair 3 Reclining mechanism 4 Seat part 5 Backrest part 6 Footrest part 7 Leg part 8 Pivoting part 9 Rotating part 10 Electric motor 11 Rotating shaft 12 Sliding member 13 Drive shaft 14 Gear box 15 Screw part 16 Moving body 17 Guide shaft 18 Cover body 19 Connecting rod 20 Standing member 21 Long hole 22 Outer cylinder body 23 Inner cylinder body 24 Support body 24L Left member of support body 24R Right member of support body 25 Hole portion 27 Projection portion 28 Guide groove 29 Through hole 30 Engaging groove 31 Operating body 32 First guide groove 33 Second guide groove 34 Non-grooved portion 35 Operating rod portion 36 Operation knob 37 Locking pin 38 Positioning means 39 Guide hole 40 Sphere 41 Elastic member 42 Positioning recess

Claims (9)

A cylindrical outer cylinder, a cylindrical inner cylinder inserted inside the outer cylinder, and a support that supports the outer cylinder slidably in the axial direction;
On the inner peripheral surface of the outer cylindrical body, a protrusion that protrudes in the radially inward direction is formed,
A guide groove that slidably guides the protrusion along the longitudinal direction is formed on the outer peripheral surface of the inner cylindrical body,
When either one of the inner cylinder body and the outer cylinder body is pushed into the support body, the projection portion engages with the terminal end portion of the guide groove, so that the inner cylinder body and the outer cylinder body Either one of the other protrudes from the support,
On the outer peripheral surface of the inner cylindrical body, a plurality of guide grooves whose end portions are different along the circumferential direction are provided, and by selecting one of the plurality of guide grooves, the outer cylindrical body or the inner cylinder A protruding amount variable type linear actuator characterized in that the protruding amount of the body can be changed.   The plurality of guide grooves are formed to communicate with each other in the circumferential direction so that the protrusion can move between the plurality of guide grooves by relatively rotating the inner cylinder and the outer cylinder. The protruding amount variable type linear actuator according to claim 1, wherein:   The said guide groove is formed along the axial direction from the front-end edge of the said inner cylinder so that the said projection part can be guided in a guide groove from the front end side of an inner cylinder. The protrusion amount variable type linear actuator according to 1 or 2.   The protrusion amount variable type linear actuator according to any one of claims 1 to 3, wherein the protrusion portion is formed so as to be engageable with an end edge of the inner cylindrical body.   The positioning means for positioning the rotational position of the inner cylinder body with respect to the outer cylinder body is provided so that the projection portion fits securely in any of the guide grooves. The protrusion amount variable type linear actuator according to any one of the above. An operating body is provided that penetrates the inside of the outer cylinder in the axial direction and rotates the inner cylinder relative to the outer cylinder from the outside of the outer cylinder,
The projecting amount variable type linear actuator according to claim 1, wherein the operating body is engaged with the inner cylinder so as to be relatively movable in an axial direction. A cylindrical outer cylinder, a cylindrical inner cylinder inserted inside the outer cylinder, and a support that slidably supports the outer cylinder in the axial direction. A linear actuator in which either one of the inner cylinder and the outer cylinder projects from the support by pushing one of the cylinder and the outer cylinder into the support,
On the outer peripheral surface of the inner cylindrical body, a protrusion that protrudes radially outward is formed,
On the inner peripheral surface of the outer cylindrical body, a guide groove is formed in which the protrusion moves slidably along the longitudinal direction.
When either one of the inner cylinder body and the outer cylinder body is pushed into the support body, the projection portion engages with the terminal end portion of the guide groove, so that the inner cylinder body and the outer cylinder body Either one of the other protrudes from the support,
A plurality of guide grooves whose end portions are different along the circumferential direction are provided on the inner peripheral surface of the outer cylinder, and by selecting one of the plurality of guide grooves, the outer cylinder or the inner cylinder A protruding amount variable type linear actuator characterized in that the protruding amount of the cylindrical body can be changed. A seat, a backrest provided on the back of the seat, and a footrest provided on the front of the seat;
A chair characterized in that the footrest part is tilted with respect to the seat part using the linear actuator with variable projection amount according to any one of claims 1 to 7. A seat, a backrest provided on the back of the seat, and a footrest provided on the front of the seat;
A chair, wherein the backrest portion is tilted with respect to the seat portion by using the protruding amount variable type linear actuator according to any one of claims 1 to 7.

Images