JP6403274B2 - Standing assistance chair and standing assistance device used therefor - Google Patents

Description

The present invention relates to a standing auxiliary chair provided for use by a person with weak legs and a standing assistance device used therefor .

  Standing assistance chairs have been proposed for those who are able to walk on their own but feel difficult or burdensome to sit down on their own chairs. In general, the standing-up auxiliary chair is designed to tilt forward while the seat is raised when standing up, and to return and rotate while sitting down. The means for moving the seat includes a motor, a gas spring, and a coil spring. Etc. are used.

As an example, Patent Document 1 discloses a structure using a torsion coil spring (kick spring) as means for moving a seat. In this Patent Document 1, the seat is connected to the leg portion so as to tilt while being raised and lowered by an X-type link mechanism, and by urging the link mechanism with a spring, Is supported. And in patent document 1, the lever which switches between the state which the urging | biasing force of a spring acts on a link mechanism, and the state which does not act is provided in the vicinity part of the armrest.

JP 09-168565 A

  When the spring means is used as the urging means for the seat as in Patent Document 1, there is an advantage that the weight can be reduced and the cost can be significantly suppressed as compared with the case where a power actuator such as a motor is used. In addition, the mechanism can be made compact. In addition, since no power source is required, it can be installed anywhere, and the trouble of charging can be eliminated.

  However, Patent Document 1 has several problems. For example, since the spring is only wound around the rotation shaft of the link constituting the link mechanism, the relationship between the rotation angle of the seat and the urging force is the same between the standing motion support and the seat motion support, For this reason, when the spring force of the spring is set to a strength that can support the standing motion firmly, it is difficult for the seat to descend when seated, and conversely, the spring biasing force has a strength that allows the seat to move smoothly. When set, there is a problem that it is difficult to set the support force for the standing motion and the support force for the seating motion to appropriate strengths such that the standing motion cannot be accurately supported.

  In addition, elastic force is stored in the spring when a person is seated. However, since the spring is only wound around the rotating shaft of the link mechanism, the spring force (biasing force) is the highest when the seat is fully lowered. It is large and weakest when the seat is fully raised, so if you set it to a force that can properly stand up, the seat will be pushed up too much when you stand up, and it will be difficult to lower the seat when you are seated There was also a fear.

  In addition, the spring force is strongest when the seat is fully lowered, so that the spring force is locked against the seat so that the seat does not rise when the user floats slightly. As well as a lever that unlocks the structure, which not only complicates the structure, but if you accidentally operate the lever while seated, a strong biasing force acts on the seat and the body becomes unstable. There was a risk of becoming.

  Now, in patent document 1, a seat raises / lowers almost without changing the front-back position. On the other hand, the standing chair is often used as a set with a table such as a dining table. However, if the body is in the front-rear position where it is easy to eat, there is not much space between the body and the table. If the seat is configured to move up and down without changing the front-rear position, there is a problem that the body tends to hit the front end of the table when a person stands up.

  This invention makes it a subject to improve such a present condition.

The present invention includes many configurations, and typical configurations are specified in each claim. Among the first aspect of the present invention are those according to the orthostatic booster seat, standing auxiliary chair,
“ A seat attached to the leg to be lifted or tilted back and forth, or lifted and tilted back and forth, and spring means for supporting the person's standing motion and sitting motion by urging the seat, and the person standing up from the seated state Reaction force switching means that automatically changes the urging force of the spring means against the seat at the time of the standing motion support that shifts to and the seating motion support at which the person transitions from the standing state to the seating state ,
At the time of standing motion support, the urging force of the spring means against the seat increases as a person transitions from the seated state to the standing state, while the maximum biasing force of the spring means at the time of the seating motion support is The configuration is smaller than the maximum urging force at the time of standing up support,
The biasing force of the spring means against the seat at the time of the seating movement support is set by the guide means so as to gradually increase from the start of the seating movement and greatly decrease at the end. ''
It is the composition.

The invention of claim 2 also relates to a standing auxiliary chair,
“A seat attached to the leg to be lifted or tilted back and forth, or lifted and tilted back and forth, and spring means for supporting the person's standing motion and sitting motion by urging the seat, and the person standing up from the seated state Reaction force switching means that automatically changes the urging force of the spring means against the seat at the time of the standing motion support that shifts to and the seating motion support at which the person transitions from the standing state to the seating state,
The seat is supported by a leg portion so as to move up and down at least by a link mechanism having a plurality of links. By connecting one end of the spring means to the link mechanism, a person's standing motion and seating motion can be prevented. Supported,
Further, by changing the position of the connecting portion between the spring means and the link mechanism between the standing motion support in which the seat is raised and the seating motion support in which the seat is lowered, It has a different urging force from the time of support,
The biasing force of the spring means against the seat at the time of the seating movement support is set by the guide means so as to gradually increase from the start of the seating movement and greatly decrease at the end. ''
It is the composition.

The invention of claim 3 is the invention of claim 2 ,
"One end of the spring means is connected to the link mechanism so as to move relative to the vertical direction, and the support portion is at a high position during the support of the standing motion,
When the link mechanism is completely rotated in the standing support direction, the connecting portion of the spring means with respect to the link mechanism is lowered by the weight of the spring means or the biasing means. The biasing force is lower than the final biasing force at the time of standing support,
And, at the time of the seating movement support, the downward movement of the connecting portion of the spring means with respect to the link mechanism is guided by the guide body in the inclined posture in the side view, so that the urging force at the time of the seating movement support gradually increases. `` It is set to change so as to greatly decrease at the terminal part. ''
It is the composition.

  As a specific configuration for moving the connecting portion between the spring means and the link mechanism, for example, a longitudinally elongated long hole is formed in one, and the other is a guide pin (guide shaft) that fits into the long hole. Can be provided. Alternatively, either one may be provided with a vertically long guide body, and the other may be provided with a slider supported by the guide body.

The invention of claim 4 also relates to a standing assistance chair,
“ A seat attached to the leg to be lifted or tilted back and forth, or lifted and tilted back and forth, and spring means for supporting the person's standing motion and sitting motion by urging the seat, and the person standing up from the seated state Reaction force switching means that automatically changes the urging force of the spring means against the seat at the time of the standing motion support that shifts to and the seating motion support at which the person transitions from the standing state to the seating state,
The seat is set to change its posture and position so that it rises while tilting forward in side view while retreating as a whole when supporting the standing motion. ''
It is the composition.

The invention of claim 5 relates to a “stand-up assisting device that is arranged between a leg portion and a seat of a chair and supports the seat so as to move up and down, tilt forward and backward, or lift and tilt forward and backward.” In response to
"Spring means for urging the seat to support a person's standing motion and sitting motion, and a seating motion support when a person transitions from a standing state to a standing state and when a person transitions from a standing state to a sitting state. Reaction force switching means that automatically changes the urging force of the spring means against the seat over time,
At the time of standing motion support, the urging force of the spring means against the seat increases as a person transitions from the seated state to the standing state, while the maximum biasing force of the spring means at the time of the seating motion support is It is smaller than the maximum urging force at the time of standing up support,
Furthermore, configuration the urging force of the spring means for the seat at the seating dynamic support, the guide means, that gradually is set to change to decrease significantly in increased final "from the start of the seating motion It has become.

The invention of claim 6 also relates to a “stand-up assisting device that is arranged between a leg portion and a seat of a chair and supports the seat so as to move up and down or tilt forward and backward or tilt and back and forth.” In response to
" A link mechanism disposed between the seat and the leg so that the seat moves up and down at least; a spring means that urges the seat to support a person's standing motion and seating motion; A reaction force switching means that automatically changes the urging force of the spring means against the seat between the standing motion support transitioning from the standing position to the standing position and the seating motion support transitioning from the standing position to the seating state. ,
The link mechanism includes a plurality of links, and by connecting one end of the spring means to the link mechanism, a standing motion and a sitting motion of a person are supported,
Further, by changing the position of the connecting portion between the spring means and the link mechanism between the standing motion support in which the seat is raised and the seating motion support in which the seat is lowered, It has a different urging force from the time of support,
The biasing force of the spring means against the seat at the time of the seating movement support is set by the guide means so as to gradually increase from the start of the seating movement and greatly decrease at the end. ''
It is the composition.

The invention of claim 7 also relates to a “ stand-up assisting device that is arranged between a leg portion and a seat of a chair and supports the seat so as to move up and down, tilt forward and backward, or lift and tilt forward and backward. ” In response to
"Spring means for urging the seat to support a person's standing motion and sitting motion, and a seating motion support when a person transitions from a standing state to a standing state and when a person transitions from a standing state to a sitting state. Reaction force switching means that automatically changes the urging force of the spring means against the seat over time,
At the time of supporting the standing motion, the seat and the position are set so that the posture and the position are changed so that the seat moves backward while tilting forward in a side view. ''
It is the composition.

In the present invention, the urging force for the seat can be changed between the standing motion support and the seat motion support while using the spring means, so that the seat can be biased with an appropriate strength when standing and when sitting. Accordingly, while retaining the advantage of simplifying the structure by using a spring means as the urging means, people that sit in Turkey and or chair rising from a chair, can be carried out smoothly and safely.

While the movement of a person standing up from a chair stretches the body against gravity, the movement of sitting is a movement of lowering the waist according to gravity. Urging force) is often required. Therefore, by adopting the configuration of claims 1 and 5 , the body can be appropriately supported by both the standing motion and the seating motion.

Further, in claims 1 and 5 , the urging force at the time of standing up is gradually increased, which means that the urging force is the smallest when a person has sat down. However, in this way, if the biasing force is the smallest with the person sitting down, even if the biasing force of the spring means is always applied to the seat, the person receives a feeling of pushing up from the seat, The seat will not be lifted just by lifting a little. Therefore, the lever means is not required and the structure can be simplified, and the troublesome operation of the lever can be eliminated.

How to guide the movement of the seat to support the standing dynamic and sitting movement of a person, and, a method of changing the biasing force by the time of seating movement and orthostatic dynamic can variously embodied, according to claim 2, 6 Thus, if a link mechanism is employed as a method for guiding the movement of the seat, the seat can be reliably moved with a simple configuration. Moreover, if the structure which moves the connection part of a spring means and a link mechanism as an urging | biasing force changing means is employ | adopted, the change of urging | biasing force is realizable with a simple structure. In particular, when a combination of a long hole and a guide pin is employed, the structure is further simplified.

  Now, when a person sits on a standing chair, both hands are put on the armrests and the upper body is lowered, but both hands bend as the upper body descends, so as the upper body descends, the legs and both hands The burden on is increased. Therefore, when the urging force of the spring means is constant or gradually decreases during the seating movement, the body may drop sharply with the stone.

On the other hand, if the structure of Claim 1 and 5 is employ | adopted, since resistance with respect to a body will increase as a body descend | falls, a body will prevent falling with a stone at the time of a seating movement, and it is safe and smooth. Can sit on. In this case, since the urging force is reduced at the end of the seating movement, the seat can be lowered completely without any problem.

If the structure of Claim 2 and 6 is employ | adopted, since the urging | biasing force with respect to a seat changes by the dead weight of a spring means or an urging | biasing means at the time of a standing motion support and a seating motion support, a structure can be simplified. In particular, when the spring means is switched by its own weight, the structure is further simplified and the loss of spring force can be prevented. In addition, since the urging force is controlled forcibly by the guide body at the time of sitting support, the urging force can be controlled reliably, and the guide body has a simple structure, which also reduces the cost. Can contribute.

In the inventions of claims 4 and 7, the seat moves backward when a person stands up, so that even the standing assistance chair used as a set with the table is disturbed by the table from the state where the meal can be properly served. And can stand up stably. The transition from leaving the seat to walking may be performed after the chair is pulled, or the body may be shifted to the side of the chair without changing the front-rear position of the chair.

Further, in the fourth and seventh aspects , since the seat is lifted and retracted in a state where no person is seated, when sitting on the standing upright chair arranged in a set with the table, the body is disturbed by the seat. Can be moved laterally between the seat and the table. For this reason, the seating movement to the chair previously installed in the predetermined position with respect to the table can also be performed smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole perspective view of the standing-up auxiliary chair which concerns on embodiment, (A) is a figure of the state which the seat fell down, (B) is a figure of the state which the seat raised up. (A) is a partially omitted perspective view seen from below with the seat fully lowered, and (B) is a partially omitted perspective view seen from behind with the seat raised. It is a vertical side view in the state where a seat was made to raise. It is a partial separation perspective view of a mechanism part. (A) is a perspective view of the mechanism part in the sitting state, (B) is a side view of the mechanism part in the sitting state, and (C) is a side view of the mechanism part in the non-sitting state. (A) is a perspective view of the mechanism part in the middle of standing motion, (B) is a perspective view of the mechanism part at the time of completion of standing motion. (A) is a perspective view of the mechanism part from the end of the standing motion to the seating motion, and (B) is a perspective view during the seating motion. It is a schematic diagram in a vertical side view for explaining the movement of the mechanism unit at the end of the standing motion and thereafter. (A) is a graph which shows the relationship between the raising angle (or seat height) of a link, and the change of the urging | biasing force of a spring means, (B) is a side view in the middle of seating movement.

(1). Outline of Standing Auxiliary Chair Next, an embodiment of the present invention will be described based on the drawings. First, an outline of a standing auxiliary chair (hereinafter simply referred to as “chair”) will be described with reference to FIGS. In the following explanation, the front / rear / left / right wording is used to specify the direction, which is based on the direction of the person who normally sits on the chair.

  The chair includes a leg 1, a seat 2, and a backrest 3. The leg portion 1 has four legs 4, front and rear longitudinal side crosspieces 5 and left and right longitudinal front and rear side crosspieces 6 and 7 connected to the midway height. The armrests 8 are supported by the upper ends of the front and rear legs 4 so as to extend above the crosspieces 5 to 7. The front horizontal beam 6 and the rear horizontal beam 8 are connected by a longitudinal reinforcing beam 9. Although the backrest 3 is integrally provided at the rear end of the armrest 8, it is also possible to form the back leg 4 in a backward tilting posture and provide the backrest 3 at the upper end thereof. Further, the armrest 8 can be attached to the side crosspiece 5.

  The front horizontal beam 6 is connected to the side horizontal beam 5. Therefore, the front crosspiece 6 is located behind the front foot 4 by a certain size. For this reason, the chair user's foot does not hit the front horizontal rail 6. As shown by a one-dot chain line in FIG. In this case, the caster 10 does not roll easily when a person is seated, but may be set so that it can roll when the person floats or leaves the chair.

In the embodiment, the leg portion 1, the seat 2, and the backrest 3 are made of wood, but any material can be set arbitrarily. For example, the seat 2 and the backrest 3 can have a structure in which a cushion is stretched on a resin shell. Legs 1, metal pipe made or resin, or may be made of aluminum die-casting. The leg portion does not need to be a four-leg type, and may have a form in which 4 to 5 branch legs extend radially from the lower end of the leg column. It is also possible to make the seat 2 horizontal.

The seat 2 is supported by a mechanism unit (stand-up assisting device) 11 so as to tilt in a side view while moving up and down. That is, in a state where a person is seated, the seat 2 is lowered to a substantially horizontal posture as shown in FIG. 1A, and when the person leaves the seat, as shown in FIG. 2 rises and tilts forward so that the rear end is higher. In addition, the seat 2 moves backward while being raised, and when it is fully raised, it moves backward by a certain size (for example, about several centimeters to 10 centimeters). In this retreated state, even if a person stands, the auxiliary horizontal frame 8 does not hit the foot. In addition, since the front horizontal rail 6 is shifted backward, the feet of a person standing do not hit the front horizontal rail 6.

(2) Details of Mechanism Unit Next, details of the mechanism unit 11 will be described with reference to FIG. For example, as clearly shown in FIG. 3, the mechanism unit 11 includes an upper support frame 12 fixed to the lower surface of the seat 2, a lower support frame 13 fixed to the front and rear horizontal rails 6 and 7, and the upper and lower support frames 12. , 13 at the front end thereof and a pair of left and right rear links 15 connecting the upper and lower frames 12, 13 at the rear end thereof, and a group of these links 14, 15 provides a parallel link. A link mechanism similar to is configured.

  It is also possible to directly attach the link mechanism to the lower surface of the seat 2 without the upper support frame 12. Similarly, it is possible to eliminate the lower support frame 13 and attach the link mechanism directly to the upper surface of the leg 1.

  Since the seat 2 is connected not to the X link mechanism but to the lower support frame 13 via a link mechanism similar to a parallel link mechanism, the seat 2 moves up and retreats. Further, as clearly shown in FIG. 5C, since the length L1 of the front link 14 is shorter than the length L2 of the rear link 15, the seat 2 tilts forward while rising, The robot moves backward by L3 and leans forward by θ1 with respect to the horizontal (initial posture).

  For example, as clearly shown in FIG. 4, the upper support frame 12 has left and right downward side plates, while the front link 14 also has left and right rearward side plates, and the front end portion of the downward side plate in the upper support frame 12 The upper end of the front link 14 is connected by a horizontally elongated first shaft 16. Further, the lower support frame 13 has upward left and right side plates, and a lower end portion of the front link 14 and a front end portion of the upward left and right side plates in the lower support frame 13 are connected by a second shaft 17.

The upper end of the rear link 15 is connected to the upper support 12 by a third shaft 18, and the third shaft 18 is inserted into a side plate of the upper support frame 12 and a downward bracket 19 provided on the lower surface of the upper support frame 12. Has been. The third shaft 18 is separated into two on the left and right, and the third shaft 18 is not positioned between the left and right downward brackets 19. The lower end of the rear link 15 is connected to the lower support 13 by the fourth shaft 20, and the fourth shaft 20 is connected to the left and right side plates of the lower support frame 13 and the upward bracket 21 provided on the lower surface of the lower support frame 13. It is inserted.

  For example, as clearly shown in FIG. 4, the mechanism unit 11 includes a spring unit 22 that urges each rear link 15 backward. The spring unit 22 includes a compression coil spring 23 that expands and contracts substantially in the front-rear direction, a rear spring receiver 24 that supports the spring 23 from the front, and a rear spring receiver 25 that supports the spring 23 from the rear. Among these, the front spring receiver 24 is inserted through the second shaft 17. On the other hand, the rear spring receiver 25 is connected (inserted) to a fifth shaft 26 that is inserted through the height of the rear link 15 in the vertical direction.

  The rear spring receiver 25 is located between the two rear links 15 located inside. As described above, since the third shaft 18 is not positioned between the left and right downward brackets 19, the rear spring receiver 25 can enter between the left and right downward brackets 19. For this reason, when the seat 2 is lowered, the upper support frame 12 can be as close as possible to the lower support frame 13.

  For example, as shown in FIG. 5 (B), the spring receivers 24 and 25 are provided with a pair of left and right extension guide bodies 27 and 28 that are located on both sides of the spring 23 and extend substantially in the front-rear direction. . The extension guide bodies 27 and 28 are plate-like and overlap each other, and the extension and contraction of the spring 23 is allowed by inserting the guide pins 30 and 31 into the elongated holes 29 formed in both. The guide pins 30 and 31 are a set of two. One guide pin 30 is fixed to one telescopic guide body 27 and 28, and the other guide pin 30 is fixed to the other telescopic guide body 28. . The spring unit 22 may have other forms such as a cylindrical shape.

  The fifth shaft 26 is an urging force acting shaft (a connecting portion between the spring means and the link), and is fitted in a long hole 33 formed in the rear link 15. The long hole 33 is formed in a concave arc shape facing rearward in a side view. In addition, a resin bush 34 is attached to the rear link 15 in order to smooth the movement of the fifth shaft 26 and prevent the generation of abnormal noise.

  For example, as shown in FIG. 6, a resin or metal guide roller 35 is fitted into a portion of the fifth shaft 26 between the rear link 15 at the left and right outer ends and the rear link 15 positioned inside thereof. The guide body 36 that controls the urging force by the spring 23 during the seating movement is fixed (arranged) at two locations below the guide roller 35 in the lower support frame 13.

  As shown in FIG. 5B and FIG. 6B, the guide body 36 has a guide surface 37 that is inclined when viewed from the side, on which the guide roller 35 hits during seating movement. The guide surface 37 is inclined so that the back is high and the front is low, and the front end portion is a low-inclined portion 37a that is gently inclined and curved upward concavely, and the portion behind it is substantially The main inclined portion 37b is inclined at a certain angle.

  In the present embodiment, the front and rear rear links 14 and 15 constitute lifting guide means for guiding the raising and lowering and tilting of the seat 2, and the spring unit 22 constitutes spring means, and the fifth shaft 26 and the rear The long hole 33 of the link 15 constitutes a reaction force switching means, and the guide body 36 and the fifth shaft 26 are part of a control means for controlling the urging force of the unit 22 spring means against the seat 2 during the seating movement. It is composed.

(3) Summary In the above configuration, when a person is seated, as clearly shown in FIG. 5 (A), the rear link 15 is tilted forward and the fifth shaft 26 is positioned at the upper end of the elongated hole 33. doing. In this state, the elastic force stored in the spring 23 is the largest, but as shown in FIG. 5 (B), the rear link 15 is tilted forward to a state close to the sleeping position, and the angle θ3 with respect to the horizontal is Since it is small, the raising action of the rear link 15 is small. That is, since θ3 is small, the moment of the spring 23 acting on the rear link 15 (that is, the moment causing the seat 2 by the spring 23) is small.

  Therefore, the urging force (or the force for raising the rear link 15) against the seat 2 is F1, which is the smallest force, as shown in FIG. 9A. However, as shown in FIG. 5B, since the fifth shaft 26 is above the line 39 connecting the axes of the second shaft 17 and the fourth shaft 20, the spring 23 causes the rear link 15 to be raised. Therefore, when the seat 2 is not loaded, the seat 2 is raised and tilted by the spring 23.

  Therefore, when a person who has been seated moves his / her arm by lifting both hands on the armrest 8, the upper end of the long hole 33 is pushed by the fifth shaft 26, so that the rear link 15 is pivoted so as to be raised. As a result, the front link 14 also rotates, and as a result, the seat 2 rises and tilts forward. FIG. 6A shows a state in the middle of ascent. At this time, as shown in FIG. 8, the distance L4 from the fourth shaft 20 to the fifth shaft 26 is larger than the distance L5 from the fifth shaft 26 to the third shaft 18.

  And since the spring 23 is extended with the raising rotation of the rear link 15 (or the raising of the seat 2), the elastic force is reduced, while the raising angle of the rear link 15 is increased. The moment at which the rear link 15 is raised by the spring 23 increases as the angle at which the lever 23 is raised increases. However, the increase in the moment prevails over the decrease in the spring force. The power increases as shown by a curve A in FIG.

  Further, since the difference between the decrease in spring force and the increase in moment decreases in proportion to the amount of increase in the seat 2, the degree of increase in the urging force against the seat 2 is large at the beginning and increases. It changes so that it becomes small with. Further, the seat 2 retreats as it rises, and the point of application of the load retreats in conjunction with this, so the forward force (forward moment) acting on the rear link 15 also decreases. Also from this point, the degree of increase of the urging force with respect to the seat 2 is large at the beginning of the rise, and changes so as to decrease as it rises.

  In other words, when standing up, the differential value of the change in biasing force is negative at any position. Such a change in the urging force appears from the viewpoint of a seated person as a phenomenon in which the body is strongly pushed up at the beginning of the rise and weakened at the end of the rise. For this reason, there is no phenomenon in which a person protrudes forward with the seat 2, and the standing motion can be supported in a relaxed state. This is one of the great advantages of this embodiment.

  The long hole 33 of the rear link 15 can be formed in a simple shape with a simple vertical top and bottom, or can be formed in a shape in which only the upper end is bent backward. When the shape is formed, the change in the inclination of the rear link 15 and the movement of the fifth shaft 26 are combined, and the urging force is smoothly increased, which is preferable. This is also one of the advantages of this embodiment.

  More specifically, when the elongated hole 33 is formed into a curved shape that is concaved backward as in the embodiment, first, the upper half of the elongated hole 33 is bent obliquely upward and rearward, so that in the standing state, the pin The pin 26 can be held at that position without the 26 being moved to the back side.

On the other hand, since the lower half of the long hole 33 warps obliquely downward and rearward, the direction of action of the urging force by the spring 23 is directed to the direction of sleeping with respect to the long hole 33 when seated. The spring force does not act strongly as the push-up force of the seat 2, and can be set to a force sufficient to raise the seat 2 at the initial stage of the standing motion. Thereby, the feeling of pushing up with respect to a person can be eliminated.

Furthermore, in the seated state, the fifth shaft 26 can be brought as close to the fourth shaft 20 as possible, so that the urging force of the spring 23 against the seat 2 can be weakened. As a result, the person can sit down smoothly without receiving a push-up feeling .

  Furthermore, the long hole 33 is curved into a banana-like shape as a whole, and the lower end of the upper half of the upper half and the upper end of the lower half of the lower and upper part of the lower half are bent downward. Since it is smoothly continuous (because the connecting portion between the upper half and the lower half is smoothly curved), the urging force by the spring 23 and the resistance due to the load on the body change smoothly. Therefore, the seat 2 moves up and down smoothly, and is excellent in usability.

  In this way, when the form similar to the banana shape composed of the upper half part warped so as to face obliquely upward and backward and the lower half part warped obliquely downward and backward is adopted as the long hole 33, This is preferable because smoothness can be ensured.

FIG 6 (B) shows a state in which the seat 2 is fully raised, the reach this state, the urging force of the spring 23 against the fifth shaft 26 is released, FIG. 7 (A) and FIG. 8 As shown, the fifth shaft 26 descends along the elongated hole 33. In this state, the posture of the rear link 15 hardly changes. Therefore, the seat 2 remains raised. Note that the spring unit 22 may be biased by a weak spring in the direction of turning downward.

Then , as the fifth shaft 26 moves to the lower end of the long hole 33, as shown in FIG. 8, the distance L6 from the fourth shaft 20 to the fifth shaft 26 is changed from the fifth shaft 26 to the third shaft 18. It becomes smaller than the distance L1. As a result, as shown in FIG. 9A, the support force (biasing force) of the seat 2 by the spring 23 is greatly reduced from F4 to F2 when the fifth shaft 26 is at the upper end of the elongated hole 33. What is important is the change in the ratio of L4; L5 and L6: L7, and it is not essential that L4> L5 and L6 <L7. That is, there should be a relationship of L5 / L4 <L7 / L6.

From the viewpoint of the user, the fact that the initial urging force with respect to the seat 2 decreases to F2 in a state where the seat 2 is fully raised means that the seat 2 starts to descend with little resistance at the beginning of the seating. Accordingly, it is possible to easily drop the waist while placing both hands on the armrest 8 and stably supporting the body with both hands. For this reason, the waist can be dropped while ensuring the stability of the body.

  In other words, if the urging force against the seat 2 is large, the arm 2 is released unless the arm 2 is lifted and the weight of the arm 2 is increased, or the seat 2 is pushed down by its own force. Then, the body may be supported only by the feet and buttocks, and the stability of the body may be lowered. In this state, the seat 2 can be lowered by lowering the waist while being supported at three points, so that the transition to the sitting posture can be performed safely and smoothly.

  When the fifth shaft 26 is completely lowered to the lower end of the elongated hole 33, the guide roller 35 provided on the fifth shaft 26 abuts or approaches the rear end of the guide body 36. In the state where the person is seated, the fifth shaft 26 is located at the rear end of the elongated hole 33, so that the seat roller 2 starts from the urging force F2 of the spring 23 against the seat 2, but the guide roller 35 By being guided by the guide body 36, the fifth shaft 26 moves upward from the lower end of the elongated hole 33 as the rear link 15 tilts forward.

Therefore, the acting ratio of the urging force of the spring 23 is gradually changed from L7 / L6 to L5 / L4, the moment acting on the seat 2 is increased, and the spring 23 is contracted to reduce the elastic force. It will increase. Due to the increase in the moment and the increase in the elastic force, the total urging force (reaction force received by the seat 2) with respect to the seat 2 gradually increases as the seat 2 descends as shown by the curve B in FIG. ( Gradual increase ).

  In this manner, the urging force against the seat 2 gradually increases, so that the seat 2 can be prevented from suddenly descending and the seat 2 can be gradually lowered. That is, a cushioning action (relaxation action) is given to the downward movement of the seat 2.

  The contraction of the spring 23 increases the biasing force on the seat 2, and the movement of the fifth shaft 26 in the elongated hole 33 also increases the biasing force on the seat 2. On the other hand, when the seat 2 moves forward as the seat 2 descends, the point of action of the load on the seat 2 shifts to the near side. This is because the rear link 15 is lowered and the rear link 15 is moved forward. (In other words, it causes a decrease in the urging force against the seat 2). Therefore, the inclination angle of the guide body 36 and the length of the long hole 33 are set in consideration of the balance of the action of these forces.

  At the end of the lowering of the seat 2, when the guide roller 35 reaches the low inclined portion 37 a of the guide body 36, the posture of the spring 23 hardly changes and the fifth shaft 26 has completely moved to the upper end of the long hole 33. It is in a state. Then, since the rear link 15 is tilted forward, the point of application of the load is steadily shifting forward, so that the force for tilting and rotating the rear link 15 is very large. The urging force with respect to the seat 2 peaks when the fifth shaft 26 shifts from the main inclined portion 37b of the guide body 36 to the low inclined portion 37a, and thereafter suddenly decreases and reaches F1.

  In this case, the fifth shaft 26 moves from the main inclined portion 37b of the guide body 36 to the low inclined portion 37a, but the inclination of the low inclined portion 37a is so gentle that the movement of the fifth shaft 26 that moves on the low inclined portion 37a is suppressed. As a result, a cushioning effect is exhibited at the end of sitting.

Therefore, the person does not receive a feeling of pushing up by the seat 2 in a state where the seat 2 is fully lowered. Further, as shown in the graph of FIG. 9A, the sudden decrease in the urging force is performed in a state in which the seat 2 is almost completely lowered (the end of the descent). never give a sense of discomfort.

In the process where a person puts both hands on the armrest 8 and falls down, the burden on both hands increases as the hip falls, but by increasing the biasing force against the seat 2, the burden on both hands can be reduced, and At the end of the sitting movement, the person often pulls out the power from both hands, but in this state, the seat 2 is almost lowered, so there is no phenomenon that the seat 2 falls, and it is safe and smooth. The seating movement can be realized.

Even if the chair is used as a set with a table, and the chair is installed at a position where a person can sit and eat as it is , the seat 2 moves backward when standing up, so the body is table It is possible to eliminate the anxiety of hitting and to leave the seats easily. Moreover, since the seat 2 moves forward when seated, an appropriate front-rear position can be maintained in the seated state while facilitating lateral movement to the chair.

  The present invention can be embodied in various ways other than the above-described embodiment. For example, it is possible to adopt an X link mechanism as the seat raising / lowering guide means (in this case as well, it is possible to move the seat 2 up and back by moving a part of the links of the components) .) It is also possible to urge the seat directly with spring means (any of the movable members may be urged). Further, as the spring means, a gas spring can be used instead of the compression coil spring as in the embodiment. Or a leaf spring or a torsion coil spring can be used.

  As a means for changing the urging force, the spring means can be moved back and forth as the seat is raised and lowered. Further, the seat may be a mode that only tilts back and forth or a mode that only moves up and down. Moreover, the chair which is an application target does not need to be mobile, and may be fixed. As the guide means, a guide body which is a kind of cam is used, but other structures such as a long hole can be adopted.

It is also possible to provide a rotary damper on the shaft such as the fourth shaft 20 to smooth the displacement from the sitting state to the standing state. Further, the backrest and the seat may be integrated.

  The present invention is actually applicable to a standing auxiliary chair. Therefore, it can be used industrially.

1 leg 2 seat 3 backrest 8 armrest
11 Mechanism (Standing assist device)
12 Upper support frame 13 Lower support frame 14 Front link 15 Rear link 22 Spring unit 23 Spring 24 Front spring receiver 25 Rear spring receiver 26 Fifth shaft (connecting portion)
33 Long hole 35 Guide roller 36 Guide body as an example of guide means 37 Guide surface 37a Low slope 37b Main slope

Claims (7)

A seat attached to the leg to be lifted or tilted back and forth, or lifted and tilted back and forth, spring means for supporting the person's standing motion and sitting motion by urging the seat, and the person from the sitting state to the standing state A reaction force switching means that automatically changes the urging force of the spring means against the seat at the time of the standing motion support that transitions and at the time of the seating motion support when the person transitions from the standing state to the seating state ,
At the time of standing motion support, the urging force of the spring means against the seat increases as a person transitions from the seated state to the standing state, while the maximum biasing force of the spring means at the time of the seating motion support is The configuration is smaller than the maximum urging force at the time of standing up support,
The biasing force of the spring means against the seat at the time of the seating movement support is set so as to gradually increase from the start of the seating movement and greatly decrease at the end by the guide means.
Standing auxiliary chair. A seat attached to the leg to be lifted or tilted back and forth, or lifted and tilted back and forth, spring means for supporting the person's standing motion and sitting motion by urging the seat, and the person from the sitting state to the standing state A reaction force switching means that automatically changes the urging force of the spring means against the seat at the time of the standing motion support that transitions and at the time of the seating motion support when the person transitions from the standing state to the seating state,
The seat is supported by a leg portion so as to move up and down at least by a link mechanism having a plurality of links. By connecting one end of the spring means to the link mechanism, a person's standing motion and seating motion can be prevented. Supported,
Further, by changing the position of the connecting portion between the spring means and the link mechanism between the standing motion support in which the seat is raised and the seating motion support in which the seat is lowered, It has a different urging force from the time of support,
The biasing force of the spring means against the seat at the time of the seating movement support is set so as to gradually increase from the start of the seating movement and greatly decrease at the end by the guide means.
Cause elevation auxiliary chair. One end of the spring means is connected to the link mechanism so as to move relative to the up and down direction, and the connecting portion is at a high position at the time of the upright support,
When the link mechanism is completely rotated in the standing support direction, the connecting portion of the spring means with respect to the link mechanism is lowered by the weight of the spring means or the biasing means. The biasing force is lower than the final biasing force at the time of standing support,
And, at the time of the seating movement support, the downward movement of the connecting portion of the spring means with respect to the link mechanism is guided by the guide body in the inclined posture in the side view, so that the urging force at the time of the seating movement support gradually increases. It is set to change so as to greatly decrease at the end part,
The standing assistance chair according to claim 2 . A seat attached to the leg to be lifted or tilted back and forth, or lifted and tilted back and forth, spring means for supporting the person's standing motion and sitting motion by urging the seat, and the person from the sitting state to the standing state A reaction force switching means that automatically changes the urging force of the spring means against the seat at the time of the standing motion support that transitions and at the time of the seating motion support when the person transitions from the standing state to the seating state,
The seat is set so that the posture and the position change so as to rise while tilting forward in a side view while retreating as a whole while supporting the standing motion.
Cause elevation auxiliary chair. A stand-up assisting device that is arranged between a leg portion and a seat of a chair and supports the seat so as to move up and down or tilt forward and backward or tilt and back and forth.
Spring means for supporting the person's standing motion and sitting motion by urging the seat, and during the standing motion support when the person transitions from the sitting state to the standing state and when the person moves from the standing state to the sitting state And a reaction force switching means for automatically changing the urging force of the spring means against the seat,
At the time of standing motion support, the urging force of the spring means against the seat increases as a person transitions from the seated state to the standing state, while the maximum biasing force of the spring means at the time of the seating motion support is It is smaller than the maximum urging force at the time of standing up support,
Furthermore, the biasing force of the spring means against the seat at the time of the seating movement support is set so as to change gradually so as to gradually increase from the start of the seating movement and greatly decrease at the end by the guide means. Standing assist device for chairs. A stand-up assisting device that is arranged between a leg portion and a seat of a chair and supports the seat so as to move up and down or tilt forward and backward or tilt and back and forth.
A link mechanism disposed between the seat and the leg so that the seat moves up and down at least; spring means for biasing the seat to support a person's standing motion and seating motion; and A reaction force switching means that automatically changes the urging force of the spring means against the seat at the time of standing motion support that shifts to a standing state and at the time of seating motion support when a person transitions from a standing state to a sitting state;
The link mechanism includes a plurality of links, and by connecting one end of the spring means to the link mechanism, a standing motion and a sitting motion of a person are supported,
Further, by changing the position of the connecting portion between the spring means and the link mechanism between the standing motion support in which the seat is raised and the seating motion support in which the seat is lowered, It has a different urging force from the time of support,
The biasing force of the spring means against the seat at the time of the seating movement support is set so as to gradually increase from the start of the seating movement and greatly decrease at the end by the guide means.
Standing assist device for chairs. A stand-up assisting device that is arranged between a leg portion and a seat of a chair and supports the seat so as to move up and down or tilt forward and backward or tilt and back and forth.
Spring means for supporting the person's standing motion and sitting motion by urging the seat, and during the standing motion support when the person transitions from the sitting state to the standing state and when the person moves from the standing state to the sitting state And a reaction force switching means for automatically changing the urging force of the spring means against the seat ,
At the time of supporting the standing motion, the seat and the position are set so that the posture and the position are changed so as to rise while tilting forward in a side view while retreating as a whole.
Standing assist device for chairs.

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