JP5625811B2 - Standing seat device - Google Patents

Description

  The present invention relates to a standing seat device that maintains a standing posture of a seated person.

  2. Description of the Related Art Conventionally, there are industrial vehicles that operate in a standing posture, and seat devices for driving in this standing posture have been proposed. The seat device includes a backrest pad formed by a backrest portion and a seat portion, and the backrest pad is attached to a driver's seat via an elevation adjustment mechanism. This makes it possible to select the driving posture and to reduce the fatigue of the seated person due to long-time driving (for example, see Patent Document 1).

JP 2005-132525 A

  However, such a conventional standing-type seat device has a configuration in which the back surface of the back pad and the surface that holds the buttocks are matched to the shape of the buttocks and the lifting function of the back pad only makes the seated person's spine ideal for walking. A typical S-shape cannot be retained. As a result, the lumbar vertebra has a large inclination angle with respect to walking, and the lumbar vertebra is always bent. For this reason, there is a possibility that a sense of incongruity may occur in the lower back as the sitting time becomes longer.

  Therefore, the present invention provides a standing seat device that can reduce a sense of incongruity at the waist during long-time driving.

In the standing seat device of the present invention, the seat seat surface portion that supports the buttocks of the seated person is disposed at the rear of the seat surface that supports the lower part of the seat bone from the tailbone of the seated person, and in front of the rear portion of the seat surface. A seat front portion that extends along the rear portion of the seat surface and supports the thigh of the seated person, and the seat seat surface portion is inclined obliquely downward toward the front as a whole. It is arranged with an inclination angle, and when the seated person sits on the seat surface part, it is arranged so that the rear part of the seat surface is lower than the front part of the seat surface, and a step is formed at the boundary between the rear part of the seat surface and the front part of the seat surface. The size of the step is set to the non-interference height of the thigh .

  According to the present invention, the lower part of the seat bone of the seated person supported by the rear part of the seat surface is supported by the step from the front and the lower side of the seat surface part, and the coccyx part is pushed up. As a result, the center-of-gravity axis of the trunk moves forward from the rear position of the coccyx when seated to the vicinity of the hip joint position in a side view, and as a result, the pelvis is stabilized so that the entire pelvis is close to that when walking. Can be held. For this reason, it is possible to reduce a sense of incongruity of the waist with respect to sitting for a long time.

FIG. 1 is a perspective view showing a first embodiment of a standing seat device according to the present invention. FIG. 2 is a side view schematically showing a relationship between a seat seat surface portion in a state where a seated person is seated on the seat device of the first embodiment and a waist skeleton of the seated person. FIG. 3 is a side view showing a skeletal structure during walking of the human body in order to explain the seat device of the present invention. FIG. 4 is a side view showing a skeletal structure when a seated person is seated on the seat device of the first embodiment. FIG. 5 is an enlarged view showing the state of the pelvis shown in part I in FIG. FIG. 6 is an enlarged view showing a state of the pelvis shown in a portion II in FIG. FIG. 7 is a side view showing a skeletal structure during normal sitting in order to explain the seat device of the present invention. FIG. 8 is a graph showing the relationship of the lower limb weight sharing ratio to the forward tilt angle of the seat seat portion in the seat device according to the present invention. FIG. 9 is a perspective view showing a second embodiment of a standing seat device according to the present invention. FIG. 10 is a perspective view showing a third embodiment of a standing seat device according to the present invention. FIG. 11 is a cross-sectional view taken along the line III-III in FIG. 10 showing an installation state of the seat device of the third embodiment. FIG. 12 is a perspective view showing a fourth embodiment of a standing seat device according to the present invention. FIG. 13 is a perspective view illustrating a modified example of the seat device according to the fourth embodiment. FIG. 14 is a perspective view showing a fifth embodiment of a standing seat device according to the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 8 show a first embodiment of a standing seat device according to the present invention. Although not shown, this seat device can be applied to, for example, an industrial vehicle that is operated by a driver (sitting person) standing. However, the present invention is not limited to this, and it can be used as a normally used chair for standing seats, so that a seated person can sit in a standing position.

  That is, as shown in FIG. 1, the seat device according to the present embodiment includes a seat seat surface portion 1 that supports a heel portion 110 of a seated person 100 (see FIG. 4). As shown in FIGS. 1 and 2, the seat seat surface portion 1 is disposed and extends in front of the seat surface rear portion 2 and the seat surface rear portion 2 that supports the seat bone lower portion 130 from the tailbone portion 120 of the seated person 100, And a seat front part 3 that supports the thigh 140 of the seated person 100. The seat surface front portion 3 is disposed above the seat seat surface portion 1 in the direction orthogonal to the seat surface rear portion 2, and a step 4 is formed between the seat surface rear portion 2 and the seat surface front portion 3. . That is, the step 4 extends from the front end portion 2 f of the seat surface rear portion 2 toward the front obliquely upward and is connected to the rear end portion 3 r of the seat surface front portion 3. In the present embodiment, the rear end portion 2r of the seating surface rear portion 2 and the front end portion 3f of the seating surface front portion 3 are arcuate surfaces 2C and 3C that smoothly curve downward.

  In addition, the seat seat surface portion 1 is used by being installed on a floor surface or a pedestal (not shown). As shown in FIG. 2, the seat seat surface portion 1 is inclined obliquely forward with a predetermined forward tilt angle θ. It is arranged facing down. At this time, a mechanism for adjusting the height according to the body shape of the seated person 100 may be provided between the seat seat surface portion 1 and the floor surface or the pedestal. The forward tilt angle θ will be described later in detail.

  As shown in FIG. 2, the seat seat surface portion 1 configured as described above supports the lower part of the seat bone 130 from the front and the lower side by the step 4 when the seated person 100 is seated. Further, by providing the seat seat surface portion 1 with the forward tilt angle θ, the pelvis 150 of the seated person 100 is held on the seat seat surface portion 1 in an upright state.

  Here, the standing state of the pelvis 150 refers to a state equivalent to the arrangement of the pelvis 150 in the skeletal structure of the standing human body 10 shown in FIG. 3, and actually the seat seating surface portion in the substantially standing state shown in FIG. 1 is the arrangement of the pelvis 150 in the skeletal structure held at 1.

  When the standing state of the pelvis 150 shown in FIG. 3 and the standing state of the pelvis 150 shown in FIG. 4 are shown in more detail, the arrangement of the pelvis 150 shown in FIGS. 5 and 6 can be seen, respectively. At this time, the pelvic standing angle α1 during bipedal walking is generally larger than the pelvic standing angle α2 when sitting in a standing position. This is because the center of gravity C1 (see FIG. 3) of the trunk (upper body) is positioned in front of the human body 10 in a side view than the center of gravity C2 (see FIG. 4) of the trunk when sitting in a standing position. It is to do.

  However, the standing state of the pelvis 150 in the present embodiment shown in FIG. 4 is close to the arrangement of the pelvis 150 during walking as compared to the arrangement of the pelvis 150 when sitting normally, as shown in FIG. The sacrum 160 that is directly coupled to the pelvis 150 is substantially upright. This is because the center-of-gravity axes C1 and C2 are located close to each other when walking and standing, while the center-of-gravity axis C3 of the trunk is located behind the tailbone 120 in a side view when seated normally. Is due to

  As described above, in this embodiment, depending on the support position around the pelvis 150 and the holding angle associated with the seating, as shown in FIG. By raising the angle with respect to the normal sitting posture, it becomes possible to form an S-shape equivalent to that during walking.

  On the other hand, the above-mentioned forward inclination angle θ necessary for realizing the arrangement of the pelvis 150 shown in FIG. 4 can be defined by the share ratio between the self-weight heel portion 110 and the lower limbs. FIG. 8 shows how the weight sharing ratio of the lower limbs changes when the forward inclination angle θn of the seat seat surface portion 1 is changed.

  That is, as shown in FIG. 8, when the forward inclination angle θn of the seat seat surface portion 1 changes from 0, there is a changing point P where the curvature of the own weight sharing curve K changes in the vicinity of about 25 degrees. In the case where the forward tilt angle θn is 0, that is, the seat seating surface angle by normal seating, the lower limb weight sharing ratio is 10 several percent, which is responsible for the weight of the lower human body part from the knee. However, there is a process A in which the weight of the thigh 140 is gradually added to the weight until the change point P.

  The weight-sharing curve K after the change point P indicates that the trunk center-of-gravity axis C2 moves forward in the side view on the skeleton of the human body, and the lower limbs positively determine the amount of weight pressing on the hip 110 and the ratio of weight sharing. You will enter an area of dominant control. For this reason, after the change point P, the standing of the pelvis 150 is promoted by the effects of both the increase in the forward inclination angle θn of the seat seat surface portion 1 and the active weight sharing of the lower limbs. In addition, it has been confirmed that the own weight sharing curve K shown in FIG. 8 generally shows a tendency to have the same change point P regardless of the physique, and the corresponding angle θn and the sharing rate are actually By sitting, it can be measured and defined for each body type.

  The forward tilt angle θn effective for maintaining the posture of the pelvis 150 in the optimum state in this embodiment, that is, the aforementioned forward tilt angle θ is a region including the changing point P shown in FIG. It can be defined as region B with a rate of 20-50 percent. The region B defines the region in a form corresponding to individual body types such as a physique difference and other human body skeletons or subcutaneous fat percentage.

  Further, the region where the lower limb weight sharing ratio is 20 to 50% is known as a region that enables active use of the muscles of the lower limbs. Therefore, the lower limbs are substantially stable in the posture of the trunk when sitting in a standing position. It can be defined as an area where the effect of effectively functioning by increasing the role of can be obtained.

  Therefore, in this embodiment, the forward weight inclination angle θ is the position where the center-of-gravity axis C2 of the trunk is moved forward toward the vicinity of the hip joint part, and the weight is supported by the seat seat surface portion 1 while the weight is the buttocks. 110 and the lower limb are set so that the sharing ratio of the lower limbs is in the range of 20% to 50%.

  Further, in the present embodiment, the seat surface rear portion 2 and the seat surface front portion 3 of the seat seat surface portion 1 are arranged with a height difference S in the vertical direction by the step 4, but the seat surface rear portion 2 and the seat surface front portion 3 are arranged. Are arranged almost in parallel.

  As described above, the seat rear portion 2 and the seat front portion 3 are arranged substantially in parallel, whereby the ground inclination angle of the thigh 140 of the seated person 100 is also supported with the forward inclination angle θ.

  Furthermore, in the present embodiment, the magnitude of the height difference S of the step 4 is set to the non-interference height of the thigh 140.

  Here, the non-interference height of the thigh 140 is, as shown in FIG. 2, when the pelvis 150 stands up along the anteversion inclination angle θ, the thigh bone 190 and its lower muscle and In supporting the lower part of the thigh 140 formed of the superficial soft tissue 200 such as subcutaneous fat, the interference of the step 4 with the effective seating surface formed by contact with the buttocks 110 supported by the rear seat surface 2 is not excessive. As the size, the step 4 is a height defined on the skeleton structure of the human body.

  With the above configuration, according to the standing seat structure of the first embodiment, the seat seat rear surface portion 2 has the seat seat rear surface portion 2 due to the step 4 interposed between the seat rear surface portion 2 and the seat surface front portion 3. A height difference S is provided so that the rear end portion 3r of the seat front portion 3 is located above the front end portion 2f, and the seat seat surface portion 1 is tilted forward as a whole with a forward tilt angle θ. It is inclined and arranged downward. Therefore, since the lower part 130 of the seated person 100 supported by the rear part 2 of the seating surface is supported by the step 4 from the front and the lower side, the tailbone part 120 is pushed up, and the weight of the lower limb part is further inclined forward by an inclination angle θ. The optimal ratio set in. As a result, the center-of-gravity axis C2 of the trunk moves forward from the rear position of the coccyx when seated toward the vicinity of the hip joint position in a side view. Can be held.

  Further, due to the human body structure of the seated person 100, when the pelvis 150 is erected, the lumbar vertebra 18 coupled to the pelvis 150 is also almost erected, so that the lower part of the vertebral column 170 is erected, and thereby the entire vertebral column 170 A so-called S-shape is formed. In the human body structure, the state in which the spinal column 170 forms an S-shape in this way is a posture that can be stabilized in a two-leg standing posture, and the lumbar discomfort can be reduced as the eccentric load on the lumbar portion 180 is reduced.

  Further, according to the first embodiment, the above-described forward inclination angle θ is the position where the trunk's center-of-gravity axis C2 has moved forward toward the vicinity of the hip joint part and is supported by the seat seat surface portion 1 by its own weight. In the state, the lower limb sharing rate when the own weight is shared between the buttocks 110 and the lower limbs is set to be in a range of 20% to 50%. As a result, the standing of the pelvis 150 is promoted by the effects of both the increase in the forward inclination angle θn of the seat seat surface portion 1 and the active weight sharing of the lower limbs, and the S-shape of the spinal column 170 is more reliably and naturally formed. become able to.

  Further, according to the first embodiment, the seat rear surface portion 2 and the seat front portion 3 of the seat seat surface portion 1 set to the forward inclination angle θ are arranged substantially in parallel, so that the seat surface rear portion 2 The entire pelvis 150 of the seated person 100 is held, and an upright state close to that during walking can be maintained. Further, since the lower part of the thigh 140 following the pelvis 150 is also held at the same forward tilt angle θ, a naturally stable seating posture can be taken.

  Furthermore, according to the first embodiment, the size of the step S of the step 4 is set to the non-interference height of the thigh 140. Since an excessive interference does not occur at the step 4 with respect to the effective seating surface formed by the contact of 110, the standing posture of the pelvis 150 that ensures the forward and downward retention of the lower part of the seat bone 130 can be taken. In addition to this, since the feeling of pressure of the holding part of the thigh 140 in the seat front part 3 is suppressed, it is possible to take a stable seating posture by naturally landing the lower limbs.

[Second Embodiment]
FIG. 9 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.

  The main difference between the present embodiment and the first embodiment is that the surface of at least the seat rear portion 2 and the seat front portion 3 of the seat seat surface portion 1 is covered with a surface member 5 such as urethane that can be compressed and deformed. When the seat member 100 is seated, the surface member 5 that covers the rear portion 2 of the seating surface sinks, so that the predetermined forward tilt angle θ described above is set. Note that, in the present embodiment, the entire surface member 5 is covered with the seat surface rear portion 2, the seat surface front portion 3, and the step 4 of the seat seat surface portion 1.

  Of course, even when the seat seat surface portion 1 is covered with the surface member 5 as described above, when the seated person 100 is seated on the seat seat surface portion 1 and supports the heel portion 110, the lower tail portion 130 is supported from the tail bone portion 120. The support angle of the effective seating surface after the surface member 5 of the seating surface rear portion 2 is submerged is set so as to be the forward tilt angle θ with respect to the ground surface as in the first embodiment.

  Further, in the present embodiment, the seat surface portion 1 has a larger sinking amount of the surface member 5 that covers the rear portion 2 of the seat surface when the seated person 100 is seated than the front portion 3 of the seat surface.

  Therefore, according to the standing seat device of the second embodiment, the heel portion 110 of the seated person 100 is provided by the surface member 5 that covers the seat seat surface portion 1 while exhibiting the same function as the first embodiment. In addition, the contact of the contact portion of the thigh 140 becomes flexible, and the stimulation caused by one-contact when the seating position is shifted can be reduced.

  Further, since the sinking amount of the surface member 5 of the seat rear part 2 when the seated person 100 is seated is made larger than that of the seat front part 3, from the coccyx part 120 to the lower part of the seat bone 130 as in the first embodiment. Is set to the seat rear surface portion 2 of the seat seat surface portion 1. Thereby, a seated person's lower scapula 130 can be hold | maintained reliably and the function similar to 1st Embodiment can be exhibited.

[Third embodiment]
10 and 11 show a third embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The main difference between the present embodiment and the first embodiment is that the seat surface rear portion 2 is formed by the recess 6 formed along the shape of the buttocks 110 of the seated person 100, and a step 4A is provided at the front end of the recess 6. There is in point. In the present embodiment, the seat surface portion 1 </ b> A is formed thick enough to form the recess 6.

  Further, as shown in FIG. 11, the seat seat surface portion 1A of the present embodiment is installed on the floor surface or the pedestal with a forward tilt angle θ as in the first embodiment, and the spine 170 of the seated person 100 is placed. It will be held in an S shape. At this time, the seat seat surface portion 1A is attached so that the installation angle can be adjusted so that the original forward tilt angle θ is obtained.

  Therefore, even in the standing seat device of the third embodiment, the same function as that of the first embodiment can be exhibited. Even in the present embodiment, it is preferable that the height difference S of the step 4A is set to the non-interference height of the thigh 140, and the seat surface when the seated person 100 is seated. It is preferable that the amount of subsidence of the rear part 2 be larger than that of the front part 3 of the seating surface.

[Fourth Embodiment]
FIG. 12 shows a fourth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.

  This embodiment is mainly different from the first embodiment in that the seat seat surface portion 1B has a pair of left and right frames 7 extending in the front-rear direction on both left and right sides, and a belt extending between the pair of frames 7. This is because it is configured to include the member 8. In this case, the tension of the belt member 8 is set smaller in the belt member 8 provided in the seat surface rear portion 2 than in the seat surface front portion 3.

  That is, in the present embodiment, a portion corresponding to the seat rear portion 2 of the seat seat portion 1B is formed by stretching a wide cloth belt 81 between the pair of frames 7, and corresponds to the seat front portion 3. The portion is similarly formed by stretching a wide cloth belt 82 between the frames 7. The lower part 130 of the seat bone is supported from the tailbone 120 of the seated person 100 by the cloth belt 81 at the rear part 2 of the seat surface, and the thigh 140 is supported by the cloth belt 82 at the front part 3 of the seat surface. .

  At this time, the tension of the cloth-like belt 81 at the rear part 2 of the seating surface is made weaker than that of the cloth-like belt 82 at the front part 3 of the seating surface, and the sinking of the cloth-like belt 81 when the seated person 100 is seated It is larger than 82. As a result, as in the first embodiment, the front and lower sides of the seat bone lower portion 130 of the seated person 100 are held, and the pelvis 150 can be erected by providing the seat tilting angle θ on the seat seat surface portion 1B. It has become. In this case, when the seated person 100 is seated, the cloth belt 81 sinks deeper than the cloth belt 82, so that a step is generated between the belts 81 and 82.

  The pair of left and right frames 7 described above are supported by the rear frame 71 before connecting the front end portion and the rear end portion thereof, and the left, right frame 7 and the front and rear frames 71 are rectangular as a whole. I am doing.

  Therefore, even in the standing seat device of the fourth embodiment, the same function as that of the first embodiment can be exhibited.

  FIG. 13 shows a modification of the fourth embodiment, in which a flexible material 9 such as urethane that can be compressed and deformed is arranged on the upper side of the seat seat surface portion 1B.

  Therefore, according to the present modification, the contact portion of the support portion of the buttocks 110 of the seated person 100 and the support of the thigh 140 with the configuration of the effective seating surface due to the deformation of the flexible material 9 and the setting of the forward tilt angle θ relative thereto. The hitting can be made soft and the irritation caused by the hitting can be reduced.

[Fifth Embodiment]
FIG. 14 shows a fifth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.

  The main difference between the present embodiment and the first embodiment is that the seat seat surface portion 1C is entirely formed of a compressible and deformable thick material 10 having a predetermined thickness, and the seat surface rear portion of the thick material 10 is formed. The hardness of 2 is set lower than that of the front part 3 of the seating surface. As a result, when the seated person 100 is seated, the rear part 2 of the seat surface sinks deeper than the front part 3 of the seat surface, so that a step is generated between the front part 3 of the seat surface and the rear part 2 of the seat surface.

  The thick material 10 is formed of a material such as urethane having different hardnesses between the seating surface rear portion 2 and the seating surface front portion 3, and the hardness of the seating surface rear portion 2 is softer than that of the seating surface front portion 3. Then, at the boundary 11 portion between the rear seat surface portion 2 and the front seat surface portion 3, the support portion of the lower seat bone 130 is seated so as to sink into the rear seat surface portion 3. By maintaining the forward tilt angle θ of the effective seating surface after being deformed by the seating of the front surface portion 3 and the rear seat surface portion 2, the posture in which the pelvis 150 is raised can be maintained.

  Therefore, even in the seat device of the fifth embodiment, the same functions as those of the first and second embodiments can be exhibited.

  By the way, the standing seat device of the present invention has been described by taking the above embodiments as examples. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C Seat seat surface part 2 Seat surface rear part 2f Front end part of seat rear part 3 Seat surface front part 3r Rear end part of seat front part 4, 4A Step 5 Surface member 7 Frame 8 Belt member 10 Thick material 100 Seated person 110 Buttocks 120 Coccyx part 130 Sciatic part 140 Thigh part 150 Pelvis θ Pelvic inclination angle S Height difference C2 Trunk center of gravity axis

Claims (6)

A seat-type seat device that has a seat seat surface portion that supports the buttocks of the seated person and maintains the standing posture of the seated person ,
The seat seat surface portion is a rear seat surface that supports the seat bone from the tailbone portion of the seated person, and is disposed in front of the rear seat surface portion and extends along the extending direction of the seat back surface, and the thigh of the seated person And a seat front portion for supporting
When the seated person is seated on the seat surface portion, the rear portion of the seat surface is disposed below the front portion of the seat surface with respect to the orthogonal direction of the seat surface portion, and there is a step at the boundary portion between the rear portion of the seat surface and the front portion of the seat surface. As it is configured to occur,
The seat surface portion is inclined and arranged at a predetermined forward inclination angle toward the front diagonally downward direction ,
2. A standing seat apparatus, wherein the level difference is set to the non-interference height of the thigh .   The predetermined forward inclination angle is a position where the center of gravity axis of the trunk moves forward toward the vicinity of the hip joint part, and the weight is shared between the buttocks and the lower limbs in a state where the weight is supported by the seat seat surface part. 2. The standing seat device according to claim 1, wherein the lower limb sharing ratio is set to be 20% to 50%.   At least the surface of the seat seat surface portion is covered with a compressible surface member, and when the seated person is seated, the surface member sinks and the seat seat surface portion has the predetermined forward tilt angle. The standing seat device according to claim 1, wherein the seat device is a standing seat device. The standing seat device according to claim 1 or 3 , wherein when the seated person is seated, a sinking amount of a rear portion of the seating surface of the surface member is made larger than that of the front portion of the seating surface.   The seat seat surface portion includes a pair of frames extending in the front-rear direction on both the left and right sides, and a belt member stretched between the pair of frames. The tension of the belt member is greater than the front portion of the seat surface. Is set to be small, the standing seat device according to claim 1 or 2. The seat seat portion is entirely formed of a compressible and deformable thick material having a predetermined thickness, and the hardness of the rear portion of the seat surface of the thick material is set lower than that of the front portion of the seat surface. The standing seat apparatus according to claim 1 or 2.

Images