JP6710559B2 - Standing position worker chair - Google Patents

Description

The present invention relates to a chair. More specifically, the present invention relates to a chair suitable for stabilizing the posture of the operator and reducing the burden on the lower limbs during standing work, particularly standing surgery.

It is necessary to stabilize the posture of the worker and reduce the burden on the lower limbs even during standing work. For example, when performing microscopic surgery, endoscopic surgery, or catheter surgery in a standing position, the position of the surgical site may result in one-leg standing posture due to the axial foot when the foot pedal is operated, and the posture may become unstable. .. When the body position becomes unstable, a muscle force for stabilizing the body position is required, and the burden on the lower limbs is particularly large during a long-time operation, which causes fatigue. Further, the positional displacement between the eyepiece of the microscope and the operator's eyes due to instability of the body position also causes fatigue.

Therefore, there is a demand for a chair that can provide stability such as sitting and freedom of movement such as foot pedal operation while standing, that is, a chair that can be seated in a standing position.

As such a chair, there has been conventionally proposed a chair that supports the body of an operator during standing work to stabilize the posture and reduce the burden on the lower limbs (for example, Patent Documents 1 and 2). Each of these conventional chairs has a function of spilling up by a weight, and has a base material with a built-in weight, one leg with a lifting function, and a seat, and is tilted at an arbitrary angle. It is designed to support the body of a worker in a standing posture. These chairs allow the prop to be tilted in either direction, and when the worker lifts their hips from the seat, the chair acts as a weight so that the chair is in its original upright position (the prop is upright in the vertical direction). Work to return to the state of working.

Further, there is also a chair that employs a base formed of a bag filled with sand, and can change the shape of the base of the sand bag to tilt the chair at an arbitrary angle and maintain the inclination (Patent Document 3).

JP, 2003-40798, A JP, 2003-245163, A U.S. Pat. No. 4,130,263

However, in the chairs according to the inventions described in Patent Documents 1 and 2, there is a problem in the stability of the chair when it stands. That is, in the chairs described in Patent Documents 1 and 2, since the base has a spherical shape or a begoma shape, the degree of freedom of movement is high, but the stability in the upright state is poor, and the chair shakes for a long time and is easy to fall. It has an unstable structure.

In addition to the inability to achieve both stability when standing upright and freedom of movement when tilting, there is also the problem that it is difficult to sit without using hands, and it is difficult to sit down again. Here, “re-seating” means that the operator once returns to the upright state by lifting the waist from the seat surface and then returns the chair to the lower part of the operator's body and sits down again. Your hands are not allowed to touch non-clean areas in order to keep them clean, and they must be placed at a distance from unclean environments such as the floor. Therefore, the operator cannot grab the seat and tilt it to sit. On the other hand, even if you try to tilt the chair by stepping on the base part, it is easy to move not only in the front-back direction but also in the left-right direction from the upright state, so tilt it toward the operator himself and keep the seat on the operator's buttocks. It is difficult to reliably pull down. For this reason, the operator himself cannot handle the seat with his hands, which requires the help of a medical staff such as a nurse and is very inconvenient, and it is difficult to sit down without the help of staff. is the current situation.

Further, according to the conventional worker posture holding chair for standing work, since the raising/lowering operation lever for controlling the raising/lowering motion of the seat is arranged below the seat surface, the operator himself/herself raises it during operation. Adjustment cannot be made. For this reason, height adjustment requires the help of a medical staff such as a nurse, which is extremely inconvenient.

It is an object of the present invention to provide a worker body posture holding chair for standing work that has high stability when standing and is easy to sit without using hands and to be able to sit down again. Another object of the present invention is to provide a worker body position holding chair for standing work in which the worker himself/herself can perform height adjustment without using hands.

In order to achieve such an object, the invention according to claim 1 is a standing chair for a standing worker, comprising a seat, a support for supporting the support, and a base for supporting the support and giving a restoring force by a built-in weight, base has a side surface formed of a curved body continuous to the bottom and the bottom surface in contact with the floor surface, the horizontal distance to the edge of the base of the upper surface of the edge or et curve end point of the bottom of the curve starting point at the time of a side of the self-supporting There rather long, the length of the front to the length in the horizontal direction, and with the bottom surface of the base is a semicircular flat担面, the vertical axis and a bottom surface and intersects a position passing through the center of gravity position when the bottom surface center , A semicircular portion is developed rearward of an axis in the left-right direction that includes the center of the bottom surface and passes through the center of the bottom surface, and the chord portion passes through a position closer to the center of the bottom surface on the front side than the center of the bottom surface . ..

Further, the invention according to claim 2 is the chair for holding the standing position of the standing worker according to claim 1, wherein the support column is composed of a gas spring with a lock mechanism, and the height adjusting lever tool for pushing down the lock release pin is rotated. The shaft is rotated about its axis, and the rotating shaft is rotated by a lifting operation lever that extends below the elbow of a standing worker .

Further, the invention of claim 3, wherein, in claim 1 or 2 Symbol placement of standing worker Positions holding the chair, the base, that it comprises a wheel for contact with the floor surface when tilted rearwardly Is characterized by.

According to claim 1 the operator Positions held chair standing work described, the base has a side made of a curved body continuous to the bottom surface in contact with the floor surface, the bottom surface of the curve starting point at the side surface of the free-standing edge since the horizontal distance to the edge of the base of the upper surface of the pressurizing et curve end point so that the length of the front is increased with respect to the length in the horizontal direction, high degree of freedom of motion in the range of use of forward, it Other than that, it becomes difficult to move. That is, when the chair is tilted forward from an independent state, it does not require a large force to lean forward with a long horizontal distance, but a large force to lean in the horizontal direction with a short horizontal distance. Since it is necessary, swinging in the left-right direction is suppressed, and it is easy to fall forward substantially straight. Also, even when trying to sit down again, when a worker steps on the front side of the base, the chair that once returned to the self-supporting state by the function of the weight collapses almost straight forward and returns to himself. The seat fits under the buttocks of the worker in the original position or standing position. For this reason, it is not necessary to confirm the position of the single seat or correct the position of the chair, so that it is easy to sit down and the usability is improved. In addition, when the chair is tilted forward, it can be moved in the left-right direction by rolling the curved surface body while still sitting in the standing posture, so there is freedom of movement when sitting in the standing posture. Get higher

In addition, while increasing the degree of freedom of movement of the feet and smoothly operating the foot pedal, etc. while stabilizing the posture of the workers (improving the stability of the trunk) and reducing fatigue of the lower limbs during standing work. can do. As a result, for example, not only the support of an operator (worker) who performs microscopic surgery in a standing position where the movement of the upper limb is small, but also a method of performing endoscopic surgery or catheter surgery in the standing position where the movement of the upper limb is large. It is possible to support the operator, and it is effective in reducing the fatigue of the operator especially during long standing surgery, etc., especially in reducing the load on the lower limbs, and the quality of the operation can be expected to improve.

Furthermore, since the bottom surface of the base is a flat surface, the stability in the self-supporting state is high. Furthermore, when the chair is tilted and used, and when it is restored to the self-supporting state, the amount of shaking and the width of the shaking until it stabilizes can be small. Moreover, since the flat bottom surface including the center of the bottom surface is wide from the center of the bottom surface in the left-right direction and the rear direction, and has a half-moon shape with an extremely narrow area in front of the center of the bottom surface, It is hard to fall down and becomes a gentle curved surface (spherical surface) immediately in the front to easily fall down, and in the state of falling forward, the degree of freedom of movement is high in the range of the front side relaxed curved surface. Therefore, in addition to achieving both stability during independence and freedom of movement during use, when tilting from an independence state, it is possible to prevent swinging to the left and right and facilitate movement only in the forward direction (that is, the operator). It's easy to sit down because it comes back to you.

Further, according to the posture-maintaining chair of the standing worker according to claim 2 , since it is possible to raise and lower the seat by operating the raising/lowering operation lever with the elbow, it is possible to perform a standing work in which the hand cannot be used. It is useful for lifting and lowering the seat. For example, in standing surgery, the surgeon can adjust the height while keeping the hand clean. This eliminates the need to bother other medical staff.

According to the body-position-maintaining chair of the standing worker according to claim 3 , when the chair is moved, if the chair is tilted backward and the wheels of the base material are brought into contact with the floor surface, the weight of the base is reduced. Even if it is heavy, it can be easily transported with a light force by rolling the wheels.

It is a perspective view showing one embodiment of a worker body posture maintenance chair of standing work concerning the present invention. It is a center longitudinal cross-sectional view of the worker body posture holding chair of the same standing work. It is a bottom view of the base and shows the outer base material in a visualized state. It is a center longitudinal cross-sectional view of a base. It is a center transverse cross section of a base. It is the perspective view seen from the outer base material which constitutes a base. It is the perspective view seen from under the outer base material. It is the perspective view seen from above the inner base material which constitutes a base. It is a center longitudinal cross-sectional view explaining a connection relationship between a seat and a support. It is an exploded perspective view of a seat and a support. It is a figure explaining the movement of the worker body posture maintenance chair of the same standing work, (A) is an explanatory view which looked at the self-standing state from the side, and shows the state which leaned forward with a virtual line, and (B) is the self-standing state. It is explanatory drawing which looked at the state from the front. It is a figure explaining the upright operation using the worker body posture maintenance chair concerning the present invention. It is a figure which shows other embodiment of the base of the body position holding chair concerning this invention, (A) is a front view, (B) is a side view. It is a perspective view which shows other embodiment of the structure of a seat of the body position holding chair and the structure of the raising/lowering operation lever concerning this invention. It is a top view of the same position holding chair. It is a right view of the same-position holding chair. It is a partially expanded perspective view which shows other embodiment of the connection structure of the seat and seat receiving member in the body position holding chair concerning this invention. It is an exploded perspective view of a connecting structure of a seat and a seat receiving member.

Hereinafter, the configuration of the present invention will be described in detail based on the embodiments shown in the drawings. In the present specification, the vertical (height), front-back (depth), and left-right (width) directions are defined with the occupant as a reference, and a depth direction (Y axis), a width direction (X axis), and a direction orthogonal to each other are set. The three axial directions of the height direction (Z axis) are defined on the basis that the body supporting surface of each body supporting structure is the XY plane, and the depth direction is defined as being coincident with the front and rear direction of the chair (FIG. 1). reference). Further, as shown in FIG. 3, the front-rear, left-right direction is determined based on the position where the vertical axis passing through the center of gravity and the bottom surface intersect (this position is referred to as the bottom surface center 13 of the base), and the front of the bottom surface center 13 is in front. The direction F is called the rear direction B, the left and right are called the left direction L and the right direction R, respectively.

FIG. 1 and FIG. 2 show an embodiment in which the upright working chair of the present invention is applied to an operator posture holding chair for upright surgery. This operator posture holding chair includes a seat 1, a support 2 that supports the support 1, and a base 4 that supports the support 2 and incorporates a weight 3 to provide a restoring force (a so-called upright spill function).

As shown in FIG. 3, the base 4 has a side surface 10 formed of a curved surface body that is continuous with the bottom surface 11 in contact with the floor surface 14, and the front edge 12a of the bottom surface 11 that is the starting point of the curve when the side surface 10 stands up and other parts. at least in the lateral direction the horizontal distance H _L from the orientation of the edge 12b to the edge of the upper surface 15 of the base 4 as a curve end _point, direction of horizontal distance H _F is provided to be longer before to H _R.

In the present embodiment, the base 4 is a spherical surface having a relaxing curved surface in which the radii of curvature differ between the front direction F and the other directions, that is, the left and right directions L and R, and the back direction B, and the radii of curvature gradually change between them. It is configured. For example, as shown in FIGS. 4 and 5, the upper surface 15 side has a shape in which a semicircle that is concentric with the center of the gas spring with a lock mechanism that serves as the column 2 and a convex shape are connected back to back. The bottom surface 11 is formed as a half-moon-shaped flat surface. The side surface 10 between the top surface 15 and the bottom surface 11 is formed of a curved surface. Further, the bottom surface 11 formed of a flat surface in the shape of a half moon (bow bow) has an arc shape (centered on the bottom surface center 13) where edges 12b in the left-right direction L, R and the rearward direction B pass far from the bottom surface center 13. It has a semicircular shape and spreads in the left and right directions L and R and the rear direction B, and the front edge 12a is provided in a chord shape passing near the bottom surface center 13. Therefore, the horizontal distance from the front edge 12a of the bottom surface 11/flat surface in contact with the floor surface 14 to the front edge of the upper surface 15 of the base 4 (in other words, the curve length on the front side) H _F is equal to that of the bottom surface 11/flat surface. longer to the lateral direction L, (the left-right direction in other words L, curve length of _R-side) horizontal distance from the edge 12b of the R and backward direction B to the edge of the upper surface 15 of the base 4 H L, _{H R} and _{H B} .. In the present embodiment, the horizontal distance _H L of the left-right and rear directions, _{H R} and _H horizontal distance _{H F} forward of to _B is longer relationship _{(H F> H L, H} F> H R, H _{F> H B,} which is the _{H F = H R> H B} ). In other words, the distance from the center 13 of the bottom surface to the front edge (rolling start position/fulcrum) 12a of the bottom surface 11 is short in the front direction F of the base 4, and the bottom surface in the left and right directions L and R and the rear direction B. The distance from the center 13 to the left-right direction and the rear side edge (rolling start position/fulcrum) 12b of the bottom surface 11 is set to be longer than twice. As a result, the radius of curvature of the side surface 10 in the front direction F is large, the radius of curvature of the side surface 10 in the left and right directions L and R is smaller, and the radius of curvature of the side surface 10 in the rear direction B is smaller. In the present embodiment, the horizontal distance H _L in the left-right _direction, but H _R is set to the same length, it is not particularly limited to this, in some cases different length (H _L ≠ H _R) Needless to say,

In the case of a semi-circular base shape as seen in plan view as shown in FIG. 3, one having a long horizontal distance from the edges (rolling start positions/fulcrums) 12a, 12b of the bottom surface 11 to the edges of the base 4 (in other words, the bottom surface). The shorter the horizontal distance from the center 13 to the edges 12a and 12b of the base 4, the larger the moment. Therefore, when the front side of the base 4 is stepped on by the operator, the shorter the horizontal distance is, the smaller the moment is and the more difficult the inclination is, and the longer the horizontal distance is, the larger the momentum is and the easier the inclination is. In other words, the shorter the distance from the bottom surface center 13 that is the center of gravity position in plan view to the edge 12 of the bottom surface that is the rolling start position, the smaller the restoring force (moment caused by the weight) becomes, and the greater the force to tilt. On the other hand, the longer the distance, that is, the larger the restoring force becomes in the left-right direction or the rearward direction, the larger the restoring force becomes, and the larger the force is required to tilt. Therefore, the base 4 easily rolls the side surface 10 of the curved body forward, but it becomes difficult to roll in the left and right directions L, R and backward B. That is, the direction in which the base 4 swings, in other words, the direction in which the support column 2 tilts is limited (guaranteed) to a certain direction. This means that at the same time, the seat 1 is easily guided toward the worker in the standing posture. Further, in the self-standing state, in the upright state in the present embodiment, the posture can be stably maintained by the half-moon shaped bottom surface 11.

Here, as shown in FIG. 7, the radius of curvature of the side surface 10 is formed as a relaxation curved surface that gradually changes from the front F to the left and right sides L and R, but the bottom surface 11 formed of a half-moon-shaped flat surface is used. The front edge (chord) 12a is formed in an extremely gentle arc shape approximate to a straight line, and is provided so that the radius of curvature does not change abruptly in the front range M of about 120° (see FIG. 3). ). As a result, when the chair is tilted forward, that is, when the chair is seated in a standing posture, the front curved surface of the base 4 is made to easily roll in the left and right directions L and R, and the seat is seated around the front tilted position. It is provided so that it can move freely from side to side with its posture.

In the case of the present embodiment, the base 4 is composed of a vessel-shaped outer base material 5 that constitutes an outer shell and an inner base material 6 that fixes the columns 2 and the weight 3, and the inner space 16 of the outer base material 5 is formed. By fitting the inner base material 6 so as to fill the inner base material 6, in other words, the inner base material 6 and the weight 3 are integrated so as to be covered with the outer base material 5. For example, the outer base material 5, the inner base material 6, and the weight 3 are the outer base material 5 and the inner base material 6 and the weight 3 screwed to the lower portion when the outer base material 5 is injection-molded by insert molding. It may be integrally molded by wrapping with, or may be separately molded and assembled. Therefore, the inner base material 6 is basically shaped so as to fit in the internal space 16 of the outer base material 5. Since the inner base material 6 and the weight 3 are covered with the outer base material 5 without any clearance or are inserted, the center of gravity position is changed by the movement of the inner base material 6 and the weight 3 when the chair is tilted. Does not fluctuate. This ensures the force required to restore the standing position of the tilted chair.

Here, the outer base material 5 is made of a non-slip material, for example, a thermosetting resin type elastomer such as urethane rubber, silicone rubber or fluororubber, or a thermoplastic elastomer, or a natural or synthetic rubber (vulcanized rubber). Has been done. On the other hand, the inner base material 6 is not limited to a specific material as long as it is a material having excellent mechanical strength for supporting the seat 1 and the pillar 2 that receives the weight of the seated person, but preferably a reinforced resin such as glass fiber. It is made of polyamide-based resin such as filled nylon, polyacetal (POM), polypropylene (PP), nylon, or a material other than resin, such as iron, aluminum alloy, and stainless steel.

In the case of the present embodiment, the inner base material 6 has a hole 17 through which the axle 8 penetrates in the rear part and a recess 18 into which the weight 3 is fitted in the bottom surface in the case of the present embodiment, and in the center, A through hole 19 for press-fitting the gas spring/support 2 and a step portion 20 for fitting with the outer base member 5 are provided at the peripheral edge on the upper surface side. The lower end of the gas spring 2 is fixed by being pressed into the through hole 19 of the inner base 4. Further, the recesses 18 on the bottom surface into which the weights 3 of the inner base material 6 are fitted are provided with three screw holes at equal intervals in the circumferential direction, and the screw holes are fixed to the bottom surface 11 of the inner base 4 by screwing at three locations. 3 is fixed and integrated. The weight 3 in the present embodiment has a disk shape and is used by stacking two pieces, but the number is not limited to this, and the number, shape, form, etc. may be changed as necessary. It Further, the inner base member 6 side is also provided with a recessed portion 37 that fits into the recessed portion 22 for accommodating the wheel 9 provided in the outer base member 5.

Therefore, in the case of insert molding, the inner base member 6 is preliminarily fitted into the concave portion 18 on the bottom surface of the inner base member 6 by fixing the weight 3 with the setscrew 7 and is integrated into the mold of the outer base member 5. After being set, a thermosetting resin type elastomer or the like for molding the outer base material 5 is injection molded.

When the outer base material 5 and the inner base material 6 are separately molded and then assembled, the outer base material 5 accommodates the inner base material 6 and the weight 3 screwed to the lower portion thereof. An internal space 16 is formed (see FIG. 6). The inner space 16 has substantially the same size and shape as the contour shape when the inner base material 6 and the weight 3 screwed to the lower portion thereof are integrated, and is more than the plane contour shape of the inner base material 6. A slightly smaller similar opening (matching step 20) 21 is provided. The edge 21a of the opening 21 is formed slightly smaller than the internal space 16 that houses the inner base material 6 and the weight 3, and as a result, functions as a flange that covers the stepped portion 20 of the inner base material 6. (See FIGS. 4 and 5). Therefore, the edge 21a of the opening 21 in the upper surface 15 of the outer base material 5 exhibits rubber elasticity when the inner base material 6 is pushed in, and is covered on the inner base material 6 after passing through the inner base material 6. It can be difficult to pull out. Therefore, the inner base material 6 with the weight 3 screwed to the bottom surface is press-fitted (fitted with a static load) into the outer base material 5, or the inner base material 6 and the weight 3 are expanded while the opening 21 is expanded. By inserting and, the inner base material 6 and the weight 3 are housed and integrated in the inner space of the outer base material 5. In the case of such a separable connection structure, the movement characteristics can be changed by preparing various outer base materials 5 having different materials or different outer contour shapes and appropriately combining them. It is possible to respond to various movements and stability required for the chair depending on the content of the standing work. That is, it is possible to easily provide a chair suitable for stabilizing the posture and reducing the burden on the lower limbs for each standing work content.

Further, as shown in FIGS. 3 and 4, the wheels 9 are arranged in the left and right concave portions 22 of the convex rear portion of the base 4. The wheel 9 is provided with a wheel bearing hole 23 that penetrates the axle 8 at a position closer to the upper surface 15 of the base 4 and closer to the rear end, and floats in the air when the chair is in an upright state, and when tilted rearward. It is arranged at a position where it is installed with the floor surface 14. The wheels 9 are rotatably supported by both ends of an axle 8 that penetrates the base 4 (the outer base material 5 and the inner base material 6). For example, in the present embodiment, the axle 8 is provided at both ends with screw holes (not shown) into which the screws 8a for fixing the wheels 9 are screwed, and the flat washer, the wheel 9, the flat bean, and the spring are provided. It is rotatably attached by screwing in screws 8a after fitting it with a washer in order.

The seat 1 is not limited to a particular shape, and preferably has a seat surface shape suitable for sitting in a standing posture. For example, when seated in the upright position, the seat 1 is not seated behind the seat 1. Therefore, a substantially half-moon-shaped seat surface shape as shown in FIG. 1 or a circular or saddle-shaped seat surface shape not shown is adopted. preferable. The half-moon shaped seat 1 of the present embodiment is used by arranging it so that the front has a semicircular shape and the rear has a chord.

In the chair according to the present embodiment, as shown in FIG. 12, since the seat 1 and the pillar 2 are tilted and seated in an upright position, the surface of the seat 1 is made of a material that is hard to slip, or the surface of the seat 1 is It is preferable that it is provided with non-slip. For example, the surface of the urethane seat 1 may be covered with a cover made of a non-slip material such as a silicone net (not shown) to prevent slippage, or the entire seat surface or part thereof may be cork material, urethane rubber, silicone rubber, or fluorine. It may be made of a non-slip material such as a thermosetting resin type elastomer such as rubber or a thermoplastic elastomer, or a natural or synthetic rubber (vulcanized rubber), or a sheet material thereof may be attached. In the case of the present embodiment, the seat 1 is formed of a resin molded product, but the seat 1 is not particularly limited to this, and may be wood such as plywood depending on the case.

As shown in FIGS. 2 and 9, the gas spring forming the support column 2 and the seat 1 are connected via a seat receiving metal fitting 24. The seat receiving fitting 24 is not limited to a particular structure, but in the case of the present embodiment, it is configured by combining two members, for example, a first main spindle mounting bracket 25 and a second main spindle mounting bracket 26. There is.

The first spindle mounting member 25 is, for example, as shown in FIG. 10, a substantially U-shaped steel plate having a flange portion 25a attached to the seat 1, a side wall portion 25b and a bottom wall portion 25c, and is attached to the bottom wall portion 25c. Is provided with a hole 25d into which the vicinity of the bottom of the bearing fitting 27 is press-fitted, and a fool hole through which a set screw (not shown) is passed. Further, the left and right side wall portions 25b are provided with holes 25e through which the elbow rotation shaft 28 passes. Further, the seat 1 is fixed to the flange portion 25a bent outward by a screw. The first spindle mounting member 25 is fixed to the upper end surface of the rotation stopping guide tube 29 supported by the gas spring 2 by a fastening screw (not shown) with the rotation stopping guide plate 30 interposed. The bearing fitting 27 supports the tip of the piston rod 2a of the gas spring 2, and in the present embodiment, is formed in a tapered cylindrical shape having a flange at the bottom.

On the other hand, the second main spindle mounting member 26 is, for example, a U-shaped steel plate and is arranged so that the side wall portions are present in the front and rear, and the bottom wall portion 25c and the left and right side wall portions of the first main spindle mounting bracket 25 are disposed. It is fixed to 25b by welding or the like, and is integrated with the first spindle mounting member 25 so as to form a box shape. A hole 26b is provided in the upper wall portion 26a of the second spindle mounting bracket 26 so as to be concentric with the hole 26d of the bottom wall portion 25c of the first spindle mounting bracket 25 and into which the upper portion of the bearing bracket 27 is press fitted. There is. A back frame pipe 31 is attached to the side wall portion at the rear of the second spindle attachment fitting 26 by welding or the like. Although this back frame pipe 31 can function as a backrest, it can also be used as a carrying handle, and the chair can be tilted rearward until the wheels 9 come into contact with the ground, and then the back frame pipe 31 can be gripped. You can easily move the chair by pulling it or pushing it. A screw hole for turning a set screw for fixing the first spindle mounting bracket 25 to the rotation stopping guide plate 30 is provided in the upper wall portion 26a of the second spindle mounting bracket 26.

In the case of the present embodiment, the raising/lowering operation lever 32 includes a shaft receiving portion (pipe) 32a that is fitted to the elbow rotating shaft 28 and rotatably supported, and a substantially T-shape that extends obliquely rearward from the shaft receiving portion 32a. The lever main body 32b is vertically branched at a position eccentrically rearward with respect to the shaft bearing portion 32a which is the center of rotation, and the elbow of the operator is pressed against the top of the lever main body 32b. A grip-shaped operation unit 33 made of rubber or synthetic resin is provided. The lever body 32b has an L-shape that extends in the horizontal direction diagonally rearward of the seat 1 and is bent upward at the rear of the seat 1, and extends leftward and rightward at the rear portion of the seat 1 to extend below the elbows of a standing occupant. It is provided so that the top is located in the vicinity. According to the support structure (offset structure) of the lifting operation lever 32, by pushing the operation portion 33 backward or downward, the lever main body 32b is moved up and down while rotating the lever main body 32b within the vertical plane about the shaft bearing portion 32a. Can be done. That is, in the elevating operation lever 32, the portion of the operation portion 33 to which the operation force is applied to the shaft bearing portion 32a which is the rotation center is offset to the rear side by removing the vertical axis passing through the rotation center (eccentric in the horizontal direction). Since they are arranged so as to be arranged, the input of the operation force can be applied not only in the horizontal direction but also in the vertical direction downward. Therefore, the lifting operation lever 32 can be easily operated.

The elbow rotating shaft 28 is rotatably supported by interposing an elbow rotating bearing 34 in holes 25e formed in the left and right side wall portions 25b of the first main shaft mounting member 25. The elbow rotating shaft 28 penetrates the side wall portion 25b of the first main shaft mounting member 25 and projects to the outside. The shaft receiving portion 32a of the raising/lowering operation lever 32 is fitted to the elbow rotating shaft 28 outside the first spindle mounting bracket 25, and is fixed to the elbow rotating shaft 28 by screwing or the like. On the other hand, the central portion of the elbow rotating shaft 28 is a D-cut shaft, and the height adjusting lever member 35 is welded to the plane seat portion thereof. The height adjusting lever 35 is projected in the horizontal direction, and is provided at its tip with a height-adjustable protrusion such as a bolt 35a for pushing down the lock release pin 2c of the gas spring 2. Therefore, when the lifting operation lever 32 is pushed down by the elbow, the height adjusting lever tool 35 rotates in the same direction around the elbow rotation shaft 28, and the lock release pin 2c of the gas spring 2 is pushed down by the bolt 35a at the tip. As a result, the gas spring 2 can be expanded and contracted, and when the seat 1 is weighted, the gas spring 2 is displaced in the contracting direction, that is, the seat 1 is lowered, and the seat 1 is not weighted. Due to the gas pressure contained therein, the gas spring 2 is displaced in the extending direction, that is, the seat 1 is raised.

The lower end of the cylinder tube 2b of the gas spring forming the support column 2 is press-fitted into the hole 19 of the inner base material 6 and fixed to the inner base material 6 and then to the base 4. On the other hand, the bearing fitting 27 is attached to the upper end of the piston rod 2a by press fitting, and the upper portion of the bearing fitting 27 has holes 25d in the first spindle fitting 25 and the second spindle fitting 26 of the seat fitting 24, respectively. 26b are respectively press-fitted and fixed.

In the case of the present embodiment, as the gas spring constituting the column 2, a gas spring with a general lock mechanism is used as a chair lifting mechanism. A cylinder tube fixed to the base 4 so that the orientations of the seat 1 and the base 4 in the horizontal plane do not change (so that the front direction F of the seat 1 and the front direction F of the base 4 match). It is provided so that rotation does not occur between 2b and the seat 1. For example, in the case of the present embodiment, as shown in FIG. 10, the rotation stop guide tube 29, which is a square tube, is fixed to the first spindle mounting metal piece 25 of the seat receiving metal piece 24 by screwing, while the cylinder tube A rotation stopper slide block 36 having an angular outer peripheral surface is fixed to the upper end of the rotation stopper guide tube 29 and the rotation stopper slide block 36 so that the rotation stopper guide tube 29 (and thus the seat 1) is attached to the cylinder tube 2b. Is non-rotatably and slidably connected to. The anti-rotation slide block 36 supports the lower part of the anti-rotation guide tube 29 from the inside, and smoothes the anti-rotation guide tube 29 that moves up and down in conjunction with the expansion and contraction of the gas spring 2. A material having good slidability, such as polyacetal, is formed into a ring shape having an inner peripheral surface of a circular shape and an outer peripheral surface of a rectangular shape, and is fixed near the upper end of the cylinder tube 2b by, for example, a screw. At least one, preferably two or more through holes for passing fixing screws are formed in the anti-rotation sliding block 36 in the radial direction.

An anti-rotation guide plate 30 is placed on the top of the anti-rotation guide tube 29, and the anti-rotation guide plate 30 is attached to the first main-axis mounting bracket 25 by a fastening screw that penetrates through the bottom wall portion 25c of the first main-axis mounting bracket 25 to stop the rotation. It is fixed to the guide tube 29. In the case of the present embodiment, the rotation stopping guide cylinder 29 is composed of a cylinder having a non-circular cross section, for example, a square cylinder, and a C-shaped rib 29a serving as a pilot hole for screwing and fastening a tapping screw is formed on the inner wall of the cylinder. ing. The tapping screw can be screwed in by using the space inside the C-shaped rib 29a as a pilot hole for the tapping screw. The rotation stop guide plate 30 is sandwiched between the rotation stop guide tube 29 and the first spindle mounting bracket 25. In addition, a semi-circular hole has a C-shaped rib by milling so that a set screw (not shown) which is threaded through the first main shaft mounting metal fitting 25 passes through the bottom flange portion of the bearing metal fitting 27. It is provided at a position corresponding to 29a.

The anti-rotation guide plate 30 placed on the anti-rotation guide tube 29 is a seat for increasing the contact surface at the top of the anti-rotation guide tube 29 that is fixed to the bottom wall portion 25c of the first spindle mounting member 25. It functions as one piece of gold, and has a ring-shaped outer shape that is rectangular and an inner diameter that is a circular hole that penetrates the bearing fitting 27. Further, two recesses for passing the tapping screws are formed on a part of the circular inner peripheral surface. Therefore, the rotation-stop guide plate 30 overlaps at four corners of the rotation-stop guide tube 29 formed of a square tube so that the two tapping screws do not cause positional deviation, and the rotation-stop guide tube 29 and the first spindle mounting bracket are prevented. It is interposed between the bottom wall portion of 25. A flange at the bottom of the bearing fitting 27 is housed in the hole inside the rotation stopping guide plate 30.

With the above configuration, the rotation of the gas spring 2 is limited, and the positional relationship and angle between the seat 1 and the base 4 are maintained. Therefore, it is possible to receive the buttocks and hold the body position by the seat 1 facing the standing operator while the base 4 is rolled forward and the column 2 and the seat 1 are tilted forward (FIG. 11). (A), see FIG.

Further, in a use state in which the chair is tilted forward and seated in a standing posture, the operator/standing operator is supported by the side surface 10 of the base 4 formed by the curved surface on the front F side. Therefore, the operation of the foot pedal or the like can be performed smoothly while the operator is able to stabilize his/her body posture during standing operation, for example, standing operation, and reduce the fatigue of the lower limbs. Since the side surface 10 of the base 4 that is in contact with the floor surface 14 has a relaxing curved surface extending from the front F to the sides L and R, the base 4 can be freely moved by rolling left and right in the sitting posture. That is, in the use state in which the chair is tilted forward, it is possible to move in the left and right directions L and R by rolling of the curved body while being seated in the standing posture. The freedom of movement is high. Moreover, since the bottom surface 11 of the base 4 is a flat surface, the stability at the time of self-standing is high (see FIG. 11B). Furthermore, when the chair is tilted and used, and when it is restored to the self-supporting state, the amount of shaking and the width of the shaking until it stabilizes can be small. Therefore, the stability is high in the upright state, and the freedom of movement is high in the inclined state (in use).

Further, when trying to sit back on the chair, the waist is lifted from the seat 1 and at the same time, the chair returns to the self-supporting state by the function of the weight 3, that is, in the case of this embodiment, the chair returns to the upright state. In this state, when the front side of the base 4 surgeon's standing posture depresses, chairs lateral direction L, the bottom surface 11 of the hard slope to R (flat surface is long in the lateral, horizontal distance H _L, in other words H _R Since the curve length is short), it falls down almost straight to the front F (the area of the bottom surface 11 from the center 13 of the bottom surface to the front is short and the horizontal distance H _{F, in} other words, the curve length is long) which is relatively easy to tilt. Come back to me. Then, since the seat 1 is placed so as to be drawn into the original position, that is, under the buttocks of the operator in the standing position, the seat 1 can be reseated smoothly. Moreover, since it is not necessary to check the position of the seat 1 one by one or correct the position of the chair, the usability is improved.

Further, since the lock release pin 2c of the gas spring with the lock mechanism can be released by pushing down the lift operation lever 32 with the elbow, the seat 1 can be lifted and lowered without using hands. For example, in standing surgery, the surgeon can adjust the height while keeping the hand clean. This eliminates the need to bother other medical staff. This mechanism is useful in the raising/lowering operation of the seat 1 in the standing work where the hand cannot be used.

Further, according to the body position holding chair of the present embodiment, when the chair is moved, if the chair is tilted backward and the wheels of the base 4 material are grounded on the floor surface 14, the weight 3 of the base 4 becomes heavy. Also, by rolling the wheels, it can be easily transported with a light force.

The above-described embodiment is an example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, the base 4 is provided with the half-moon shaped bottom surface 11 formed of a flat surface so that the posture can be stably maintained in the upright state which is a self-standing state, but the invention is not particularly limited to this. Instead, the flat bottom surface 11 need not be formed, and the upright state need not be the basic form.

That is, the bottom surface 11 of the base 4 does not have to be a completely flat surface as in the above-described embodiment, and may be, for example, an extremely gentle curved surface/spherical surface that approximates a flat surface. For example, although not shown, the bottom surface 11 is a curved surface having the same curvature including the center 13 of the bottom surface, and may be a spherical surface having a curvature radius extremely larger than that of the curved surface of the side surface 10 and approximating to a flat surface. Further, even if the bottom surface 11 is a flat surface, it is not limited to the one that forms a half-moon shape as shown in FIG. 3, and may be a perfect circle in some cases, an elliptical shape or a rectangular shape. It may be polygonal. The horizontal distance from the point of contact with the floor surface 14 to the edge 12 of the upper surface 15 of the base 4 when standing on its own, or the horizontal distance from the edge 12 of the surface to the edge of the upper surface 15 of the base 4 when contacting the floor surface 14 with the surface. There is no reason to limit the contour shape of the bottom surface or the plane shape of the base 4 to a specific shape, as long as the relationship is obtained in which the front is longer than the side. Such a relationship (H _F >H _L , H _R , H _B ) can be ensured by changing the arrangement position of the bottom surface or the plane shape of the base 4.

Further, the base 4 may not have the bottom surface 11 and may be in point contact with the floor surface 14. For example, as shown in FIGS. 13A and 13B, the radius of curvature is different between the front direction F and the other directions, that is, the left and right directions L and R, and the rear direction B, and the radius of curvature gradually changes between them. It is also possible to provide it as a spherical body so as to contact the floor surface 14 at one point (bottom point 40). In this case, the radius of curvature in the front direction F becomes large and becomes gentle with respect to the radii of curvature in the left and right directions L, R and the rear direction B, and the curve length becomes long. It becomes an elliptical shape (oval shape) in which the major axis is arranged toward, and the horizontal distance (or curve) from the bottom point (in the present embodiment, which coincides with the bottom surface center 13) 40 to the edge of the upper surface 15 of the base 4 at the front F. length) _{H F} is the lateral direction and the rear of the horizontal distance (or a curve _length) H L, it becomes longer with respect to _{H R} and _{H B (H F> H L} , H R, H B).

Furthermore, the self-supporting state (basic posture) of the chair is not necessarily limited to the upright state, and can be in the inclined state. For example, by adjusting the position of the center of gravity, the position of the flat surface of the bottom surface 11 of the base 4 is further moved to the front side than when it is upright, and the pillar 2 is tilted in a state where the support pillar 2 is inclined. By providing 11 so as to be arranged, it is also possible to set the tilted state as the basic posture instead of the upright position. Further, it is possible to further incline from this inclined posture or to make it stand upright so that it can be restored to its original position like a rising spill. In some cases, the center of gravity of the base 4 and the position and shape of the bottom surface 11 are the same as those in the above-described embodiment, but only the support 2 and the seat 1 are inclined at an arbitrary angle with respect to the upper surface 15 of the base 4. You may do it.

Further, in the above-described embodiment applied to the standing operation chair, the elevating operation lever 32 is operated by the elbow to move up and down the support column 2 and the gas spring. When the present invention is applied to a chair for purposes other than position surgery, it is possible to perform lifting operation using a body part other than the elbow, such as the hand or foot, depending on the content of the work. For example, an up-and-down operation lever (not shown) may be provided under the saddle in a standing operation in which it is not necessary to keep the hands of the operator as clean as in an operation. Further, even in a standing operation chair, since there are cases where the lifting operation can be performed using the foot, it is possible to arrange a pedal or the like for the lifting operation on or around the base 4. good. In this way, when the lifting operation is performed at the feet, it is preferable to dispose it so that it does not interfere with the foot pedal of the microscope or the electric knife.

Further, the elevating operation lever 32 according to the above-described embodiment adopts an offset structure for vertically raising the lever body 32b at a position which is unevenly distributed rearward with respect to the shaft bearing portion 32a which is the center of rotation, and is provided at the top thereof. Although the elbow rotary shaft 28 is rotated by pushing the grip-shaped operation portion 33 backward or downward, the invention is not particularly limited to this, and the shape of the operation portion or the movement of the elevating operation lever of your choice may be used. You may be able to obtain it. For example, as shown in FIG. 14 to FIG. 16, the operator bends and pulls the elbow while standing to operate the lifting operation lever 32 ′ so as to rotate it backward, so that the column (gas spring) 2 is moved. You may make it go up and down.

In the case of the raising/lowering operation lever 32′ of this embodiment, the offset structure is not adopted, and the shaft bearing portion 32a′ serving as the center of rotation and the vertical lever main body 32b′ standing upward on the side of the seat are along the center of rotation. An operating portion 33′ is provided which is arranged on the same vertical plane and is provided with an operating force in a direction tangential to the rotation trajectory of the top of the lever body 32b′ (see FIG. 16). According to the lifting operation lever 32', the lever main body 32b' is bent upward at both ends of the shaft receiving portion 32a', and is U-shaped when viewed from the front (see FIG. 14) and I-shaped when viewed from the side (see FIG. 16). ) Is formed so as to project to the left and right of the seat 1 on the central axis of rotation, and the apex is disposed near the lower part of the elbow of the standing occupant. That is, the raising/lowering operation lever 32 ′ is arranged so as to cross substantially the center of the seat 1, as shown in FIG. 15, for example. Therefore, the elevating operation lever 32' does not rotate even if a force that pushes down the operation portion 33' acts from above.

The operation portion 33′ in this embodiment is formed in a substantially L shape having a substantially horizontal portion 33h′ and a substantially vertical portion 33v′ as shown in FIG. The horizontal portion 33h' is made to function as a guide for hitting the portion 33v'. Here, it is preferable that the substantially horizontal portion 33h′ of the operation portion 33′ has a shape that follows the movement trajectory of the elbow that swings around the shoulder of the standing worker/operator, for example, as it moves toward the rear side. It is composed of a gentle slope that rises. On the other hand, the vertical portion 33v' against which the bent upper part of the elbow hits is preferably a slope inclined slightly backward, for example, a slope having an inclination angle of about 70 to 80°. Of course, the operation portion 33' may be L-shaped with the horizontal plane and the vertical plane orthogonal to each other. In the raising/lowering operation lever 32' of the present embodiment, the operation portion 33' is arranged at a position close to the body of the operator who is seated, but the present invention is not limited to this. Depending on the use of the chair, the position of the elbow rotating shaft 28 may be changed so that the operating portion 33' is arranged at a position distant from the body of the seated standing worker. Further, the illustrated substantially L-shaped operation portion 33' may be provided at the top of the lever body 32b instead of the operation portion 33 shown in FIG. Even in this case, since the substantially vertical portion 33v′ of the L-shaped operation portion 33′ is present, even if the operation portion 33′ is arranged at a position away from the body of the operator in the standing posture, the operation portion 33′ is substantially vertical. Since the bent elbow hits within the height range of the portion 33v', the operator can operate without having to take a backward warped posture.

According to the elevating operation lever 32' configured as described above, the operator in a standing position can operate without taking a backward warped position. In other words, the operator can operate the elevating and lowering operation lever 32' simply by bending the elbow and pulling it toward the rear of the chair in a natural standing posture. And since the input to the operation unit 33′ is limited to only one direction to the rear of the chair and the operation direction is limited, even if the operator's elbow accidentally touches the operation unit 33′ so as to push it down, The elevating and lowering operation lever 32 does not rotate, and even if it does rotate, it is rare that the lock release pin 2c of the gas spring 2 is pushed down to release the lock. Therefore, unless the operator bends the elbow and pulls it toward the rear of the chair under the explicit intention of operating the lifting operation lever 32', the seat 1 does not move up and down, which increases safety. ..

Further, in the embodiment shown in FIGS. 1 to 10, the relationship between the seat 1 and the base 4 is maintained in a fixed relationship by the interposition of the rotation stop guide tube 29 and the rotation stop sliding block 36, and the seat 1 and the base 4 are maintained. Although the seats 1 are provided so that the directions thereof match, the present invention is not limited to this, and the seat 1 may be rotatably supported by the base 4 in some cases. When the relationship between the seat 1 and the base 4 is fixed, the vibrations that accompany the movement of the base and the rocking on the floor surface are transmitted to the buttocks as they are, so tilt the support column 2 to move the chair. When used, it can move freely depending on the shape of the base portion, but it can be said that there is no user who feels uncomfortable feeling transmitted to the buttocks due to friction between the base and the floor surface. Therefore, for example, if the rotation/oscillation mechanism 38 is interposed between the seat 1 and the seat receiving metal fitting 24 supporting the seat 1 to enable the rotation/oscillation of the seat 1, the base 4 is rotated/oscillated. It is possible to change the posture/direction of the standing worker/operator without doing so.

Here, as the rotation/oscillation mechanism 38, for example, as shown in FIGS. 17 and 18, a lower member 40 fixed to the seat receiving fitting 24, an upper member 39 fixed to the back surface of the seat 1, It is composed of a shaft and a bearing portion that rotatably connect them to each other. The lower member 40 includes, for example, a partition wall portion 44 that is perpendicular to the cylindrical bearing portion 42, and a spring receiving projection 45 that horizontally projects from the partition wall 44 in the left and right directions. On the other hand, on the upper member 39, a pair of spring receiving plate portions are arranged symmetrically with the shaft portion 41 fitted to the cylindrical bearing portion 42 of the lower member 40 and serving as the center of rotation and the partition wall 44 of the lower member 40 being sandwiched. And 47. A compression coil spring 46 is interposed between the spring receiving plate 47 and the partition wall portion 44. The compression coil spring 46 is supported by the lower member 40 by being fitted to the spring receiving protrusions 45 protruding horizontally from the partition wall 44. Further, in the present embodiment, the shaft portion 41 of the upper member 39 and the bearing tubular portion 42 of the lower member 40 are fitted to each other with the flanged sleeve 43 made of a sliding material interposed therebetween, whereby the seat receiving fitting 24 The upper member 39 that supports the seat 1 is swingably supported by the lower member 40 fixed to.

According to the seat rotation/swing mechanism 38 configured as described above, when a force to rotate the seat 1 is applied, the cylindrical bearing portion 42 is compressed while compressing the compression coil spring 46 on the rotation direction side. And oscillates/rotates around the shaft 41 in a certain angle range. When the rotational force applied to the seat 1 is released, the repulsive force of the compression coil spring 46 automatically restores the neutral position (the position where the spring forces of the left and right compression coil springs 46 are balanced). The neutral position is preferably aligned with the front direction F of the base 4.

As described above, according to the body position holding chair of the standing worker described in FIGS. 1 to 10, the movements of the standing worker and the chair user are all determined by the shape of the surface of the base 4 that is in contact with the floor surface 14. When the person tries to change the posture in the left-right direction, the entire chair always moves, but according to the chair of the present embodiment, the posture of the user can be changed without rotating the entire chair by rotating the seat. it can. That is, it is possible to freely move the operator in the left-right direction by rotating only the seat 1 without rolling the base 4 left and right in the sitting posture.

Further, in the above-described embodiment, an operator performing endoscopic surgery or catheter surgery in a standing position, or a microsurgery operation in a standing position or a standing position operation other than the microscopic surgery, including spinal surgery of a neurosurgery. In the above, the explanation was mainly given with reference to an example applied to a surgeon's body position holding chair for standing surgery, which is suitable for stabilizing the posture of the surgeon and reducing the burden on the lower limbs, but the chair of the present invention is limited to these applications. However, it is also suitable for stabilizing the posture of the worker and reducing the burden on the lower limbs in the work in the standing position in various fields. For example, standing work in factories, workshops, sewing work in a standing position, standing meetings for the purpose of shortening time, eating and drinking at restaurants such as so-called standing bars and eating places, fast food restaurants, and around the kitchen. It is possible to provide a chair suitable for stabilizing the posture of a standing worker, a customer, a store clerk, or the like and reducing the burden on the lower limbs in work and the like.

1 seat 2 support (gas spring)
3 Weight 4 Base 5 Outer Base Material 6 Inner Base Material 9 Wheel 10 Side Surface 11 Bottom Surface 12a Bottom Edge 12b Bottom Edge 12b Side and Rear Edges of Bottom Surface 13 Bottom Center 14 Floor Surface 15 Base Interior Space 16 Base Space 28 Elbow horizontal distance from the front edge of the rotary shaft 32, 32 'elevating control lever H _F flat bottom surface to the front edge of the base of the upper surface _{H L,} H _R, from the right and left direction and the backward direction of the edge of the H _B flat bottom Horizontal distance to the top edge of the base

Claims (3)

In a standing posture chair for a standing worker, which includes a seat, a support for supporting the support, and a base for supporting the support and giving a restoring force by a built-in weight,
Wherein the base has a side surface formed of a curved body continuous to the bottom and the bottom surface in contact with the floor surface,
It said forward length a horizontal distance with respect to the length in the horizontal direction to the edge of the edge or et curve end points become the upper surface of the base of the bottom surface as the curve starting point at the time of self-supporting sides rather long,
And the bottom surface of the base is a half-moon-shaped flat surface, and when the center of the bottom surface is the position where the vertical axis passing through the center of gravity intersects with the bottom surface, the left and right sides including the bottom surface center and passing through the bottom surface center. A standing position, wherein a semicircular portion is developed rearward of an axis of the direction and the chord portion passes through a position closer to the center of the bottom surface on the front side than the center of the bottom surface. Chair for holding the position of the worker. The column is composed of a gas spring with a lock mechanism, and a height adjusting lever tool that pushes down the lock release pin is rotated about a rotation shaft, and the rotation shaft extends to the position below the elbow of a standing worker. in rotation operation to way things characterized claim 1 standing worker posture holding chair according. The body position holding chair for a standing worker according to claim 1 or 2 , wherein the base is provided with a wheel that comes into contact with the floor surface when tilted rearward.