JP2016202838A - Work chair with caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an influence imparted on both, even when colliding with a facility, an apparatus, a wall, a person or the like on the periphery of a chair.SOLUTION: In a work chair with a caster for bridging and supporting a body support structure such as a seat part 2 or a waist support part 3 between a pair of right-and-left frames 12 extending in the cross direction, an impact buffer member 34 projecting at least furthermore forward than the front edge of the seat part 2, and functioning also as a grip is provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a work chair. More specifically, the present invention relates to a work chair that includes a caster that enables horizontal movement and in which a seat and a backrest can freely turn.

  In order to make the work chair suitable for use in a small environment, it is desired that the seat is of the minimum necessary size with no wasted space being maximized. In addition, although many work chairs are designed so that work can be performed efficiently, they are not particularly considered for sitting comfort, and are simply formed in, for example, a disk-shaped hard seat. (Patent Documents 1 to 3). For this reason, pressure is applied locally, and if the person sits down for a long time, the buttocks hurt, which may cause a lack of concentration.

  In order to improve this problem, the present inventors, as a working chair suitable for use in a narrow environment, have an elastic structure such as a mesh stretch or a resin shell between a pair of left and right frames extending in the front-rear direction. We have developed a work chair with casters that constitutes a body support structure such as a seat and lumbar support where the tension of the body support surface is maintained by bridging objects and restraining the left and right side edges (only) of them. It was.

Japanese Utility Model Publication No. 03-33628 Japanese Utility Model Publication No. 06-63031 Japanese Patent Laid-Open No. 10-272163

  However, in the case of a swivel chair that constitutes a seat or lumbar support that consists of a flexible body support surface made of a mesh stretch or resin shell between the left and right frames, the end of the frame is the end of the seat or lumbar support Consists of a corner, creating an angular shape. This angular end is the part where the turning radius becomes the largest when the seat rotates, so when moving the chair or surrounding equipment or equipment or rotating the chair seat, the surrounding equipment or equipment or people, etc. There is a risk that the function or appearance of the chair itself or the facility or equipment of the other party that collided may be damaged or damaged. In addition, because it is angular, the impact force is large, and it may be possible to damage the surrounding equipment or make people around you feel painful.

  For example, in an environment where a working chair with a caster that can be used in an operating room is used, it is common to move the chair while sitting or not sitting at the same time. The surrounding facilities, equipment, people, etc. are also moved. And when moving, some of the chairs hit nearby facilities and equipment, walls, people, etc., or other moving equipment, equipment, people etc hit the chair, It may damage the equipment, impair the function and appearance, and hurt the surrounding people.

  An object of this invention is to provide the working chair with a caster which can reduce the influence which it has on both the facilities, apparatus, wall, person, etc. around a chair and which has both.

  In order to achieve such an object, the invention according to claim 1 is a work chair with casters for supporting a body support structure such as a seat portion and a waist support portion between a pair of left and right frames extending in the front-rear direction. In this case, at least a shock absorbing member that protrudes forward from the front end edge of the seat and functions also as a handle is provided.

  In the work chair with casters according to the present invention, it is preferable that the shock absorbing member has a bow shape that hangs down in front of the seat portion, and forms a space in which a hand can enter between the front end edge of the seat portion. .

  In the work chair with casters according to the present invention, it is preferable that the shock absorbing member protrudes forward from the front ends of the pair of left and right frames.

  In the work chair with casters according to the present invention, the impact buffering member is preferably detachable from the frame.

  In the work chair with casters according to the present invention, it is preferable that the shock absorbing member has a core material integrally formed with the frame, and the periphery thereof is covered with the shock absorbing material.

  Further, in the work chair with casters according to the present invention, it is preferable that the shock absorbing member is further provided on either or both of the rear side and the side of the seat portion.

  Further, in the work chair with casters according to the present invention, it is preferable that the shock absorbing member is formed with one or more spaces into which a hand can be inserted between the shock absorbing member.

  In the work chair with casters according to the present invention, it is preferable that an upper portion of the waist support portion is provided with an expansion frame portion that functions as a handle by forming a space in which a hand can be inserted between the waist support portion.

  Furthermore, in the work chair with casters according to the present invention, the body support structure has a seat part and a waist support part that support the seated person, and the seat part stands deep in the seat with the pelvis upright. It has a length L that supports a part of the thigh near the buttocks and the groin, and has a depth length L that is insufficient to support the thigh when sitting on the sacrum. It is preferable to support the seated person's sciatic nodule three-dimensionally only in the region immediately before the lumbar support.

  According to the first aspect of the present invention, the shock absorbing member projecting forward from the front end edge of the seat portion is provided. The impact cushioning member is attached to the equipment, equipment, walls, and people around the chair before the square corners at the front edge of the seat hit the equipment and people around it. Impact can be mitigated by collision. As a result, not only the chair itself, but also the impact of the collision on the equipment, equipment, walls and people around the chair can be reduced.

  Moreover, since the shock absorbing member also functions as a handle, even in a work chair with a caster without a frame on the front side of the seat surface, the front of the chair can be stably controlled by grasping the shock absorbing member, and the chair can be moved and rotated. This reduces the instability of the chair's posture and increases the stability and security during movement and transportation. In addition, since the portion functioning as the handle of the shock absorbing member can be set in a shape and a place where it can be easily gripped, it can be gripped more easily.

  Further, according to the work chair according to the second aspect of the present invention, even if the shock absorbing member is attached, it projects forward so as to hang down below the seating surface. Therefore, it can be used as a work chair with casters that does not have an impact buffer. Moreover, since the shock absorbing member also functions as a handle, when the work chair is moved horizontally or carried, it is easy to grab the shock absorbing member and move the chair.

  According to the work chair according to the third aspect of the invention, since the shock absorbing member projects forward from the front ends of the pair of left and right frames, Even if the rear side of the part hits the front end of the frame, the impact is reduced by the presence of the impact buffering member, and there is little feeling of pain. In particular, it is effective in a working chair having a short front and rear length and a frame on the left and right.

  Further, according to the work chair according to the fourth aspect of the present invention, since the shock absorbing member can be easily replaced, the cost burden is less than replacing the entire chair when the shock absorbing member is damaged. In addition, the shock-absorbing member is detachably attached, so it can be replaced with a shock-absorbing member of different shape, size, and color according to the user's preference and usage environment, or a member other than the shock-absorbing member can be attached. Thus, other functions can be added to the work chair, and the convenience for the user is improved. Furthermore, since it is a separate member from the body support structure such as a frame of the seat where the load (the weight of the seated person) is applied, it can be designed regardless of the body support structure.

  Further, according to the work chair with casters according to the invention of claim 5, the core material has the same supporting rigidity as the frame on the chair body side, and the core material can relieve the impact with an impact absorbing material. The function as a handle can be enhanced while maintaining the impact relaxation function. In addition, by integrally forming with the frame, the manufacturing process and the assembling process can be saved, and the cost can be reduced.

  According to the work chair with a caster according to the sixth aspect of the present invention, since the shock absorbing member is further provided on either or both of the rear side and the side of the seat, the shock mitigating function is provided on the rear and / or side. In addition to being able to spread in all directions, it is possible to grasp the shock absorbing member not only in the front but also in the rear or the side when moving or rotating the chair, and in an easy-to-hold posture You can move the chair.

  Moreover, according to the working chair with a caster according to the invention of claim 7, by passing the cables of the equipment and facilities that move together with the chair through the space (opening) between the seat and the shock absorbing member, Since the cable and the like can be moved together with the chair, it is not necessary for the caster to get over the cable during the movement, and the working efficiency is improved. In addition, restrictions on moving while sitting on a chair are reduced, and workability is improved.

  Furthermore, since a device or clothing to be used can be hooked in the space between the shock absorbing member and the seating surface, a table on which these are placed becomes unnecessary. In particular, in the case of a working chair used in an operating room, when a sterilization covering cloth is put on the lumbar support part, the sterilization covering cloth is provided in the space between the shock absorbing member projecting rearward of the seat part and the seat surface. Since the end portions of the covering cloth can be gathered by inserting the end portions, it is possible to prevent the fall without using a separate restraint tool.

  According to the work chair with a caster according to the invention described in claim 8, the expansion frame that is provided on the waist support part and forms a space in which the hand can enter between the waist support part is provided by the waist support part. It functions as a device that protects the occupant from equipment, equipment, walls, or people located above, but also functions as a handle, so it is possible to easily move or carry the chair by grasping this part. And Further, since it is possible to hook the equipment and clothing used by the seated person in the extension frame or the space inside the extension frame, a table on which these are placed becomes unnecessary.

  Moreover, according to the work chair with a caster concerning the invention of Claim 9, since the depth of a seat surface is short, it cannot sit down in the posture which stepped back and turned. As a result, because the pelvis stands, the spine is kept upright without bending, and the head is straight on the spine without tilting forward, so you can sit well and sit for a long time. Even if it is, it is hard to get tired. In other words, when sitting down, the patient must be seated in a good posture so that the pelvis is raised, and the head weight can easily be led to an appropriate posture on the spine, so that fatigue is reduced. Therefore, it is suitable for use in long-time work, for example, microscopic surgery for several hours to 20 hours. Also, because the seat surface is short and supports a part of the thigh near the groin, the thigh near the knee cannot be supported. Since the foot becomes free, an operation with the foot, such as a pedal operation, can be easily performed. As a result, the operation of the instrument such as the microscope during the operation, for example, the focusing of the microscope, the switch operation, the raising / lowering operation, and the like are all performed with the foot by the pedal operation, so that these operations can be performed accurately and easily.

It is the perspective view seen from the front upper right which shows one Embodiment which applied the working chair with a caster concerning this invention to the operating chair. It is a right view of the chair. It is a front view of the chair. It is the perspective view seen from the back upper left of the chair. It is the perspective view seen from the front upper right which shows one Embodiment of the right-and-left sub-frame which supports a mesh tension place, (A) is a left frame, (B) is a right frame. It is the perspective view seen from the front upper right which shows one Embodiment of the base frame which supports the left and right sub-frame of FIG. It is a perspective view which shows one Embodiment of an impact buffer member, (A) is a front impact buffer member arrange | positioned ahead of a seat, (B) is a rear impact buffer member arrange | positioned at the back of a seat. It is a disassembled perspective view which shows the relationship between the seat support frame shown by removing the mesh tension fabric which is a member which comprises the body support surface of the chair, a waist | hip | lumbar part support support frame, and the front and back impact buffer members. It is a top view which shows other embodiment of the body support structure of the chair, and removes the mesh tension fabric which is a member which comprises a body support surface, and shows. It is a perspective view which decomposes | disassembles and shows the structure of the seat support frame of the body support structure of FIG. 9 with a sub-frame and a base frame. It is a perspective view which shows other embodiment of the body support frame of the working chair with a caster concerning this invention, and shows only a seat part and a waist | hip | lumbar part support part. FIG. 12 is a perspective view showing a base frame and a waist support frame by removing a mesh stretch that is a member constituting the body support surface of the chair of FIG. 11. It is a perspective view which shows the sub-frame of the chair of FIG. It is a top view which shows other embodiment of the seat part of the operating chair concerning this invention. It is a perspective view which shows the seat part and waist | hip | lumbar part support part of the surgery chair concerning embodiment using the resin-made shell as a member which comprises a body support surface. It is a top view of the seat which shows other embodiment at the time of using a mesh tension fabric as a member which comprises a body support surface. Enlarged view of the seating surface that consists of a region where mesh stretch is difficult to stretch (low stretch region) and a region that stretches easily (high stretch region) by changing the knitting structure (knitting method) in the middle Furthermore, (A) is a high stretchable region, (B) is near the boundary, and (C) is a magnified view of the low stretchable region.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings. In the present specification, the vertical (height), front / rear (depth), and left / right (width) directions are determined based on the seated person, and the depth direction (Y-axis), the width direction (X-axis), The three axial directions in the height direction (Z-axis) are defined on the basis that the body support surface of each body support structure is the XY plane, and the depth direction is defined as being coincident with the longitudinal direction of the chair.

  1 to 4 show an example in which the present invention is applied to a surgical chair on which a surgeon sits during surgery as an embodiment of a working chair with casters according to the present invention. This surgical chair is a swivel chair with casters provided with a seat portion 2 and a waist support portion 3 that form a body support surface that supports the body of a surgeon (sitting person) by means of a mesh upholstery 1. In this embodiment, the seat part 2 and the waist | hip | lumbar part support part 3 are integrally formed continuously by the mesh tension fabric 1 which is a member which comprises a body support surface. In addition, the lifting device (gas cylinder) built in the support column of the leg part arbitrarily steps the valve 2 of the gas cylinder by stepping on the annular operation plate 6 provided at the bottom part to operate the seat part 2 and the waist support part 3 arbitrarily. It is provided so that it can be moved up and down.

  The seat part 2 is shorter in the depth direction than a conventional general seat having a depth dimension sufficient to support the thighs near the buttocks and knees, and sits deep in the seat with the pelvis upright. The length of the thigh and the length of the thigh near the groin is supported, and the length of the thigh is lost or insufficient when sitting on the sacrum. In other words, when the seated person sits deep in the seat so that the pelvis stands with the lumbar part placed on the lumbar support part 3, the thigh near the pelvis is supported by the seating surface and the thigh near the knee is supported. It has a length that can support the front part so that it can move freely. In general, according to chair recommended dimensions (published by the Human Life Engineering Research Center of Japan), the depth dimension of the seating surface is preferably in the range of 360 mm to 460 mm. In particular, it is said that 410 mm is preferable.However, according to the chair of the present embodiment, it is possible to realize a seat surface that can be easily guided to an appropriate posture by deliberately setting the depth dimension of the seat portion 2. In other words, the seat portion 2 of the present embodiment has a seat surface depth dimension shorter than the recommended chair size described above (from the backrest point to the front end). For example, the depth of the seating surface is in the range of 150 mm to 350 mm, preferably in the range of 250 mm to 350 mm. In this way, the seating posture is more correct when the seat is placed deeper than the sacral sitting, rather than the sacral sitting, by reducing the depth of the seating surface. Therefore, it is difficult to get tired even when sitting for a long time, especially when taking a long sitting posture, such as surgery, a chair that reduces fatigue is necessary. Because the center of gravity is in front, the entire hips tend to be shallow, and the chair that uses the backrest tends to tilt the trunk backwards. Otherwise, the pelvis collapses, the lumbar vertebra is curved, the spine is curved, and the head is easily tilted forward, so the posture may collapse before long, so-called sacral sitting. The pelvis It leans backwards, the spine is curved and becomes round, and as a result, the head tilts forward and puts a heavy burden on the muscles, causing muscle fatigue and feeling fatigued, which can cause you to sit for a long time Therefore, it is a chair that does not take the sacral sitting posture and has set the depth dimension of the chair that can not be seated properly unless the posture is correct. The seat portion 2 having a unique seating surface shape that is easy to guide the posture of sitting with a standing bone bone nodule is also useful in other chairs that do not include casters and other fixed chairs.

  Here, it is preferable that the body support surface (so-called seat surface) of the seat portion 2 has a structure that is difficult to slip on the entire surface or a part thereof. A part of the seating surface may be around the buttocks of the seated occupant (the back of the seating surface) or around the thigh of the seated occupant (the front of the seating surface). Furthermore, a non-slip structure only at the waist may be used. If the seat surface is provided with a non-slip function and is not slippery, the seat bone nodule will slide forward and the pelvis will not tilt backwards if the seat is seated in a good posture so that the pelvis is raised when sitting. Therefore, since the entire pelvis is firmly supported by the seating surface and the lumbar support surface and can be supported in three dimensions so that the sciatic nodules do not slip forward, the posture of the head on the spine can be maintained, Fatigue does not accumulate, and even when sitting for a long time, it is difficult to get tired. Moreover, even if the user does not sit down with his pelvis standing up all the time, his posture will not be lost and so-called sacral sitting will not occur. In other words, even if the seat has a short depth, if the occupant has a structure that prevents slipping, the forward slip does not occur, so that the posture of sitting with a sciatic nodule can be maintained. In this specification, the non-slip structure means that the material has a high coefficient of friction on the tension material or shell of the material because of consideration of shape or by using a material that does not slide on the tension material itself. In addition to the combination of stretched and non-stretched stretches, it includes slip prevention by protrusions, slip prevention by rubber and other high friction coefficients, and the like.

  For example, as shown in FIG. 1 and FIG. 2, the seat surface (body support surface of the seat) in the present embodiment is a transition portion from the pelvis of the seated person to the thigh in the side view and A region having a vertex 7 in the vicinity of a relatively round boundary line (called a ridge groove) in the form of a pleat, and mainly supporting the buttocks inclined downward from the vertex 7 toward the rear of the seating surface (hereinafter referred to as the rear portion) (Referred to as a region) 9 and a region (hereinafter referred to as a front region) 8 that supports a part of the thigh near the groin that is inclined or curved forward and downward from the apex 7. Therefore, while supporting the back of the thigh near the groin so as not to be compressed, the rear region 9 has a function of preventing front slip. That is, the seat portion 2 of the present embodiment has a depth length L that is convexly curved upward and has a short length that supports a part of the thigh and the thigh near the groin, and the rear region 9 is Since the area of the thigh is limited to the area just before the lumbar support section 3 and the thigh support is limited to the vicinity where it is connected to the ischbone, the seated person must sit in a good posture so that the pelvis is erected when sitting. It will be. In addition, since the rear region 9 that tilts backward has a function of preventing forward slip, the sciatic nodule slips forward and the pelvis does not tilt backward. In other words, the posture does not collapse and the so-called sacral sitting does not occur. Therefore, the entire pelvis can be firmly supported by the seat surface and the lumbar support surface, and can be three-dimensionally supported so that the sciatic nodules are not displaced forward. The position of the vertex 7 is set to about 200 mm from the position of the backrest point (position on the vertical line). In the case of the present embodiment, since the seat surface depth dimension is about 300 mm from the backrest point, the apex 7 exists at a position about two-thirds. Incidentally, the sitting reference point is located at a position of about 100 mm from the position of the backrest point (position on the vertical line), and is located approximately at the midpoint between the vertex 7 and the backrest point. Therefore, it can be said that the sitting reference point is at a position where the mesh stretch 1 is most easily extended. Here, the sitting position reference point is a point that determines the height of the seating surface of the chair, and is located at the center of the left and right seat bone nodules (the part protruding below the pelvis and supporting the weight in the sitting position) Is a point. In general, a vertical distance from the floor surface to the sitting position reference point is defined as a seating surface height. The seating position reference point of the chair of the present embodiment is set in a range of, for example, 100 to 150 mm from the backrest point, and the seating surface height is a height of 400 mm from the floor surface in a normal position, and in a range of 150 mm upward. It is preferable that adjustment is possible.

  Moreover, in this embodiment, the non-slip function and the sciatic nodule are more effectively applied to the seat surface by tensioning the seat surface of the rear region 9 behind the apex 7 so as to form the heel 10 that extends in the front-rear direction. The function to hold in three dimensions is given. For example, as shown in FIGS. 2, 5, 13, and 10, by forming corrugated irregularities 19 on the stretched surface (upper surface) 18 of the subframe 12 that supports both side edges of the mesh stretched fabric 1, On the mesh stretch 1 that is stretched between the two frames 12, ridges 10 having corrugated irregularities are formed in the front-rear direction along the corrugated irregularities 19 of the stretchable surface 18 (referred to as corrugated). Where the heel 10 is provided on the mesh tension fabric 1, the tension in the lateral (width) direction is the same, but the heel 10 expands and extends in the depth (front and rear) direction, so compared to a flat seat surface portion. This increases the amount of elongation in the front-rear direction. Therefore, if the same weight is applied simultaneously to the seat surface portion having the heel 10 and the seatless surface portion, the seat surface portion having the heel 10 will sink more. That is, the rear region 9 that supports the seat bone and is easy to actively sink is provided immediately in front of the lumbar support portion 3 to guide the pelvis to be seated. At the same time, the front region 8 in front of the seating surface, which has a relatively small amount of elongation compared to the rear of the seat, can be used as a pawl to prevent the front of the buttocks from sliding. For this reason, it is possible to hold the sciatic nodule three-dimensionally and to prevent forward displacement, and to prevent so-called sacral sitting, and to easily lead to an appropriate posture even if sitting for a long time. Furthermore, since the seat surface part is comprised by the mesh tension fabric 1, the air permeability as a seat is ensured and the stuffiness in the sitting state is lost. For this reason, the sitting comfort which can endure long-time operation is obtained. The seating area of the surgeon who is the seated person is supported by dispersing the weight over the entire surface. A comfortable and comfortable body support surface.

  The rear end of the seat 2 is provided with at least a waist support portion 3 that supports the waist. In the present embodiment, the lumbar support portion 3 includes a lumbar support frame 23 and a mesh stretch 1 stretched so as to cover the front side of the lumbar support frame 23 and is formed on the outer surface of the lumbar support frame 23. The locking member 24 sewed on the periphery of the mesh tensioned fabric 1 is also fitted to the tensioned groove attaching groove 21 so that the edge of the mesh tensioned fabric 1 is folded back and fitted to be fixed while applying tension. The waist support portion 3 is preferably formed so as to be narrower than the width of the seat so that it does not hit when the elbow, which is the sterilization region of the seated person / surgeon, is moved backward. In this case, the surgeon's elbow / sterilization zone will not touch and the sterilization will not be lost. Specifically, for example, the width of the waist support portion 3 is preferably within 350 mm.

  Further, the waist support height (the height from the seat surface to the backrest point) of the waist support portion 3 is preferably set 200 mm above, and the waist support height (from the seat surface to the upper end of the waist support portion 3) is preferably set. As long as it can support the backrest point, it is not particularly concerned with its height. Therefore, in the present embodiment, the height is set to 300 mm from the seat surface, but depending on the case, there is no problem even if it is set a little higher or lower. Since the lumbar support part 3 supports the pelvis, it can prevent the pelvis from being tilted backwards and the lumbar dorsum of the lumbar vertebrae, and can prevent sacral sitting in combination with the prevention of forward displacement caused by the sinking of the part supporting the buttock. Since the posture is difficult to determine in a seat that does not support the lumbar region, the lumbar curvature variation is large, but by supporting the lumbar region, the rear position of the pelvis is regulated and the seat surface is short, so it can be seated shallowly Because there is no, you will have to sit upright. Therefore, it is possible to sit in a good posture and not to get tired. As shown in FIGS. 2 and 10, the lumbar support portion 3 forms a curved surface such that the central portion in the height direction protrudes most forward, and the pelvis and lumbar spine of the surgeon who sits on the pelvis Construct a curved surface to hold. In this case, the waist support portion 3 is slightly curved forward in the Y-axis direction, and is linearly formed in the X-axis direction.

  An expansion frame portion 36 is provided on the upper portion of the lumbar support portion 3 as necessary so as to form a space 50 in which a hand can be inserted between the lumbar support portion 3 and function as a handle (grip). In the case of the present embodiment, the expansion frame portion 36 is integrally formed with the waist support frame 23 (the left and right frames 23a) of the waist support portion 3, so that the mesh stretch 1 of the main portion support portion 3 is stretched. A solid handle having rigidity as a body support structure is formed with a space 50 surrounded above the (lumbar support surface). In some cases, the extended frame portion 36 may be attached to the waist support frame 23 with an independent handle part by screws or the like. Further, the extension frame portion 36 may be made of nylon (polyamide synthetic fiber), polypropylene (PP), or the like in some cases in order to alleviate the impact when coming into contact with a wall or equipment that protrudes near the upper end of the waist support portion 3. You may make it give an impact buffering function by forming with a plastic material or rubber | gum rich in elasticity, such as elastomer resin. In any case, the presence of the extension frame portion 36 protects the seated person from equipment, equipment, walls, people, etc. located above the waist support portion 3 regardless of the presence or absence of the shock absorbing function on the material. Will function as.

  On the other hand, at the periphery of the seat portion 2, there is provided an impact cushioning member that protrudes outward from at least the seat portion 2 and functions as a handle. For example, in the present embodiment, the shock absorbing member needs to protrude forward from the front end of the frame of the seat or rearward from the rear end of the frame, and as shown in FIGS. An impact buffer member (hereinafter referred to as a front impact buffer member) 34 protruding forward and an impact buffer member (hereinafter referred to as a rear impact buffer member) 35 protruding rearward are provided. Here, in the work chair where the seat cushion often moves the foot while the seated person is seated, the shock buffer member relaxes the impact even if the rear side of the thigh hits the front end of the frame, and feels less pain, It is preferable to be disposed at least in front of the seat portion 2 (front shock absorbing member 34), more preferably to be disposed in front and rear (front shock absorbing member 34 and rear shock absorbing member 35), respectively. Although not shown, in some cases, instead of or in addition to the rear impact buffering member 35, an impact buffering member projecting to the side (hereinafter referred to as a side impact buffering member) may be provided.

  The impact buffer members 34 and 35 are intended to alleviate damage caused by collisions between the chair body and the frame structure before they collide with surrounding equipment and devices and people. In particular, it is preferable that it protrudes greatly outside the seat part 2, but on the other hand, there is a demand for a seat of the minimum necessary size suitable for use in a narrow environment, as well as surrounding equipment, devices and people. From the viewpoint of avoiding unnecessary buffering, it is preferable to reduce the protruding amount. In other words, it is preferable to set the minimum amount of protrusion that can exhibit a sufficient impact mitigating function. In particular, the working chair of the present embodiment is intended to realize a seat surface that can be easily guided to an appropriate posture by deliberately setting the depth dimension of the seat portion 2, and thus its shape characteristics are impaired. In order to avoid this, it is desirable that the shock absorbing member 34 installed on the front side of the seat protrudes from the front edge of the tension as much as possible without interfering with the legs of the seated person. Therefore, as shown in FIGS. 2, 7A, and 8, the front shock absorbing member 34 of the present embodiment has an arcuate shape that droops drastically in the process of moving away from the attachment points at both ends to the frame structure. In other words, it has an arcuate shape when viewed from the top and a central portion that hangs down when viewed from the side so that it does not interfere with the seated person's legs even though it protrudes greatly ahead of the front edge of the seating surface. Considered. At the same time, the front shock-absorbing member 34 has a handle shape that is easy to grip so as to form a large space 42 in the middle most away from the seat portion 2. On the other hand, the rear shock absorbing member 35 is disposed behind the seat portion 2 and does not interfere with the legs of the seated person, so it is formed in an arc shape that protrudes rearward substantially horizontally. It is not particularly limited. The rear shock absorbing member 35 preferably surrounds the support 23c of the lumbar support frame 23 and protrudes rearward at the same position as the upper end of the lumbar support portion 3 or slightly behind it. The rear shock-absorbing member 35 protrudes rearward slightly from the extended frame portion 36 in the orthogonal projection seen from above.

  The front impact cushioning member 34 and the rear impact cushioning member 35 are detachably fixed to the subframe 12 that supports the mesh tensioned ground 1 using fastening screws 39 or the like. For example, as shown in FIGS. 5 and 7, projecting pieces 37 projecting in the front-rear direction from the front end and the rear end of the subframe 12 are fitted to both end portions of the front and rear impact buffer members 34 and 35, respectively. A concave portion 38 is provided for accommodating. A hole 40 having a hexagonal shape is formed in the protrusion 37 of the subframe 12, and a nut (not shown) is fitted into the hole 40 so as not to rotate. The projecting piece 37 of the sub-frame 12 and the recess 38 at the end of the shock absorbing member 34, 35 are fitted (indicating joint), and a screw 39 is screwed from the side hole 41 to be fastened to the nut of the projecting piece 37. Thus, the shock absorbing members 34 and 35 and the protrusion 37 of the subframe 12 are fixed. Of course, the relationship between the projecting piece 37 and the recessed portion 38 may be reversed, and the projecting piece 37 may be provided on the impact buffering members 34 and 35 side, while the recessed portion 38 may be formed on the subframe 12 side. Moreover, depending on the case, it is not restricted to the fastening by the screw | thread 39 and the nut which is not shown in figure, You may make it fix both by press injection. For example, the recess 38 is formed in one of the front and rear ends of the sub-frame 12 or the end of the shock absorbing members 34 and 35, and the other has a relationship that has a slightly larger margin than the recess 38 described above. A piece 37 may be provided, and the protruding piece 37 may be fixed by being pressed into the recess 38. Further, although not shown, a projecting piece having a claw is formed on one of the end of the sub-frame 12 and the end of the shock absorbing member 34, 35, and the end of the shock absorbing member 34, 35 or A hole or a recess for fitting the above-mentioned protruding piece to the other end of the subframe 12 and hooking the claw may be provided, and the protrusion may be fixed by inserting the protruding piece into the hole and hooking the claw. . In this embodiment, the front and rear impact buffer members 34 and 35 are attached to the front end and the rear end of the subframe 12, respectively. However, the present invention is not limited to this, and it may be directly attached to the base frame 11 as necessary. May be.

  The shock absorbing members 34 and 35 are preferably protruded forward or rearward from the ends of the left and right subframes 12 constituting one corner of the seat end. That is, when the seat turns, the corner portion becomes the maximum radius portion, and it is desirable that the portion is directly protected by the shock absorbing members 34 and 35. In particular, in the case of the front shock absorbing member 34, it is preferable that the front shock absorbing member 34 is projected directly forward from the front end of the subframe 12. In this case, even if the rear side of the thigh hits the front end of the subframe 12, the shock is applied. The presence of the buffer member 34 has an effect of less feeling pain. This is particularly useful in a working chair that has a short seat front and back, a frame on the left and right, and often moves a foot.

  The impact buffer members 34 and 35 in the present embodiment have sufficient mechanical rigidity such as nylon (polyamide synthetic fiber), polypropylene (PP), a plastic material having a high elasticity such as an elastomer resin, or a resin or metal containing rubber or glass fiber. For example, an arcuate member formed of a material provided with, and both ends thereof are detachably attached to a highly rigid frame structure that supports the mesh tension fabric 1 of the seat 2. Here, the method of fixing the impact cushioning member to the chair body is not limited to the above-described screw type, other fastening methods may be employed, and the fixing method may be the same in all locations, or You may change a dimension and a shape for every attachment location so that an attachment location may not be mistaken. Furthermore, the shock absorbing member may be attached to all locations on the frame. In the case where the shock absorbing members 34 and 35 are formed of a material having sufficient mechanical rigidity such as glass fiber-containing resin or metal, for example, urethane elastomer, olefin elastomer, styrene elastomer, polyester elastomer and It is preferable to provide an impact mitigation function by covering with a soft resin such as soft vinyl chloride or an impact absorbing material (not shown) such as foamed plastic. The impact absorbing material is not necessarily limited to the above-described materials, and various elastic bodies that can absorb the impact can be used. For example, it is preferable to use a low resilience elastic foam which is a kind of flexible urethane foam and has improved elasticity by suppressing elasticity. The low resilience foam also has characteristics as a shock-absorbing foam having a large hysteresis loss rate (JIS K 6400-2). When the external force is removed after air bubbles are connected and compressed, it has the property of slowly returning to its original form, and its rebound resilience is about 15% or less (JIS K 6400-3), which is very small compared to general foam. It has characteristics. In some cases, impacts may be structurally mitigated, for example, by adopting locally inferior mechanical rigidity or a spring structure region. In addition, even when the shock absorbing members 34 and 35 are formed of a material having sufficient mechanical rigidity such as glass fiber-containing resin or metal, as long as it forms a curved surface, peripheral devices or people, or It does not necessarily have to be covered with a shock absorbing material since it does not damage the occupant.

  Further, although not shown, the shock absorbing members 34 and 35 may be integrally formed with the subframe 12 depending on the case. In this case, since the sub-frame 12 is required to have rigidity as a structure that supports the mesh tension fabric 1, it is made of a material having rigidity such as glass fiber-containing resin or metal. Covering with the above-mentioned impact absorbing material as a core material, for example, covering with a sheath member such as foamed urethane, applying two-color molding or foaming resin, and foaming, etc., can ensure impact buffering properties. In other words, the shock-absorbing member itself does not need to be formed entirely of a material having high elasticity, and depending on the case, it may be integrated with the frame or retrofitted (not only joined but also bonded, such as being bonded). In some cases, a foamable coating such as a urethane foam sheath may be put on the outer side of the rigid material (including a foamed layer), or such a foamed layer may be formed on the surface. In addition, as another part described above, as in the case where the shock absorbing members 34 and 35 are formed of a material having sufficient mechanical rigidity such as glass fiber-containing resin or metal, if the curved surface has a curved surface, It does not necessarily have to be covered with a shock-absorbing material because it does not damage the equipment, people or seated persons.

  Further, it is preferable that the rear shock absorbing member 35 protrudes slightly below the waist support portion 3 so as to hit the surrounding equipment or a person before the waist support portion 3. For example, when using surgery, the surgeon does not want the elbow to hit the back. Because the elbow passes over the patient, it is necessary to maintain sterility. Therefore, it is desirable to cover the back by covering the back with a sterilization cloth on the waist support part 3 of the chair. However, when a general rectangular sterilization cloth is used, the terminal processing is required. That is, it is necessary to bind the cloth terminals so that they do not get in the way and fix them to the chair. Therefore, the sterilized cloth can be held together using the space / opening 42 of the rear shock absorbing member 35.

  Further, it is sufficient that the impact buffering members 34 and 35 protrude at least outside the chair-side structural member, for example, the frame 12 of the seat portion 2. However, the impact buffering members 34 and 35 can ensure sufficient shock buffering and function as a handle. In order to function as a clip or the like for collecting the sterilized cloth, a space (including not only an opening but also a notch or the like, hereinafter simply referred to as a space) is provided between the shock absorbing members 34 and 35 and the chair body side member. 42 is preferably formed. Specifically, in the case of the shock absorbing members 34 and 35, a space 42 in which at least a hand can enter is formed between the front end edge of the seat portion 2 or the mesh stretch 1 near the boundary between the seat portion 2 and the waist support portion 3. The shock absorbing members 34 and 35 are provided so as to be used as handles. The shock absorbing members 34 and 35 can always exhibit a buffering function without providing a gap 42 between the shock buffering members 34 and 35, but providing the space 42 facilitates deformation of the shock absorbing members 34 and 35 themselves. In addition to increasing the shock absorbing function, it can be used as a handle, which is preferable. In the case of the present embodiment, the shock absorbing members 34 and 35 are formed in an arch shape so as to form one space / opening 42. You may make it form a part and a notch. That is, instead of the arch-shaped impact buffer member as shown in the drawing, it may be an impact buffer member provided with at least one space 42 serving as a handle.

  The mesh stretch fabric 1 is attached to the frame (subframe 12 and base frame 11) configured as described above, for example, the edge of the mesh stretch fabric 1 is folded back together with the locking member 24 to the outer surface of the subframe 12. The legs of the subframe 12 are inserted into the grooves 45 of the base frame 11 while the left and right subframes 12 are mechanically pulled in opposite directions while being fitted in the formed tensioning groove 21 (see the enlarged view of FIG. 4). 48 is fitted, and the recesses 46 and the legs 48 on the subframe 12 side are hooked on the locking claws 43 and 44 and then screwed (see FIG. 8). A screw (not shown) is screwed into the screw hole 49 of the claw 43 on the base frame 11 side through the flaw hole 47 and fixes the sub frame 12 and the base frame 11 in a state where tension is applied to the mesh tension fabric 1. In the case of this tension structure, it is necessary to fit the subframe 12 to the base frame 11 in a state where the mesh tension fabric 1 is pulled. Therefore, a special jig or the like is required. Tension can be applied. Thereafter, the concave portions 38 of the front shock absorbing member 34 and the rear shock absorbing member 35 are fitted into the protrusions 37 at the front and rear ends of the subframe 12 and fixed with screws 39.

  The above-mentioned mesh tension 1 is attached to the frame using a separate facility or jig, but is not particularly limited thereto. For example, by providing a tension applying structure on the frame side of the chair body, The chair user may be able to easily replace the mesh tension as necessary. For example, in this embodiment using a mesh tension as the member 1 constituting the body support surface, as shown in FIGS. 9 to 13, simultaneously with applying tension to the mesh tension 1 by expanding the frame structure in the width direction. It is good also as a structure attached to a chair main body. The front and rear ends of the subframe 12 are provided with projecting pieces 37 for fitting and fixing the front shock absorbing member 34 and the rear shock absorbing member 35.

  Specifically, the mesh tension structure includes a base frame (fixed frame) 11 supported by a gas spring (not shown) of the pedestal 5, and a groove that is fitted together with the locking member 24 by folding the edge of the mesh tension ground 1. A pair of left and right subframes (movable frames) 12 having 21 on the side surface, and fastening means 13 for supporting and connecting the subframe 12 to the base frame 11 so as to be movable in the tensioning direction of the mesh tensioned ground 1. The mesh upholstery 1 is detachably attached between the left and right subframes 12 by folding the edges of the mesh upholstery 1 together with the locking members 24 and fitting them into the grooves 21 of the subframe 12. In this mesh-stretching structure, when the subframe 12 is connected to the base frame 11, the distance between the left and right subframes 12 is expanded, and tension is applied to the mesh stretched ground 1 fitted in the groove 21 on the side surface of the subframe 12. Accordingly, the mesh tension fabric 1 is fixed so as not to come off from the groove, and is provided so as to constitute a body support surface that exhibits a desired elasticity. The locking member 24 is attached to the edge portion of the mesh tension fabric 1 and is caught in the tension fabric attachment groove 21 by the tension of the mesh tension fabric 1 when fitted in the tension fabric attachment groove 21 outside the frame. By functioning as a retaining stopper, the upholstery is fixed to the waist support frame 23. As the locking member 24, any material can be used as long as it has a certain degree of hardness and has a plasticity that can be bent. It is preferable to use a resin cord formed of polypropylene or the like. Moreover, depending on the case, without using the locking member 24, the mesh tensioned fabric 1 may be simply fitted back into the tensioned fabric attaching groove 21 and fixed.

  Here, the sub-frame 12 is mounted on the box-shaped base frame 11 so as to be horizontally movable while supporting the stretched-hung portion 14 having a groove into which the edge of the mesh-hung fabric 1 is fitted. The support arm portion 15 is supported so as to be slidable in the width direction of the seat in a state where the upholstery hanging portion 14 is arranged so as to protrude outside the base frame 11. The base end portion of the support arm portion 15 includes a slider portion 16 that is in sliding contact with the upper surface of the base frame 11, and a nut portion 17 that is inserted into a guide hole 20 that is opened on the upper surface of the base frame 11. Two nut portions 17 projecting from the back surface of 16 are inserted into two guide holes 20 opened on the upper surface of the base frame 11, and fastening screws 13 passing through the through holes 22 on the side walls of the base frame 11. Are coupled to the base frame 11 so as to be screwed together. The guide hole 20 of the base frame 11 is used to insert the nut portion 17 of the slider portion 16 of the subframe to restrict the rotation of the nut portion 17 and restrict the movement range. The subframe can be moved within the range. Therefore, when the fastening screw 13 is tightened, the nut portion 17 protruded from the back surface of the slider portion 16 of the subframe inserted into the sliding hole of the base frame 11 is relatively rotated so that the side wall of the base frame 11 Move it toward you. Then, by clamping the side wall of the base frame 11 with the fastening screw 13 and the nut portion 17, the fastening of the subframe 12 and the base frame 11 is completed, and at the same time, the tensioning of the mesh tension fabric 1 is completed. . That is, the base frame 11 and the subframe 12 are connected while using the fastening screw 13 as a feed screw of the screw feed mechanism. At this time, the sub-frame 12 is attracted by the fastening screw 13 from the inside to the outside in the seat width direction, so that the interval between the stretched portion 14 of the left and right sub-frames 12 is displaced in the expanding direction. Therefore, the mesh tension fabric 1 having both edges fitted in the grooves 21 of both the subframes 12 is pulled outward in the width direction to be tensioned.

  The left and right subframes 12 are independent from each other, and the respective slider portions 16 are slidably mounted on the base frame 11. And the frame structure for supporting the mesh tension fabric 1 is not provided in the front edge part of the sub-frame 12. FIG. That is, there is no reinforcing member at the front edge of the mesh tension fabric 1, and the front edge of the mesh tension fabric 1 is in a relaxed or stretchable state. In this case, the thigh is less likely to feel a pressure at the front edge of the mesh stretch 1. Therefore, leg numbness caused by the back side of the thigh being pressed by the front edge of the mesh tension fabric 1 is less likely to occur, and the movement of the foot is also free. In the present embodiment, a groove for folding and fitting the edge of the mesh upholstery 1 is also provided on the front side end face of the subframe 12, and the edge of the mesh upholstery 1 is folded and fitted on the front side as well. A stopper function for preventing the mesh upholstery 1 from sliding up is provided.

  According to the mesh tension structure described above, the simple work of simply rotating the fastening screw 13 and moving the sub frame 12 in the tension direction with the edge of the mesh tension fabric 1 folded back and inserted into the groove 21 of the sub frame 12. Thus, the mesh upholstery 1 can be tensioned and attached to the subframe 12. On the other hand, if the fastening screw 13 is loosened, the sub-frame 12 moves and the tension applied to the mesh tension fabric 1 is released. Therefore, the edge of the mesh tension fabric 1 can be easily detached from the groove 21 of the sub-frame 12. Thus, the mesh tension fabric 1 can be easily detached from the subframe 12. That is, without using a large-scale factory facility such as a mesh embedding facility or a heat setting facility, mesh embedding and detachment can be completed completely by hand at a site such as a hospital. Moreover, since the force for applying tension to the mesh tension fabric 1 is obtained by the rotation of the fastening screw 13, even a relatively weak person such as a woman can easily apply the tension. Accordingly, it is possible to easily replace the mesh tension fabric 1 (members constituting the body support surface of the seat portion 2 and the waist support portion 3), and even if a body fluid such as a patient's blood adheres, it is removed and washed and sterilized. Thus, it is hygienic, and the mesh tension fabric 1 can be replaced by the user's hand for each operation or as necessary. Therefore, the maintenance of the sanitary surface required as a medical chair can be easily realized.

  The mesh tension structure is not particularly limited to the above-described embodiment. For example, as shown in FIGS. 11 to 13, the subframe 12 is disposed inside the base frame 11 and the base frame 11 disposed outside. The mesh tension fabric 1 is tensioned by using the fastening screws 13 arranged in the tension direction of the mesh tension fabric 1 so that the edge of the mesh tension fabric 1 is clamped between the base frame 11 and at the same time. Anyway. In this case, when the weight is applied to the mesh stretch fabric 1, the edge of the mesh stretch fabric 1 to which a locking member (not shown) is sewn is hooked into the groove 21 and fixed at the same time. Since it is sandwiched between the frame 11 and the entire region in the direction orthogonal to the pulling direction, the support of the mesh tensioned fabric 1 becomes more rigid. Here, the subframe 12 has basically the same form as the stretched portion 14 of the subframe 12 of the embodiment shown in FIG. That is, the sub-frame 12 has a vertex 7 in the vicinity of the occupant's groin, a rear region 9 that is inclined slightly rearwardly downward from the vertex 7 toward the rear of the seat surface, and a front lowering forward of the vertex 7. A mesh tensioning surface 18 which is curved upward and has a front region 8 which is inclined or curved, and the edge of the mesh tensioning material 1 and the locking member are folded and fitted on the outer side surface. A groove 21 is provided. In addition, a mesh that is stretched between these two frames is formed by forming a corrugated uneven portion 19 on a portion of the subframe 12 that is inclined slightly rearwardly from the apex 7 of the stretched surface (upper surface) 18 of the subframe 12. A ridge 10 is formed in the rear region 9 of the upholstery 1 along the corrugated irregularities 19 of the upholstery surface 18. The base frame 11 has substantially the same outline shape as the side view of the subframe 12 (having no corrugated irregularities), and is supported and supported by a bow-shaped support arm 26 from below, and welded to the waist support frame 23 and the like. After being integrated with each other, it is connected to the gas spring of the pedestal 5. Incidentally, reference numeral 27 in the drawing denotes a receiving portion where a bush fitted to the gas spring is welded. Reference numeral 28 denotes a screw hole formed in the base frame 11, and 25 denotes a through hole of the subframe 12. The front and rear ends of the subframe 12 are provided with projecting pieces 37 for fitting and fixing the front shock absorbing member 34 and the rear shock absorbing member 35.

  On the other hand, as shown in FIG. 10 or FIG. 12, the waist support frame 23 includes left and right vertical side portions 23a that are curved in the front-rear direction along the waist shape, and horizontal side portions 23b that are arranged above and below to connect them. And is attached to a base frame 11 supported by a pedestal via a support 23c. And in the vertical side part 23a of the right and left both sides of the waist | hip | lumbar part support frame 23, the outward groove | channel open | released in parallel with the waist | hip | lumbar part support surface along the waist | hip | lumbar part support surface, ie, the edge part of the tension fabric 5, is fixed. The upholstery attaching groove 21 is provided over substantially the entire length. The edge of the tension fabric 5 in a state where a tension that can be applied manually is applied to the tension fabric mounting groove 21 by being folded back and fitted together with the locking member, so that a curve on the front side of the waist support frame 23 is obtained. A mesh stretch fabric 1 is stretched along the shape.

  Here, the members constituting each of the frames 11, 12, and 23 are not limited to specific materials, and can be made of synthetic resin or metal such as aluminum or stainless steel, but preferably polyethylene terephthalate (PET) or the like. The above-mentioned shape is assumed to have a rigidity capable of holding the tension of the mesh fabric 12 by a thermoplastic synthetic resin such as an olefin resin such as polyester or polypropylene (PP) or a thermosetting synthetic resin. Molded. For example, the rigidity necessary for glass fiber-containing resin is ensured.

  Further, as shown in FIGS. 1 and 11, the seating surface may be configured to have the same width, but may have a wider shape from the rear toward the front (front compared to the rear). . For example, as shown in FIG. 14, the front region 8 mainly in the vicinity of the pelvis that is curved forward and downward from the top of the seating surface is formed wider toward the front. In this case, since the thigh near the pelvis is lightly supported without being pressed, it is easy to move the leg when performing pedal operation or the like under the foot, and it is difficult to get tired. For example, in the seat portion 2 of the embodiment shown in FIG. 14, the front end width is set to 450 mm with respect to the rear end width 430 mm. In this case, the support area of the thigh in the vicinity of the pelvis is widened, so that it is easy to perform an operation under the foot, for example, a pedal operation.

  In the case of this embodiment, the waist support part 3 and the seat part 2 are formed of a single mesh upholstery 1 and the body support surface is continuously formed. For this reason, since the force (weight) applied to the seating surface also acts as a force for the lumbar support surface to support the lumbar portion of the seated person, a good holding feeling that holds the standing pelvis three-dimensionally can be obtained. Of course, the seat portion 2 and the waist support portion 3 may be discontinuously formed by the divided mesh stretch 1, but in this case, the upper end of the mesh stretch 1 constituting the seat surface is formed by some means. If it is fixed with a frame (not shown) so as not to move in the front-rear direction, the same hold feeling as in the case where the waist support part 3 and the seat part 2 are integrally formed can be obtained. Here, the seat portion 2 and the waist support portion 3 form one continuous body support surface with a single mesh tension fabric 1, but in some cases, a plurality of mesh tension fabrics 1 or resin shells are sewn together. Or integrated by joining.

  In addition, in this specification, what is called the mesh tension fabric 1 has the flexibility required to produce the strength and elasticity necessary for a body support structure such as the chair seat 2 or the waist support 3. Including all mesh-like upholstery fabrics composed of elastomer materials or structurally exhibiting elasticity etc., for example, any form such as woven fabric, knitted fabric, mesh made of woven fabric or knitted fabric, non-woven fabric, etc. However, it is preferable to use a woven fabric or knitted fabric made of thermoplastic resin fibers such as polyester yarn or nylon yarn, or a mesh made of woven fabric or knitted fabric (in the present specification, these are simply referred to as a mesh). Is called). According to the body support surface, particularly the seating surface, constituted by the mesh upholstery 1, the weight of the seating surface is not felt because the body weight is dispersed and supported by the entire surface contacting the seating surface of the surgeon who is the seated person, Since a high breathability can be obtained, a chair that reduces fatigue of a seated person in a long-time sitting operation such as an operation can be provided.

  In the case of the above-described embodiment, by providing the shape of a part of the frame that stretches the mesh upholstery 1, that is, the wrinkle 10 having corrugated irregularities on the mesh upholstery 1 in the rear region 9, the body support surface of the rear region 9 is provided. Although the amount of elongation in the front-rear direction of the mesh stretch fabric 1 is increased to create a situation where it is easy to sink, it is not particularly limited to this. For example, by changing the knitting method between the front region 8 in front of the seating surface and the rear rear region 9, the elongation of the rear region 9 is made larger than the elongation of the front region 8, the arrangement of the elastomer yarn, the number of insertions, etc. The tension of the mesh can be changed partially by changing the tension, combining the stretched mesh stretch fabric and the non-stretched mesh stretch fabric, or deliberately making the mesh weave density or weave density of the mesh stretch fabric 1 By using a low-density part with a coarse mesh and a high-density part with a fine mesh, the rear region 9 may be configured to have a larger amount of elongation than the front region 8. .

  For example, the mesh fabric 1 shown in FIG. 16 has a mesh knitted structure or a woven structure partially or a constant section by changing the weaving method or the knitting method in a portion corresponding to an arbitrary position and region in the middle of knitting. To form at least two regions, a front region (low stretch region) 8 that is difficult to expand and contract and a rear region (high stretch region) 9 that is easier to expand and contract, 8 boundary 33 is formed non-linearly. For example, in the case of manufacturing as a knitted fabric, a knitted weft yarn 29 that forms a knit loop and an insertion yarn that is knitted without forming a knit loop and locked to the knit loop of the knitted weft yarn (knitted to increase tension) Reinforcement yarn) 30 and at least two types of yarn are knitted by circular knitting. Specifically, for example, in the mesh tension fabric 1 according to the present embodiment, an elastomeric polyester yarn (hereinafter also simply referred to as an elastomer yarn) 28 made of a monofilament forms a knit loop in the lateral direction (X-axis direction). Knitted by weaving a knitting weft yarn 29 composed of a plurality of strands (hereinafter also simply referred to as polyester yarns) that are arranged in the transverse direction as insertion yarns that are knitted and twisted together so as to be entangled with the insertion yarns 28 A loop is formed, and an elastic weft knitted fabric is knitted. This elastic weft knitted fabric is provided so as to apply a stronger tension in the lateral direction, that is, in the direction of the insertion yarn, by heat treatment. The use of the insertion yarn (elastomer yarn) 30 is preferable in order to increase the tension of the entire mesh stretch 1, but it does not necessarily need to be knitted, and the strength and elasticity required for the body support structure only with the knitting weft yarn 29. In some cases, the elastic weft knitted fabric may be used in the case where the flexibility to generate the tension is exhibited. Incidentally, in the case of a knitted fabric, the insertion yarn / elastomer yarn 30 can be put only in either the horizontal or vertical direction, but any number of types can be put in if necessary.

  Here, as a technique for increasing the density of the front region 8 compared to the rear region 9 by changing the knitting structure (knitting method) in the middle, for example, the mesh fabric 1 is circular knitting (weft knitting). The rear region 9 is knitted with a tentacle knitting, the front region 8 is knitted by switching to a tuck knitting, and the boundary 33 between the two regions is partially in the middle of the loop of one course (direction in which the knitted fabric is formed) Alternatively, it is possible to form a non-linear shape by switching the knitting method in the entire region and shifting the portion to be switched in the wale direction (direction in which the loops are continuously bound: the vertical direction) stepwise. In other words, a non-linear boundary is formed by changing the knitting structure (knitting method) by switching the knitting method while knitting one step (one course) in the horizontal direction and shifting the switching position step by step for each course. ing. As is apparent from the enlarged view of FIG. 17, the knitting weft yarn 29 runs simply so as to be entangled with the elastomer yarn insertion yarn 30 in the rear region 9, but more yarns run diagonally in the front region 8. As a result, the amount of the knitting weft yarn 29 has also increased. Therefore, it becomes difficult to see through in the front region 8 and looks relatively darker than the rear region 9. The rear region 9 has a structure in which the knitting weft yarn 29 is easy to move and expands and contracts, whereas the front region 8 has a structure in which the yarn running in an oblique direction disturbs and does not easily expand and contract. In addition, the boundary 33 that divides the front region 8 and the rear region 9 is also formed in a non-linear manner by shifting the knitting structure (knitting method) in stages. The mesh fabric 1 may be composed of a woven fabric (hereinafter referred to as an elastic woven fabric) woven with heat-shrinkable warps and wefts.

  Here, regarding the boundary 33 between a plurality of regions having different easiness of extension, that is, the strength of the tension, in this specification, the non-linear shape is linearly formed in the left-right width direction and the vertical direction or the front-rear direction. It is used as a term meaning that it is not done, and mainly refers to a curve, but it includes a closed region such as a line consisting of a set of straight lines whose direction changes finely or a polygonal shape. Further, the ease or difficulty of expansion and contraction of the mesh fabric 1 is not proportional to the knitting density of the mesh fabric 1 or the number of elastomer yarns. “High density / low density”, “hardness / softness of mesh tension fabric itself”, and “large / small amount of insertion thread” do not necessarily match the stretchability of mesh tension fabric. In other words, even in the low stretch region, the low density and the tension fabric itself may be soft.

  Also in the case of the mesh stretch 1, the rear region 9 is more easily expanded and contracted than the front region 8 and sinks. For this reason, a sciatic nodule can be held and a forward shift can be prevented. In addition, since the boundary 33 between the front region 8 that is difficult to expand and contract and the rear region 9 that easily expands and contracts is formed in a non-linear manner, the change in the support force received by the seated person can be made stepwise. A feeling can be eased. Therefore, the step at the boundary (difference in elastic support force) is localized and strong and can be reduced from acting on the occupant's body. The rear region 9 that supports the buttocks of the ground 1 can be easily submerged. That is, while maintaining the strength of the support between the area that wants to support the seated person firmly and the area that wants to support it softly, it makes it difficult to feel the step at the boundary between both areas, reducing the sense of incongruity when sitting, Can be a good chair. In addition, the mesh stretch fabric 1 is formed by partially changing the knitting method or weaving method in the middle to change the knitting structure or the woven structure itself, so that at least a region that is difficult to stretch and a region that is more easily stretched than this are at least Since the two regions are formed, the anti-slip effect is exhibited. That is, since the feel is changed by partially changing the knitted or woven structure, an anti-slip effect can be obtained. Also by this, it is possible to prevent the sacrum and / or the thigh near the buttocks from sliding forward, prevent sacral sitting in advance, and maintain a stable sitting posture.

  In addition, it is possible to form a portion that is difficult to stretch and a portion that is easily stretchable in one mesh tensioned fabric 1 by changing the arrangement density of the elastomer yarn and the insertion yarn according to the part of the body support structure. it can. That is, it is possible to increase the repulsive force of the portion where the arrangement density of the elastomer yarn inserted into the mesh fabric rich in elasticity is increased, and conversely, it is possible to reduce the repulsive force of the portion where the arrangement density is reduced to facilitate bending. As a result, the rear region 9 can be more easily expanded and contracted than the region mainly supporting the thigh. Thereby, a sciatic nodule can be held and a forward shift can be prevented.

  In the present embodiment, the mesh tension fabric is knitted or woven using heat-shrinkable elastic yarns, but the present invention is not limited to this, and the mesh tension fabric is knitted or woven with non-elastic yarns. You may do it. Even in this case, if the elastomer yarn is used as the insertion yarn, the elasticity of the entire mesh fabric can be exhibited.

  Here, it is preferable that the seat portion 2 and the lumbar support portion 3 form one continuous body support surface by one mesh upholstery 1 (or a synthetic resin shell) or by stitching or joining. . In this case, since the mesh stretch 1 of the lumbar support portion 3 also bears the tension applied to the seating surface of the rear region 9, the heel support surface and the lumbar support surface are linked to hold the entire pelvis. A good hold feeling is given and a stable posture is maintained.

  Moreover, the member which comprises a body support surface is not necessarily restricted to the mesh tension fabric 1. FIG. As long as it has air permeability, for example, it may be configured by a resin shell 31 which is a plastic molded product as shown in FIG. Even in this case, the seat 2 and the waist support 3 may be configured as separate members independent of each other, but it is preferable to form them integrally and continuously. In this case, since the force (weight) applied to the seat surface also affects the waist support surface and acts as a force to support the seated person's waist, there is a good hold feeling to hold the standing pelvis in three dimensions. can get. Moreover, the seat part 2 and the waist | hip | lumbar part support part 3 which are comprised with the resin-made shells 31 straddle the left-right flame | frame (illustration omitted) by the side of a chair main body in the vicinity of the front-end edge and back-end edge of the back surface, for example. It is easily detachably assembled by being provided with mounting plates (not shown) before and after being arranged and being fastened with screws or the like.

  The seat portion 2 constituted by the resin shell 31 has a hole 32 dispersedly disposed at least in a portion that is touched by the body of the seated person, thereby providing breathability, elasticity and structural strength required as a seat as a whole. Combined structure and partial sinking of the seating surface are secured. Here, the holes 32 are larger than the front region 8 by increasing the amount of expansion of the rear region 9 by making the number of arrangement, the hole diameter or the pitch (density) different between the front region 8 and the rear region 9. Also, the rear region 9 can be more easily depressed. At the same time, since the front region 8 is tensioned, it becomes a pawl and can prevent the seated person from slipping forward. In other words, it is possible to hold the sciatic nodule of the seated person to prevent the forward displacement, so that it is prevented from becoming a so-called sacral seat, less fatigue and easy to lead to a proper posture even if sitting for a long time. It will be a thing. Specifically, the number of holes in the rear region 9 is made larger than the number of holes in the front region 8 to increase the amount of expansion and contraction (make it easier to bend), and the front region near the sitting reference point is ahead of the apex 7 It is preferable to make it sink more than 8. The holes may be evenly distributed or may be concentrated locally. Further, by changing not only the number of holes but also the arrangement density, the hole diameter, and the like, it is possible to make the vicinity of the sitting reference point sink more easily than the front region 8 ahead of the apex 7. Of course, as in the case of the body support surface by the mesh tension fabric 1, the shell material itself is made of a non-slip material having a high friction coefficient, or a material having a high friction coefficient, such as rubber, is rubbed on the shell of a normally used material. It is preferable in order to prevent a pre-slip by covering a part having a high coefficient partly or entirely, or forming a non-slip structure by a protrusion so as to prevent a pre-slip. The non-slip structure may be the entire seat surface or a part of the seat surface. A part of the above-described seating surface may be around the seated buttock (back of the seating surface) or around the occupant's thigh (front of the seating surface). Furthermore, a non-slip structure only at the waist may be used. That is, even if the seat is a chair with a short depth, if the seated person has a structure that is difficult to slip, the so-called sacral sitting can be prevented by preventing the forward displacement, and the correct posture with the pelvis can be maintained. In addition, as described above, even when the members (seat portion 2 and main portion support portion 3) constituting the body support surface are constituted by the synthetic resin shell, the breathability is ensured, so that the stuffiness is reduced. However, even if a body fluid such as a patient's blood adheres, it is hygienic because it is a plastic molded product and can be easily wiped off and subjected to alcohol disinfection.

  According to the surgical chair configured as described above, the correct posture can be maintained or guided to the correct posture, so that the fatigue of the seated person in a long-time sitting operation such as surgery can be reduced. That is, since the depth of the seating surface is short, it is not possible to sit in a posture in which the seat is turned back and forth. As a result, the pelvis stands, the spine is kept upright without bending, and the head is straight on the spine without tilting forward, so you can sit well and sit for a long time Even if it is, it is hard to get tired. In other words, when sitting down, the patient must be seated in a good posture so that the pelvis is raised, and the head weight can easily be led to an appropriate posture on the spine, so that fatigue is reduced. Moreover, since the seating surface has elasticity and breathability, the hips hardly hurt even when sitting for a long time, and it is difficult to get stuffy. Therefore, it is suitable for use in microscopic surgery and the like that last for several hours to 20 hours.

  Also, because the seat surface is short and supports a part of the thigh near the groin, the thigh near the knee cannot be supported. Since the foot is free, the pedal operation is easy. Since operations such as microscope focusing, switch operation, and raising / lowering operation of the microscope during the operation are all performed with the foot by the pedal operation, these operations can be performed accurately and easily.

  Further, the shock absorbing member 34 protruding forward from the front ends of the left and right frames 12 constituting one corner of the seat end is the portion having the largest turning radius when the seat surface rotates, so that it is most likely to collide when the seat rotates. It becomes a place. That is, since the front shock absorbing member 34 collides with surrounding equipment, devices, people, etc. prior to the structural frame having high rigidity, the shock can be reduced. This is the same when the chair is moved horizontally (moving forward). First, the front shock absorbing member 34 collides with surrounding equipment, devices, people, etc., so that the shock can be reduced. it can. Therefore, even if it collides with facilities, equipment, walls, people, etc. around the chair, the influence on both can be reduced. Of course, this impact mitigating function is not limited to the front impact cushioning member 34 disposed in front of the seat, but is also exhibited in the rear impact cushioning member 35 or the side impact cushioning member (not shown).

  In addition, since the surgical chair according to the present embodiment has a structure in which the mesh stretch fabric 1 is stretched by the left and right subframes 12, the front end edge of the mesh stretch fabric 1 does not have a supporting frame. For this reason, if it tries to lift the front edge part of the mesh tension fabric 1 when lifting a chair, the mesh tension fabric 1 will be extended and support will become unstable. However, if the front shock absorbing member 34 is lifted as a handle, the support of the chair is stabilized. In addition, it is also effective in carrying when the chair is in the sitting state or only the chair is moved left and right or carried. Further, when the rear shock absorbing member 35 is provided, the chair can be easily carried by lifting both the front shock absorbing member 34 and the rear shock absorbing member 35 with both hands. Of course, even when the front shock absorbing member 34 and the expansion frame portion 36 are provided, the chair can be easily carried by lifting them with both hands.

  Further, when the space 42 is formed between the seat portion 2 and the shock absorbing members 34 and 35, the shock absorbing from the front / rear / left / right direction, or the equipment / devices or people around the chair in the front / rear / left / right direction, etc. It is effective in mitigating the impact at the time of collision.

  Further, the impact buffering member 35 protruding rearward of the seat can be used not only for the impact mitigation function and handle function against the impact applied rearward or from the rear, but also for holding and holding a sterilized cloth. For example, by bundling the terminal of the sterilized cloth hung so as to cover the waist support part 3 and then pushing it into the cavity 42 of the rear shock absorbing member 35, it can be easily fixed to the chair. For this reason, it becomes possible to cover the waist | hip | lumbar part support part 3 easily using a general rectangular sterilization cloth.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the description has mainly been given with an example applied to a surgical chair on which a surgeon sits during an operation. However, the present invention is not particularly limited thereto, and the equipment, equipment, walls, and people around the chair are not limited thereto. The problem such as collision with other work space is a problem that can occur in other work space, especially in a narrow work space, so of course as a chair where a doctor or medical worker other than the surgeon sits in the operation room, or in other narrow spaces Work as a chair where a worker sits as a chair, a work chair or a nursing chair where a worker sits in a workplace, laboratory, factory, etc. where there are many moving people and equipment around the chair. It is suitable for use in general chairs.

  Further, in the above-described embodiment, the shock absorbing members 34 and 35 are formed so as to function as a handle by forming a space 42 into which the hand can be inserted between the seat portion 2, but are particularly limited to this. Although not shown, although not shown, for example, by providing a recess (non-through hole), a step, or a slit that can not be inserted into the hand, the fingertip or the like may be hooked to satisfy the function as a handle. .

  Further, in the present invention, the seat surface shape, the depth dimension, the height of the back, etc. in the surgical chair mainly described in the above embodiment are not necessarily limited. The shape and depth of the seat as the work chair, the width and height of the main support are determined as necessary in various work modes, and even in this case, at least the front shock absorbing member 34 or The advantage of providing the rear shock absorbing member 35 and the like is not impaired. Furthermore, it is not limited to the seat structure as described above, and even when the seat is constituted by urethane foam, a wooden seat plate or the like, or even in the case of an arc-shaped seat surface, an impact buffering member is provided to project forward. That is preferred.

  Further, although not shown in the drawings, the impact buffering member disposed around the seat part 2 may be provided with a side impact buffering member that protrudes to the side of the seat part 2 so that the impact buffering function is fully achieved. You may make it expand in a direction. In this case as well, it is effective for cushioning against impacts from the left and right sides, or for mitigating impacts in the case of collisions with equipment, devices, and people around the chair in the left and right directions. It is effective to use the shock absorbing member as a handle to move left and right while sitting, or to move left and right with the shock absorbing member arranged on the side, and lift it for transportation. Of course, the impact buffering member disposed on the side is not only fixed to the left and right frames, but may also be fixed directly to a frame or a leg column that is fixed to the leg column. Moreover, it is preferable to provide the shock absorbing member arranged on the side so as to be always at the same height with respect to the seating surface.

  Further, the shock absorbing members disposed around the seat portion 2 are not only provided independently as the front shock absorbing member 34, the rear shock absorbing member 35, or the side shock absorbing members, but also as one member. What was mutually connected, for example, may be comprised over the perimeter around a seat as an annular shock-absorbing member. Also in the case of this annular shock absorbing member, it may be arranged and attached so as to open a space with respect to a seat frame such as a side frame or a base frame or a pedestal. In addition, for example, by extending the end portion of the side impact buffer member so as to wrap around the front side of the seat portion, or by extending the end portion so as to wrap around the rear side of the seat portion, a part of the side impact buffer member May function as a front shock absorbing member or a rear shock absorbing member, and conversely, by extending both ends of the front shock absorbing member or the rear shock absorbing member to the side, A part of the member or the rear impact buffer member may function as a side impact buffer member. That is, in the present specification, having an impact cushioning member that protrudes forward from at least the front end edge of the seat and functions as a handle means that there is an impact cushioning member that projects forward of the seat, It does not mean that the seat frame is limited to an impact cushioning member that is attached to both front ends of the seat frame, particularly the left and right subframes, and projects forward therefrom.

  Further, in the above-described embodiment, the front and rear impact buffer members 34 and 35 are detachably attached by being fixed to the left and right frames with bolts. Therefore, after removing the shock absorbing members 34 and 35, a member having another function other than the impact mitigation can be attached using the attachment site / structure, and another function can be added. For example, you may make it attach.

Further, in the above-described embodiment, the mesh tension fabric 1 is structured to be attached to the main frame at the same time as tension is applied by expansion of the frame structure in the width direction, but is not particularly limited thereto, and is configured by an elastomer material. Seat body made of a body support structure (see Japanese Patent Application Laid-Open Nos. 11-290153 and 2001-78852) in which a mesh tensioned fabric 1 is fixed and integrated with a frame in a state where a certain tension is applied in advance. 2 and the waist support part 3 or a seat part 2 and a waist support part 3 independent from each other may be detachably mounted on the base frame 11. That is, in the present specification, the fact that at least the member 1 constituting the body support surface constituting the seating part is detachable means that the mesh stretched structure 1 is not limited to the tension structure of the frame interval extending mechanism shown in the drawing. It is. Also in this case, since the mesh stretch fabric 1 is integrated with the frame at the manufacturing stage, the attachment structure for connecting the frame surrounding the mesh stretch fabric 1 so as to be detachable from the chair body frame is provided on the chair body side. By adopting the above, it is possible to replace the member constituting the body support surface, that is, the mesh tensioned fabric 1 for each frame. Thus, the cleanliness required as a medical chair can be realized.

  Moreover, in the above-mentioned embodiment, although the example which made both the seat part which comprises a body support surface, and the waist | hip | lumbar part support part 3 had air permeability structure was demonstrated, it is not restricted to this in particular, At least in a seat If the structure has air permeability, a sufficient effect can be obtained against stuffiness in the buttocks and thighs of the seated person.

1 Members that make up the body support surface (mesh stretch)
2 Seat part 3 Lumbar support part 11 Base frame 12 Sub frame 34 Front impact buffer member 35 Rear impact buffer member 36 Expansion frame part 42 Space (opening part) between impact buffer member and frame

Claims (9)

In a work chair with casters for supporting a body support structure such as a seat part or a waist support part between a pair of left and right frames extending in the front-rear direction,
A work chair comprising an impact cushioning member that protrudes forward from at least the front end edge of the seat and functions as a handle. The work chair according to claim 1, wherein the shock absorbing member has an arcuate shape that hangs down in front of the seat portion. The work chair according to claim 1 or 2, wherein the shock absorbing member projects forward from the tip of the pair of left and right frames. The work chair according to any one of claims 1 to 3, wherein the shock absorbing member is detachable from the frame. The chair according to any one of claims 1 to 4, wherein the shock absorbing member has a core material integrally formed with the frame, and the core material is covered with a shock absorbing material. The chair according to any one of claims 1 to 5, wherein the impact buffering member is further provided at one or both of the rear and side of the seat portion. The work chair according to any one of claims 1 to 6, wherein a space in which a hand enters is formed between the impact buffering member and the seat portion. 8. The expansion frame portion that functions as a handle by forming a space in which a hand can be inserted between the waist support portion and the waist support portion. Work chair as described in. The body support structure has a seat part for supporting a seated person and a waist support part, and the seat part is one of the thighs near the groin and the groin when seated deep in the seat with the pelvis upright. Depth length L that is the length that supports the part and the length of the thigh that is insufficiently supported when sitting on the sacrum, and the area that mainly supports the buttocks is limited to the area just before the waist support part, The work chair according to any one of claims 1 to 8, which three-dimensionally supports a seated person's sciatic tubercle.