JP5987332B2 - Chair - Google Patents

Description

  The present invention relates to a chair used in a school or the like and provided with casters.

  2. Description of the Related Art Conventionally, various chairs used in schools and the like are provided with casters in order to facilitate the movement. Many conventional chairs of this type employ a configuration in which a caster is provided at the front end of a leg structure that supports a seat, and the caster is always grounded. When moving, only the casters are grounded by an operation such as lifting one end of the chair (see, for example, Patent Document 1).

  Thus, in the chair of such a mode, conventionally, a bracket is provided between the shaft member serving as the pivot center of the caster and the leg structure in order to provide the caster at the front end of the leg structure. Therefore, the structure of the front-end part of a leg structure becomes complicated, and the malfunction that the said bracket feels disturbed at the time of sitting exists. Further, if the joint portion between the leg structure and the bracket is made thin in order to solve this problem, another problem such as the joint portion being easily broken when the caster is used is generated.

Japanese Patent No. 2840703

  The present invention focuses on the above points and aims to simplify the structure of a chair having casters while ensuring the strength when the casters are used.

That is, the chair according to the present invention can roll around a seat, a leg structure that supports the seat, and a caster mounting shaft that is fixed to the leg structure, and is separated from the floor surface when seated. A caster, and a front base of the leg structure and a leg base connected to the lower end of the front leg, the front end being curved in a side view and extending upward toward the front leg, are integrally formed; The caster mounting shaft is fixedly provided at the front end portion of the leg base, and the lower surface of the portion corresponding to the position in the front-rear direction from the front end of the leg structure to the caster mounting shaft when seated is from the installation floor surface. It is characterized by being spaced upward.

  In such a case, the caster mounting shaft is fixed and mounted directly to the leg structure, so that the structure is extremely simple. Further, only the caster mounting shaft is provided between the leg structure and the caster. Since it is interposed, it is possible to suppress the occurrence of troubles that are disturbed when seated. In addition, since the caster mounting shaft is fixed directly to the leg structure, the number of joints is small, and the caster and the caster mounting shaft are not subjected to load when seated because the caster is separated from the floor surface when seated. Therefore, the strength at the time of use can be secured.

  As a configuration for reducing the space required for storing such a chair, when stacking on another chair having the same structure or another chair having a structure excluding casters from the other chair The other chair may be one in which the caster does not interfere.

  As a configuration for easily realizing a configuration in which the chair can be moved using the casters by tilting the chair forward while separating the casters from the floor surface when seated, the rear of the casters of the leg structure. In this part, a grounding body that is preferentially grounded when seated is provided separately from the caster.

  As one of the structures for the purpose of facilitating the movement of the chair using a caster, there is one provided with a backrest provided above the seat and a handle provided behind the backrest. Can be mentioned.

  In particular, if the handle is provided at the upper end of the back support frame that supports the backrest, there is no structure that obstructs the grip when gripping the handle from above. Can be gripped more naturally.

  In addition, if the handle has a gripping hole penetrating in the vertical direction, both the mode of gripping through the hand from above the gripping hole and the mode of gripping through the hand from below the gripping hole are taken. Therefore, such a chair can be easily moved using a caster regardless of the height of the user.

  Then, as a mode for arranging the appearance of the mounting portion of the caster to the leg structure, a stepped portion capable of accommodating the caster mounting shaft is provided in a portion where the caster mounting shaft of the leg structure is to be mounted. What is provided.

  ADVANTAGE OF THE INVENTION According to this invention, in the chair which has a caster, simplification of a structure can be achieved, ensuring the intensity | strength at the time of use of a caster.

The front view which shows the chair which concerns on one Embodiment of this invention. The side view which shows the chair which concerns on the same embodiment. The top view which shows the chair which concerns on the same embodiment. The perspective view which shows the stacking aspect of the chair which concerns on the same embodiment. The perspective view which shows the stacking aspect of the chair which concerns on the same embodiment. The figure which shows the attachment aspect of the caster support shaft of the chair which concerns on the same embodiment. The disassembled perspective view which shows the attachment aspect of the caster of the chair which concerns on the same embodiment.

  An embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIGS. 1 to 5, the chair 1 according to this embodiment includes a seat 2, a leg structure 3 that supports the seat 2, a backrest 4 provided on the rear upper side of the seat 2, and the backrest. Rolling around a caster mounting shaft 7 fixedly provided at a position behind the front end of the leg structure 3, a back support frame 5 that supports the back 4, a handle 6 provided behind the backrest 4 The caster 8 is located at a position separated from the installation floor surface. 1 to 3, the seat 2 and the backrest 4 are indicated by imaginary lines.

  More specifically, as shown in FIGS. 1 to 5, the seat 2 has a plate shape, and the seating surface has an inclination toward the lower side toward the front. The seat 2 is supported by the leg structure 3 from below.

  As shown in FIGS. 1 to 5, the leg structure 3 is attached to the lower surface of the seat 2 and supports the lower surface of the seat 2, and the leg structure 3 is suspended from the seat support portion 31. The left and right front legs 32 and rear legs 33, the leg base 34 connecting the lower end of the front leg 32 and the lower end of the rear leg 33, the grounding body 35 attached to the lower surface of the leg base 34, and the seat support A cover plate 36 that covers the lower surface of the portion 31 and a seat receiving plate 37 that is disposed above the seat support portion 31 and on which the seat 2 is disposed are provided. The seat support portions 31 are provided in a pair of left and right. The left seat support part 31 extends from the lower center of the seat 2 to the left front and left rear. Similarly, the right seat support 31 extends from the lower center of the seat 2 in the plan view to the right front and right rear. Here, the covering plate 36 is disposed below the center portion in the depth direction of the seat support portion 31. The covering plate 36 has a circular shape in this embodiment. On the other hand, as described above, the seat receiving plate 37 is disposed at a position directly above the covering plate 36. The cover plate 36 is also circular in this embodiment. Although not shown, the cover plate 36 and the seat receiving plate 37 are connected using a male screw member and a female screw, and the seat support portion 31 is sandwiched between the cover plate 36 and the seat receiving plate 37. The front legs 32 are provided in a pair of left and right sides and hang down from the front end of the seat support portion 31 as described above. The rear legs 33 are also provided in a pair on the left and right sides and hang down from the rear end of the seat support portion 31 as described above. The leg base 34 is provided in a pair of left and right, and smoothly connects the lower end of the front leg 32 and the lower end of the rear leg 33 as described above. Further, the front end portion and the rear end portion of the leg base 34 both have an arc shape in a side view, and extend upward toward the front end or the rear end, that is, the front leg 32 or the rear leg 33. Further, the other portion, that is, the intermediate portion of the leg base 34 extends horizontally, that is, parallel to the floor surface. Here, the left seat support portion 31, the left front leg 32, the left leg base 34, and the left rear leg 33 are integrally formed of a metal pipe. Further, the right seat support portion 31, the right front leg 32, the right leg base 34, and the right rear leg 33 are also integrally formed of a metal pipe. In addition, the center portions in the depth direction of the left and right seat support portions 31 are welded together to integrally form the whole except for the leg base 34, the covering plate 36, and the seat receiving plate 37. Further, a stepped portion 34a is provided at the front end portion of the leg base 34, and the caster mounting shaft 7 is mounted in a state where the caster mounting shaft 7 is housed therein. The grounding body 35 is attached to the lower surfaces of the front half and the rear half of the leg base 34.

  As shown in FIGS. 1 to 5, the backrest 4 is located in the vicinity of the upper end of the rear end of the seat 2 and has a plate shape in the present embodiment. The backrest 4 is supported on the back support frame 5 from behind.

  As shown in FIGS. 1 to 5, in the present embodiment, the back support frame 5 has a base end portion fixed to the seat support portion 31 of the leg structure 3 by a method such as welding and extends backward. A connecting portion 51 that is paired to the left and right, and a back support portion 52 that is erected upward from the rear end of the connecting portion 51 and that is paired to the left and right and the backrest 4 is attached to the front of the upper end portion. ing. In the present embodiment, the left connecting portion 51 and the left back support portion 52 are integrally formed by bending one metal pipe. Similarly, the right connecting portion 51 and the right back support portion 52 are integrally formed by bending one metal pipe. The handle 6 is attached between the upper ends of the left and right back support frames 5.

  As shown in FIGS. 1 to 5, the handle 6 is attached between the upper ends of the left and right back support frames 5 as described above. In addition, the handle 6 has a front element 61 that linearly connects the upper ends of the left and right back support frames 5, and is positioned behind the front element 61 and bulges rearward in a substantially arc shape in plan view. And a rear element 62. Further, the handle 6 has a gripping hole 6a penetrating in the vertical direction inside thereof, in other words, between the front element 61 and the rear element 62.

  As shown in FIG. 6, the caster mounting shaft 7 is located behind the front end of the leg structure 3 and in front of the front grounding body 35, more specifically, behind the rear end of the front leg 32. It is fixedly provided by a method such as welding while protruding outward from a portion in front of the grounding body 35 on the front side. More specifically, the caster mounting shaft 7 includes an insertion portion 71 inserted into the leg structure 3 and a fixing portion 72 provided outside the insertion portion 71 and having a larger diameter than the insertion portion 71. A shaft main body 73 provided outside the fixing portion 72 and pivotally supporting the caster 8 is provided, and the fixing portion 72 is welded or the like in a state where the fixing portion 72 is housed in the stepped portion 34a of the leg base 34. It is fixed by the method. The caster 8 is cantilevered on the shaft body 73 of the caster 8 support shaft.

  As shown in FIGS. 1, 3 to 5, and 7, and as described above, the caster 8 is cantilevered on the caster mounting shaft 7, and the caster mounting shaft 7 is centered on the pivot. Can be rotated around it. More specifically, the caster 8 includes a wheel 81 that is pivotally supported by the shaft main body 73 of the caster mounting shaft 7 and can roll on the installation floor surface, and the caster mounting shaft 7 to prevent the wheel 81 from coming off. An E-ring 82 as a retaining member attached in a state of being engaged with a constriction 73 a provided at the tip of the shaft body 73, and the center of the outer surface of the wheel 81 attached to the center of the outer surface of the wheel 81. And a cap 83 which is a covering for covering the portion. The caster 8 is separated from the installation floor when seated. That is, when seated, the grounding body 35 attached to the leg base 34 of the leg structure 3 is grounded in preference to the caster 8. Here, as a manner of mounting the caster 8 to the caster mounting shaft 7, a screw insertion hole through which a male screw member can be inserted is provided in the caster 8, and a female screw is provided on the caster mounting shaft 7 side. It is also conceivable that the male screw member is screwed to the female screw on the caster mounting shaft 7 side with the male screw member inserted therethrough.

  The chair 1 grips the handle 6 through a gripping hole 6a of the handle 6, and then tilts the backrest 4 of the chair 1 forward as shown by the imaginary line in FIG. The caster 8 can be landed on the installation floor surface while the rear end portion is separated from the floor surface. That is, by applying such an operation, the chair 1 can be easily moved using the casters 8.

  Further, as shown in FIG. 4, when the chair 1 is stacked on another chair 1B having the same structure as that obtained by removing the caster 8 from the chair 1, the caster 8 interferes with the other chair 1B. It is configured not to. In addition, in the following description, the same name and the code | symbol which added B to the tail are attached | subjected to each part of the other chair 1B. More specifically, when the chair 1 is stacked on the other chair 1B, the entire caster 8 is positioned outside the leg base 34B of the other chair 1B in a plan view.

  Further, as shown in FIG. 5, the chair 1 is configured so that the caster 8 does not interfere with the other chair 1C even when the chair 1 is stacked on the other chair 1C having the same structure as the chair 1. . In addition, in the following description, the same name and the code | symbol which added C to the tail are attached | subjected to each part of other chair 1C. More specifically, when the chair 1 is stacked on the other chair 1C, the entire caster 8 is located outside the leg base 34C of the other chair 1C in plan view. The lower end of the caster 8 of the chair 1 is located at the upper end of the caster 8C of the other chair 1C.

  As described above, according to the configuration of the chair 1 of the present embodiment, the caster attachment shaft 7 is directly fixed and attached to the leg structure 3, so that the structure becomes extremely simple, and the leg structure Since only the caster mounting shaft 7 is interposed between the body 3 and the caster 8, it is possible to suppress the occurrence of troubles that are disturbed when seated. In addition, since the caster mounting shaft 7 is fixed and mounted directly to the leg structure 3, the number of joints is small, and the caster 8 is separated from the floor surface when seated, so the caster 8 and the caster mounting shaft 7 are seated when seated. Can receive the strength without using the load.

  Further, since the caster 8 is prevented from interfering with the other chair 1C having the same structure or the other chair 1B having the structure in which the caster 8 is removed from the other chair 1 is stacked, The space required for storing a large number of chairs 1 can be reduced.

  Further, since the grounding body 35 that is grounded preferentially at the time of sitting is provided separately from the caster 8 at a position behind the caster 8 of the leg structure 3, as described above, the grounding body 35 is arranged at the time of sitting. The chair 1 can be made available by using the caster 8 by tilting the chair 1 forward while separating the caster 8 from the floor surface.

  In addition, since the handle 6 is provided behind the backrest 4, the caster 8 can be landed by a simple operation of grasping the handle 6 and tilting the backrest 4 forward, and the chair 1 is moved. You can make a convenient flight.

  In addition, since the handle 6 is provided at the upper end of the back support frame 5 that supports the backrest 4, there is no structure that obstructs the handle 6 when gripped from above. The grip 6 can be gripped more naturally.

  Further, since the grip 6 has a gripping hole 6a penetrating in the vertical direction, the grip 6 takes both a mode of gripping through the hand from above the gripping hole 6a and a mode of gripping through the hand from below the gripping hole 6a. Therefore, the chair 1 can be easily moved using the casters 8 regardless of the height of the user.

  And since the step push part which can accommodate the said caster attachment shaft 7 is provided in the site | part which should attach the said caster attachment shaft 7 of the said leg structure 3, the attachment to the leg structure 3 of the caster 8 is provided. The appearance of the part can be adjusted and the mounting strength of the caster mounting shaft 7 can be secured.

  The present invention is not limited to the embodiment described above.

  For example, even if the chair is configured to interfere with other chairs having the same structure, or other chairs having a structure in which the casters are removed from the other chairs, the caster mounting shaft may be attached to the leg structure. It has a configuration in which the lower surface of the portion corresponding to the position in the front-rear direction from the front end of the leg structure to the caster mounting shaft is spaced upward from the installation floor surface while being fixedly provided at a portion behind the front end. If it is, the most important effect of the present invention, that is, the effect that the structure can be simplified while securing the strength when the caster is used can be obtained.

  In the above-described embodiment, the grounding body that is preferentially grounded when seated is provided separately from the casters. However, an embodiment in which these grounding bodies and casters are provided integrally may be employed.

  Furthermore, in the above-described embodiment, the handle is provided at the upper end of the back support frame that supports the backrest behind the backrest, but the chair provided without the backrest and the handle provided behind the backrest is omitted. The configuration of the present invention may be applied to a chair, a chair provided with a handle as a hole penetrating the backrest in the front-rear direction, or a chair provided with a handle at another location such as above the backrest.

  In addition, in the embodiment described above, the handle employs a configuration having a gripping hole penetrating in the vertical direction inside, but for example, a configuration having a gripping hole penetrating in the left-right direction inside the handle, For example, a configuration may be employed in which the handle is provided with an upper gripping recess and a lower gripping recess that are open upward and downward, respectively, into which fingers can be inserted.

  In the above-described embodiment, the stepped portion that can accommodate the caster mounting shaft is provided in the portion where the caster mounting shaft of the leg structure is to be mounted. For example, the caster mounting shaft is provided in the leg structure. It is of course possible to adopt other mounting modes, such as drilling a hole through which the caster mounting shaft is penetrated and welding the caster mounting shaft and the leg structure. .

  In addition, various modifications may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Chair 2 ... Seat 3 ... Leg structure 7 ... Caster mounting shaft 8 ... Caster

Claims (7)

It has a seat, a leg structure that supports the seat, and a caster that can roll around a caster mounting shaft that is fixed to the leg structure and is spaced from the installation floor when seated. A front leg of the leg structure and a leg base connected to the lower end of the front leg, the front end being curved in a side view and extending upward toward the front leg, are integrally formed on the front end of the leg base. The caster mounting shaft is fixedly provided, and at the time of sitting, at least the lower surface of the portion corresponding to the front-rear direction position from the front end of the leg structure to the caster mounting shaft is spaced upward from the installation floor surface. A chair characterized by. The chair according to claim 1, wherein the caster does not interfere with the other chair when stacked on another chair having the same structure or another chair having a structure in which the caster is removed from the other chair. The chair according to claim 1 or 2, wherein a grounding body that is preferentially grounded when seated is provided separately from the caster at a position behind the caster of the leg structure. The chair according to claim 1, 2 or 3, further comprising a backrest provided above the seat and a handle provided behind the backrest. The chair according to claim 4, wherein the handle is provided at an upper end of a back support frame that supports the backrest. The chair according to claim 4 or 5, wherein the handle has a gripping hole penetrating in the vertical direction. The chair according to claim 1, 2, 3, 4, 5 or 6, wherein a step pressing portion capable of accommodating the caster mounting shaft is provided in a portion of the leg structure to which the caster mounting shaft is to be mounted.

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