Chair

Abstract

To provide a chair capable of reducing a labor related to replacement of a footrest.SOLUTION: A chair 1 includes: a seat part 10 on which a user sits; a leg part 21 supporting the seat part 10 from below; and a footrest part 41 on which a foot of the user is placed. The leg part 21 includes two front legs 21a arranged in a front side and two rear legs 21b arranged in a rear side. The footrest part 41 includes a connection metal fitting 42 detachably attached to the two front legs 21a. The two front legs 21a is inclined downward from upward toward the front side. A plurality of hole portions 21c are formed so as to be arrayed along a downward inclination direction at equal intervals, in a front surface of the front leg 21a. The connection metal fitting 42 includes a lever 44 and a projection 43e. A rear end part of the lever 44 and the projection 43e can be inserted to adjacent hole portions 21c, 21c. The rear end part of the lever 44 engages with the front leg 21a.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a chair. [Background technology]

[0002] 2. Description of the Related Art Conventionally, chairs for playing musical instruments and the like have a function of adjusting the height of the seat on which the user sits to suit the user's physique.

[0003] For example, Patent Document 1 proposes a chair for playing musical instruments in which X-shaped link mechanisms supported by a lower fixed base and an upper movable base are arranged side by side in the longitudinal direction, and these two link mechanisms are connected by a turnbuckle-type bolt consisting of a right-handed thread and a left-handed thread, and by turning a knob located at the tip of the bolt, the seat plate, which is the seating portion located on the movable base, can be raised and lowered.

[0004] According to the chair for playing musical instruments disclosed in Patent Document 1, the height of the chair seat can be adjusted to suit the instrument when playing the instrument. For example, when playing the piano, the height can be adjusted so that the hands are positioned to easily strike the keys. However, when a small person, such as a child, plays the piano, if the chair seat is raised to match the piano keys, the feet do not reach the floor, leaving no place to rest the feet. If the player is a child and there is no place to rest the feet, there is a risk that the player will not be able to concentrate on playing the instrument. Therefore, in the past, a separate footrest was provided and placed in front of the chair so that the child could place their feet on it. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-14477 Summary of the Invention [Problem to be solved by the invention]

[0006] However, because children's physiques vary greatly depending on age and other factors, when multiple children share a chair, it is necessary to change the height of the footrest. Specifically, multiple types of footrests with different heights are prepared, and the footrests are replaced as the performer changes. This may require the footrest to be carried around every time it is replaced. Moreover, if the replaced footrest does not fit the performer, it will have to be replaced again, which further increases the effort required to carry the footrest around.

[0007] The present invention has been made in consideration of such problems, and has as its object to provide a chair that can reduce the effort required for replacing the footrest. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention has the following configuration.

[0009] (1) a seating portion on which a user sits; Legs that support the seat from below; a foot rest portion on which the user places their feet, The leg portion has a plurality of front legs arranged on a front side, which is a side facing a user seated on the seat portion, and a plurality of rear legs arranged on a rear side, the footrest portion has attachment portions that are detachably attached to the plurality of front legs, The plurality of front legs are inclined downward from above toward the front side, and a plurality of holes are formed in the front-facing portions of the front legs at equal intervals along the downward inclination direction, the mounting portion has a plurality of protrusions, the number of which is less than the number of the holes; The chair is characterized in that the multiple protrusions can each be inserted into the hole, and at least one of them engages with the front leg.

[0010] According to the invention (1), a plurality of holes are formed at equal intervals on each of the plurality of front legs, and a plurality of protrusions on the mounting portion of the footrest are inserted into the plurality of holes, with at least one of the protrusions engaging with the front leg of the chair. This makes it difficult for the footrest to come off the front leg, improving the stability of the footrest. Furthermore, because only at least one of the plurality of protrusions is engaged with the front leg of the chair, it is easy to attach and detach the footrest to and from the front leg of the chair, reducing the effort required to change the height of the footrest. In this way, the effort required to replace the footrest can be reduced.

[0011] (2) In (1), one of the plurality of protrusions has a lever member whose rear end is formed in a hook shape and which can swing up and down, and a spring member which constantly biases the lever member, When the plurality of protrusions are inserted into the holes, the lever member is swung in a direction opposite to the bias of the spring member, thereby allowing the rear end portion to be moved to a position where it can be inserted into the plurality of holes, and when the rear end portion is inserted into the holes, the lever member is swung by the bias of the spring member, and the front-rear end portion engages with the edge of the hole portion in the front leg.

[0012] According to the invention (2), an operator inserts the rear end of the lever member into the hole while operating the lever member, and then releases the lever member. The spring member biases the rear end of the lever member, causing the rear end of the lever member to engage with the edge of the hole and maintain that state. This allows the footrest to be easily attached to the front legs by operating the lever member. Furthermore, when removing the footrest from the front legs, the operator operates the lever member to release the engagement between the rear end of the lever member and the edge of the hole, allowing the footrest to be easily removed from the front legs. This makes it possible to easily attach and detach the footrest to and from the chair, reducing the effort required for replacing the footrest. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a chair that can reduce the effort required for replacing the footrest. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a configuration of a chair according to an embodiment of the present invention, viewed obliquely from above. [Figure 2] 1 is a perspective view showing a configuration of a chair according to an embodiment of the present invention, viewed obliquely from below. [Figure 3] FIG. 3 is an enlarged view of the vicinity of the symbol A shown in FIG. [Figure 4] FIG. 4 is a side view of the portion shown in FIG. 3. [Figure 5] FIG. 5 is a perspective view showing a modified example of the connecting fitting 42. As shown in FIG. [Figure 6] FIG. 6 is a side view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the chair of the present invention will be described in detail with reference to the drawings. In the following description, the same or similar components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

[0016] Fig. 1 is a perspective view showing the configuration of a chair according to one embodiment of the present invention, as seen obliquely from above. Fig. 2 is a perspective view showing the configuration of a chair according to one embodiment of the present invention, as seen obliquely from below. In this embodiment, chair 1 is a musical instrument chair on which a user who plays a musical instrument, such as a piano, sits, but is not limited to this, and chair 1 can be applied to chairs for a variety of purposes.

[0017] The chair 1 comprises a seating section 10 on which a user sits, a support section 20 that supports the seating section 10 from below, a lifting section 30 that is fixed to the support section 20 and raises and lowers the seating section 10, an auxiliary section 40 that is attached to the support section 20 and on which a user can place their feet, and an operating section 371 that switches between a locked state that locks the lifting section 30 and an unlocked state that allows the lifting section 30 to be raised and lowered.

[0018] The seating section 10 has a cushion on the upper surface thereof on which the user sits, and its lower surface is connected to the lifting section 30 fixed to the support section 20. In the example shown in Fig. 1, the seating section 10 is formed in a quadrangular shape when viewed from above, but is not limited to this and may be formed in a circular shape or other polygonal shapes.

[0019] The support portion 20 has a plurality of legs 21 (four in the example shown in FIG. 1) extending downward from the lower side near the outer periphery of the seating portion 10 (four corners in the example shown in FIG. 1), and a frame portion 22 connecting the upper ends of adjacent legs 21 to each other.

[0020] The four legs 21 are long, rectangular metal cylinders, consisting of two front legs 21a and two rear legs 21b. When chair 1 is placed in the piano playing area, front legs 21a face the piano, and rear legs 21b are positioned behind front legs 21a. For convenience in the following explanation, the direction of chair 1 facing the piano will be referred to as the front or front side, the opposite direction as the rear or rear side, the vertically upward direction as the upward or upper side, the vertically downward direction as the downward or lower side, the left-hand side when chair 1 is viewed from the piano side as the left or left side, and the right-hand side as the right or right side. In other words, when a user sits on chair 1, they face forward.

[0021] The front legs 21a are bent at their upper ends, so that when these upper ends are fixed to the front corners of the seat 10, the front legs 21a extend obliquely from the upper end to the lower end. That is, the front surfaces of the front legs 21a are inclined downward. A plurality of holes 21c are formed at equal intervals along the inclined surface of the front of the front legs 21a.

[0022] When the upper end of the rear leg 21b is fixed to the rear corner of the seat 10, the rear leg 21b extends vertically downward from the seat 10.

[0023] The auxiliary part 40 includes a footrest part 41 on which a user seated on the seating part 10 places their feet, a connecting fitting 42 for attaching the footrest part 41 to the pair of front legs 21a, 21a, and a rectangular reinforcing plate 50.

[0024] The footrest 41 is a member that includes a flat plate portion 41a that is generally rectangular in plan view and a wall surface portion 41b that surrounds the outer periphery of the flat plate portion 41a, and is formed with a flat front side and a concave rear side. The left-right width of the footrest 41 is set to the length between the outer side surfaces of the front legs 21a, 21a. The two front corners of the flat plate portion 41a are formed in an arc shape, and the flat plate portion 41a is formed in an arc shape that bulges gently forward from the two front corners.

[0025] The wall surface portions 41b extend perpendicularly from the edge of the flat plate portion 41a. The wall surface portions 41b on both the left and right sides of the flat plate portion 41a gradually become higher toward the rear.

[0026] Two corners on the rear side of the flat plate portion 41a are formed with notches 41c, 41c that fit the pair of front legs 21a, 21a, respectively. The length of the rear edge of the flat plate portion 41a is set to the length between the inner side surfaces of the front legs 21a, 21a. In this embodiment, the wall portion 41b does not extend from the edges of the notches 41c, 41c.

[0027] The flat plate portion 41a is formed with flat plate-like ribs 41d and 41e that stand perpendicular to the rear surface of the flat plate portion 41a and extend in two different directions. The ribs 41d and 41e are arranged at equal intervals and are arranged in a diamond-shaped lattice pattern in a plan view. The height of the ribs 41d and 41e is set lower than that of the wall surface portion 41b.

[0028] The connecting metal fitting 42 is a metal fitting for attaching the foot rest portion 41 as an attachment portion to the front leg 21a. The reinforcing plate 50 is a long, rectangular, flat plate member extending in the left-right direction, and is disposed inside the footrest portion 41. Both ends of the reinforcing plate 50 are disposed near the wall surface portions 41b on both the left and right sides of the footrest portion 41, and connecting fittings 42 are fixed to both ends of the reinforcing plate 50.

[0029] Next, the connecting fitting 42 will be described with reference to FIGS. Fig. 3 is an enlarged view of the vicinity of symbol A shown in Fig. 2. Fig. 4 is a side view of the portion shown in Fig. 3. Note that the dotted line indicating hole 21c in Fig. 4 is a line that schematically shows the correspondence between hole 21c formed on the front side of front leg 21a and hole 21c formed on the rear side.

[0030] The connecting fitting 42 comprises a base fitting 43 fixed to the footrest portion 41, a lever 44, a support shaft 45 that rotatably attaches the lever 44 to the base fitting 43, and a torsion spring 46 that biases the lever 44 in the rotational direction.

[0031] The base metal fitting 43 includes a flat fixing portion 43a that is fixed to the reinforcing plate 50 on the back side of the footrest portion 41, and a flat inclined portion 43b that extends obliquely relative to the fixing portion 43a. The fixing portion 43a is fixed to the front side of the cutout portion 41c so that an edge portion extending in the left-right direction at the cutout portion 41c coincides with the boundary line between the fixing portion 43a and the inclined portion 43b.

[0032] The angle of inclination between the fixed portion 43a and the sloped portion 43b is set to be the same as the angle of the front leg 21a relative to the horizontal direction. Therefore, when the front legs 21a, 21a are fitted into the cutout portions 41c, 41c of the footrest portion 41 and the sloped portion 43b is brought into contact with the front surface of the front leg 21a, the footrest portion 41 extends forward in the horizontal direction.

[0033] The sloped portion 43b has a rectangular portion 43c formed on one side thereof, which extends forward at a right angle to the sloped portion 43b. The rectangular portion 43c is formed by forming a notch in a portion near the boundary between the fixed portion 43a and the sloped portion 43b, and then bending a portion of an imaginary line extending from the end of the notch parallel to the side of the sloped portion 43b. A locking piece 43d is formed in the center of the rectangular portion 43c, extending toward the sloped portion 43b.

[0034] Here, rectangular portion 43c of base metal fitting 43 fixed to the left side of footrest portion 41 is formed on the right side of inclined portion 43b, and locking piece 43d extends to the left. Rectangular portion 43c of base metal fitting 43 fixed to the right side of footrest portion 41 is formed on the left side of inclined portion 43b, and locking piece 43d extends to the right.

[0035] A support shaft 45 is fixed to the rectangular portion 43c near the upper side of the locking piece 43d. The support shaft 45 is parallel to the boundary line between the fixed portion 43a and the sloped portion 43b and extends toward the sloped portion 43b. A lever 44 and a torsion spring 46 are inserted into the support shaft 45.

[0036] A protrusion 43e that can be inserted into hole 21c is formed at the center of the lower end of inclined surface 43b. This protrusion 43e is formed by bending and protrudes rearward from inclined surface 43b. A rectangular elongated hole 43f is formed at the center of the flat surface of inclined surface 43b. This elongated hole 43f is formed above protrusion 43e and extends perpendicular to the boundary line between fixing portion 43a and inclined surface 43b. The longitudinal length of elongated hole 43f is longer than the diameter of hole 21c. The distance from protrusion 43e to the center of elongated hole 43f is set to be the same as the spacing between adjacent holes 21c. Therefore, when the front legs 21a, 21a are fitted into the notches 41c, 41c of the footrest 41, the inclined portion 43b is brought into contact with the front surface of the front leg 21a, and the protrusion 43e is inserted into the hole 21c, the center of the hole 21c directly above this hole 21c and the center of the long hole 43f approximately coincide with each other.

[0037] Lever 44 is made of a V-shaped flat member, and a support shaft 45 is inserted approximately in the center of the curved portion of the V-shape, and is rotatably supported by support shaft 45. At this time, the rear end of lever 44 is loosely inserted into elongated hole 43f and protrudes rearward from inclined portion 43b. The front end of lever 44 is formed in a hook shape and can be inserted into hole 21c. This hook-shaped portion faces upward. In this way, protrusion 43e protruding rearward from inclined portion 43b and the rear end of lever 44 correspond to the multiple protrusions in this invention.

[0038] The torsion spring 46 includes a cylindrically wound coil portion and straight portions extending from both ends of the coil portion.

[0039] When assembling the connecting fitting 42, first, the hole (not shown) of the lever 44 is inserted into the support shaft 45, and then the coil portion of the torsion spring 46 is inserted into the support shaft 45. After that, the rear end of the lever 44 is loosely inserted into the elongated hole 43f, and the support shaft 45 is fixed to the rectangular portion 43c. Then, one straight portion of the torsion spring 46 is engaged with the engaging piece 43d, and the other straight portion is engaged with the lever 44.

[0040] At this time, the two straight portions of the torsion spring 46 are locked in a state where they are elastically deformed by being brought close to each other. Therefore, a biasing force that constantly urges the two straight portions away from the torsion spring 46 acts on the lever 44. As a result, the rear end of the lever 44 constantly tries to rotate upward, and is therefore maintained in a state in which it abuts against the upper part of the elongated hole 43f in the inclined surface portion 43b.

[0041] The auxiliary part 40 is assembled by fixing the connecting metal fittings 42 configured in this manner to both the left and right sides of the reinforcing plate 50 fixed to the footrest part 41.

[0042] Next, the attachment of the auxiliary part 40 will be described. The auxiliary unit 40 is attached to the chair 1 when the player's feet do not touch the floor when seated on the chair 1, such as when the player is a child.

[0043] First, the worker determines the mounting position (height) of the footrest 41 relative to the front legs 21a, and inserts the protrusions 43e into the nearby holes 21c. Next, while holding the footrest 41, the worker raises the front ends of the levers 44, lowering them to a position where the rear ends of the levers 44 can be inserted into the holes 21c. While maintaining this position, the worker rotates the footrest 41 rearward around the protrusions 43e, pivoting the footrest 41 so that the front legs 21a fit into the notches 41c of the footrest 41, bringing the slope 43b into contact with the front surface of the front leg 21a and inserting the rear ends of the levers 44 into the holes 21c. When the worker releases his / her hands, the levers 44, 44 rotate due to the bias of the torsion spring 46, and the rear ends of the levers 44, 44 engage with the upper edges of the holes 21c, 21c in the front legs 21a, 21a. This fixes the auxiliary part 40 to the chair 1.

[0044] To remove the auxiliary part 40 from the chair 1, the worker holds the footrest part 41 and raises the front ends of the levers 44, 44, causing the rear ends of the levers 44, 44 to move downward, releasing the engagement with the upper edge of the hole 21c. By pulling the footrest part 41 forward while maintaining this released state, the auxiliary part 40 can be removed.

[0045] In this embodiment configured as described above, a plurality of holes 21c are formed in each of the two front legs 21a and arranged at equal intervals. The rear end and protrusion 43e of the lever 44 of the connecting fitting 42 of the footrest 41 are inserted into the plurality of holes 21c, and the rear end of the lever 44 engages with the upper edge of the hole 21c in the front leg 21a. This makes it difficult for the footrest 41 to come off the front leg 21a, improving the stability of the footrest 41. Furthermore, by engaging the rear end of the lever 44 with the upper edge of the hole 21c in the front leg 21a, the footrest 41 can be easily attached and detached, reducing the effort required to change the height of the footrest 41.

[0046] The auxiliary part 40 is supported by the front legs 21a in a cantilevered manner. The front legs 21a extend obliquely forward from the upper end to the lower end. This allows the auxiliary part 40 to abut against the front legs 21a, and the part that supports the auxiliary part 40 to be positioned forward of the rear edge directly below the footrest part 41 (inside the footrest part 41 when viewed from above), thereby improving the stability of the auxiliary part 40.

[0047] According to this embodiment, when an operator inserts the rear end of the lever 44 into the hole while operating the lever 44 and then releases the lever 44, the force of the torsion spring 46 causes the rear end of the lever 44 to engage with the edge of the hole 21c in the front leg 21a, and this state is maintained. This makes it possible to easily attach the footrest 41 to the front leg 21a by operating the lever 44. Furthermore, when removing the footrest 41 from the front leg 21a, the operator operates the lever 44 to release the engagement between the rear end of the lever 44 and the edge of the hole 21c in the front leg 21a, thereby easily removing the footrest 41 from the front leg 21a. In this way, the footrest 41 can be easily attached and detached from the chair, reducing the effort required to change the position of the footrest 41.

[0048] Although one embodiment of the present invention has been described above, the embodiments of the present invention are not limited to the above-described embodiment. For example, in the above-described embodiment, the lever 44 is disposed above the protrusion 43e. However, the lever 44 may be disposed at the position of the protrusion 43e in Fig. 4, and the protrusion 43e may be disposed at the position of the lever 44 in Fig. 4. This allows the hole 21c corresponding to the rear end of the lever 44 to be visually confirmed when the protrusion 43e is inserted into the hole 21c, facilitating the operation of aligning the rear end of the lever 44 with the hole 21c.

[0049] Furthermore, in the above-described embodiment, the protrusion 43e and the rear end of the lever 44 are inserted into adjacent holes 21c, but the protrusion 43e may be inserted into a hole 21c that is two or three holes away from the hole 21c into which the rear end of the lever 44 is inserted. This makes it possible to more stably attach the footrest 41 to the front leg 21a, and reduces the likelihood of the footrest 41 coming off the front leg 21a when a strong impact is applied to the footrest 41, such as when a child jumps on the footrest 41.

[0050] Furthermore, connecting fitting 42 may be configured as shown in Figures 5 and 6. Figure 5 is a perspective view showing a modified example of connecting fitting 42, and Figure 6 is a side view of Figure 5. Note that the dotted line indicating hole 21c in Figure 6 is a line that schematically shows the correspondence between hole 21c formed on the front side of front leg 21a and hole 21c formed on the rear side.

[0051] 5 and 6 includes a base metal fitting 43, a long screw 47, and a nut 48 that screws onto the screw 47, and does not include the lever 44, support shaft 45, and torsion spring 46 of the connecting metal fitting 42 shown in Figures 3 and 4. The hole 21c of the front leg 21a is a through-hole that passes through from the front surface to the rear surface.

[0052] The base metal fitting 43 does not have the rectangular portion 43c of the base metal fitting 43 shown in Figures 3 and 4, and is equipped with a reinforcing portion 43g made of a triangular flat plate located at one corner of the fixed portion 43a and the sloped portion 43b. A protrusion 43e that can be inserted into the hole 21c is formed in the center of the lower end of the sloped portion 43b. Also, a hole (not shown) into which a screw 47 can be inserted is formed in place of the elongated hole 43f. The distance between this hole and the protrusion 43e is equal to the distance between adjacent holes 21c, 21c.

[0053] The screw 47 is longer than the width of the front leg 21a in the front-rear direction, and the outer diameter of the screw head of the screw 47 is larger than the inner diameter of the hole 21c.

[0054] When attaching the auxiliary unit 40 to which the connecting fitting 42 configured as described above is fixed to the front leg 21a, first, the attachment position (height) of the footrest 41 relative to the front legs 21a is determined, and the protrusions 43e are inserted into the hole 21c located nearby. Next, the footrest 41 is rotated rearward around the protrusions 43e to align the hole 21c (not shown) in the sloped portion 43b with the hole 21c. While maintaining this position, a screw 47 is inserted into the hole 21c from the rear of the front leg 21a, and the front end of the screw 47 protrudes from the hole 21c (not shown) in the sloped portion 43b. Then, a nut 48 is screwed onto the front end of the screw 47 protruding from the hole 21c (not shown) in the sloped portion 43b. This attaches the footrest 41 to the front leg 21a.

[0055] The present invention is not limited to the above-described embodiment. [Explanation of symbols]

[0056] 1 chair 10 Seating area 20 Support part 21 Legs 21a front leg 21b Hind legs 21c hole 22 Frame 30 Lifting section 40 Auxiliary part 41 Footrest 41a Flat plate part 41b Wall section 41c Notch 41d, 41e Ribs 42 Connecting fittings 43 Base metal fittings 43a Fixed part 43b Slope section 43c Rectangular part 43d Locking piece 43e protrusion 43f long hole 43g Reinforcement 44 Lever 45 Support shaft 46 Torsion spring 47 Screw 48 Nut 50 Reinforcement plate 371 Operation section

Claims

1. a seating portion on which a user sits; Legs that support the seat from below; a foot rest portion on which the user places their feet, The leg portion has a plurality of front legs arranged on a front side, which is a side facing a user seated on the seat portion, and a plurality of rear legs arranged on a rear side, the footrest portion has attachment portions that are detachably attached to the plurality of front legs, The plurality of front legs are inclined downward from above toward the front side, and a plurality of holes are formed in the front-facing portions of the front legs at equal intervals along the downward inclination direction, the mounting portion has a plurality of protrusions, the number of which is less than the number of the holes; The chair is characterized in that the plurality of protrusions are each insertable into the hole, and at least one of the protrusions engages with the front leg.

2. one of the plurality of protrusions has a lever member whose rear end is formed in a hook shape and which can swing up and down, and a spring member which constantly biases the lever member; The chair of claim 1, characterized in that when the multiple protrusions are inserted into the holes, the lever member is swung in a direction opposite to the force from the spring member, thereby moving the rear end portion to a position where it can be inserted into the multiple holes, and when the rear end portion is inserted into the holes, the lever member is swung by the force from the spring member, and the front rear end portion engages with the edge of the hole portion in the front leg.

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