JP5085635B2 - Chair - Google Patents

Description

  The present invention relates to a chair capable of rocking operation.

  Conventionally, in a chair having a mechanism for rocking the chair body composed of a backrest and a seat, the backrest and the seat are supported by a back support rod and a seat receiving portion, respectively, and the back support rod is used as a support. It is known to have a locking mechanism including a link mechanism that is rotatably mounted and a link member is provided between a seat receiving portion and a support body. In such a case, a mechanical part such as a gas spring is attached between a portion where the back support rod is further extended below the attachment portion with respect to the support on the lower side of the seat portion and another portion of the support. In general, the back support rod is fixed at an arbitrary locking position by restraining the back support rod by the gas spring.

However, in such a case, the place where the gas spring or the like is disposed usually corresponds to a kicking space for the leg of the seated person, so that such a mechanical part is an obstacle or dangerous for the seated person. Sometimes. Moreover, the attachment part with respect to the support body of a back support rod may arrange | position the torsion bar etc. which provide an elastic force, for example as a member for providing force in the direction which raises a back support rod. However, in such a configuration, both a configuration that applies force in the direction of rising to one back support rod and a configuration that constrains it are arranged, so the back support rod is constrained at a certain locking position. However, there has been a problem that it is not possible to sufficiently prevent backlash at the link member and the seat receiving portion constituting the link mechanism .

Therefore, an object of the present invention is to configure a chair that can prevent the rattling of the link mechanism as much as possible .

Therefore, the chair of the present invention includes a chair body provided with a backrest portion and a seat portion, a back support rod that supports the backrest portion, and a support body that supports the chair body via a seat receiving portion that supports the seat portion, In the one provided with a locking mechanism for locking the chair body between the normal position and the rearward tilt position, the back support rod is operable between the rearward tilt position and the normal position, An elastic force is applied so as to return to the normal position side by a return means arranged between the back support rod and the support body, a connecting member is provided between the support body and the seat receiving portion, and A support is rotatably attached to the seat support and the support, and both ends of the connection member are rotatably attached to the seat support and the support, respectively, and the locking mechanism is connected to the connection member and a part of the back support. With front and rear link elements It is configured by a mechanism, and is arranged between the connection member and the support, and acts on a portion other than the connection portion with the seat receiving portion in the connection member by means different from the return means, The connecting member is directly pushed in a direction in which the chair body returns to the normal position .

With such a configuration, the backlash of the link mechanism can be prevented as much as possible.

  As a specific configuration of the locking mechanism, a connection member is provided between the support and the seat receiving portion, and a back support rod is rotatably attached to the rear end portion of the seat receiving portion and the support, respectively. And a locking mechanism that includes a part of the back support rod and a connecting member as a link element.

As a specific aspect of the back support rod, there is one that is bent in an L shape in a side view at the rear of the seat portion.

  Moreover, as the return means capable of performing an appropriate locking operation, it is desirable to apply an elastic force in the direction in which the chair main body returns the back support rod by elastic deformation. Specifically, it can be placed in a small space as a return means, and the reliable operation is to fix a part of the back support rod to the support and to fix the lower part of the back support to the other part. A torsion bar that is fixedly attached.

  The present invention is implemented in the form as described above, and has the following effects.

That is, the chair having the locking mechanism of the present invention includes a chair body provided with a backrest portion and a seat portion, and a support body that supports the chair body through a back support rod that supports the backrest portion and a seat support portion that supports the seat portion. And a locking mechanism for locking the chair body between the normal position and the rearward tilt position, the back support rod is operable between the rearward tilt position and the normal position. In addition, an elastic force is applied so as to return to the normal position side by a return means disposed between the back support rod and the support body, and a connection member is provided between the support body and the seat receiving portion. The back support rod is rotatably attached to the seat receiving portion and the support body, and both end portions of the connection member are rotatably attached to the seat support portion and the support body, respectively. Link elements to the front and back It is constituted by a link mechanism provided, and is arranged between the connection member and the support, and by means other than the return means, the connection member has a portion other than the connection portion with the seat receiving portion. Acting against the above, the connecting member is directly pushed in a direction in which the chair main body returns to the normal position, and the support is supported by a leg portion having a caster that contacts the floor surface. .

Therefore, the play of the link mechanism can be prevented as much as possible .

  As a specific structure of the locking mechanism, a part of the back support rod that is rotatably attached to the rear end of the seat receiving part and the support, respectively, and both ends can be rotated to the front end of the seat receiving part and the support, respectively. In the case of using a link mechanism having a connecting member attached to the link element as a link element, the intended purpose can be achieved with a locking mechanism having a simple structure.

Action | operation explanatory drawing which shows one Embodiment of this invention roughly in a side view state.

  Embodiments of the present invention will be described below with reference to the drawings.

  A chair A1 according to the present embodiment schematically shown in FIG. 1 includes a support body 1 supported by a leg portion 8 having casters 81 that are grounded on a floor surface, a back support rod 2 and a seat attached to the support body 1. It comprises a receiving portion 3 and a chair body 4 comprising a backrest portion 41 and a seat portion 42 having cushioning properties supported by the back support rod 2 and the seat receiving portion 3, respectively. The chair body 4 is configured to be able to perform a rocking operation by a locking mechanism X1 formed between the chair body 4 and the chair 4. In addition, about the leg part 8 and the chair main body 4, since it does not have a special feature, description is abbreviate | omitted.

  Specifically, the support 1 has an opening between the pair of side plates 11, and the lower end 1b is rotatably attached to the upper end of the leg, and the lower end 1b toward the upper end 1a. It is inclined forward and upward. A lower end 2a of the back support rod 2 is rotatably attached to a portion slightly above the lower end 1b, and the connection member 5 is rotated via a pin 52 provided between the side plates 11 on the upper end 1a. Installed as possible.

  The back support rod 2 is bent in an L shape in a side view behind the seat portion 42, further extends an upper end portion (not shown) upward, and has a backrest portion 41 attached to the front side thereof. Thus, after inserting a torsion bar 7 (a shaded portion in the drawing) that can be elastically deformed into a pipe member (not shown) fixed between the side plates 11 of the support 1, both ends thereof are pipe members. The lower end 2a of the back support bar 2 is fixed at a position displaced inward from the end of the torsion bar 7, and the back support bar 2 rotates while twisting the torsion bar 7. Like to do. The torsion bar 7 gives an elastic force to the back support rod 2 in the direction of returning to the normal position side indicated by the solid line in the drawing, that is, the direction of raising the backrest portion 41. It constitutes a return means. It should be noted that the torsion bar is not limited to such a mode, and the torsion bar is fixed to the support at the center and fixed to the lower end of the back support rod, or fixed at one end to the support and at the other end. The same effect can be obtained also by a mode in which is fixed to the lower end of the back support rod.

  Further, the upper end portion 5 a of the connection member 5 is rotatably attached to the front end portion 3 a of the seat receiving portion 3 via a pin 51, and the rear end portion 3 b of the seat receiving portion 3 is further attached to the seat of the back support rod 2. It is rotatably attached via a pin 31 to an intermediate height position below the portion 42. Thus, in this embodiment, the locking mechanism X1 which consists of a link mechanism which makes the range from the lower end part 2a of the connection member 5 and the back support 2 to the pin 31 a link element is comprised. And the gas spring 6 is arrange | positioned between the support body 2 and the connection member 5 as a fixing means for fixing the motion of a link element in arbitrary locking positions within the movable range of this locking mechanism X1. The gas spring 6 includes a shaft 61 and a cylinder 62 that accommodates the shaft 61 so as to be able to project and retract, and is a normal one that can lock the projecting and retracting of the shaft 61 with an arbitrary projecting length. The upper end portion 6a on the 62 side is rotatably attached to the intermediate height position of the connecting member, and the lower end portion 6b on the shaft 61 side is rotatable to a position slightly above the portion where the torsion bar 7 of the support 1 is provided. It is attached to. In addition, the attachment position of the upper end part 6a of the cylinder 62 should just be above the pin 52 which supports the connection member 5 rotatably.

Next, the rocking operation in the chair A1 of the present embodiment will be described. A seated person sits on the seat portion 42 and leans on the backrest portion 41 at the normal position shown by a solid line in FIG. When a load is applied, the chair body 4 moves rearward and downward together with the back support rod 2 and the seat receiving portion 3 as indicated by arrows in the figure. At that time, the torsion bar 7 is twisted between the support 1 and the back support 2 and accumulates elastic force. At the same time, the gas spring 6 also operates to compress the air in the cylinder 62 by immersing the shaft 61 in the cylinder 62 while rotating backward. And the chair main body 4 , the back support rod 2, and the seat receiving part 3 finally move to the back tilt position shown by the imaginary line in the same figure. Meanwhile, when the shaft 61 of the gas spring 6 is locked at an appropriate locking position, the rotation operation of the connecting member 5 is restricted. As a result, the movement of the locking mechanism stops and the chair body 4 is fixed at that position. Can do. Conversely, when the load applied to the chair body 4 is removed at an appropriate locking position including the rearward tilt position and the lock of the gas spring 6 with respect to the shaft 61 is released, the air in the cylinder 62 expands and the shaft 61 protrudes. Then, the connecting member 5 is pushed in the direction in which the chair body 4 returns to the normal position, and the elastic return force stored in the torsion bar 7 acts to return the chair body 4 to the normal position. .

  According to the chair A1 of the present embodiment having the above-described configuration, the mechanical component of the locking mechanism X1 that performs the locking operation of the chair body 4, specifically, the gas that is the fixing means for fixing the chair body 4 at an arbitrary locking position. Since the spring 6 and the torsion bar 7 serving as a return means for applying the force for returning the chair body 4 to the normal position to the back support rod 2 are disposed between the support 1 and the chair body 4, There is no mechanical part in the kicking space of the leg of the seated person that is below the support body 1 below the seat part 4, and the kicking space is widened to ensure the usability and safety of the chair A1. Can be improved. Further, since the gas spring 6 acts on the connecting member 5 and the torsion bar 7 acts on the back support rod 2, a conventional structure in which the fixing means and the returning means are applied to one member. The locking mechanism X1 is less rattling than the one, and the strength against the offset force is improved, so that the chair body 4 can be securely held at an appropriate locking position.

  In particular, the locking mechanism X1 is composed of a connecting member 5 that connects the support 1 and the seat receiving portion 3 and a link mechanism that uses a part of the back support rod 2 as link elements. Thus, the chair body 4 can be reliably rocked. Furthermore, by arranging the gas spring 6 and the torsion bar 7 as described above, it is possible to prevent rattling of the link mechanism as much as possible.

  In the present embodiment, the same effect as described above can be obtained even if the gas spring is disposed between the support and the back support rod and the torsion bar is provided on the attachment portion of the connection member with respect to the support. Various modifications are possible.

Further, as the fixing means and the returning means Ru can also be applied as appropriate other than the gas spring or a torsion bar. The present invention is not limited to the above-described embodiment, and an appropriate configuration can be adopted. In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

A1 ... chair X1 ... locking mechanism 1 ... support 2 ... back support 3 ... seat receiving part 4 ... chair body 5 ... connecting member 6 ... fixing means (gas spring)
7 ... Return means (torsion bar)

Claims (3)

A chair body provided with a backrest and a seat, a back support rod that supports the backrest, a support that supports the chair via a seat support that supports the seat, and the chair body in a normal position and a tilted position And a locking mechanism for locking between
The back support rod is operable between a backward tilt position and a normal position, and an elastic force is applied so that the back support rod is returned to the normal position side by return means arranged between the back support rod and the support. The connecting member is provided between the support body and the seat receiving portion, and the back support rod is rotatably attached to the seat receiving portion and the support body, and both ends of the connecting member are connected to the seat receiving portion and the support body. Each of which is rotatably attached to each other, and the locking mechanism is constituted by a link mechanism including these connecting members and a part of the back support rod as front and rear link elements,
The connecting member is arranged between the connecting member and the support, and acts on a portion other than the connecting portion with the seat receiving portion of the connecting member by means different from the returning means, and directly connects the connecting member. The chair body is pushed in the direction to return to the normal position ,
The chair is characterized in that the support is supported by a leg portion provided with a caster that contacts the floor surface . Connecting members provided with a back支桿seat receiving the rear portion and the support to claim 1 chair, characterized in that each attached rotatably between the support and the seat receiving. The chair according to claim 1 or 2, wherein the back support rod is bent in an L shape in a side view behind the seat portion.

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