JP2010051687A - Rocking chair with armrest apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve usability of a rocking chair having an armrest apparatus suitable for keyboard operation and mouse operation. <P>SOLUTION: The armrest apparatus 7 includes an elbow strut 21, a lifting/lowering body 22, and an elbow rest 23. The elbow rest 23 slides in the longitudinal direction without resistance. The elbow strut 21 is mounted on a seat receiving part 2 to freely tilt back and forth and biased to tilt frontward. Accordingly, the chair can be put deeply into a desk under the condition that the elbow rest 23 keeps contact with a ceiling plate D of the desk. Therefore, a user can greatly move his or her body back and forth while his or her arm supported by the armrest apparatus. Since a backrest 4 tilts backward from the center of the vertical midway, the position of his or her upper body does not change too much even if the chair rocks, so that the user can operate a keyboard or the like. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rocking chair with an armrest device.

  An armrest device for a chair is often provided for resting an arm, but it has also been proposed to function as an auxiliary tool for work. The most common is to reduce the burden when using OA equipment such as a personal computer. As an example, Patent Document 1 attaches an arm that can be swiveled horizontally to the elbow post, and puts the arm on the arm. It is disclosed that it can be horizontally rotated.

In this patent document 1, since the elbow rest can move freely within a certain range, when a person performs a mouse operation or a keyboard operation with the arm placed on the elbow rest, the arm rest can be freely placed with the arm placed on the elbow rest. It can be moved horizontally. That is, fatigue of the arm can be reduced by the elbow rest following the movement of the arm (hand).
JP 2001-161491 A

  Now, PC and CAD operations are mainly divided into keyboard operations and mouse operations. However, when a person sits on a chair and performs keyboard operations or mouse operations, it can be said that there is an arm position that is easy to operate (which arm is There are individual differences in whether the keyboard is easy to operate when in position.) Also, since the arm is a part of the body, the distance between the body and the desk is also an important factor, and this is also the relationship between the chair and the desk.

  However, the conventional armrest devices for personal computers including Patent Document 1 focus on the ability to follow the movement of the arm, but there is no viewpoint of holding the arm at a position where it can be easily operated, such as a keyboard. For this reason, it can be said that there is still room for improvement in terms of usability.

  Furthermore, it is often seen that a mouse operation is performed in a rocking state in a rocking chair whose backrest tilts backward against the spring means. In this case, in a normal rocking chair, the upper body moves greatly backwards when rocking, so the arm position and side view posture differ between the non-locking state (neutral state) and the rocking state. It can only be operated, and it can be said that it is not assumed that the keyboard is operated or the writing operation is performed in the locked state.

  In addition, when a person sitting on a chair looks at a monitor (display) on a desk, the normal rocking chair tends to look upward due to a large backward tilt of the upper body of the person in the locked state. In order to see it naturally, the head (face) has to be stood up, which has the problem that the neck and shoulders are easily tired.

  In short, the conventional rocking chair was designed based on the idea that people would rest in a rocking position and basically do not work. It can be said that there was no idea to make it possible. The present invention has been made to improve these current situations.

  The present invention has various aspects, each having its own characteristics. Of these, the invention of claim 1 forms the core of the present invention. A chair according to the present invention includes a seat on which a person sits, a backrest that tilts backward against a spring means when the seated person leans, and a seat And an armrest device that can perform a desktop work with the arm placed on the arm, and the armrest device is disposed so as to be pivotable back and forth.

  A chair according to a second aspect of the present invention is the chair according to the first aspect, wherein a seat receiving portion for supporting the seat and the backrest is disposed below the seat, and the armrest device is more The armrest device is pivotably attached to the seat receiving portion with the pivoting fulcrum positioned in the front position, and the armrest device is pivoted in the range of both the front and rear sides across the vertical line. The angle of turning backward from the vertical line is larger than the angle of turning forward from the line. According to a third aspect of the present invention, in the first or second aspect, the armrest device is urged in the forward rotation direction by the urging means.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the backrest and the seat are in a rocking state where a seated person leans against the backrest. "The seat moves forward as a whole and descends" "The seat moves forward as a whole and the part closer to the rear tilts backward" "The distance between the backrest and the rear end of the seat is kept constant" 3 The backrest is set so as to descend while tilting backward with the vicinity of the upper surface of the armrest device as a virtual center.

  According to a fifth aspect of the present invention, as a further preferred aspect, in the third or fourth aspect of the present invention, the armrest device is further provided with a locking means that automatically holds the armrest device in a state of being tilted backward against the biasing means. .

  According to the invention of claim 1, since the armrest device can be rotated back and forth, the position of the arm with respect to the desk can be changed back and forth with the position of the chair fixed, and the armrest device can be placed on the front surface of the desk top plate. The front / rear position of the body can be greatly changed while maintaining the state in which the arm is supported by the armrest device, such as the chair being put deeply into the desk in the state of being touched. Accordingly, it is possible to change the position of the hand greatly according to preference or the like by operating the keyboard or mouse at a position from the front of the tabletop or operating at a position behind the desk top board. In summary, the range in which the arm can be moved back and forth with the arm supported by the armrest device can be widened.

  Furthermore, when a person operates a keyboard or mouse, the hand frequently moves back and forth, but since the armrest device rotates back and forth, the arm can be moved back and forth while being mounted on the armrest device. Arm and shoulder fatigue can be significantly suppressed.

  Also, since the armrest device can be rotated so as to follow the tilt after the backrest, the position and posture of the arm relative to the body when the seated person transitions between the non-locking state and the locking state with the arm resting on the backrest. As a result, desk work such as mouse operation can be performed without a sense of incongruity even in a locked state.

  Furthermore, when the armrest device is used for assisting keyboard operation or mouse operation, the upper surface of the armrest device is usually located on the upper surface of the tabletop, so if the armrest device is fixed, When entering into the desk when not in use, the armrest device hits the table top plate and cannot enter deeply. Thus, the chair can be inserted deeply into the desk when not in use.

  Now, when performing a task such as keyboard operation or mouse operation with a person sitting on a chair, it is almost always done with the elbows slightly out of the torso. It can be said that it is easy to move left and right. And when the elbow is placed slightly in front of the torso, it can be said that the seated person's arm (one arm) is located at the front part of the seat, but in that case, Because it is slightly inclined and its hands are stretched slightly forward, it cannot be said that there is no burden on the body. However, if the structure of Claim 2 is adopted, since the armrest device is displaced near the front end of the seat, the arm is supported stably even in a slightly extended state, and as a result, the arm is easy to move. It can be stably supported in an easy-to-work state.

  Furthermore, since the armrest device tilts rearward greatly with respect to the vertical line, it has a high followability during locking (and is therefore suitable for a type in which the backrest moves backward during locking). In addition, since the armrest device tilts forward (ie, tilts forward) with respect to the vertical line, the armrest device tilts forward due to the downward load acting on the armrest device. Excellent posture stability (The armrest device does not tilt backwards with a sharp force with a downward force applied to the arm.)

  As described above, it is possible to make the relative position of the armrest device and the desk constant by applying the armrest device to the front surface of the table top plate. Even if there is a slight difference, the armrest device is brought into contact with the front surface of the tabletop automatically by the biasing means, so that it is particularly convenient.

  Further, according to claim 4, the seat does not simply move forward when locking, but the rear part tilts backward while moving forward as a whole, so that the upper body of the person tends to lock while sinking, thereby achieving a high fit. Sex can be obtained.

  Further, in claim 4, the backrest is tilted backward so that the upper end of the backrest moves backward and the lower end moves forward. However, the position of the person's head does not change so much, and as a result, the distance between the monitor and the head (face) is prevented from widening, and the monitor can be easily viewed. In addition, since the distance between the upper body and the desk does not change much even when locking, it is possible to perform locking while performing keyboard operation or mouse operation without any trouble. Thus, it can be said that a person's physical burden can be remarkably reduced by performing a work comfortably in a rocking posture.

  If it comprises like Claim 5, the usability in a locking state will become good. In particular, when an urging means for urging the armrest device in the forward tilt direction is provided, the armrest device does not suddenly tilt forward in the locked state, so that it can be said that the usability is particularly good. It is possible to use an operating tool such as a button to release the lock of the armrest device. However, from the viewpoint of ease of operation, the armrest device is held to some extent by holding the locked state with elastic force. It is preferable that the lock is released by applying a force.

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 14 show a first embodiment (main embodiment), and FIG. 15 and subsequent drawings show other embodiments. Hereinafter, the description will be made sequentially. In the following description, the terms “front and rear”, “front”, “rear”, and “left and right” are used to indicate directions, but these terms are based on the posture of the person who is seated. “Front view” is the direction facing the seated person.
(1). Outline of First Embodiment FIG. 1 is an overall schematic side view. First, an outline will be described based on FIG. This embodiment is applied to a so-called swivel chair for office use, and the chair has, as main elements, a leg support 1 made of a gas cylinder, a seat receiving portion 2, a seat 3, a backrest 4, a back support 5, a back support 6, It has an armrest device 7. A lumbar support 8 is disposed between the back strut 5 and the backrest 4 so as to push the portion to which the seated person's waist hits forward. The lumbar support 8 is supported by the back strut 5 so that the height can be adjusted from the back. ing.

  The leg strut 1 constitutes a part of the leg device, and the leg strut 1 is fitted to the center of a leg main body having a plurality of (usually five) branch legs extending radially. The seat receiving portion 2 includes a base 9 fixed to the upper end of the leg support 1, a first intermediate fitting 11 that is slidably attached to the base 9 via a first pin (first support shaft) 10, and a first intermediate fitting 11. The first intermediate fitting 11 has a second intermediate fitting 12 connected to the rear end portion of the left and right laterally long second pin (first support shaft) 13 at the rear end of the intermediate fitting 11, and the seat 3 is connected to the first intermediate via the outer shell 14. It is supported by the metal fitting 11 and the second intermediate metal fitting 12. The seat receiving portion 2 further includes a lower bracket 15 fixed to the lower surface of the base 8, and the back support 6 is fixed to the lower bracket 15.

  The first pin 10 is slidably fitted into a first elongated hole 16 that is formed in the base 9 in the front and rear longitudinally and horizontally, and the second pin 13 is also formed in the base 9 in the front and rear longitudinal and horizontally oriented first. 2 is fitted in the long hole 17 so as to be slidable. Therefore, the first intermediate fitting 11 and the second intermediate fitting 12 and the outer shell 14 and the seat 3 supported by the first intermediate fitting 11 and the seat 3 can slide back and forth, and the second intermediate fitting 12 is centered on the second pin 13. And can tilt.

  The outer shell 14 is separated into a first portion 14a that occupies about 2/3 of the front and a second portion 14b that occupies about 1/3 of the rear, and the first portion 14a is separated from the first intermediate fitting 11. The second portion 14 b is attached to the second intermediate metal fitting 12. Further, the seat 3 is also composed of a first portion 3a occupying a range of about 2/3 of the front side and a second portion 3b occupying about 1/3 of the back side. 3b is continuous so that it can be bent so as to tilt backward with respect to the first portion 3a.

  The first portion 3 a of the seat 3 is fixed to the first portion 14 a of the outer shell 14, and the second portion 3 b of the seat 3 is fixed to the second portion 14 b of the outer shell 14. Therefore, the seat 3 slides back and forth as a whole, and the second portion 3b can tilt backward with respect to the first portion 3a in a side view. In addition, it can be said that the ratio of the front-rear dimensions of the first portion 3a and the second portion 3b is preferably about 5: 5 to 7: 3.

  The back surface of the backrest 4 near the upper end is fixed to the upper end of the back support 5, and the lower end of the backrest 4 is provided with a downward stopper 18 a, and the downward stopper 18 is provided on the back support 5. It is in contact with the lateral stopper 18b so that it can move up and down from behind. For this reason, the protrusion mode of the backrest 4 can be changed by moving the lumbar support 8 up and down.

  A guide body 19 is fixed to a portion of the back column 5 near the upper end (approximately the upper and lower middle portion of the backrest 4), and this guide body 19 is slidable up and down on a guide pin 20 provided at the upper end of the back support 6. It is fitted. Therefore, when the seated person leans on the backrest 4, the backrest 4 descends at the front end while tilting so that the upper end is retracted and the lower end is advanced, and the second portion 3b is moved forward while the seat 3 is advanced as a whole. Tilt backwards.

  The armrest device 7 includes an elbow post 21 fixed to the lower bracket 15, an elevating body 22 attached to the elbow post 21 so as to be adjustable in height, and an elbow rest 23 attached to the upper end of the elevating body 22. ing. The elbow rest 23 has an elongated shape in plan view, and is attached to the lifting body 22 so as to be able to turn horizontally. Further, the elbow strut 21 is attached to the lower bracket 15 so as to be pivotable back and forth. More precisely, when it is fully rotated forward, it tilts forward at a slight angle θ1 with respect to the vertical line, and when it is fully tilted backward, it tilts backward at an angle θ2 larger than the forward tilt angle θ1. It is supposed to fall back. The overall rotation angle (θ1 + θ2) is set to about 25 ° (20 to 30 ° is preferable).

  When a seated person performs a work such as a keyboard while keeping his arm on the elbow rest 23, the height of the elbow rest 23 must be slightly higher than D of the tabletop, but the elbow or device 7 If it is a fixed type that does not swing, the elbow rest 23 can be used for the top board D and the chair cannot be brought deeply into the desk. On the other hand, in this embodiment, since the armrest device 7 tilts (rotates) back and forth, the chair can be deeply inserted into the desk. As a result, a favorite work position can be selected.

  The armrest device 7 is biased forwardly by an absorber 24 in which a spring is incorporated. Further, the armrest 23 is urged by the posture holding device built in the armrest device 7 so that one end thereof returns to the horizontally long posture positioned above the seat 3. Further, the elbow rest 23 can be slid without resistance in the longitudinal direction (left-right direction) in the landscape orientation. Furthermore, the elbow rest 23 is set so that the posture is maintained in a non-longitudinal posture extending in the front-rear direction.

(2) Details of Seat Receiving Part Next, the detailed structure of the seat receiving part 2 and the seat 3 will be described with reference to FIGS. First, details of the seat receiving portion 2 will be described. 2 is a longitudinal side view, FIG. 3 is a plan view showing the outer shell 14 in phantom lines, FIG. 4 is a separated plan view of the outer shell 14 and the seat inner shell 26, and FIG. 6 is a sectional view taken along line VI-VI of FIG. 4 in a state where the whole is displayed, FIG. 7 is a sectional view taken along line VII-VII of FIG. 4 in a state where the whole is displayed, and FIG. FIG. 9 is a sectional view taken along line IX-IX in FIG.

  For example, as can be understood from FIG. 6, the base 9 is in the form of an upwardly open bowl (or box), and the auxiliary bracket 27 is fixed to the inner surface of the rear portion by welding, and the bush fixed to the base 9 and the auxiliary bracket 27. The upper end of the leg support 1 is fitted to 28. Although not shown, a lever for operating the push valve of the leg column 1 is attached to the seat receiving portion 2.

  For example, as shown in FIG. 6, the first intermediate fitting 11 has a U-shaped opening facing the base 9 from above, and the first pin 10 and the second pin 13 penetrate the side plate 11a. For example, as shown in FIGS. 2 to 5, the first long hole 16 and the second long hole 17 are formed in the side plate 9 a of the base 9. A resin bush is attached to the first elongated hole 16, but a bush can also be attached to the second elongated hole 17.

  For example, as shown in FIG. 2, the base 9 has a front plate 9b, a front spring receiver 29 fixed to the front plate 9b with screws, and a rear spring receiver 30 supported from behind by the first pin 10. A locking spring 31 is interposed between the two. A rearward opening groove into which the first pin 10 is fitted is formed in the rear spring receiver 30. Further, the bottom plate of the base 9 has a step portion 9 at a portion below the front and rear spring receivers 29 and 30 and the rocking spring 31, and the front and rear spring receivers 29 and 30 are held non-rotatably at this step portion.

  As shown in FIG. 6, the lateral width of the first intermediate fitting 11 is considerably larger than the lateral width of the base 9. On the other hand, the lower bracket 15 has an upward U-shape and has the same width as the first intermediate fitting 11, and the horizontal portion 6 a of the back support 6 is welded to the left and right ends of the lower bracket 15. The back support 6 is made of steel pipe, but can be made of sheet metal or die cast.

  The second intermediate fitting 12 is in the form of a U-shaped opening having a top plate and left and right side plates 12a. The left and right side plates 12a are located outside the first intermediate fitting 11 and are second pins 13. Penetrates the side plate 12a. The left and right side plates 12a protrude forward from the top plate, and the second pin 13 passes through the forward protrusion.

(3). Seat structure and attachment means As can be understood from FIGS. 6 and 7, the outer shell 14 as a whole has a shallow tray-like shape opened upward in a front view, and is shown in FIG. As described above, the rear end portion has a wall shape that rises while gently curving upward. On the other hand, the seat 3 has a structure in which a cushion 32 is stretched on the upper surface of the seat inner shell 26, and the seat inner shell 26 as a whole has a tray-like shape with a shallow upward opening when viewed from the front. The cushion 32 is covered from above with a skin material (not shown).

  In addition, as shown in FIG. 4, the seat inner shell 26 is formed with a large number of slits 33 centering on the portion where the body pressure of the seated person acts strongly. It is allowed to stretch and deform downward due to body pressure, and as a result, high fit is obtained. The seat inner shell 26 is separated into a first portion 26a and a second portion 26b corresponding to the seat 3, thereby allowing the seat 3 to be bent. The center line (fold line) of the bending of the seat 3 is set around the place where the seated person's tailbone hits (or slightly before it).

  In the present embodiment, the cushion 32 is continuous throughout, but the cushion 32 can also be separated into the first portion and the second portion, and the entire seat 3 can be separated. The outer shell 14 and the seat inner shell 26 are injection molded products made of a resin such as polypropylene.

  As shown in FIGS. 4 and 6, the seat inner shell 26 and the outer shell 14 are integrally connected by fitting a male engaging portion 34 and a female engaging portion 35 provided at the left and right end portions thereof. ing. The male engaging portion 34 and the female engaging portion 35 are connected to each other when the female engaging portion 35 is fitted into the male engaging portion 34 from above and then the seat inner shell 26 is slid rearward. They are engaged so that they cannot be removed vertically. Of course, the fixing method of both can employ | adopt the forced fitting from a simple up-down direction, and can also employ | adopt the fixation using fasteners, such as a screw.

  As shown in FIG. 2, a pair of left and right front engaging claws 36 that are fitted to the top plate of the first intermediate fitting 11 from the front are formed in a portion near the front end of the first portion 14 a in the outer shell 14. Further, as shown in FIG. 3, the first intermediate fitting 11 is formed with a front notch portion 37 into which the front engagement claw 36 is fitted so that it cannot be displaced left and right. A rear stopper 39 is formed at the rear end portion of the first portion 14 a of the outer shell 14 so as to be fitted into the rear cutout portion 38 formed at the rear end of the first intermediate fitting 11. Therefore, the first portion 14a of the outer shell 14 is held by the first intermediate fitting 11 so that it cannot be displaced back and forth and left and right and cannot be pulled upward.

  On the other hand, as shown in FIGS. 2 and 3, a stopper plate 41 protruding backward from the top plate is fixed to the lower surface of the top plate of the second intermediate fitting 12 with screws 42, and the rear end of the stopper plate 41 On the edge, two left and right cutouts 43 are formed. On the second portion 14b of the outer shell 14, rear engagement claws 44 are formed that fit into the cutouts 43 of the stopper plate 41 from the rear side. Has been. Therefore, the outer shell 14 is held by the front and rear engaging claws 36 and 44 so as not to be pulled upward. In assembling, after setting the outer shell 14 to the intermediate fittings 11 and 12, the stopper plate 41 is fitted into the rear engagement claw 44, and then the stopper plate 41 is fixed to the first intermediate fitting 12 with screws 42. Become.

  As shown in FIGS. 4 and 7, the first portion 12a and the second portion 12b of the outer shell 14 are integrally continuous via the left and right hinge portions 12c. The hinge portion 12c is in a horizontal posture when viewed from the front, and the outer shell 14 is bent around the hinge portion 12c. In other words, the second portion 12b tilts backward with the hinge portion 12c as a fulcrum.

  FIG. 8 shows an example of a cross-sectional shape of the hinge portion 12c. In (A), the thickness is made equal to both the portions 12a and 12b without any special work. In (B), a trapezoidal groove (or V-groove) is formed on the lower surface to reduce the thickness, and in (C), a trapezoidal groove (or V-groove) is formed on the upper surface to reduce the thickness. In (B) and (C), it becomes easy to bend. A large number of ribs 45 extending in the vertical and horizontal directions are formed on the lower surfaces of both portions 14a and 14b constituting the outer shell 14.

(4). Elbow strut mounting structure For example, as shown in FIGS. 3, 5, and 9, the elbow strut 21 has an inward horizontal portion 21 a, and the horizontal portion 21 a is formed on the side surface of the lower bracket 15. A side bracket 46 fixed by welding is attached to the side bracket 46 via a bush 46a so as to be able to turn back and forth. A downward arm 47 is fixed to a portion of the horizontal portion 21 a located outside the side bracket 46, and the absorber 24 can be rotated relative to the lower end of the downward arm 47 and the side bracket 46 via pins 48 and 49. It is connected to. The side bracket 46 has a hole (not shown) for allowing the absorber 24 to escape.

  A gas cylinder may be used in place of the absorber 24. In this case, an operating means for operating the push valve of the gas cylinder is provided so that the operating means can be remotely operated by a wire, and an operation tool such as a button or a lever for pulling the wire is provided, for example. It is also possible to provide the elbow rest 23 or the lifting body 22. In this way, the elbow strut 21 can be fixed in an arbitrary posture, or can be freely switched to a state of swinging back and forth, which improves usability.

(5). Back Structure Next, the backrest 4 and its mounting structure will be described with reference to FIGS. 10 and 11 in addition to the previous drawings. 10 is a rear view, FIG. 11A is a longitudinal side view, and FIG. 10B is a separated sectional view of the waist. As shown in FIG. 11, the backrest 4 has a resin-made back inner shell 51 and a cushion 52 stretched on the front surface thereof, and the cushion 52 and the back inner shell 51 are covered with a bag-like skin material. ing.

  As shown in FIG. 10, two back struts 5 are arranged on both the left and right sides of the vertically long center line, and left and right horizontally long upper members 5 a are fixed to the upper ends of the back struts 5. A back inner shell 51 is fixed to 5a. As shown in FIG. 11, the back inner shell 51 is integrally formed with a back rib 53 that overlaps the upper member 52 of the back column 5, and the back rib 53 is fixed to the upper member 52.

  The lower portions of the left and right back struts 5 are inclined backward, while the rear surface of the second intermediate fitting 12 is welded with a rear plate 54 inclined in a side view, and the back struts 5 are welded to the rear plate 54. ing. The lateral stopper 18b is fixed to the left and right back posts 5 by welding. Although not shown, the left and right back struts 5 are connected by a reinforcing member.

  One back support 6 is disposed on each of the left and right sides of the pair of back struts 5, and left and right horizontally elongated guide pins 20 are attached to the upper ends of the left and right back supports 6 via upper brackets 55. The upper bracket 55 may be welded to the back support 6 or may be screwed. Further, the guide pin 20 can be attached to the upper bracket 55 by insertion. The right and left back supports 6 are connected at appropriate positions by reinforcing materials.

  As shown in FIG. 11, the guide body 19 includes a resin slider 57 that sandwiches the guide pin 20 from the front and back, a front plate 58 fixed to the back column 5, and a case 59 that fits on the slider 57 from behind. Yes. On the mating surface of the slider 57, a recess 60 for allowing vertical movement relative to the guide pin 20 is formed opposite to each other, and the front plate 58 and the case 59 are provided with protrusions formed on the slider 57. A window hole 61 that fits in is open. The front and rear sliders 57 are fitted to the case 59 so as to overlap each other, and the front plate 58 and the case 59 are screwed to the screws 62 with the protrusions of the slider 57 fitted to the front plate 58 and the case 59. It is concluded with.

  For this reason, the guide body 19 is fitted to the guide pin 20 so as to be slidable up and down, and the back column 5 and the backrest 4 can be rotated relative to the back support 6. It is also possible to provide a female guide body 19 on the back support 6 and a guide pin 20 on the back support 5. Of course, other structure guide means may be employed.

(6) Summary FIG. 12 is a vertical side view in the locked state. As described in the outline, when a seated person leans on the backrest 4, the backrest 4 tilts backward with the second pin 13 as the center, but the second pin 13 moves forward, so the backrest 4 is approximately in the middle. The second part 3a tilts backward while the seat 3 moves forward as a whole (the first part 14a slides horizontally). Accordingly, in this embodiment, the first and second intermediate fittings 11 and 12, the long holes 16 and 17 of the seat receiving portion 2, the outer shell 14, the back column 5, and the back support 6 are the interlocking means described in claim 1. Is configured.

  13A is a schematic view (side view) showing the relationship between the chair of the embodiment and the monitor on the desk, and FIG. 13B is a schematic plan view of the use state. When the seat 3 moves forward during the locking, the satisfaction of the locking can be made as high as possible. In addition, since the upper body of the seated person does not greatly warp, a person can look directly at the monitor M on the desk without waking up against the head H in a rocking state. You can suppress fatigue.

  The backrest 4, the second intermediate metal fitting 12, and the back column 5 can be thought of as an integral structure. Therefore, the backrest 4 is tilted by the guide action of the second long hole 17 and the guide pin 20, but the second Since the elongated hole 17 is in a horizontal posture and the guide body 10 moves in the vertical direction, the backrest 4 is in the same state as rotating (swinging) around the virtual center so that the swing swings, for example. It has become. In the present embodiment, as shown in FIG. 1, the virtual center 64 when the backrest 4 swings (rotates, swings) is positioned near the upper surface of the elbow rest 23.

  The elbow rest 23 moves back and forth, and the virtual center 64 itself moves due to the tilting of the backrest 4, but in any case, the virtual center 64 recedes from the vicinity of the upper surface of the elbow rest 23 at the fully advanced position. It is set so as to be positioned between the upper surface of the elbow rest 23. Further, assuming that the seated person is a person with a general physique, the turning virtual center 64 of the backrest 4 is located near the front surface of the seated person's abdomen (particularly around the navel). Further, with reference to the seat 3, the virtual center 64 is set so that the height from the seating surface is about 20 to 30 cm at the front and rear positions in the vicinity of the front and rear intermediate portion of the seat 3.

  In any case, since the imaginary center 64 of the tilt of the backrest 4 is located above the seat in front of the backrest 4, the upper body of the seated person does not move backward as a whole even if locked. For this reason, even if it is in a locked state, it will hardly leave the top plate D of the desk. As a result, the mouse m and the keyboard K can be easily operated in the locked state.

(7). Second embodiment (FIGS. 14 to 15)
15 to 16 show a second embodiment which is another example of the biasing means and the locking means. 15 is a partially broken front view, FIG. 16A is a cross-sectional view taken along line AA of FIG. 6, and FIG. 15B is a cross-sectional view taken along line BB of FIG. In this embodiment, a support shaft 65 protruding from the outside of the seat 3 is fixed to the side bracket 36, and an inner bush 65 a is fixed to the distal end portion of the support shaft 65 by welding or the like, while the lower end of the elbow post 21 is fixed. The outer bush 66 is rotatably fixed to the inner bush 65a by welding or the like. An end plate 67 is disposed so as to sandwich the outer bush 66, and the end plate 67 is fixed to the inner bush 65a.

  Opening grooves 68 that open toward the end plate 67 are formed at both ends of the outer bush 66 so as to widen in the circumferential direction within a certain range, while the end plate 67 has stoppers 69 that fit into the opening grooves 68. Is formed, and the rotation range θ of the elbow strut 21 is restricted by the inner surface of the open groove 68 coming into contact with the stopper 69. The rotation range of the elbow strut 21 is the same as that of the first embodiment.

  A coiled torsion spring 70 is used as the biasing means, and the torsion spring 70 is fitted into the outer bush 66 from the outside. One end 70 a of the torsion spring 70 is fitted into a hole 71 formed in the elbow post 21, and the other end 70 b of the torsion spring 70 is fitted into a hole 72 formed in one end plate 67. The torsion spring 70 is fitted to the elbow strut 21 and the end plate 68 in a state where an elastic force is stored when the elbow strut 21 is tilted backward. Therefore, the elbow strut 21 is biased forward by the torsion spring 70.

  Further, in this embodiment, as a lock means for holding the elbow strut 21 in a fully tilted state, a notch hole (or groove) 73 extending in the circumferential direction in the outer bush 66 as shown in FIG. The leaf spring 74 is formed so as to cover the notch hole 73, and a radially inward projection 74a is provided on the leaf spring 74, while the inner bush 65 has a stopper projection that is switched by the projection 74a of the leaf spring 74. 75 is provided.

  In this embodiment, the structure is simple and compact because only the torsion spring 70 is used as the biasing means, and the structure of the lock means is simple and compact because only the leaf spring 54 needs to be attached. A spring body such as the leaf spring 74 may be engaged with the angle regulating stopper 69, and in this way, the structure is further simplified.

(8) Third Embodiment (FIG. 16)
In FIG. 16, 3rd Embodiment which is another example of a biasing means and a locking means is shown. (A) and (B) concern on the same example, (A) is sectional drawing of a forward-tilting state, (B) is sectional drawing just before fully tilting backward. In this embodiment, the basic rotation mechanism of the elbow strut 21 is the same as that of the second embodiment, and has an inner bush 65 a and an outer bush 66. However, the inner bush 65a of this embodiment is thickened by resin or die casting.

  The elbow strut 21 is provided with a chevron stopper 76 that protrudes downward as viewed from the axial direction of the support shaft 64 through a guide tube 77 so that it can slide up and down. The chevron stopper 76 is a compression coil spring 78 and an inner bush 65a. It is energized towards. The spring 78 is supported from above by a spring receiver 78. A rod 80 is provided on the spring receiver 79, and the rod 80 is fixed to the elbow post 21. The inner recess 65 has a front recess 81 in which the angle stopper 76 fits perfectly when the elbow support 21 is tilted forward, and a rear recess 82 in which the angle stopper 76 fits tightly when the elbow support 21 is fully tilted backward. Are formed in a continuous state.

  In this embodiment, when the elbow strut 21 is tilted backward, the angle stopper 76 is placed on the rear inclined surface 81a of the front recess 81 in a range from the fully tilted state to the front, so that the elbow strut 21 is returned to the forward tilted posture by the spring 68, and when the elbow post 21 is rotated slightly forward rather than being tilted backward, the chevron stopper 76 moves from the front recess 81 to the rear recess 82, The elbow strut 21 is held in a state where it is fully tilted backward. In this embodiment, the urging means and the locking means are integrated, and the whole is formed inside the elbow strut 21 and the inner bush 65a, so that it is not bulky.

  Shown in (C) is another example. In this other example, the inner column 21b is fixed to the outer bush 66 by welding or the like, and the guide cylinder 21c is disposed inside the inner column 21b, while the guide pin 76a fixed to the angle stopper 76 is slid to the guide cylinder 21c. The elbow strut 21, inner strut 21b, and guide tube 21c are integrally fastened with screws 21d. The chevron stopper 76 is biased toward the inner bush 65 a by a spring 78.

  In the example of (C), since the fitting length between the guide pin 76a and the guide cylinder 21c can be increased, there is an advantage that the chevron stopper 76 can be smoothly slid without being twisted. Even if the guide pin 76a is fixed and the angle stopper 76 is slidably fitted thereto, the same effect can be obtained.

(9) Fourth embodiment (FIG. 17)
The fourth embodiment shown in FIG. 17 is another example of the biasing means and the locking means. (A) is a front sectional view, and (B) is a sectional view taken along line BB of (A). In this embodiment, an outer bush 66 is rotatably fitted to the support shaft 64, and an outwardly recessed triangular first recess is formed on an end surface of the outer bush 66 facing the outer side opposite to the seat receiving portion. 83 and the second recess 84 are formed in a continuous state. The first recess 83 is positioned in front of the second recess 84 when viewed from the backward tilt rotation direction of the elbow strut 21, and the depth of the second recess 84 is shallower than that of the first recess 83. It has become.

  The support shaft 64 protrudes outside the outer bush 66, and a stopper ring 86 having a projection 85 that selectively fits into the recesses 83 and 84 is slidable in the axial direction at the protrusion portion of the support shaft 64. It fits in relative rotation impossible. The stopper ring 86 is urged toward the outer bush 66 by a spring 87, and the spring 87 is held by a cap 88 so that it cannot be removed.

  In the present embodiment, an end plate 89 that prevents the outer bush 46 from moving inward is fixed to the support shaft 44. As a means for sliding the stopper ring 86 onto the support shaft 64, a screw 90 is screwed and fixed to the stopper ring 86. On the support shaft 64, a long groove 91 into which the tip of the screw 70 is slidably fitted is formed. . The long groove 91 does not extend to the end of the support shaft 64, so that the stopper ring 86 slides only a certain distance. Therefore, the outer bush 66 is prevented from coming off by the stopper ring 86. Note that the screw 90 is omitted in (A).

  The fourth embodiment is the same as the third embodiment. When the elbow strut 21 is tilted backward, the stopper ring 86 escapes against the spring 87, so that the elbow strut 21 returns to the forward tilted position. . Moreover, when it is made to tilt backward, the projection 85 of the stopper ring 86 is fitted into the second recess 84, and the rearward tilting posture is maintained. This embodiment is also compact and simple because the biasing means and the locking means are integrated. Further, since the stopper ring 86 and the like are provided at the end of the support shaft 64, assembly and maintenance are easy.

(10). Structure of the fifth embodiment (FIGS. 17 to 24)
18 to 21 show a fifth embodiment. 18A is a longitudinal side view in the non-locking state (neutral state), FIG. 19 is a longitudinal side view in the locking state, FIG. 20 is a sectional view taken along line XX-XX in FIG. 18, and FIG. -XXI sectional view.

  The basic movement of this embodiment is the same as that of the first embodiment, and the mounting structure of the backrest 4 is basically the same as that of the first embodiment. Therefore, a description will be given focusing on differences from the first embodiment.

  In the present embodiment, the first portion 26a and the second portion 26b of the seat inner shell 26 are separated from each other. And as clearly shown in FIG. 18 (B), at the rear end of the first portion 26a, a downwardly hooked center engaging claw 87 is formed at the left and right intermediate portions and both the left and right sides, Engagement pins 89 corresponding to the respective engagement claws 87 are formed at the front end portion of the two portions 26 b, and both portions 26 a and 26 b are rotated relative to each other by fitting the engagement claws 87 and the engagement pins 89. It is linked movably.

  Furthermore, in the present embodiment, the downward foot portions 92 are provided at the left and right intermediate portions of the second portion 26 b of the seat inner shell 26, and the downward foot portions 92 are supported by the first intermediate fitting 12. Accordingly, the second portion 26b of the seat inner shell 26 is deformed so that the portions on the left and right sides of the downward foot portion 92 extend downward due to the seating load. The outer shell 14 is formed with a notch for allowing the downward foot portion 92 to be exposed downward.

  In the present embodiment, the first portion 14a and the second portion 14b of the outer shell 14 are separated. The first portion 26a of the seat inner shell 26 is fixed to the first portion 14a of the outer shell 14, and the second portion 26b of the seat inner shell 26 is fixed to the second portion 14b of the outer shell 14. The same as in the first embodiment.

  As shown in FIG. 20, in this embodiment, a horizontal piece 9b that is laterally outward is integrally provided at the upper end of the side plate 9a of the base 9, and a slide auxiliary body 95 made of resin or the like is fixed to the horizontal piece 9b. On the other hand, the first intermediate fitting 11 has left and right side members 96 and an intermediate plate 97 to which the left and right side members 96 are fixed. The intermediate plate 97 is in contact with the upper surface of the slide auxiliary body 95, while the side member 96 is provided with an inward piece 96 a located on the lower surface of the slide auxiliary body 95. A holding portion that is slidably fitted to the body 95 is formed. Thus, in this embodiment, since the 1st intermediate metal fitting 11 is supported by the base 9 by surface contact, it is excellent in stability and the smoothness of a slide.

  An upper horizontal piece 96b facing left and right is provided at the upper end of the side member 96 constituting the first intermediate fitting 11, and a guide body 98 fixed to the first portion 14b of the outer shell 14 is slidable on the upper horizontal piece 96b. It is fitted in. Since the guide body 98 is made of resin, the outer shell 14 slides smoothly with respect to the first intermediate fitting 11. The guide body 98 can be provided integrally with the first portion 14a of the outer shell 14.

  The second intermediate fitting 12 has a U-shaped cross-section with a left and right side plate 12a and a back plate. The left and right side plates 12 a are connected to the first intermediate fitting 11 by the second pins 13. A spacer (auxiliary plate) 99 is fixed to the upper surface of the second intermediate fitting 12, and the second portion 26b of the seat inner shell 26 is fixed to the spacer 99 with screws (not shown). The downward leg portion 92 of the second portion 26 b of the shell 26 is placed on the front end portion of the spacer 99.

  The base 9 opens forward, and a front plate 100 is disposed at the front end portion thereof from above, and the spring receiver 29 is fixed to the front plate 100. On the other hand, a downward bracket 102 is fixed to the intermediate plate 97 of the first intermediate fitting 12, and the rear spring receiver 30 is fixed to the downward bracket 102. As shown in FIG. 20, the advancing positions of the intermediate fittings 11 and 12 are regulated by the rear spring receiver 30 abutting against the spring receiver 29.

  Since the back strut 5 is fixed to the second intermediate fitting 12, when the backrest 4 moves downward by locking, the second intermediate fitting 12 advances while tilting backward, and the first intermediate fitting 12 pushes the first intermediate fitting 12. The intermediate metal fitting 11 also moves forward. The second part 3b of the seat tilts backward with respect to the first part 3a by locking, but the second part 3b rotates about the pins 89 and 90 of the seat inner shell 26, so that the second part 3b rotates. Further, the occurrence of large elongation on the surface of the seat 3 during backward tilting is suppressed. As a result, the person does not feel discomfort and the durability of the cushion 32 can be improved.

  The second portion 26b of the seat inner shell 26 tilts rearward about the pins 89 and 90. However, since the pins 89 and 90 are located above the bottom surface of the outer shell 14, the seat inner shell 26 is bent. Then, the second portion 14b of the outer shell 14 moves forward relative to the first portion 14a. The first portion 14a and the second portion 14b of the outer shell 14 are separated from each other, so that the first portion 14a and the second portion 14b are allowed to move relative to each other. 26 is allowed to bend (the second portion 26b is tilted backward with respect to the first portion 26a).

(11). Others The present invention can be embodied in various ways other than the above embodiment. For example, the chair may be fixed on the floor. The armrest device may be a system in which the height of the armrest is fixed. Further, the elbow rest does not necessarily have an elongated shape in a plan view. For example, a circular shape in a plan view may be adopted so that the elbow rest can be freely slid within a certain range.

It is an outline schematic side view of the whole chair concerning a 1st embodiment. FIG. 2 is a longitudinal side view. It is the top view which displayed the outer shell by the virtual line. It is a separation top view of an outer shell and a seat inner shell. It is a separation side sectional view of a main member. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 4 in a state where the whole is displayed. It is the VII-VII sectional view taken on the line of Drawing 4 in the state where the whole was displayed. (A) is a VIII-VIII sectional view of FIG. 7, (B) (C) is a figure which shows another example. It is IX-IX sectional view taken on the line of FIG. It is a rear view of a back part. (A) is a longitudinal side view, (B) is a separated sectional view of the waist. It is a vertical side view in a locking state. (A) is a schematic side view which shows a motion of a backrest and a seat, (B) is a schematic plan view in a use condition. It is a partially broken front view of 2nd Embodiment. (A) is AA sectional view taken on the line of FIG. 6, (B) is BB sectional drawing of FIG. It is a figure which shows 3rd Embodiment. It is a figure which shows 4th Embodiment. It is a figure which shows 5th Embodiment, (A) is a vertical side view in a non-locking state, (B) is the isolation | separation sectional drawing which shows the connection structure of a seat inner shell. It is a vertical side view in a locking state. FIG. 19 is a sectional view taken along line XX-XX in FIG. 18. FIG. 19 is a sectional view taken along line XXI-XXI in FIG. 18.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Chair seat 7 Armrest device 9 Base 15 Lower bracket 21 Elbow support 22 Lifting body 23 Elbow rest 24 Absorber 70,73,87 which comprises urging means Spring which comprises urging means

Claims (5)

A seat on which a person sits, a backrest that tilts backward against the spring means when the seated person leans, and an armrest device on which the seated person can work on a desk with his arm on, The device is arranged so that it can rotate back and forth.
Rocking chair with armrests. Below the seat, a seat receiving portion that supports the seat and the backrest is disposed, and the armrest device is disposed on the seat receiving portion in a state in which the rotation fulcrum is located in front of the middle point of the seat. The armrest device is pivotably attached, and the armrest device is configured to rotate in a range of both front and rear sides with the vertical line interposed therebetween. The turning angle is larger,
A rocking chair with an armrest device according to claim 1. The armrest device is biased in a forward rotation direction by a biasing means,
A rocking chair with an armrest device according to claim 1 or 2. In the rocking state where the seated person leans against the backrest, the backrest and the seat are: `` the backrest descends while tilting backward so that the upper end is retracted and the lower end is advanced. '' While the rear part is tilted backwards, it is connected via interlocking means so as to ensure three states of "the distance between the backrest and the rear end of the seat surface is kept constant"
Further, the backrest is set to descend while tilting backward with the vicinity of the upper surface of the armrest device as a virtual center.
The rocking chair with an armrest device according to any one of claims 1 to 3. Furthermore, a lock means for automatically holding the armrest device in a state where it is tilted backward against the biasing means is provided.
A rocking chair with an armrest device according to claim 3 or 4.

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