JP2006333987A - Rocking chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair allowing a user in a sitting state to lightly adjust the degree of resistance to the backward tilting of a backrest. <P>SOLUTION: This chair is provided with a resilient support device 12 supporting the load of the backrest. When the user leans against the backrest, a first operation member 15 retreats, then a second operation member 16 is moved rightward or leftward by the guide operation of a relay member 35 inclined in the planar view and the advance movement of the second operation member 16 is supported by a spring 17. The attitude of the relay member 35 is changed by a cam 41 turnably operated by a lever 19, so that a force applied to the first operation member 15 is changed to change the resistance to the backward tilting of the backrest. The attitude of the relay member 35 is changed by revolving around the axis of a roller 26 so as to change the attitude of the relay member 35 with a light force in a free state where the user does not lean against the backrest. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rocking chair whose backrest tilts backward.

  In a rocking chair, the back tilt of the backrest is supported by a spring, but the resistance to the back tilt of the backrest (the stiffness of the spring) can be changed according to the weight and preference of the user. Many. In this case, there are various methods for adjusting the hardness of the spring. However, when a coil spring is used, generally, a wedge member to which the elastic force of the spring is applied is arranged at the location of the spring receiver, and the grip is rotated. The amount of contraction of the spring is adjusted by operating and moving the wedge member, so that the initial elastic force of the spring is varied.

  However, in this general method, the wedge member moves in the same direction as the direction of expansion and contraction of the spring, and the elastic restoring force of the spring always acts strongly on the wedge member. Since it has to be rotated, it is difficult to adjust the hardness of the spring. In particular, when adjusting the spring so that its hardness (initial elastic force) becomes harder, the resistance increases as the grip is turned, so the adjustment work is particularly troublesome. In the case of a weak user like this, troublesomeness is doubled.

Therefore, in Patent Document 1, a spring support plate for contracting the spring by tilting the backrest is configured to rotate back and forth around the upper end, and between the spring support plate and the spring, By placing a spring seat attached to the end and moving the spring seat up and down with a lever, the span from the center of rotation of the spring seat to the point of load application to the spring is adjusted, so that the spring does not expand or contract It is described that the hardness is adjusted.
Japanese Examined Patent Publication No. 4-74011

  Patent Document 1 uses the principle of lever to change the elastic force of a spring, but since the spring, the spring seat and the support plate are arranged in the front-rear direction, the elastic adjustment mechanism as a whole becomes longer and compact. There was a problem that it was difficult.

  In addition, for example, a synchro-type chair in which the seat tilts backward while interlocking with the back tilt of the backrest is widely used, and in this synchro-type chair, a slide provided on the seat (or an intermediate shaft to which the seat is attached) It is common to provide a locking function by elastically deforming a spring (coil spring) by reversing the shaft, but the one of Patent Document 1 can only be applied to a device having a rotating support plate. It was also a problem that generality (general versatility) was low.

  This invention makes it a subject to improve such a present condition.

  The chair of the present invention includes, as a basic configuration, a seat on which a person sits, a back tiltable backrest on which a seated person can lean, and an elastic support device that provides resistance to the back tilt of the backrest, The support device includes a spring, an operation mechanism that applies a back load to the spring, and an operating body for adjusting the strength of the elastic resistance of the spring against the back load.

  In the first aspect of the present invention, the operating mechanism of the elastic support device moves in a direction intersecting the moving direction of the first operating member, the first operating member moving forward and backward by the addition / release of the backrest load, and the spring. A second actuating member for elastically deforming the first actuating member and a relay member provided on the first actuating member or the second actuating member for converting the longitudinal motion of the first actuating member into the longitudinal motion of the second actuating member, The operation surface of the load on the relay member is inclined together with respect to the moving direction of the first member and the second member, so that the interlocking of both the actuating members is allowed. Adjusting means to change.

  The invention of claim 2 is a preferred embodiment of claim 1 in which a roller for applying a load to the relay member is rotatably attached to the first operating member, The relay member is attached to the second actuating member so as to rotate around the rotation axis of the roller to change its posture, and the adjusting means further includes a cam for changing the posture of the relay member. Yes.

  According to a third aspect of the present invention, in the first or second aspect, the spring, the first operating member, the second operating member, the relay member, and the adjusting means are incorporated into one case to form a unit.

  In the present invention, the pressing force acting on the first operating member via the second operating member can be changed by changing the posture (inclination angle) of the relay member. That is, when the posture of the relay member is changed, the vector of the pressing force of the first operating member acting on the second operating member is changed, thereby changing the load acting on the spring and tilting after the backrest. The resistance to can be adjusted.

  When the relay member is provided on the second actuating member, the first actuating member and the relay member slide relative to each other, and when the relay member is provided on the first actuating member, the second actuating member. The relay member slides relatively with the relay member in contact, but the relay member and the actuating member contact each other in a point contact manner to change the posture of the relay member with a light force in a free state where it does not lean against the backrest. can do.

  In addition, since the first operating member and the second operating member have different moving directions, the members do not line up in the front-rear direction, and the front-rear length can be shortened. For this reason, the elastic support device can be made compact. In addition, as in the embodiment, it is possible to fit the spring into the second operating member, which makes it possible to further reduce the size.

  Further, since the first actuating member that receives the backrest load simply reciprocates, it can be easily attached to a member that reciprocates due to the tilting of the backrest, such as a slide shaft, and is therefore highly versatile.

  If the posture of the relay member is changed by rotating the relay member about the rotation fulcrum of the roller as in claim 2, the resistance when the relay member is rotated is remarkably reduced. There is an advantage that the hardness can be adjusted with a lighter force.

  When the elastic support device is unitized as in claim 3, there is an advantage that handling such as transportation and storage is easy and replacement with an existing chair becomes easy.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a rotary chair for office use or the like, and FIGS. 1 to 8 show the first embodiment.

(1). Outline of First Embodiment First, an outline of the first embodiment will be described with reference to FIG. FIG. 1 is a side sectional view schematically showing a basic configuration of a chair. The chair includes a leg having a leg column 1 made of a gas cylinder, a seat base 2 fixed to the upper end of the leg column 1, and a seat base 2 An intermediate fitting 3 disposed above the intermediate fitting 3, a seat 4 attached to the intermediate fitting 3, a swinging frame 5 attached to the seat receiving base 2 so as to be tiltable rearwardly, and a backrest (not shown) attached to the swinging frame 5. ). The legs have branch legs (not shown) extending radially in plan view.

  The seat receiving base 2 is provided with a bottom plate 2a and left and right side plates 2b and is formed in a box shape (housing shape) opened upward, and the upper end of the leg support 1 is fitted to a cylindrical body 6 provided at the rear portion. Yes. The intermediate metal fitting 3 includes left and right side plates 3a, and the front portions of the left and right side plates 3a are connected to the side plate 2b of the seat receiving base 2 by a first shaft 7 that is long in the left and right directions. The first shaft 7 is a slide shaft. Therefore, a hole formed in the side plate 2b of the seat receiving base 2 so as to penetrate the first shaft 7 is a long hole 8 which is long in the front-rear direction. Reference numeral 9 denotes a bush.

  The swing frame 5 extends rearward on both the left and right sides of the seat receiving base 2, and the front end portion thereof is rotatably connected to the side plate 2 b of the seat receiving base 2 by the second shaft 10. The front and rear halfway part of the swing frame 5 and the rear part of the intermediate metal fitting 3 are connected by a third shaft 11 so as to be relatively rotatable.

  In this embodiment, when the backrest tilts backward, the seat body 4 also moves backward while tilting backward. The backward movement of the first shaft 7 is elastically supported by a spring, and an elastic support device (elastic support unit) 12 for this purpose is arranged inside the seat receiving base 2. In FIG. 1, the elastic support device 12 is simply indicated by a single point difference. In the present embodiment, the first shaft 7 also constitutes a part of the elastic support device 12.

(2) Details of Elastic Support Device Next, the elastic support device 12 will be described with reference to FIG. 2A and 2B are schematic perspective views showing the appearance of the elastic support device 12, FIG. 3 is a separated plan view of the elastic support device 12, and FIG. 4A is a plan view of the elastic support device 12. B) is a sectional view taken along line BB of (A), (C) is a partially broken plan view of (A), and FIGS. 5, 6 and 7 are views taken along line VV and VI-- of FIG. VI sectional view, VII-VII sectional view, FIG. 8A is a plan view showing the action.

  The elastic support device 12 is slidable to the left and right behind the case 14 having an upward opening fixed to the bottom plate 2 a of the seat receiving base 2, a first operating member 15 fixed to the first shaft 7, and the first operating member 15. A second actuating member 16 disposed on the left side, a spring (compression coil spring) 17 fitted to the second actuating member 16 from the left side, and a knob (handle) 18 forming part of the adjusting means.

  The knob 18 can be directly operated by a hand and rotated by a person. As shown by a one-dot chain line in FIG. 2, a lever 19 that can be rotated while a person is seated is provided separately. The nineteen rods 19a may be fixed to the knob 18 so that they cannot be rotated relative to each other and cannot be removed.

  The case 14 is made of a metal plate or resin, and includes left and right side plates 14a and 14b and a rear plate 14c. The left side plate 14 has a hole 21 for holding the spring 17 so as not to be displaced. The spring 17 is supported by a spring receiving plate 22 fixed to the outer surface of the side plate 14 (of course, the left side plate 14a May be supported). In the left and right side plates 14a, 14b of the case 14, there is an elongated hole 23 for allowing the first shaft 7 to move back and forth. Further, as shown in FIG. 6, the case 14 is fixed to the bottom plate 2a of the seat receiving base 2 with a screw 24a via a spacer 24 (of course, it may be solid).

  The first operating member 15 is made of a metal plate and is fixed to the upper surface of the first shaft 7 with screws 25. For this reason, the upper surface of the 1st axis | shaft 7 is notched flat. Further, a rearward projecting portion 15a is formed at a portion of the first actuating member 15 that is closer to the second actuating member 16, and a horizontally rotatable roller 26 is attached to the lower surface of the rear end portion of the rearward projecting portion 15a. Yes.

  The second actuating member 16 is made of, for example, resin or light metal die-cast, and includes two upper and lower block bodies 16a and 16b fastened with screws 28 (of course, an integral structure may be used). A spring receiving hole 29 into which the spring 17 is fitted from the left side is opened laterally at the rear portion of the second operating member 16.

  For example, as shown in FIG. 6, a plurality of guide protrusions 30 project from the lower surface of the second actuating member 16, while the guide protrusions 30 are slidably fitted to the bottom plate of the case 14 in the left-right longitudinal direction. The guide hole 31 is open, and a retaining screw 32 is screwed onto the guide projection 30 from below.

  For this reason, the second actuating member 16 can slide left and right with a certain maximum stroke. As can be understood from FIG. 4A and FIG. 6, for example, a guide roller 33 that is in contact with the rear plate 14c of the case 14 so as to roll freely can be horizontally rotated at the rear end portion of the second operating member 16. It is attached to. For this reason, the 2nd operation member 16 can move right and left smoothly.

  As the first actuating member 15 moves forward, the second actuating member 16 moves to the left against the spring 17. In order to convert the back-and-forth movement of the first operating member 15 into the left-and-right movement of the second operating member 16, a relay member 35 with which the roller 26 of the first operating member 15 contacts is attached to the second operating member 16. . The relay member 35 is provided with a guide surface 35a that is linear in a plan view on which the roller 26 of the second actuating member 16 hits, and the relay member 35 is arranged in such a posture that the guide surface 35a goes to the right as it goes rearward. ing. The second operating member 16 is notched in an inclined shape in plan view to avoid interference with the roller 26 of the first operating member 15.

  The relay member 35 is fitted into a slot 36 formed in the second operating member 16. The relay member 35 is formed with an arcuate guide hole 37 extending around the axis of the roller 26 in the first operating member 15. Two guide screws 37 screwed into the second operating member 16 are formed in the guide hole 37. Screws (guide pins) 38 are penetrated.

  Due to the presence of the two guide pins 38, the relay member 35 rotates horizontally around the axis of the roller 26 in the second actuating member 16, and guide surfaces 35 a with respect to the left and right longitudinal lines 39 (or longitudinal longitudinal lines) in plan view. The inclination angle α (see FIG. 8) can be changed.

  In the present embodiment, the relay member 35 has a planar shape in which two ridges are divided in a plan view, but other planar shapes such as a rectangular shape and a semicircular shape are also possible. In the present embodiment, the operating members 15 and 16 and the relay member 35 constitute an operating mechanism.

  In the second actuating member 16, a slit 40 that opens forward is formed at the rear portion of the relay member 35, and this slit 40 is part of an adjustment means that changes the horizontal posture of the relay member 35. A cam (circumferential cam) 41 is disposed.

  As shown in FIG. 5, the cam 41 is fixed to a rod 42 concentrically attached to the knob 18 by a screw 43 so as not to be relatively rotatable, and a long diameter portion 41 a and a short diameter portion 41 b are viewed from the axial direction of the rod 42. And has a bun egg shape. Therefore, by rotating the rod 42 via the knob 18, the plan view posture of the relay member 35 is changed, and the angle α formed by the guide surface 35 a with respect to the left and right longitudinal lines 39 can be changed.

  In the present embodiment, the knob 18 can be rotated at a certain angle and locked at each rotational position. As an example of the locking means for this purpose, in this embodiment, for example, as shown in FIG. 3, the knob 18 is formed with a protrusion 18a protruding toward the case 14, while as shown in FIG. In the right side plate 14b of the case 14, a plurality of engagement holes 18b into which the protrusions 18a are fitted are formed at appropriate intervals along the circumferential direction. For this reason, when the knob 18 is pulled outward, the protrusion 18a is detached from the engagement hole 18b, whereby the knob 18 can be rotated.

  The rod 42 is slidably fitted to the knob 18 so as not to rotate relative to the knob 18, for example, by making the fitting portion with the knob 18 a non-circular shape having a square cross section. Therefore, the rod 42 and the cam 41 are allowed to move left and right together with the second operating member 16.

  Although the detailed structure is omitted, the knob 18 is attached to the rod 42 so as not to be detached, and is urged to be in close contact with the case 14 by a built-in spring. Therefore, when the lever 19 is pulled outward along the axial direction, the lock by the fitting of the knob 18, the projection 18a and the engagement hole 18b is released, and the rotation is allowed. In the present embodiment, the knob 18, the cam 41, and the relay member 35 constitute an adjusting means.

(3) Summary Next, the operation will be described mainly with reference to FIG. In a free state where the person is not leaning against the backrest, the second actuating member 16 is pushed by the spring 17 and is pushed toward the right side plate 14 b of the case 14. In the case of the synchro-type chair as in the present embodiment, the first shaft 7 moves backward when the person is seated, so that a slight external force acts on the spring 17 even in the free state. It is compressed to some extent even in the free state. That is, an initial elastic force is applied to the spring 17.

  When a person leans against the backrest and a backrest load is generated, the relay member 35 is pushed by the roller 26 of the first operation member 15, so that the second operation member 16 moves to the left against the spring 17. This gives the chair rocking properties.

  In this case, since the guide surface 35a of the relay member 35 is inclined in plan view, as shown in the vector diagram of FIG. 8B, when the external force acting on the second operating member 16 is F1, The pressing force F2 is F1cos α. Therefore, although the pressing force on the second actuating member 16 varies depending on the weight of the seated person, the user can change the angle of the relay member 35 with the lever 19 so that the optimum resistance (hardness) to the back tilt of the backrest can be obtained. ) Can be obtained.

  Further, as described below, when the inclination angle α of the relay member 35 becomes smaller, the second actuating member 16 becomes difficult to move, the backrest becomes difficult to tilt backward (the spring becomes hard), and when the inclination angle α of the relay member 35 becomes smaller. The second actuating member 16 becomes easy to move, and the backrest tends to tilt backward (the spring becomes soft).

  In other words, the maximum moving stroke L1 of the first actuating member 15 is always constant, but the moving stroke L2 of the second actuating member 16 changes when the angle α of the relay member 35 is changed. By changing the movement stroke L2 of the member 16, the resistance against the backward inclination of the backrest is changed.

  Even in the free state, the elastic force of the spring 17 acts on the roller 26 of the first actuating member 15 via the relay member 35. However, the relay member 35 and the roller 26 abut in a point contact state in plan view. And the relay member 35 revolves about the axis of the roller 26, so that there is almost no resistance when the relay member 35 revolves in the free state. Can be changed. Therefore, even a powerless woman or child can operate the lever 19 lightly while sitting.

  Further, in the conventional general chair, the initial elastic force of the spring is changed by rotating the handle and grip many times, which is troublesome and difficult to adjust the sitting state. Since the lever 19 only needs to be rotated by a slight angle, the lever 19 can be adjusted in a one-touch manner while seated.

  When the relay member 35 is turned horizontally, the contact point between the relay member 35 and the roller 26 is shifted in the circumferential direction of the roller 26 and the second actuating member 16 can move slightly left and right. The force can be changed slightly. Although the movement directions of the two operating members 15 and 16 are orthogonal, it is not always necessary to orthogonally.

(4). Second embodiment (FIG. 9)
FIG. 9 shows a second embodiment. This embodiment is a modification of the first embodiment, and a bearing 43 that supports the pressing force of the first shaft (slide shaft) 7 is provided on the first operating member 15. In this embodiment, the bearing 43 is fixed to the second actuating member 16 with a screw 46. However, the bearing 43 can be integrally formed with the first actuating member 15 by using, for example, a die-cast product or a resin product.

  When the load from the first shaft 7 is received by the bearing 43 as in the present embodiment, the first shaft of the existing chair can be used as it is without changing the design, and therefore versatility becomes higher.

(5). Third embodiment (FIGS. 10 to 12)
10 to 12 show a third embodiment. 10 is a plan view, FIG. 11 is a sectional view taken along line XI-XI in FIG. 10, and FIG. 12 is a sectional view taken along line XII-XII in FIG.

  The basic configuration of the third embodiment is almost the same as that of the first embodiment. As a difference from the first embodiment, first, a left / right slide mechanism of the second operating member 16 is cited. That is, in the present embodiment, as shown in FIG. 11, the rear portion of the second operating member 16 is held unmovably by a flange 14 d formed on the rear surface plate 14 c of the case 14, while the rear portion of the second operating member 16 A stepped portion 47 is formed, and the stepped portion 47 is slidably held by a front guide body 48 fixed to the case 14 so that it cannot be pulled upward.

  If such a slide support mechanism is adopted, the number of members can be reduced, so that the cost can be suppressed, and the protrusion from the lower surface of the case 14 can be eliminated, so that the seat support base 2 can be fixed and positioned. It becomes easy. For this reason, the merit of unitizing the elastic support mechanism becomes higher. It should be noted that a slider or a lubricant for facilitating the sliding may be interposed at a contact portion between the second operating member 16 and the case 14 and the guide body 48.

  The form of the cam 41 is mentioned as the next difference with 1st Embodiment. That is, in this embodiment, the cam 41 is formed with a protruding portion 41a extending in the axial direction of the rod 42, and the cam groove 49 into which the rear end portion of the guide member 43 is fitted on the end surface of the protruding portion 41a The depth is changed along the direction. Needless to say, the protrusion 41a is set to a size that does not interfere with the second actuating member 16 even if it rotates.

  When the cam 41 is formed as in the present embodiment, the cam 41 and the relay member 35 are engaged with each other, so that the angle of the relay member 35 can be adjusted more accurately.

  A feature of the present embodiment is that the roller 26 of the first operating member 15 (in other words, the load application point of the first operating member 15 with respect to the relay member 35) is located in the left and right intermediate portion of the case 14. For this reason, there is an advantage that the slide of the first shaft 7 is smooth.

  When the cam is used as the adjusting means as in the above embodiments, the cam is rotated around the axial center extending in the front-rear direction, and the front surface of the cam is used as the cam surface. It is also possible to support it. In this case, since the pressing force of the relay member 35 does not act as a force for rotating (rotating) the cam, there is an advantage that the posture holding function of the guide member is improved.

(6). Fourth embodiment (FIGS. 13 to 21)
13 to 21 show a fourth embodiment. 13 is a side view, FIG. 14 is a separated side view, FIG. 15 is a plan view taken along line XV-XV in FIG. 13, FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. 18A is a cross-sectional view taken along the line XVIII-XVIII of FIG. 15, FIG. 18B is a cross-sectional view taken along the line BB of FIG. 19A, and FIG. 19 is a cross-sectional view taken along the line XIX-XIX of FIG. 20 is a cross-sectional view taken along the line XX-XX in FIG. 17, and FIG. 21 is a side view in a locked state.

  The present embodiment is characterized in that the elastic support device 12 is attached to the left and right swing frames 5, and the structure of the elastic support device 12 is the same as that of the third embodiment, and has the same structure as that of the third embodiment. The support device 12 is arranged upside down (therefore, the left and right displays are reversed from the third embodiment). Since the structure of the elastic support device 12 is the same as that of the third embodiment, the description thereof is omitted.

  In the present embodiment, the left and right swing frames 5 are plate-like and extend in the front-rear direction on both the left and right sides of the seating base 2, and are provided with standing portions 5a at the rear. The left and right upright portions 5a are fixed to each other with a U-shaped connecting portion 50 facing downward in a front view by screws, and a pipe back column 51 is fixed to the connecting member 50 by welding. A backrest 52 is attached to the back column 51.

  A bush may be fixed to the connecting member 50, and the back column 51 may be inserted and attached to the bush. As shown in FIGS. 13 and 19, the front and rear middle portions of the left and right swing frames 5 are connected by a reinforcing member 53 that overlaps the upper surface thereof.

  While the lateral width of the case 14 in the elastic support device 12 is set to be approximately the same as the lateral width of the seat support base 2, for example, as shown in FIG. A link member 55 is attached between the front portion of the elastic support device 12 and the left and right swing frame 5 so as to apply a backrest load to the elastic support device 12.

  In the present embodiment, as a method of fixing the elastic support device 12 to the left and right swing frame 5, as shown in FIG. 19A, a downward opening U-shape is formed on the lower surface of the case 14 (upper surface in the state of the third embodiment). On the other hand, a downward lip 57 that overlaps the receiving member 56 may be bent and formed on the left and right swing frame 5 and fastened with screws 58, or as shown in FIG. As shown, a stepped lip 14 a ′ may be formed on the side plates 14 a and 14 b of the case 14, and this and the swing frame 5 may be fastened with screws 58.

  The link member 55 is formed in a substantially fan shape (or a shape like a ginkgo leaf) in a side view (in other words, formed in the shape of a kind of bell crank lever), and the link member 55 is formed of the elastic support device 12. Is fitted to the left and right longitudinal central shaft 59 fixed to the lower end of the case 14 by welding or the like.

  On the other hand, a left and right long fixed shaft 60 positioned on the front side of the central shaft 59 is fixed to the rear end portion of the seat receiving base 2 via a bracket 61, and a first slit groove 62 formed in the link member 55. Is slidably fitted on the fixed support shaft 60. Further, the link member 55 is formed with a second slit groove 64 into which the operating shaft 63 to which the first operating member 15 is attached is slidably fitted.

  The operating shaft 63 is positioned in the front-rear position between the central shaft 59 and the fixed shaft 60 and above the central shaft 59 and the fixed shaft 60. Further, the two slit grooves 62 and 64 extend radially from the central shaft 59. In addition, it is also possible to adopt a long hole instead of the slit grooves 62 and 64.

  In the present embodiment, as shown in FIG. 21, when the backrest tilts backward, the link member 55 rotates around the second shaft 10 together with the swing frame 5. Then, due to the presence of the fixed shaft 60, the link member 55 rotates clockwise around the central shaft 59 as viewed from the right side, and then the operating shaft 63 moves forward against the spring 17. That is, the backward tilting of the backrest 52 is converted into the forward movement of the operating shaft 63 via the link member 55. The hardness of the spring 17 can be adjusted as in the third embodiment.

  Since the elastic support device 12 of the present invention can be made compact as a whole, it can be easily incorporated into the swing frame 5 as in this embodiment. Note that the entire swing frame 5 can be a resin molded product or a die-cast product, and can be designed according to a request for design, strength, and the like. Further, the means for transmitting the backrest load to the first actuating member 15 is not limited to the use of the link member 55, and other conversion means may be employed.

(7). Others The present invention can be embodied in various ways other than the above embodiment. For example, the form and material of each member can be set freely. Further, the adjusting means for changing the posture of the relay member is not limited to using the cam of the embodiment, and for example, the position of the guide member can be adjusted using a screw shaft.

It is a sectional side view which shows the outline | summary of a chair. It is a schematic perspective view which shows the external appearance of an elastic support apparatus. It is a separation top view of an elastic support device. (A) is a plan view of the elastic support device, and (B) and (C) are a sectional view and a partial plan view of (A). FIG. 5 is a cross-sectional view taken along the line V-V in FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is a plan view showing the operation. It is a figure which shows 2nd Embodiment. It is a top view of a 3rd embodiment. It is XI-XI sectional view taken on the line of FIG. It is XII-XII sectional view taken on the line of FIG. It is a side view of 4th Embodiment. FIG. It is a XV-XV view top view of FIG. FIG. 14 is a sectional view taken along line XVI-XVI in FIG. 13. It is the XVII-XVII sectional view taken on the line of FIG. (A) is a sectional view taken along line XVIII-XVIII of FIG. 15, and (B) is a sectional view taken along line BB of (A). It is the XIX-XIX sectional view taken on the line of FIG. FIG. 18 is a sectional view taken along the line XX-XX in FIG. 17. It is a side view in a locking state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Seat receiving base 3 Intermediate | middle metal fitting 4 Seat body 5 Oscillation frame 7 1st axis | shaft 12 Elastic support device 14 Case 15 2nd operation member 16 1st operation member 17 Spring 18 Knob 26 Roller 35 Relay member 35a Guide surface

Claims (3)

A seat on which a person sits, a backrest that can be tilted back on which a seated person can lean, and an elastic support device that provides resistance to tilting after the backrest. A rocking chair comprising an operating mechanism that acts on a spring, and an operating body for adjusting the strength of the elastic resistance of the spring against a backrest load,
The operating mechanism of the elastic support device includes a first operating member that moves forward and backward by addition / release of a backrest load, a second operating member that moves in a direction crossing the moving direction of the first operating member and elastically deforms the spring. And a relay member provided on the first actuating member or the second actuating member for converting the longitudinal motion of the first actuating member into the longitudinal motion of the second actuating member, and a load acting surface on the relay member. Interlocking of the two actuating members is allowed by inclining both with respect to the moving direction of the first member and the second member, and further provided with adjusting means for changing the posture of the relay member by operation of the actuating body.
Rocking chair. A roller for applying a load to the relay member is rotatably attached to the first actuating member, while the relay member is arranged around the rotation axis of the roller on the second actuating member. It is attached to rotate and change its posture, and the adjusting means further includes a cam for changing the posture of the relay member.
The rocking chair according to claim 1. The spring, the first actuating member, the second actuating member, the relay member, and the adjusting means are incorporated into one case to form a unit.
The rocking chair according to claim 1 or 2.

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