JP5852348B2 - Rocking chair - Google Patents

Description

  The present invention relates to a rocking chair.

  In a rocking chair in which the backrest tilts backward against the spring means, a control device (locking device) for switching the backrest to a non-tiltable state or a tiltable state, or to hold the backrest in a tilted posture. It is widely used, and a back gas cylinder is used as a control device (for example, Patent Document 1). When a gas cylinder is used as a tilt control device for the backrest, there is an advantage that the backrest can be held at an arbitrary rearward tilt angle.

Utility Model Registration No. 2555498

The gas cylinder has a structure in which the rod protrudes from the cylinder, and the base end of the cylinder is connected to the mating member with a pin, while the male thread is provided at the tip of the rod . The male screw portion can be fastened to the fastening partner member with a nut. Further, from the tip of the rod, the push valve for releasing the lock projects.

The gas cylinder exhibits its function by fixing one of the cylinder and the rod and sliding the other in the axial direction. It is up to the designer to decide which side of the cylinder or rod should be fixed, but in the case of a back gas cylinder, the rod is fixed because it facilitates the installation of the push valve operating member. Thus, it can be said that the cylinder is often configured to slide. Since the back gas cylinder entirely rotated by the locking rod, rather than non-rotatably fixed to say that fixed, it is connected to the rotatable state.

And, conventionally when mounting the spine gas cylinder, while the rod is being Dari screwed into the female thread portion or fastened with a nut to the other member, the tubular body, by inserting the pin from the set in a predetermined position, further There is a problem that it takes time to mount the back gas cylinder because it is provided with retaining means such as a snap ring.

  The present invention has been made in view of such a current situation, and is intended to realize a very simple attachment of the back gas cylinder of the chair.

The present invention includes the structures of the claims. Of these, the invention of claim 1
A seat, a back tiltable backrest, and a back gas cylinder for controlling the tilting of the backrest;
One end of the back gas cylinder is provided with a fixed fitting portion that fits into a fixed receiving portion provided on a fixed support member that does not move even when the backrest tilts backward, and the other end of the back gas cylinder has A movable fitting portion that is fitted to a movable receiving portion provided on a movable member that moves in conjunction with the tilting of the backrest is provided ,
The pair of the fixed receiving portion and the fixed fitting portion, and the pair of the movable receiving portion and the movable fitting portion are configured such that when the back gas cylinder is in a posture different from the use state , one fitting portion is one In the basic configuration in which the other fitting portion is set to be fitted into the other receiving portion when the back gas cylinder is turned to the use posture, and then the other receiving portion is set. The portion is provided on a seat receiving member that supports the seat, and a stopper that prevents the other fitting portion from coming out of the other receiving portion is attached to the seat receiving member.

According to a second aspect of the present invention, in the same basic structure as in the first aspect, a plug-in type stopper is further provided to prevent the other fitting portion from coming out of the other receiving portion, and the stopper is elastically deformed. It is held so as not to come off by the engaging means.

  According to a third aspect of the present invention, in the first or second aspect, the base is provided on the upper end of the leg, the backrest is provided on a back frame that is connected to the base so as to be tiltable rearwardly, and on the base. The seat receiving member for supporting the seat is arranged to tilt backward or retract in conjunction with the backward tilting of the backrest, while the back gas cylinder extends in the front-rear direction. Disposed on the lower side of the member, provided with the fixed fitting portion at the rear end of the back gas cylinder and provided with the movable fitting portion at the front end, and on the seat receiving member, In the state where the seat receiving member is connected to the base and the back frame, a punched hole with an upper and lower opening is formed to enable the back gas cylinder to be attached. In addition, in claim 3, the seat “reversely tilts or retracts in conjunction with the rearward tilt of the backrest” refers to the three cases of the case of only the rearward tilt, the case of only the rearward tilt, and the case of the rearward tilt and the rearward. Contains.

  In the present invention, the back gas cylinder is assembled in a stretchable state by changing one end portion of the back gas cylinder to a use posture after setting it in a posture different from the use state. Therefore, troublesome operations such as screwing of nuts and inserting pins can be omitted, and as a result, the efficiency of assembling the chair can be improved.

  The back gas cylinder needs to be held in a predetermined state of use, and this holding means can take various configurations, but if a plug-in type stopper is used as in claim 2, the attachment can be performed with one touch, This can further contribute to improving the assembly of the chair.

  In a synchro-type chair in which the seat tilts backwards or retracts in conjunction with the backrest, placing the back gas cylinder below the seat receiving member has the advantage of improving the appearance, but the back gas cylinder is used as the seat receiving member. As a result, it is difficult to assemble the chair. That is, one end of the back gas cylinder is first connected to the base, and then the other end of the back gas cylinder is connected with the seat receiving member raised, and then the seat receiving member is returned to the predetermined position. The procedure of connecting to a back frame or the like must be taken, which makes the assembly work of the chair troublesome.

  On the other hand, in the invention of claim 3 of the present application, since the back gas cylinder can be attached in a state where the seat receiving member is set, the assembly work of the chair can be performed more efficiently.

(A) is the side view of the chair which concerns on 1st Embodiment, (B) is the perspective view which abbreviate | omitted the seat part. It is a separation perspective view of the whole chair. It is a separation perspective view of the whole chair. (A) is the perspective view which looked at the support mechanism part from the front lower part, (B) is the perspective view which looked at the support mechanism part from the horizontal lower part. It is a separation perspective view of a support mechanism part. (A) is the isolation | separation perspective view in the state which turned the seat part upside down, (B) is the isolation | separation perspective view of a seat outer shell and an intermediate | middle metal fitting, (C) is a partial expansion perspective view of a seat outer shell. It is a top view of the support mechanism part centering on the base. (A) is a partially separated perspective view of the support mechanism part centering on the base, (B) is a sectional view taken along the line VIIIA-VIIIA in FIG. 7, and (C) is a sectional view taken along the line VIIIC-VIIIC in FIG. (A) is a vertical side view of the support mechanism, and (B) is a separated perspective view of the push shaft and the spring contact. It is a vertical side view of a back frame. (A) is sectional drawing for description seen by the XI-XI view of FIG. 7, (B) (C) is the elements on larger scale of (A). (A) is a separated perspective view of the elasticity adjusting unit and the base, and (B) is a partially separated perspective view of the elasticity adjusting member. (A) is a separated perspective view of an elastic adjustment member, (B) is a separated perspective view of a spring case, and (C) is a perspective view of a spring unit. It is a separation perspective view of an elastic adjustment member. (A) is a separated perspective view of an intermediate | middle metal fitting and a locking device, (B) is a separated perspective view of a support mechanism part. (A) is a lower perspective view showing a mounting state of the locking device, (B) is a perspective view of the locking device, and (C) is a partially broken perspective view showing a retaining structure of the locking device. (A) (B) is a separation perspective view of the elasticity adjustment unit concerning a 2nd embodiment. The perspective view of the elasticity adjustment unit which concerns on 2nd Embodiment, (B) is the isolation | separation side view which shows the relationship between an elasticity adjustment member and a base.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the words “front and rear” and “left and right” are used to specify the direction, but the words on the front and rear and right and left are based on the person who is seated. The front view direction is the direction facing the seated person, and therefore the left and right in the front view are opposite to the left and right viewed from the seated person.

(1). Outline of Chair First, an outline of a chair will be described mainly with reference to FIGS. This embodiment is applied to a swivel chair often used for office work etc., as shown in FIG. 1, the chair is fixed to the leg device displaying only the leg column 1 and the upper end of the leg column 1. The base 2, the seat 3 disposed on the base 2, and the backrest 4 on which the person who is seated can lean against. For example, as shown in FIG. 2, an intermediate metal fitting (seat receiving metal fitting) 5 made of a metal plate is arranged on the base 2, and a resin seat outer shell 6 is attached to the intermediate metal fitting 5. The intermediate | middle metal fitting 5 is an example of the seat receiving member described in the claim . It is also possible to connect the seat outer shell 6 to the base 2 without using the intermediate metal fitting 5 (in this case, the seat outer shell 6 can also be viewed as a seat receiving member).

Seat 3 includes a seat inner shell (seat plate) 7 made of resin, has a seat cushion member 8 arranged superimposed on the upper surface, the seat cushion member 8 is covered from above by the skin material such as a cross Yes. In the present embodiment, the seat outer shell 6 is composed of a fixed outer shell 9 fixed to the intermediate metal fitting 5 and a slide outer shell 10 protruding in front thereof, and the slide outer shell 10 is connected to the fixed outer shell 9. It is attached slidable back and forth.

Further, a certain range on the front side of the seat inner shell 7 is a deformation allowing portion 7a that easily bends and deforms downward in a side view, and the front end portion of the deformation allowing portion 7a is the front end portion of the slide outer shell 10. It is connected. For this reason, when the slide outer shell 10 is slid back and forth, the deformation allowing portion 7a of the seat inner shell 7 extends forward or is wound downward. Thereby, the front-rear length of the seat 3 can be adjusted. Note that the seat outer shell 6 can be viewed as a part of the seat, and it can also be considered that the seat is constituted by the seat 3 and the seat outer shell 6. A large number of horizontally elongated slits are formed in the deformation allowing portion 7a.

As shown in FIG. 2, the backrest 4 has a resin-made back inner shell (back plate) 12 and a cushion material 13 disposed on the front surface thereof, and the cushion material 13 and the back inner shell 12 are bags. It is completely covered with a skin material. The backrest 4 forms a lumbar support that hits the lumbar spine of the person who is seated. In other words, the backrest 4 has a shape in which the longitudinal side view is curved in a forwardly convex shape so that the portion that contacts the lumbar vertebra of the seated person is the foremost. Needless to say, the form and structure of the backrest 4 and the seat 3 can be arbitrarily selected.

For example, as shown in FIG. 2 , the first back frame 14 is connected to the base 2 so as to be tiltable rearward . The first back frame 14, the second back frame 15 located behind is fixed, the backrest 4 is mounted to the second back frame 15. The first back frame 14 is made of resin or aluminum die-cast, and as shown in FIGS. 3 and 5, a base portion 14 a that extends in the left-right direction behind the base 2, and the outer side of the base 2 from the left and right sides of the base portion 14 a The arm portion 14b extends forward at a position, and the front end portions of the left and right arm portions 14b are connected to the base 2 by a horizontally elongated first shaft 16. Accordingly, the backrest 4 is tilted about the axis of the first shaft 16. The base 2 has a bearing hole 17 into which the first shaft 16 is fitted.

The front portion of the left and right arm portions 14b in the first back frame 14 is a crank portion 14c that enters the left and right inner sides, and the first shaft 16 penetrates the base end portion of the crank portion 14c. Further, the front ends of the left and right crank portions 14c are integrally connected by a laterally long push shaft 18. The push shaft 18 is covered with a lower cover 19 from below. In the left and right side plates of the lower cover 19, elongated holes 20 that allow the push shaft 18 to rotate are opened upward.

The second back frame 15 is fixed to the first back frame 14 with screws 21 (see FIG. 10). Second back frame 15 is made of resin or aluminum die-cast, in its rear end, rectangular right and left two posts 15a are upwardly protruded. The backrest 4 is connected to the support column 15a so as to be able to rotate back and forth around the height position of the lumbar support portion, and the rotation posture can be changed in a plurality of stages by an initial angle adjusting mechanism (not shown).

  As described above, the first back frame 14 tilts backward about the first shaft 16. Therefore, the elasticity adjusting unit 23 is provided inside the base 2 to provide resistance to the rearward tilting of the first back frame 14.

  The chair of the present embodiment is a synchro-type chair in which the seat 3 is retracted in conjunction with the backward tilting of the backrest 4, and the front part of the intermediate bracket 5 is elastic as can be estimated from FIG. The rear portion of the intermediate fitting 5 is connected to a bracket portion 24 projecting upward from the first back frame 14 by a horizontally elongated second shaft 25. Further, in the present embodiment, a longitudinal gas cylinder 26 for the longitudinal direction is disposed on the elasticity adjusting unit 23 as a locking device for locking the backrest 4 at an arbitrary rearward tilt angle.

(2) Base / seat outer shell Details of each part will be described below with reference to FIG. 6 and subsequent drawings in addition to the previous drawings. First, the relationship between the base 2 and this and the seat outer shell 6 will be described. For example, as shown in FIGS. 3 and 5, the base 2 has a box shape that opens upward, and the depth becomes shallower toward the front. An outward flange 29 is formed on the upper end edge of the base 2 over the entire circumference.

For example, as can be understood from FIG. 3, the bottom of the rear half of the base 2 is raised and raised, and a groove-type base bracket 30 having a bottom plate and left and right side plates 30a is welded to the raised portion. It is fixed. Bottom plate and the bush 31 of the bottom plate and the top and bottom opening of the base 2 of the base bracket 30 is welded to the bushing 31, the upper end of the leg support post (gas cylinder) 1 is fitted from below. The base bracket 30 is an example of a fixed support member described in the claims, and a left and right laterally long third shaft 32 penetrates the left and right side plates 30a as an example of the fixed fitting portion described in the claims. , the third axis 32, back gas cylinder 26 is forward immovably supported. The third shaft 32 is attached to the left and right side plates 30 a of the base bracket 30.

  For example, as shown in FIG. 3, the intermediate metal fitting 5 has a shape that is substantially close to a square in plan view, and has an upper plate 5a and left and right side plates 5b. The second shaft 25 penetrates the side plate 5b. As shown in FIG. 2, the side plate 5 b of the intermediate fitting 5 is located inside the bracket portion 24 in the first back frame 14.

  As shown in FIG. 6, the fixed outer shell 9 is formed with a recess 33 that fits completely into the intermediate metal fitting 5. A pair of left and right forward stoppers 34 is provided at the front end of the upper surface of the intermediate metal fitting 5, while a tunnel-shaped receiving portion 35 into which the forward stopper 34 is fitted from behind is provided at the front end portion of the recess 33 in the fixed outer shell 9. Are integrally formed.

Further, a left and right horizontally long and rectangular lock hole 36 is formed in the rear end portion of the upper plate 5 a in the intermediate metal 5, while a lock that fits in the lock hole 36 in the rear end portion of the recess 33 in the fixed outer shell 9. The claw 37 is protruded downward. The lock claw 37 is fitted into the lock hole 36 from the elastically deformed. Thereby, the fixed outer shell 9 is attached to the intermediate metal fitting 5 so as not to be detached.

For example, as shown in FIG. 5, the elasticity adjusting unit 23 has a pair of left and right support brackets 38 that fit into the front portion of the base 2. The support bracket 38 is made of a plate material and is disposed on the inner side of the inner surface of the base 2, and at the front portion of the support bracket 38, a blade portion 39 that overlaps the outward flange 29 of the base 2 from above is provided to project sideways. ing. The outward flange 29 of the base 2, and projecting portions 29a overlapping the vane portion 39 is formed in the support bracket 38, the protruding portion 29a, the stopper piece 40 upward collision to hold the vane portion 39 so as not to left shift It is installed.

A resin-made slider receiver 41 is fitted to the protruding portion 29a of the base 2 and the blade portion 39 of the support bracket 38 from the left and right outer sides, and as shown in FIG. and the projecting portion 29a, and is fastened with screws 42. For example, as shown in FIG. 3, the intermediate fitting 5 is provided with a laterally projecting portion 43 that overlaps the slider receiver 41 from above, and as shown in FIG. 8C, the outer end portion of the laterally projecting portion 43. A resin slider 44 mounted on the lower surface of the slider abuts against the slider receiver 41 from above.

  The upper surface of the outer end portion 41a that supports the slider 44 of the slider receiver 41 has a curved shape that is convex upward in a side view. For this reason, the intermediate metal fitting 5 (the seat 3) moves smoothly during the locking and moves backward while tilting. As shown in FIG. 4 (A), a wall portion 43a that surrounds the slider receiver 41 from the left and right sides and from behind is projected downward from the laterally projecting portion 43 of the intermediate fitting 5.

On the other hand, the upper portion of the outer end portion 41 a of the slider receiver 41 is a protruding portion that protrudes to the left and right sides, and a stopper piece 45 positioned below the protruding portion of the slider receiver 41 is formed on the wall portion 43 a of the intermediate bracket 5. (See also FIG. 16A). Therefore, the front part of the intermediate metal fitting 5 is held so as not to be able to move upward. Therefore, even if the front part of the seat 3 is lifted up, the intermediate metal fitting 5 does not come off the base 2. In addition, the separation preventing function between the intermediate bracket 5 and the base 2 is also provided by other members.

(3). Elasticity adjustment mechanism Next, an elasticity adjustment mechanism centering on the elasticity adjustment unit 23 which is the core of the present invention will be described. For example, as shown in FIG. 5, the elasticity adjusting unit 23 can be freely mounted on the left and right pair of support brackets 38, the spring unit 50 disposed between the left and right support brackets 38, and the left and right support brackets 38. The attached operating shaft 51 and a substantially L-shaped posture holding body 52 mounted on the left and right sides of the spring unit 50 are provided.

As shown in FIG. 13, the spring unit 50 includes a bottomed cylindrical fixed spring receiver 53 that is substantially square and opened rearward, a compression coil spring 54 that is disposed inside the fixed spring receiver and exposed rearward, The movable spring receiver 55 is slidably fitted to the spring receiver . And forms a variable dynamic spring receiving 55 generally prismatic form, Therefore, it has a shape close to the internal be generally rectangular receiving fixing spring. In addition, guide protrusions 56 are provided on the left and right side surfaces of the movable spring receiver 55, while guide grooves 57 into which the guide protrusions 56 are fitted are formed on the inner surface of the fixed spring receiver.

The fixed spring receiver and the movable spring receiver 55 are penetrated by laterally long pins 58 as an example of connecting means, and the movable spring receiver 55 is formed by making the pin insertion hole 59 of the fixed spring receiver a long hole in the front and rear direction. Slide back and forth is allowed. A support shaft 60 projecting left and right is provided at the front end of the fixed spring receiver , and the support shaft 60 is fitted into a hole 61 provided in the support bracket 38 via a bush. Since the support bracket 38 is fixed to the base 2, the spring unit 50 rotates up and down around the support shaft 60.

For example, as shown in FIGS. 9 and 13, a pusher 62 is attached to the push shaft 18 provided at the front end of the first back frame 14, and the movable spring receiver 55 is pushed by the pusher 62. The rear end portion of the movable spring receiver 55 has a mountain shape that protrudes backward in a side view, while the front surface of the pusher 62 is an arc surface 62a having a radius of curvature centering on the support shaft 60 in a side view. As can be easily understood from FIG. 9B, a positioning member 63 having a front plate 63 a, a bottom plate 63 b, and left and right side plates 63 c is fixed to the push shaft 18, and a positioning member 63 is attached to the pusher 62. A recess 64 that fits from above is formed, so that the pusher 62 is held so that it cannot be displaced left and right and cannot rotate. A longitudinal groove is formed on the front surface of the pusher 62.

An engagement hole 65 is provided in the bottom plate 63 b of the positioning member 63, while an engagement claw 66 that fits into the engagement hole 65 is formed in the pusher 62, and the engagement claw 66 is formed in the engagement hole 65. By being caught, the positioning member 63 is held so as not to be detached from the push shaft 18. On the rear surface of the pusher 62, a groove 62b opened rearward is formed over the entire length of the left and right. The positioning member 63 may be integrally formed with the push shaft 18.

For example, as shown in FIG. 14, a pair of left and right guide shafts 67 project from the left and right outwards in a portion of the fixed spring receiver behind the support shaft 60, while the guide shaft 67 is provided on the support bracket 38. movably fits to form an arcuate guide hole 68. Thereby, the rotation stroke of the spring unit 50 is regulated.

  For example, as can be understood from FIG. 13, a pair of left and right peripheral cams 70 are fitted on the operation shaft 51, while the left and right side surfaces of the fixed spring receiver constituting the spring unit 50 are arranged on the outer periphery of the peripheral cam 70. A cam receiving portion 71 with which the surface hits is projected. As clearly shown in FIG. 11, in the present embodiment, the circumferential cam 70 is formed with first to fifth cam surfaces 70 a to 70 e in order of decreasing distances e1 to e5 from the rotation axis. For this reason, when the circumferential cam 70 is rotated by the operation shaft 51, the spring unit 50 can be changed into five postures. That is, the magnitude of resistance to rocking can be adjusted in five stages.

Left and right circumferential face cam 70 is integrally molded on one of the cam member 73 by connecting via the cylindrical portion, by inserting the square of the operating shaft 51 to the cam member 73, and the circumferential operation shaft 51 The surface cam 70 rotates integrally. For example, as shown in FIGS. 12 and 14, the operation shaft 51 is rotatably held by the left and right support brackets 38. Further, one end portion of the operation shaft 51 protrudes to the outside of the base 2, and a knob 74 is attached thereto. A retaining clip 75 is attached to the other end of the operation shaft 51. For example, as shown in FIG. 12A, the base 2 is provided with a recess 76 into which the operation shaft 51 enters. For this reason, the height of the operating shaft 51 can be made as low as possible.

  For example, as shown in FIG. 14, a posture holding cam portion 77 is integrally formed inside the circumferential cam 70. On the outer periphery of the posture holding cam portion 77, cam surfaces 77a to 77e having a distance from the axial center opposite to the cam surfaces 70a to 70e of the circumferential cam 70 are formed. The posture maintaining peripheral cam portion 77 is set to be slightly smaller than the peripheral cam 70.

On the other hand, the posture holding body 52 is made of a metal plate and is rotatably fitted to the support shaft 60 of the fixed spring receiver. The posture holding body 52 has an upper contact portion 52 a that contacts the posture holding cam portion 77 obliquely from above and a lower support portion 52 b that extends rearward so as to be positioned below the cam receiving portion 71 of the fixed spring receiver 53. In addition, a support piece 52c protrudes outward from the lower end of the lower support portion 52b, and the three rubbers 78 are supported by the support piece 52c. The cam receiving portion 71, a hole 79 for positioning the rubber 78 is formed. The number of rubbers 78 may be one or more. It is also possible to use a coil spring instead of the rubber 78.

  The circumferential cam 70 and the cam receiving portion 71 are sandwiched from above and below by the posture holding body 52, so that the spring unit 50 and the circumferential cam 70 are held inseparable. Therefore, the spring unit 50 rotates regardless of which direction the circumferential cam 70 is rotated.

When the peripheral surface cam 70 is rotated, together with the distance E1 to the upper surface of the axial center cam receiving portion 71 of the operating shaft 51 is changed, the distance to the axial center position holding peripheral surface cam portion 77 of the operating shaft 51 E2 However, the shape of the posture holding peripheral surface cam portion 77 is set so that the dimension of (E1 + E2) becomes substantially constant regardless of how the operation shaft 51 is rotated. The distance dimension E3 between the support body 52c and the posture holding body 52 is also kept substantially constant.

In a state where any one of the cam surfaces 70 a to 70 e of the circumferential cam 70 is in contact with the cam receiving portion 71, the rubber 78 is not compressed at all or is lightly compressed, and the circumferential cam 70 is rotated. When, in the corner portion which is the intersection of the adjacent cam surface rides over, since the cam receiving portion 71 is pushed by the rubber 78 is compressed and deformed, turning back the cam receiving portion 71 by an elastic restoring force of the rubber 78 As a result, the user can grasp the fact that the cam surface contacting the cam receiving portion 71 is switched and the magnitude of the resistance to rocking is switched. In other words, when switching the elasticity, the user can obtain a click feeling from the change in the rotational resistance.

  When the cam 70 is pushed downward during the rotation of the circumferential cam 70, the distance between the lower surface of the cam receiver 71 and the support piece 52c of the posture holding body 52 is reduced to E4. Since (E1 + E2) is substantially the same, E4 is maintained at substantially the same size at any adjustment stage. For this reason, the amount of compression deformation of the rubber 78 is substantially constant regardless of the level of elasticity, and therefore the rotational resistance (or click feeling) is maintained substantially constant when the operation shaft 51 is rotated.

(4). Locking device Next, a locking device for controlling the locking of the backrest 4 will be described mainly with reference to FIGS. The lock device has the back gas cylinder 26 as described above. Back gas cylinder 26 is commercially available, has a cylindrical body 26a, which in a slidably fitted waited rod 26b. In the present embodiment, the rod 26 b protrudes rearward, a support member 80 made of resin or the like is attached to the tip (rear end) of the rod 26 b, and the support member 80 is fitted on the third shaft 32. A nut is non-rotatably fitted to the support member 80, and a male thread formed on the tip of the rod 26b is screwed into this nut. Therefore, the front-rear position of the support member 80 can be adjusted.

  In the support member 80, as an example of the fixed fitting portion described in the claims, a mounting groove 81 into which the third shaft 32 is fitted is formed in a state of opening substantially upward. Therefore, as shown in FIG. 15 (B), the back gas cylinder 26 is fitted in the third shaft 32 with the mounting groove 81 in a substantially vertical posture with the support member 80 facing downward, and then the cylindrical body 26a By changing the posture so as to be directed toward the front, it can be attached to the third shaft 32 in a one-touch manner.

This point will be further described. As clearly shown in FIG. 16B, the mounting groove 81 of the support member 80 is located at the rear and opens upward, so that the rear end portion 80a of the support member 80 is narrow, Of the support member 80, the lower part 80b constituting the lower part of the attachment groove 81 is thicker than the rear end part 80a, and its lower surface is curved downwardly. As shown in FIG. 11A, a space of a dimension L1 is vacant between the third support shaft 32 and the base bracket 30, but the front-rear thickness dimension L3 of the rear end portion 80a of the support member 80. Is set to a dimension much smaller than L1, and the vertical thickness dimension L2 of the lower part 80b of the support member 80 is set to a dimension slightly smaller than L1.

Therefore, by setting the vertical position back gas cylinder 26 as viewed from the side, it is possible to fit the mounting groove 81 of the support member 80 to the third shaft 32, defeating the use position back gas cylinder 26, mounted The lower part 80 b of the support member 80 is supported by the base bracket 30 while maintaining the state where the groove 81 is fitted to the third shaft 32. Accordingly, the support member 80 cannot be moved up and down in use. In FIG. 11A, a slight gap is drawn between the lower part 80b of the support member 80 and the base bracket 30, but actually, the lower part 80b of the support member 80 hits the base bracket 30 from above. Yes.

Theoretically, L2 and L1 may be equal, but L2 is preferably smaller than L1 within a range in which the mounting groove 81 can be held in the third shaft 32. Support member 80 may be supported by other members. The back gas cylinder 26 is attached with the intermediate metal fitting 5 attached to the base 2. Therefore, the base 2 has an open hole 82 into which the back gas cylinder 26 can be fitted from above.

  As shown in FIG. 9A, the support member 80 is held by the base bracket 30 so as not to drop in a state where the back gas cylinder 26 is set in a predetermined posture. Therefore, the back gas cylinder 26 is held so as not to be detached. As shown in FIG. 16B, a lever piece 84 for operating the push valve 83 of the back gas cylinder 26 is fitted into the support member 80 from below. A support shaft portion 85 is formed at the lower end of the lever piece 84, and the support shaft portion 85 is fitted in a bearing groove 86 provided in the support member 80. As shown in FIG. 9A, one end portion of the cable conduit 87 is fixed to the front end of the upper end of the support member 80, and a ball 89 fixed to one end of the wire 88 inserted through the cable conduit 87 is connected to the upper end of the lever piece 84. It is hung on the part. As shown in FIG. 16B, the lever piece 84 is formed with an engagement groove 90 that can be moved upward after the ball 89 is fitted.

The other end of the cable conduit 87 is connected to the left side or the right side of the fixed outer shell 9, and the other end of the wire 88 is connected to a manual operation lever (not shown). The operation lever is selectively held between a locked posture and a free posture. In FIG. 9A, the operation lever is in a locked posture, and in this state, the backrest 4 is held so as not to tilt. When the operating lever is rotated from the state shown in FIG. 9 to the free posture, the lever piece 84 is rotated so that the upper end thereof moves forward, thereby pushing the push valve 83 and the back gas cylinder 26 is expanded and contracted. It becomes a free state freely. Therefore, the backrest 4 can be tilted freely.

A left and right laterally long fourth shaft 91 is attached to the front end portion of the back gas cylinder 26 as an example of the movable fitting portion described in the claims. The fourth shaft 91 has left and right bottom plates and left and right side plates. the pin receiving member 92 and a side plate 92a and the flap piece 92b, which is fitted held from above. That is, the flap piece 92b of the pin receiving member 92 protrudes outward from the upper end of the side plate 92a, and the fourth shaft 91 is fitted from above into the pin receiving groove 93 formed by opening the flap piece 92b and the side plate 92a. Yes. The flap piece 92b of the pin receiving member 92 is fixed to the lower surface of the intermediate fitting 5 with screws 94.

The fourth shaft (pin) 91 is an example of the movable fitting portion (the other fitting portion) described in the claims as described above , and the pin receiving member 92 is an example of the movable member described in the claims. The pin receiving groove 93 is an example of a movable receiving portion (the other receiving portion) . As described above, the pin receiving member 92 is attached to the front end portion of the intermediate fitting 5 serving as the seat receiving member, and the punching hole 82 of the intermediate fitting 8 serving as the seat receiving member extends to the pin receiving member 92. Although formed with reference to FIG. 6 (B), the front stopper 34 is provided at the front end of the recess 33 in the fixed outer shell 9 and is provided at the front end of the intermediate fitting 5. Therefore, as can be understood from FIGS. 6 and 15, the pin receiving groove 93 as the other receiving portion and the fourth shaft 91 as the other fitting portion are covered with the slide outer shell 10 from above. It has been broken.

The fourth shaft 91 is held so that it cannot be pulled out upward and left and right by a stopper 95 that is inserted and attached to the intermediate metal fitting 5 from the front. The stopper 95 is made of resin and has left and right feet 95a extending rearward from the front plate. As shown in FIG. 16 (A) (B), the left and right foot member 95a is formed in a rear view L-shaped so as to surround from the outside and the upper right and left end portions of the fourth shaft 91, left and right feet By the body 95a, the fourth shaft 91 is held so as not to be able to come out upward and in the left-right direction.

A front plate 5c is formed at the front end of the intermediate fitting 5, and a mounting hole 97 through which the foot 95a of the stopper 95 passes is provided in the front plate 5c. Foot body 95a overlaps the lower surface of the intermediate bracket 5. For this reason, even if an upward external force is applied to the fourth shaft 91, it does not bend and deform. As can be clearly seen from FIG. 16 (C), two left and right engaging claws 98 project rearward at the lower end of the front plate of the stopper 95 as an example of the engaging means described in the claims. . The front end (rear end) of the engaging claw 98 has an upward hook shape, and the engaging claw 98 is hooked on the front plate 5c of the intermediate metal fitting 5 from below. Needless to say, the engaging claw 98 is deformed against its elasticity and then caught on the front plate 5 c of the intermediate metal fitting 5. For this reason, the stopper 95 is held so as not to be detached.

(5) Summary As described above, when a seated person leans against the backrest 4, the pusher 62 moves forward to push the movable spring receiver 55, thereby providing resistance to locking. Then, by rotating the operating shaft 51 to rotate the circumferential cam 70, the degree of resistance to rocking can be switched to a plurality of levels (five levels). Needless to say, the number of switching steps of the elasticity adjustment is not limited to five, and can be set to an arbitrary number.

  When the back gas cylinder 26 is used as a locking device as in the present embodiment, the back gas cylinder 26 also acts as a resistance against locking, and therefore there is an advantage that the compression coil spring 54 for locking can be made as small as possible. In particular, in this embodiment, it can be said that the effect of making the back gas cylinder 26 function as a locking spring means is high. This point will be described.

  When the load is supported by the back gas cylinder 26, if the line of action of the load coincides with the axis, the back gas cylinder 26 can accurately support the load without twisting. Therefore, it is preferable to arrange the back gas cylinder 26 so that a load is applied in the axial direction as much as possible.

  In this regard, in this embodiment, as can be understood from FIG. 11A, the third shaft 32 that is the support shaft of the back gas cylinder 26 is located at a height position between the first shaft 16 and the second shaft 25. Since the height of the fourth shaft 91 does not change much even when locked, the line of action of the load acting on the back gas cylinder 26 accompanying the locking is as follows. The posture is close to the axis. For this reason, the capacity | capacitance (elastic restoring force) of the back gas cylinder 26 can be fully exhibited as resistance with respect to the back tilt of the backrest 4. FIG. Further, the durability of the back gas cylinder 26 can be improved.

  In a synchro chair in which the seat tilts backward and backwards in conjunction with the backward tilting of the backrest, when the person is seated, the seat tries to tilt backward while retracting. Therefore, it is necessary to hold the seat so that the seat does not tilt backward or backward only by sitting. When the back gas cylinder 26 is provided, the back gas cylinder 26 also acts as a resistance against the backward movement and backward tilt of the seat 2, but in this embodiment, a general adult (for example, a person having a weight of about 60 kg) is seated. The degree of load is set so that it can be supported only by the back gas cylinder 26.

  That is, the spring unit 50 is set so as not to contract even when a person is seated. For this reason, as shown in FIG. 11C, it is possible to provide a gap of a slight distance S between the movable spring receiver 55 and the pusher 62 in a seated state where the person does not rest on the backrest 4. As a result, the posture change of the spring unit 50 by the operation shaft 51 can be performed with a light force.

Further, there is a slight gap S between the movable spring receiver 55 and the pusher 62 in the non-sitting state, and the compression coil spring 54 is incorporated in the fixed spring receiver 53 and the movable spring receiver 55 in a compressed state. Therefore, when the chair is assembled, the spring unit 50 can be incorporated into the base 2 as it is without being compressed. For this reason, assembling is much easier than in the past. Further, since the front surface of the pusher 62 is Tsu Na in an arc face 62a of curvature centered on the shaft 60, the reaction force of the spring units 50 in a circular arc surface 62a at the time of elastic regulation does not act, the order elastic adjustment operating It can be done lightly.

  Even when the movable spring receiver 55 is in light contact with the pusher 62, the attachment can be performed easily and the rotation operation of the operation shaft 51 can be performed with a light force. If the back gas cylinder 26 is set in a slightly contracted state, the back gas cylinder 26 is pre-tensioned, so that the function of supporting the seating load with the back gas cylinder 26 alone can be further ensured. Become.

Figure 8 (C) as described with reference to the outer end portion 41a which receives the load of the slider receiver 41 is curved upward convex, the non-locking state, the apex portion of the curved outer end 41a The slider 44 is hit. For this reason, even if a load acts on the slider 44 from above, the slider 44 does not slide backward. That is, the slider 44 does not tend to move backward due to the seating load. Therefore, the phenomenon in which the seat 3 moves backward and tilts backward due to the seating is reduced, and as a result, the seat 3 can be prevented from tilting and retracting backward by the seating only with the back gas cylinder 26. .

In this embodiment, the spring unit 50 and the support bracket 38, since the operation shaft 51 with the cam member 73 is configured to resiliently adjustment unit 23 of a mass, it is possible to suppress the trouble of storage and assembly, the assembly error There is an advantage that it can contribute to the improvement of accuracy by eliminating the variation.

  In addition, assembly of a support mechanism part is performed in the following procedure. That is, the pusher 62 is fitted in and attached to the push shaft 18 in advance, the first back frame 14 is set on the base 2, the elasticity adjusting unit 23 is set on the base 2, and the slider 44 is attached and fixed. Insert the front part of the intermediate metal part 5 into the slider 44 from behind, connect the intermediate metal part 5 and the first back frame 14 with the second shaft 25, set the back gas cylinder 26, and attach the stopper 95 to the intermediate metal part 5. The procedure is to do. The pin receiving member 92 is fixed to the intermediate metal fitting 5 in advance. In this embodiment, since there are few screwing places, there exists an advantage which can assemble a chair efficiently and with high precision.

(6). Others present invention can be in addition to various concrete than the above embodiment. For example, the application target is not limited to a movable swivel chair, but can also be applied to a fixed chair such as a theater chair. Needless to say, the present invention can be applied to a chair in which the seat is not synchronized and only the backrest is tilted backward. The elasticity adjustment mechanism can use various concepts. Component of the base or the like, can be adopted various forms as needed.

  The position, posture, and number of back gas cylinders can be arbitrarily designed as necessary. As the synchro mechanism, a horizontally long slide shaft provided at the front part of the seat receiving member (intermediate metal fitting) can be fitted into a long hole with a tilted side view provided on the base. It is only necessary to support the slide shaft with a spring. Various combinations can be adopted for the fitting portion and the receiving portion. It is also possible to employ a fitting that is the reverse of the above embodiment.

The present invention may be embodied in the chair. Therefore, it can be used industrially.

1 Leg support (gas cylinder)
2 Base 3 Seat 4 Backrest 5 Intermediate bracket (seat receiving member)
6 seat outer shell
9 Fixed outer shell constituting the outer shell
10 Slide outer shells 14 and 15 constituting the seat outer shell 16 Back frame 16 First axis (axis serving as a tilting fulcrum of the backrest)
18 Pushing shaft 23 Elasticity adjusting unit 25 Second shaft 26 Back gas cylinder 30 Base bracket as an example of a fixed support member 32 Third shaft as an example of a fixed receiving portion 50 Spring unit 80 Support member 81 Fixed fitting Mounting groove as an example of the part
82 Punching hole 91 The 4th axis (another fitting part) as an example of a movable fitting part
92 Pin receiving member as an example of movable support member 93 Pin receiving groove (another receiving portion) as an example of movable receiving portion
95 Stopper 98 Engaging claw as an example of engaging means

Claims (3)

A seat, a back tiltable backrest, and a back gas cylinder for controlling the tilting of the backrest;
One end of the back gas cylinder is provided with a fixed fitting portion that fits into a fixed receiving portion provided on a fixed support member that does not move even when the backrest tilts backward, and the other end of the back gas cylinder has A movable fitting portion that is fitted to a movable receiving portion provided on a movable member that moves in conjunction with the tilting of the backrest is provided ,
The pair of the fixed receiving portion and the fixed fitting portion, and the pair of the movable receiving portion and the movable fitting portion are configured such that when the back gas cylinder is in a posture different from the use state , one fitting portion is one And when the back gas cylinder is turned to the use posture , the other fitting portion is set to fit into the other receiving portion ,
The other receiving portion is provided on a seat receiving member that supports the seat, and a stopper that prevents the other fitting portion from coming out of the other receiving portion is attached to the seat receiving member. ,
Rocking chair. A seat, a back tiltable backrest, and a back gas cylinder for controlling the tilting of the backrest;
One end of the back gas cylinder is provided with a fixed fitting portion that fits into a fixed receiving portion provided on a fixed support member that does not move even when the backrest tilts backward, and the other end of the back gas cylinder has A movable fitting portion that is fitted to a movable receiving portion provided on a movable member that moves in conjunction with the tilting of the backrest is provided,
The pair of the fixed receiving portion and the fixed fitting portion, and the pair of the movable receiving portion and the movable fitting portion are configured such that when the back gas cylinder is in a posture different from the use state, one fitting portion is one And when the back gas cylinder is turned to the use posture, the other fitting portion is set to fit into the other receiving portion,
Furthermore, a plug-in type stopper is provided to prevent the other fitting part from coming out of the other receiving part, and the stopper is held so as not to come off by an elastically deforming engagement means.
Russia Kkingu chair. A base is provided at an upper end of the leg, and the backrest is provided on a back frame that is connected to the base so as to be tiltable rearward. A seat receiving member that supports a seat is disposed on the base. While arranged to be tilted backwards or retracted in conjunction with tilting backwards,
The back gas cylinder is disposed below the seat receiving member in a posture extending in the front-rear direction, and the movable fitting is provided at the front end by providing the fixed fitting portion at the rear end of the back gas cylinder. Part
And, in the seat receiving member, there is formed a hole in an upper and lower opening for enabling the mounting of the back gas cylinder in a state where the seat receiving member is connected to the base and the back frame.
The rocking chair according to claim 1 or 2.

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