JP5869791B2 - Rocking chair - Google Patents

Description

The present invention is related to a locking chair child.

In rocking chairs, torsion bars, leaf springs, or rubber are also used as means for imparting resistance to back tilting of the backrest, but it is surmised that compression coil springs are overwhelmingly the actual usage rate. . The reason why compression coil springs are frequently used is that they are excellent in reliability and easy to design, have a wide variety of products, or can obtain the necessary elasticity while being relatively compact. Is mentioned. In any case, the compression coil springs are supported by the front and rear spring receivers, and are assembled to the bases provided at the upper ends of the legs.

The locking spring means is loaded even when a person is not leaning against the backrest. That is, a pretension (preliminary load) is applied to the spring means. This is because if the pretension is not applied, the backrest suddenly leans back greatly without resistance due to the leaning of the person, and it is dangerous. Further, in the case of a synchro chair in which the seat tilts backward in conjunction with the back tilt of the backrest, the pre-tensioning of the locking spring also plays a role of holding the seat so that it does not tilt backward only by sitting.

  Conventionally, as a method of applying pretension to the compression coil spring, a movable spring receiver is mounted from a method in which another member is incorporated while the compression coil spring is compressed by a jig or a state in which no load is applied to the compression coil spring. The method of moving is adopted.

On the other hand, the rocking chair is generally provided with an elasticity adjusting means for changing the magnitude of the resistance of the spring means against the backward tilting of the backrest (that is, the magnitude of the reaction force of the backrest acting on the body during locking). The elasticity adjusting device, and stepless system using a rotary screw, there is a stage system using a cam or lever.

The mechanism for changing the magnitude of the resistance of the spring means is roughly classified into a system for changing the magnitude of the initial pressurization to the spring means and a system for changing the moment acting on the spring means. As a latter method, Patent Document 1 discloses a configuration in which a compression coil spring is fitted in two telescopic spring receivers, one spring receiver is rotatably connected to a base, and the other spring receiver receives a locking load. , by moving the other spring receiving at knob with adjustment screw, rotating the compression coil spring is disclosed.

Japanese Patent No. 2519167

  Among the conventional methods of applying pretension to the compression coil spring, the method of incorporating other members while the compression coil spring is compressed with a jig is troublesome and troublesome for safety management. There is. On the other hand, the method of moving the movable spring receiver from a state in which no load is applied to the compression coil spring is problematic in that it can only be used for the screw-type adjusting means, and the workability is increased because the knob must be rotated many times. There is a bad problem.

  The present invention has been made to improve the current situation.

The present invention includes the structures of the claims. Of these, the rocking chair of the invention of claim 1
A seat, a backrest that can be tilted backward, a compression coil spring that provides resistance to the rear tilt of the backrest, a first spring receiver that supports one end of the compression coil spring, and the other end of the compression coil spring. A second spring receiver ,
The pre-Symbol first and second spring bearing, by receiving the compression omission impossible a and two spring out of the coil spring in a state of pre-compression is connected so as to be freely perspective dynamic one another, compressing the received the two spring In the basic configuration that the coil spring and the spring unit are formed,
The spring unit can be rotated around an axis parallel to the pivot axis of the backrest and can change the posture viewed from the pivot axis direction of the backrest. The moment acting on the spring unit is adjusted by moving the point of application of the load to and away from the rotation fulcrum of the backrest as the posture of the spring unit changes.

The invention of claim 2 embodies claim 1 and in this invention, the first spring receiver has a cylindrical shape opened toward the second spring receiver, and the inside of the first spring receiver The second spring receiver is slidably fitted, and the compression coil spring is disposed in a space formed by the first spring receiver and the second spring receiver.

The invention of claim 3 has the same basic structure as that of claim 1, further comprising a pressing portion for applying a load accompanying the rearward tilting of the backrest to one end of the spring unit, as viewed from the rotational axis direction of the backrest. in the side view, an end and the pressing part of the spring unit is in the earthenware pots by contact with a point contact state.

According to a fourth aspect of the present invention, in the same basic configuration as in the first aspect, the seat tilts at least rearward in conjunction with the rear tilt of the backrest, and the tilt of the backrest is regulated by restricting the movement of the seat. The locking gas cylinder for controlling the position is arranged so that the rearward tilting of the seat due to the seating can be prevented only by the locking gas cylinder. According to a fifth aspect of the present invention, in the same basic configuration as in the first aspect, the seat is interlocked so as to tilt at least backward in conjunction with the backward tilting of the backrest, and the tilting of the backrest is regulated by restricting the backward tilting of the seat. A lock gas cylinder for controlling the load, and by applying resistance to the rear tilt of the seat with the lock gas cylinder, the seat does not tilt backward only when a person is seated. Is set not to work.

According to a sixth aspect of the present invention, in the same basic configuration as in the first aspect, the backrest is attached to a back frame that rotates about a laterally long axial center, and a pressing portion provided on the back frame is used for the spring unit. One end is pressed , and the spring unit is pivotally connected to a support member so that one end thereof moves far and away with respect to the pivot point of the back frame. The pressing surface of the pressing portion facing the spring unit is formed in an arc surface having a curvature around the rotation fulcrum of the spring unit, and is operated by a seated person to rotate the spring unit. An operation means for changing the moving posture is provided.

The invention of claim 7 is the same basic structure as claimed in claim 1, before Symbol backrest is attached to the back frame to rotate about the axis of the left and right horizontal, the spring units pressed portion provided on the back frame The seat and the backrest are interlocked so that the seat is tilted backward at least when the backrest tilts backward, and the spring unit has one end at the pivot point of the back frame. On the other hand, it is pivotally connected to the support member so that it can move far and away. When the spring unit is rotated by the operating means, the moment acting on the spring unit is changed, and the resistance against rocking can be adjusted. And a locking gas cylinder for controlling the tilting of the backrest, and the locking gas cylinder provides resistance to the rear tilting of the seat. By, only people seated load on the spring unit without tilting after loci is set so as not to act.

  In the present invention, since the compression coil spring is set in one spring unit in a pre-tensioned state, it is not necessary to set it while pre-tensioning using a jig or the like when incorporating it into a chair. For this reason, assembly work can be performed safely and quickly. In addition, since the compression coil spring and the two spring receivers are integrated, the trouble of storing and managing the members can be reduced.

Various means can be adopted as the means for connecting the first spring receiver and the second spring receiver inseparably, but connecting with a pin as in the embodiment is advantageous in terms of cost because the connecting structure becomes simple. Also, by adopting a configuration in which integrated the boss to receive a spring as in the embodiment, since the boss portion can be provided regardless of the position of the compression coil spring, compact and short as possible the total length of the spring unit Can contribute.

When making it possible to adjust the reaction force against locking, it is possible to change the pretension of the compression coil spring by the operating means, but when adopting the method of changing the posture of the spring unit as in claims 6 and 7 , for example, use cam as shown in the embodiment, there is an advantage that allows a very easy elastic adjusting. In this case, as in claim 6, by forming the pressing surface of the pressing portion in an arcuate surface of the curvature around the rotation fulcrum of the spring unit, be rotated smoothly even shift the spring unit to which position Can do.

Further, in a synchro-type chair in which the seat tilts backward in conjunction with the back tilt of the backrest, it is necessary to support the rear tilt of the seat with elastic means so that the seat does not tilt backward only by sitting , When the configurations 5 and 7 are adopted, the rear tilt of the seat is prevented by the backrest control gas cylinder, so that no or almost no load is applied to the compression coil spring of the spring unit when the person is not leaning against the backrest. Can be kept in a state that is not. Therefore, the turning operation of the spring unit can be performed with a light force.

(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. It is a schematic diagram which shows other embodiment.

  Next, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment shown in FIGS. 1 to 16 will be described. 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.

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 provided with a fixed outer shell 9 which is fixed to the intermediate sleeve 5 is constituted by a slide outer shell 10 that protrudes to the front, sliding outer shell 10 is fixed outer shell 9 It is attached to slide freely.

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, the resin of the back inner shell (back plate) 12 has a cushion member 13 arranged superposed on the front surface, the cushion member 13 and the back inner shell 12 It is completely covered with a bag-like 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.

For example, as shown in FIG. 5, the front part of the left and right arm parts 14b in the first back frame 14 is a crank part 14c that enters the left and right inner sides, and the first shaft 16 penetrates the base end part of the crank part 14c. doing. Further, the front ends of the left and right crank portions 14c are integrally connected by a laterally long pushing shaft 18 constituting a pressing portion described in the claims. 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). The second back frame 15 is made of resin or aluminum die-cast, and two left and right square pillars 15a are projected upward at the rear end. 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 , as shown in FIGS. 3 and 5, 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 locking gas cylinder 26 is disposed on the elasticity adjusting unit 23 as a locking device for locking the backrest 4 at an arbitrary rearward tilt angle.

(2). The following base seat outer shell, with reference also to FIG. 6 and subsequent drawings in addition to the figures previously, details of each part. 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. The bottom plate of the bottom plate and the base 2 of the base bracket 30 and the bush 31 of the upper and lower openings is welded, to the bush 31, the upper end of the leg support post (gas cylinder) 1 is fitted from below. The left and right side plates 30a of the base bracket 30 pass through a horizontally long third shaft 32, and the lock gas cylinder 26 is supported by the third shaft 32 so as not to move forward. 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 are provided at the front end of the upper surface of the intermediate bracket 5, while a tunnel-shaped receiving portion into which the forward stopper 34 fits from behind is provided at the front end of the recess 33 in the fixed outer shell 9. 35 is formed integrally.

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. The overhanging portion 29 a is fastened together 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, an outer end portion of the laterally projecting portion 43 is provided. A resin slider 44 mounted on the lower surface is in contact with the slider receiver 41 from above.

For example, as shown in FIGS. 8 and 12, the upper surface of the outer end portion of the slider receiver 41 that supports the slider 44 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, as shown in FIGS. 8 and 12, the upper portion of the outer end portion of the slider receiver 41 is a protruding portion 41 a projecting outward in the left and right sides, and as shown in FIG. A stopper piece 45 (see also FIG. 16A) positioned below the protrusion 41a of the slider receiver 41 is bent. Accordingly, the front portion of the intermediate metal fitting 5 is held so as not to move upward. Therefore, even if the front portion of the seat 3 is lifted upward , 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 53 and exposed rearward, The movable spring receiver 55 is slidably fitted to the fixed spring receiver 53. In this embodiment, the fixed spring receiver 53 corresponds to the first spring receiver described in the claims, and the movable spring receiver 55 corresponds to the second spring receiver described in the claims. The movable spring receiver 55 has a substantially square shape. For this reason, the interior of the fixed spring receiver 53 is also substantially in the shape of a square. Further, 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 53.

The fixed spring receiver 53 and the movable spring receiver 55 are penetrated by laterally long pins 58 as an example of connecting means, and the pin insertion hole 59 of the fixed spring receiver 53 is formed into an elongated hole in the front and rear directions, thereby moving the movable spring. The back and forth slide of the receptacle 55 is allowed. A support shaft 60 projecting outward in the left and right directions is provided at the front end of the fixed spring receiver 53 , 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 constituting the pressing portion described in the claims is attached to the push shaft 18 provided at the front end of the first back frame 14, and the pusher 62 moves the movable spring. The receiver 55 is pushed. The rear end portion of the movable spring receiver 55 has a mountain shape that protrudes backward in a side view . Therefore, the movable spring receiver 55 and the pusher 62 abut in a point contact manner in a side view.
On the other hand, the front surface (pressing surface) of the pusher 62 is an arc surface 62a having a radius of curvature centered 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 . For this reason, the pusher 62 is held so that it cannot be displaced left and right and cannot be rotated. A longitudinal groove is formed on the front surface of the pusher 62 in order to prevent a single contact with the movable spring receiver 55. Incidentally, the front surface of the pusher 62, it is also possible to mount an excellent lining material wear resistance.

Further, the engaging hole 65 is provided in the bottom plate 63 b of the positioning member 63, and the engaging claw 66 that fits into the engaging hole 65 is formed in the pusher 62, and the engaging claw 66 is engaged with the engaging hole 65. 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, an auxiliary groove 62b opened rearward is formed over the entire length of the left and right. The auxiliary groove 62b is for temporarily holding the first back frame 14 by fitting the front back support piece 2a formed in the base 2 when the first back frame 14 is attached. 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. An arcuate guide hole 68 that is movably fitted is formed. 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. Further, the other end of the operation shaft 51, wearing the retaining clip 75 missing. 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.

Now, when turning the circumferential face cam 70, the distance E1 to the upper surface of the axial center cam receiving portion 71 of the operating shaft 51 together with the changes, to the axial center position holding peripheral surface cam portion 77 of the operating shaft 51 distance E2 also changes, but in how to rotate the operating shaft 51, as the dimensions of the shown in FIG. 14 (B) (E1 + E2 ) is substantially constant, the shape of the posture holding peripheral surface cam portion 77 By setting, the distance E3 between the lower surface of the cam receiving portion 71 and the support piece 52c of the posture holding body 52 is also kept substantially constant. That is, when the spring unit 50 is rotated by the rotation of the operation shaft 51, the posture holding body 52 is also rotated in the rotation direction of the spring unit 50. Therefore , the dimension of E3 is independent of the posture of the spring unit 50. Is held 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 phenomenon that occurs, thereby, the user can grasp switched a cam surface in contact with the cam receiving portion 71, the fact that the magnitude of the resistance is switched for locking in touch. 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. by (E1 + E2) is substantially the same, E4 are also held substantially in the same size at any stage. For this reason, the amount of compression deformation of the rubber 78 is substantially constant regardless of which stage the elasticity is switched. Therefore, when the operating shaft 51 is rotated, the rotational resistance (or click feeling) is kept substantially constant.

(4). Locking device Next, a locking device for controlling the locking of the backrest 4 will be described mainly with reference to FIGS. The locking device has the locking gas cylinder 26 as described above. The locking gas cylinder 26 is a commercially available product, and has a cylindrical body 26a and a rod 26b slidably fitted on the cylindrical body 26a. 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.

The support member 80, is formed in a state where the third shaft 32 is substantially open upward the whole mounting groove 81 fit. Accordingly, as shown in FIG. 15 (B), lock the gas cylinder 26 is fitted from the to-and-raised attitude as to open the attachment grooves 81 in a substantially downward, the support member 80 to the third shaft 32, then, By changing the posture so that the cylindrical body 26a faces forward, it can be attached to the third shaft 32 in a one-touch manner. The lock gas cylinder 26 is attached in a state where the intermediate fitting 5 is attached to the base 2. Therefore, the base 2, and holes 82 which can be fitted from the top open the locking gas cylinder 26.

As shown in FIG. 9A, the support member 80 is held by the base bracket 30 so as not to drop when the locking gas cylinder 26 is set in a predetermined posture. Therefore, the lock 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 locking 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 is moved forward, whereby the push valve 83 is pushed and the locking gas cylinder 26 is expanded and contracted. It becomes a free state freely. Therefore, the backrest 4 can be tilted freely.

A horizontally long fourth shaft 91 is attached to the front end portion of the locking gas cylinder 26. The fourth shaft 91 is attached to a pin receiving member 92 having left and right bottom plates, left and right side plates 92a, and a flap piece 92b. It is fitted and 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 metal fitting 5 with screws 94.

The fourth shaft 91 is held so that it cannot be removed upward and left and right by a stopper 95 that is inserted and attached to the intermediate bracket 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. 16C, two left and right engaging claws 98 project backward from the lower end of the front plate of the stopper 95. The tip of the engaging pawl 98 (the rear end) is turned upward hook shape, the engaging pawl 98 is hooked from below the front plate 5c of the intermediate sleeve 5. Needless to say, the engaging claw 98 is caught from the deformed against its elasticity before plate 5c of the intermediate sleeve 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 locking gas cylinder 26 is used as a locking device as in the present embodiment, the locking 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 causing the locking gas cylinder 26 to function as a locking spring means is high. This point will be described.

  When the load is supported by the lock gas cylinder 26, if the line of action of the load coincides with the axis, the lock gas cylinder 26 can accurately support the load without twisting. Therefore, it is preferable to consider that the lock gas cylinder 26 is loaded 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 locking gas cylinder 26 is located at a height position between the first shaft 16 and the second shaft 25. And the fact that the height of the fourth shaft 91 does not change so much even when locked, the line of action of the load acting on the locking gas cylinder 26 along with locking is such that the locking gas cylinder 26 The posture is close to the axis. For this reason, the capability (elastic restoring force) of the locking gas cylinder 26 can be fully exhibited as a resistance against the backward tilting of the backrest 4. Further, the durability of the lock 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 lock gas cylinder 26 is provided, the lock 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 with a weight of about 60 kg) is seated. The degree of load is set so that it can be supported only by the locking 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 preliminarily compressed to the fixed spring receiver 53 and the movable spring receiver 55. by the fact that built-in, hold such it takes pretension, when assembling the chair, the spring unit 50 may be incorporated into the base 2 as it is without shortening press. For this reason, assembling is much easier than in the past. Further, since the front surface of the pusher 62 is in the arcuate surface in a circular arc surface 62a of curvature centered on the shaft 60, when the resilient regulation, the reaction force of the spring unit 50 does not act on the arc surface 62a, Therefore Elasticity adjustment operation can be performed easily.

  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 lock gas cylinder 26 is set in a slightly contracted state, the lock gas cylinder 26 is pre-tensioned, so that the function of supporting the seating load only with the lock gas cylinder 26 is further ensured. Become.

  As described with reference to FIG. 8 (C), the outer end 41a receiving the load of the slider receiver 41 is curved upwardly convex, and in the non-locking state, the slider is placed on the apex of the curved outer end 41a. 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 2 moves backward and tilts backward due to the seating is reduced, and as a result, the seat 2 can be prevented from tilting and retracting backward by the seating only with the locking gas cylinder 26. .

In this embodiment, the spring unit 50 and the support bracket 38, because it is composed elasticity adjustment unit 23 of a mass operating shaft 51 with the cam member 70, 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 gas cylinder 26 for locking, 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). Second Embodiment Next, a second embodiment shown in FIGS. 17 and 18 will be described. This embodiment is a modification of the elasticity adjusting unit, and the major difference from the first embodiment is that the configuration of the posture holding means for holding the circumferential cam 70 and the spring unit 50 in an overlapped state is different. It is.

In the second embodiment, the posture holding body 52 is made of resin, and the right and left posture holding bodies 52 are connected by the joint 100, and the left and right posture holding body 52 is connected to the cam of the fixed spring receiver 53 as an example of an elastic portion. A spring portion 101 that is in contact with the guide protrusion 71a protruding from the receiving portion 71 from below is provided integrally. The spring portion 101 is formed in a mountain shape that is thin and has a convex shape upward in a side view. Therefore, the rotation of the circumferential cam 70 is allowed by the bending and deformation of the spring portion 101. In this embodiment, since the spring part 101 is integrally formed with the attitude | position holding body 52, it can contribute to the cost suppression by reduction of a number of members, and an assembly workability improvement.

The joint 100 is for connecting the right and left posture holding bodies 52 together, and is formed in a forward convex mountain shape in plan view. For this reason, the space | interval of the left-right attitude | position holding body 52 can be expanded by deform | transforming the joint 100 so that it may extend in the left-right direction. As a result, despite those left and right attitude holding member 52 are integrally molded, it can be fitted to the support shaft 60 of the receiving fixing spring.

  Needless to say, the left and right posture holding bodies 52 may be separated or connected by separate joints without being integrally formed. The support bracket 38 is provided with a corner portion 38a projecting forward, and a bearing hole 102 into which the first shaft 16 is fitted is formed in the corner portion 38a.

When the spring unit 50 is pushed by the pusher 62, the spring unit 50 may tend to rotate upward. For this reason, the support bracket 38 may also tend to float at its rear portion. If it fits in the 1st axis | shaft 16, the floating of the support bracket 38 can be prevented reliably with a simple structure. As shown in FIG. 18B, a collar 38a that fits into an engagement hole (not shown) provided in the base 2 is formed at the lower end of the rear portion of the support bracket 38. Prevents floating.

  As can be understood from FIG. 18B, the pin 58 that connects the movable spring receiver 55 and the cylindrical member 53 is held by the posture holding body 52 so that it cannot be removed from the left and right.

In the first embodiment, the arcuate guide hole 68 is formed in the support bracket 38 as the rotation stroke restriction means of the spring unit 50. However, in this embodiment, the rotation stroke is restricted by the circumferential cam 70. ing. That is, the corner portion when called for convenience the end corner of a height (dimension from the rotation axis) and the end corner portion of the first cam surface 70a between the first cam surface 70a and the fifth cam surface 70e The difference between the height of the first cam surface is set to a size larger than the size of E3, and the difference between the height of the fifth cam surface 70e and the height of the end corner portion is set to a size larger than the size of E3. The end corner portion of the circumferential cam 70 is held by the cam receiving portion 71 even if the transition from the 70a to the fifth cam surface 70e is attempted or the transition from the fifth cam surface 70e to the first cam surface 70a is attempted. To prevent rotation. This simplifies the structure. Of course, similarly to the first embodiment, a stroke restricting means such as a long hole may be provided separately.

(7). Other Embodiments / Others FIG. 19 schematically shows another embodiment. In this embodiment, a cylindrical body 107 is provided on a fixed spring receiver 106 that is rotatably connected to the base 2, while a movable spring receiver 108 that receives a load of a pushing portion (not shown) slides on the cylindrical body 107. An inner shaft 109 that fits freely is provided, and a compression coil spring 110 is fitted to the cylinder body 107 and the inner shaft 109 from the outside. Therefore, the compression coil spring 110 is exposed. In this embodiment, the posture of the spring unit 50 is changed by pressing the movable spring receiver 108 with the circumferential cam. The fixed spring receiver 106 and the movable spring receiver 108 are held by bolts 111 so that they cannot be removed. A boss 60 is provided on the fixed spring receiver 106.

The present invention can be embodied in various ways other than the above-described 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. Elasticity adjusting mechanism is not limited to rotation scheme of the spring unit by a cam, for example, as disclosed in Japanese Patent No. 2519167, a method is also rotating the spring unit by turning several times the adjustment screw can also be used. Various forms can be adopted as necessary for the structural member such as the base. The first and second spring receivers can adopt various forms. It is also possible to arrange a plurality of compression coil springs in parallel in one spring unit.

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 14, 15 Back frame 16 Axis 1 (Axis that serves as a tilting fulcrum for the backrest)
18 Pushing shaft constituting the pressing portion 23 Elasticity adjusting unit 25 Second shaft 26 Gas cylinder for locking 32 Third shaft 38 Support bracket 50 Spring unit 51 Operation shaft 52 Posture holder 53 Fixed spring receiver (first 1 spring support)
54 Compression coil spring constituting the spring unit 55 Movable spring receiver (second spring receiver) constituting the spring unit
58 Pins constituting the connecting means 59 Long holes constituting the connecting means 62 Pushers constituting the pressing portions
70 Circumferential cams constituting the elasticity adjustment unit

Claims (7)

A seat, a backrest that can be tilted backward, a compression coil spring that provides resistance to the rear tilt of the backrest, a first spring receiver that supports one end of the compression coil spring, and the other end of the compression coil spring. A second spring receiver ,
Pre Symbol first and second spring bearing, by receiving the compression omission impossible a and two spring out of the coil spring in a state of pre-compression is connected so as to be freely perspective dynamic one another, compressing the received the two spring A coil spring and a spring unit,
The spring unit can be rotated around an axis parallel to the pivot axis of the backrest and can change the posture viewed from the pivot axis direction of the backrest. The moment of acting on the spring unit is adjusted by moving the point of action of the load with respect to the rotational fulcrum of the backrest as the posture of the spring unit changes.
Rocking chair. The first spring receiver has a cylindrical shape that opens toward the second spring receiver, and the second spring receiver is slidably fitted inside the first spring receiver. The rocking chair according to claim 1 , wherein the compression coil spring is disposed in a space formed by a second spring receiver . A seat, a backrest that can be tilted backward, a compression coil spring that provides resistance to the rear tilt of the backrest, a first spring receiver that supports one end of the compression coil spring, and the other end of the compression coil spring. A second spring receiver,
By connecting the first and second spring receivers so that they cannot be removed when the compression coil springs are pre-compressed, and the two spring receivers can move to and away from each other. A spring and a spring unit,
It has a pressing part for applying a load accompanying the back tilt of the backrest to one end of the spring unit, and the one end of the spring unit and the pressing part are points in a side view as viewed from the direction of the pivot axis of the backrest. Abut in contact,
Rocking chair. A seat, a backrest that can be tilted backward, a compression coil spring that provides resistance to the rear tilt of the backrest, a first spring receiver that supports one end of the compression coil spring, and the other end of the compression coil spring. A second spring receiver,
By connecting the first and second spring receivers so that they cannot be removed when the compression coil springs are pre-compressed, and the two spring receivers can move to and away from each other. A spring and a spring unit,
The seat is tilted at least backward in conjunction with the backward tilting of the backrest, and a locking gas cylinder that controls the tilting of the backrest by regulating the movement of the seat is configured to tilt the rearward of the seat by seating. Is arranged so that it can be blocked only by the locking gas cylinder,
Russia Kkingu chair. A seat, a backrest that can be tilted backward, a compression coil spring that provides resistance to the rear tilt of the backrest, a first spring receiver that supports one end of the compression coil spring, and the other end of the compression coil spring. A second spring receiver,
By connecting the first and second spring receivers so that they cannot be removed when the compression coil springs are pre-compressed, and the two spring receivers can move to and away from each other. A spring and a spring unit,
The seat is interlocked so as to tilt at least backward in conjunction with the back tilt of the backrest, and has a lock gas cylinder that controls the tilt of the backrest by regulating the back tilt of the seat, By giving resistance to the rearward tilt of the seat with the gas cylinder for locking, it is set so that the load does not act on the spring unit because the seat does not tilt backward if only a person is seated,
Rocking chair. A seat, a backrest that can be tilted backward, a compression coil spring that provides resistance to the rear tilt of the backrest, a first spring receiver that supports one end of the compression coil spring, and the other end of the compression coil spring. A second spring receiver,
By connecting the first and second spring receivers so that they cannot be removed when the compression coil springs are pre-compressed, and the two spring receivers can move to and away from each other. A spring and a spring unit,
The backrest is attached to a back frame that rotates about a horizontally long axis, and one end of the spring unit is pressed by a pressing portion provided on the back frame,
The spring unit is pivotally connected to a support member so that one end thereof is moved in a distance with respect to a pivotal fulcrum of the back frame, while a pressing portion of the pressing portion of the back frame facing the spring unit. The surface is formed in a circular arc surface having a curvature around the rotation fulcrum of the spring unit, and includes an operation means that is operated by a seated person to change the rotation posture of the spring unit.
Rocking chair. A seat, a backrest that can be tilted backward, a compression coil spring that provides resistance to the rear tilt of the backrest, a first spring receiver that supports one end of the compression coil spring, and the other end of the compression coil spring. A second spring receiver,
By connecting the first and second spring receivers so that they cannot be removed when the compression coil springs are pre-compressed, and the two spring receivers can move to and away from each other. A spring and a spring unit,
The backrest is attached to a back frame that rotates about a horizontally long axis, and one end of the spring unit is pressed by a pressing portion provided on the back frame, and the seat and the backrest are the backrest. When the seat tilts backward, the seat interlocks to tilt at least backwards,
The spring unit is pivotally connected to a support member so that one end thereof moves far and away with respect to a pivotal fulcrum of the back frame. When the spring unit is rotated by an operating means, the spring unit is connected to the spring unit. The acting moment changes and the resistance against rocking can be adjusted.
And it has a gas cylinder for lock which controls tilting of the backrest, and by giving resistance to back tilt of the seat with the gas cylinder for locking, the seat does not tilt backward only by a person sitting. Is set so that no load acts on the spring unit,
Rocking chair.

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