JP5026782B2 - Chair - Google Patents

Description

  The present invention relates to a rocking chair using a gas cylinder (gas spring) as a leg support.

The use of a gas cylinder as a leg column is widely performed, and in this case, as a matter of course, an operation means for releasing the lock of the gas cylinder is provided. Although the operating means is configured have been proposed and embodied in various, in any event, being adapted to push down the push valve projecting from the upper end of the gas cylinder by the pressing member of Te co expression like, the pressing member Is generally attached to a member to which a gas cylinder is fixed.

In addition, the lifting operation of the seat is performed by a seated person turning or lifting the sitting operation tool.As a method of transmitting the movement of the sitting operation tool to the movement of the pressing member, a wire or bar is used. There are one using a bent interlocking member and one using a wire (cable tube) inserted through a tube. The latter example is described in Patent Document 1 , for example.

On the other hand, a rocking chair in which the backrest tilts backward is often provided with a locking device for switching the backrest between a lockable state and a non-lockable state, and switching a range in which the backrest can be locked. In the case of locking the backrest in non locking the case to lock the neutral state, for example not inclined backward at all, the case of locked state form, taken tilted backward, a case of locking the intermediate position tilted backward to some extent There can be.

The locking lock device is a type that stops or suppresses the movement of the member moving with the backrest by the lock body, and a gas cylinder that expands and contracts in conjunction with the tilting of the backrest, and locks and unlocks this gas cylinder. It is divided roughly into. In the latter case, it can be said that the device for locking and unlocking the gas cylinder is a locking device in a substantial sense. In addition, in synchro-type chairs in which the seat is tilted backward while moving backward in conjunction with the back tilt of the backrest, the seat is often connected to the support base by a slide shaft. Often the movement is stopped or suppressed.
JP 2004-49718 A

  In a chair in which the leg strut is formed of a gas cylinder, a gas cylinder lifting operation device is indispensable, and in a rocking chair, it is preferable to provide a rocking lock device for a backrest. However, conventionally, the elevating operation device and the locking lock device are manufactured separately and assembled separately. Therefore, it takes time to manage the members and assemble the chair.

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

The chair according to the present invention is a gas cylinder as a leg column, a support base fixed to the upper end portion of the gas cylinder, a seat portion disposed above the support base, and can be tilted backward to the base or the seat. and a backrest which is connected to a spring means for supporting the tilting elastically after said backrest, seated occupant and a pressing member operated to operate the seat for operation tool depressing push valve of the gas cylinder, seated person is provided with a stop or suppress the locking body tilting of the backrest actuated to operate the back-manipulation tool, before SL and a pressing member and a locking member, integral attached to the support base It is provided on the operating part base material .
Further, the lock body is slidably mounted on the operation portion base material, and the tilt of the backrest is controlled by the lock body sliding and changing its position. The sliding operation is performed by a locking wire that is pulled by the back operation tool, and a holding portion that holds an end portion of the tube in which the locking wire is fitted is provided on the operation portion base material. On the other hand, the pressing member is actuated by a seat wire that is pulled by operation of the seat operating tool, and the tube of the tube in which the seat wire is fitted to the operation portion base material. A holding portion for holding the end portion is provided.

The present invention can be developed in various ways depending on the difference in the structure of the chair. One example is given in claim 2. That is, in the invention of claim 2, before Symbol support base being linked to the rear tilting swing frame extending behind, with the previous SL backrest to the swing frame is attached, the rocking The frame is provided with an intermediate member disposed above the support base, and the intermediate member is prevented from tilting backward when the intermediate member hits the lock body, while the pressing member is rotatable. The pressing member is rotatably attached to the operating portion base material.

The “operating tool” in the present invention refers to an object that a seated person can move by hand, and there is no limitation on the manner of movement such as rotating, rotating, and sliding. The operation tool is a generic name, and specifically, it is often called a lever, a knob, a handle, or the like. There is no limitation on the position where the operation tool is attached, and it is sufficient if the seated person can operate it. When using a tube inlet Ri wire (cableway tube) is as in the present invention, it is also possible to provide for example the armrest device.

Further, in the present invention, “seat” is synonymous with “seat portion”. Therefore, when the seat inner shell and the seat outer shell are provided as in the embodiment, the seat outer shell is also included in a part of the seat. . The “support base” is a concept including a single object and a composite object. Further, for example, the "attachment" used such as "attaching the operating portion base material", and if attached directly to the supporting base or the like, that include a case where indirectly attached via another member.

In the present invention, the pressing member for releasing the lock of the gas cylinder as the leg support and the locking means for stopping or suppressing the movement of the backrest are incorporated in a common integrated operation unit base material (the whole Since it can be unitized into one unit, the labor of member management can be reduced, and the labor of assembling the chair can be reduced to improve the assembly efficiency.

Further, in order to operate a wire encased in a tube and the push member and the locking member has the advantage that can be arbitrarily set the positions of the operation tool such as a lever, for example, pre-operation unit based on the wire-in-tube by keeping attached to wood, simply by fixing the operating portion base member to the support base, it is possible to complete the installation of the elevator operation device and the locking locking device for the support base, it performed well more efficiently the chair assembly operations.

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

(1). Outline of chair First, an outline of a chair will be described mainly based on FIGS. 1 to 7A. 1 is an overall perspective view of the chair, FIG. 2A is a front view of the chair, FIG. 1B is a side view of the chair, and FIG. 3 is a partially broken side view showing the support means of the seat, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a perspective view of the swing frame, FIG. 6A is a perspective view of the interlock member, and FIG. 6B is a connection between the interlock member and the swing frame. FIG. 7A is a perspective view of the support base, and FIG. 7B is a perspective view of the operation unit base material.

  The chair includes a leg 1, a seat 2, and a backrest 3. The leg 1 includes a group of branch legs 1a extending horizontally and a leg support 4 made of a gas cylinder. A support base 5 made of a metal plate that opens upward is attached to the upper end of the leg support 4. . As shown partially in FIG. 3, the seat 2 has a structure in which a resin seat inner shell 2 a having a cushion on its upper surface is supported by a resin seat outer shell 6 from below. The seat inner shell 2a and the seat outer shell 6 are fastened with screws.

As clearly shown in FIG. 2, the front portion of the seat outer shell 6 constituting the seat 2 is connected to the support base 5 via the left and right front support links 7 and the left and right laterally long first support shafts 8. Yes. The first support shaft 8 may be rephrased as a slide shaft. A pair of left and right front bearing portions 9 sandwiching the front support link 7 from both the left and right sides are integrally formed at the front portion of the seat outer shell 6, and the front bearing portion 9 and the front support link 7 are connected to the front pin 10. Are connected so as to be relatively rotatable.

  A pair of left and right swing frames 11 are disposed on both left and right sides of the support base 5 so as to be tilted backward as viewed from the side and extend rearward of the support base 5. The back frame 12 is fixed. In the present embodiment, the swing frame 11 and the back frame 12 constitute a back support frame. The swing frame 11 and the back frame 12 may be integrated.

For example, as shown in FIG. 3, the swing frame 11 is connected to the rear portion of the support base 5 by a second support shaft 13 so as to tilt backward about the front end portion thereof. The rear portion of the seat outer shell 6 constituting the seat 2 and the swing frame 11 are connected to each other via a pair of left and right rear support links 14 so as to be relatively rotatable. A rear bearing portion 15 for connecting the rear support link 14 protrudes from the seat outer shell 6, and the rear bearing portion 15 and the rear support link 14 can be relatively rotated by a rear pin 16 (see FIG. 2). It is connected to.

Further, as shown in FIG. 3, the left and right swing frame 11 has a box-like receiving member 17 that is upwardly open the interlocking mechanism is disposed is integrally fixed to, the receiving member 17 and the rear support link 14 The lower end of the shaft is connected to the drive shaft 18 so as to be relatively rotatable. Therefore, the rear support link 14 and the swing frame 11 are connected via the receiving member 17 so as to be relatively rotatable.

In the neutral state a person is not seated (basic posture), the front support link 7 and the rear support link 14 is inclined backward slightly with respect to the vertical line in side view, Therefore, supporting a person seated link 7 , 14 is tilted rearward, and the seat 2 moves backward (or slides obliquely rearward) while descending with almost no change in the posture in side view. As shown in FIG. 2B, a lumbar support portion 3a that is curved in a forward convex shape in a side view is formed at the lower portion of the backrest 3, and when the seat 2 moves downward , the lumbar support portion 3a of the backrest 3 is It moves forward greatly by the interlocking mechanism. Although the member which comprises an interlocking mechanism is incorporated in the receiving member 17, since it has no special relationship with this invention, description is abbreviate | omitted.

When a person stands from the chair , the seat 2 is raised to its original position by a return spring 19 (see FIG. 4), and the return spring 19 is built in the lower portion of the front support link 7. . The backrest 3 of the present embodiment is made of a highly flexible material such as an elastomer and does not include a cushion. Of course, a cushion with a cushion on the front surface of the resin plate can also be used.

  Next, an outline of the internal structure of the support base 5 will be described. As described above, the support base 5 is formed in a box shape opened upward. As shown in FIG. 7A, the support base 5 has a bottom plate of the support base 5 and a part of the support base 5 at the inside and the rear part thereof. The reinforcing bracket 21 is fixed by welding or the like with a space between them, the bush 22 is fixed to the bottom plate of the support base 5 and the reinforcing bracket 21, and the upper end portion of the leg column 4 is fitted to the bush 22. ing.

A push valve 23 for releasing the lock as a gas cylinder protrudes upward from the upper end surface of the leg column 4. The gas cylinder is both comprise an inner and outer cylinder barrel expands and contracts as a whole by sliding in the axial direction, and a case where the inner cylinder and when forming the outer tube and movable form and movable .

As shown in FIG. 3 and FIG. 7 (A), a rectangular hole 24 having a side view for fitting the first support shaft 8 slidably in the front-rear direction in the front part of the left and right side plates 5a of the support base 5. Is vacant. As shown in FIG. 3, a resin guide bush 25 is mounted in the long hole 24. As shown in FIG. 4, the first support shaft 8 is slidably fitted to the guide bush 25 via a bearing slider 26, and the front support link 7 is rotatably connected to the slider 26 . .

  By the way, in general, the long hole 24 is often left open outward, and thus the entire support base 5 is covered with a cover in order to prevent injury and improve aesthetics. There is a problem that increases. On the other hand, as shown by the alternate long and short dash line in FIG. 4, if the slider 26 is formed with a flange 26 a that always closes the long hole 24 from the outside, the long hole 24 is formed on the outside. Therefore, there is an advantage that the cover that covers the support base 5 from below is eliminated and the cover can be downsized.

As shown in FIG. 4, two left and right locking springs (compression coil springs) 26 ′ are arranged in parallel inside the support base 5 as an example of the locking spring means so as to expand and contract in the front-rear direction. A front spring receiver 27 is fitted to the first shaft 8 from the rear.

The locking spring 26 ' is supported by a rear spring receiver 28 from the rear. The rear spring receiver 28 includes a fixed member and a movable member, and the fixed member is supported by a front wall 21 a formed on the reinforcing bracket 21. An operation shaft 29 shown in FIG. 4 passes through the movable member of the rear spring receiver 28, and a knob 29 a shown in FIG. 2A is attached to the tip of the operation shaft 29. When the knob 29a is rotated, the movable member of the rear spring receiver 28 moves back and forth, and the initial elastic force of the locking spring 26 ' changes.

As shown in FIG. 3, the front wall 21 a of the reinforcing bracket 21 in the support base 5 is higher than the horizontal portion to which the leg support 4 is fixed. This is because the vertical dimension of the rear spring receiver 28 is large.

As described above, when a person is seated, the seat 2 descends while retreating, and the lumbar support portion 3a of the backrest 3 moves forward in conjunction with this. When the seated person leans against the backrest 3, the first support shaft 8 slides while contracting and deforming the locking spring 26, thereby allowing the rocking frame 11 to tilt backward (backward tilting of the backrest 3). The

The first support shaft 8 and the swing frame 11, as shown in FIG. 6, is relatively pivotably connected through the interlocking member 30 and the interlocking shaft 31. That is, as shown in FIG. 4, the interlocking member 30 is disposed on the left and right sides of the inside of the support base 5, and its front end portion penetrates the first support shaft 8. An interlocking shaft 31 passes through the rear end, and as shown in FIG. 5, both left and right ends of the interlocking shaft 31 are fitted in bearing portions 32 formed on the left and right swing frame 11. Bearing portion 32 is located slightly in front of the drive shaft 18. As shown in FIG. 6 (A), the left and right interlocking members 30 are connected by a reinforcing stay 30a (the whole can be integrated with a metal plate).

By connecting the first support shaft 8 and the swing frame 11 by the interlocking member 30 and the interlocking shaft 31, it is ensured that the seat 2 and the backrest 3 tilt together during locking. Further, since the rear portion of the seat 2 tends to be relatively lifted (pushed up) when the backrest 3 is tilted backward, a so-called shirt turn (or back misalignment) is caused by the backrest 3 and the seat 2 being separated during locking. This phenomenon can be remarkably suppressed. The interlocking shaft 31 is arranged to move up and down above the rear portion of the support base 5, and the backrest 3 is locked by stopping or suppressing the movement of the interlocking shaft 31. Therefore , in this embodiment , the interlocking shaft 31 is an intermediate member described in claim 2 .

  As shown in FIG. 2 (B), the leg strut 4 is unlocked on the left side of the seat 2 and the front and rear intermediate portion of the seat outer shell 6 constituting the seat 2 with reference to the seated person. A seat lever 33 as an example of a seat operating tool is mounted around the longitudinal longitudinal pivot axis so as to be pivotable.

Similarly, in the seat outer shell 6 constituting the seat 2, the lumbar support portion 3a of the backrest 3 moves forward and forward on the left side portion and the rear end portion of the seat 2 with respect to the seated person as a reference. A lumbar lock lever 34 for switching to a non-operating state is arranged, and a portion of the seat outer shell 6 opposite to the lumbar lock lever 34 is provided with a back lever 35 (FIG. 2A) as an example of a back operation tool. )) Is arranged. The lumbar lock lever 34 and the back lever 35 are attached so as to rotate around the axis of the rear pin 16 which is a rotation support shaft of the rear support link 14 (details will be described later).

Although details will be described later, in the present embodiment, the back lever 35 is switched to three postures. When the posture of the back lever 35 is switched , the downward movement of the interlocking shaft 31 is stopped. It is suppressed . As a result, the backrest 3 has an all-free state in which it can tilt freely, a semi-free state in which it can freely tilt in the range of about half the maximum rearward tilt angle from the neutral state, and a lock that is held in a non-reclinable state in the neutral state. It is switched to three modes with state. On the other hand, when the seat lever 33 is raised, the lock of the leg column 4 is released, and when the finger is released from the seat lever 33, the seat lever 33 returns to the original state and the leg column 4 is locked.

(2). Outline of lifting / locking locking device / locking locking device
As shown in FIG. 8, inside the support base 5, an elevating lock device 37 that pushes down the push valve of the leg column 4 by the rotation of the seat lever 33, and the interlocking shaft 31 by the rotation operation of the back lever 35. A locking device 38 is disposed to stop or suppress the movement of the device . Next, the lifting lock device 37 and the locking device 38 will be described with reference to FIG . Previously not a, an outline on the basis of FIG. 7 (B) ~ 10. FIG.

Figure 7 (B) is a perspective view of the operating portion base material 39 is shared and lifting the locking device 37 and locking the locking device 38 from behind, FIG. 8 is exploded perspective view of the entire component, Figure 9 is the overall FIG. 10 is a plan view showing a state in which most of the members are incorporated.

The elevating lock device 37 and the locking lock device 38 have an operation portion base material 39 as a common member. The operation base member 39 is made of synthetic resin, and is disposed so as to spread over a wide range of the reinforcing bracket 21 in the support base 5 excluding the front wall 21a, as shown in FIGS. More precisely, the operation base member 39 includes a base 40 that overlaps the reinforcing bracket 21, and the base 40 is fixed to the reinforcing bracket 21 with three screws 41. The lateral width dimension of the base portion 40 is slightly smaller than that of the reinforcing bracket 21.

For example, as shown in FIGS. 8 and 9, the lift lock device 37 includes a lever-like pressing member 42 that presses down the push valve 23 of the leg column 4. It is rotatably attached to a first holding part 43 formed in the part. A space 44 for exposing the push valve 23 of the leg column 4 is vacant on the front side of the first holding portion 43 in the base portion 41 of the operation portion base material 39. Further, the front side of the cavity 44 of the base portion 41 of the support base 5, the first holding portion 46 for engaging an end portion of the seat wire 45 is fitted waited loci tube 45a is formed.

The locking device 38 includes a locking body 47 that is U-shaped in a plan view and overlaps the base 40 of the operation unit base member 39 from above, and a first slider that has an upward opening box shape that is disposed on the left side of the center line in a front view. 48, a second slider 49 fitted inside the first slider 48, a first spring 50 that pushes the first slider 48 backward, and a second spring 51 that pushes the second slider 49 backward. The base portion 41 of the support base 5 is formed with an upwardly opened box-shaped second holding portion 52 into which the first slider 48 is slidably fitted from above.

As shown in FIG. 10, the second holding portion 52 extends forward beyond the front wall 21 a of the reinforcing bracket 21 and is inclined so as to become higher toward the front end so as not to interfere with the front wall 21 a ( (See FIG. 7B) . Further, the front end portion of the second holding portion 52, the second holding portion 54 for engaging an end portion of the locking tube 53a of locking wire 53 is fitted is formed. When the locking wire 53 is pulled, the lock body 47 is horizontally slid back and forth via both sliders 48 and 49, thereby making it impossible for the interlocking shaft 31 to descend or restricting the descending range.

In this embodiment, the locking body 47, the sliders 48 and 49, the springs 50 and 51, the second holding part 52, and the second holding part 54 constitute a locking lock device 38 .

(3) Details of Lift Lock Device Next, the structure and movement details of the lift lock device 37 will be described with reference to FIGS. 11 is a sectional view taken along line XI-XI in FIG. 10, FIG. 12A is a sectional view taken along line XIIA-XIIA in FIG. 11, and FIG. 11B is an enlarged sectional view taken along line BB in FIG. 13 is a cross-sectional view in an assembled state at the XIIA-XIIA position of FIG. 11, and FIG. 14 is a front cross-sectional view showing the mounting structure of the seat lever 33.

The pressing member 42 (see FIGS. 8 to 9) constituting the lifting lock device 37 is made of, for example, resin and is narrow in a front view, and has an upright portion and a rearward facing portion connected to a lower end thereof in a side view. It has a shape. The rear end of the rearward facing portion is slightly lowered, and a shaft portion 55 projecting left and right is projected from the rear end, and this shaft portion 55 is fitted into the first holding portion 43 of the support base 5 from the rear side. ing.

  As shown in FIGS. 11 and 12, the first holding portion 43 has a hollow shape opened up and down, and a pair of left and right ridges that hold the shaft portion 55 of the pressing member 42 upward so as not to be pulled out are included therein. And a lower surface portion 43b against which the shaft portion 55 of the pressing member 42 hits from above. A protrusion 43c for retaining is provided on the lower surface portion 43b. Needless to say, the shaft portion 55 of the pressing member 42 is set by being fitted to the first holding portion 43 from above and then shifted to the front.

A holder 57 having an engaging groove 57a is fixed to the end of the seat tube 45a, while the first hold portion 46 of the support base 5 is formed in a substantially bifurcated shape when viewed from the front. A thin piece 46a (see FIG. 11) that fits into the engaging groove 57a of the holder 57 in the seat tube 45a is formed in the portion 46. The first hold part 46 is constricted so that the opening is slightly narrowed when viewed from the front, and the holder 57 is fitted into the first hold part 46 by elastically deforming the first hold part 46.

As shown in FIG. 11, the ball 58 is integrally fixed to the end portion of the seat wire 45, while the cylindrical portion 59 into which the ball 58 is fitted is formed at the upper end of the pressing member 42. In the tubular portion 59, a slit 59a for passing the seat wire 45 is formed in an L shape in the horizontal direction and the vertical direction. For this reason, the ball 58 is not detached from the cylindrical portion 59. Incidentally, the push valve 23 of the leg support post 4 is urged upward by built-in spring. For this reason, the elevating lock device 37 does not require a spring.

In the present embodiment, the slot forming the first hold portion 46 has a shape that is long in the vertical direction, and thus the holder 57 can slide up and down. Further, for example, as shown in FIG. 10, a screw 60 for screwing the holder 57 is screwed into the upper surface of the first hold portion 46.

As shown in FIG. 14, the seat lever 33 is attached to the seat outer shell 6. That is, by forming a pair of front and rear shaft portions 33a at the upper end of the seat lever 33, which is fitted to the shaft portion 33a from above the bearing portion 61 formed inside the seat outer shell 6. For this reason, the seat lever 33 can be rotated in a front view around its upper end. The bearing portion 61 is formed on a rib 62 formed on the seat outer shell 6, and two ribs 62 are arranged on the front and rear.

  The front and rear ribs 62 are integrally connected by a bottom plate 63. For this reason, the ribs 62 and the bottom plate 63 constitute a pocket portion 64. A holder 57 fixed to the other end of the seating tube 45a is fitted into a support piece 65 protruding from the bottom plate 63. The ball 58 fixed to the other end of the seat wire 45 is fitted into a cylindrical portion 66 formed on the seat lever 33. The cylindrical portion 66 is also formed with an L-shaped slit 66a for allowing the wire 45 to pass therethrough. The support piece 65 has a bifurcated shape, and the pocket portion 64 has a hole 67 for pulling out the seat tube 45a.

Although not required dare description, a person sitting is Ru is upward pull rotated over the fingers on the seat lever 33, the pressing member 42 by a tension of the seat wire 45 is rotated to fall forward, this As a result, the push valve 23 of the leg column 4 is pushed down and the lock is released. When adjusting the height of the seat 2, the seat lever 33 is operated in a state where the palm is placed on the seat 2, but when the seat lever 33 is attached to the seat outer shell 6 as in the present embodiment, the seat lever 33 is operated. It is extremely easy to operate with the palm of 2 on the edge.

(4) Details of Locking Lock Device Next, details of the locking lock device 38 will be described with reference to FIGS. 15 and 16A in addition to the previous drawings. 15 is a sectional view taken along the line XV-XV in FIG. 10, and FIG. 16A is a sectional view in an assembled state at the position viewed in the line XV-XV in FIG.

As shown in FIG. 8, the locking device 38 includes a locking body 47 (see FIG. 8) having a forward-opening U-shape in plan view, and front and rear longitudinal receiving portions 69 are integrally formed at both ends of the left and right longitudinal connecting portions. In addition, a joint portion 70 is integrally formed at a portion that is biased to the left in a front view. The base portion 41 of the operation portion base member 39 is formed with a longitudinal support portion 71 on which the left and right receiving portions 69 of the lock body 47 are slidably mounted.

The receiving portion 69 of the lock body 47 has a high step portion 69a located on the front side and a low step portion 69b located behind the high step portion 69a, and is formed in two steps, which is understood from FIG. As can be done, when the lock body 47 is fully retracted, the interlocking shaft 31 hits the high step portion 69a so that the backrest 3 is completely locked, and when the lock body 47 is retracted halfway toward the front side, the interlocking shaft 31 is reached. Is lowered to a certain degree and hits the low step portion 69b, so that the rotational range of the backrest 3 is reduced to a semi-free state, and when the lock body 47 is advanced backward, the backrest 3 is in an all-free state, The rotation of the backrest 3 is restricted when 31 hits the support portion 71 of the operation portion base member 39. Further, as shown in FIG. 8, a guide piece 69 c is formed in the receiving portion 69 of the lock body 47 so as to overlap the inner surface of the support portion 71 in the operation portion base material 39.

As described above, the first slider 48 is fitted to the second holding portion 52 of the operation portion base material 39 so as to be slidable back and forth (see FIG. 8) . As shown in FIGS. 15 and 16, the rear portion of the second holding portion 52 is a void 72 that opens downward, while the rear end portion of the first slider 48 extends downward from the void 72. down piece 73 is formed integrally, the second holding portion 52, between the spring receiving portion 74 downwardly projecting and the downwardly piece 73 of the first slider 48, falling incapable to mounted the first spring 50 ing. Accordingly, the first slider 48 is always pushed backward by the first spring 50.

A leg 75 that extends rearward is integrally formed on the downward piece 73 of the first slider 48, and a cylindrical shaft portion 75a projects left and right at the rear end of the leg 75 (FIG. 8 ) . See also). On the other hand, the joint part 70 of the lock body 47 is a T-shaped space in plan view that opens forward and vertically so that the rear part of the foot 75 enters from above. To be precise, the joint portion 70 has left and right vertical grooves 70a into which the shaft portions 75a of the legs 75 are fitted. When the first slider 48 moves back and forth, the lock body 47 also slides back and forth. However, since the first slider 48 is inclined, the shaft portion 75a moves back and forth while moving up and down. Therefore, in order to ensure the engagement of the shaft portion 75a, the joint portion 70 is provided with left and right front walls 70b (see FIG. 15) .

As is clear from FIGS. 8, 15, and 16 , a second slider 49 is fitted into the first slider 48 (the second slider may be called an auxiliary slider). The second slider 49 is formed into a hollow shape that is upwardly opened, the left and right sides are formed projections 49a (see FIG. 8), the projection 49a is, the slits 76 formed in the first slider 48 (The fitting is performed by elastically deforming the first slider 48). For this reason, the second slider 49 is held by the first slider 48 so as not to drop off.

Further, as shown in FIGS. 8 , 15 and 16, a flange 49 b is formed at the front portion of the second slider 49, and the second spring 51 is mounted between the flange 49 b and the front wall 48 a of the first slider 48. It is built. Further, the front wall 48 a of the first slider 48 and the second slider 49 are formed with slits 77 and 78 into which one end of the locking wire 53 is fitted , and a ball 58 fixed to one end of the locking wire 53. Is fitted inside the second slider 49. Further, the second hold portion 54 of the operation portion base material 39 has a groove shape with an upward opening so that the holder 57 fixed to the end portion of the locking tube 53a can be fitted against the elasticity from above (structure). Is the same as the first hold unit 46).

Both sliders 48 and 49 can be held in the fully advanced state. In this state, the lock body 47 is moving forward, and the interlocking shaft 31 can be lowered to the lower limit as described above . Therefore, in this state, the backrest 3 is in an all-free state in which it can tilt to the maximum stroke. Further, the maximum backward tilt angle of the backrest 3 is regulated by the interlocking shaft 31 that is an intermediate member hitting the support portion 71 of the operation portion base material 39. In other words, the operation portion base material 39 also serves as a stopper for the interlocking shaft 31.

When the first slider 48 is retracted in front it is pulled by the first spring 50, the locking member 47 also retracts the front. In this case, the first slider 48 is selectively held in two states, a state in which the first slider 48 is partially retracted and a state in which the first slider 48 is completely retracted. In the state of being retracted halfway, the lower step portion 69b of the receiving portion 69 of the lock body 47 is positioned below the interlocking shaft 31, and therefore the backrest 3 can be tilted backward from the neutral state within about half the stroke. It is in a semi-free state.

On the other hand, in a state where the first slider 48 is fully retracted to the near side, the high step portion 69b of the receiving portion 69 in the lock body 47 is located below the interlocking shaft 31, so that the backrest 3 is in the neutral state. It is in a completely locked state that cannot be tilted backwards.

  For example, the back lever 35 may be operated in a completely locked state. In this case, only the first slider 48 and the first spring 50 are present. For example, the interlocking shaft 31 is lowered and the lock body 47 is moved. Since the first slider 48 does not move in an incapable state, the back lever 35 does not move even if the back lever 35 is to be operated. This may cause the user to be mistaken for a malfunction or to make the user feel uncomfortable. There is a fear.

  On the other hand, when the second slider 49 and the second spring 51 are provided as in the present embodiment, for example, even if the back lever 35 is operated with the first slider 48 fully or partially retracted, When the second slider 49 moves forward against the second spring 51, the movement of the back lever 35 is allowed, and when the interlocking shaft 31 is detached from the lock body 47, the second slider 49 is moved by the second spring 51. At the same time, the first slider 48 moves forward against the first spring 50 and shifts to the set position. For this reason, it is possible to prevent an accident that gives a person a sense of incongruity, or forcibly turns the back lever 35 to cause damage. The second spring 51 has a stronger spring force than the first spring 50 because of its function.

(5). Mounting structure of the back lever The back lever 35 needs to be held in three positions. With this point as the center, the attachment structure of the back lever 35 will be described with reference to FIGS. 16B is a side view of the rear portion of the seat outer shell 6 of the back lever 35, FIG. 17A is a longitudinal side view of the main portion, and FIG. 16B is a view of the back lever 35 and the arm body 79. 18A is a partial plan view of the seat outer shell 6, FIG. 18B is a sectional view taken along the line BB of FIG. 19A, and FIG. FIG. 17A is a cross-sectional view taken along the line XIX-XIX in FIG. 17A in a omitted state, and FIG. 17B is a partial cross-sectional view taken along the line XIX-XIX in FIG.

  In the present embodiment, as shown in FIG. 17 (A), the unevenness in which the arm body 79 is incorporated in the back lever 35 and the resin stopper 80 attached to the arm body 79 is formed on the seat outer shell 6. The back lever 35 is selectively held in three postures by fitting into the portion 81 and changing the fitting position between the stopper 80 and the concavo-convex portion 81. Details will be described below.

  As described above, the upper portion of the rear support link 14 is connected to the rear bearing portion 15 of the seat outer shell 6 by the rear pin 16. As shown in FIG. 19A, the rear bearing portion 15 is a left and right pair, and the upper portion of the rear support link 14 is disposed between the left and right bearing portions 15. In this embodiment, the rear pin 16 is replaced with a socket bolt, and a resin bush 82 is fitted to the rear pin 16 so as not to rotate. In addition, the rear-side rear bearing portion 15 has a bag shape opened upward, and a rear pin 16 is screwed into a nut 83 fitted therein.

  The back lever 35 is disposed outside the outer rear bearing portion 15 and is rotatably fitted to the bush 82. Further, the back lever 35 is formed with a recess 84 into which the head 16a of the rear pin 16 enters.

The back lever 35 is made of synthetic resin and has a cylindrical portion 35a that fits into the bush 82 and a finger hook portion 32b that protrudes from the cylindrical portion 35a. A cutout portion 85 that is opened up and down is formed in the back side portion of the cylindrical portion 35 a of the back lever 35, and a vertically long arm body 79 is fitted into the cutout portion 85. The arm member 79 are also fitted over the bushing 82, and the arm body 79, the relative posture of the back lever 35 by the notch 82 of the back lever 35 is held together. Therefore, the back lever 35 and the arm body 79 can rotate integrally around the axis of the rear pin 16. The arm body 79 can be integrally formed with the back lever 35.

As shown in FIGS. 16 and 17, a portion of the seat outer shell 6 that overlaps the arm body 79 in a plan view is formed with an inverted mountain-shaped recess 86 that opens upward and protrudes downward. Has a through hole 87 into which the arm body 79 is fitted . A holding portion 88 into which a ball 58 fixed to the other end of the locking wire 53 is fitted is formed at the upper end portion of the arm body 79. The holding portion 88, a groove 88a for passing the wire 53 is formed.

As shown in FIGS. 17 and 18, a support piece 89 is formed on the upper surface of the seat outer shell 6 to engage the holder 57 fixed to the end of the locking tube 53 a. The support piece 89 is bifurcated. Although not shown, the seat outer shell 6 has a hole for pulling out the locking tube 53a downward.

As Figure 17, the portion that enters the recess 86 of the inner seat outer shell 6 of the arm body 79, a hollow portion 90 which opens to the left and right are formed, the stopper 80 is impossible deviation described above to the hollow portion 90 It is attached to. Further, a chevron-shaped engaging projection 80a is formed on the lower surface of the stopper 80, while three engaging engagements 80a of the stopper 80 are selectively fitted on the bottom surface of the recess 86 in the seat outer shell 6. groove 81a is formed, thereby, before Symbol uneven portion 81 is formed. The uneven portions 81 are formed on both the left and right sides with the through hole 87 interposed therebetween.

  Note that the engagement protrusion 80 a of the stopper 80 is also fitted to the bottom surface of the hollow portion 90 in the arm body 79, so that the stopper 80 rotates integrally with the arm body 79.

As can be understood from the above description, when the back lever 35 is rotated, the engagement protrusion 80a of the stopper 80 is selectively fitted into any of the engagement grooves 81 in the concavo-convex portion 81, whereby the back lever 35 is selectively held in one of the attitude of the three, so that the first slider 48 and the locking member 47 is also held in the selected択的to one of three positions. The engaging protrusion 80a of the stopper 80 is fit as invited to one of the engaging grooves 81a by deformation of against the elasticity. That is, the back lever 35 can be rotated with a click feeling. For this reason, the user can grasp the position of the posture of the back lever 35 with the fingertip.

  Various configurations can be adopted as a method of selectively holding the posture of the back lever 35. For example, a plurality of pieces along the circumferential direction are provided on the outer peripheral surface of the fixed shaft on which the back lever 35 is fitted. While forming the dent, it is also possible to fit a protrusion made on the leaf spring into the recess of the fixed shaft by fitting a stopper made of a leaf spring into the back lever 35 so as not to be relatively rotatable. However, in this case, the number of members increases, the configuration becomes complicated, and assembly is troublesome.

On the other hand, when the concave and convex portion 81 is formed on the seat outer shell 6 as in the present embodiment, the structure can be simplified because the other member is not required, and the arm body 79 is recessed. Assembling is easy because it is sufficient to fit into 86 from above. The mounting structure of the lumbar lock lever 34 is the same as described above. However, since the lumbar lock lever 34 is a two-step operation of ON / OFF, only two engagement grooves 81a of the concavo-convex portion 81 are formed . ).

The lever mounting structure of the present embodiment can be applied to mounting various levers (the mounting location is not limited to the location of the pin, but can be provided at any location of the seat outer shell 6, and the uneven portion is the seat outer shell. 6 can also be formed on the upper surface of 6). Further, the engagement protrusion 80 a can be integrally formed with the arm body 79. Further, the engaging means formed by a combination of the engaging portion provided on the seat outer shell 6 and the engaging portion provided on the arm body 79 may have another structure .

(6). Others The embodiment of the present application can be variously embodied in addition to the above-described embodiment. For example, the pressing member depressing a push valve leg struts can be employed, such as limited Razz, sliding or lever type the lever type. Further, the locking means for restricting the movement of the backrest is not limited to the embodiment .

Operation unit base member is than suffices I comprises an integral form as a whole, therefore, may have a structure fixed with screws or the like a plurality of members.

1 is an overall perspective view of a chair. (A) is a front view of a chair, (B) is a side view of a chair. It is a partially broken isolation | separation side view which shows the support means of a seat. FIG. 4 is a separated plan view taken along the line IV-IV in FIG. 3. It is a perspective view of a rocking | fluctuation frame. (A) is a perspective view of an interlocking member, (B) is a partial sectional side view showing a connected state of the interlocking member and a swing frame. (A) is a perspective view of a support base, (B) is a perspective view of an operation part base material. Is an exploded perspective view of the overall components of the lifting locking device and Rockingham grayed locking device. A separation plan view of the whole of the whole of the components of the lifting locking device and Rockingham grayed locking device. Is a plan view of a state incorporating the whole of lifting the locking devices and Rockingham grayed locking device. 11 is a sectional view taken along line XI-XI in FIG. 11A is a cross-sectional view taken along the line XIIA-XIIA of FIG. 11, and FIG. 11B is an enlarged cross-sectional view taken along the line BB of FIG. It is sectional drawing in the assembly state in the XIIA-XIIA viewing location of FIG. It is a front sectional view which shows the attachment structure of the lever for seats. FIG. 11 is a sectional view taken along line XV-XV in FIG. 10. (A) is sectional drawing in the assembly state in the XV-XV view location of FIG. 10, (B) is a side view of the rear part of the seat outer shell of a back lever. (A) is a vertical side view of the main part, and (B) is an exploded perspective view of a back lever and an arm body. (A) is a partial top view of the seat outer shell 6, (B) is a BB view sectional view of (A). 17A is a cross-sectional view taken along line XIX-XIX in FIG. 17A with some members omitted, and FIG. 17B is a partial cross-sectional view taken along line XIX-XIX in FIG. 17A with all members displayed. FIG.

2 seats 3 backrest 4 leg support (gas cylinder)
5 Support Base 6 Seat Outer Shell 21 Support Base Reinforcement Bracket 26 Locking Spring 30 Seat Lever
31 Interlocking shaft as intermediate member
33 Lever for sitting as an example of operating tool for sitting
35 Back lever as an example of back operation tool 37 Lift lock device (mechanism )
38 Locking lock device (mechanism)
39 Operation Unit Base Material 42 Pressing Member Constructing Lift Lock Device 45 Seat Wire
First slider constituting the locking member 48 locking the locking device forming the 45a seat tube 46, 54 hold device 47 locking the locking device
49 Second slider 50, 51 constituting the locking device, spring 53 locking wire
53a Locking tube

Claims (2)

A gas cylinder as a leg column; a support base fixed to the upper end of the gas cylinder; a seat disposed above the support base; and a backrest connected to the base or the seat so as to be able to tilt backward. and spring means for supporting the tilting after the back elastically, and the pressing member seated person is operated to operate the seat for operation tool depressing push valve of the gas cylinder, seated people back manipulation tool A lock body that is actuated when operated to stop or suppress tilting of the backrest,
Wherein the pressing member and the locking member, a structure provided for the operating portion base member integral attached to said support base,
The lock body is slidably mounted on the operating portion base member, and the tilt of the backrest is controlled by the lock body sliding and changing its position. The operation is performed by a locking wire that is pulled by the back operation tool, and a holding portion that holds an end portion of a tube in which the locking wire is fitted is provided on the operation portion base material. While
The pressing member is actuated by a seat wire that is pulled by operating the seat operating tool, and holds the end portion of the tube in which the seat wire is fitted to the operation unit base material. A hold unit is provided.
Chair. The support base is linked to the rear tilting swing frame extending behind, with attached previous SL backrest to the swing frame, the swing frame is above the support base and it provided arranged intermediate member, hand the tilting is prevented after the swing frame by the intermediate member strikes the locking member,
The pressing member is pivotable and formed in a lever shape, and the pressing member is rotatably attached to the operation portion base material .
The chair according to claim 1.

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