JP6141621B2 - Spring unit for chair - Google Patents

Description

  The present invention relates to a spring unit used for locking a chair or the like.

In a rocking chair in which the backrest tilts backward, the backward tilting of the backrest is elastically supported by spring means. For example, a torsion bar or rubber may be used as the spring means, but generally a coil spring is often used, and the coil spring is supported by a pair of spring receivers. On the other hand, on the one hand the stationary one of the pair of spring bearing has become movable, if for locking, that the spring receiver of the rear tilt Then movable backrest moves toward the receiving stationary spring, locking Reaction force against is given.

What is important about the coil spring for locking is that a pre-tension (preliminary load) is applied to the coil spring even in a neutral state (or a free state) where the person is not resting on the backrest. That is, although the coil spring shrunk and deformed in proportion to the load, because the large moment caused by consuming rest of the seated person is applied to the coil spring, the coil spring begins to deform from the unloaded state, the backrest in the initial leaning A phenomenon of suddenly rearward tilting occurs, and pre-tension is applied to the coil spring in order to prevent this and apply an appropriate reaction force from the initial stage of the stagnation.

  However, in assembling the chair, it is troublesome to set the coil spring at a predetermined position in a compressed state, and if the procedure is mistaken, the coil spring may pop out due to the repulsive force.

Therefore, it away as not to hold a pair of spring bearing in a state of hanging the pre pretension the coil spring, i.e., it has been proposed to units the coil spring and a pair of spring bearing. As an example, Patent Document 1 describes that a pair of spring receivers are connected by a center shaft and a bolt. That is, in Patent Document 1, the center shaft is inserted into the two spring receivers so as to be relatively movable, but one end of the center shaft is held so as not to be detachable from one spring receiver, and the other end is a bolt. Thus it is held so as not to escape into the receiving other spring.

Japanese Patent No. 3370132

Although Patent Document 1 exhibits a function as a spring unit, since a center shaft and a bolt (and a washer as a flange) are required in addition to two spring receivers, member management at a stage before the spring unit is configured. to not there is a problem that the time-consuming only, cost is also undeniable that increase.

  The center shaft is inserted into one spring receiver from the outside (opposite to the coil spring), and the bolt is inserted into the other spring receiver from the outside (opposite to the coil spring). There is also a problem that the shape is regulated. In addition, since the bolts must be screwed one by one when assembling the spring unit, it takes time to assemble the spring unit. In addition, if dirt is clogged between the center shaft and the spring receiver, the movement may be deteriorated.

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

Spring unit of the present invention comprises a pair of spring bearing, said has a pair of spring receiving coil spring disposed between the pair of spring bearing a relative movement in the axial direction of the coil spring The basic configuration is such that the coil springs are connected in a state where they can be separated and are pre-tensioned , and the pair of spring receivers are always urged away from each other.

And in invention of Claim 1,
One of the pair of spring receivers is provided with a rod extending toward the other spring receiver in a state where the coil spring is fitted so that the rod can rotate integrally with the one spring receiver. And a non-circular engaging portion protruding outwardly from the tip end of the rod as viewed from the axial direction ,
The spring receiver other hand, to prevent the the one of the spring receiving rod circle hollow space fitted movably in the omission of the rod in use state are located in an end portion of the facing receiving one of the spring An end plate is formed,
The end plate is formed with a notch groove into which the engagement portion is fitted only when both spring receivers are in a predetermined relative posture that is not in use. In the state in which the two spring receivers are relatively rotated to the posture in use after being fitted into the two, the engaging portions are held so as not to be detached by the end plates, and the two spring receivers are connected so as not to be separated.

  According to a second aspect of the present invention, in the first aspect, a pair of engaging portions of the rod in the one spring receiver are provided so as to protrude on both sides of the shaft center. According to a third aspect of the present invention, in the second aspect of the present invention, the engagement portion has a flange portion facing the base of the rod, while the inner surface of the end plate of the other spring receiver is A fitting groove for holding both spring receivers in a fully extended state so as not to be relatively rotatable is formed by fitting the flange portion of the engaging portion.

In the present invention, since the constituent elements of the spring unit need only be a coil spring and a pair of spring receivers, it is possible to reduce the labor required for member management before assembly and to reduce costs. Further, when assembling the spring unit, it is only necessary to fit the coil springs together while compressing them with the two spring receivers and rotate them relative to each other. Therefore, the spring unit can be assembled very easily.

Further, the engaging portion provided on one of the rod is moved a hollow hole provided in the interior of the receiving other spring, the hollow hole of the other spring bearing becomes large space to allow the rotation of the engagement portion Therefore, there is no clogging of dust between the engaging portion and the rod and the other spring receiver, so that the smooth expansion and contraction movement of both spring units can be ensured.

The engaging portion provided at the tip of the rod can be formed in a form protruding only in one direction or in a state protruding in three or four directions, but if it protrudes only in one direction, the engaging portion Since the spring receiver is in a single-contact state, the cores of both spring receivers may be displaced. On the other hand, when projecting in three or four directions, the relative rotation angle becomes small when the two spring receivers are relatively rotated and held in a state where the engaging portion is not pulled out, so that the stability of holding the pin in a state where it is not pulled out may be deteriorated. There is.

  On the other hand, if the structure of Claim 2 is employ | adopted, since an engaging part is located in the both sides on both sides of an axial center, both spring receivers are hold | maintained in the state of concentricity, and stability is high. Can be relatively rotated by about 90 degrees, so that it is possible to secure a function of preventing the removal.

Further, when the structure of claim 3 is adopted, the state in which the flange portion of the engaging portion is fitted in the fitting groove of the other spring receiver is maintained by the repulsive force of the coil spring in the maximum extension state of the spring unit. in storage and transportation prior to incorporation into the chair, even if external force is applied to rotate relative to this receiving spring for reasons such as vibration, receiving both springs the state of the spring unit without relative rotation is maintained. For this reason, the handling effort at the time of conveyance and storage can be reduced.

It is a perspective view of the chair which concerns on embodiment, (A) is the whole perspective view of the state which fell down the seat, (B) is the whole perspective view in the state which flipped up the seat, (C) is a partial backrest FIG. (A) is a perspective view of the state which isolate | separated the seat, (B) is a perspective view of a seat receiving part. It is a separation perspective view in the state where a seat was omitted. It is a separation perspective view showing a locking mechanism. (A) is a partially separated perspective view of a seat part, (B) is a figure which shows the relationship between a slider and a support stay, (C) is CC sectional view taken on the line of (B). It is a partially separated perspective view which shows the support mechanism of a seat. (A) is a separated perspective view showing the relationship between the movable base, the slider and the spring unit, (B) is a separated perspective view of the rear spring receiver and the movable base, and (C) is a perspective view of the rear spring receiver. . (A) is a separated perspective view of the spring unit, (B) is a perspective view in the middle of fitting the front and rear spring receivers (the spring is omitted), and (C) is a state in the middle of unitizing by setting the spring It is a perspective view. (A) is A-A Mitaira sectional view shown in FIG. 8 (C) in a state in which a unit, (B) is a rear spring bearing at arrow B-out partially cut viewed from the viewing direction a perspective view of (A) is there.

(1). Summary of the implementation forms will be described with reference to the embodiment of the present invention with reference to the drawings. First, an outline of the chair will be described mainly with reference to FIGS. In the following description, the words “front and rear” and “left and right” are used to specify the direction, but the front and rear and left and right are based on a state viewed from a person who normally sits on a chair. The front view direction is the direction facing the seated person.

As shown in FIG. 1, the chair includes a leg device 1, a seat 2, and a backrest 3 as large elements, and the seat 2 is attached to a movable base 4 that is flipped up and rotated. Therefore, the seat portion 5 is configured with the seat 2 and the movable base 4 as main elements. As shown in FIG. 1 (A), the seat 2 is made of resin seat plate (seat inner shell) 6, and a seat cushion material 7 stretched on the upper surface, the seat cushion member 7 such as a cross Covered with a skin material 8.

The leg device 1 is made of a metal pipe such as a steel pipe or an aluminum pipe, and has a four-leg system having left and right front legs 10 and rear legs 11. Casters 12 are attached to the front and rear legs. The upper end of the front legs 10, and on the side portion 14 is bent formed to extend rearwardly in an orientation that is slightly inclined forward with respect to the horizontal, the rear end of the upper side portions 14, against the upper end side portion of the rear foot 11 It is fixed by welding.

The front ends of the left and right upper side portions 14 are connected by a laterally long horizontal bar 15. The rear foot 11 is in a forward leaning posture in a side view so as to be shifted toward the front as it goes upward, and is gently curved. As shown in FIG. 1B, a recess 4a is formed on the lower surface of the movable base 4 in which the left and right intermediate portions of the horizontal bar 15 are fitted.

The upper end of the rear foot 11 is a support frame 19 that protrudes above the seat 2, and an upper support shaft 17 having an axial center that is horizontally horizontal is fixed to the upper end by welding. The backrest 3 is connected via an upper screw 18 so as to be able to tilt backward.

The left-right distance between the left and right hind legs 11 is larger than the left-right distance between the left and right front legs 10, so that the legs of the front and rear chairs can be fitted together (nested) with the seat portion 5 flipped up. It is possible. For example, as clearly shown in FIG. 3, a rubber stopper 20 is provided on the inner side surface of the rear foot 11 so that the front foot 10 of the rear chair can hit when the chair is nested. In addition, the form of the leg apparatus 1 can be set arbitrarily.

  For example, as shown in FIG. 3, the movable base 4 has a shallow box-shaped main body 21 that is square in plan view, and a square arm 22 that protrudes upward while spreading outward from the rear part of the main body 21. . The movable base 4 is a resin molded product (may be an aluminum die-cast product), and the square arm 22 is provided integrally with the main body 21. In addition, since the main-body part 21 is box-shaped, the outer periphery is comprised with the surrounding wall.

For example, as shown in FIG. 5, a boss portion (bearing portion) 23 protruding leftward and rightward is integrally provided at the upper end of the square arm 22, and this boss portion 23 is formed in the upper and lower middle portions of the support frame 19. The lower support shaft 24, the lower bush 25, and the lower screw 26 are rotatably connected. Therefore, the movable base 4, is rotated flipped about the axis 27 of the boss portion 23 can Rukoto, thereby, the seat 5 is thrown up as in FIG. 1 (B) ( (Folded) state. The head of the lower screw 26 is covered with a lower cap 28.

  As shown in FIG. 1 (C), the backrest 3 includes a backrest main body (main frame) 29 having a large opening in the front-rear direction, and a support body 30 attached to the backrest main body 29 so as to cover the opening. Yes. Although the back cushion material 31 is stretched on the front surface of the support body 30, the support body 30 may be left exposed without providing the back cushion material 31. The backrest body 29 and the support body 30 are resin molded products.

  As clearly shown in FIG. 5, an outward projecting portion 29 a projecting outward in the left and right directions is formed on the lower portion of the backrest body 29, and an outer end of the outward projecting portion 29 a is A bearing portion 32 that fits into the upper support shaft 17 is formed. A bush (not shown) is fitted to the bearing portion 32, and the backrest body 29 is held on the upper support shaft 17 so as not to be detached by screwing the upper screw 18 into the upper support shaft 17 from the inside. The head of the upper screw 18 is covered with an upper cap 33.

When the backrest 3 tilts backward, the seat 2 moves forward. Accordingly, the seat 2 is attached to the movable base 4 so as to be slidable back and forth. Specifically, as shown in FIGS. 2 to 4, a pair of left and right sliders 36 are mounted on the movable base 4 so as to be movable back and forth, and the seat plate 6 is mounted on the left and right sliders 36 so as not to move relative to the front and rear. . Therefore, the seat 2 relative movement with the slider 36. As shown in FIG. 4, the forward movement of the slider 36 is elastically supported by a coil spring 37. The coil spring 37 is supported by front and rear spring receivers 38, 39. The front spring receiver 38 is held by the movable base 4 so as not to move forward and backward, and the rear spring receiver 39 is pushed by the slider 36 and moves forward. .

Furthermore, as shown in FIG. 4, the rear end of the left and right support frame 19, the left and right horizontally elongated support stay 40 made of metal plates are fixed by screws 41, to the left and right ends of the support stay 40, an upward The passive arm 42 is bent . On the other hand, a pocket-shaped pushing part (holder part) 43 that fits on the passive arm 42 of the support stay 40 from above is provided at the lower end of the backrest body 29. A resin crown member 44 is attached to the upper end of the passive arm 42.

In the chair of the present embodiment, when the backrest 3 is locked by the seated person's leaning, the slider 36 moves forward via the support stay 40, whereby the seat 2 is interlocked (synchronized) with the locking of the backrest 3. Advance.

(2) Slide mechanism Next, the slide mechanism will be described mainly with reference to FIGS. 5 to 7 (coil springs are omitted in FIG. 6). As described above, the movable base 4 is provided with a pair of left and right sliders 36 to which the seat 2 is fixed.

For example as shown in Figure 6, the slider 36 is adapted to the groove type which opens downward in front and rear longitudinal, and the lower end of the right and left side plates 36a bent longitudinal flange 36b of the outward form. On the other hand, a pair of front and rear support protrusions 45 that the slider 36 covers are provided on the left and right side portions of the movable base 4, and a roller 46 that is arranged with the shaft center being horizontally long on the upper end of the support protrusion 45 can freely roll. It is inserted. The roller 46 is made of a resin having a small friction coefficient and excellent wear resistance, such as POM resin, and can slide the slider 36 back and forth lightly and silently.

The left-right displacement of the slider 36 is regulated by an outer guide wall 47 provided on the movable base 4 and front and rear inner guide protrusions 48. A guide stopper 49 is provided on the outer guide wall 47 and the front and rear inner guide protrusions 48 so as to be positioned on the front and rear flanges 36 b of the slider 36. Therefore, the slider 36 is back and forth slidably retained impossible upward movement. While there is a large space between the front and rear flanges 36b of the slider 36, there is also a large space between the front and rear guide stoppers 49.

Therefore, the slider 36 is attached by fitting the flange 36b on the front side between the front and rear guide stoppers 49 from above with the slider 36 shifted backward from a predetermined position, and then moving the slider 36 forward to move the flange 36 to the flange. The process is performed by positioning 36b below the guide stopper 49. A certain amount of space is provided between the flange 36b of the slider 36 and the bottom surface of the movable base 4. Therefore, the movable base 4 is provided with reinforcing ribs 9 adjacent to the flange 36b of the slider 36.

The coil spring 37 and the front and rear spring receivers 38 and 39 constitute a single unit, and the front spring receiver 38 cannot be displaced from front to back or left and right by the left and right holder pieces 50 provided on the rear surface of the support protrusion 45 located on the front side. Is held in. That is, as clearly shown in FIG. 7, the front spring receiver 38 is sandwiched between the left and right holder pieces 50, and the rear end is in contact with the front support protrusion 45. while forming the notch 50a so as to be grooved between the support projections 45, the front spring bearing 38, and the full lateral projections 38a fitted from above is provided in the notch 50a, thereby, The rear spring receiver 39 is held so that it cannot be displaced in the left-right direction and the front-rear direction.

Moreover, as also best seen in Figure 7, the front spring bearing 38 forms a forward piece 38b which is a free end to the front end, the stopper claws 38d are provided at the front end of the forward piece 38c, the stopper pawl 38 d is fitted in the long groove 52 formed in the slider 36. The front end surface of the stopper claw 38d is in a vertical posture, and therefore, the retracted position of the slider 36 is restricted. Further, the rear surface of the stopper pawl 38d is an inclined surface 38e which becomes lower toward the rear, Therefore, in the set is shifted to the front of the slider 36 from behind, and forward piece 38c is bent once downward deformation Then return to deform. Thus, enabling the mounting of the slider 36 easily.

On the other hand, as shown in FIGS. 6 and 7, a hanging piece 53 formed by cutting and raising the slider 36 is in contact with the rear spring receiver 39 from behind. The drooping piece 53 has a reverse T-shape in front view with a left and right outward projecting piece 53a provided at the lower end of the drooping piece 53. The regulation piece 39a is provided. For this reason, the slider 36 and the rear spring receiver 39 are held so as not to be rattled.

The rear spring receiver 39 corresponds to one of the spring receivers described in the claims, and a rod 39b that is fitted with a coil spring 37 and extends forward is integrally formed on the rear spring receiver 39. . The front spring receiver 38 corresponds to the other spring receiver described in the claims, and forms a hollow hole 54 into which the rod 39b is fitted. The rod 39b of the front spring receiver 39 is fitted in the hollow hole 54 of the front / rear spring receiver 38 so that it cannot be removed and can be moved relative to the front / rear.
The coil spring 37 is pre-compressed (pre-tension is applied) in a state where the front and rear spring receivers 38 and 39 are separated most (a state where the spring unit is most extended). Therefore, as described above, the front and rear spring receivers 38 and 39 and the coil spring 37 are a single unit, which is convenient for storage and assembly, and the assembly of the spring unit itself is also simple.

(3). Spring unit As shown in FIGS. 8 and 9, the front spring receiver 38 has a hollow hole (engagement hole) 54 that is long in the longitudinal direction. The hollow bore 54 is circular, as can be understood from FIG. 8 (C), the are open mouth in front. On the other hand, at the front end of the rod 39b in the rear spring receiver 39, a pair of engaging portions 39c projecting radially outward (radially) is integrally formed.

The rear end of the front portion spring receiving 38, is provided an end plate 38f such as to close the hollow bore 54, the end plate 38f, to form a full communication hole 55 fitting rod 39b is. And the communicating hole 55 has a pair of notch groove 55a in which the engaging part 39d of the rod 39c fits . Accordingly, in a state in which the engaging portion 39 is fitted to the notched groove 55a, since fitted a rod 39b to the communication hole 55 and the hollow hole 54, when the spring bearing 38, 39 before and after rotating 90 ° relative, longitudinal spring The receptacles 38 and 39 are held inseparable .

In this case, as shown in FIG. 9, the engaging portion 39d is formed in the shape of a bowl facing the base of the rod 39c, while the end plate 38f of the front spring receiver 38 has an engaging portion 39d. The fitting groove 56 into which the flange portion is fitted is formed . As a result, the front and rear spring receivers 38 and 39 are held in a relatively non-rotatable state by the elastic restoring force of the coil spring 37 in a state where no load is applied to both spring receivers 38 and 39. Thus, when assembled prior to storage and transportation, etc., rather than the Turkey disconnected spring bearing 38, 39 before and after the vibration or the like, can be suppressed labor of handling.
As can be understood from FIG. 9A, even when the coil spring 37 is fully contracted and the rear spring receiver 38 contacts the front spring receiver 38, the tip of the rod 39 b remains inside the hollow hole 54 of the rear spring receiver 38. Is held in the state.

As described above, the rear spring receiver 39 is provided with a regulating piece (regulating rib) 39a that sandwiches the hanging piece 53 (for example, FIG. 7) of the slider 36 from the left and right. For this reason, when the spring unit is incorporated in the chair , the rear spring receiver 39 is held so as not to rotate. Further, the restricting ribs 39a, forms a full notch 39e projecting piece 53a is fitted in the suspending piece 53, and thus, are vertically separated non holding the slider 36 and the rear spring bearing 39.

  Needless to say, when assembling the chair, the spring unit is first set on the movable base 4 and then the slider 36 is mounted. The seat plate 6 is attached to the slider 36 and the support stay 40.

  Although the chair of the above embodiment slides with the backrest rocking, the spring unit of the present invention can be applied to a chair in which the backrest only tilts backward, a chair in which the backrest and the seat move independently, and the like. . The spring unit can also be used for applications other than the elastic support of the backrest and seat.

In the present embodiment, the structure of attaching the front spring receiver 38 and the slider 36 to the base body such as the movable base 4 is also devised, and these can be an independent invention. That is, improvement of the structure for attaching the front spring support (fixed spring support) or the slider to the base body can be recognized as an issue, and the structure of the embodiment provides a special effect such as easy assembly while being inseparable. Demonstrate.

The present invention can be used to actually manufactured. Therefore, it can be used industrially.

2 seats 36 slider 37 coil spring 38 front spring receiver (the other spring receiver)
39 Rear spring support (one spring support)
39c rod 54 hole 39d engagement part 38f end plate
54 Hollow hole
55 communication hole
55a Notch groove 56 Fitting groove

Claims (3)

A pair of spring bearing, said has a pair of spring receiving coil spring disposed between the pair of spring bearing is connected to a state which does not separate capable of relative movement in the axial direction of the coil spring A pre-tension is applied to the coil spring, and the pair of spring receivers are always urged away from each other ,
One of the pair of spring receivers is provided with a rod extending toward the other spring receiver in a state where the coil spring is fitted so that the rod can rotate integrally with the one spring receiver. And a non-circular engaging portion protruding outwardly from the tip end of the rod as viewed from the axial direction ,
The spring receiver other hand, to prevent the the one of the spring receiving rod circle hollow space fitted movably in the omission of the rod in use state are located in an end portion of the facing receiving one of the spring An end plate is formed,
The end plate is formed with a notch groove into which the engagement portion is fitted only when both spring receivers are in a predetermined relative posture that is not in use. In a state in which the two spring receivers are relatively rotated to the posture in use after being fitted into the two, the engaging portions are held by the end plates so as not to be detached, and the two spring receivers are connected so as not to be separated.
Spring unit for chairs. A pair of engaging portions of the rod in the one spring receiver are provided so as to protrude on both sides of the shaft center,
The chair spring unit according to claim 1. The engaging portion has a flange portion directed in the direction of the base of the rod. On the other hand, the flange portion of the engagement portion is fitted into the inner surface of the end plate of the other spring receiver, whereby both springs are fitted. A fitting groove is formed to hold the receiver in a fully extended state so as not to be relatively rotatable.
The chair spring unit according to claim 2.

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