JP2014097177A - Chair spring unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair spring unit which is composed of a set of a coil spring having a pretension applied thereto and paired spring receivers, and which is suppressed in cost and simplified in assembly by reducing components.SOLUTION: A rod 39c formed at one spring receiver 39 enters the hole 54 of the other spring receiver 38. The rod 39c is equipped at its leading end with an outward engagement portion 39d, whereas the end plate 38f of the other spring receiver 39 is formed with a notched groove 55, through which the engagement portion 39d passes. When the two spring receivers 38 and 39 are relatively turned after the rod 39c was fitted, the two spring receivers 38 and 39 are held so as not to come off. The spring unit is constituted of only the essential elements, so that the trouble of the member management can be eliminated while simplifying the assembly.

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. One of the pair of spring receivers is fixed and the other is movable. In the case of locking, the movable spring receiver is moved toward the fixed spring receiver by tilting the backrest. 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) in which a person is not resting on the backrest. In other words, the coil spring shrinks and deforms in proportion to the load, but a large moment acting on the seated person's leaning acts on the coil spring. A phenomenon of large backward 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 has been proposed to hold the pair of spring receivers in a state in which the coil springs are pre-tensioned in advance, that is, to make the coil springs and the pair of spring receivers into a spring unit. 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 detached from one spring receiver, and the other end is bolted. The other spring support is held so as not to be detached.

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. This is not only a problem that takes time and effort, but also inevitably increases costs.

  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.

  The spring unit of the present invention includes a pair of spring receivers and a coil spring disposed between the spring receivers. The pair of spring receivers are connected so as to be relatively movable in the axial direction of the coil spring, and a pretension is applied to the coil spring.

  In the invention of claim 1, one of the pair of spring receivers has a rod extending toward the other spring receiver, and the rod of the one spring receiver is fitted into the other spring receiver. A round hole is formed, and a non-circular engaging portion is projected outwardly from the tip end of the rod of the one spring receiver as viewed from the axial direction. The portion facing the one spring receiver is an end plate through which the rod penetrates, and a notch groove into which the engaging portion is fitted only when both spring receivers are in a predetermined relative posture is provided on this end plate. Then, by inserting the engaging portion into the other spring receiver and then rotating both spring receivers relative to each other, the engaging portion is held so as not to be detached from the other spring receiver.

  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 save time and labor required for member management prior to 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 in one rod moves through a hole provided in the other spring receiver, but the hole in the other spring receiver is a large space to allow rotation of the engaging portion. Therefore, dust is not clogged 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 engagement portion provided at the tip of the rod can be formed in a form protruding only in one direction, or in a protruding state in three or four directions, but if it protrudes only in one direction, the engagement portion is the other spring. Since the support 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. Even if an external force that relatively rotates the spring receiver acts on the spring receiver for storage or transportation before being incorporated into the chair, the spring unit is maintained in the state without rotating both spring receivers. 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. The 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 (spring is omitted), and (C) is a state in which the springs are set and the front and rear spring receivers are separated. FIG. (A) is an AA plan sectional view of FIG. 8 (C) in an assembled state, and (B) is a partially cutaway perspective view of the rear spring receiver as viewed from the direction of arrow B of (A). .

(1). Outline of First Embodiment Next, an embodiment of the present invention will be described 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. 1A, the seat 2 includes a resin seat plate (seat inner shell) 6 and a seat cushion material 7 stretched on the upper surface thereof. Covered with 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 left and right rear legs 11. Casters 12 are attached to the front and rear legs. At the upper end of the front foot 10, an upper side portion 14 extending rearward in a posture slightly tilted forward with respect to the horizontal is formed by bending, and the rear end of the upper side portion 14 is butted against a portion near the upper end of the rear foot 11 and welded. It is fixed with.

  The front ends of the left and right upper side portions 14 are connected by a laterally long horizontal hook 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 curved with a gentle curvature. 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, and a backrest is supported on the upper support shaft 17. 3 are 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 5 flipped up. It has become. 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 that protrudes left and right outward is integrally provided at the upper end of the square arm 22, and this boss portion 23 is provided below the upper and lower middle portions of the support frame 19. The support shaft 24, the lower bush 25, and the lower screw 26 are rotatably connected. Therefore, the movable base 4 can be swung up and rotated around the axis 27 of the boss portion 23, whereby the seat portion 5 is flipped up (folded) as shown in FIG. A) 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. . Accordingly, the seat 2 moves relative to 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. .

  Further, as shown in FIG. 4, left and right horizontally long support stays 40 made of metal plates are fixed to the rear end portions of the left and right support frames 19 with screws 41, and passively facing upward at both left and right ends of the support stay 40. While the arm 42 is bent, a pocket-shaped pushing portion (holder portion) 43 is provided at the lower end portion of the backrest body 29 so as to be fitted to the passive arm 42 of the support stay 40 from above. 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 synchronized (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 FIGS. 6 and 7, the slider 36 has a groove shape that is open in the longitudinal direction and opens downward, and an outwardly extending front and rear flange 36 b is bent at the lower end of the left and right side plates 36 a. 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 acting horizontally is fitted to the upper end of the support protrusion 454 so as to be freely rotatable. I put it. The roller 46 is made of a resin having a small friction coefficient and excellent wear resistance such as POM resin, and the slider 36 can be slid 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. For this reason, the slider 36 is held so as to be slidable back and forth without being movable upward. 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 toward the flange 36b. Is carried out by a procedure in which the guide stopper 49 is positioned below. 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 the notch 51 is formed so that a groove is formed between the front spring receiver 38 and the front spring receiver 38, a lateral projection 38a that fits into the notch 51 from above is provided. It is held so that it cannot be displaced in the left-right direction and the front-back direction.

  Also, as clearly shown in FIG. 7, the front spring receiver 38 is formed with a forward piece 38b having a front end as a free end, and a stopper claw 38d is provided at the front end of the front piece 38c. Is inserted into a long groove 52 formed in the slider 36. The front end surface of the stopper claw 38d is in a vertical posture, and thus the retreat position of the slider 36 is restricted. Further, the rear surface of the stopper claw 38d is an inclined surface 38e that becomes lower as it goes rearward. For this reason, when the slider 36 is set shifted from the back to the front, the forward piece 38c is once bent downward and deformed. Return from and deform. Therefore, the slider 36 can be easily attached.

  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 which a left and right outward projecting piece 53a is provided at the lower end thereof, while the rear spring receiver 39 has left and right portions sandwiching a portion excluding the lower end of the drooping piece 53 from the left and right. A restricting piece 39a is provided. For this reason, the slider 36 and the rear spring receiver 39 are held so as not to be rattled.

  A rod 39b extending forward is formed integrally with the rear spring receiver 39, and the front and rear spring receivers 38, 39 are removed by fitting the tip of the rod 39b into an engagement hole 54 provided in the front / rear spring receiver 38. Inability to hold relative movement. 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 longitudinal engagement hole 54. The engagement hole 54 is circular and opens toward the front as can be understood from FIG. 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 are integrally formed.

  A bottom plate 38f is provided at the rear end of the front spring receiver 38. A pair of notch grooves 55 into which the engaging portion 39d of the rod 39c is fitted are formed in the bottom plate 38f, and the engaging portion 39 is formed. The front and rear spring receivers 38 and 39 are relatively rotated by 90 ° after being fitted into the notch groove 55, whereby the front and rear spring receivers 38 and 39 are held inseparable.

  In this case, as shown in FIG. 9, the engaging portion 39d is formed in a hook shape facing the base of the rod 39c, while the hook portion of the engaging portion 39d is fitted on the bottom plate 38f of the front spring receiver 38. By forming the full fitting groove 56, 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 with the spring unit fully extended. Therefore, during storage and transportation before assembly, the front and rear spring receivers 38 and 39 do not come off due to vibration or the like, and the handling is not troublesome.

  In addition, on the back surface of the rear spring receiver 39, as described above, 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 is provided. For this reason, the rear spring receiver 39 is held in a non-rotatable state with the spring unit incorporated in the chair. In addition, the regulating rib 39a is formed with a notch 39e into which the projecting piece 53a of the hanging piece 53 is fitted. Therefore, the slider 36 and the rear spring receiver 39 are held so as not to be separated vertically.

  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 body 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 actually manufactured and used. 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 55 Notch groove 56 Fitting groove

Claims (3)

A pair of spring receivers and a coil spring disposed between the spring receivers, and the pair of spring receivers are coupled to be movable relative to each other in the axial direction of the coil springs. A pretensioned configuration,
One of the pair of spring receivers has a rod extending toward the other spring receiver, and the other spring receiver has a hole into which the rod of the one spring receiver is fitted, On the tip of the rod of the spring receiver, a non-circular engaging portion is projected outwardly when viewed from the axial direction, while the portion of the other spring receiver that faces the one spring receiver is The rod is an end plate through which a notch groove into which the engaging portion is fitted only when both the spring receivers are in a predetermined relative posture is provided on the end plate, and the engaging portion is used as the other spring receiver. The engagement portion is held so as not to be disengaged from the other spring receiver by rotating both spring receivers relative to each other.
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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