JP2011244993A - Lock device for locking mechanism of chair and chair incorporating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock device for a locking mechanism of a chair in which supporting rigidity is strong, a lock member can be made thin and miniaturized, fitting and releasing of the lock member and an engaging grove can be made smooth, and installation afterward is possible.SOLUTION: In the lock device for the locking mechanism of the chair having a back support member rearwardly tiltably connected to a base member supported by legs fixing the back support member to the base member in the middle of rearwardly tilting movement of the back support member, the lock device 31 is constituted of a fixed side member 33 attached to the base member side and a movable side member 32 attached to the back support member side, the movable side member 32 has a stopper member 37 which turns around a turning axis 38 and both ends 37a of which cross the fixed side member 33 and a drive part 51 turning the stopper member 37, the fixed side member 33 side has holes 34 or recessed parts of the plurality of steps into which both the end parts 37a of the stopper member 37 fit a rotational direction of the back support member.

Description

  The present invention relates to a locking device that fixes a backrest in the middle of a backward tilting of a chair that can be locked to a base member, and a chair incorporating the same. More specifically, the present invention maintains the state before the operation even if the switching operation of the lock device is performed in a state where the weight does not act on the backrest, and the lock device is switched when the weight acts on the backrest. The present invention relates to a lock device for a locking mechanism of a chair that is effective when applied to a so-called self-holding lock device in which an operation is performed, and a chair incorporating the same.

  Conventionally, in a locking mechanism that allows the backrest of a chair to be locked, the state before operation is maintained even if the lock device is switched while the weight is not acting on the backrest, and the weight acts on the backrest A so-called self-holding type locking device has been proposed in which a switching operation of the locking device is executed when this occurs (Patent Document 1).

  As shown in FIGS. 15 and 16, this locking device includes a plurality of gear-like engagement grooves 102 arranged in the swinging direction of the back support rod 101 and a lock member receiver 103 attached to the back support rod 101. The locking member 104 that locks the tilt of the back support rod 101, the switching means 105 that can be switched between the locking position and the unlocking position, the position holding means 106 that holds the switching means 105 in the unlocking position, and the locking member 104 A lock urging means 107 that elastically urges toward the direction of fitting into the engagement groove 102, one end 108a is disposed opposite to the lock urging means 107, and the other end 108b is connected to the switching means 105. When the switching member 105 is held at the unlocked position by the position holding unit 106, the lock member 103 is pulled out from the engaging groove 102 by the one end 108a. A torsion spring 108 that is elastically urged stronger than the lock urging means 107 and releases the elastic urging by the one end 108 a when the switching means 105 is held in the locked position by the position holding means 106. It has. For this reason, when the lock member 104 is fitted in the engagement groove 102, the inner wall of the engagement groove 102 and the lock member 104 are pressed against each other by the elastic biasing force of the reaction force applying mechanism 110. Even if the lock member 104 is pulled out of the engagement groove 102, the lock member 104 cannot move due to large friction with the inner wall of the engagement groove 102. Thereby, the inclined state of the backrest is self-held.

  Here, the lock member receiver 103 serving as a movable side member of the lock mechanism 111 is fixed to the hexagonal columnar portion of the rotation shaft 112 together with the back support rod 101, and is a seat receiving member around the rotation shaft 112 together with the back support rod 101. 113 is supported so as to be able to swing. On the other hand, the fixed side member of the lock mechanism 111 including the lock member 104 is arranged on the base 114 fixed to the inner wall surface of the seat receiving member 113, the lock member 104, the switching means 105, the lock urging means 107, and the torsion spring. 108 is mounted and is housed inside the seat receiving member 113. When the lock member 104 protrudes toward the engagement groove 102 of the lock receiving member 103 in front of the lock member receiver 103 that swings around the rotation shaft 112 together with the back support rod 101, the base 114 When the locking member 104 straddles the engagement groove 102, the back support rod 101 is locked to the seat receiving member 113. Incidentally, reference numeral 109 in the figure denotes a reaction force spring.

JP 2007-130266 A

  However, in the lock device disclosed in Patent Document 1, it is fixed to the inner wall surface of the seat receiving member 113 in the engagement groove 102 of the fan-shaped gear-shaped lock receiving member 103 that swings around the rotation shaft 112 together with the back support rod 101. Since the front end of the lock member 104 that linearly moves back and forth on the base 114 is engaged by being pushed in by the spring force, the lock member 104 is cantilevered on the base 114. Therefore, there is a problem that the supporting rigidity is weak. In order to solve this problem, it is necessary to increase the thickness of the lock member 104 in order to ensure rigidity, and the lock receiving member 103 side is accordingly increased in size as the groove width of the engagement groove 102 increases. . In addition, when using two-point support, there is a problem that the number of parts increases.

  In addition, since the locking member 104 linearly reciprocates in the horizontal plane and the engaging groove 102 of the sector gear-shaped lock receiving member 104 that swings in the vertical plane are fitted and locked, the locking member 104 If the clearance between the engagement groove 102 and the engagement groove 102 is not large, the locking operation and the unlocking operation will not be smooth. For this reason, the backlash in the fitting state of the lock member 104 and the engagement groove 102 becomes large, and a structural measure for avoiding it is necessary.

  Further, since the sector gear-shaped lock receiving member 104 having a plurality of engaging grooves 102 is swung around the rotation shaft 112 together with the back support rod 101, a large space is required and a cover that covers the lock mechanism Or the comparatively large thing is required as the seat receiving member 103. For this reason, the seat receiving member 103 or the space around it cannot be slimmed.

  Furthermore, according to the locking device described in Patent Document 1, while fixing the lock member receiver 103 to the hexagonal columnar portion of the rotating shaft 112 together with the back support rod 101, the base 114 is fixed to the inner wall surface of the seat receiving member 113, Further, since the lock member 104, the switching means 105, the lock urging means 107, the torsion spring 108, and the like are mounted thereon and the fixed side member of the lock mechanism 111 is accommodated inside the seat receiving member 113, it is retrofitted. Is an impossible structure.

  Therefore, an object of the present invention is to provide a lock device for a locking mechanism of a chair that has a strong support rigidity and can be reduced in size by thinning a lock member. Another object of the present invention is to provide a locking device for a locking mechanism of a chair in which fitting and disengagement between a lock member and an engagement groove is smooth. Another object of the present invention is to provide a lock device for a chair locking mechanism that can be retrofitted.

  In order to achieve such an object, the present invention includes a back support member connected to a base member supported by a leg so as to be tilted backward, and the back support member is attached to the base member during the backward tilting operation of the back support member. In the locking device for the locking mechanism of the chair locking mechanism, the locking device is composed of a fixed side member attached to the base member side and a movable side member attached to the back support member side, and the movable side member is centered on the rotation axis. A stopper member whose both ends intersect with the fixed side member by a turning operation and a driving portion for turning the stopper member are provided, and a hole or a recess into which both ends of the stopper member are fitted is provided on the fixed side member. A plurality of stages are provided in the rotation direction.

  Here, the locking device is interposed between the first spring for biasing the stopper member toward the hole or recess of the fixed member and the stopper member and the driving member, and transmits the movement of the driving member to the stopper member. And when the stopper member cannot follow the locking operation or unlocking operation of the driving portion, the linkage of the driving portion and the stopper member is separated by the expansion and contraction of the second spring, and the driving member is displaced. Is preferably stored as a spring force, and the stopper member is turned by the spring force stored in the second spring when the frictional force between the fixed member and the fixed member applied to the stopper member is reduced.

  In the locking device for a locking mechanism of a chair according to the present invention, the movable side member and the fixed side member are configured as a unit independent of the base member and the back support member, and can be freely attached to and detached from the base member and the back support member. Preferably there is.

  In addition, the movable side member includes a hole through which a rotation shaft for connecting the back support member to the base member so as to be rockable is penetrated, and a bearing recess that engages with a pin provided at the tip of the back support member protruding forward from the rotation shaft; It has a groove-shaped base frame composed of a pair of left and right side walls provided with holes for passing both ends of the stopper member and a base top plate that supports the stopper member, while the fixed member is a movable member A hole or recess into which both ends of the stopper member are fitted is provided in a plurality of steps in the rotation direction of the back support member, and a space around a space in which the locking device of the base member is fitted on the outside of both side walls. It is preferable that it is comprised with a grooved frame provided with the flange part for fixing to.

  Further, the movable side member and the fixed side member are assembled between the base member and the back support member in front of the rotating shaft that connects the back support member to the base member so as to be rockable, and the groove-shaped base of the movable side member. It is preferable that the groove-shaped frame of the fixed side member is disposed so as to straddle the frame so that the groove-shaped base frame of the movable side member is accommodated inside the groove-shaped frame of the fixed side member.

  Furthermore, this invention is a chair incorporating the locking device for the locking mechanism of the chair according to any one of claims 1 to 6.

  According to the locking device for a locking mechanism of a chair of the present invention, the stopper member is engaged with the fixed side member at the same time by rotating the stopper member so that the lock is established. As a smoother, it is possible to configure a locking device with less malfunction and strong strength. Moreover, since the locking at both ends can be completed by the rotational movement of one stopper member, the number of parts is small, the structure can be simplified, and the stopper member can be made thinner by fixing it at two points. It becomes.

  Moreover, since the stopper member is provided on the movable side member so as to rotate together with the back support member, it is possible to save space compared to the case where the fixed side member having a large volume is moved, and the locking device itself. Can be made compact and the occupied space can be reduced. Therefore, the space under the seat can be effectively used and a large space is not required, and a relatively small cover or cover receiving member for covering the lock device is sufficient. Slimming can be achieved.

  According to the lock device of the third aspect of the present invention, the movable side member and the fixed side member are configured independently from the base member and the back support member of the chair, and can be attached to the base member and the back support member, respectively. Since it has a structure, if the base member has a space for fitting the movable side member and the fixed side member respectively and a screw hole for passing a bolt for fixing the flange portion of the fixed side member, a complicated structure can be obtained. Since it does not exist on the base member, it can be easily retrofitted.

  According to the locking device of the fourth aspect of the present invention, the rotation shaft is passed through the holes at the rear ends of the both side wall portions of the movable side member, and the bearing concave portions of the both side wall portions are formed in the pins at the front end of the back support member. By allocating, the movable side member is integrated with the back support member and interlocked with the back support member. On the other hand, the fixed side member is inserted into the space of the base member and the flange portion is used as the base member. If the screw is fixed, the groove-shaped frame of the fixed-side member is installed so as to straddle the groove-shaped base frame of the movable-side member, and the stopper member and both ends of the movable-side member are passed through the same turning locus around the rotation axis. And a hole or recess of the fixed side member into which both ends of the stopper member are fitted. Therefore, it can be easily assembled between the base member and the back support member of the chair.

  According to the locking device of the fifth aspect of the invention, the movable side member and the fixed side member are located in front of the rotation shaft that connects the back support member to the base member so as to be lockable. The groove-shaped base frame of the movable side member is disposed inside the groove-shaped frame of the fixed-side member, and the groove-shaped base frame of the movable-side member is disposed inside the groove-shaped frame of the fixed-side member. Since it is accommodated, it does not take a place in the state assembled | attached between the base member and back support member of the chair.

It is a center longitudinal section showing a 1st embodiment of a locking device of the present invention. It is a top view which shows the principal part of the same locking device. It is a side view of the fixed side member of a locking device. It is a top view of the stationary side member of a locking device. It is a center longitudinal cross-sectional view which shows one Embodiment which shows the relationship between the seat receiving member and back support member of the chair incorporating the locking device. It is a center longitudinal cross-sectional view which shows the movable side member of other embodiment of a locking device. It is a bottom view of the locking device of FIG. It is a bottom view of the lock device in the unlocked state. It is a bottom view of the locking device in a locked state. FIG. 7 is a central longitudinal sectional view showing an embodiment showing a relationship between a seat receiving member and a back support member of a chair incorporating the locking device of FIG. 6. It is a top view which shows the seat receiving member and back support member of a chair incorporating the lock device. It is a schematic side view of the chair which can incorporate the locking device of the present invention. It is a principle figure which expands and shows the reaction force mechanism part of the chair. It is an enlarged view of a chair provided with a reaction force mechanism in the back of the axis of rotation which connects a back support member to a base member. It is a longitudinal cross-sectional side view which shows an example of the locking device for the locking mechanisms of the conventional chair. It is explanatory drawing which expands and shows the principal part of the locking device of FIG.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 and 2 show an embodiment of a locking device for a locking mechanism of a chair according to the present invention. As shown in FIG. 5, the lock device 31 of this embodiment includes a back support member 4 that is connected to the base member 2 supported by the legs 1 so as to be tilted backward, and the back support member 4 is tilted backward. In the chair locking mechanism in which the back support member 4 is fixed to the base member 2 in the middle, the back support member 4 is connected to the base member 2 by a rotary shaft 7 so as to be lockable, and the base member 2 and the front of the rotary shaft 7 are connected to each other. It is assembled with the back support member 4.

  In the present embodiment, the locking device 31 includes a fixed side member 33 attached to the base member 2 side and a movable side member 32 attached to the back support member 4 side, and a rotating shaft 38 is provided on the movable side member 32 side. A stopper member 37 whose both ends 37a intersect with the fixed side member 33 by pivoting about the center and a drive unit 51 which pivots the stopper member 37 are provided, and both end portions 37a of the stopper member 37 are on the fixed side member 33 side. A plurality of holes 34 or recesses to be fitted are provided on both side walls in the rotational direction of the back support member 4.

  Here, the fixed-side member 33 is constituted by a groove-shaped frame 71 having an opening at the lower side, and three holes 34 are provided radially in a pair of left and right side wall portions 70 depending on the vertical direction, and both side wall portions are provided. A flange portion 35 that protrudes outward and straddles the base member 2 is provided outside the 70. In the present embodiment, three holes 34 are provided at equal intervals on the circumference around the rotation shaft 7, but the number of holes and the pitch of the holes are not limited. The fixed side member 33 is mounted with a flange portion 35 so as to straddle the left and right beam portions of the base member 2, and is fixed to the base member 2 with bolts 36 passed through the through holes 72. The side wall portion 70 having the hole 34 is dropped into the void 62. Further, the movable side member 32 is constituted by a groove-shaped base frame 69 having an opening at the bottom, and a hole 63 and a back support member through which the rotating shaft 7 passes through the rear ends of a pair of left and right side wall portions 67 depending on the vertical direction. 4 is provided with a bearing recess 64 that engages with a connecting pin 13 that receives one end of a reaction force spring 16, for example, a pin provided at a tip projecting forward from the rotating shaft 7 of the fourth. Further, each side wall 67 of the movable side member 32 is formed with one hole 50 for allowing the both ends 37a of the stopper member 37 to pass therethrough. The movable side member 32 is integrated with the back support member 4 by passing the rotating shaft 7 through the hole 63 at the rear end and locating the bearing concave portion 64 on the connecting pin 13 so as to be interlocked with the back support member 4. Composed. It is preferable that the hole 50 of the movable side member 32 and the hole 34 of the fixed side member 33 are both slightly larger than the thickness of the plate-like stopper member 37 to reduce rattling. The stopper member 37, the drive unit 51, the operation wire 48, and the like of the movable side member 32 are supported by the ceiling portion 68 of the groove-shaped base frame 69 of the movable side member 32. The stopper member 37 is operated by an operation lever or the like disposed near the seated person via the operation wire 48.

  Here, the lock device 31 preferably has a self-holding function by interposing a spring in the mechanism. For example, as shown in FIGS. 1 to 2 (or FIGS. 6 and 7), the self-holding mechanism includes a first spring 44 that biases the stopper member 37 toward the hole 34 or the concave portion on the fixed side member 33 side. A second spring 45 that is interposed between the stopper member 37 and the drive unit 51 and transmits the movement of the drive unit 51 to the stopper member 37, and prevents the drive unit 51 from locking or unlocking. When the member 37 cannot follow, the linkage of the drive unit 51 and the stopper member 37 is separated by the expansion and contraction of the second spring 45 and the displacement of the drive unit 51 is absorbed and stored as a spring force. The stopper member 37 is turned by the spring force stored in the second spring 45 when the frictional force between them is reduced. The self-holding function of the locking device means that the stopper member 37 is swung when the stopper member 37 cannot be switched even if the lock state is switched in the drive system by operating an operation lever (not shown). This means that the state of the drive unit 51 is held until a situation that can be achieved. The first spring 44 is weaker than the second spring 45 and preferably has a strength relationship in which the second spring contracts after the first spring 44 contracts first with a force acting in the same direction. .

  The self-holding mechanism of the locking device 31 in the present embodiment is such that the first spring 44 and the second spring 45 are arranged on opposite sides with the stopper member 37 interposed therebetween. The first spring 44 is formed of a torsion coil spring, and is disposed concentrically with the rotation shaft 38 serving as the turning center of the stopper member 37. One end is hooked on the edge of the stopper member 37 and the other end is the movable side member 32. The stopper member 37 is provided so as to be always urged toward the hole 34 or the concave portion of the fixed side member 33 by being hooked by the hole 57 of the ceiling.

  On the other hand, the drive unit 51 including the second spring 45 is engaged with the second slider only in the turning direction of the stopper member 37 through the connecting pin 39 inserted into the elongated hole 56 provided in the stopper member 37. 41 ′, a first slider 40 ′ that can be driven in the front-rear direction in the same direction as the second slider 41 ′, and a swing lever 53 that drives the first slider 40 ′ in the front-rear direction by the operation wire 48 The guide 55 is configured to support the second slider 41 ′ so as to be movable back and forth toward the stopper member 37. The second slider 41 ′ has a hook shape that accommodates the second spring 45, and is provided so that the connecting plate protrudes under the stopper member 37 having the connecting pin 39 at the front end. The bottom of the second half of the second slider 41 ′ is released, and the first slider 40 ′ is inserted inward so as to push the second spring 45 so that it can move back and forth. The stroke end when the second slider 41 ′ is retracted is regulated by contacting the edge of the guide 55. The guide 55 is for supporting the second slider 41 ′ so as to be movable back and forth toward the stopper member 37, and has a groove shape in which only the surface facing the stopper member 37 is opened and the three surrounding surfaces are surrounded. The space is divided. The guide 55 is provided with a projection 65 on one of the left and right side walls and a bracket 66 on the other side wall. The guide 55 is fitted into the hole provided on the side wall of the movable side member 32 and the movable side member 32 is The bracket 66 is fixed to the movable member 32 by fixing the bracket 66 to the ceiling surface with a screw 73. The swing lever 53 is supported so as to be swingable when convex portions 52 projecting from the left and right side walls of the guide 55 are inserted into the bearing holes 54. Further, a wire locking block 47 is provided on the distal end side of the swing lever 53, and a ball at the distal end of the wire 48 fixed to a wire holding bracket 49 formed on the guide 55 is hooked.

  The locking device 31 includes a first spring 44 that constantly biases the stopper member 37 so as to be restored and fitted into the hole 34 on the fixed side member 33 side, and a second slider that operates in conjunction with the stopper member 37. 41 'and the second slider 41' which is driven by the operation wire 48 and is self-held by the second spring 45 which transmits the movement of the first slider 40 'to the second slider 41'. Function is realized. The first spring 44 is weaker than the second spring 45 and has a strength relationship in which the second spring contracts after the first spring 44 contracts first by a force acting in the same direction. Is preferred.

  According to this locking device 31, in the unlocked state in which the stopper member 37 pivots clockwise and is released from the hole 34 of the fixed side member 33, the second slider 41 ′ moves together with the stopper member 37 to the upper left in FIG. The first spring 44 is twisted while being moved. At this time, the first slider 40 'and the swing lever 53 are in a state of rotating in the counterclockwise direction in FIG. Therefore, when the operation wire is extended (released) in order to switch to the locked state, the swing lever 53 and the first slider 40 'are released, and the stopper member 37 pivots counterclockwise by the force of the first spring 44. At the same time, the second slider 41 ′ and the first slider 40 ′ are also pushed back to the state shown in FIG. At this time, if the position of the movable side member 32 does not coincide with the position of the hole 34 of the fixed side member 33, both end portions 37 a of the stopper member 37 abut against both side walls of the fixed side member 33 and the stopper member 37 turns. The tip end 37 a of the stopper member 37 is held in a state of being pressed against the side wall of the movable side member 32. However, when the hole 34 of the movable side member 32 matches the position of the stopper member 37 by the backward tilting or restoring operation of the back support member 4, the stopper member 37 is rotated counterclockwise by the force of the first spring 44. Thus, the state is switched to the locked state in which the hole is inserted into the hole 34 of the movable side member 32. At the same time, the second slider 41 'and the first slider 40' connected by the pin 39 also return to the positions shown in FIG.

  When the operation wire 48 is pulled from this locked state to switch to the unlocked state, the swing lever 53 in FIG. 1 rotates in the counterclockwise direction to advance the first slider 40 ′, and the second spring 45 is urged in a compressing direction. At this time, if the stopper member 37 is in a freely movable state, the second slider 41 ′ and the stopper member 37 are pushed through the second spring 45 to come out of the hole 34 of the fixed side member 33 and enter the unlocked state. Switch. However, when the tip end portion 37 a of the stopper member 37 is fitted in the hole 34 of the fixed side member 33 and is restrained by a frictional force generated between the fixed side member 33 and the movable side member 32, The displacement amount of the first slider 40 ′ is absorbed as the displacement of the second spring 45, and the second spring 45 is compressed while the second slider 41 ′ and the stopper member 37 are held as they are. . When the above-described frictional force or the like is reduced due to some movement in the back support member 4, the second slider 41 ′ and the stopper member 37 are immediately brought into contact with the fixed-side member 33 by the force of the second spring 45. The first spring 44 is twisted at the same time as it is pushed out of the hole 34 and switched to the unlocked state, and a spring force for switching the stopper member 37 to the locked state is stored.

  Moreover, other embodiment of the locking device of this invention is shown in FIGS. The locking device 31 of this embodiment is mainly different from the embodiment shown in FIGS. 1 and 2 in the configuration of the self-holding mechanism. In the self-holding mechanism of the locking device 31 in this embodiment, the drive unit 51 including the first spring 44 and the second spring 45 is disposed on one side of the stopper member 37.

  The drive unit 51 is rotatably attached to the stopper member 37 to directly drive the stopper member 37, a second slider 41 slidable along the first slider 40, A connecting shaft 42 that passes through the first slider 40 and the second slider 41 and slidably connects the second slider 41 to the first slider 40, and a second slider of the first slider 41 It is comprised from the slider 43 which arrange | positions on the surface on the opposite side to the surface where 42 is arrange | positioned, and prevents the connecting shaft from coming off. The second spring is accommodated in a guide groove 46 disposed in the center of the first slider 41 and is provided so as to expand and contract between the rear edge of the first slider and the slider 43. The second spring 45 is a slider 43 that is interlocked via a connecting shaft 42 when the second slider 41 is pulled in a direction to release the stopper member 37 from the hole 34 of the fixed side member 33 by the action of the operation wire 48. Compressed between. And the spring force always urged | biased in the direction which detach | leaves from the hole 34 with respect to the stopper member 37 is stored. The movement of the second slider 41 or the movement of the first slider 40 is transmitted to each other via the second spring 45. Therefore, when the stopper member 37 is constrained in a direction in which the stopper member 37 is swung, for example, the fixed side member 33 and the movable side member in a state where the tip end portion 37a of the stopper member 37 is fitted in the hole 34 of the fixed side member 33. In the state where the tip 37a of the stopper member 37 which is restrained by the frictional force generated between the movable member 32 and the movable member 32 or biased toward the hole 34 is not aligned with the position of the hole 34, The displacement amount of the second slider 41 is absorbed as the displacement of the second spring 45.

  The second slider 42 is provided with a wire locking block 47 into which a ball of an operation wire is inserted and hooked, and is fixed to a wire holding bracket 49 fixed to the movable member 32 by welding or the like. It is provided so that the tip of the wire can be hooked. A first spring 44 is disposed concentrically with the operation wire 48 between the second slider 42 and the movable side member 32 and the integral wire holding bracket 49. Therefore, when the operation wire 48 is pulled, the first spring 44 is compressed in a state where the second slider 41 is attracted, and a force for returning the second slider 41 to the original position is stored. .

  The stopper member 37 is swiveled around a rotating shaft 38 disposed in the center, so that both ends 37 a are simultaneously inserted so as to be obliquely inserted into the holes 34 of the left and right side wall portions 70 of the fixed side member 33. For this reason, compared with the case where it inserts so that a stopper member may be orthogonal to the side wall part 70 of the stationary-side member 33, it can insert smoothly and can be engaged reliably. Moreover, since the locking member 31 is engaged with both ends of the stopper member 37 with respect to the stationary member 33, the structural strength of the locking device 31 can be increased. Therefore, depending on the case, it is possible to make the thickness of the stopper member 37 thinner than in the case of cantilever support. Furthermore, since the stopper member 37 is mounted on the movable side member 32 side, compared to the case where the fixed side member 33 side that requires an area in the height direction in order to provide a plurality of holes 34 is interlocked with the back support member 4. The required space for installing the lock device can be reduced.

    According to this locking device 31, it operates as shown in FIGS. FIG. 8 shows an unlocked state. In this unlocked state, only the second slider 41 is pulled by the operation wire 48 and the stopper member 37 is free to move, so the first spring 44 is compressed and the repulsive force of the second spring 45 The stopper member 37 is held in a state of being detached from the hole 34 of the stationary member 33 while the connecting shaft 42 is pushed to the front end edge of the guide groove 46 of the first slider 40.

  Here, when the operation wire 48 is extended to shift to the locked state, the second slider 41 is pushed out to the first slider 40 side by the force of the first spring 44 and the first spring 44 is released. . At this time, as shown in FIG. 8, if the hole 34 of the movable side member 32 does not coincide with the position of the hole 34 of the fixed side member 33, the stopper member 37 cannot be turned. The slider 40 and the connecting shaft 42 cannot move. For this reason, the 2nd slider 41 advances and stops to the position where the force of the 2nd spring 45 and the 1st spring 44 is in harmony, compressing the 2nd spring 45. In this state, since the second spring 45 is in a compressed state, the stopper member 37 is elastically elastic in the counterclockwise direction in the drawing via the connecting shaft 42 (slider 43), the first slider 40, and the connecting bolt 39. Therefore, the tip 37a of the stopper member 37 is held in a state where it is pressed against the side wall of the movable member 32.

  When the hole 34 of the movable side member 32 matches the position of the stopper member 37 by the backward tilting or restoring operation of the back support member 4, the tip of the stopper member 37 is driven by the force of the second spring 45 and the first spring 44. 37a is inserted into the hole 34 of the movable member 32 to be locked (see FIGS. 7 and 6). In this locked state, the operation wire 48 is stretched and the second slider 41 is pushed by the force of the first spring 44 and the first slider 40 is pushed by the force of the second spring 45, respectively. Since the connecting shaft 42 of the slider 41 moves to the front end edge of the guide groove 46 of the first slider 40 and pushes out the first slider 40 to turn the stopper member 37, the first spring 44 and the second spring The spring 45 is in an extended state.

  When the operation wire 48 is pulled to switch to the unlocked state from the locked state of FIGS. 7 and 6, the second slider 41 is pulled while compressing the first spring 44. At this time, if the stopper member 37 is in a freely movable state, the first slider 40 and the stopper member 37 come out of the hole 34 of the fixed side member 33 via the second spring 45 and enter the unlocked state shown in FIG. Transition. However, when the stopper member 37 is constrained in a direction in which the stopper member 37 is swung, for example, the fixed side member 33 and the movable side member are inserted in the state where the tip end portion 37a of the stopper member 37 is fitted into the hole 34 of the fixed side member 33. 32, the amount of displacement of the second slider 41 is absorbed as the displacement of the second spring 45, and the first slider 40 and the stopper member 37 remain intact. The second spring 45 is compressed while being held in a state (see FIG. 9). In this state, although the operation wire 48 is switched to the unlocked state, only the spring force for detaching the stopper member 37 from the hole 34 of the movable side member 32 is continuously urged. It is. Accordingly, when the above-described frictional force or the like is reduced due to some movement of the back support member 4, the first slider 40 and the stopper member 37 are immediately pulled by the force of the second spring 45, and the fixed-side member The stopper member 37 comes out of the hole 34 of 33, and can shift to the unlocked state shown in FIG.

  The lock device 31 configured as described above is configured independently of the base member 2 and the back support member 4 of the chair provided with the locking mechanism, and can be attached to the base member 2 and the back support member 4, respectively. Therefore, if there is a space 62 in which the lock device 31 is fitted into the base member and a place where the flange 35 of the stationary member 33 is fixed, it can be retrofitted. The base member 2 has only a screw hole (not shown) for passing the bolt 36 and a space 62, and the reaction force spring 16 is also connected to the front end plate 20 of the base member and the connecting pin 13 of the spring support 12 of the back support member. Since the complicated structure is not present on the base member 2, it can be easily retrofitted. Of course, the locking device 31 may be mounted in advance between the base member 2 and the back support member 4 when the chair is assembled, or may be integrally formed with the base member and the back support member 4 in advance.

  FIGS. 12 to 13 show an embodiment of a reaction force mechanism for a backrest incorporating a locking device for a locking mechanism of a chair according to the present invention. This reaction force mechanism for backrest is a weight-reaction-type reaction force mechanism that moves the seat support member 6 in the direction in which the seat support member 6 is lifted when the back support member 4 of the chair is tilted backward, and a spring that returns the back support member 4 to its original position. It is a weight sensing type locking mechanism that uses a reaction force mechanism that utilizes a reaction force spring 16 that loads a force. The reaction force spring 16 is located in front of the rotation shaft 7 of the back support member 4 and the back support member 4 and the seat. It arrange | positions sideways between the support members 6. FIG.

  The chair includes a leg 1, a base member 2 supported by the leg 1, a back support member 4 to which a backrest 3 is attached, and a seat support member 6 to which a seat 5 is attached. The back support member 4 is connected to the bracket 58 of the base member 2 via the link 10 so that the back support member 4 is connected to the bracket 58 of the base member 2 while the back support member 4 is connected to the bracket 58 of the base member 2. The back support member 4 is connected to the rear link pin 9 so that the rear link pin 11 extends rearward of the seat support member 6 and obliquely upward and forward from the rotation shaft 7 of the back support member 4. The lever link 11 at the front of the back support member 4 is rotated so as to lift the rear of the seat support member 6 diagonally upward and backward by a backward tilting operation about the rotation shaft 7 of Zipper while raising the linked link 10 It constitutes a weight corresponding type reaction force mechanism for lifting the front of the member 6.

  The back support member 4 functions as a lever that supports the backrest 3 and simultaneously lifts the seat support member 6 with the backrest rotation shaft 7 as a fulcrum, and is forward of the rotation shaft 7 and above the rotation shaft. A lever receiving portion 12 that supports the end of the reaction force spring 16 via the lever link portion 11 and the connecting pin 13 is provided, and when the seated person leans on the backrest 3, the seat support member 6 is lifted and the reaction force is raised. The spring 16 is contracted to generate a reaction force. The back support member 4 is provided with a restriction pin 14 that passes through a rotation restricting long hole 15 provided in the base member 2, and a stroke end is provided so that the back support member can swing only within a certain range. It is provided to regulate.

  The base member 2 supports the back support member 4 and the seat support member 6 and is rotatably mounted on the leg 1. At least a portion for supporting the back support member 4 and the seat support member 6 and rigidity And is not limited to a specific structure or shape. In the case of this embodiment, the base member 2 is disposed so as to protrude forward on the left and right of the base mounting seat 60 having a conical cylindrical bearing portion fixed to the upper end portion of the column of the leg 1 by an interference fit. The front end of the beam is connected by the front end plate 20 and the horizontal plate 62 to form a frame shape in which a lock device 31 or a space 62 in which the lock device 31 and the reaction force spring 16 are arranged is formed in the center.

  Here, as the reaction force spring 16, a compression coil spring is used in this embodiment. As shown in FIG. 12, the reaction force spring 16 formed of a compression coil spring is formed at the tip of the back support member 4 via a pair of spring mounts 17 and 18 that can be moved toward and away from each other by a guide shaft 19. Between the connecting pin 13 of the force spring receiving portion 12 and the front end plate 20 at the tip of the base member 2, the force spring receiving portion 12 is disposed laterally. Therefore, since the reaction force spring 16 is disposed laterally between the connecting pin 13 of the spring receiving portion 12 of the back support member 4 and the front end plate 20 of the seat support member 6, the spring is lengthened from the fulcrum to the action point. Therefore, it is not necessary to use a strong spring such as a mold spring. One spring mount 17 is provided with a recess into which the spherical surface at the tip of the adjusting screw 21 is fitted, and the other spring mount 18 is provided with a semicircular hook that engages with the connecting pin 13. The front end plate 20 of the base member 2 is provided with an adjusting screw 21 whose tip is formed in a spherical shape, and the initial compression amount of the reaction force spring 16 is adjusted by changing the amount of protrusion of the adjusting screw 21 from the front end plate 20. In addition, the strength of the reaction force generated can be adjusted. The spherical surface at the tip of the adjusting screw 21 forms a spherical seat with the concave portion provided in one spring mount 17 of the reaction force spring 16. Therefore, the reaction force spring 16 can be adjusted by changing the initial length of the reaction force spring 16 while making the inclination of the reaction force spring 16 variable by moving the adjustment screw 21 in and out.

  In this embodiment, in order to enable the angle adjustment of the reaction force spring 16, the adjustment plate 22 having the screw hole 23 into which the adjustment screw 21 is screwed into the front end plate 20 of the base member 2 is provided with the positioning bolt 24 and the long hole. 25 is attached to the front end plate 20 so as to be movable in the vertical direction. However, when the angle of the reaction force spring 16 is fixed when the reaction force spring 16 is assembled, the front end plate is formed by welding or the like. 20 and the adjustment plate 22 may be fixed, or the front end plate 20 itself may be provided with an adjustment screw 21. The adjusting screw 21 protrudes from the adjusting plate 22 toward the spring mount 17 of the reaction force spring 16.

  According to the reaction force mechanism for the backrest configured as described above, when the seated person leans against the backrest 3, the backrest 3 and the back support member 4 are centered around the rotation shaft 7 while pushing and shrinking the reaction force spring 16. Tilt backwards as shown by phantom lines. At the same time, since the seat support member 6 is about to be lifted by the lever link portion 11 and the link 10 at the tip of the back support member 4, the weight of the seated person on the seat 5 is converted into a force that pushes back the backrest 3. 4 acts as a reaction force. For this reason, the heavier the person, the greater the force required to tilt the backrest, and the lighter the weight, the smaller the force required to tilt the backrest. That is, the thing of the magnitude | size according to a seated person's weight can be obtained as a rocking reaction force with respect to the force which tilts a backrest backward. On the other hand, when the seated person tries to raise his / her upper body, the reaction force spring 16 extends along with the action of the rocking reaction force caused by the weight, and the back support member 4 is raised forward.

  According to this configuration, the angle of the spring falls as the inclination angle of the back support member 4 increases, so that the generated rocking reaction force approaches a constant value. On the other hand, the weight of the seated occupant increases because the angle of the backrest falls asleep. That is, since the angle of the spring falls as the backrest falls back, the amount of compression of the reaction force spring applied by the back support member gradually decreases, and the backrest generated by the reaction force spring is pushed back to the original position. The power to do is weakened relatively. For this reason, it is possible to obtain a reaction force characteristic without a repulsive feeling that the spring is effective near the stroke end, that is, pushed back. That is, it is possible to obtain a rocking reaction force that does not have a springiness, which is generally said to have a high-class feeling.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, the description has mainly been given with reference to an example applied to a weight sensing type locking mechanism. However, the present invention is not particularly limited thereto, and a general reaction force mechanism that supports a backrest only by a reaction force spring. Needless to say, the present invention can also be applied to the case of using. In the above-described embodiment, the description has been mainly given of the example in which the lock device 31 is disposed in front of the rotation shaft 38. However, the present invention is not particularly limited thereto, and is disposed on the rear side of the rotation shaft. Anyway. In the above-described embodiment, the example in which the reaction force spring 16 is disposed in front of the rotation shaft 38 has been mainly described. However, the present invention is not particularly limited to this, and as illustrated in FIG. Even when the reaction force spring 16 is disposed on the rear side, the base member 2 and the back support member 4 between the base member 2 and the back support member 4 in front of the rotation shaft 38 or the rear side of the rotation shaft 38 are also provided. You may make it arrange | position the locking device 31 between.

2 Base member 4 Back support member 7 Rotating shaft 16 of the back supporting member Reaction force spring 31 Lock device 32 Movable member 33 Fixed member 34 Fixed member hole 37 Stopper member 38 Rotating shaft 44 First spring 45 Second Spring 50 Hole 51 through which stopper member of both side wall portions of movable side member is penetrated Driving portion 62 Space 63 for accommodating movable side member and stationary side member Hole 64 through which rotation shaft is penetrated Bearing concave portion engaged with pin of back support member 67 Side wall portion 68 of movable side member Ceiling portion 69 of movable side member Groove-shaped base frame 70 constituting movable side member Side wall portion 71 of fixed side member Grooved frame constituting fixed side member

Claims (6)

For a rocking mechanism of a chair, comprising a back support member connected to a base member supported by a leg so as to be tilted backward, and fixing the back support member to the base member during a backward tilting operation of the back support member In the locking device, the locking device includes a fixed side member attached to the base member side and a movable side member attached to the back support member side, and the movable side member pivots around a rotation axis. A stopper member whose both ends intersect with the fixed side member and a drive unit for rotating the stopper member are provided, and a hole or a recess into which the both end portions of the stopper member are fitted is provided on the fixed side member side. A locking device for a locking mechanism of a chair, comprising a plurality of steps in the rotation direction of the chair. The locking device includes a first spring that urges the stopper member toward the hole or the concave portion of the stationary member, and is interposed between the stopper member and the driving member to control the movement of the driving member. A second spring that transmits to the stopper member, and when the stopper member cannot follow the locking operation or unlocking operation of the driving unit, the driving unit and the stopper member A spring force stored in the second spring when the frictional force with the fixed member applied to the stopper member is reduced by separating the linkage operation and absorbing the displacement of the drive member and storing it as a spring force. The locking device for a locking mechanism of a chair according to claim 1, wherein the stopper member is turned. The movable side member and the fixed side member are configured as a unit independent of the base member and the back support member, and are detachable from the base member and the back support member. 3. A locking device for a locking mechanism of a chair according to 1 or 2. The movable member is engaged with a hole through which a rotation shaft that connects the back support member to the base member so as to be rockable is penetrated, and a pin provided at a front end of the back support member protruding forward from the rotation shaft. A groove-shaped base frame comprising a pair of left and right side wall portions provided with holes for allowing passage of both ends of the bearing recess and the stopper member and a base top plate for supporting the stopper member; The member includes a pair of left and right side wall portions in which the holes or recesses into which both end portions of the stopper member of the movable side member are fitted are provided in the rotation direction of the back support member, and the outside of the both side wall portions. The chair according to any one of claims 1 to 3, wherein the chair includes a grooved frame including a flange portion for fixing around a space into which a lock device for the base member is fitted. Locking mechanism for locking device. The movable side member and the fixed side member are assembled between the base member and the back support member in front of the rotation shaft that couples the back support member to the base member so as to be rockable, and are movable. The groove-shaped frame of the movable side member is accommodated inside the groove-shaped frame of the fixed-side member by arranging the groove-shaped frame of the fixed-side member so as to straddle the groove-shaped base frame of the side member. The locking device for a locking mechanism of a chair according to claim 4, which is configured as described above. A chair incorporating the locking device for a locking mechanism of a chair according to any one of claims 1 to 6.

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