JP5460998B2 - Locking mechanism of the locking device - Google Patents

Description

  The present invention relates to a locking mechanism of a locking device. More particularly, the present invention relates to a locking mechanism for a locking device that locks the chair in a state where the backrest of the chair is raised.

  Some locking devices that allow the backrest to tilt backward include a locking mechanism that locks the backrest while the backrest is raised. As a locking mechanism of the locking device, for example, there is a sliding type disclosed in JP-A-8-182564. This sliding lock mechanism is shown in FIGS. The sliding lock mechanism has a lock body 102 fixed to the rear end of an operation lever 101 slidable back and forth, and between a rear end edge 103 a of a seat receiving body 103 and a foot 104 a fixed to a back support body 104. The backrest is locked by inserting the lock body 102.

  That is, when the operating lever 101 is slid forward and the lock body 102 is pulled out from between the rear edge 103a and the foot 104a, the back support 104 swings around the support shaft 105 and the backrest is lowered. It is possible to tilt backward. On the other hand, with the backrest raised, that is, with the back support 104 moved to the initial position, the operation lever 101 is slid rearward, and the lock body 102 is inserted between the rear edge 103a and the foot 104a. Then, when the foot 104a hits the lock body 102, the swinging of the back support body 104 is prohibited, and the back support body 104 is locked at the initial position. This prevents the backrest from tilting backwards.

  Another type of locking mechanism is, for example, a groove insertion type disclosed in Japanese Patent Application Laid-Open No. 2007-130266. This groove insertion type locking mechanism is shown in FIGS. For example, the groove insertion type lock mechanism is configured such that a lock member 106 is slidably provided on a seat receiving member (not shown), and the back member is inserted into the engagement groove 7 of the lock member receiver 107 attached to a back support rod (not shown). Is to lock.

  That is, in a state where the lock member 106 is pulled out from the engagement groove 108, the back support rod can swing around a rotation shaft (not shown) to tilt the backrest backward. On the other hand, when the lock member 106 is inserted into the engagement groove 108 by operating the cable 109, the lock member receiver 107 is prohibited from swinging, and the back support rod is locked at that angle. This makes it impossible to tilt the backrest.

  The locking member receiver 107 is provided with a plurality of engaging grooves 108. By changing the engaging groove 108 into which the locking member 106 is inserted, the angle for locking the back support rod can be changed, and the angle for fixing the backrest can be changed. Can be adjusted.

JP-A-8-182564 JP 2007-130266 A

  However, in the slide type locking mechanism, since the lock body 102 is inserted while sliding between the rear end edge 103a of the seat receiving body 103 and the foot portion 104a, the interval between the rear end edge 103a and the foot portion 104a is inserted. Needs to be wider than the height of the lock body 102. Therefore, with the lock body 102 inserted between the rear end edge 103a and the foot 104a, that is, with the back support 104 locked in the initial position, the rear end edge 103a or the foot 104a and the lock body 102 A gap is generated between the back support 104 and the back support 104.

  In the groove insertion type lock mechanism, the positional relationship between the lock member 106 and the engagement groove 108 may be shifted due to the load of the seated person. For this reason, when trying to lock in the initial position in the seated state, it may be difficult to smoothly insert the lock member 106 due to a positional shift, and the operability may be deteriorated.

  It is an object of the present invention to provide a locking mechanism for a locking device that can prevent backlash in a locked state and that can be smoothly operated.

To achieve this object, the invention according to claim 1 is a locking mechanism of a locking device that tilts the backrest backward by swinging a swinging member that supports the backrest relative to the support member supported by the legs. It is connected swingably to one of the support member and the swinging member, when the oscillating member is moved to the initial position, seen write slippage between the other one of the support member and the swinging member A lock that can swing between a lock position that supports the swing member as a support rod that does not require a support to prevent falling, and a lock release position that is disengaged between the support member and the other swing member The member, the support member, and the swing member are swingably connected to each other, and the operation member that swings the lock member and the operation member are held at the first position that swings the lock member to the lock position. With position holding means A.

  Therefore, when the operation member is swung, the lock member can be swung between the lock position and the lock release position. Now, a case where the lock member is connected to the swing member and the operation member is connected to the support member will be described as an example. When the operating member is swung to the first position while the swinging member is moved to the initial position where the swinging member is not swung, that is, the position where the backrest is raised, the lock member is swung to the lock position. In the locked position, the lock member slides between the support member and is packed between the support member and the swing member, and the swing member at the initial position cannot be swung. The position holding means holds the operating member in the first position, and prevents the swinging member from coming off the lock position.

  The locking mechanism of the locking device according to claim 2 is characterized in that the position holding means has a convex portion or a concave portion that fits into a concave portion or a convex portion provided in the operating member when the operating member is swung to the first position. It is comprised with the elastic member which has. Therefore, when the operating member is swung to the first position, the position holding means that is an elastic member is elastically deformed, and the convex portion of the position holding means is projected into the concave portion of the operating member or the convex portion of the operating member into the concave portion of the position holding means. The part fits in and holds the operation member in position.

  Furthermore, in the lock mechanism of the locking device according to claim 3, the lock member and the operation member are made of resin. Therefore, the lock member and the operation member can be reduced in weight as compared with the case where the lock member and the operation member are made of metal, and can be manufactured at low cost. Further, the lock member and the operation member are easy to slide.

  In the lock mechanism of the locking device according to the first aspect, the lock member is slid while being swung between the support member and the swing member, so that the swing member is placed between the support member and the swing member. The rocking member hits both the support member and the rocking member in the locked state, and no gap is generated between the support member or the rocking member and the lock member. For this reason, it is possible to reliably prevent the rocking member in the locked state from rattling. Further, since the lock member is slid while being oscillated between the support member and the oscillating member, the oscillating member is slightly deviated from the accurate initial position, and the interval between the support member and the oscillating member is increased. Even in a slightly changed state, the lock member can be smoothly slid between the two. For this reason, for example, even if the swing member before the lock is slightly deviated from the accurate initial position due to the weight of the seated person, the swing member can be smoothly locked, and the operability is not deteriorated.

  Further, in the locking mechanism of the locking device according to the second aspect, the operation member can be held at the first position by the elastic force of the position holding means. Can be prevented. In addition, since the position is maintained by fitting the unevenness, it is possible for the person who performs the operation to recognize that the operation has been performed reliably by feeling the fitting of the unevenness.

  Further, in the lock mechanism of the locking device according to the third aspect, since the lock member and the operation member are made of resin, the lock member and the operation member can be reduced in weight and can be manufactured at low cost. Further, by using resin, the slidability of the lock member and the operation member can be improved, and these movements can be made smooth.

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

1 to 5 show an example of an embodiment of a locking mechanism of a locking device of the present invention. A locking mechanism of the locking device (hereinafter simply referred to as a locking mechanism) tilts the backrest backward by swinging a swinging member 3 that supports a backrest (not shown) with respect to a support member 2 supported by a leg 1. Thus, when either the support member 2 or the swinging member 3 is swingably connected and the swinging member 3 is moved to the initial position P1, either the support member 2 or the swinging member 3 is used. a locking position P2 for supporting the swinging member 3 write-falling prevention of freestanding becomes unnecessary prop slippage between the other, departing from between the other one of the support member 2 and the swinging member 3 A lock member 4 that is swingable between the lock release position P3, an operation member 5 that is swingably connected to one of the support member 2 and the swing member 3, and swings the lock member 4; Swing member 5 and lock member 4 to lock position P2 To those provided with position holding means 6 for holding the first position P4. In the present embodiment, the lock member 4 is connected to the swing member 3, and the operation member 5 is connected to the support member 2. However, the lock member 4 may be connected to the support member 2 and the operation member 5 may be connected to the swing member 3.

  The support member 2 is directly or indirectly supported by the leg 1 of the chair. In the present embodiment, the support member 2 is a seat receiving member that is directly supported by the leg 1. However, it is not limited to the seat receiving member, but is supported on the leg 1 directly or indirectly, and when the swinging member 3 is considered as the swinging side, the fixed side supports the swinging side in a swingable manner. If it is good.

  The swing member 3 supports the backrest directly or indirectly. In the present embodiment, the swing member 3 is a back support rod. However, the present invention is not limited to the back support rod, but may be any one that supports the backrest directly or indirectly and swings with respect to the support member 2 as the backrest is tilted backward. The front end of the swing member 3 is swingably connected to the support member 2 by a first swing shaft 7. The swing member 3 is always urged by a reaction force mechanism (not shown) in a direction in which the backrest is raised. A contact portion 3 a is provided at the front end of the swing member 3 and can swing until the contact portion 3 a contacts the stopper 8 provided on the support member 2 by the urging force of the reaction mechanism. Yes. The contact portion 3a contacts the stopper 8 and the position where the swinging member 3 stands most is the initial position P1, that is, the position where the backrest is raised. In the present embodiment, the swing member 3 is constituted by a pair of left and right plate-like members, for example. However, the swing member 3 is not necessarily constituted by a pair of left and right plate-like members.

  The lock member 4 is a link that is swingably connected to the swing member 3. In the present embodiment, the lock member 4 is disposed between the plate-like members of the swing member 3 as viewed from above. Therefore, the lock member 4 is disposed at the center in the width direction of the chair. The lock member 4 is connected to the rocking member 3 by a second rocking shaft 9 in the vicinity of the base end. The distal end surface 4 a of the lock member 4 is slidable on the first receiving portion 11 provided on the support member 2. A first convex portion 10 is provided on the distal end surface 4 a of the lock member 4, and the first convex portion 10 has the first convex portion 10 while the distal end surface 4 a is slid on the first receiving portion 11. It can swing until it hits the receiving portion 11. The 1st convex part 10 has comprised the shape which hits the 1st receiving part 11 exactly, and does not rattle by making a partial clearance gap. In the present embodiment, the distal end of the lock member 4 is divided into two forks, and the divided distal end surfaces 4a have the same shape. Grooves 12 that are continuous from the front end surface 4a are formed on the inner side surfaces of the two divided portions 4b. The two grooves 12 face each other and have the same shape.

  The base end surface 4 c of the lock member 4 is slidable on the second receiving portion 13 provided on the swing member 3. A second convex portion 14 is provided on the base end surface 4c of the lock member 4, and the base end surface 4c swings while sliding on the second receiving portion 13, so that the first convex portion 10 is the first convex portion 10. At the same time as hitting the receiving portion 11, the second convex portion 14 also hits the second receiving portion 13. The 2nd convex part 14 has comprised the shape which hits the 2nd receiving part 13 exactly, and does not rattle by making a partial clearance gap.

  The distal end surface 4a and the proximal end surface 4c of the lock member 4 are the first receiving members when the lock member 4 is swung from the unlock position P3 (position in FIG. 4) toward the lock position P2 (position in FIG. 1). The part 11 or the second receiving part 13 is gradually approached to come into contact with and slide. Therefore, when the lock member 4 is swung to the lock position P2, the end surfaces 4a and 4c can be caused to slide between the receiving portions 11 and 13 so as to function as wedges.

  The locking member 4 slides between the first receiving part 11 and the second receiving part 13, the first convex part 10 hits the first receiving part 11, and the second convex part 14 becomes the second receiving part. The position corresponding to 13 is the lock position P <b> 2 of the lock member 4. In the lock position P2, the first receiving portion 11, the second receiving portion 13, and the second swing shaft 9 are aligned in a straight line when viewed from the width direction of the chair. Further, a position where the lock member 4 is disengaged from between the support member 2 and the swing member 3 is a lock release position P3.

  The 1st receiving part 11 is the shaft fixed along the width direction of the chair with respect to the support member 2, for example. However, the 1st receiving part 11 is not restricted to a shaft, A convex part etc. may be sufficient as long as it can hit the 1st convex part 10 and restrict | limit the rocking | fluctuation. In the present embodiment, the third swing shaft 15 that swingably connects the operation member 5 to the support member 2 is used as the first receiving portion 11, and the number of components is reduced by sharing the components. . However, the third swing shaft 15 may be a separate component without being shared as the first receiving portion 11.

  The second receiving portion 13 is, for example, a shaft fixed along the width direction of the chair with respect to the swing member 3. However, the second receiving portion 13 is not limited to the shaft, and may be a convex portion or the like as long as it can come into contact with the second convex portion 14 and limit its swing. The second receiving member 13 is disposed at a higher position than the first receiving member 11.

  In the length of the lock member 4, that is, at the lock position P2, portions of both end faces 4a and 4c intersecting a straight line connecting the center of the cross-sectional shape of the first receiving portion 11 and the center of the cross-sectional shape of the second receiving portion 13 The interval between (P5 point, P6 point) is the same as or slightly longer than the interval between the first receiving portion 11 and the second receiving portion 13. In this embodiment, the length of the lock member 4 is slightly longer than the distance between the first receiving portion 11 and the second receiving portion 13, and the first receiving portion 11 and the second receiving portion 13 are The lock member 4 is slid into the lock position P2 while widening the gap. However, the length of the lock member 4 may be the same as the interval between the first receiving portion 11 and the second receiving portion 13.

  The operation member 5 is a link that is swingably connected to the support member 2. In the present embodiment, the operation member 5 is disposed between the divided portions 4 b of the lock member 4. The operation member 5 is swingably connected to the support member 2 by a third swing shaft 15. The operation member 5 is fixed to the third swing shaft 15. The operating member 5 is provided with a connecting pin 5a for swingably connecting to the lock member 4. In the present embodiment, connecting pins 5 a are provided on both side surfaces of the swing member 3. The operation member 5 can be swingably connected to the lock member 4 by inserting and sliding the connection pins 5a into the grooves 12 (FIG. 5).

  The operation member 5 can swing between a first position P4 where the lock member 4 is swung to the lock position P2 and a second position P7 where the lock member 4 is swung to the lock release position P3. When viewed from the width direction of the chair, in a state where the lock member 4 is swung to the lock position P2, that is, a state where the operation member 5 is swung to the first position P4, each connecting pin 5a is in the first receiving position. The part 11, the second receiving part 13, and the second swing shaft 9 are located behind the chair from the straight line.

  An operating lever (not shown) is connected to the third swing shaft 15 and can be rotated by operating the lever to swing the operation member 5.

  The position holding means 6 is an elastic member having a convex portion or a concave portion that fits into a concave portion or a convex portion provided in the operating member 5 when the operating member 5 is swung to the first position P4, for example. In the present embodiment, the position holding means 6 is provided with a convex portion 16 and the operation member 5 is provided with a concave portion 17. However, the concave portion 17 may be provided in the position holding means 6 and the convex portion 16 may be provided in the operation member 5. In the present embodiment, the position holding means 6 is constituted by a resin spring. However, the position holding means 6 may be constituted by an elastic member other than the resin spring, for example, a rubber spring, a spring made of spring steel, or the like. In the present embodiment, two concave portions 17 are formed in the operation member 5 so that the operation member 5 can be held at the second position P7 in addition to being held at the first position P4. However, it is not always necessary to be able to hold the position at both the first position P4 and the second position P7, as long as the position can be held at least at the first position P4. The position holding means 6 is attached to a position below the operation member 5 of the support member 2.

  The lock mechanism of the present invention is provided at the rear end of the support member 2 and is separated as much as possible from the first swing shaft 7. By moving the lock mechanism away from the first swing shaft 7 as much as possible, the movement of the swing member 3 at the position where the lock mechanism is provided can be increased, and the lock member 4 and the operation member 5 can be moved accordingly. It can be formed large. Therefore, even if the lock member 4 and the operation member 5 are made of resin, the required component strength can be ensured, and the lock member 4 and the operation member 5 can be made of resin.

  The lock member 4 has a structure that slides between the first receiving member 11 and the second receiving member 13 to support the second receiving member 13 from below and locks the swinging member 3. A load such as a weight acts in a direction in which the lock member 4 is compressed. Therefore, compared with the case where a load acts in the bending direction or the like, the component strength required as the lock member 4 is small, and from this fact, it is possible to use a resin member as the lock member 4. Further, since the load such as the weight of the seated person does not directly act on the operation member 5, it is not necessary to consider the handling of the large load on the operation member 5. Is possible.

  Furthermore, since the lock member 4 is disposed at the center in the width direction of the chair, a load such as the weight of the seated person does not act as a moment for tilting the lock member 4 left and right. Therefore, the component strength required for the lock member 4 and the operation member 5 is small, and from this, it is possible to use a resin member as the lock member 4 and the operation member 5.

  As described above, in the present embodiment, the resin lock member 4 and the operation member 5 are used. As a result, the lock member 4 and the operation member 5 can be reduced in weight and can be manufactured at low cost. Moreover, the sliding property of the lock member 4 and the operation member 5 can be improved by using resin, and these movements can be made smooth. However, the metal lock member 4 and the operation member 5 may be used.

  Next, the operation of the lock mechanism will be described.

When the operation lever is operated to rotate the third swing shaft 15 and swing the operation member 5, the connecting pin 5 a swings the lock member 4 while sliding in the groove 12. When the operating member 5 is swung to the first position P4 while the swinging member 3 is moved to the initial position P1, the lock member 4 is swung to the lock position P2, and the support member 2 and the swinging member 3 are swung. since functions as have Tsukka packed therebetween rod slipped between, it is impossible to swing the swing member 3. As a result, the swing member 3 is locked, and the backrest cannot be tilted backward (FIG. 1).

  Since the lock member 4 slides between the receiving portions 11 and 13 with its both end surfaces 4a and 4c functioning like wedges, the length of the locking member 4 is longer than the interval between the receiving portions 11 and 13. In addition, the lock member 4 can be smoothly slid between the receiving portions 11 and 13. Therefore, the lock member 4 can be smoothly swung to the lock position P2. Similarly, even when the swing member 3 slightly sinks from the accurate initial position P1 due to the weight of the seated person and the interval between the receiving portions 11 and 13 is shortened, the lock member 4 is moved to the receiving portion 11. , 13 can be slid smoothly, and the lock member 4 can be smoothly swung to the lock position P2. Therefore, the operability of the chair can be improved without deteriorating the operability.

  In addition, the lock member 4 is slid between the receiving portions 11 and 13, and no gap is generated between the receiving portions 11 and 13 and the lock member 4 at the lock position P2. Shaking of the swing member 3 can be prevented.

  When the operating member 5 is swung to the first position P4, the convex portion 16 of the position holding means 6 enters the concave portion 17 of the operating member 5, and holds the operating member 5 in position. Therefore, it is possible to prevent the lock of the swing member 3 from the initial position P1, in other words, the lock in the standing state of the backrest from being inadvertently released.

  From this state, when the operation lever is operated to swing the operation member 5 from the first position P4 to the second position P7, the lock member 4 swings from the lock position P2 to the lock release position P3. The member 4 is removed from between the receiving portions 11 and 13, and the rocking member 3 is unlocked (FIG. 4). Therefore, the backrest can be tilted backward by swinging the swinging member 3 (FIG. 5).

  In a state where the operation member 5 is swung to the second position P7 and the lock member 4 is moved to the unlock position P3, the lock pin 4a slides in the groove 12 so that the lock member 4 is swung. Can swing with respect to. Therefore, even if the operating member 5 does not move from the second position P7, the swing member 3 can be swung while the lock member 4 is swung. That is, the backrest can be tilted backward.

  When the operating member 5 is swung to the second position P7, the convex portion 16 of the position holding means 6 enters another concave portion 17 of the operating member 5, and holds the operating member 5 in position. Therefore, rattling of the operation member 5 and the operation lever in the unlocked state can be prevented.

  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 scope of the present invention.

  For example, in the above description, the protrusions 10 and 14 that contact the receiving portions 11 and 13 are provided on the both end faces 4a and 4c of the lock member 4 to limit the swing of the lock member 4 to the lock position P2. The means for limiting the swing is not limited to this. For example, a convex portion may be provided in each of the receiving portions 11 and 13 so that the swing of the lock member 4 is limited to the lock position P2 by the convex portion hitting the lock member 4.

  In the above description, the load applied to the swing member 3 from the lock member 4 by applying the base end surface 4 c of the lock member 4 to the second receiving portion 13 at the lock position P <b> 2 is caused by the second receiving portion 13. However, the second receiving portion 13 may be omitted and a load acting on the swing member 3 from the lock member 4 by the second swing shaft 9 may be received.

It is sectional drawing of the locked state which showed the locking mechanism of the locking device of this invention, and was seen from the width direction of the chair. It is the figure which showed the locking mechanism of the locking device seen from the back of a chair. It is sectional drawing which showed the locking mechanism of the locking device and was seen from the back of a chair. It is sectional drawing of the lock release state which showed the locking mechanism of the locking device seen from the width direction of the chair. It is sectional drawing of the state which showed the locking mechanism of the locking device, and rock | fluctuated the rocking | swiveling member seen from the width direction of the chair. It is a principal part sectional view in the state where a conventional slide type lock mechanism is shown and a lock is released. It is the principal part sectional drawing of the locked state which shows the slide type locking mechanism. It is a principal part sectional view of a lock state showing a conventional slot insertion type lock mechanism. It is a principal part sectional view of the state where the lock insertion type locking mechanism is shown and the lock is released.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leg 2 Support member 3 Swing member 5 Operation member 6 Position holding means (elastic member)
16 Convex part provided in elastic member 17 Concave part P1 provided in operation member Initial position P2 of swing member 3 Lock position P3 of lock member 4 Lock release position P4 of lock member 4 First position of operation member

Claims (3)

In a locking mechanism of a locking device that tilts the backrest backward by swinging a swinging member that supports the backrest with respect to the support member supported by the leg, the support member and the swinging member are swung to one of the support member and the swinging member. moving freely coupled, when said oscillating member is moved to the initial position, the supporting member and the prop slip write-falling prevention of support is not required between the other one of the swing member A lock member that is swingable between a lock position that supports the swing member, and a lock release position that is disengaged from either the support member or the swing member, and the support member. An operation member that is swingably connected to one of the swing members and that swings the lock member, and the operation member is held at a first position that swings the lock member to the lock position. Position holding means The locking mechanism of the locking device, characterized in that to obtain.   The position holding means is an elastic member having a convex portion or a concave portion that fits into a concave portion or a convex portion provided in the operating member when the operating member is swung to the first position. The locking mechanism of the locking device according to claim 1.   The locking mechanism of the locking device according to claim 1, wherein the lock member and the operation member are made of resin.

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