JP4065587B2 - Leg rest device for seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to a seat legrest device, and more particularly to a mechanism for adjusting a tilt angle of a legrest in the legrest device.
[Prior art]
[0003]
2. Description of the Related Art Conventionally, train seats are known that have leg rests at the front end of a seat cushion so that a seated person can relax with a lower limb. In this case, it is necessary to be able to adjust the tilt angle of the leg rest according to the request of the seat cushion occupant, and various tilt angle adjusting mechanisms have been proposed in the past to meet such a request. There is one that uses a ratchet mechanism.
[0004]
In other words, the conventional tilt angle adjusting mechanism is configured so that a ratchet plate having a plurality of ratchet teeth formed on the outer peripheral surface thereof is concentric with a hinge that connects the front end portion of the seat cushion and one end portion of the legrest so as to be relatively rotatable. It is fixed to the seat cushion side so as to be positioned, and a lock member that selectively engages with the ratchet teeth is attached to the legrest side, and the engagement position of the lock member with respect to the ratchet plate is adjusted to adjust the engagement position. The tilt angle of the legrest is adjusted.
[Problems to be solved by the invention]
[0005]
However, when the tilt angle adjusting mechanism is constituted by such a latitudinal mechanism, there are the following problems.
[0006]
That is, since the ratchet mechanism is provided in the hinge portion, it is necessary to secure a layout space for the ratchet mechanism in the hinge portion. The degree of freedom is hindered, leading to a reduction in the commercial value of the sheet.
[0007]
In addition, since the load applied to the legrest is supported by the latitut mechanism, it is necessary to increase the diameter of the latitud plate and lengthen the moment arm in order to reduce the support load value on the latitut mechanism side. However, such an increase in the moment arm directly leads to an increase in the size of the latitudinal mechanism and an increase in its arrangement space, which is not preferable in any case. For this reason, there is a limit to the expansion of the diameter of the latitudinal plate. There are problems in terms of reliability and durability.
[0008]
Therefore, the present invention has been made with the object of providing a leg rest device for a seat that does not impede the degree of freedom in designing the seat and has high reliability and durability.
[Means for Solving the Problems]
[0009]
In the present invention, the following configuration is adopted as a specific means for solving such a problem. That is, in the seat leg rest device in which the leg rest is attached to the front end portion of the seat cushion so as to be tiltable in the vertical direction, a plurality of notched latch grooves are formed in the seat cushion at appropriate intervals in the axial direction. And a latch shaft that is movable in the axial direction of the latch shaft and the latch shaft that can be selectively engaged with the plurality of latch grooves, and the latch groove that is engaged is formed at a position on the latch shaft. A latch mechanism including a latch pin for restricting the movement of the latch shaft at a corresponding movement position, at a position closer to the center in the width direction than the side end of the seat cushion, and the axial direction of the latch shaft is the longitudinal direction of the seat cushion. The latch shaft and the leg rest are connected to each other by a connecting arm. Binding to, a displacement in the axial direction of the latch shaft via the connecting arm while configured so as to transmit the change of the tilt angle to the leg rest, it operates in correspondence with the movement position of the latch shaft 22 The latch pin in a state where the latch pin is positioned closer to the rear end than the latch groove at the rearmost end of the latch shaft, and a first rotation position that allows the latch pin to be engaged and disengaged from the respective latch grooves. In a disengaged state with the latch shaft, and in a state in which the latch pin is held in the second rotational position, the latch shaft moves in the backward direction so that the latch pin is at the foremost end. When the position reaches the vicinity of the latch groove, the strike is set to the third rotational position that allows the latch pin to enter the latch groove at the foremost end. It is characterized by having a Pureba.
【The invention's effect】
[0010]
According to the seat leg rest device of the present invention, the adjustment of the tilt angle of the leg rest and the holding of the tilt angle are selectively engaged in the latch shaft and the plurality of latch grooves provided in the latch shaft. Since the latch mechanism includes a latch pin, and the connecting arm that transmits the displacement of the latch shaft in the latch mechanism in the axial direction to the leg rest as the displacement of the tilt angle thereof, the leg rest The load is transmitted as an axial force to the latch shaft via the connecting arm, and this axial force is supported by the engagement between the latch groove of the latch shaft and the latch pin engaged with the latch groove.
[0011]
Therefore, the allowable supporting force on the latch shaft side can be easily increased by increasing the diameter of the latch pin. In addition, the diameter of the latch pin is enlarged because the latch mechanism is not located at the side end of the seat cushion where the hinge between the seat cushion and the leg rest is arranged, but at a position closer to the center in the width direction than the side end. Therefore, the design freedom of the sheet is not hindered to secure the arrangement space. As a result, it is possible to achieve both improvement in the commercial value of the seat by enhancing the design of the seat and improvement in the reliability and durability of the legrest.
[0012]
Further, in the present invention, since the stop lever is provided, the latch pin is engaged with an arbitrary latch groove of the latch shaft by only the tilting operation of the legrest, and the tilting position is changed. Can do.
DETAILED DESCRIPTION OF THE INVENTION
[0013]
Hereinafter, the leg rest device for seats of the present invention is concretely explained based on a suitable embodiment shown in an accompanying drawing.
[0014]
In FIG. 1, the seat Z for trains provided with the legrest apparatus X concerning this invention is shown. The seat Z is disposed on both the left and right sides of the seat cushion 1, a seat cushion 1 that is rotatably mounted on the leg stand 4, a seat back 2 that is reclinably attached to the rear end portion of the seat cushion 1, and the seat cushion 1. And armrests 3 and 3. And the legrest apparatus X provided with the legrest 10 is attached to the front-end part of the said seat cushion 1 so that tilting to an up-down direction is possible. In addition, when the seat Z is rotated, the reclining state of the seat back 2 is released to bring the seat back 2 into the forward leaning posture and the posture at a predetermined tilting angle. There is provided a lock release pedal 5 for releasing the posture holding action of the held legrest 10 to make it the lowest tilted posture.
[0015]
The present invention has the greatest feature in the structure of a later-described latch mechanism 20 that adjusts and holds the tilt angle of the legrest 10 in the legrest device X. Hereinafter, the structure of the latch mechanism 20 will be described. The operation and the like will be described in detail.
[0016]
2 and 3 show the latch mechanism 20 disposed on the lower surface side of the seat cushion frame 6 of the seat cushion 1. Note that the seat cushion 1 of the seat Z and the leg rest 10 of the leg rest device X are predetermined on the rear end spar 6b of the seat cushion frame 6 of the seat cushion 1, as shown in FIGS. A pair of left and right connecting brackets 7 and 7 arranged at intervals and a pair of left and right support arms 14 and 14 arranged at predetermined intervals in the width direction at one end of the leg rest frame 11 of the leg rest 10 are respectively pivoted. The pivots 15 and 15 are pivotally supported so as to be relatively rotatable.
[0017]
As shown in FIGS. 1 to 4, the latch mechanism 20 is attached across the front end girder material 6 a and the rear end girder material 6 b at a substantially central portion in the width direction of the seat cushion frame 6. The support frame 21 is provided. The support frame 21 is a mold member having a pair of left and right side walls 21c and 21d facing each other at a predetermined interval, and one end 21a and the other end 21b in the axial direction thereof are respectively connected to the front end beam member 6a of the seat cushion frame 6. The rear end beam member 6b is fixed by welding.
[0018]
A shaft guide provided at a substantially central position in the axial direction of the support frame 21 with a concave groove 18 extending in the width direction and a shaft fitting insertion hole 19 perpendicular to the concave groove 18 and penetrating in the axial direction. 17 is fixed with the open end of the concave groove 18 facing upward. A latch shaft 22 described below is inserted into the shaft insertion hole 19 of the shaft guide 17 so as to be slidable in the axial direction.
[0019]
As shown in FIG. 6, the latch shaft 22 is composed of a rod body having a predetermined length, and one end 22a of the connecting arm 23 described later is pivotally connected to one end 22a thereof via a connecting pin 24 described later. Further, on one side of the outer peripheral surface of the latch shaft 22, a first latch groove 25A located near one end 22a and four latch grooves located near the other end 22b and arranged at a predetermined interval in the axial direction, that is, A second latch groove 25B to a fifth latch groove 25E are provided. Further, a protruding portion 26 that protrudes from the outer peripheral surface of the latch shaft 22 to a predetermined height and extends in the axial direction is provided immediately after the fifth latch groove 25E.
[0020]
The latch shaft 22 is inserted into the shaft insertion hole 19 of the shaft guide 17 with the other end 22b facing the other end 21b of the support frame 21, as shown in FIGS. Has been. In this case, the latch shaft 22 is slidable in the axial direction by a guide mechanism (not shown) while maintaining the posture in which the latch grooves 25A to 25E are directed upward.
[0021]
On the other hand, the connecting arm 23 is composed of a rod body having a predetermined length, and one end 23a of the connecting arm 23 is connected to the connecting bracket 12 (see FIGS. 2 and 3) provided on the back side of the legrest frame 11. The other end 23b is pivotally connected to the one end 22a of the latch shaft 22 via the connecting pin 24 as described above.
[0022]
Therefore, when the latch shaft 22 moves in the axial direction, the displacement is transmitted to the leg rest 10 via the connecting arm 23, and the tilt angle of the leg rest 10 is changed. In other words, due to the weight of the legrest 10 and the weight of the leg of the seated person on the legrest 10, a rotational force that rotates the legrest 10 downward about the pivot shaft 15 acts on the legrest 10. In this case, this rotational force is transmitted as an axial force to the latch shaft 22 via the connecting arm 23. For this reason, the legrest 10 can be set to a predetermined tilt angle and the tilt angle can be maintained as it is by appropriately restricting the position of the latch shaft 22 in the axial direction. In order to adjust and hold the tilt angle of the legrest 10, various members are provided on the support frame 21 side as described below.
[0023]
That is, the side walls 21c, 21 near the one end 21a of the support frame 21 are formed with long grooves 28, 28 extending linearly in the axial direction of the support frame 21, and more than the rear ends of the long grooves 28, 28. Arc grooves 29, 29 extending in the vertical direction on both side walls 21c, 21 are formed at positions close to the other end 21b and corresponding to the groove 18 of the shaft guide 17.
[0024]
A latch pin 27 that engages with each of the latch grooves 25 </ b> A to 25 </ b> E of the latch shaft 22 is disposed through the arc grooves 29 and 29 so as to cross the concave groove 18. As shown in FIG. 4, one end of the latch pin 27 is coupled to one end of a first swing lever 31 that is rotatably attached to one side wall 21c of the support frame 21 by a pivot shaft 34. Has been. As shown in FIG. 5, the other end of the latch pin 27 is one end of a second swing lever 32 that is pivotally attached to the other side wall 21d of the support frame 21 by the pivot shaft 34. Is bound to.
[0025]
The first swing lever 31 is always urged to rotate in the direction in which the latch pin 27 is moved upward by the spring force of the first spring 41. Further, the second swing lever 32 is connected to a cable 8 that is pulled when the lock release pedal 5 is depressed. Therefore, when the cable 8 is not pulled, the latch pin 27 is urged toward the groove bottom side of the concave groove 18 by the spring force of the first spring 41, and predetermined latch grooves 25 </ b> A to 25 </ b> E of the latch shaft 22. While the cable 8 is pulled, the cable 8 is pulled away from the groove 18 by the pulling force of the cable 8 against the spring force of the first spring 41. Thus, the latched state of the latch shaft 22 into the predetermined latch grooves 25A to 25E is released.
[0026]
On the other hand, in the long grooves 28 and 28, the connecting pin 24 for connecting the one end 22a of the latch shaft 22 and the other end 23b of the connecting arm 23 is fitted, and in particular, one end of the connecting pin 24 is the above-described one. The support frame 21 protrudes greatly toward the side wall 21c.
[0027]
Further, a stop lever 33 described below is attached by a pivot pin 35 at a position directly below the circular arc grooves 29, 29 on one side wall 21c of the support frame 21. As shown in FIGS. 4 and 7, the stop lever 33 has a shape bent in a substantially L shape, and has one end portion as a first lever portion 33a and the other end portion as a second lever portion 33b. A protrusion 33c is formed near the tip of the second lever portion 33b. A portion closer to the tip than the protrusion 33c is a first recess 33d, and a portion closer to the base end is a second recess 33e. The stop lever 33 is always urged to rotate clockwise (in FIG. 7) about the pivot pin 35 by the spring force of the second spring 42.
[0028]
The stop lever 33 is configured to take the following three rotational positions corresponding to the movement position of the latch shaft 22. That is, the first rotation position is in a state in which the latch pin 27 is engaged with one of the latch grooves 25A to 25E of the latch shaft 22 as indicated by reference numeral 33 in FIGS. The latch pin 27 located in the second recess 33e is a position where the clockwise rotation is restricted.
[0029]
As shown in FIG. 7, the second rotation position is such that the latch pin 27 positioned on the protruding portion 26 of the latch shaft 22 is supported by the first recess 33d and the latch pin 27 is present regardless of the presence of the latch pin 27. At the same time as allowing the movement of the latch shaft 22 in the axial direction, the stop lever 33 itself engages with the latch pin 27 in the biasing rotation direction to restrict its rotation.
[0030]
The third rotation position is a position indicated by reference numeral 33 'in FIG. In other words, this rotational position is the rear side (the other end 22b side) by a predetermined dimension from the restricting position (that is, the position where the latch pin 27 is engaged with the first latch groove 25A) indicated by the solid line of the latch shaft 22. The connecting pin 24 is moved from the position shown by the solid line to the position shown by the chain line (see reference numeral 24 ′), and the connecting pin 24 ′ comes into contact with the first lever portion 33 a of the stop lever 33 to move it. It is in a state of being rotated counterclockwise. When the stop lever 33 moves from the second rotation position (position indicated by reference numeral 33) to the third rotation position, the latch pin supported by the first recess 33d at the second rotation position Reference numeral 27 'denotes a state in which the protrusion 33c gets over and moves toward the second recess 33e to allow the latch pin 27 to be engaged with the first latch groove 25A.
[0031]
Subsequently, the operation of the legrest device X will be described in relation to the engagement state between the latch shaft 22 and the latch pin 27.
[0032]
First, the tilt angles that the leg rest 10 can take are set. In this embodiment, five tilt angles shown in FIG. 3 are set. That is, the first tilt angle is a tilt angle at which the leg rest 10 is suspended and stored on the leg base 4 side as indicated by reference numeral 10 in FIG. The first tilt angle is achieved by the latch pin 27 engaging with the first latch groove 25A of the latch shaft 22 as shown in FIG.
[0033]
The second tilt angle is an angle indicated by reference numeral 10A in FIG. 3, the third tilt angle is an angle indicated by reference numeral 10B in FIG. 3, and the fourth tilt angle is an angle indicated by reference numeral 10C in FIG. Further, the fifth tilt angle is an angle indicated by reference numeral 10D in FIG. The second to fifth tilt angles are achieved by the latch pin 27 engaging with the second latch groove 25B to the fifth latch groove 25E of the latch shaft 22, respectively.
[0034]
Here, for example, the operation when the legrest 10 is rotated upward from the state (stored posture) set to the first tilt angle and set to any one of the second to fifth tilt angles will be described. To do.
[0035]
First, the operator pulls up the operation lever 16 provided on the side portion of the legrest 10 to pull the first tilt angle (that is, the latch pin 27 is engaged with the first latch groove 25A). ) Is turned upward. As the leg rest 10 pivots upward, the pivotal displacement is transmitted to the latch shaft 22 through the connecting arm 23 as a pulling force toward the seat front side. Accordingly, the latch pin 27 is detached from the first latch groove 25A as the latch shaft 22 moves forward of the seat, and the upper surface of the latch shaft 22 is located on the second to fifth latch grooves 25B to 25E side. Move relative to. In this case, the stop lever 33 is rotated counterclockwise against the urging force of the second spring 42 to allow the latch pin 27 to move.
[0036]
The latch pin 27 sequentially engages and disengages with respect to the second latch groove 25B to the fourth latch groove 25D in conjunction with the upward rotation operation of the leg rest 10, and finally the first Engage with 5 latch grooves 25E. Therefore, when the operator stops the turning operation of the legrest 10 at a desired tilt angle, the latch pin 27 is engaged with the latch groove corresponding to the current time point or the latch groove immediately before the corresponding time, and the The legrest 10 is set to the tilt angle and the posture is maintained.
[0037]
On the other hand, for example, when changing the tilt angle of the legrest 10 from the fourth tilt angle to the second tilt angle, first, the operator once operates the operation lever 16 to move the legrest 10. The fourth tilt angle is pulled upward by a predetermined amount further than the fifth tilt angle. Then, as shown in FIG. 7, the latch pin 27 is positioned on the protruding portion 26 of the latch shaft 22 and the position thereof is held by the stop lever 33. Accordingly, in this state, the latch shaft 22 is in a freely movable state, and therefore the operator tilts the leg rest 10 at a stroke to the first tilt angle. When the legrest 10 is set to the first tilt angle, the stop lever 33 is rotated counterclockwise by the connecting pin 24 as shown in FIG. The restricting action of the latch pin 27 is released, and the latch pin 27 can enter the latch grooves 25 </ b> A to 25 </ b> E as the leg rest 10 is pulled up. Therefore, after that, when the operator pulls up the legrest 10 to the second tilt angle, the legrest 10 is set and held at the second tilt angle.
[0038]
Furthermore, the legrest 10 may be forcibly set from the second to fifth tilt angles to the first tilt angle independently of the normal operation as described above. That is, the sheet Z is rotated. In such a case, it is necessary to store the legrest 10 on the side of the footrest 4 and minimize the turning radius of the entire rotating portion.
[0039]
The operation in this case is performed by the operator depressing the unlocking pedal 5 provided on the side of the leg base 4. That is, when the unlocking pedal 5 is depressed, the cable 8 connected to the unlocking pedal 5 is pulled. Upon receiving the tensile force of the cable 8, the second swing lever 32 is moved as shown in FIG. The latch pin 27 is rotated clockwise around the pivot shaft 34, the latch pin 27 is pulled up against the urging force of the first spring 41, and the engagement with the latch grooves 25A to 25E of the latch shaft 22 is released. The Then, due to the weight of the legrest 10, the legrest 10 is automatically set to the first tilting angle regardless of the tilting angle.
[0040]
It is to be noted that the rotation restriction mechanism (not shown) of the seat Z is interlocked with the depression operation of the unlocking pedal 5 and the reclining restriction mechanism (not shown) for restricting the reclining of the seat back 2 of the seat Z. The locked state is also released at the same time, and the seat back 2 is brought to the foremost leaning posture and the rotation operation of the seat Z is allowed.
[0041]
As described above, according to the legrest device X according to this embodiment, the adjustment of the tilt angle of the legrest 10 and the maintenance of the tilt angle are performed by the latch shaft 22 and the plurality of latch shafts 22 provided on the latch shaft 22. The latch mechanism 20 is provided with a latch pin 27 which is selectively engaged with the latch grooves 25A to 25E, and the displacement of the latch shaft 20 in the axial direction of the latch shaft 22 is tilted to the leg rest 10 at its tilt angle. Therefore, the load applied to the legrest 10 is transmitted as the axial force to the latch shaft 22 via the connecting arm 23, and this axial force is Supported by engagement of latch grooves 25A to 25E of the latch shaft 22 and latch pins 27 engaged with the latch grooves 25A to 25E. It is intended to be.
[0042]
Therefore, the allowable support force on the latch shaft 22 side can be easily increased by increasing the diameter of the latch pin 27. In addition, the diameter dimension of the latch pin 27 is increased because the latch mechanism 20 is not at the side end of the seat cushion 1 where the hinge between the seat cushion 1 and the leg rest 10 is disposed, but at the center in the width direction from the side end. Since it is arranged at the offset position, the design freedom of the seat Z is not hindered to secure the arrangement space. As a result, it is possible to achieve both improvement in the commercial value of the seat Z by enhancing the design of the seat Z and improvement in the reliability and durability of the legrest 10.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a seat provided with a legrest device of the present invention.
FIG. 2 is a plan view of a seat cushion portion in the seat shown in FIG.
3 is a view taken in the direction of arrows III-III in FIG. 2;
4 is a perspective view of the legrest support mechanism shown in FIG. 2 from the direction of arrow IV in FIG.
5 is a perspective view of the legrest support mechanism shown in FIG. 2 from the direction of arrow V in FIG.
FIG. 6 is an explanatory diagram of a latch mechanism in the legrest support mechanism.
FIG. 7 is an explanatory diagram of a latch mechanism in the legrest support mechanism.
FIG. 8 is an explanatory diagram of a latch mechanism in the legrest support mechanism.
[Explanation of symbols]
1 is a seat cushion, 2 is a seat back, 3 is an armrest, 4 is a footrest, 5 is an unlocking pedal, 6 is a seat cushion, 7 is a connecting bracket, 8 is a cable, 10 is a legrest, 11 is a legrest frame, 12 is a connection bracket, 13 is a connection pin, 14 is a support arm, 15 is a pivot shaft, 16 is an operation lever, 17 is a shaft guide, 18 is a concave groove, 19 is a shaft insertion hole, 20 is a latch mechanism, 21 is Support frame, 22 is a latch shaft, 23 is a connection arm, 24 is a connection pin, 25A to 25B are latch grooves, 26 is a protrusion, 27 is a latch pin, 28 is a long groove, 29 is an arc groove, 31 is a first swing lever , 32 is a second swing lever, 33 is a stop lever, 34 is a pivot shaft, 35 is a pivot pin, 41 is a first spring, 42 is a second spring, and Z is a seat. X is a leg rest apparatus.

Claims (1)

A legrest device for a seat, in which a legrest is attached to a front end portion of a seat cushion so as to be tiltable up and down,
A plurality of notch-shaped latch grooves are formed in the seat cushion at appropriate intervals in the axial direction, and the latch shaft that is movable in the axial direction and the plurality of latch grooves of the latch shaft are selected. A latch mechanism that includes a latch pin that is capable of being engaged and that restricts movement of the latch shaft at a movement position corresponding to a position where the latch groove is formed on the latch shaft. While arranged at a position closer to the center in the width direction than the end and with the axial direction of the latch shaft directed in the front-rear direction of the seat cushion,
The latch shaft and the leg rest are connected by a connecting arm, and the axial displacement of the latch shaft can be transmitted to the leg rest as a change in the tilt angle via the connecting arm .
A first rotation position that operates in accordance with the movement position of the latch shaft 22 and allows the latch pin to be engaged and disengaged from the latch grooves, and the latch pin is the latch groove at the end of the latch shaft. A second rotation position for holding the latch pin in a non-engaged state with the latch shaft in a state of being positioned closer to the rear end, and a state of the latch shaft in a state of holding the latch pin in the second rotation position When the latch pin moves in the backward direction and reaches the vicinity of the latch groove at the foremost end, the latch pin is alternatively set at the third rotational position that allows the latch pin to be engaged with the latch groove at the foremost end. A leg rest device for a seat, comprising a stop lever .

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